Merge pull request #902 from jackjackbits/refactor/transport-abstraction

Refactor MessageRouter to use generic Transport abstraction

.gitattributes

@@ -0,0 +1,20 @@
+# Prevent Github Languages stats skewing:
+
+# Binaries and assets
+**/*.xcframework/** linguist-vendored
+**/*.xcassets/** linguist-vendored
+
+# Generated files
+**/*.pbxproj linguist-generated
+**/*.storyboard linguist-generated
+Package.resolved linguist-generated
+
+# Downloaded CSVs
+relays/online_relays_gps.csv linguist-vendored
+
+# Docs
+**/*.md linguist-documentation
+
+# Configs
+Configs/*.xcconfig linguist-documentation
+**/*.plist linguist-documentation

.github/workflows/fetch_georelays.yml

@@ -0,0 +1,71 @@
+name: Fetch GeoRelays Data
+
+on:
+  schedule:
+    - cron: '0 6 * * 0'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-relay-data:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+
+      - name: Fetch GeoRelays
+        run: |
+          wget -q https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv
+          mv nostr_relays.csv ./relays/online_relays_gps.csv
+
+      - name: Configure git
+        run: |
+          git config user.email "action@github.com"
+          git config user.name "GitHub Action"
+
+      - name: Create update branch if changes
+        id: create_branch
+        run: |
+          # exit early if no changes
+          if git diff --quiet --relays/online_relays_gps.csv; then
+            echo "changed=false" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+
+          # branch name with timestamp
+          BRANCH="update-georelays-$(date -u +%Y%m%dT%H%M%SZ)"
+          git checkout -b "$BRANCH"
+
+          git add relays/online_relays_gps.csv
+          git commit -m "Automated update of relay data - $(date -u --rfc-3339=seconds)"
+          echo "changed=true" >> $GITHUB_OUTPUT
+          echo "branch=$BRANCH" >> $GITHUB_OUTPUT
+
+      - name: Push branch
+        if: steps.create_branch.outputs.changed == 'true'
+        run: |
+          git push --set-upstream origin "${{ steps.create_branch.outputs.branch }}"
+
+      - name: Create pull request
+        if: steps.create_branch.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Automated update of relay data
+          branch: ${{ steps.create_branch.outputs.branch }}
+          base: main
+          title: Automated update of relay data
+          body: |
+            This PR was created automatically by the scheduled workflow. It updates relays/online_relays_gps.csv from the GeoRelays source.
+          labels: automated, georelays
+
+      - name: No changes
+        if: steps.create_branch.outputs.changed != 'true'
+        run: echo "No changes to relays/online_relays_gps.csv"

.github/workflows/swift-tests.yml

@@ -0,0 +1,27 @@
+name: Build & Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Run Swift Tests
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up Swift
+        uses: swift-actions/setup-swift@v2
+
+      - name: Build the package
+        run: swift build
+
+      - name: Run Tests
+        run: swift test --parallel

.gitignore

@@ -5,8 +5,9 @@
 ## implementation plans
 plans/
 
-## User settings
-xcuserdata/
+## AI
+CLAUDE.md
+AGENTS.md
 
 ## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
 *.xcscmblueprint
@@ -15,6 +16,7 @@ xcuserdata/
 ## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
 build/
 DerivedData/
+.DerivedData/
 *.moved-aside
 *.pbxuser
 !default.pbxuser
@@ -52,7 +54,8 @@ iOSInjectionProject/
 
 ## Xcode project
 *.xcodeproj/project.xcworkspace/
-*.xcodeproj/xcshareddata/
+## Xcode User settings
+xcuserdata/
 
 ## Python
 __pycache__/
@@ -62,3 +65,17 @@ __pycache__/
 ## Temporary files
 *.tmp
 *.temp
+
+## Cache
+.cache/
+
+# Local build results
+.Result*/
+.Result*.xcresult/
+TestResult.xcresult/
+*.xcresult/
+build.log
+*.log
+
+# Local configs
+Local.xcconfig

AI_CONTEXT.md

@@ -1,472 +0,0 @@
-# AI Context for BitChat
-
-This document provides essential context for AI assistants working on the BitChat codebase. Read this first to understand the project's architecture, design decisions, and key concepts.
-
-## Project Overview
-
-BitChat is a decentralized, peer-to-peer messaging application that works over Bluetooth mesh networks without requiring internet connectivity, servers, or phone numbers. It's designed for scenarios where traditional communication infrastructure is unavailable or untrusted.
-
-### Key Features
-- **Bluetooth Mesh Networking**: Multi-hop message relay over BLE
-- **Privacy-First Design**: No accounts, no persistent identifiers
-- **End-to-End Encryption**: Uses Noise Protocol Framework for private messages
-- **Store & Forward**: Messages cached for offline peers
-- **IRC-Style Commands**: Familiar `/msg`, `/who` interface
-- **Cross-Platform**: Native iOS and macOS support
-- **Nostr Integration**: Seamless fallback for mutual favorites when out of Bluetooth range
-- **Hybrid Transport**: Automatic switching between Bluetooth and Nostr
-
-## Architecture Overview
-
-```
-┌─────────────────────────────────────────────────────────────────┐
-│                        User Interface                             │
-│                    (ContentView, ChatViewModel)                   │
-└─────────────────────────────────────────────────────────────────┘
-                                   │
-┌─────────────────────────────────────────────────────────────────┐
-│                     Application Services                          │
-│  (MessageRetryService, DeliveryTracker, NotificationService)     │
-└─────────────────────────────────────────────────────────────────┘
-                                   │
-┌─────────────────────────────────────────────────────────────────┐
-│                      Message Router                               │
-│         (Transport selection, Favorites integration)              │
-└─────────────────────────────────────────────────────────────────┘
-                    │                            │
-┌───────────────────────────────┐ ┌────────────────────────────────┐
-│        Security Layer         │ │      Nostr Protocol Layer      │
-│ (NoiseEncryptionService,      │ │  (NostrProtocol, NIP-17,      │
-│  SecureIdentityStateManager)  │ │   NostrRelayManager)          │
-└───────────────────────────────┘ └────────────────────────────────┘
-                    │                            │
-┌───────────────────────────────┐ ┌────────────────────────────────┐
-│       Protocol Layer          │ │         Transport              │
-│ (BitchatProtocol, Binary-     │ │    (WebSocket to Nostr        │
-│  Protocol, NoiseProtocol)     │ │      relay servers)           │
-└───────────────────────────────┘ └────────────────────────────────┘
-                    │
-┌─────────────────────────────────────────────────────────────────┐
-│                   Bluetooth Transport Layer                       │
-│                   (BluetoothMeshService)                          │
-└─────────────────────────────────────────────────────────────────┘
-```
-
-## Core Components
-
-### 1. BluetoothMeshService (Transport Layer)
-- **Location**: `bitchat/Services/BluetoothMeshService.swift`
-- **Purpose**: Manages BLE connections and implements mesh networking
-- **Key Responsibilities**:
-  - Peer discovery (scanning and advertising simultaneously)
-  - Connection management (acts as both central and peripheral)
-  - Message routing and relay
-  - Version negotiation with peers
-  - Automatic reconnection and topology management
-
-### 2. BitchatProtocol (Protocol Layer)
-- **Location**: `bitchat/Protocols/BitchatProtocol.swift`
-- **Purpose**: Defines the application-level messaging protocol
-- **Key Features**:
-  - Binary packet format for efficiency
-  - Message types: Chat, Announcement, PrivateMessage, etc.
-  - TTL-based routing (max 7 hops)
-  - Message deduplication via unique IDs
-  - Privacy features: padding, timing obfuscation
-
-### 3. NoiseProtocol Implementation
-- **Locations**: 
-  - `bitchat/Noise/NoiseProtocol.swift` - Core protocol implementation
-  - `bitchat/Noise/NoiseSession.swift` - Session management
-  - `bitchat/Services/NoiseEncryptionService.swift` - High-level encryption API
-- **Purpose**: Provides end-to-end encryption for private messages
-- **Implementation Details**:
-  - Uses Noise_XX_25519_AESGCM_SHA256 pattern
-  - Mutual authentication via static keys
-  - Forward secrecy via ephemeral keys
-  - Integrated with identity management
-
-### 4. Identity System
-- **Location**: `bitchat/Identity/`
-- **Three-Layer Model**:
-  1. **Ephemeral Identity**: Short-lived, rotates frequently
-  2. **Cryptographic Identity**: Long-term Noise static keypair
-  3. **Social Identity**: User-chosen nickname and metadata
-- **Trust Levels**: Untrusted → Verified → Trusted → Blocked
-
-### 5. ChatViewModel
-- **Location**: `bitchat/ViewModels/ChatViewModel.swift`
-- **Purpose**: Central state management and business logic
-- **Responsibilities**:
-  - Message handling and batching
-  - Command processing (/msg, /who, etc.)
-  - UI state management
-  - Private chat coordination
-
-### 6. Nostr Integration
-- **Locations**:
-  - `bitchat/Nostr/NostrProtocol.swift` - NIP-17 private message implementation
-  - `bitchat/Nostr/NostrRelayManager.swift` - WebSocket relay connections
-  - `bitchat/Nostr/NostrIdentity.swift` - Nostr key management
-  - `bitchat/Services/MessageRouter.swift` - Transport selection logic
-- **Purpose**: Enables communication with mutual favorites when out of Bluetooth range
-- **Key Features**:
-  - NIP-17 gift-wrapped private messages for metadata privacy
-  - Automatic relay connection management
-  - Seamless transport switching between Bluetooth and Nostr
-  - Integrated with favorites system for mutual authentication
-
-### 7. MessageRouter
-- **Location**: `bitchat/Services/MessageRouter.swift`
-- **Purpose**: Intelligent routing between Bluetooth mesh and Nostr transports
-- **Transport Selection Logic**:
-  1. Always prefer Bluetooth mesh when peer is connected
-  2. Use Nostr for mutual favorites when peer is offline
-  3. Fail gracefully when no transport is available
-- **Message Types Routed**:
-  - Regular chat messages
-  - Favorite/unfavorite notifications
-  - Delivery acknowledgments
-  - Read receipts
-
-## Key Design Decisions
-
-### 1. Protocol Design
-- **Binary Protocol**: Chosen for efficiency over BLE's limited bandwidth
-- **No JSON**: Reduces parsing overhead and message size
-- **Custom Framing**: Handles BLE's 512-byte MTU limitations
-
-### 2. Security Architecture
-- **Noise Protocol**: Industry-standard, well-analyzed framework
-- **XX Pattern**: Provides mutual authentication and forward secrecy
-- **No Long-Term Identifiers**: Enhances privacy and deniability
-
-### 3. Mesh Networking
-- **Store & Forward**: Essential for intermittent connectivity
-- **TTL-Based Routing**: Prevents infinite loops in mesh
-- **Bloom Filters**: Efficient duplicate detection
-
-### 4. Privacy Features
-- **Message Padding**: Obscures message length
-- **Cover Traffic**: Optional dummy messages
-- **Timing Obfuscation**: Randomized delays
-- **Emergency Wipe**: Triple-tap to clear all data
-
-### 5. Nostr Integration
-- **NIP-17 Gift Wraps**: Maximum metadata privacy
-- **Ephemeral Keys**: Each message uses unique ephemeral keys
-- **Mutual Favorites Only**: Requires bidirectional trust
-- **Transport Abstraction**: Users don't need to know about Nostr
-
-## Code Organization
-
-### Services (`/bitchat/Services/`)
-Application-level services that coordinate between layers:
-- `BluetoothMeshService`: Core networking
-- `NoiseEncryptionService`: Encryption coordination
-- `MessageRetryService`: Reliability layer
-- `DeliveryTracker`: Acknowledgment handling
-- `NotificationService`: System notifications
-
-### Protocols (`/bitchat/Protocols/`)
-Protocol definitions and implementations:
-- `BitchatProtocol`: Application protocol
-- `BinaryProtocol`: Low-level encoding
-- `BinaryEncodingUtils`: Helper functions
-
-### Noise (`/bitchat/Noise/`)
-Noise Protocol Framework implementation:
-- `NoiseProtocol`: Core cryptographic operations
-- `NoiseSession`: Session state management
-- `NoiseHandshakeCoordinator`: Handshake orchestration
-- `NoiseSecurityConsiderations`: Security validations
-
-### Views & ViewModels
-MVVM architecture for UI:
-- `ContentView`: Main chat interface
-- `ChatViewModel`: Business logic and state
-- Supporting views for settings, identity, etc.
-
-## Nostr Protocol Implementation
-
-### Overview
-BitChat integrates Nostr as a secondary transport for communicating with mutual favorites when Bluetooth connectivity is unavailable. This integration is transparent to users - messages automatically route through Nostr when needed.
-
-### NIP-17 Private Direct Messages
-BitChat implements NIP-17 (Private Direct Messages) for metadata-private communication:
-
-1. **Gift Wrap Structure**:
-   ```
-   Gift Wrap (kind 1059) → Seal (kind 13) → Rumor (kind 1)
-   ```
-   - **Rumor**: The actual message content (unsigned)
-   - **Seal**: Encrypted rumor, hides sender identity
-   - **Gift Wrap**: Double-encrypted, tagged for recipient
-
-2. **Ephemeral Keys**:
-   - Each message uses TWO ephemeral key pairs
-   - Seal uses one ephemeral key
-   - Gift wrap uses a different ephemeral key
-   - Provides sender anonymity and forward secrecy
-
-3. **Timestamp Randomization**:
-   - ±1 minute randomization (reduced from NIP-17's ±15 minutes)
-   - Prevents timing correlation attacks
-   - Configurable in `NostrProtocol.randomizedTimestamp()`
-
-### Favorites Integration
-
-The Nostr transport is only available for mutual favorites:
-
-1. **Favorite Establishment**:
-   - User favorites a peer via `/fav` command
-   - Favorite notification sent via Bluetooth (if connected)
-   - Peer's Nostr public key exchanged during favorite process
-   - Stored in `FavoritesPersistenceService`
-
-2. **Mutual Requirement**:
-   - Both peers must favorite each other
-   - Prevents spam and unwanted Nostr messages
-   - Enforced by `MessageRouter` transport selection
-
-3. **Nostr Key Management**:
-   - Derived from Noise static key using BIP-32
-   - Path: `m/44'/1237'/0'/0/0` (1237 = "NOSTR" in decimal)
-   - Consistent npub across app reinstalls
-   - Keys never leave the device
-
-### Message Routing Logic
-
-`MessageRouter` automatically selects transport:
-
-```swift
-if peerAvailableOnMesh {
-    transport = .bluetoothMesh  // Always prefer mesh
-} else if isMutualFavorite {
-    transport = .nostr          // Use Nostr for offline favorites
-} else {
-    throw MessageRouterError.peerNotReachable
-}
-```
-
-### Relay Configuration
-
-Default relays (hardcoded for reliability):
-- `wss://relay.damus.io`
-- `wss://relay.primal.net`
-- `wss://offchain.pub`
-- `wss://nostr21.com`
-
-Relay selection criteria:
-- Geographic distribution
-- High uptime
-- No authentication required
-- Support for ephemeral events
-
-### Message Format
-
-Structured content for different message types:
-- Chat: `MSG:<messageID>:<content>`
-- Favorite: `FAVORITED:<senderNpub>` or `UNFAVORITED:<senderNpub>`
-- Delivery ACK: `DELIVERED:<messageID>`
-- Read Receipt: `READ:<base64EncodedReceipt>`
-
-### Implementation Details
-
-1. **NostrRelayManager**:
-   - Manages WebSocket connections to relays
-   - Handles reconnection logic
-   - Processes EVENT, EOSE, OK, NOTICE messages
-   - Implements NIP-01 relay protocol
-
-2. **NostrProtocol**:
-   - Implements NIP-17 encryption/decryption
-   - Handles gift wrap creation/unwrapping
-   - Manages ephemeral key generation
-   - Provides Schnorr signatures
-
-3. **ProcessedMessagesService**:
-   - Prevents duplicate message processing
-   - Tracks last subscription timestamp
-   - Persists across app launches
-   - 30-day retention window
-
-### Security Considerations
-
-1. **Metadata Protection**:
-   - Sender identity hidden via ephemeral keys
-   - Recipient only visible in gift wrap p-tag
-   - Timing correlation prevented via randomization
-   - Message content double-encrypted
-
-2. **Relay Trust**:
-   - Relays cannot read message content
-   - Relays can see recipient pubkey (gift wrap)
-   - Relays cannot determine sender
-   - Multiple relays used for redundancy
-
-3. **Key Hygiene**:
-   - Ephemeral keys used once and discarded
-   - Static Nostr key derived from Noise key
-   - No key reuse between messages
-   - Keys cleared from memory after use
-
-### Debugging Nostr Issues
-
-1. **Check relay connections**:
-   - Look for "Connected to Nostr relay" in logs
-   - Verify WebSocket state in NostrRelayManager
-   - Check for relay errors/notices
-
-2. **Verify gift wrap creation**:
-   - Enable debug logging in NostrProtocol
-   - Check ephemeral key generation
-   - Verify encryption steps
-
-3. **Message delivery**:
-   - Check ProcessedMessagesService for duplicates
-   - Verify subscription filters
-   - Look for EVENT messages in relay responses
-
-## Development Guidelines
-
-### 1. Security First
-- Never log sensitive data (keys, message content)
-- Use `SecureLogger` for security-aware logging
-- Validate all inputs from network
-- Follow principle of least privilege
-
-### 2. Performance Considerations
-- BLE has limited bandwidth (~20KB/s practical)
-- Minimize protocol overhead
-- Batch operations where possible
-- Use compression for large messages
-
-### 3. Testing
-- Unit tests for protocol logic
-- Integration tests for service interactions
-- End-to-end tests for user flows
-- Mock objects for BLE testing
-
-### 4. Error Handling
-- Graceful degradation for network issues
-- Clear error messages for users
-- Automatic retry with backoff
-- Never expose internal errors
-
-## Common Tasks
-
-### Adding a New Message Type
-1. Define in `MessageType` enum in `BitchatProtocol.swift`
-2. Implement encoding/decoding logic
-3. Add handling in `ChatViewModel`
-4. Update UI if needed
-5. Add tests
-
-### Implementing a New Command
-1. Add to `ChatViewModel.processCommand()`
-2. Define any new message types needed
-3. Implement command logic
-4. Add autocomplete support
-5. Update help text
-
-### Debugging Bluetooth Issues
-1. Check `BluetoothMeshService` logs
-2. Verify peer states and connections
-3. Monitor characteristic updates
-4. Use Bluetooth debugging tools
-
-### Working with Nostr Transport
-1. Verify mutual favorite status in `FavoritesPersistenceService`
-2. Check Nostr key derivation in `NostrIdentity`
-3. Monitor relay connections in `NostrRelayManager`
-4. Test gift wrap encryption/decryption
-5. Verify transport selection in `MessageRouter`
-
-### Adding Nostr Features
-1. Understand NIP-17 gift wrap structure
-2. Maintain ephemeral key hygiene
-3. Test with multiple relays
-4. Preserve metadata privacy
-5. Handle relay disconnections gracefully
-
-## Security Threat Model
-
-### Assumptions
-- Adversaries can intercept all Bluetooth traffic
-- Devices may be compromised
-- No trusted infrastructure available
-
-### Protections
-- End-to-end encryption for private messages
-- Message authentication via HMAC
-- Forward secrecy via ephemeral keys
-- Deniability through lack of signatures
-
-### Limitations
-- Public messages are unencrypted by design
-- Metadata (who talks to whom) partially visible
-- Timing attacks possible on mesh network
-- No protection against flooding/spam (yet)
-
-## Performance Optimizations
-
-### Implemented
-- LZ4 compression for messages
-- Adaptive duty cycling for battery
-- Connection caching and reuse
-- Bloom filters for deduplication
-
-### Future Improvements
-- Protocol buffer encoding
-- Better mesh routing algorithms
-- Predictive pre-connection
-- Smarter retransmission
-
-## Troubleshooting Guide
-
-### Common Issues
-1. **Peers not discovering**: Check Bluetooth permissions, ensure app is in foreground
-2. **Messages not delivering**: Verify mesh connectivity, check TTL values
-3. **Handshake failures**: Ensure identity state is consistent, check key storage
-4. **Performance issues**: Monitor connection count, check for message loops
-
-## External Dependencies
-
-### Swift Packages
-- CryptoKit: Apple's crypto framework
-- Network.framework: For future internet support
-- No third-party dependencies (by design)
-
-### System Requirements
-- iOS 14.0+ / macOS 11.0+
-- Bluetooth LE hardware
-- ~50MB storage for app + data
-
-## Future Roadmap
-
-### Planned Features
-- Internet bridging for hybrid networks
-- Group chat with forward secrecy
-- Voice messages with Opus codec
-- File transfer support
-
-### Architecture Evolution
-- Plugin system for transports
-- Modular protocol stack
-- Cross-platform core library
-- Federation between networks
-
----
-
-## Quick Start for AI Assistants
-
-1. **Understand the layers**: Transport → Protocol → Security → Services → UI
-2. **Follow the data flow**: BLE/Nostr → Binary/JSON → Protocol → ViewModel → View
-3. **Respect security boundaries**: Never mix trusted and untrusted data
-4. **Test thoroughly**: This is critical infrastructure for users
-5. **Ask about design decisions**: Many choices have non-obvious reasons
-6. **Dual Transport**: Remember that messages can flow over Bluetooth OR Nostr
-7. **Favorites System**: Nostr only works between mutual favorites
-
-When in doubt, prioritize security and privacy over features. BitChat users depend on this app in situations where traditional communication has failed them.

BRING_THE_NOISE.md

@@ -37,7 +37,7 @@ This three-message pattern provides:
 #### NoiseEncryptionService
 The main service managing all Noise operations:
 ```swift
-class NoiseEncryptionService {
+final class NoiseEncryptionService {
     private let staticIdentityKey: Curve25519.KeyAgreement.PrivateKey
     private let sessionManager: NoiseSessionManager
     private let channelEncryption = NoiseChannelEncryption()
@@ -47,7 +47,7 @@ class NoiseEncryptionService {
 #### NoiseSession
 Individual session state for each peer:
 ```swift
-class NoiseSession {
+final class NoiseSession {
     private var handshakeState: NoiseHandshakeState?
     private var sendCipher: NoiseCipherState?
     private var receiveCipher: NoiseCipherState?
@@ -58,7 +58,7 @@ class NoiseSession {
 #### NoiseSessionManager
 Thread-safe session management:
 ```swift
-class NoiseSessionManager {
+final class NoiseSessionManager {
     private var sessions: [String: NoiseSession] = [:]
     private let sessionsQueue = DispatchQueue(label: "noise.sessions", attributes: .concurrent)
 }

Configs/Debug.xcconfig

@@ -0,0 +1,4 @@
+#include "Release.xcconfig"
+
+// Optional include of local configs
+#include? "Local.xcconfig"

Configs/Local.xcconfig.example

@@ -0,0 +1,5 @@
+// Your Apple Developer Team ID - https://stackoverflow.com/a/18727947
+DEVELOPMENT_TEAM = ABC123
+
+// Unique bundle id to be able to register and run locally
+PRODUCT_BUNDLE_IDENTIFIER = chat.bitchat.$(DEVELOPMENT_TEAM)

Configs/Release.xcconfig

@@ -0,0 +1,11 @@
+MARKETING_VERSION = 1.5.0
+CURRENT_PROJECT_VERSION = 1
+
+IPHONEOS_DEPLOYMENT_TARGET = 16.0
+MACOSX_DEPLOYMENT_TARGET = 13.0
+SWIFT_VERSION = 5.0
+
+DEVELOPMENT_TEAM = L3N5LHJD5Y
+CODE_SIGN_STYLE = Automatic
+
+PRODUCT_BUNDLE_IDENTIFIER = chat.bitchat

Justfile

@@ -14,16 +14,16 @@ default:
 # Check prerequisites
 check:
     @echo "Checking prerequisites..."
-    @command -v xcodegen >/dev/null 2>&1 || (echo "❌ XcodeGen not found. Install with: brew install xcodegen" && exit 1)
-    @command -v xcodebuild >/dev/null 2>&1 || (echo "❌ Xcode not found. Install Xcode from App Store" && exit 1)
-    @security find-identity -v -p codesigning | grep -q "Developer ID" || (echo "⚠️  No Developer ID found - code signing may fail" && exit 0)
+    @command -v xcodebuild >/dev/null 2>&1 || (echo "❌ xcodebuild not found. Install Xcode from App Store" && exit 1)
+    @xcode-select -p | grep -q "Xcode.app" || (echo "❌ Full Xcode required, not just command line tools. Install from App Store and run:\n   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer" && exit 1)
+    @test -d "/Applications/Xcode.app" || (echo "❌ Xcode.app not found in Applications folder. Install from App Store" && exit 1)
+    @xcodebuild -version >/dev/null 2>&1 || (echo "❌ Xcode not properly configured. Try:\n   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer" && exit 1)
+    @security find-identity -v -p codesigning | grep -q "Apple Development\|Developer ID" || (echo "⚠️  No Developer ID found - code signing may fail" && exit 0)
     @echo "✅ All prerequisites met"
 
 # Backup original files
 backup:
     @echo "Backing up original project configuration..."
-    @cp project.yml project.yml.backup 2>/dev/null || true
-    @# Backup other files that get modified by xcodegen
     @if [ -f bitchat.xcodeproj/project.pbxproj ]; then cp bitchat.xcodeproj/project.pbxproj bitchat.xcodeproj/project.pbxproj.backup; fi
     @if [ -f bitchat/Info.plist ]; then cp bitchat/Info.plist bitchat/Info.plist.backup; fi
 
@@ -44,20 +44,15 @@ patch-for-macos: backup
     @# Move iOS-specific files out of the way temporarily
     @if [ -f bitchat/LaunchScreen.storyboard ]; then mv bitchat/LaunchScreen.storyboard bitchat/LaunchScreen.storyboard.ios; fi
 
-# Generate Xcode project with patches
-generate: patch-for-macos
-    @echo "Generating Xcode project..."
-    @xcodegen generate
-
 # Build the macOS app
-build: check generate
+build: #check generate
     @echo "Building BitChat for macOS..."
     @xcodebuild -project bitchat.xcodeproj -scheme "bitchat (macOS)" -configuration Debug CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO CODE_SIGN_ENTITLEMENTS="" build
 
 # Run the macOS app
 run: build
     @echo "Launching BitChat..."
-    @find ~/Library/Developer/Xcode/DerivedData -name "bitchat.app" -path "*/Debug/*" | head -1 | xargs -I {} open "{}"
+    @find ~/Library/Developer/Xcode/DerivedData -name "bitchat.app" -path "*/Debug/*" -not -path "*/Index.noindex/*" | head -1 | xargs -I {} open "{}"
 
 # Clean build artifacts and restore original files
 clean: restore
@@ -75,10 +70,8 @@ clean: restore
 # Quick run without cleaning (for development)
 dev-run: check
     @echo "Quick development build..."
-    @if [ ! -f project.yml.backup ]; then just patch-for-macos; fi
-    @xcodegen generate
-    @xcodebuild -project bitchat.xcodeproj -scheme "bitchat (macOS)" -configuration Debug CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO CODE_SIGN_ENTITLEMENTS="" build
-    @find ~/Library/Developer/Xcode/DerivedData -name "bitchat.app" -path "*/Debug/*" | head -1 | xargs -I {} open "{}"
+    @xcodebuild -project bitchat.xcodeproj -scheme "bitchat_macOS" -configuration Debug CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO CODE_SIGN_ENTITLEMENTS="" build
+    @find ~/Library/Developer/Xcode/DerivedData -name "bitchat.app" -path "*/Debug/*" -not -path "*/Index.noindex/*" | head -1 | xargs -I {} open "{}"
 
 # Show app info
 info:
@@ -106,11 +99,9 @@ nuke:
     @echo "🧨 Nuclear clean - removing all build artifacts and backups..."
     @rm -rf ~/Library/Developer/Xcode/DerivedData/bitchat-* 2>/dev/null || true
     @rm -rf bitchat.xcodeproj 2>/dev/null || true
-    @rm -f project.yml.backup 2>/dev/null || true
-    @rm -f project-macos.yml 2>/dev/null || true
     @rm -f bitchat.xcodeproj/project.pbxproj.backup 2>/dev/null || true
     @rm -f bitchat/Info.plist.backup 2>/dev/null || true
     @# Restore iOS-specific files if they were moved
     @if [ -f bitchat/LaunchScreen.storyboard.ios ]; then mv bitchat/LaunchScreen.storyboard.ios bitchat/LaunchScreen.storyboard; fi
-    @git checkout -- project.yml bitchat.xcodeproj/project.pbxproj bitchat/Info.plist 2>/dev/null || echo "⚠️  Not a git repo or no changes to restore"
+    @git checkout bitchat.xcodeproj/project.pbxproj bitchat/Info.plist 2>/dev/null || echo "⚠️  Not a git repo or no changes to restore"
     @echo "✅ Nuclear clean complete"

Package.resolved

@@ -0,0 +1,14 @@
+{
+  "pins" : [
+    {
+      "identity" : "swift-secp256k1",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/21-DOT-DEV/swift-secp256k1",
+      "state" : {
+        "revision" : "8c62aba8a3011c9bcea232e5ee007fb0b34a15e2",
+        "version" : "0.21.1"
+      }
+    }
+  ],
+  "version" : 2
+}

Package.swift

@@ -4,6 +4,7 @@ import PackageDescription
 
 let package = Package(
     name: "bitchat",
+    defaultLocalization: "en",
     platforms: [
         .iOS(.v16),
         .macOS(.v13)
@@ -14,17 +15,44 @@ let package = Package(
             targets: ["bitchat"]
         ),
     ],
+    dependencies:[
+        .package(path: "localPackages/Tor"),
+        .package(path: "localPackages/BitLogger"),
+        .package(url: "https://github.com/21-DOT-DEV/swift-secp256k1", exact: "0.21.1")
+    ],
     targets: [
         .executableTarget(
             name: "bitchat",
+            dependencies: [
+                .product(name: "P256K", package: "swift-secp256k1"),
+                .product(name: "BitLogger", package: "BitLogger"),
+                .product(name: "Tor", package: "Tor")
+            ],
             path: "bitchat",
             exclude: [
                 "Info.plist",
                 "Assets.xcassets",
                 "bitchat.entitlements",
                 "bitchat-macOS.entitlements",
-                "LaunchScreen.storyboard"
+                "LaunchScreen.storyboard",
+                "ViewModels/Extensions/README.md"
+            ],
+            resources: [
+                .process("Localizable.xcstrings")
             ]
         ),
+        .testTarget(
+            name: "bitchatTests",
+            dependencies: ["bitchat"],
+            path: "bitchatTests",
+            exclude: [
+                "Info.plist",
+                "README.md"
+            ],
+            resources: [
+                .process("Localization"),
+                .process("Noise")
+            ]
+        )
     ]
-)
+)

README.md

@@ -1,90 +1,125 @@
-<img height="300" alt="bitchat" src="https://github.com/user-attachments/assets/2660f828-49c7-444d-beca-d8b01854667a" />
+<img width="256" height="256" alt="icon_128x128@2x" src="https://github.com/user-attachments/assets/90133f83-b4f6-41c6-aab9-25d0859d2a47" />
 
 ## bitchat
 
-A decentralized peer-to-peer messaging app that works over Bluetooth mesh networks. No internet required, no servers, no phone numbers. It's the side-groupchat. 
+A decentralized peer-to-peer messaging app with dual transport architecture: local Bluetooth mesh networks for offline communication and internet-based Nostr protocol for global reach. No accounts, no phone numbers, no central servers. It's the side-groupchat.
 
 [bitchat.free](http://bitchat.free)
+
 📲 [App Store](https://apps.apple.com/us/app/bitchat-mesh/id6748219622)
 
 > [!WARNING]
-> Private message and channel features have not received external security review and may contain vulnerabilities. Do not use for sensitive use cases, and do not rely on its security until it has been reviewed. Now uses the [Noise Protocol](http://www.noiseprotocol.org) for identity and encryption. Public local chat (the main feature) has no security concerns. 
-
+> Private messages have not received external security review and may contain vulnerabilities. Do not use for sensitive use cases, and do not rely on its security until it has been reviewed. Now uses the [Noise Protocol](https://www.noiseprotocol.org) for identity and encryption. Public local chat (the main feature) has no security concerns.
 
 ## License
 
 This project is released into the public domain. See the [LICENSE](LICENSE) file for details.
 
-
 ## Features
 
+- **Dual Transport Architecture**: Bluetooth mesh for offline + Nostr protocol for internet-based messaging
+- **Location-Based Channels**: Geographic chat rooms using geohash coordinates over global Nostr relays
+- **Intelligent Message Routing**: Automatically chooses best transport (Bluetooth → Nostr fallback)
 - **Decentralized Mesh Network**: Automatic peer discovery and multi-hop message relay over Bluetooth LE
 - **Privacy First**: No accounts, no phone numbers, no persistent identifiers
-- **Cover Traffic**: Timing obfuscation and dummy messages for enhanced privacy
-- **Private Message End-to-End Encryption**: [Noise Protocol](http://noiseprotocol.org)
-- **Store & Forward**: Messages cached for offline peers and delivered when they reconnect
+- **Private Message End-to-End Encryption**: [Noise Protocol](https://noiseprotocol.org) for mesh, NIP-17 for Nostr
 - **IRC-Style Commands**: Familiar `/slap`, `/msg`, `/who` style interface
 - **Universal App**: Native support for iOS and macOS
 - **Emergency Wipe**: Triple-tap to instantly clear all data
 - **Performance Optimizations**: LZ4 message compression, adaptive battery modes, and optimized networking
 
+## [Technical Architecture](https://deepwiki.com/permissionlesstech/bitchat)
 
-## Technical Architecture
+BitChat uses a **hybrid messaging architecture** with two complementary transport layers:
 
-### Binary Protocol
-bitchat uses an efficient binary protocol optimized for Bluetooth LE:
-- Compact packet format with 1-byte type field
-- TTL-based message routing (max 7 hops)
-- Automatic fragmentation for large messages
-- Message deduplication via unique IDs
+### Bluetooth Mesh Network (Offline)
 
-### Mesh Networking
-- Each device acts as both client and peripheral
-- Automatic peer discovery and connection management
-- Store-and-forward for offline message delivery
-- Adaptive duty cycling for battery optimization
+- **Local Communication**: Direct peer-to-peer within Bluetooth range
+- **Multi-hop Relay**: Messages route through nearby devices (max 7 hops)
+- **No Internet Required**: Works completely offline in disaster scenarios
+- **Noise Protocol Encryption**: End-to-end encryption with forward secrecy
+- **Binary Protocol**: Compact packet format optimized for Bluetooth LE constraints
+- **Automatic Discovery**: Peer discovery and connection management
+- **Adaptive Power**: Battery-optimized duty cycling
+
+### Nostr Protocol (Internet)
+
+- **Global Reach**: Connect with users worldwide via internet relays
+- **Location Channels**: Geographic chat rooms using geohash coordinates
+- **290+ Relay Network**: Distributed across the globe for reliability
+- **NIP-17 Encryption**: Gift-wrapped private messages for internet privacy
+- **Ephemeral Keys**: Fresh cryptographic identity per geohash area
+
+### Channel Types
+
+#### `mesh #bluetooth`
+
+- **Transport**: Bluetooth Low Energy mesh network
+- **Scope**: Local devices within multi-hop range
+- **Internet**: Not required
+- **Use Case**: Offline communication, protests, disasters, remote areas
+
+#### Location Channels (`block #dr5rsj7`, `neighborhood #dr5rs`, `country #dr`)
+
+- **Transport**: Nostr protocol over internet
+- **Scope**: Geographic areas defined by geohash precision
+  - `block` (7 chars): City block level
+  - `neighborhood` (6 chars): District/neighborhood
+  - `city` (5 chars): City level
+  - `province` (4 chars): State/province
+  - `region` (2 chars): Country/large region
+- **Internet**: Required (connects to Nostr relays)
+- **Use Case**: Location-based community chat, local events, regional discussions
+
+### Direct Message Routing
+
+Private messages use **intelligent transport selection**:
+
+1. **Bluetooth First** (preferred when available)
+
+   - Direct connection with established Noise session
+   - Fastest and most private option
+
+2. **Nostr Fallback** (when Bluetooth unavailable)
+
+   - Uses recipient's Nostr public key
+   - NIP-17 gift-wrapping for privacy
+   - Routes through global relay network
+
+3. **Smart Queuing** (when neither available)
+   - Messages queued until transport becomes available
+   - Automatic delivery when connection established
 
 For detailed protocol documentation, see the [Technical Whitepaper](WHITEPAPER.md).
 
-
 ## Setup
 
-### Option 1: Using XcodeGen (Recommended)
+### Option 1: Using Xcode
 
-1. Install XcodeGen if you haven't already:
-   ```bash
-   brew install xcodegen
-   ```
-
-2. Generate the Xcode project:
    ```bash
    cd bitchat
-   xcodegen generate
-   ```
-
-3. Open the generated project:
-   ```bash
    open bitchat.xcodeproj
    ```
 
-### Option 2: Using Swift Package Manager
+   To run on a device there're a few steps to prepare the code:
+   - Clone the local configs: `cp Configs/Local.xcconfig.example Configs/Local.xcconfig`
+   - Add your Developer Team ID into the newly created `Configs/Local.xcconfig`
+      - Bundle ID would be set to `chat.bitchat.<team_id>` (unless you set to something else)
+   - Entitlements need to be updated manually (TODO: Automate):
+      - Search and replace `group.chat.bitchat` with `group.<your_bundle_id>` (e.g. `group.chat.bitchat.ABC123`)
+
+### Option 2: Using `just`
 
-1. Open the project in Xcode:
    ```bash
-   cd bitchat
-   open Package.swift
+   brew install just
    ```
 
-2. Select your target device and run
-
-### Option 3: Manual Xcode Project
-
-1. Open Xcode and create a new iOS/macOS App
-2. Copy all Swift files from the `bitchat` directory into your project
-3. Update Info.plist with Bluetooth permissions
-4. Set deployment target to iOS 16.0 / macOS 13.0
-
-### Option 4: just
-
-Want to try this on macos: `just run` will set it up and run from source. 
+Want to try this on macos: `just run` will set it up and run from source.
 Run `just clean` afterwards to restore things to original state for mobile app building and development.
+
+## Localization
+
+- Base app resources live under `bitchat/Localization/Base.lproj/`. Add new copy to `Localizable.strings` and plural rules to `Localizable.stringsdict`.
+- Share extension strings are separate in `bitchatShareExtension/Localization/Base.lproj/Localizable.strings`.
+- Prefer keys that describe intent (`app_info.features.offline.title`) and reuse existing ones where possible.
+- Run `xcodebuild -project bitchat.xcodeproj -scheme "bitchat (macOS)" -configuration Debug CODE_SIGNING_ALLOWED=NO build` to compile-check any localization updates.

WHITEPAPER.md

@@ -98,7 +98,7 @@ While the Noise handshake cryptographically authenticates a peer's key, it doesn
 ### 4.2. Favorites and Blocking
 
 To improve the user experience and provide control over interactions, the protocol supports:
-*   **Favorites:** Users can mark trusted or frequently contacted peers as "favorites." This is a local designation that can be used by the application to prioritize notifications or display peers more prominently.
+*   **Favorites:** Users can mark trusted or frequently contacted peers as "favorites". This is a local designation that can be used by the application to prioritize notifications or display peers more prominently.
 *   **Blocking:** Users can block peers. When a peer is blocked, the application will discard any incoming packets from that peer's fingerprint at the earliest possible stage, effectively silencing them without notifying the blocked peer.
 
 ---
@@ -184,6 +184,28 @@ To minimize bandwidth, `BitchatPacket`s are serialized into a compact binary for
 
 **Padding:** All packets are padded to the next standard block size (256, 512, 1024, or 2048 bytes) using a PKCS#7-style scheme to obscure the true message length from network observers.
 
+```mermaid
+---
+config:
+  theme: dark
+---
+---
+title: "BitchatPacket"
+---
+packet
++8: "Version"
++8: "Type"
++8: "TTL"
++64: "Timestamp"
++8: "Flags"
++16: "Payload Length"
++64: "Sender ID"
++64: "Recipient ID (optional)"
++48: "Payload (variable)"
++64: "Signature (optional)"
+```
+_A representation of the sizes of the fields in `BitchatPacket`_
+
 ### 6.2. Application Message Format (`BitchatMessage`)
 
 For packets of type `message`, the payload is a binary-serialized `BitchatMessage` containing the chat content.
@@ -198,6 +220,25 @@ For packets of type `message`, the payload is a binary-serialized `BitchatMessag
 | Original Sender     | 1 + len (opt)| Nickname of the original sender if the message is a relay.               |
 | Recipient Nickname  | 1 + len (opt)| Nickname of the recipient for private messages.                          |
 
+```mermaid
+---
+config:
+  theme: dark
+---
+---
+title: "BitchatMessage"
+---
+packet
++8: "Flags"
++64: "Timestamp"
++24: "ID (variable)"
++32: "Sender (variable)"
++32: "Content (variable)"
++32: "Original Sender (variable) (optional)"
++32: "Recipient Nickname (variable) (optional)"
+```
+_A representation of the sizes of the fields in `BitchatMessage`_
+
 ---
 
 ## 7. Message Routing and Propagation
@@ -215,7 +256,7 @@ To send messages to peers that are not directly connected, BitChat employs a "fl
 The logic is as follows:
 
 1.  A peer receives a packet.
-2.  It checks the Bloom filter to see if the packet's ID has likely been seen before. If so, the packet is discarded. Bloom filters can have false positives (though they are rare), but they guarantee no false negatives. This means a new packet will never be accidentally discarded.
+2.  It checks the Bloom filter to see if the packet's ID has likely been seen before. If so, the packet is discarded. Bloom filters can have false positives (though they are rare), but they guarantee no false negatives. This means that while some packets may be incorrectly discarded due to false positives, the gossip protocol's redundancy ensures these packets will eventually be received through subsequent exchanges with other peers.
 3.  If the packet is new, its ID is added to the Bloom filter.
 4.  The peer decrements the packet's Time-To-Live (TTL) field.
 5.  If the TTL is greater than zero, the peer re-broadcasts the packet to all of its connected peers, *except* for the peer from which it received the packet.
@@ -265,4 +306,4 @@ Receiving peers collect all fragments and reassemble them in the correct order b
 
 ## 9. Conclusion
 
-The BitChat Protocol provides a robust and secure foundation for decentralized, peer-to-peer communication. By layering a flexible application protocol on top of the well-regarded Noise Protocol Framework, it achieves strong confidentiality, authentication, and forward secrecy. The use of a compact binary format and thoughtful security considerations like rate limiting and traffic analysis resistance make it suitable for use in challenging network environments.
+The BitChat Protocol provides a robust and secure foundation for decentralized, peer-to-peer communication. By layering a flexible application protocol on top of the well-regarded Noise Protocol Framework, it achieves strong confidentiality, authentication, and forward secrecy. The use of a compact binary format and thoughtful security considerations like rate limiting and traffic analysis resistance make it suitable for use in challenging network environments.

bitchat.xcodeproj/xcshareddata/xcschemes/bitchat (iOS).xcscheme

@@ -0,0 +1,131 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1640"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "57CA17A36A2532A6CFF367BB"
+               BuildableName = "bitchatShareExtension.appex"
+               BlueprintName = "bitchatShareExtension"
+               ReferencedContainer = "container:bitchat.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AF077EA0474EDEDE2C72716C"
+               BuildableName = "bitchat.app"
+               BlueprintName = "bitchat_iOS"
+               ReferencedContainer = "container:bitchat.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES"
+      onlyGenerateCoverageForSpecifiedTargets = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "AF077EA0474EDEDE2C72716C"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_iOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <CodeCoverageTargets>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "AF077EA0474EDEDE2C72716C"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_iOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </CodeCoverageTargets>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES"
+            testExecutionOrdering = "random">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "6CB97DF2EA57234CB3E563B8"
+               BuildableName = "bitchatTests_iOS.xctest"
+               BlueprintName = "bitchatTests_iOS"
+               ReferencedContainer = "container:bitchat.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "AF077EA0474EDEDE2C72716C"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_iOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "BITCHAT_LOG_LEVEL"
+            value = "debug"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "AF077EA0474EDEDE2C72716C"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_iOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

bitchat.xcodeproj/xcshareddata/xcschemes/bitchat (macOS).xcscheme

@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1640"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "0576A29205865664C0937536"
+               BuildableName = "bitchat.app"
+               BlueprintName = "bitchat_macOS"
+               ReferencedContainer = "container:bitchat.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0576A29205865664C0937536"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_macOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "47FF23248747DD7CB666CB91"
+               BuildableName = "bitchatTests_macOS.xctest"
+               BlueprintName = "bitchatTests_macOS"
+               ReferencedContainer = "container:bitchat.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0576A29205865664C0937536"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_macOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "BITCHAT_LOG_LEVEL"
+            value = "debug"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "0576A29205865664C0937536"
+            BuildableName = "bitchat.app"
+            BlueprintName = "bitchat_macOS"
+            ReferencedContainer = "container:bitchat.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

bitchat/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,111 +1,9 @@
 {
   "images" : [
-    {
-      "filename" : "icon_20x20@2x.png",
-      "idiom" : "iphone",
-      "scale" : "2x",
-      "size" : "20x20"
-    },
-    {
-      "filename" : "icon_20x20@3x.png",
-      "idiom" : "iphone",
-      "scale" : "3x",
-      "size" : "20x20"
-    },
-    {
-      "filename" : "icon_29x29@2x.png",
-      "idiom" : "iphone",
-      "scale" : "2x",
-      "size" : "29x29"
-    },
-    {
-      "filename" : "icon_29x29@3x.png",
-      "idiom" : "iphone",
-      "scale" : "3x",
-      "size" : "29x29"
-    },
-    {
-      "filename" : "icon_40x40@2x.png",
-      "idiom" : "iphone",
-      "scale" : "2x",
-      "size" : "40x40"
-    },
-    {
-      "filename" : "icon_40x40@3x.png",
-      "idiom" : "iphone",
-      "scale" : "3x",
-      "size" : "40x40"
-    },
-    {
-      "filename" : "icon_60x60@2x.png",
-      "idiom" : "iphone",
-      "scale" : "2x",
-      "size" : "60x60"
-    },
-    {
-      "filename" : "icon_60x60@3x.png",
-      "idiom" : "iphone",
-      "scale" : "3x",
-      "size" : "60x60"
-    },
-    {
-      "filename" : "icon_20x20.png",
-      "idiom" : "ipad",
-      "scale" : "1x",
-      "size" : "20x20"
-    },
-    {
-      "filename" : "icon_20x20@2x.png",
-      "idiom" : "ipad",
-      "scale" : "2x",
-      "size" : "20x20"
-    },
-    {
-      "filename" : "icon_29x29.png",
-      "idiom" : "ipad",
-      "scale" : "1x",
-      "size" : "29x29"
-    },
-    {
-      "filename" : "icon_29x29@2x.png",
-      "idiom" : "ipad",
-      "scale" : "2x",
-      "size" : "29x29"
-    },
-    {
-      "filename" : "icon_40x40.png",
-      "idiom" : "ipad",
-      "scale" : "1x",
-      "size" : "40x40"
-    },
-    {
-      "filename" : "icon_40x40@2x.png",
-      "idiom" : "ipad",
-      "scale" : "2x",
-      "size" : "40x40"
-    },
-    {
-      "filename" : "icon_76x76.png",
-      "idiom" : "ipad",
-      "scale" : "1x",
-      "size" : "76x76"
-    },
-    {
-      "filename" : "icon_76x76@2x.png",
-      "idiom" : "ipad",
-      "scale" : "2x",
-      "size" : "76x76"
-    },
-    {
-      "filename" : "icon_83.5x83.5@2x.png",
-      "idiom" : "ipad",
-      "scale" : "2x",
-      "size" : "83.5x83.5"
-    },
     {
       "filename" : "icon_1024x1024.png",
-      "idiom" : "ios-marketing",
-      "scale" : "1x",
+      "idiom" : "universal",
+      "platform" : "ios",
       "size" : "1024x1024"
     },
     {

bitchat/Assets.xcassets/AppIconDebug.appiconset/Contents.json

@@ -0,0 +1,36 @@
+{
+  "images" : [
+    {
+      "filename" : "image-1024.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "tinted"
+        }
+      ],
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

bitchat/Assets.xcassets/Contents.json

@@ -3,4 +3,4 @@
     "author" : "xcode",
     "version" : 1
   }
-}
+}

bitchat/BitchatApp.swift

@@ -6,20 +6,42 @@
 // For more information, see <https://unlicense.org>
 //
 
+import Tor
 import SwiftUI
 import UserNotifications
 
 @main
 struct BitchatApp: App {
-    @StateObject private var chatViewModel = ChatViewModel()
+    static let bundleID = Bundle.main.bundleIdentifier ?? "chat.bitchat"
+    static let groupID = "group.\(bundleID)"
+    
+    @StateObject private var chatViewModel: ChatViewModel
     #if os(iOS)
+    @Environment(\.scenePhase) var scenePhase
     @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
+    // Skip the very first .active-triggered Tor restart on cold launch
+    @State private var didHandleInitialActive: Bool = false
+    @State private var didEnterBackground: Bool = false
     #elseif os(macOS)
     @NSApplicationDelegateAdaptor(MacAppDelegate.self) var appDelegate
     #endif
     
+    private let idBridge = NostrIdentityBridge()
+    
     init() {
+        let keychain = KeychainManager()
+        let idBridge = self.idBridge
+        _chatViewModel = StateObject(
+            wrappedValue: ChatViewModel(
+                keychain: keychain,
+                idBridge: idBridge,
+                identityManager: SecureIdentityStateManager(keychain)
+            )
+        )
+        
         UNUserNotificationCenter.current().delegate = NotificationDelegate.shared
+        // Warm up georelay directory and refresh if stale (once/day)
+        GeoRelayDirectory.shared.prefetchIfNeeded()
     }
     
     var body: some Scene {
@@ -28,11 +50,19 @@ struct BitchatApp: App {
                 .environmentObject(chatViewModel)
                 .onAppear {
                     NotificationDelegate.shared.chatViewModel = chatViewModel
-                    #if os(iOS)
+                    // Inject live Noise service into VerificationService to avoid creating new BLE instances
+                    VerificationService.shared.configure(with: chatViewModel.meshService.getNoiseService())
+                    // Prewarm Nostr identity and QR to make first VERIFY sheet fast
+                    let nickname = chatViewModel.nickname
+                    DispatchQueue.global(qos: .utility).async {
+                        let npub = try? idBridge.getCurrentNostrIdentity()?.npub
+                        _ = VerificationService.shared.buildMyQRString(nickname: nickname, npub: npub)
+                    }
+
                     appDelegate.chatViewModel = chatViewModel
-                    #elseif os(macOS)
-                    appDelegate.chatViewModel = chatViewModel
-                    #endif
+
+                    // Initialize network activation policy; will start Tor/Nostr only when allowed
+                    NetworkActivationService.shared.start()
                     // Check for shared content
                     checkForSharedContent()
                 }
@@ -40,16 +70,59 @@ struct BitchatApp: App {
                     handleURL(url)
                 }
                 #if os(iOS)
+                .onChange(of: scenePhase) { newPhase in
+                    switch newPhase {
+                    case .background:
+                        // Keep BLE mesh running in background; BLEService adapts scanning automatically
+                        // Always send Tor to dormant on background for a clean restart later.
+                        TorManager.shared.setAppForeground(false)
+                        TorManager.shared.goDormantOnBackground()
+                        // Stop geohash sampling while backgrounded
+                        Task { @MainActor in
+                            chatViewModel.endGeohashSampling()
+                        }
+                        // Proactively disconnect Nostr to avoid spurious socket errors while Tor is down
+                        NostrRelayManager.shared.disconnect()
+                        didEnterBackground = true
+                    case .active:
+                        // Restart services when becoming active
+                        chatViewModel.meshService.startServices()
+                        TorManager.shared.setAppForeground(true)
+                        // On initial cold launch, Tor was just started in onAppear.
+                        // Skip the deterministic restart the first time we become active.
+                        if didHandleInitialActive && didEnterBackground {
+                            if TorManager.shared.isAutoStartAllowed() && !TorManager.shared.isReady {
+                                TorManager.shared.ensureRunningOnForeground()
+                            }
+                        } else {
+                            didHandleInitialActive = true
+                        }
+                        didEnterBackground = false
+                        if TorManager.shared.isAutoStartAllowed() {
+                            Task.detached {
+                                let _ = await TorManager.shared.awaitReady(timeout: 60)
+                                await MainActor.run {
+                                    // Rebuild proxied sessions to bind to the live Tor after readiness
+                                    TorURLSession.shared.rebuild()
+                                    // Reconnect Nostr via fresh sessions; will gate until Tor 100%
+                                    NostrRelayManager.shared.resetAllConnections()
+                                }
+                            }
+                        }
+                        checkForSharedContent()
+                    case .inactive:
+                        break
+                    @unknown default:
+                        break
+                    }
+                }
                 .onReceive(NotificationCenter.default.publisher(for: UIApplication.didBecomeActiveNotification)) { _ in
                     // Check for shared content when app becomes active
                     checkForSharedContent()
-                    // Notify MessageRouter to check for Nostr messages
-                    NotificationCenter.default.post(name: .appDidBecomeActive, object: nil)
                 }
                 #elseif os(macOS)
                 .onReceive(NotificationCenter.default.publisher(for: NSApplication.didBecomeActiveNotification)) { _ in
-                    // Notify MessageRouter to check for Nostr messages
-                    NotificationCenter.default.post(name: .appDidBecomeActive, object: nil)
+                    // App became active
                 }
                 #endif
         }
@@ -68,7 +141,7 @@ struct BitchatApp: App {
     
     private func checkForSharedContent() {
         // Check app group for shared content from extension
-        guard let userDefaults = UserDefaults(suiteName: "group.chat.bitchat") else {
+        guard let userDefaults = UserDefaults(suiteName: BitchatApp.groupID) else {
             return
         }
         
@@ -77,30 +150,18 @@ struct BitchatApp: App {
             return
         }
         
-        // Only process if shared within last 30 seconds
-        if Date().timeIntervalSince(sharedDate) < 30 {
+        // Only process if shared within configured window
+        if Date().timeIntervalSince(sharedDate) < TransportConfig.uiShareAcceptWindowSeconds {
             let contentType = userDefaults.string(forKey: "sharedContentType") ?? "text"
             
             // Clear the shared content
             userDefaults.removeObject(forKey: "sharedContent")
             userDefaults.removeObject(forKey: "sharedContentType")
             userDefaults.removeObject(forKey: "sharedContentDate")
-            userDefaults.synchronize()
+            // No need to force synchronize here
             
-            // Show notification about shared content
+            // Send the shared content immediately on the main queue
             DispatchQueue.main.async {
-                // Add system message about sharing
-                let systemMessage = BitchatMessage(
-                    sender: "system",
-                    content: "preparing to share \(contentType)...",
-                    timestamp: Date(),
-                    isRelay: false
-                )
-                self.chatViewModel.messages.append(systemMessage)
-            }
-            
-            // Send the shared content after a short delay
-            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                 if contentType == "url" {
                     // Try to parse as JSON first
                     if let data = sharedContent.data(using: .utf8),
@@ -121,19 +182,23 @@ struct BitchatApp: App {
 }
 
 #if os(iOS)
-class AppDelegate: NSObject, UIApplicationDelegate {
+final class AppDelegate: NSObject, UIApplicationDelegate {
     weak var chatViewModel: ChatViewModel?
     
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
         return true
     }
+    
+    func applicationWillTerminate(_ application: UIApplication) {
+        chatViewModel?.applicationWillTerminate()
+    }
 }
 #endif
 
 #if os(macOS)
 import AppKit
 
-class MacAppDelegate: NSObject, NSApplicationDelegate {
+final class MacAppDelegate: NSObject, NSApplicationDelegate {
     weak var chatViewModel: ChatViewModel?
     
     func applicationWillTerminate(_ notification: Notification) {
@@ -146,7 +211,7 @@ class MacAppDelegate: NSObject, NSApplicationDelegate {
 }
 #endif
 
-class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
+final class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
     static let shared = NotificationDelegate()
     weak var chatViewModel: ChatViewModel?
     
@@ -159,10 +224,18 @@ class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
             // Get peer ID from userInfo
             if let peerID = userInfo["peerID"] as? String {
                 DispatchQueue.main.async {
-                    self.chatViewModel?.startPrivateChat(with: peerID)
+                    self.chatViewModel?.startPrivateChat(with: PeerID(str: peerID))
                 }
             }
         }
+        // Handle deeplink (e.g., geohash activity)
+        if let deep = userInfo["deeplink"] as? String, let url = URL(string: deep) {
+            #if os(iOS)
+            DispatchQueue.main.async { UIApplication.shared.open(url) }
+            #else
+            DispatchQueue.main.async { NSWorkspace.shared.open(url) }
+            #endif
+        }
         
         completionHandler()
     }
@@ -176,10 +249,24 @@ class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
             // Get peer ID from userInfo
             if let peerID = userInfo["peerID"] as? String {
                 // Don't show notification if the private chat is already open
-                if chatViewModel?.selectedPrivateChatPeer == peerID {
-                    completionHandler([])
-                    return
+                // Access main-actor-isolated property via Task
+                Task { @MainActor in
+                    if self.chatViewModel?.selectedPrivateChatPeer == PeerID(str: peerID) {
+                        completionHandler([])
+                    } else {
+                        completionHandler([.banner, .sound])
+                    }
                 }
+                return
+            }
+        }
+        // Suppress geohash activity notification if we're already in that geohash channel
+        if identifier.hasPrefix("geo-activity-"),
+           let deep = userInfo["deeplink"] as? String,
+           let gh = deep.components(separatedBy: "/").last {
+            if case .location(let ch) = LocationChannelManager.shared.selectedChannel, ch.geohash == gh {
+                completionHandler([])
+                return
             }
         }
         
@@ -192,4 +279,4 @@ extension String {
     var nilIfEmpty: String? {
         self.isEmpty ? nil : self
     }
-}
+}

bitchat/Features/media/ImageUtils.swift

@@ -0,0 +1,203 @@
+import Foundation
+import ImageIO
+import UniformTypeIdentifiers
+#if os(iOS)
+import UIKit
+#else
+import AppKit
+#endif
+
+enum ImageUtilsError: Error {
+    case invalidImage
+    case encodingFailed
+}
+
+enum ImageUtils {
+    private static let compressionQuality: CGFloat = 0.82
+    private static let targetImageBytes: Int = 45_000
+
+    static func processImage(at url: URL, maxDimension: CGFloat = 448) throws -> URL {
+        // Security H1: Check file size BEFORE reading into memory
+        let attrs = try FileManager.default.attributesOfItem(atPath: url.path)
+        guard let fileSize = attrs[.size] as? Int else {
+            throw ImageUtilsError.invalidImage
+        }
+        // Allow up to 10MB source images (will be scaled down)
+        guard fileSize <= 10 * 1024 * 1024 else {
+            throw ImageUtilsError.invalidImage
+        }
+
+        let data = try Data(contentsOf: url)
+        #if os(iOS)
+        guard let image = UIImage(data: data) else { throw ImageUtilsError.invalidImage }
+        return try processImage(image, maxDimension: maxDimension)
+        #else
+        guard let image = NSImage(data: data) else { throw ImageUtilsError.invalidImage }
+        return try processImage(image, maxDimension: maxDimension)
+        #endif
+    }
+
+    #if os(iOS)
+    static func processImage(_ image: UIImage, maxDimension: CGFloat = 448) throws -> URL {
+        return try autoreleasepool {
+            // Scale the image first
+            let scaled = scaledImage(image, maxDimension: maxDimension)
+
+            // Get CGImage from UIImage - this is the key to stripping metadata
+            guard let cgImage = scaled.cgImage else {
+                throw ImageUtilsError.encodingFailed
+            }
+
+            // Use CGImageDestination to encode without metadata (same as macOS)
+            var quality = compressionQuality
+            guard var jpegData = encodeJPEG(from: cgImage, quality: quality) else {
+                throw ImageUtilsError.encodingFailed
+            }
+
+            // Compress to target size
+            while jpegData.count > targetImageBytes && quality > 0.3 {
+                quality -= 0.1
+                autoreleasepool {
+                    if let next = encodeJPEG(from: cgImage, quality: quality) {
+                        jpegData = next
+                    }
+                }
+            }
+
+            let outputURL = try makeOutputURL()
+            try jpegData.write(to: outputURL, options: .atomic)
+            return outputURL
+        }
+    }
+
+    private static func scaledImage(_ image: UIImage, maxDimension: CGFloat) -> UIImage {
+        let size = image.size
+        let maxSide = max(size.width, size.height)
+        guard maxSide > maxDimension else { return image }
+        let scale = maxDimension / maxSide
+        let newSize = CGSize(width: size.width * scale, height: size.height * scale)
+
+        // Draw into a new context to get a clean CGImage without metadata
+        UIGraphicsBeginImageContextWithOptions(newSize, true, 1.0)
+        image.draw(in: CGRect(origin: .zero, size: newSize))
+        let rendered = UIGraphicsGetImageFromCurrentImageContext()
+        UIGraphicsEndImageContext()
+        return rendered ?? image
+    }
+
+    // Shared EXIF-stripping JPEG encoder for both iOS and macOS
+    private static func encodeJPEG(from cgImage: CGImage, quality: CGFloat) -> Data? {
+        guard let data = CFDataCreateMutable(nil, 0) else {
+            return nil
+        }
+        guard let destination = CGImageDestinationCreateWithData(data, UTType.jpeg.identifier as CFString, 1, nil) else {
+            return nil
+        }
+        // Security: Strip ALL metadata (EXIF, GPS, TIFF, IPTC, XMP)
+        // By only specifying compression quality and no metadata keys,
+        // we ensure a clean JPEG with no privacy-leaking information
+        let options: [CFString: Any] = [
+            kCGImageDestinationLossyCompressionQuality: quality
+        ]
+        CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
+        guard CGImageDestinationFinalize(destination) else {
+            return nil
+        }
+        return data as Data
+    }
+    #else
+    static func processImage(_ image: NSImage, maxDimension: CGFloat = 448) throws -> URL {
+        return try autoreleasepool {
+            let scaled = scaledImage(image, maxDimension: maxDimension)
+            guard let inputCG = scaled.cgImage(forProposedRect: nil, context: nil, hints: nil) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            let width = inputCG.width
+            let height = inputCG.height
+            let colorSpace = CGColorSpace(name: CGColorSpace.sRGB) ?? CGColorSpaceCreateDeviceRGB()
+            guard let context = CGContext(
+                data: nil,
+                width: width,
+                height: height,
+                bitsPerComponent: 8,
+                bytesPerRow: 0,
+                space: colorSpace,
+                bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
+            ) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            context.draw(inputCG, in: CGRect(x: 0, y: 0, width: width, height: height))
+            guard let cgImage = context.makeImage() else {
+                throw ImageUtilsError.encodingFailed
+            }
+            var quality = compressionQuality
+            guard var jpegData = encodeJPEG(from: cgImage, quality: quality) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            while jpegData.count > targetImageBytes && quality > 0.3 {
+                quality -= 0.1
+                autoreleasepool {
+                    if let next = encodeJPEG(from: cgImage, quality: quality) {
+                        jpegData = next
+                    }
+                }
+            }
+            let outputURL = try makeOutputURL()
+            try jpegData.write(to: outputURL, options: .atomic)
+            return outputURL
+        }
+    }
+
+    private static func scaledImage(_ image: NSImage, maxDimension: CGFloat) -> NSImage {
+        let size = image.size
+        let maxSide = max(size.width, size.height)
+        guard maxSide > maxDimension else { return image }
+        let scale = maxDimension / maxSide
+        let newSize = NSSize(width: size.width * scale, height: size.height * scale)
+        let scaledImage = NSImage(size: newSize)
+        scaledImage.lockFocus()
+        image.draw(in: NSRect(origin: .zero, size: newSize),
+                   from: NSRect(origin: .zero, size: size),
+                   operation: .copy,
+                   fraction: 1.0)
+        scaledImage.unlockFocus()
+        return scaledImage
+    }
+
+    // Shared EXIF-stripping JPEG encoder for both iOS and macOS
+    private static func encodeJPEG(from cgImage: CGImage, quality: CGFloat) -> Data? {
+        guard let data = CFDataCreateMutable(nil, 0) else {
+            return nil
+        }
+        guard let destination = CGImageDestinationCreateWithData(data, UTType.jpeg.identifier as CFString, 1, nil) else {
+            return nil
+        }
+        // Security: Strip ALL metadata (EXIF, GPS, TIFF, IPTC, XMP)
+        // By only specifying compression quality and no metadata keys,
+        // we ensure a clean JPEG with no privacy-leaking information
+        let options: [CFString: Any] = [
+            kCGImageDestinationLossyCompressionQuality: quality
+        ]
+        CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
+        guard CGImageDestinationFinalize(destination) else {
+            return nil
+        }
+        return data as Data
+    }
+    #endif
+
+    private static func makeOutputURL() throws -> URL {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyyMMdd_HHmmss"
+        let fileName = "img_\(formatter.string(from: Date())).jpg"
+
+        let directory = try applicationFilesDirectory().appendingPathComponent("images/outgoing", isDirectory: true)
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true, attributes: nil)
+        return directory.appendingPathComponent(fileName)
+    }
+
+    private static func applicationFilesDirectory() throws -> URL {
+        let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        return base.appendingPathComponent("files", isDirectory: true)
+    }
+}

bitchat/Features/voice/VoiceNotePlaybackController.swift

@@ -0,0 +1,193 @@
+import Foundation
+import AVFoundation
+import BitLogger
+
+/// Controls playback for a single voice note and coordinates exclusive playback across the app.
+final class VoiceNotePlaybackController: NSObject, ObservableObject, AVAudioPlayerDelegate {
+    @Published private(set) var isPlaying: Bool = false
+    @Published private(set) var currentTime: TimeInterval = 0
+    @Published private(set) var duration: TimeInterval = 0
+    @Published private(set) var progress: Double = 0
+
+    private var player: AVAudioPlayer?
+    private var timer: Timer?
+    private var url: URL
+
+    init(url: URL) {
+        self.url = url
+        super.init()
+        // Don't load anything eagerly - wait until user interaction or view is fully displayed
+    }
+
+    func loadDuration() {
+        guard duration == 0 else { return }
+
+        DispatchQueue.global(qos: .utility).async { [weak self] in
+            guard let self = self else { return }
+            do {
+                let player = try AVAudioPlayer(contentsOf: self.url)
+                let loadedDuration = player.duration
+                DispatchQueue.main.async { [weak self] in
+                    guard let self = self, self.duration == 0 else { return }
+                    self.duration = loadedDuration
+                }
+            } catch {
+                SecureLogger.error("Failed to load audio duration: \(error)", category: .session)
+            }
+        }
+    }
+
+    deinit {
+        timer?.invalidate()
+    }
+
+    func replaceURL(_ url: URL) {
+        guard url != self.url else { return }
+        stop()
+        self.url = url
+        player = nil
+        duration = 0
+        // Duration will be loaded on demand when needed
+    }
+
+    func togglePlayback() {
+        isPlaying ? pause() : play()
+    }
+
+    func play() {
+        guard ensurePlayerReady() else { return }
+        VoiceNotePlaybackCoordinator.shared.activate(self)
+        player?.play()
+        startTimer()
+        updateProgress()
+        isPlaying = true
+    }
+
+    func pause() {
+        player?.pause()
+        stopTimer()
+        updateProgress()
+        isPlaying = false
+    }
+
+    func stop() {
+        player?.stop()
+        player?.currentTime = 0
+        stopTimer()
+        updateProgress()
+        isPlaying = false
+        VoiceNotePlaybackCoordinator.shared.deactivate(self)
+    }
+
+    func seek(to fraction: Double) {
+        guard ensurePlayerReady() else { return }
+        let clamped = max(0, min(1, fraction))
+        if let player = player {
+            player.currentTime = clamped * player.duration
+            if isPlaying {
+                player.play()
+            }
+            updateProgress()
+        }
+    }
+
+    // MARK: - AVAudioPlayerDelegate
+
+    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
+        // Delegate callback may be on background thread - ensure main thread for UI updates
+        DispatchQueue.main.async { [weak self] in
+            guard let self = self else { return }
+            self.stopTimer()
+            self.updateProgress()
+            self.isPlaying = false
+            VoiceNotePlaybackCoordinator.shared.deactivate(self)
+        }
+    }
+
+    // MARK: - Private Helpers
+
+    private func preparePlayer(for url: URL) {
+        // Prepare player synchronously (only called when playback is requested)
+        do {
+            let player = try AVAudioPlayer(contentsOf: url)
+            player.delegate = self
+            player.prepareToPlay()
+            self.player = player
+            duration = player.duration
+            currentTime = player.currentTime
+            progress = duration > 0 ? currentTime / duration : 0
+        } catch {
+            SecureLogger.error("Voice note playback failed for \(url.lastPathComponent): \(error)", category: .session)
+            player = nil
+            duration = 0
+            currentTime = 0
+            progress = 0
+        }
+    }
+
+    private func ensurePlayerReady() -> Bool {
+        if player == nil {
+            preparePlayer(for: url)
+        }
+        #if os(iOS)
+        let session = AVAudioSession.sharedInstance()
+        do {
+            try session.setCategory(.playback, mode: .spokenAudio, options: [.mixWithOthers])
+            try session.setActive(true, options: [])
+        } catch {
+            SecureLogger.error("Failed to activate audio session: \(error)", category: .session)
+        }
+        #endif
+        return player != nil
+    }
+
+    private func startTimer() {
+        if timer != nil { return }
+        timer = Timer.scheduledTimer(withTimeInterval: 0.05, repeats: true) { [weak self] _ in
+            self?.updateProgress()
+        }
+        if let timer = timer {
+            RunLoop.main.add(timer, forMode: .common)
+        }
+    }
+
+    private func stopTimer() {
+        timer?.invalidate()
+        timer = nil
+    }
+
+    private func updateProgress() {
+        guard let player = player else {
+            currentTime = 0
+            duration = 0
+            progress = 0
+            return
+        }
+        currentTime = player.currentTime
+        duration = player.duration
+        progress = duration > 0 ? currentTime / duration : 0
+    }
+}
+
+/// Ensures only one voice note plays at a time.
+final class VoiceNotePlaybackCoordinator {
+    static let shared = VoiceNotePlaybackCoordinator()
+
+    private weak var activeController: VoiceNotePlaybackController?
+
+    private init() {}
+
+    func activate(_ controller: VoiceNotePlaybackController) {
+        if activeController === controller {
+            return
+        }
+        activeController?.pause()
+        activeController = controller
+    }
+
+    func deactivate(_ controller: VoiceNotePlaybackController) {
+        if activeController === controller {
+            activeController = nil
+        }
+    }
+}

bitchat/Features/voice/VoiceRecorder.swift

@@ -0,0 +1,170 @@
+import Foundation
+import AVFoundation
+
+/// Manages audio capture for mesh voice notes with predictable encoding settings.
+/// Recording runs on an internal serial queue to avoid AVAudioSession contention.
+final class VoiceRecorder: NSObject, AVAudioRecorderDelegate {
+    enum RecorderError: Error {
+        case microphoneAccessDenied
+        case recorderInitializationFailed
+        case recordingInProgress
+    }
+
+    static let shared = VoiceRecorder()
+
+    private let queue = DispatchQueue(label: "com.bitchat.voice-recorder")
+    private let paddingInterval: TimeInterval = 0.5
+    private let maxRecordingDuration: TimeInterval = 120
+
+    private var recorder: AVAudioRecorder?
+    private var currentURL: URL?
+    private var stopWorkItem: DispatchWorkItem?
+
+    private override init() {
+        super.init()
+    }
+
+    // MARK: - Permissions
+
+    @discardableResult
+    func requestPermission() async -> Bool {
+        #if os(iOS)
+        return await withCheckedContinuation { continuation in
+            AVAudioSession.sharedInstance().requestRecordPermission { granted in
+                continuation.resume(returning: granted)
+            }
+        }
+        #elseif os(macOS)
+        return await withCheckedContinuation { continuation in
+            AVCaptureDevice.requestAccess(for: .audio) { granted in
+                continuation.resume(returning: granted)
+            }
+        }
+        #else
+        return true
+        #endif
+    }
+
+    // MARK: - Recording Lifecycle
+
+    func startRecording() throws -> URL {
+        try queue.sync {
+            if recorder?.isRecording == true {
+                throw RecorderError.recordingInProgress
+            }
+
+            #if os(iOS)
+            let session = AVAudioSession.sharedInstance()
+            guard session.recordPermission == .granted else {
+                throw RecorderError.microphoneAccessDenied
+            }
+            try session.setCategory(
+                .playAndRecord,
+                mode: .default,
+                options: [.defaultToSpeaker, .allowBluetoothA2DP, .allowBluetoothHFP]
+            )
+            try session.setActive(true, options: .notifyOthersOnDeactivation)
+            #endif
+            #if os(macOS)
+            guard AVCaptureDevice.authorizationStatus(for: .audio) == .authorized else {
+                throw RecorderError.microphoneAccessDenied
+            }
+            #endif
+
+            let outputURL = try makeOutputURL()
+            let settings: [String: Any] = [
+                AVFormatIDKey: kAudioFormatMPEG4AAC,
+                AVSampleRateKey: 16_000,
+                AVNumberOfChannelsKey: 1,
+                AVEncoderBitRateKey: 16_000
+            ]
+
+            let audioRecorder = try AVAudioRecorder(url: outputURL, settings: settings)
+            audioRecorder.delegate = self
+            audioRecorder.isMeteringEnabled = true
+            audioRecorder.prepareToRecord()
+            audioRecorder.record(forDuration: maxRecordingDuration)
+
+            recorder = audioRecorder
+            currentURL = outputURL
+            stopWorkItem?.cancel()
+            stopWorkItem = nil
+            return outputURL
+        }
+    }
+
+    func stopRecording(completion: @escaping (URL?) -> Void) {
+        queue.async { [weak self] in
+            guard let self = self, let recorder = self.recorder, recorder.isRecording else {
+                completion(self?.currentURL)
+                return
+            }
+
+            let item = DispatchWorkItem { [weak self] in
+                guard let self = self else { return }
+                recorder.stop()
+                self.cleanupSession()
+                let url = self.currentURL
+                self.recorder = nil
+                self.currentURL = url
+                completion(url)
+            }
+            self.stopWorkItem = item
+            self.queue.asyncAfter(deadline: .now() + self.paddingInterval, execute: item)
+        }
+    }
+
+    func cancelRecording() {
+        queue.async { [weak self] in
+            guard let self = self else { return }
+            self.stopWorkItem?.cancel()
+            self.stopWorkItem = nil
+            if let recorder = self.recorder, recorder.isRecording {
+                recorder.stop()
+            }
+            self.cleanupSession()
+            if let url = self.currentURL {
+                try? FileManager.default.removeItem(at: url)
+            }
+            self.recorder = nil
+            self.currentURL = nil
+        }
+    }
+
+    // MARK: - Metering
+
+    func currentAveragePower() -> Float {
+        queue.sync {
+            recorder?.updateMeters()
+            return recorder?.averagePower(forChannel: 0) ?? -160
+        }
+    }
+
+    // MARK: - Helpers
+
+    private func makeOutputURL() throws -> URL {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyyMMdd_HHmmss"
+        let fileName = "voice_\(formatter.string(from: Date())).m4a"
+
+        let baseDirectory = try applicationFilesDirectory().appendingPathComponent("voicenotes/outgoing", isDirectory: true)
+        try FileManager.default.createDirectory(at: baseDirectory, withIntermediateDirectories: true, attributes: nil)
+        return baseDirectory.appendingPathComponent(fileName)
+    }
+
+    private func applicationFilesDirectory() throws -> URL {
+        #if os(iOS)
+        return try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+            .appendingPathComponent("files", isDirectory: true)
+        #else
+        let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        return base.appendingPathComponent("files", isDirectory: true)
+        #endif
+    }
+
+    private func cleanupSession() {
+        #if os(iOS)
+        try? AVAudioSession.sharedInstance().setActive(false, options: .notifyOthersOnDeactivation)
+        #endif
+    }
+}

bitchat/Features/voice/Waveform.swift

@@ -0,0 +1,113 @@
+import AVFoundation
+import Foundation
+import BitLogger
+
+/// Generates and caches downsampled waveforms for audio files so UI rendering is cheap.
+final class WaveformCache {
+    static let shared = WaveformCache()
+
+    private let queue = DispatchQueue(label: "com.bitchat.waveform-cache", attributes: .concurrent)
+    private var cache: [URL: (waveform: [Float], lastAccess: Date)] = [:]
+    private let maxCacheSize = 20  // Limit cache to prevent unbounded memory growth
+
+    private init() {}
+
+    func cachedWaveform(for url: URL) -> [Float]? {
+        queue.sync {
+            guard let entry = cache[url] else { return nil }
+            return entry.waveform
+        }
+    }
+
+    func waveform(for url: URL, bins: Int = 120, completion: @escaping ([Float]) -> Void) {
+        queue.async { [weak self] in
+            guard let self = self else { return }
+
+            // Check cache (read-only, no update needed on cache hit for performance)
+            if let entry = self.cache[url] {
+                DispatchQueue.main.async { completion(entry.waveform) }
+                return
+            }
+
+            guard let computed = self.computeWaveform(url: url, bins: bins) else {
+                DispatchQueue.main.async { completion([]) }
+                return
+            }
+
+            self.queue.async(flags: .barrier) { [weak self] in
+                guard let self = self else { return }
+
+                // Evict oldest entry if cache is full
+                if self.cache.count >= self.maxCacheSize {
+                    if let oldest = self.cache.min(by: { $0.value.lastAccess < $1.value.lastAccess }) {
+                        self.cache.removeValue(forKey: oldest.key)
+                    }
+                }
+
+                self.cache[url] = (computed, Date())
+            }
+            DispatchQueue.main.async { completion(computed) }
+        }
+    }
+
+    func purge(url: URL) {
+        queue.async(flags: .barrier) { [weak self] in
+            self?.cache.removeValue(forKey: url)
+        }
+    }
+
+    func purgeAll() {
+        queue.async(flags: .barrier) { [weak self] in
+            self?.cache.removeAll()
+        }
+    }
+
+    private func computeWaveform(url: URL, bins: Int) -> [Float]? {
+        guard bins > 0 else { return nil }
+        // Use autoreleasepool to manage memory from audio buffer allocations
+        return autoreleasepool {
+            do {
+                let audioFile = try AVAudioFile(forReading: url)
+                let length = Int(audioFile.length)
+                guard length > 0 else { return nil }
+
+                guard let buffer = AVAudioPCMBuffer(pcmFormat: audioFile.processingFormat, frameCapacity: AVAudioFrameCount(length)) else {
+                    return nil
+                }
+                try audioFile.read(into: buffer, frameCount: AVAudioFrameCount(length))
+                guard let channelData = buffer.floatChannelData else { return nil }
+
+                let channelCount = Int(audioFile.processingFormat.channelCount)
+                let frameLength = Int(buffer.frameLength)
+                let samplesPerBin = max(1, frameLength / bins)
+
+                var magnitudes: [Float] = Array(repeating: 0, count: bins)
+                for bin in 0..<bins {
+                    let start = bin * samplesPerBin
+                    let end = min(frameLength, start + samplesPerBin)
+                    if start >= end { break }
+
+                    var sum: Float = 0
+                    var sampleCount = 0
+                    for frame in start..<end {
+                        var sampleValue: Float = 0
+                        for channel in 0..<channelCount {
+                            sampleValue += fabsf(channelData[channel][frame])
+                        }
+                        sum += sampleValue / Float(channelCount)
+                        sampleCount += 1
+                    }
+                    magnitudes[bin] = sampleCount > 0 ? sum / Float(sampleCount) : 0
+                }
+
+                if let maxMagnitude = magnitudes.max(), maxMagnitude > 0 {
+                    magnitudes = magnitudes.map { min($0 / maxMagnitude, 1.0) }
+                }
+                return magnitudes
+            } catch {
+                SecureLogger.error("Waveform extraction failed for \(url.lastPathComponent): \(error)", category: .session)
+                return nil
+            }
+        }
+    }
+}

bitchat/Identity/IdentityModels.swift

@@ -87,7 +87,7 @@ import Foundation
 /// Represents the ephemeral layer of identity - short-lived peer IDs that provide network privacy.
 /// These IDs rotate periodically to prevent tracking while maintaining cryptographic relationships.
 struct EphemeralIdentity {
-    let peerID: String          // 8 random bytes
+    let peerID: PeerID          // 8 random bytes
     let sessionStart: Date
     var handshakeState: HandshakeState
 }
@@ -106,6 +106,8 @@ enum HandshakeState {
 struct CryptographicIdentity: Codable {
     let fingerprint: String     // SHA256 of public key
     let publicKey: Data         // Noise static public key
+    // Optional Ed25519 signing public key (used to authenticate public messages)
+    var signingPublicKey: Data? = nil
     let firstSeen: Date
     let lastHandshake: Date?
 }
@@ -149,77 +151,14 @@ struct IdentityCache: Codable {
     // Last interaction timestamps (privacy: optional)
     var lastInteractions: [String: Date] = [:] 
     
+    // Blocked Nostr pubkeys (lowercased hex) for geohash chats
+    var blockedNostrPubkeys: Set<String> = []
+    
     // Schema version for future migrations
     var version: Int = 1
 }
 
-// MARK: - Identity Resolution
-
-enum IdentityHint {
-    case unknown
-    case likelyKnown(fingerprint: String)
-    case ambiguous(candidates: Set<String>)
-    case verified(fingerprint: String)
-}
-
-// MARK: - Pending Actions
-
-struct PendingActions {
-    var toggleFavorite: Bool?
-    var setTrustLevel: TrustLevel?
-    var setPetname: String?
-}
-
-// MARK: - Privacy Settings
-
-struct PrivacySettings: Codable {
-    // Level 1: Maximum privacy (default)
-    var persistIdentityCache = false
-    var showLastSeen = false
-    
-    // Level 2: Convenience
-    var autoAcceptKnownFingerprints = false
-    var rememberNicknameHistory = false
-    
-    // Level 3: Social
-    var shareTrustNetworkHints = false  // "3 mutual contacts trust this person"
-}
-
-// MARK: - Conflict Resolution
-
-/// Strategies for resolving identity conflicts in the decentralized network.
-/// Handles cases where multiple peers claim the same nickname or when
-/// identity mappings become ambiguous due to network partitions.
-enum ConflictResolution {
-    case acceptNew(petname: String)      // "John (2)"
-    case rejectNew
-    case blockFingerprint(String)
-    case alertUser(message: String)
-}
-
-// MARK: - UI State
-
-struct PeerUIState {
-    let peerID: String
-    let nickname: String
-    var identityState: IdentityState
-    var connectionQuality: ConnectionQuality
-    
-    enum IdentityState {
-        case unknown                    // Gray - No identity info
-        case unverifiedKnown(String)   // Blue - Handshake done, matches cache
-        case verified(String)          // Green - Cryptographically verified
-        case conflict(String, String)  // Red - Nickname doesn't match fingerprint
-        case pending                   // Yellow - Handshake in progress
-    }
-}
-
-enum ConnectionQuality {
-    case excellent
-    case good
-    case poor
-    case disconnected
-}
+//
 
 // MARK: - Migration Support
-// Removed LegacyFavorite - no longer needed
+//

bitchat/Identity/SecureIdentityStateManager.swift

@@ -90,27 +90,63 @@
 /// - Advanced conflict resolution
 ///
 
+import BitLogger
 import Foundation
 import CryptoKit
 
+protocol SecureIdentityStateManagerProtocol {
+    // MARK: Secure Loading/Saving
+    func forceSave()
+    
+    // MARK: Social Identity Management
+    func getSocialIdentity(for fingerprint: String) -> SocialIdentity?
+    
+    // MARK: Cryptographic Identities
+    func upsertCryptographicIdentity(fingerprint: String, noisePublicKey: Data, signingPublicKey: Data?, claimedNickname: String?)
+    func getCryptoIdentitiesByPeerIDPrefix(_ peerID: PeerID) -> [CryptographicIdentity]
+    func updateSocialIdentity(_ identity: SocialIdentity)
+    
+    // MARK: Favorites Management
+    func getFavorites() -> Set<String>
+    func setFavorite(_ fingerprint: String, isFavorite: Bool)
+    func isFavorite(fingerprint: String) -> Bool
+    
+    // MARK: Blocked Users Management
+    func isBlocked(fingerprint: String) -> Bool
+    func setBlocked(_ fingerprint: String, isBlocked: Bool)
+    
+    // MARK: Geohash (Nostr) Blocking
+    func isNostrBlocked(pubkeyHexLowercased: String) -> Bool
+    func setNostrBlocked(_ pubkeyHexLowercased: String, isBlocked: Bool)
+    func getBlockedNostrPubkeys() -> Set<String>
+    
+    // MARK: Ephemeral Session Management
+    func registerEphemeralSession(peerID: PeerID, handshakeState: HandshakeState)
+    func updateHandshakeState(peerID: PeerID, state: HandshakeState)
+    
+    // MARK: Cleanup
+    func clearAllIdentityData()
+    func removeEphemeralSession(peerID: PeerID)
+    
+    // MARK: Verification
+    func setVerified(fingerprint: String, verified: Bool)
+    func isVerified(fingerprint: String) -> Bool
+    func getVerifiedFingerprints() -> Set<String>
+}
+
 /// Singleton manager for secure identity state persistence and retrieval.
 /// Provides thread-safe access to identity mappings with encryption at rest.
 /// All identity data is stored encrypted in the device Keychain for security.
-class SecureIdentityStateManager {
-    static let shared = SecureIdentityStateManager()
-    
-    private let keychain = KeychainManager.shared
+final class SecureIdentityStateManager: SecureIdentityStateManagerProtocol {
+    private let keychain: KeychainManagerProtocol
     private let cacheKey = "bitchat.identityCache.v2"
     private let encryptionKeyName = "identityCacheEncryptionKey"
     
     // In-memory state
-    private var ephemeralSessions: [String: EphemeralIdentity] = [:]
+    private var ephemeralSessions: [PeerID: EphemeralIdentity] = [:]
     private var cryptographicIdentities: [String: CryptographicIdentity] = [:]
     private var cache: IdentityCache = IdentityCache()
     
-    // Pending actions before handshake
-    private var pendingActions: [String: PendingActions] = [:]
-    
     // Thread safety
     private let queue = DispatchQueue(label: "bitchat.identity.state", attributes: .concurrent)
     
@@ -122,14 +158,16 @@ class SecureIdentityStateManager {
     // Encryption key
     private let encryptionKey: SymmetricKey
     
-    private init() {
+    init(_ keychain: KeychainManagerProtocol) {
+        self.keychain = keychain
+        
         // Generate or retrieve encryption key from keychain
         let loadedKey: SymmetricKey
         
         // Try to load from keychain
         if let keyData = keychain.getIdentityKey(forKey: encryptionKeyName) {
             loadedKey = SymmetricKey(data: keyData)
-            SecureLogger.logKeyOperation("load", keyType: "identity cache encryption key", success: true)
+            SecureLogger.logKeyOperation(.load, keyType: "identity cache encryption key", success: true)
         }
         // Generate new key if needed
         else {
@@ -137,7 +175,7 @@ class SecureIdentityStateManager {
             let keyData = loadedKey.withUnsafeBytes { Data($0) }
             // Save to keychain
             let saved = keychain.saveIdentityKey(keyData, forKey: encryptionKeyName)
-            SecureLogger.logKeyOperation("generate", keyType: "identity cache encryption key", success: saved)
+            SecureLogger.logKeyOperation(.generate, keyType: "identity cache encryption key", success: saved)
         }
         
         self.encryptionKey = loadedKey
@@ -146,9 +184,13 @@ class SecureIdentityStateManager {
         loadIdentityCache()
     }
     
+    deinit {
+        forceSave()
+    }
+    
     // MARK: - Secure Loading/Saving
     
-    func loadIdentityCache() {
+    private func loadIdentityCache() {
         guard let encryptedData = keychain.getIdentityKey(forKey: cacheKey) else {
             // No existing cache, start fresh
             return
@@ -160,16 +202,11 @@ class SecureIdentityStateManager {
             cache = try JSONDecoder().decode(IdentityCache.self, from: decryptedData)
         } catch {
             // Log error but continue with empty cache
-            SecureLogger.logError(error, context: "Failed to load identity cache", category: SecureLogger.security)
+            SecureLogger.error(error, context: "Failed to load identity cache", category: .security)
         }
     }
     
-    deinit {
-        // Force save any pending changes
-        forceSave()
-    }
-    
-    func saveIdentityCache() {
+    private func saveIdentityCache() {
         // Mark that we need to save
         pendingSave = true
         
@@ -191,35 +228,17 @@ class SecureIdentityStateManager {
             let sealedBox = try AES.GCM.seal(data, using: encryptionKey)
             let saved = keychain.saveIdentityKey(sealedBox.combined!, forKey: cacheKey)
             if saved {
-                SecureLogger.log("Identity cache saved to keychain", category: SecureLogger.security, level: .debug)
+                SecureLogger.debug("Identity cache saved to keychain", category: .security)
             }
         } catch {
-            SecureLogger.logError(error, context: "Failed to save identity cache", category: SecureLogger.security)
+            SecureLogger.error(error, context: "Failed to save identity cache", category: .security)
         }
     }
     
     // Force immediate save (for app termination)
     func forceSave() {
         saveTimer?.invalidate()
-        if pendingSave {
-            performSave()
-        }
-    }
-    
-    // MARK: - Identity Resolution
-    
-    func resolveIdentity(peerID: String, claimedNickname: String) -> IdentityHint {
-        queue.sync {
-            // Check if we have candidates based on nickname
-            if let fingerprints = cache.nicknameIndex[claimedNickname] {
-                if fingerprints.count == 1 {
-                    return .likelyKnown(fingerprint: fingerprints.first!)
-                } else {
-                    return .ambiguous(candidates: fingerprints)
-                }
-            }
-            return .unknown
-        }
+        performSave()
     }
     
     // MARK: - Social Identity Management
@@ -229,10 +248,84 @@ class SecureIdentityStateManager {
             return cache.socialIdentities[fingerprint]
         }
     }
-    
-    func getAllSocialIdentities() -> [SocialIdentity] {
+
+    // MARK: - Cryptographic Identities
+
+    /// Insert or update a cryptographic identity and optionally persist its signing key and claimed nickname.
+    /// - Parameters:
+    ///   - fingerprint: SHA-256 hex of the Noise static public key
+    ///   - noisePublicKey: Noise static public key data
+    ///   - signingPublicKey: Optional Ed25519 signing public key for authenticating public messages
+    ///   - claimedNickname: Optional latest claimed nickname to persist into social identity
+    func upsertCryptographicIdentity(fingerprint: String, noisePublicKey: Data, signingPublicKey: Data?, claimedNickname: String? = nil) {
+        queue.async(flags: .barrier) {
+            let now = Date()
+            if var existing = self.cryptographicIdentities[fingerprint] {
+                // Update keys if changed
+                if existing.publicKey != noisePublicKey {
+                    existing = CryptographicIdentity(
+                        fingerprint: fingerprint,
+                        publicKey: noisePublicKey,
+                        signingPublicKey: signingPublicKey ?? existing.signingPublicKey,
+                        firstSeen: existing.firstSeen,
+                        lastHandshake: now
+                    )
+                    self.cryptographicIdentities[fingerprint] = existing
+                } else {
+                    // Update signing key and lastHandshake
+                    existing.signingPublicKey = signingPublicKey ?? existing.signingPublicKey
+                    let updated = CryptographicIdentity(
+                        fingerprint: existing.fingerprint,
+                        publicKey: existing.publicKey,
+                        signingPublicKey: existing.signingPublicKey,
+                        firstSeen: existing.firstSeen,
+                        lastHandshake: now
+                    )
+                    self.cryptographicIdentities[fingerprint] = updated
+                }
+                // Persist updated state (already assigned in branches above)
+            } else {
+                // New entry
+                let entry = CryptographicIdentity(
+                    fingerprint: fingerprint,
+                    publicKey: noisePublicKey,
+                    signingPublicKey: signingPublicKey,
+                    firstSeen: now,
+                    lastHandshake: now
+                )
+                self.cryptographicIdentities[fingerprint] = entry
+            }
+
+            // Optionally persist claimed nickname into social identity
+            if let claimed = claimedNickname {
+                var identity = self.cache.socialIdentities[fingerprint] ?? SocialIdentity(
+                    fingerprint: fingerprint,
+                    localPetname: nil,
+                    claimedNickname: claimed,
+                    trustLevel: .unknown,
+                    isFavorite: false,
+                    isBlocked: false,
+                    notes: nil
+                )
+                // Update claimed nickname if changed
+                if identity.claimedNickname != claimed {
+                    identity.claimedNickname = claimed
+                    self.cache.socialIdentities[fingerprint] = identity
+                } else if self.cache.socialIdentities[fingerprint] == nil {
+                    self.cache.socialIdentities[fingerprint] = identity
+                }
+            }
+
+            self.saveIdentityCache()
+        }
+    }
+
+    /// Find cryptographic identities whose fingerprint prefix matches a peerID (16-hex) short ID
+    func getCryptoIdentitiesByPeerIDPrefix(_ peerID: PeerID) -> [CryptographicIdentity] {
         queue.sync {
-            return Array(cache.socialIdentities.values)
+            // Defensive: ensure hex and correct length
+            guard peerID.isShort else { return [] }
+            return cryptographicIdentities.values.filter { $0.fingerprint.hasPrefix(peerID.id) }
         }
     }
     
@@ -310,7 +403,7 @@ class SecureIdentityStateManager {
     }
     
     func setBlocked(_ fingerprint: String, isBlocked: Bool) {
-        SecureLogger.log("User \(isBlocked ? "blocked" : "unblocked"): \(fingerprint)", category: SecureLogger.security, level: .info)
+        SecureLogger.info("User \(isBlocked ? "blocked" : "unblocked"): \(fingerprint)", category: .security)
         
         queue.async(flags: .barrier) {
             if var identity = self.cache.socialIdentities[fingerprint] {
@@ -335,10 +428,34 @@ class SecureIdentityStateManager {
             self.saveIdentityCache()
         }
     }
+
+    // MARK: - Geohash (Nostr) Blocking
+    
+    func isNostrBlocked(pubkeyHexLowercased: String) -> Bool {
+        queue.sync {
+            return cache.blockedNostrPubkeys.contains(pubkeyHexLowercased.lowercased())
+        }
+    }
+    
+    func setNostrBlocked(_ pubkeyHexLowercased: String, isBlocked: Bool) {
+        let key = pubkeyHexLowercased.lowercased()
+        queue.async(flags: .barrier) {
+            if isBlocked {
+                self.cache.blockedNostrPubkeys.insert(key)
+            } else {
+                self.cache.blockedNostrPubkeys.remove(key)
+            }
+            self.saveIdentityCache()
+        }
+    }
+    
+    func getBlockedNostrPubkeys() -> Set<String> {
+        queue.sync { cache.blockedNostrPubkeys }
+    }
     
     // MARK: - Ephemeral Session Management
     
-    func registerEphemeralSession(peerID: String, handshakeState: HandshakeState = .none) {
+    func registerEphemeralSession(peerID: PeerID, handshakeState: HandshakeState = .none) {
         queue.async(flags: .barrier) {
             self.ephemeralSessions[peerID] = EphemeralIdentity(
                 peerID: peerID,
@@ -348,7 +465,7 @@ class SecureIdentityStateManager {
         }
     }
     
-    func updateHandshakeState(peerID: String, state: HandshakeState) {
+    func updateHandshakeState(peerID: PeerID, state: HandshakeState) {
         queue.async(flags: .barrier) {
             self.ephemeralSessions[peerID]?.handshakeState = state
             
@@ -360,81 +477,32 @@ class SecureIdentityStateManager {
         }
     }
     
-    func getHandshakeState(peerID: String) -> HandshakeState? {
-        queue.sync {
-            return ephemeralSessions[peerID]?.handshakeState
-        }
-    }
-    
-    // MARK: - Pending Actions
-    
-    func setPendingAction(peerID: String, action: PendingActions) {
-        queue.async(flags: .barrier) {
-            self.pendingActions[peerID] = action
-        }
-    }
-    
-    func applyPendingActions(peerID: String, fingerprint: String) {
-        queue.async(flags: .barrier) {
-            guard let actions = self.pendingActions[peerID] else { return }
-            
-            // Get or create social identity
-            var identity = self.cache.socialIdentities[fingerprint] ?? SocialIdentity(
-                fingerprint: fingerprint,
-                localPetname: nil,
-                claimedNickname: "Unknown",
-                trustLevel: .unknown,
-                isFavorite: false,
-                isBlocked: false,
-                notes: nil
-            )
-            
-            // Apply pending actions
-            if let toggleFavorite = actions.toggleFavorite {
-                identity.isFavorite = toggleFavorite
-            }
-            if let trustLevel = actions.setTrustLevel {
-                identity.trustLevel = trustLevel
-            }
-            if let petname = actions.setPetname {
-                identity.localPetname = petname
-            }
-            
-            // Save updated identity
-            self.cache.socialIdentities[fingerprint] = identity
-            self.pendingActions.removeValue(forKey: peerID)
-            self.saveIdentityCache()
-        }
-    }
-    
     // MARK: - Cleanup
     
     func clearAllIdentityData() {
-        SecureLogger.log("Clearing all identity data", category: SecureLogger.security, level: .warning)
+        SecureLogger.warning("Clearing all identity data", category: .security)
         
         queue.async(flags: .barrier) {
             self.cache = IdentityCache()
             self.ephemeralSessions.removeAll()
             self.cryptographicIdentities.removeAll()
-            self.pendingActions.removeAll()
             
             // Delete from keychain
             let deleted = self.keychain.deleteIdentityKey(forKey: self.cacheKey)
-            SecureLogger.logKeyOperation("delete", keyType: "identity cache", success: deleted)
+            SecureLogger.logKeyOperation(.delete, keyType: "identity cache", success: deleted)
         }
     }
     
-    func removeEphemeralSession(peerID: String) {
+    func removeEphemeralSession(peerID: PeerID) {
         queue.async(flags: .barrier) {
             self.ephemeralSessions.removeValue(forKey: peerID)
-            self.pendingActions.removeValue(forKey: peerID)
         }
     }
     
     // MARK: - Verification
     
     func setVerified(fingerprint: String, verified: Bool) {
-        SecureLogger.log("Fingerprint \(verified ? "verified" : "unverified"): \(fingerprint)", category: SecureLogger.security, level: .info)
+        SecureLogger.info("Fingerprint \(verified ? "verified" : "unverified"): \(fingerprint)", category: .security)
         
         queue.async(flags: .barrier) {
             if verified {
@@ -464,4 +532,4 @@ class SecureIdentityStateManager {
             return cache.verifiedFingerprints
         }
     }
-}
+}

bitchat/Info.plist

@@ -35,37 +35,26 @@
 	<string>bitchat uses Bluetooth to create a secure mesh network for chatting with nearby users.</string>
 	<key>NSBluetoothPeripheralUsageDescription</key>
 	<string>bitchat uses Bluetooth to discover and connect with other bitchat users nearby.</string>
+	<key>NSCameraUsageDescription</key>
+	<string>bitchat uses the camera to scan QR codes to verify peers.</string>
+	<key>NSPhotoLibraryUsageDescription</key>
+	<string>bitchat lets you pick images from your photo library to share with nearby peers.</string>
+	<key>NSMicrophoneUsageDescription</key>
+	<string>bitchat uses the microphone to record voice notes that relay across the mesh.</string>
+	<key>NSLocationWhenInUseUsageDescription</key>
+	<string>bitchat uses your approximate location to compute local geohash channels for optional public chats. Exact GPS is never shared.</string>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>bluetooth-central</string>
 		<string>bluetooth-peripheral</string>
-		<string>remote-notification</string>
 	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
+	<key>UIRequiresFullScreen</key>
+	<true/>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>
 	</array>
-	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationPortraitUpsideDown</string>
-	</array>
-	<key>NSAppTransportSecurity</key>
-	<dict>
-		<key>NSAllowsArbitraryLoads</key>
-		<false/>
-		<key>NSAllowsArbitraryLoadsForMedia</key>
-		<false/>
-		<key>NSAllowsArbitraryLoadsInWebContent</key>
-		<false/>
-		<key>NSAllowsLocalNetworking</key>
-		<true/>
-	</dict>
-	<key>NSLocalNetworkUsageDescription</key>
-	<string>bitchat uses local network access to discover and connect with other bitchat users on your network.</string>
 </dict>
 </plist>

bitchat/LaunchScreen.storyboard

@@ -37,4 +37,4 @@
             <point key="canvasLocation" x="53" y="375"/>
         </scene>
     </scenes>
-</document>
+</document>

bitchat/Models/BitchatMessage.swift

@@ -0,0 +1,355 @@
+//
+// BitchatMessage.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+/// Represents a user-visible message in the BitChat system.
+/// Handles both broadcast messages and private encrypted messages,
+/// with support for mentions, replies, and delivery tracking.
+/// - Note: This is the primary data model for chat messages
+final class BitchatMessage: Codable {
+    let id: String
+    let sender: String
+    let content: String
+    let timestamp: Date
+    let isRelay: Bool
+    let originalSender: String?
+    let isPrivate: Bool
+    let recipientNickname: String?
+    let senderPeerID: PeerID?
+    let mentions: [String]?  // Array of mentioned nicknames
+    var deliveryStatus: DeliveryStatus? // Delivery tracking
+    
+    // Cached formatted text (not included in Codable)
+    private var _cachedFormattedText: [String: AttributedString] = [:]
+    
+    func getCachedFormattedText(isDark: Bool, isSelf: Bool) -> AttributedString? {
+        return _cachedFormattedText["\(isDark)-\(isSelf)"]
+    }
+    
+    func setCachedFormattedText(_ text: AttributedString, isDark: Bool, isSelf: Bool) {
+        _cachedFormattedText["\(isDark)-\(isSelf)"] = text
+    }
+    
+    // Codable implementation
+    enum CodingKeys: String, CodingKey {
+        case id, sender, content, timestamp, isRelay, originalSender
+        case isPrivate, recipientNickname, senderPeerID, mentions, deliveryStatus
+    }
+    
+    init(
+        id: String? = nil,
+        sender: String,
+        content: String,
+        timestamp: Date,
+        isRelay: Bool,
+        originalSender: String? = nil,
+        isPrivate: Bool = false,
+        recipientNickname: String? = nil,
+        senderPeerID: PeerID? = nil,
+        mentions: [String]? = nil,
+        deliveryStatus: DeliveryStatus? = nil
+    ) {
+        self.id = id ?? UUID().uuidString
+        self.sender = sender
+        self.content = content
+        self.timestamp = timestamp
+        self.isRelay = isRelay
+        self.originalSender = originalSender
+        self.isPrivate = isPrivate
+        self.recipientNickname = recipientNickname
+        self.senderPeerID = senderPeerID
+        self.mentions = mentions
+        self.deliveryStatus = deliveryStatus ?? (isPrivate ? .sending : nil)
+    }
+}
+
+// MARK: - Equatable Conformance
+
+extension BitchatMessage: Equatable {
+    static func == (lhs: BitchatMessage, rhs: BitchatMessage) -> Bool {
+        return lhs.id == rhs.id &&
+               lhs.sender == rhs.sender &&
+               lhs.content == rhs.content &&
+               lhs.timestamp == rhs.timestamp &&
+               lhs.isRelay == rhs.isRelay &&
+               lhs.originalSender == rhs.originalSender &&
+               lhs.isPrivate == rhs.isPrivate &&
+               lhs.recipientNickname == rhs.recipientNickname &&
+               lhs.senderPeerID == rhs.senderPeerID &&
+               lhs.mentions == rhs.mentions &&
+               lhs.deliveryStatus == rhs.deliveryStatus
+    }
+}
+
+// MARK: - Binary encoding
+
+extension BitchatMessage {
+    func toBinaryPayload() -> Data? {
+        var data = Data()
+        
+        // Message format:
+        // - Flags: 1 byte (bit 0: isRelay, bit 1: isPrivate, bit 2: hasOriginalSender, bit 3: hasRecipientNickname, bit 4: hasSenderPeerID, bit 5: hasMentions)
+        // - Timestamp: 8 bytes (seconds since epoch)
+        // - ID length: 1 byte
+        // - ID: variable
+        // - Sender length: 1 byte
+        // - Sender: variable
+        // - Content length: 2 bytes
+        // - Content: variable
+        // Optional fields based on flags:
+        // - Original sender length + data
+        // - Recipient nickname length + data
+        // - Sender peer ID length + data
+        // - Mentions array
+        
+        var flags: UInt8 = 0
+        if isRelay { flags |= 0x01 }
+        if isPrivate { flags |= 0x02 }
+        if originalSender != nil { flags |= 0x04 }
+        if recipientNickname != nil { flags |= 0x08 }
+        if senderPeerID != nil { flags |= 0x10 }
+        if mentions != nil && !mentions!.isEmpty { flags |= 0x20 }
+        
+        data.append(flags)
+        
+        // Timestamp (in milliseconds)
+        let timestampMillis = UInt64(timestamp.timeIntervalSince1970 * 1000)
+        // Encode as 8 bytes, big-endian
+        for i in (0..<8).reversed() {
+            data.append(UInt8((timestampMillis >> (i * 8)) & 0xFF))
+        }
+        
+        // ID
+        if let idData = id.data(using: .utf8) {
+            data.append(UInt8(min(idData.count, 255)))
+            data.append(idData.prefix(255))
+        } else {
+            data.append(0)
+        }
+        
+        // Sender
+        if let senderData = sender.data(using: .utf8) {
+            data.append(UInt8(min(senderData.count, 255)))
+            data.append(senderData.prefix(255))
+        } else {
+            data.append(0)
+        }
+        
+        // Content
+        if let contentData = content.data(using: .utf8) {
+            let length = UInt16(min(contentData.count, 65535))
+            // Encode length as 2 bytes, big-endian
+            data.append(UInt8((length >> 8) & 0xFF))
+            data.append(UInt8(length & 0xFF))
+            data.append(contentData.prefix(Int(length)))
+        } else {
+            data.append(contentsOf: [0, 0])
+        }
+        
+        // Optional fields
+        if let originalSender = originalSender, let origData = originalSender.data(using: .utf8) {
+            data.append(UInt8(min(origData.count, 255)))
+            data.append(origData.prefix(255))
+        }
+        
+        if let recipientNickname = recipientNickname, let recipData = recipientNickname.data(using: .utf8) {
+            data.append(UInt8(min(recipData.count, 255)))
+            data.append(recipData.prefix(255))
+        }
+        
+        if let peerData = senderPeerID?.id.data(using: .utf8) {
+            data.append(UInt8(min(peerData.count, 255)))
+            data.append(peerData.prefix(255))
+        }
+        
+        // Mentions array
+        if let mentions = mentions {
+            data.append(UInt8(min(mentions.count, 255))) // Number of mentions
+            for mention in mentions.prefix(255) {
+                if let mentionData = mention.data(using: .utf8) {
+                    data.append(UInt8(min(mentionData.count, 255)))
+                    data.append(mentionData.prefix(255))
+                } else {
+                    data.append(0)
+                }
+            }
+        }
+        
+        
+        return data
+    }
+    
+    convenience init?(_ data: Data) {
+        // Create an immutable copy to prevent threading issues
+        let dataCopy = Data(data)
+        
+        
+        guard dataCopy.count >= 13 else {
+            return nil
+        }
+        
+        var offset = 0
+        
+        // Flags
+        guard offset < dataCopy.count else {
+            return nil
+        }
+        let flags = dataCopy[offset]; offset += 1
+        let isRelay = (flags & 0x01) != 0
+        let isPrivate = (flags & 0x02) != 0
+        let hasOriginalSender = (flags & 0x04) != 0
+        let hasRecipientNickname = (flags & 0x08) != 0
+        let hasSenderPeerID = (flags & 0x10) != 0
+        let hasMentions = (flags & 0x20) != 0
+        
+        // Timestamp
+        guard offset + 8 <= dataCopy.count else {
+            return nil
+        }
+        let timestampData = dataCopy[offset..<offset+8]
+        let timestampMillis = timestampData.reduce(0) { result, byte in
+            (result << 8) | UInt64(byte)
+        }
+        offset += 8
+        let timestamp = Date(timeIntervalSince1970: TimeInterval(timestampMillis) / 1000.0)
+        
+        // ID
+        guard offset < dataCopy.count else {
+            return nil
+        }
+        let idLength = Int(dataCopy[offset]); offset += 1
+        guard offset + idLength <= dataCopy.count else {
+            return nil
+        }
+        let id = String(data: dataCopy[offset..<offset+idLength], encoding: .utf8) ?? UUID().uuidString
+        offset += idLength
+        
+        // Sender
+        guard offset < dataCopy.count else {
+            return nil
+        }
+        let senderLength = Int(dataCopy[offset]); offset += 1
+        guard offset + senderLength <= dataCopy.count else {
+            return nil
+        }
+        let sender = String(data: dataCopy[offset..<offset+senderLength], encoding: .utf8) ?? "unknown"
+        offset += senderLength
+        
+        // Content
+        guard offset + 2 <= dataCopy.count else {
+            return nil
+        }
+        let contentLengthData = dataCopy[offset..<offset+2]
+        let contentLength = Int(contentLengthData.reduce(0) { result, byte in
+            (result << 8) | UInt16(byte)
+        })
+        offset += 2
+        guard offset + contentLength <= dataCopy.count else {
+            return nil
+        }
+        
+        let content = String(data: dataCopy[offset..<offset+contentLength], encoding: .utf8) ?? ""
+        offset += contentLength
+        
+        // Optional fields
+        var originalSender: String?
+        if hasOriginalSender && offset < dataCopy.count {
+            let length = Int(dataCopy[offset]); offset += 1
+            if offset + length <= dataCopy.count {
+                originalSender = String(data: dataCopy[offset..<offset+length], encoding: .utf8)
+                offset += length
+            }
+        }
+        
+        var recipientNickname: String?
+        if hasRecipientNickname && offset < dataCopy.count {
+            let length = Int(dataCopy[offset]); offset += 1
+            if offset + length <= dataCopy.count {
+                recipientNickname = String(data: dataCopy[offset..<offset+length], encoding: .utf8)
+                offset += length
+            }
+        }
+        
+        var senderPeerID: PeerID?
+        if hasSenderPeerID && offset < dataCopy.count {
+            let length = Int(dataCopy[offset]); offset += 1
+            if offset + length <= dataCopy.count {
+                senderPeerID = PeerID(data: dataCopy[offset..<offset+length])
+                offset += length
+            }
+        }
+        
+        // Mentions array
+        var mentions: [String]?
+        if hasMentions && offset < dataCopy.count {
+            let mentionCount = Int(dataCopy[offset]); offset += 1
+            if mentionCount > 0 {
+                mentions = []
+                for _ in 0..<mentionCount {
+                    if offset < dataCopy.count {
+                        let length = Int(dataCopy[offset]); offset += 1
+                        if offset + length <= dataCopy.count {
+                            if let mention = String(data: dataCopy[offset..<offset+length], encoding: .utf8) {
+                                mentions?.append(mention)
+                            }
+                            offset += length
+                        }
+                    }
+                }
+            }
+        }
+        
+        self.init(
+            id: id,
+            sender: sender,
+            content: content,
+            timestamp: timestamp,
+            isRelay: isRelay,
+            originalSender: originalSender,
+            isPrivate: isPrivate,
+            recipientNickname: recipientNickname,
+            senderPeerID: senderPeerID,
+            mentions: mentions
+        )
+    }
+}
+
+// MARK: - Helpers
+
+extension BitchatMessage {
+    
+    private static let timestampFormatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "HH:mm:ss"
+        return formatter
+    }()
+    
+    var formattedTimestamp: String {
+        Self.timestampFormatter.string(from: timestamp)
+    }
+}
+
+extension Array where Element == BitchatMessage {
+    /// Filters out empty ones and deduplicate by ID while preserving order (from oldest to newest)
+    func cleanedAndDeduped() -> [Element] {
+        let arr = filter { $0.content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false }
+        guard arr.count > 1 else {
+            return arr
+        }
+        var seen = Set<String>()
+        var dedup: [BitchatMessage] = []
+        for m in arr.sorted(by: { $0.timestamp < $1.timestamp }) {
+            if !seen.contains(m.id) {
+                dedup.append(m)
+                seen.insert(m.id)
+            }
+        }
+        return dedup
+    }
+}

bitchat/Models/BitchatPacket.swift

@@ -0,0 +1,96 @@
+//
+// BitchatPacket.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+/// The core packet structure for all BitChat protocol messages.
+/// Encapsulates all data needed for routing through the mesh network,
+/// including TTL for hop limiting and optional encryption.
+/// - Note: Packets larger than BLE MTU (512 bytes) are automatically fragmented
+struct BitchatPacket: Codable {
+    let version: UInt8
+    let type: UInt8
+    let senderID: Data
+    let recipientID: Data?
+    let timestamp: UInt64
+    let payload: Data
+    var signature: Data?
+    var ttl: UInt8
+    var route: [Data]?
+    
+    init(type: UInt8, senderID: Data, recipientID: Data?, timestamp: UInt64, payload: Data, signature: Data?, ttl: UInt8, version: UInt8 = 1, route: [Data]? = nil) {
+        self.version = version
+        self.type = type
+        self.senderID = senderID
+        self.recipientID = recipientID
+        self.timestamp = timestamp
+        self.payload = payload
+        self.signature = signature
+        self.ttl = ttl
+        self.route = route
+    }
+    
+    // Convenience initializer for new binary format
+    init(type: UInt8, ttl: UInt8, senderID: PeerID, payload: Data) {
+        self.version = 1
+        self.type = type
+        // Convert hex string peer ID to binary data (8 bytes)
+        var senderData = Data()
+        var tempID = senderID.id
+        while tempID.count >= 2 {
+            let hexByte = String(tempID.prefix(2))
+            if let byte = UInt8(hexByte, radix: 16) {
+                senderData.append(byte)
+            }
+            tempID = String(tempID.dropFirst(2))
+        }
+        self.senderID = senderData
+        self.recipientID = nil
+        self.timestamp = UInt64(Date().timeIntervalSince1970 * 1000) // milliseconds
+        self.payload = payload
+        self.signature = nil
+        self.ttl = ttl
+        self.route = nil
+    }
+    
+    var data: Data? {
+        BinaryProtocol.encode(self)
+    }
+    
+    func toBinaryData(padding: Bool = true) -> Data? {
+        BinaryProtocol.encode(self, padding: padding)
+    }
+
+    // Backward-compatible helper (defaults to padded encoding)
+    func toBinaryData() -> Data? {
+        toBinaryData(padding: true)
+    }
+    
+    /// Create binary representation for signing (without signature and TTL fields)
+    /// TTL is excluded because it changes during packet relay operations
+    func toBinaryDataForSigning() -> Data? {
+        // Create a copy without signature and with fixed TTL for signing
+        // TTL must be excluded because it changes during relay
+        let unsignedPacket = BitchatPacket(
+            type: type,
+            senderID: senderID,
+            recipientID: recipientID,
+            timestamp: timestamp,
+            payload: payload,
+            signature: nil, // Remove signature for signing
+            ttl: 0, // Use fixed TTL=0 for signing to ensure relay compatibility
+            version: version,
+            route: route
+        )
+        return BinaryProtocol.encode(unsignedPacket)
+    }
+    
+    static func from(_ data: Data) -> BitchatPacket? {
+        BinaryProtocol.decode(data)
+    }
+}

bitchat/Models/BitchatPeer.swift

@@ -2,12 +2,13 @@ import Foundation
 import CoreBluetooth
 
 /// Represents a peer in the BitChat network with all associated metadata
-struct BitchatPeer: Identifiable, Equatable {
-    let id: String // Hex-encoded peer ID
+struct BitchatPeer: Equatable {
+    let peerID: PeerID // Hex-encoded peer ID
     let noisePublicKey: Data
     let nickname: String
     let lastSeen: Date
     let isConnected: Bool
+    let isReachable: Bool
     
     // Favorite-related properties
     var favoriteStatus: FavoritesPersistenceService.FavoriteRelationship?
@@ -18,7 +19,7 @@ struct BitchatPeer: Identifiable, Equatable {
     // Connection state
     enum ConnectionState {
         case bluetoothConnected
-        case relayConnected     // Connected via mesh relay (another peer)
+        case meshReachable      // Seen via mesh recently, not directly connected
         case nostrAvailable     // Mutual favorite, reachable via Nostr
         case offline            // Not connected via any transport
     }
@@ -26,8 +27,8 @@ struct BitchatPeer: Identifiable, Equatable {
     var connectionState: ConnectionState {
         if isConnected {
             return .bluetoothConnected
-        } else if isRelayConnected {
-            return .relayConnected
+        } else if isReachable {
+            return .meshReachable
         } else if favoriteStatus?.isMutual == true {
             // Mutual favorites can communicate via Nostr when offline
             return .nostrAvailable
@@ -36,8 +37,6 @@ struct BitchatPeer: Identifiable, Equatable {
         }
     }
     
-    var isRelayConnected: Bool = false  // Set by PeerManager based on session state
-    
     var isFavorite: Bool {
         favoriteStatus?.isFavorite ?? false
     }
@@ -52,15 +51,15 @@ struct BitchatPeer: Identifiable, Equatable {
     
     // Display helpers
     var displayName: String {
-        nickname.isEmpty ? String(id.prefix(8)) : nickname
+        nickname.isEmpty ? String(peerID.id.prefix(8)) : nickname
     }
     
     var statusIcon: String {
         switch connectionState {
         case .bluetoothConnected:
             return "📻" // Radio icon for mesh connection
-        case .relayConnected:
-            return "🔗" // Chain link for relay connection
+        case .meshReachable:
+            return "📡" // Antenna for mesh reachable
         case .nostrAvailable:
             return "🌐" // Purple globe for Nostr
         case .offline:
@@ -74,19 +73,19 @@ struct BitchatPeer: Identifiable, Equatable {
     
     // Initialize from mesh service data
     init(
-        id: String,
+        peerID: PeerID,
         noisePublicKey: Data,
         nickname: String,
         lastSeen: Date = Date(),
         isConnected: Bool = false,
-        isRelayConnected: Bool = false
+        isReachable: Bool = false
     ) {
-        self.id = id
+        self.peerID = peerID
         self.noisePublicKey = noisePublicKey
         self.nickname = nickname
         self.lastSeen = lastSeen
         self.isConnected = isConnected
-        self.isRelayConnected = isRelayConnected
+        self.isReachable = isReachable
         
         // Load favorite status - will be set later by the manager
         self.favoriteStatus = nil
@@ -94,243 +93,6 @@ struct BitchatPeer: Identifiable, Equatable {
     }
     
     static func == (lhs: BitchatPeer, rhs: BitchatPeer) -> Bool {
-        lhs.id == rhs.id
+        lhs.peerID == rhs.peerID
     }
 }
-
-// MARK: - Peer Manager
-
-/// Manages the collection of peers and their states
-@MainActor
-class PeerManager: ObservableObject {
-    @Published var peers: [BitchatPeer] = []
-    @Published var favorites: [BitchatPeer] = []
-    @Published var mutualFavorites: [BitchatPeer] = []
-    
-    private let meshService: BluetoothMeshService
-    private let favoritesService = FavoritesPersistenceService.shared
-    
-    init(meshService: BluetoothMeshService) {
-        self.meshService = meshService
-        updatePeers()
-        
-        // Listen for updates
-        NotificationCenter.default.addObserver(
-            self,
-            selector: #selector(handleFavoriteChanged),
-            name: .favoriteStatusChanged,
-            object: nil
-        )
-    }
-    
-    @objc private func handleFavoriteChanged() {
-        SecureLogger.log("⭐ Favorite status changed notification received, updating peers", 
-                        category: SecureLogger.session, level: .debug)
-        updatePeers()
-    }
-    
-    deinit {
-        NotificationCenter.default.removeObserver(self)
-    }
-    
-    func updatePeers() {
-        // Reduce log verbosity - only log when count changes
-        let previousCount = peers.count
-        
-        // Get current mesh peers
-        let meshPeers = meshService.getPeerNicknames()
-        
-        // Build peer list
-        var allPeers: [BitchatPeer] = []
-        var connectedNicknames: Set<String> = []
-        
-        // Add connected mesh peers (only if actually connected or relay connected)
-        for (peerID, nickname) in meshPeers {
-            guard let noiseKey = Data(hexString: peerID) else { continue }
-            
-            // Safety check: Never add our own peer ID
-            if peerID == meshService.myPeerID {
-                SecureLogger.log("⚠️ Skipping self peer ID \(peerID) in peer list", 
-                               category: SecureLogger.session, level: .warning)
-                continue
-            }
-            
-            // Check if this peer is actually connected (not just known via relay)
-            let isConnected = meshService.isPeerConnected(peerID)
-            let isKnown = meshService.isPeerKnown(peerID)
-            // In a mesh network, a peer can only be relay-connected if:
-            // 1. We know about them (have received announce)
-            // 2. We're not directly connected
-            // 3. There are other peers that could relay (mesh peer count > 2)
-            // For now, disable relay detection until we have proper relay tracking
-            let isRelayConnected = false
-            
-            // Debug logging for relay connection detection
-            if isKnown && !isConnected {
-                SecureLogger.log("Peer \(nickname) (\(peerID)): isConnected=\(isConnected), isKnown=\(isKnown), isRelayConnected=\(isRelayConnected)", 
-                               category: SecureLogger.session, level: .debug)
-            }
-            
-            // Skip disconnected peers unless they're favorites (handled later)
-            if !isConnected && !isRelayConnected {
-                continue
-            }
-            
-            if isConnected || isRelayConnected {
-                connectedNicknames.insert(nickname)
-            }
-            
-            var peer = BitchatPeer(
-                id: peerID,
-                noisePublicKey: noiseKey,
-                nickname: nickname,
-                isConnected: isConnected,
-                isRelayConnected: isRelayConnected
-            )
-            // Set favorite status - check both by current noise key and by nickname
-            if let favoriteStatus = favoritesService.getFavoriteStatus(for: noiseKey) {
-                peer.favoriteStatus = favoriteStatus
-                peer.nostrPublicKey = favoriteStatus.peerNostrPublicKey
-            } else {
-                // Check if we have a favorite for this nickname (peer may have reconnected with new ID)
-                let favoriteByNickname = favoritesService.favorites.values.first { $0.peerNickname == nickname }
-                if let favorite = favoriteByNickname {
-                    SecureLogger.log("🔄 Found favorite for '\(nickname)' by nickname, updating noise key", 
-                                    category: SecureLogger.session, level: .info)
-                    // Update the favorite's noise key to match the current connection
-                    favoritesService.updateNoisePublicKey(from: favorite.peerNoisePublicKey, to: noiseKey, peerNickname: nickname)
-                    // Get the updated favorite with the new key
-                    peer.favoriteStatus = favoritesService.getFavoriteStatus(for: noiseKey)
-                    peer.nostrPublicKey = peer.favoriteStatus?.peerNostrPublicKey ?? favorite.peerNostrPublicKey
-                }
-            }
-            allPeers.append(peer)
-        }
-        
-        // Add offline favorites (only those not currently connected/relay-connected AND that we actively favorite)
-        SecureLogger.log("📋 Processing \(favoritesService.favorites.count) favorite relationships (connected/relay nicknames: \(connectedNicknames))", 
-                        category: SecureLogger.session, level: .info)
-        
-        for (favoriteKey, favorite) in favoritesService.favorites {
-            let favoriteID = favorite.peerNoisePublicKey.hexEncodedString()
-            
-            // Skip if this peer is already connected or relay-connected (by nickname)
-            if connectedNicknames.contains(favorite.peerNickname) {
-                SecureLogger.log("  - Skipping '\(favorite.peerNickname)' (key: \(favoriteKey.hexEncodedString())) - already connected/relay-connected", 
-                                category: SecureLogger.session, level: .debug)
-                continue
-            }
-            
-            // Only add peers that WE favorite (not just ones who favorite us)
-            if !favorite.isFavorite {
-                SecureLogger.log("  - Skipping '\(favorite.peerNickname)' - we don't favorite them (they favorite us: \(favorite.theyFavoritedUs))", 
-                                category: SecureLogger.session, level: .debug)
-                continue
-            }
-            
-            // Add this favorite as an offline peer
-            SecureLogger.log("  - Adding offline favorite '\(favorite.peerNickname)' (key: \(favoriteKey.hexEncodedString()), ID: \(favoriteID), mutual: \(favorite.isMutual))", 
-                            category: SecureLogger.session, level: .info)
-            
-            var peer = BitchatPeer(
-                id: favoriteID,
-                noisePublicKey: favorite.peerNoisePublicKey,
-                nickname: favorite.peerNickname,
-                isConnected: false
-            )
-            // Set favorite status
-            peer.favoriteStatus = favorite
-            peer.nostrPublicKey = favorite.peerNostrPublicKey
-            allPeers.append(peer)
-        }
-        
-        // Filter out "Unknown" peers unless they are favorites or have a favorite relationship
-        allPeers = allPeers.filter { peer in
-            !(peer.displayName == "Unknown" && peer.favoriteStatus == nil)
-        }
-        
-        // Sort: Connected first (direct then relay), then favorites, then alphabetical
-        allPeers.sort { lhs, rhs in
-            // Direct connections first
-            if lhs.isConnected != rhs.isConnected {
-                return lhs.isConnected
-            }
-            // Then relay connections
-            if lhs.isRelayConnected != rhs.isRelayConnected {
-                return lhs.isRelayConnected
-            }
-            // Then favorites
-            if lhs.isFavorite != rhs.isFavorite {
-                return lhs.isFavorite
-            }
-            // Finally alphabetical
-            return lhs.displayName < rhs.displayName
-        }
-        
-        // Single pass to compute all subsets and counts
-        var favorites: [BitchatPeer] = []
-        var mutualFavorites: [BitchatPeer] = []
-        var connectedCount = 0
-        var offlineCount = 0
-        
-        for peer in allPeers {
-            if peer.isFavorite {
-                favorites.append(peer)
-            }
-            if peer.isMutualFavorite {
-                mutualFavorites.append(peer)
-            }
-            if peer.isConnected {
-                connectedCount += 1
-            } else {
-                offlineCount += 1
-            }
-        }
-        
-        self.peers = allPeers
-        self.favorites = favorites
-        self.mutualFavorites = mutualFavorites
-        
-        // Always log favorites debug info when there are favorites
-        if favoritesService.favorites.count > 0 {
-            SecureLogger.log("📊 Peer list update: \(allPeers.count) total (\(connectedCount) connected, \(offlineCount) offline), \(favorites.count) favorites, \(mutualFavorites.count) mutual", 
-                            category: SecureLogger.session, level: .info)
-            
-            // Log each peer's status
-            for peer in allPeers {
-                // Use the actual statusIcon from the peer which accounts for relay connections
-                let statusIcon: String
-                switch peer.connectionState {
-                case .bluetoothConnected:
-                    statusIcon = "🟢"
-                case .relayConnected:
-                    statusIcon = "🔗"
-                case .nostrAvailable:
-                    statusIcon = "🌐"
-                case .offline:
-                    statusIcon = "🔴"
-                }
-                let favoriteIcon = peer.isMutualFavorite ? "💕" : (peer.isFavorite ? "⭐" : (peer.theyFavoritedUs ? "🌙" : ""))
-                SecureLogger.log("  \(statusIcon) \(peer.displayName) (ID: \(peer.id.prefix(8))...) \(favoriteIcon)", 
-                                category: SecureLogger.session, level: .debug)
-            }
-        } else if previousCount != allPeers.count {
-            // Only log non-favorite updates if count changed
-            SecureLogger.log("✅ Updated peer list: \(allPeers.count) total peers", 
-                            category: SecureLogger.session, level: .info)
-        }
-    }
-    
-    func toggleFavorite(_ peer: BitchatPeer) {
-        if peer.isFavorite {
-            favoritesService.removeFavorite(peerNoisePublicKey: peer.noisePublicKey)
-        } else {
-            favoritesService.addFavorite(
-                peerNoisePublicKey: peer.noisePublicKey,
-                peerNostrPublicKey: peer.nostrPublicKey,
-                peerNickname: peer.nickname
-            )
-        }
-        updatePeers()
-    }
-}

bitchat/Models/CommandInfo.swift

@@ -0,0 +1,58 @@
+//
+// CommandsInfo.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+// MARK: - CommandInfo Enum
+
+enum CommandInfo: String, Identifiable {
+    case block
+    case clear
+    case hug
+    case message = "dm"
+    case slap
+    case unblock
+    case who
+    case favorite
+    case unfavorite
+    
+    var id: String { rawValue }
+    
+    var alias: String { "/" + rawValue }
+    
+    var placeholder: String? {
+        switch self {
+        case .block, .hug, .message, .slap, .unblock, .favorite, .unfavorite:
+            return "<" + String(localized: "content.input.nickname_placeholder") + ">"
+        case .clear, .who:
+            return nil
+        }
+    }
+    
+    var description: String {
+        switch self {
+        case .block:        String(localized: "content.commands.block")
+        case .clear:        String(localized: "content.commands.clear")
+        case .hug:          String(localized: "content.commands.hug")
+        case .message:      String(localized: "content.commands.message")
+        case .slap:         String(localized: "content.commands.slap")
+        case .unblock:      String(localized: "content.commands.unblock")
+        case .who:          String(localized: "content.commands.who")
+        case .favorite:     String(localized: "content.commands.favorite")
+        case .unfavorite:   String(localized: "content.commands.unfavorite")
+        }
+    }
+    
+    static func all(isGeoPublic: Bool, isGeoDM: Bool) -> [CommandInfo] {
+        let baseCommands: [CommandInfo] = [.block, .unblock, .clear, .hug, .message, .slap, .who]
+        if isGeoPublic || isGeoDM {
+            return baseCommands + [.favorite, .unfavorite]
+        }
+        return baseCommands
+    }
+}

bitchat/Models/MessagePadding.swift

@@ -0,0 +1,61 @@
+//
+// MessagePadding.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+/// Provides privacy-preserving message padding to obscure actual content length.
+/// Uses PKCS#7-style padding with random bytes to prevent traffic analysis.
+struct MessagePadding {
+    // Standard block sizes for padding
+    static let blockSizes = [256, 512, 1024, 2048]
+    
+    // Add PKCS#7-style padding to reach target size
+    static func pad(_ data: Data, toSize targetSize: Int) -> Data {
+        guard data.count < targetSize else { return data }
+        
+        let paddingNeeded = targetSize - data.count
+        // Constrain to 255 to fit a single-byte pad length marker
+        guard paddingNeeded > 0 && paddingNeeded <= 255 else { return data }
+        
+        var padded = data
+        // PKCS#7: All pad bytes are equal to the pad length
+        padded.append(contentsOf: Array(repeating: UInt8(paddingNeeded), count: paddingNeeded))
+        return padded
+    }
+    
+    // Remove padding from data
+    static func unpad(_ data: Data) -> Data {
+        guard !data.isEmpty else { return data }
+        let last = data.last!
+        let paddingLength = Int(last)
+        // Must have at least 1 pad byte and not exceed data length
+        guard paddingLength > 0 && paddingLength <= data.count else { return data }
+        // Verify PKCS#7: all last N bytes equal to pad length
+        let start = data.count - paddingLength
+        let tail = data[start...]
+        for b in tail { if b != last { return data } }
+        return Data(data[..<start])
+    }
+    
+    // Find optimal block size for data
+    static func optimalBlockSize(for dataSize: Int) -> Int {
+        // Account for encryption overhead (~16 bytes for AES-GCM tag)
+        let totalSize = dataSize + 16
+        
+        // Find smallest block that fits
+        for blockSize in blockSizes {
+            if totalSize <= blockSize {
+                return blockSize
+            }
+        }
+        
+        // For very large messages, just use the original size
+        // (will be fragmented anyway)
+        return dataSize
+    }
+}

bitchat/Models/NoisePayload.swift

@@ -0,0 +1,41 @@
+//
+// NoisePayload.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+/// Helper to create typed Noise payloads
+struct NoisePayload {
+    let type: NoisePayloadType
+    let data: Data
+    
+    /// Encode payload with type prefix
+    func encode() -> Data {
+        var encoded = Data()
+        encoded.append(type.rawValue)
+        encoded.append(data)
+        return encoded
+    }
+    
+    /// Decode payload from data
+    static func decode(_ data: Data) -> NoisePayload? {
+        // Ensure we have at least 1 byte for the type
+        guard !data.isEmpty else {
+            return nil
+        }
+        
+        // Safely get the first byte
+        let firstByte = data[data.startIndex]
+        guard let type = NoisePayloadType(rawValue: firstByte) else {
+            return nil
+        }
+        
+        // Create a proper Data copy (not a subsequence) for thread safety
+        let payloadData = data.count > 1 ? Data(data.dropFirst()) : Data()
+        return NoisePayload(type: type, data: payloadData)
+    }
+}

bitchat/Models/PeerID.swift

@@ -0,0 +1,221 @@
+//
+// PeerID.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+struct PeerID: Equatable, Hashable {
+    enum Prefix: String, CaseIterable {
+        /// When no prefix is provided
+        case empty = ""
+        /// `"mesh:"`
+        case mesh = "mesh:"
+        /// `"name:"`
+        case name = "name:"
+        /// `"noise:"` (+ 64 characters hex)
+        case noise = "noise:"
+        /// `"nostr_"` (+ 16 characters hex)
+        case geoDM = "nostr_"
+        /// `"nostr:"` (+ 8 characters hex)
+        case geoChat = "nostr:"
+    }
+    
+    let prefix: Prefix
+    
+    /// Returns the actual value without any prefix
+    let bare: String
+    
+    /// Returns the full `id` value by combining `(prefix + bare)`
+    var id: String { prefix.rawValue + bare }
+    
+    // Private so the callers have to go through a convenience init
+    private init(prefix: Prefix, bare: any StringProtocol) {
+        self.prefix = prefix
+        self.bare = String(bare).lowercased()
+    }
+}
+
+// MARK: - Convenience Inits
+
+extension PeerID {
+    /// Convenience init to create GeoDM PeerID by appending `"nostr_"` to the first 16 characters of `pubKey`
+    init(nostr_ pubKey: String) {
+        self.init(prefix: .geoDM, bare: pubKey.prefix(TransportConfig.nostrConvKeyPrefixLength))
+    }
+    
+    /// Convenience init to create GeoChat PeerID by appending `"nostr:"` to the first 8 characters of `pubKey`
+    init(nostr pubKey: String) {
+        self.init(prefix: .geoChat, bare: pubKey.prefix(TransportConfig.nostrShortKeyDisplayLength))
+    }
+    
+    /// Convenience init to create PeerID from String/Substring by splitting it into prefix and bare parts
+    init(str: any StringProtocol) {
+        if let prefix = Prefix.allCases.first(where: { $0 != .empty && str.hasPrefix($0.rawValue) }) {
+            self.init(prefix: prefix, bare: String(str).dropFirst(prefix.rawValue.count))
+        } else {
+            self.init(prefix: .empty, bare: str)
+        }
+    }
+    
+    /// Convenience init to handle `Optional<String>`
+    init?(str: (any StringProtocol)?) {
+        guard let str else { return nil }
+        self.init(str: str)
+    }
+    
+    /// Convenience init to create PeerID by converting Data to String
+    init?(data: Data) {
+        self.init(str: String(data: data, encoding: .utf8))
+    }
+    
+    /// Convenience init to "hide" hex-encoding implementation detail
+    init(hexData: Data) {
+        self.init(str: hexData.hexEncodedString())
+    }
+    
+    /// Convenience init to "hide" hex-encoding implementation detail
+    init?(hexData: Data?) {
+        guard let hexData else { return nil }
+        self.init(hexData: hexData)
+    }
+}
+
+// MARK: - Noise Public Key Helpers
+
+extension PeerID {
+    /// Derive the stable 16-hex peer ID from a Noise static public key
+    init(publicKey: Data) {
+        self.init(str: publicKey.sha256Fingerprint().prefix(16))
+    }
+    
+    /// Returns a 16-hex short peer ID derived from a 64-hex Noise public key if needed
+    func toShort() -> PeerID {
+        if let noiseKey {
+            return PeerID(publicKey: noiseKey)
+        }
+        return self
+    }
+}
+
+// MARK: - Codable
+
+extension PeerID: Codable {
+    init(from decoder: any Decoder) throws {
+        self.init(str: try decoder.singleValueContainer().decode(String.self))
+    }
+    
+    func encode(to encoder: any Encoder) throws {
+        var container = encoder.singleValueContainer()
+        try container.encode(id)
+    }
+}
+
+// MARK: - Helpers
+
+extension PeerID {
+    var isEmpty: Bool {
+        id.isEmpty
+    }
+    
+    /// Returns true if `id` starts with "`nostr:`"
+    var isGeoChat: Bool {
+        prefix == .geoChat
+    }
+    
+    /// Returns true if `id` starts with "`nostr_`"
+    var isGeoDM: Bool {
+        prefix == .geoDM
+    }
+    
+    func toPercentEncoded() -> String {
+        id.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? id
+    }
+}
+
+extension PeerID {
+    var routingData: Data? {
+        if let direct = Data(hexString: id), direct.count == 8 { return direct }
+        if let bareData = Data(hexString: bare), bareData.count == 8 { return bareData }
+        let short = toShort()
+        return Data(hexString: short.id)
+    }
+
+    init?(routingData: Data) {
+        guard routingData.count == 8 else { return nil }
+        self.init(hexData: routingData)
+    }
+}
+
+// MARK: - Validation
+
+extension PeerID {
+    private enum Constants {
+        static let maxIDLength = 64
+        static let hexIDLength = 16 // 8 bytes = 16 hex chars
+    }
+    
+    /// Validates a peer ID from any source (short 16-hex, full 64-hex, or internal alnum/-/_ up to 64)
+    var isValid: Bool {
+        if prefix != .empty {
+            return PeerID(str: bare).isValid
+        }
+        
+        // Accept short routing IDs (exact 16-hex) or Full Noise key hex (exact 64-hex)
+        if isShort || isNoiseKeyHex {
+            return true
+        }
+        
+        // If length equals short or full but isn't valid hex, reject
+        if id.count == Constants.hexIDLength || id.count == Constants.maxIDLength {
+            return false
+        }
+        
+        // Internal format: alphanumeric + dash/underscore up to 63 (not 16 or 64)
+        let validCharset = CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-_"))
+        return !id.isEmpty &&
+                id.count < Constants.maxIDLength &&
+                id.rangeOfCharacter(from: validCharset.inverted) == nil
+    }
+    
+    /// Returns true if the `bare` id is all hex
+    var isHex: Bool {
+        bare.allSatisfy { $0.isHexDigit }
+    }
+    
+    /// Short routing IDs (exact 16-hex)
+    var isShort: Bool {
+        bare.count == Constants.hexIDLength && isHex
+    }
+    
+    /// Full Noise key hex (exact 64-hex)
+    var isNoiseKeyHex: Bool {
+        noiseKey != nil
+    }
+    
+    /// Full Noise key (exact 64-hex) as Data
+    var noiseKey: Data? {
+        guard bare.count == Constants.maxIDLength else { return nil }
+        return Data(hexString: bare)
+    }
+}
+
+// MARK: - Comparable
+
+extension PeerID: Comparable {
+    static func < (lhs: PeerID, rhs: PeerID) -> Bool {
+        lhs.id < rhs.id
+    }
+}
+
+// MARK: - CustomStringConvertible
+
+extension PeerID: CustomStringConvertible {
+    /// So it returns the actual `id` like before even inside another String
+    var description: String {
+        id
+    }
+}

bitchat/Models/PeerSession.swift

@@ -1,91 +0,0 @@
-import Foundation
-import CoreBluetooth
-
-/// Unified model for tracking all peer session data
-/// Consolidates multiple redundant data structures into a single source of truth
-class PeerSession {
-    // Core identification
-    let peerID: String
-    var nickname: String
-    
-    // Bluetooth connection
-    var peripheral: CBPeripheral?
-    var peripheralID: String?
-    var characteristic: CBCharacteristic?
-    
-    // Authentication and encryption
-    var isAuthenticated: Bool = false
-    var hasEstablishedNoiseSession: Bool = false
-    var fingerprint: String?
-    
-    // Connection state
-    var isConnected: Bool = false
-    var lastSeen: Date
-    
-    // Protocol state
-    var hasAnnounced: Bool = false
-    var hasReceivedAnnounce: Bool = false
-    var isActivePeer: Bool = false
-    
-    // Message tracking
-    var lastMessageSent: Date?
-    var lastMessageReceived: Date?
-    var pendingMessages: [String] = []
-    
-    // Connection timing
-    var lastConnectionTime: Date?
-    var lastSuccessfulMessageTime: Date?
-    var lastHeardFromPeer: Date?
-    
-    // Availability tracking
-    var isAvailable: Bool = false
-    
-    // Identity binding
-    var identityBinding: PeerIdentityBinding?
-    
-    init(peerID: String, nickname: String = "Unknown") {
-        self.peerID = peerID
-        self.nickname = nickname
-        self.lastSeen = Date()
-    }
-    
-    /// Update Bluetooth connection info
-    func updateBluetoothConnection(peripheral: CBPeripheral?, characteristic: CBCharacteristic?) {
-        self.peripheral = peripheral
-        self.peripheralID = peripheral?.identifier.uuidString
-        self.characteristic = characteristic
-        self.isConnected = (peripheral?.state == .connected)
-        if isConnected {
-            self.lastSeen = Date()
-        }
-    }
-    
-    /// Update authentication state
-    func updateAuthenticationState(authenticated: Bool, noiseSession: Bool) {
-        self.isAuthenticated = authenticated
-        self.hasEstablishedNoiseSession = noiseSession
-        if authenticated {
-            self.isActivePeer = true
-        }
-    }
-    
-    
-    /// Check if session is stale
-    var isStale: Bool {
-        // Consider stale if not seen for more than 5 minutes and not connected
-        return !isConnected && Date().timeIntervalSince(lastSeen) > 300
-    }
-    
-    /// Get display status for UI
-    var displayStatus: String {
-        if isConnected {
-            if isAuthenticated {
-                return "🟢" // Connected and authenticated
-            } else {
-                return "🟡" // Connected but not authenticated
-            }
-        } else {
-            return "🔴" // Not connected
-        }
-    }
-}

bitchat/Models/ReadReceipt.swift

@@ -0,0 +1,95 @@
+//
+// ReadReceipt.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+struct ReadReceipt: Codable {
+    let originalMessageID: String
+    let receiptID: String
+    var readerID: PeerID  // Who read it
+    let readerNickname: String
+    let timestamp: Date
+    
+    init(originalMessageID: String, readerID: PeerID, readerNickname: String) {
+        self.originalMessageID = originalMessageID
+        self.receiptID = UUID().uuidString
+        self.readerID = readerID
+        self.readerNickname = readerNickname
+        self.timestamp = Date()
+    }
+    
+    // For binary decoding
+    private init(originalMessageID: String, receiptID: String, readerID: PeerID, readerNickname: String, timestamp: Date) {
+        self.originalMessageID = originalMessageID
+        self.receiptID = receiptID
+        self.readerID = readerID
+        self.readerNickname = readerNickname
+        self.timestamp = timestamp
+    }
+    
+    func encode() -> Data? {
+        try? JSONEncoder().encode(self)
+    }
+    
+    static func decode(from data: Data) -> ReadReceipt? {
+        try? JSONDecoder().decode(ReadReceipt.self, from: data)
+    }
+    
+    // MARK: - Binary Encoding
+    
+    func toBinaryData() -> Data {
+        var data = Data()
+        data.appendUUID(originalMessageID)
+        data.appendUUID(receiptID)
+        // ReaderID as 8-byte hex string
+        var readerData = Data()
+        var tempID = readerID.id
+        while tempID.count >= 2 && readerData.count < 8 {
+            let hexByte = String(tempID.prefix(2))
+            if let byte = UInt8(hexByte, radix: 16) {
+                readerData.append(byte)
+            }
+            tempID = String(tempID.dropFirst(2))
+        }
+        while readerData.count < 8 {
+            readerData.append(0)
+        }
+        data.append(readerData)
+        data.appendDate(timestamp)
+        data.appendString(readerNickname)
+        return data
+    }
+    
+    static func fromBinaryData(_ data: Data) -> ReadReceipt? {
+        // Create defensive copy
+        let dataCopy = Data(data)
+        
+        // Minimum size: 2 UUIDs (32) + readerID (8) + timestamp (8) + min nickname
+        guard dataCopy.count >= 49 else { return nil }
+        
+        var offset = 0
+        
+        guard let originalMessageID = dataCopy.readUUID(at: &offset),
+              let receiptID = dataCopy.readUUID(at: &offset) else { return nil }
+        
+        guard let readerIDData = dataCopy.readFixedBytes(at: &offset, count: 8) else { return nil }
+        let readerID = PeerID(hexData: readerIDData)
+        guard readerID.isValid else { return nil }
+        
+        guard let timestamp = dataCopy.readDate(at: &offset),
+              InputValidator.validateTimestamp(timestamp),
+              let readerNicknameRaw = dataCopy.readString(at: &offset),
+              let readerNickname = InputValidator.validateNickname(readerNicknameRaw) else { return nil }
+        
+        return ReadReceipt(originalMessageID: originalMessageID,
+                          receiptID: receiptID,
+                          readerID: readerID,
+                          readerNickname: readerNickname,
+                          timestamp: timestamp)
+    }
+}

bitchat/Models/RequestSyncPacket.swift

@@ -0,0 +1,79 @@
+import Foundation
+
+// REQUEST_SYNC payload TLV (type, length16, value)
+//  - 0x01: P (uint8) — Golomb-Rice parameter
+//  - 0x02: M (uint32, big-endian) — hash range (N * 2^P)
+//  - 0x03: data (opaque) — GR bitstream bytes (MSB-first)
+struct RequestSyncPacket {
+    let p: Int
+    let m: UInt32
+    let data: Data
+    let types: SyncTypeFlags?
+
+    init(p: Int, m: UInt32, data: Data, types: SyncTypeFlags? = nil) {
+        self.p = p
+        self.m = m
+        self.data = data
+        self.types = types
+    }
+
+    func encode() -> Data {
+        var out = Data()
+        func putTLV(_ t: UInt8, _ v: Data) {
+            out.append(t)
+            let len = UInt16(v.count)
+            out.append(UInt8((len >> 8) & 0xFF))
+            out.append(UInt8(len & 0xFF))
+            out.append(v)
+        }
+        // P
+        putTLV(0x01, Data([UInt8(p & 0xFF)]))
+        // M (uint32)
+        var mBE = m.bigEndian
+        putTLV(0x02, withUnsafeBytes(of: &mBE) { Data($0) })
+        // data
+        putTLV(0x03, data)
+        if let typesData = types?.toData() {
+            putTLV(0x04, typesData)
+        }
+        return out
+    }
+
+    static func decode(from data: Data, maxAcceptBytes: Int = 1024) -> RequestSyncPacket? {
+        var off = 0
+        var p: Int? = nil
+        var m: UInt32? = nil
+        var payload: Data? = nil
+        var types: SyncTypeFlags? = nil
+
+        while off + 3 <= data.count {
+            let t = Int(data[off]); off += 1
+            guard off + 2 <= data.count else { return nil }
+            let len = (Int(data[off]) << 8) | Int(data[off+1]); off += 2
+            guard off + len <= data.count else { return nil }
+            let v = data.subdata(in: off..<(off+len)); off += len
+            switch t {
+            case 0x01:
+                if v.count == 1 { p = Int(v[0]) }
+            case 0x02:
+                if v.count == 4 {
+                    var mm: UInt32 = 0
+                    for b in v { mm = (mm << 8) | UInt32(b) }
+                    m = mm
+                }
+            case 0x03:
+                if v.count > maxAcceptBytes { return nil }
+                payload = v
+            case 0x04:
+                if let decoded = SyncTypeFlags.decode(v) {
+                    types = decoded
+                }
+            default:
+                break // forward compatible; ignore unknown TLVs
+            }
+        }
+
+        guard let pp = p, let mm = m, let dd = payload, pp >= 1, mm > 0 else { return nil }
+        return RequestSyncPacket(p: pp, m: mm, data: dd, types: types)
+    }
+}

bitchat/Noise/NoiseHandshakeCoordinator.swift

@@ -1,371 +0,0 @@
-//
-// NoiseHandshakeCoordinator.swift
-// bitchat
-//
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-
-/// Coordinates Noise handshakes to prevent race conditions and ensure reliable encryption establishment
-class NoiseHandshakeCoordinator {
-    
-    // MARK: - Handshake State
-    
-    enum HandshakeState: Equatable {
-        case idle
-        case waitingToInitiate(since: Date)
-        case initiating(attempt: Int, lastAttempt: Date)
-        case responding(since: Date)
-        case waitingForResponse(messagesSent: [Data], timeout: Date)
-        case established(since: Date)
-        case failed(reason: String, canRetry: Bool, lastAttempt: Date)
-        
-        var isActive: Bool {
-            switch self {
-            case .idle, .established, .failed:
-                return false
-            default:
-                return true
-            }
-        }
-    }
-    
-    // MARK: - Properties
-    
-    private var handshakeStates: [String: HandshakeState] = [:]
-    private var handshakeQueue = DispatchQueue(label: "chat.bitchat.noise.handshake", attributes: .concurrent)
-    
-    // Configuration
-    private let maxHandshakeAttempts = 3
-    private let handshakeTimeout: TimeInterval = 10.0
-    private let retryDelay: TimeInterval = 2.0
-    private let minTimeBetweenHandshakes: TimeInterval = 1.0 // Reduced from 5.0 for faster recovery
-    private let establishedSessionTTL: TimeInterval = 300.0 // 5 minutes - sessions older than this can be cleaned up
-    private let maxEstablishedSessions = 50 // Limit total established sessions
-    
-    // Track handshake messages to detect duplicates
-    private var processedHandshakeMessages: Set<Data> = []
-    private let messageHistoryLimit = 100
-    
-    // MARK: - Role Determination
-    
-    /// Deterministically determine who should initiate the handshake
-    /// Lower peer ID becomes the initiator to prevent simultaneous attempts
-    func determineHandshakeRole(myPeerID: String, remotePeerID: String) -> NoiseRole {
-        // Use simple string comparison for deterministic ordering
-        return myPeerID < remotePeerID ? .initiator : .responder
-    }
-    
-    /// Check if we should initiate handshake with a peer
-    func shouldInitiateHandshake(myPeerID: String, remotePeerID: String, forceIfStale: Bool = false) -> Bool {
-        return handshakeQueue.sync {
-            // Check if we're already in an active handshake
-            if let state = handshakeStates[remotePeerID], state.isActive {
-                // Check if the handshake is stale and we should force a new one
-                if forceIfStale {
-                    switch state {
-                    case .initiating(_, let lastAttempt):
-                        if Date().timeIntervalSince(lastAttempt) > handshakeTimeout {
-                            SecureLogger.log("Forcing new handshake with \(remotePeerID) - previous stuck in initiating", 
-                                           category: SecureLogger.handshake, level: .warning)
-                            return true
-                        }
-                    default:
-                        break
-                    }
-                }
-                
-                SecureLogger.log("Already in active handshake with \(remotePeerID), state: \(state)", 
-                               category: SecureLogger.handshake, level: .debug)
-                return false
-            }
-            
-            // Check role
-            let role = determineHandshakeRole(myPeerID: myPeerID, remotePeerID: remotePeerID)
-            if role != .initiator {
-                SecureLogger.log("Not initiator for handshake with \(remotePeerID) (my: \(myPeerID), their: \(remotePeerID))", 
-                               category: SecureLogger.handshake, level: .debug)
-                return false
-            }
-            
-            // Check if we've failed recently and can't retry yet
-            if case .failed(_, let canRetry, let lastAttempt) = handshakeStates[remotePeerID] {
-                if !canRetry {
-                    return false
-                }
-                if Date().timeIntervalSince(lastAttempt) < retryDelay {
-                    return false
-                }
-            }
-            
-            return true
-        }
-    }
-    
-    /// Record that we're initiating a handshake
-    func recordHandshakeInitiation(peerID: String) {
-        handshakeQueue.async(flags: .barrier) {
-            let attempt = self.getCurrentAttempt(for: peerID) + 1
-            self.handshakeStates[peerID] = .initiating(attempt: attempt, lastAttempt: Date())
-            SecureLogger.log("Recording handshake initiation with \(peerID), attempt \(attempt)", 
-                           category: SecureLogger.handshake, level: .info)
-        }
-    }
-    
-    /// Record that we're responding to a handshake
-    func recordHandshakeResponse(peerID: String) {
-        handshakeQueue.async(flags: .barrier) {
-            self.handshakeStates[peerID] = .responding(since: Date())
-            SecureLogger.log("Recording handshake response to \(peerID)", 
-                           category: SecureLogger.handshake, level: .info)
-        }
-    }
-    
-    /// Record successful handshake completion
-    func recordHandshakeSuccess(peerID: String) {
-        handshakeQueue.async(flags: .barrier) {
-            self.handshakeStates[peerID] = .established(since: Date())
-            SecureLogger.log("Handshake successfully established with \(peerID)", 
-                           category: SecureLogger.handshake, level: .info)
-        }
-    }
-    
-    /// Record handshake failure
-    func recordHandshakeFailure(peerID: String, reason: String) {
-        handshakeQueue.async(flags: .barrier) {
-            let attempts = self.getCurrentAttempt(for: peerID)
-            let canRetry = attempts < self.maxHandshakeAttempts
-            self.handshakeStates[peerID] = .failed(reason: reason, canRetry: canRetry, lastAttempt: Date())
-            SecureLogger.log("Handshake failed with \(peerID): \(reason), canRetry: \(canRetry)", 
-                           category: SecureLogger.handshake, level: .warning)
-        }
-    }
-    
-    /// Check if we should accept an incoming handshake initiation
-    func shouldAcceptHandshakeInitiation(myPeerID: String, remotePeerID: String) -> Bool {
-        return handshakeQueue.sync {
-            // If we're already established, reject new handshakes
-            if case .established = handshakeStates[remotePeerID] {
-                SecureLogger.log("Rejecting handshake from \(remotePeerID) - already established", 
-                               category: SecureLogger.handshake, level: .debug)
-                return false
-            }
-            
-            let role = determineHandshakeRole(myPeerID: myPeerID, remotePeerID: remotePeerID)
-            
-            // If we're the initiator and already initiating, this is a race condition
-            if role == .initiator {
-                if case .initiating = handshakeStates[remotePeerID] {
-                    // They shouldn't be initiating, but accept it to recover from race condition
-                    SecureLogger.log("Accepting handshake from \(remotePeerID) despite being initiator (race condition recovery)", 
-                                   category: SecureLogger.handshake, level: .warning)
-                    return true
-                }
-            }
-            
-            // If we're the responder, we should accept
-            return true
-        }
-    }
-    
-    /// Check if this is a duplicate handshake message
-    func isDuplicateHandshakeMessage(_ data: Data) -> Bool {
-        return handshakeQueue.sync {
-            if processedHandshakeMessages.contains(data) {
-                return true
-            }
-            
-            // Add to processed messages with size limit
-            if processedHandshakeMessages.count >= messageHistoryLimit {
-                processedHandshakeMessages.removeAll()
-            }
-            processedHandshakeMessages.insert(data)
-            return false
-        }
-    }
-    
-    /// Get time to wait before next handshake attempt
-    func getRetryDelay(for peerID: String) -> TimeInterval? {
-        return handshakeQueue.sync {
-            guard let state = handshakeStates[peerID] else { return nil }
-            
-            switch state {
-            case .failed(_, let canRetry, let lastAttempt):
-                if !canRetry { return nil }
-                let timeSinceFailure = Date().timeIntervalSince(lastAttempt)
-                if timeSinceFailure >= retryDelay {
-                    return 0
-                }
-                return retryDelay - timeSinceFailure
-                
-            case .initiating(_, let lastAttempt):
-                let timeSinceAttempt = Date().timeIntervalSince(lastAttempt)
-                if timeSinceAttempt >= minTimeBetweenHandshakes {
-                    return 0
-                }
-                return minTimeBetweenHandshakes - timeSinceAttempt
-                
-            default:
-                return nil
-            }
-        }
-    }
-    
-    /// Reset handshake state for a peer
-    func resetHandshakeState(for peerID: String) {
-        handshakeQueue.async(flags: .barrier) {
-            self.handshakeStates.removeValue(forKey: peerID)
-            SecureLogger.log("Reset handshake state for \(peerID)", 
-                           category: SecureLogger.handshake, level: .debug)
-        }
-    }
-    
-    /// Clean up stale handshake states and old established sessions
-    func cleanupStaleHandshakes(staleTimeout: TimeInterval = 30.0) -> [String] {
-        return handshakeQueue.sync {
-            let now = Date()
-            var stalePeerIDs: [String] = []
-            var establishedSessions: [(peerID: String, since: Date)] = []
-            
-            for (peerID, state) in handshakeStates {
-                var isStale = false
-                
-                switch state {
-                case .initiating(_, let lastAttempt):
-                    if now.timeIntervalSince(lastAttempt) > staleTimeout {
-                        isStale = true
-                    }
-                case .responding(let since):
-                    if now.timeIntervalSince(since) > staleTimeout {
-                        isStale = true
-                    }
-                case .waitingForResponse(_, let timeout):
-                    if now > timeout {
-                        isStale = true
-                    }
-                case .established(let since):
-                    // Track established sessions for potential cleanup
-                    establishedSessions.append((peerID, since))
-                    // Clean up very old established sessions
-                    if now.timeIntervalSince(since) > establishedSessionTTL {
-                        isStale = true
-                    }
-                default:
-                    break
-                }
-                
-                if isStale {
-                    stalePeerIDs.append(peerID)
-                    SecureLogger.log("Found stale handshake state for \(peerID): \(state)", 
-                                   category: SecureLogger.handshake, level: .warning)
-                }
-            }
-            
-            // If we have too many established sessions, clean up the oldest ones
-            if establishedSessions.count > maxEstablishedSessions {
-                // Sort by age (oldest first)
-                let sortedSessions = establishedSessions.sorted { $0.since < $1.since }
-                let sessionsToRemove = sortedSessions.count - maxEstablishedSessions
-                
-                for i in 0..<sessionsToRemove {
-                    let peerID = sortedSessions[i].peerID
-                    stalePeerIDs.append(peerID)
-                    SecureLogger.log("Removing old established session for \(peerID) to maintain session limit", 
-                                   category: SecureLogger.handshake, level: .info)
-                }
-            }
-            
-            // Clean up stale states
-            for peerID in stalePeerIDs {
-                handshakeStates.removeValue(forKey: peerID)
-            }
-            
-            if !stalePeerIDs.isEmpty {
-                SecureLogger.log("Cleaned up \(stalePeerIDs.count) stale handshake states", 
-                               category: SecureLogger.handshake, level: .info)
-            }
-            
-            return stalePeerIDs
-        }
-    }
-    
-    /// Get current handshake state
-    func getHandshakeState(for peerID: String) -> HandshakeState {
-        return handshakeQueue.sync {
-            return handshakeStates[peerID] ?? .idle
-        }
-    }
-    
-    /// Get current retry count for a peer
-    func getRetryCount(for peerID: String) -> Int {
-        return handshakeQueue.sync {
-            switch handshakeStates[peerID] {
-            case .initiating(let attempt, _):
-                return attempt - 1  // Attempts start at 1, retries start at 0
-            default:
-                return 0
-            }
-        }
-    }
-    
-    /// Increment retry count for a peer
-    func incrementRetryCount(for peerID: String) {
-        handshakeQueue.async(flags: .barrier) {
-            let currentAttempt = self.getCurrentAttempt(for: peerID)
-            self.handshakeStates[peerID] = .initiating(attempt: currentAttempt + 1, lastAttempt: Date())
-        }
-    }
-    
-    // MARK: - Private Helpers
-    
-    private func getCurrentAttempt(for peerID: String) -> Int {
-        switch handshakeStates[peerID] {
-        case .initiating(let attempt, _):
-            return attempt
-        case .failed(_, _, _):
-            // Count previous attempts
-            return 1 // Simplified for now
-        default:
-            return 0
-        }
-    }
-    
-    /// Log current handshake states for debugging
-    func logHandshakeStates() {
-        handshakeQueue.sync {
-            SecureLogger.log("=== Handshake States ===", category: SecureLogger.handshake, level: .debug)
-            for (peerID, state) in handshakeStates {
-                let stateDesc: String
-                switch state {
-                case .idle:
-                    stateDesc = "idle"
-                case .waitingToInitiate(let since):
-                    stateDesc = "waiting to initiate (since \(since))"
-                case .initiating(let attempt, let lastAttempt):
-                    stateDesc = "initiating (attempt \(attempt), last: \(lastAttempt))"
-                case .responding(let since):
-                    stateDesc = "responding (since: \(since))"
-                case .waitingForResponse(let messages, let timeout):
-                    stateDesc = "waiting for response (\(messages.count) messages, timeout: \(timeout))"
-                case .established(let since):
-                    stateDesc = "established (since \(since))"
-                case .failed(let reason, let canRetry, let lastAttempt):
-                    stateDesc = "failed: \(reason) (canRetry: \(canRetry), last: \(lastAttempt))"
-                }
-                SecureLogger.log("  \(peerID): \(stateDesc)", category: SecureLogger.handshake, level: .debug)
-            }
-            SecureLogger.log("========================", category: SecureLogger.handshake, level: .debug)
-        }
-    }
-    
-    /// Clear all handshake states - used during panic mode
-    func clearAllHandshakeStates() {
-        handshakeQueue.async(flags: .barrier) {
-            SecureLogger.log("Clearing all handshake states for panic mode", category: SecureLogger.handshake, level: .warning)
-            self.handshakeStates.removeAll()
-            self.processedHandshakeMessages.removeAll()
-        }
-    }
-}

bitchat/Noise/NoiseProtocol.swift

@@ -77,9 +77,9 @@
 /// - Noise Specification: http://www.noiseprotocol.org/noise.html
 ///
 
+import BitLogger
 import Foundation
 import CryptoKit
-import os.log
 
 // Core Noise Protocol implementation
 // Based on the Noise Protocol Framework specification
@@ -127,7 +127,7 @@ struct NoiseProtocolName {
 /// Handles ChaCha20-Poly1305 AEAD encryption with automatic nonce management
 /// and replay protection using a sliding window algorithm.
 /// - Warning: Nonce reuse would be catastrophic for security
-class NoiseCipherState {
+final class NoiseCipherState {
     // Constants for replay protection
     private static let NONCE_SIZE_BYTES = 4
     private static let REPLAY_WINDOW_SIZE = 1024
@@ -149,6 +149,10 @@ class NoiseCipherState {
         self.useExtractedNonce = useExtractedNonce
     }
     
+    deinit {
+        clearSensitiveData()
+    }
+    
     func initializeKey(_ key: SymmetricKey) {
         self.key = key
         self.nonce = 0
@@ -218,7 +222,7 @@ class NoiseCipherState {
         guard combinedPayload.count >= Self.NONCE_SIZE_BYTES else {
             return nil
         }
-
+        
         // Extract 4-byte nonce (big-endian)
         let nonceData = combinedPayload.prefix(Self.NONCE_SIZE_BYTES)
         let extractedNonce = nonceData.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) -> UInt64 in
@@ -229,18 +233,18 @@ class NoiseCipherState {
             }
             return result
         }
-
+        
         // Extract ciphertext (remaining bytes)
         let ciphertext = combinedPayload.dropFirst(Self.NONCE_SIZE_BYTES)
-
+        
         return (nonce: extractedNonce, ciphertext: Data(ciphertext))
     }
-
+    
     /// Convert nonce to 4-byte array (big-endian)
     private func nonceToBytes(_ nonce: UInt64) -> Data {
         var bytes = Data(count: Self.NONCE_SIZE_BYTES)
         withUnsafeBytes(of: nonce.bigEndian) { ptr in
-            // Copy only the last 4 bytes from the 8-byte UInt64 
+            // Copy only the last 4 bytes from the 8-byte UInt64
             let sourceBytes = ptr.bindMemory(to: UInt8.self)
             bytes.replaceSubrange(0..<Self.NONCE_SIZE_BYTES, with: sourceBytes.suffix(Self.NONCE_SIZE_BYTES))
         }
@@ -269,7 +273,7 @@ class NoiseCipherState {
         let sealedBox = try ChaChaPoly.seal(plaintext, using: key, nonce: ChaChaPoly.Nonce(data: nonceData), authenticating: associatedData)
         // increment local nonce
         nonce += 1
-               
+        
         // Create combined payload: <nonce><ciphertext>
         let combinedPayload: Data
         if (useExtractedNonce) {
@@ -281,9 +285,9 @@ class NoiseCipherState {
         
         // Log high nonce values that might indicate issues
         if currentNonce > Self.HIGH_NONCE_WARNING_THRESHOLD {
-            SecureLogger.log("High nonce value detected: \(currentNonce) - consider rekeying", category: SecureLogger.encryption, level: .warning)
+            SecureLogger.warning("High nonce value detected: \(currentNonce) - consider rekeying", category: .encryption)
         }
-                
+        
         return combinedPayload
     }
     
@@ -303,16 +307,16 @@ class NoiseCipherState {
         if useExtractedNonce {
             // Extract nonce and ciphertext from combined payload
             guard let (extractedNonce, actualCiphertext) = try extractNonceFromCiphertextPayload(ciphertext) else {
-                SecureLogger.log("Decrypt failed: Could not extract nonce from payload")
+                SecureLogger.debug("Decrypt failed: Could not extract nonce from payload")
                 throw NoiseError.invalidCiphertext
             }
             
             // Validate nonce with sliding window replay protection
             guard isValidNonce(extractedNonce) else {
-                SecureLogger.log("Replay attack detected: nonce \(extractedNonce) rejected")
+                SecureLogger.debug("Replay attack detected: nonce \(extractedNonce) rejected")
                 throw NoiseError.replayDetected
             }
-
+            
             // Split ciphertext and tag
             encryptedData = actualCiphertext.prefix(actualCiphertext.count - 16)
             tag = actualCiphertext.suffix(16)
@@ -338,7 +342,7 @@ class NoiseCipherState {
         
         // Log high nonce values that might indicate issues
         if decryptionNonce > Self.HIGH_NONCE_WARNING_THRESHOLD {
-            SecureLogger.log("High nonce value detected: \(decryptionNonce) - consider rekeying", category: SecureLogger.encryption, level: .warning)
+            SecureLogger.warning("High nonce value detected: \(decryptionNonce) - consider rekeying", category: .encryption)
         }
         
         do {
@@ -351,12 +355,27 @@ class NoiseCipherState {
             nonce += 1
             return plaintext
         } catch {
-            SecureLogger.log("Decrypt failed: \(error) for nonce \(decryptionNonce)")
+            SecureLogger.debug("Decrypt failed: \(error) for nonce \(decryptionNonce)")
             // Log authentication failures with nonce info
-            SecureLogger.log("Decryption failed at nonce \(decryptionNonce)", category: SecureLogger.encryption, level: .error)
+            SecureLogger.error("Decryption failed at nonce \(decryptionNonce)", category: .encryption)
             throw error
         }
     }
+    
+    /// Securely clear sensitive cryptographic data from memory
+    func clearSensitiveData() {
+        // Clear the symmetric key
+        key = nil
+        
+        // Reset nonce
+        nonce = 0
+        highestReceivedNonce = 0
+        
+        // Clear replay window
+        for i in 0..<replayWindow.count {
+            replayWindow[i] = 0
+        }
+    }
 }
 
 // MARK: - Symmetric State
@@ -365,7 +384,7 @@ class NoiseCipherState {
 /// Responsible for key derivation, protocol name hashing, and maintaining
 /// the chaining key that provides key separation between handshake messages.
 /// - Note: This class implements the SymmetricState object from the Noise spec
-class NoiseSymmetricState {
+final class NoiseSymmetricState {
     private var cipherState: NoiseCipherState
     private var chainingKey: Data
     private var hash: Data
@@ -378,7 +397,7 @@ class NoiseSymmetricState {
         if nameData.count <= 32 {
             self.hash = nameData + Data(repeating: 0, count: 32 - nameData.count)
         } else {
-            self.hash = Data(SHA256.hash(data: nameData))
+            self.hash = nameData.sha256Hash()
         }
         self.chainingKey = self.hash
     }
@@ -391,7 +410,7 @@ class NoiseSymmetricState {
     }
     
     func mixHash(_ data: Data) {
-        hash = Data(SHA256.hash(data: hash + data))
+        hash = (hash + data).sha256Hash()
     }
     
     func mixKeyAndHash(_ inputKeyMaterial: Data) {
@@ -432,13 +451,13 @@ class NoiseSymmetricState {
         }
     }
     
-    func split() -> (NoiseCipherState, NoiseCipherState) {
+    func split(useExtractedNonce: Bool) -> (NoiseCipherState, NoiseCipherState) {
         let output = hkdf(chainingKey: chainingKey, inputKeyMaterial: Data(), numOutputs: 2)
         let tempKey1 = SymmetricKey(data: output[0])
         let tempKey2 = SymmetricKey(data: output[1])
         
-        let c1 = NoiseCipherState(key: tempKey1, useExtractedNonce: true)
-        let c2 = NoiseCipherState(key: tempKey2, useExtractedNonce: true)
+        let c1 = NoiseCipherState(key: tempKey1, useExtractedNonce: useExtractedNonce)
+        let c2 = NoiseCipherState(key: tempKey2, useExtractedNonce: useExtractedNonce)
         
         return (c1, c2)
     }
@@ -469,9 +488,10 @@ class NoiseSymmetricState {
 /// This is the main interface for establishing encrypted sessions between peers.
 /// Manages the handshake state machine, message patterns, and key derivation.
 /// - Important: Each handshake instance should only be used once
-class NoiseHandshakeState {
+final class NoiseHandshakeState {
     private let role: NoiseRole
     private let pattern: NoisePattern
+    private let keychain: KeychainManagerProtocol
     private var symmetricState: NoiseSymmetricState
     
     // Keys
@@ -487,9 +507,24 @@ class NoiseHandshakeState {
     private var messagePatterns: [[NoiseMessagePattern]] = []
     private var currentPattern = 0
     
-    init(role: NoiseRole, pattern: NoisePattern, localStaticKey: Curve25519.KeyAgreement.PrivateKey? = nil, remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil) {
+    // Test support: predetermined ephemeral keys for test vectors
+    private var predeterminedEphemeralKey: Curve25519.KeyAgreement.PrivateKey?
+    private var prologueData: Data
+    
+    init(
+        role: NoiseRole,
+        pattern: NoisePattern,
+        keychain: KeychainManagerProtocol,
+        localStaticKey: Curve25519.KeyAgreement.PrivateKey? = nil,
+        remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil,
+        prologue: Data = Data(),
+        predeterminedEphemeralKey: Curve25519.KeyAgreement.PrivateKey? = nil
+    ) {
         self.role = role
         self.pattern = pattern
+        self.keychain = keychain
+        self.prologueData = prologue
+        self.predeterminedEphemeralKey = predeterminedEphemeralKey
         
         // Initialize static keys
         if let localKey = localStaticKey {
@@ -510,8 +545,8 @@ class NoiseHandshakeState {
     }
     
     private func mixPreMessageKeys() {
-        // Mix prologue (empty for XX pattern normally)
-        symmetricState.mixHash(Data()) // Empty prologue for XX pattern
+        // Mix prologue
+        symmetricState.mixHash(self.prologueData)
         // For XX pattern, no pre-message keys
         // For IK/NK patterns, we'd mix the responder's static key here
         switch pattern {
@@ -529,15 +564,20 @@ class NoiseHandshakeState {
         guard currentPattern < messagePatterns.count else {
             throw NoiseError.handshakeComplete
         }
-                
+        
         var messageBuffer = Data()
         let patterns = messagePatterns[currentPattern]
         
         for pattern in patterns {
             switch pattern {
             case .e:
-                // Generate ephemeral key
-                localEphemeralPrivate = Curve25519.KeyAgreement.PrivateKey()
+                // Generate ephemeral key (or use predetermined key for tests)
+                if let predetermined = predeterminedEphemeralKey {
+                    localEphemeralPrivate = predetermined
+                    predeterminedEphemeralKey = nil
+                } else {
+                    localEphemeralPrivate = Curve25519.KeyAgreement.PrivateKey()
+                }
                 localEphemeralPublic = localEphemeralPrivate!.publicKey
                 messageBuffer.append(localEphemeralPublic!.rawRepresentation)
                 symmetricState.mixHash(localEphemeralPublic!.rawRepresentation)
@@ -557,7 +597,10 @@ class NoiseHandshakeState {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localEphemeral.sharedSecretFromKeyAgreement(with: remoteEphemeral)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
                 
             case .es:
                 // DH(ephemeral, static) - direction depends on role
@@ -602,7 +645,10 @@ class NoiseHandshakeState {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localStatic.sharedSecretFromKeyAgreement(with: remoteStatic)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
             }
         }
         
@@ -619,7 +665,7 @@ class NoiseHandshakeState {
         guard currentPattern < messagePatterns.count else {
             throw NoiseError.handshakeComplete
         }
-                
+        
         var buffer = message
         let patterns = messagePatterns[currentPattern]
         
@@ -636,7 +682,7 @@ class NoiseHandshakeState {
                 do {
                     remoteEphemeralPublic = try NoiseHandshakeState.validatePublicKey(ephemeralData)
                 } catch {
-                    SecureLogger.log("Invalid ephemeral public key received", category: SecureLogger.security, level: .warning)
+                    SecureLogger.warning("Invalid ephemeral public key received", category: .security)
                     throw NoiseError.invalidMessage
                 }
                 symmetricState.mixHash(ephemeralData)
@@ -653,7 +699,7 @@ class NoiseHandshakeState {
                     let decrypted = try symmetricState.decryptAndHash(staticData)
                     remoteStaticPublic = try NoiseHandshakeState.validatePublicKey(decrypted)
                 } catch {
-                    SecureLogger.logSecurityEvent(.authenticationFailed(peerID: "Unknown - handshake"), level: .error)
+                    SecureLogger.error(.authenticationFailed(peerID: "Unknown - handshake"))
                     throw NoiseError.authenticationFailure
                 }
                 
@@ -687,14 +733,20 @@ class NoiseHandshakeState {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localEphemeral.sharedSecretFromKeyAgreement(with: remoteStatic)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
             } else {
                 guard let localStatic = localStaticPrivate,
                       let remoteEphemeral = remoteEphemeralPublic else {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localStatic.sharedSecretFromKeyAgreement(with: remoteEphemeral)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
             }
             
         case .se:
@@ -704,14 +756,20 @@ class NoiseHandshakeState {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localStatic.sharedSecretFromKeyAgreement(with: remoteEphemeral)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
             } else {
                 guard let localEphemeral = localEphemeralPrivate,
                       let remoteStatic = remoteStaticPublic else {
                     throw NoiseError.missingKeys
                 }
                 let shared = try localEphemeral.sharedSecretFromKeyAgreement(with: remoteStatic)
-                symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
+                var sharedData = shared.withUnsafeBytes { Data($0) }
+                symmetricState.mixKey(sharedData)
+                // Clear sensitive shared secret
+                keychain.secureClear(&sharedData)
             }
             
         case .ss:
@@ -722,7 +780,7 @@ class NoiseHandshakeState {
             let shared = try localStatic.sharedSecretFromKeyAgreement(with: remoteStatic)
             symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
             
-        default:
+        case .e, .s:
             break
         }
     }
@@ -731,12 +789,12 @@ class NoiseHandshakeState {
         return currentPattern >= messagePatterns.count
     }
     
-    func getTransportCiphers() throws -> (send: NoiseCipherState, receive: NoiseCipherState) {
+    func getTransportCiphers(useExtractedNonce: Bool) throws -> (send: NoiseCipherState, receive: NoiseCipherState) {
         guard isHandshakeComplete() else {
             throw NoiseError.handshakeNotComplete
         }
         
-        let (c1, c2) = symmetricState.split()
+        let (c1, c2) = symmetricState.split(useExtractedNonce: useExtractedNonce)
         
         // Initiator uses c1 for sending, c2 for receiving
         // Responder uses c2 for sending, c1 for receiving
@@ -840,7 +898,7 @@ extension NoiseHandshakeState {
         
         // Check against known bad points
         if lowOrderPoints.contains(keyData) {
-            SecureLogger.log("Low-order point detected", category: SecureLogger.security, level: .warning)
+            SecureLogger.warning("Low-order point detected", category: .security)
             throw NoiseError.invalidPublicKey
         }
         
@@ -850,7 +908,7 @@ extension NoiseHandshakeState {
             return publicKey
         } catch {
             // If CryptoKit rejects it, it's invalid
-            SecureLogger.log("CryptoKit validation failed", category: SecureLogger.security, level: .warning)
+            SecureLogger.warning("CryptoKit validation failed", category: .security)
             throw NoiseError.invalidPublicKey
         }
     }

bitchat/Noise/NoiseRateLimiter.swift

@@ -0,0 +1,95 @@
+//
+// NoiseRateLimiter.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import BitLogger
+import Foundation
+
+final class NoiseRateLimiter {
+    private var handshakeTimestamps: [PeerID: [Date]] = [:]
+    private var messageTimestamps: [PeerID: [Date]] = [:]
+    
+    // Global rate limiting
+    private var globalHandshakeTimestamps: [Date] = []
+    private var globalMessageTimestamps: [Date] = []
+    
+    private let queue = DispatchQueue(label: "chat.bitchat.noise.ratelimit", attributes: .concurrent)
+    
+    func allowHandshake(from peerID: PeerID) -> Bool {
+        return queue.sync(flags: .barrier) {
+            let now = Date()
+            let oneMinuteAgo = now.addingTimeInterval(-60)
+            
+            // Check global rate limit first
+            globalHandshakeTimestamps = globalHandshakeTimestamps.filter { $0 > oneMinuteAgo }
+            if globalHandshakeTimestamps.count >= NoiseSecurityConstants.maxGlobalHandshakesPerMinute {
+                SecureLogger.warning("Global handshake rate limit exceeded: \(globalHandshakeTimestamps.count)/\(NoiseSecurityConstants.maxGlobalHandshakesPerMinute) per minute", category: .security)
+                return false
+            }
+            
+            // Check per-peer rate limit
+            var timestamps = handshakeTimestamps[peerID] ?? []
+            timestamps = timestamps.filter { $0 > oneMinuteAgo }
+            
+            if timestamps.count >= NoiseSecurityConstants.maxHandshakesPerMinute {
+                SecureLogger.warning("Per-peer handshake rate limit exceeded for \(peerID): \(timestamps.count)/\(NoiseSecurityConstants.maxHandshakesPerMinute) per minute", category: .security)
+                return false
+            }
+            
+            // Record new handshake
+            timestamps.append(now)
+            handshakeTimestamps[peerID] = timestamps
+            globalHandshakeTimestamps.append(now)
+            return true
+        }
+    }
+    
+    func allowMessage(from peerID: PeerID) -> Bool {
+        return queue.sync(flags: .barrier) {
+            let now = Date()
+            let oneSecondAgo = now.addingTimeInterval(-1)
+            
+            // Check global rate limit first
+            globalMessageTimestamps = globalMessageTimestamps.filter { $0 > oneSecondAgo }
+            if globalMessageTimestamps.count >= NoiseSecurityConstants.maxGlobalMessagesPerSecond {
+                SecureLogger.warning("Global message rate limit exceeded: \(globalMessageTimestamps.count)/\(NoiseSecurityConstants.maxGlobalMessagesPerSecond) per second", category: .security)
+                return false
+            }
+            
+            // Check per-peer rate limit
+            var timestamps = messageTimestamps[peerID] ?? []
+            timestamps = timestamps.filter { $0 > oneSecondAgo }
+            
+            if timestamps.count >= NoiseSecurityConstants.maxMessagesPerSecond {
+                SecureLogger.warning("Per-peer message rate limit exceeded for \(peerID): \(timestamps.count)/\(NoiseSecurityConstants.maxMessagesPerSecond) per second", category: .security)
+                return false
+            }
+            
+            // Record new message
+            timestamps.append(now)
+            messageTimestamps[peerID] = timestamps
+            globalMessageTimestamps.append(now)
+            return true
+        }
+    }
+    
+    func reset(for peerID: PeerID) {
+        queue.async(flags: .barrier) {
+            self.handshakeTimestamps.removeValue(forKey: peerID)
+            self.messageTimestamps.removeValue(forKey: peerID)
+        }
+    }
+
+    func resetAll() {
+        queue.async(flags: .barrier) {
+            self.handshakeTimestamps.removeAll()
+            self.messageTimestamps.removeAll()
+            self.globalHandshakeTimestamps.removeAll()
+            self.globalMessageTimestamps.removeAll()
+        }
+    }
+}

bitchat/Noise/NoiseSecurityConsiderations.swift

@@ -1,227 +0,0 @@
-//
-// NoiseSecurityConsiderations.swift
-// bitchat
-//
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-import CryptoKit
-
-// MARK: - Security Constants
-
-enum NoiseSecurityConstants {
-    // Maximum message size to prevent memory exhaustion
-    static let maxMessageSize = 65535 // 64KB as per Noise spec
-    
-    // Maximum handshake message size
-    static let maxHandshakeMessageSize = 2048 // 2KB to accommodate XX pattern
-    
-    // Session timeout - sessions older than this should be renegotiated
-    static let sessionTimeout: TimeInterval = 86400 // 24 hours
-    
-    // Maximum number of messages before rekey (2^64 - 1 is the nonce limit)
-    static let maxMessagesPerSession: UInt64 = 1_000_000_000 // 1 billion messages
-    
-    // Handshake timeout - abandon incomplete handshakes
-    static let handshakeTimeout: TimeInterval = 60 // 1 minute
-    
-    // Maximum concurrent sessions per peer
-    static let maxSessionsPerPeer = 3
-    
-    // Rate limiting
-    static let maxHandshakesPerMinute = 10
-    static let maxMessagesPerSecond = 100
-    
-    // Global rate limiting (across all peers)
-    static let maxGlobalHandshakesPerMinute = 30
-    static let maxGlobalMessagesPerSecond = 500
-}
-
-// MARK: - Security Validations
-
-struct NoiseSecurityValidator {
-    
-    /// Validate message size
-    static func validateMessageSize(_ data: Data) -> Bool {
-        return data.count <= NoiseSecurityConstants.maxMessageSize
-    }
-    
-    /// Validate handshake message size
-    static func validateHandshakeMessageSize(_ data: Data) -> Bool {
-        return data.count <= NoiseSecurityConstants.maxHandshakeMessageSize
-    }
-    
-    /// Validate peer ID format
-    static func validatePeerID(_ peerID: String) -> Bool {
-        // Peer ID should be reasonable length and contain valid characters
-        let validCharset = CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-_"))
-        return peerID.count > 0 && 
-               peerID.count <= 64 && 
-               peerID.rangeOfCharacter(from: validCharset.inverted) == nil
-    }
-}
-
-// MARK: - Enhanced Noise Session with Security
-
-class SecureNoiseSession: NoiseSession {
-    private(set) var messageCount: UInt64 = 0
-    private let sessionStartTime = Date()
-    private(set) var lastActivityTime = Date()
-    
-    override func encrypt(_ plaintext: Data) throws -> Data {
-        // Check session age
-        if Date().timeIntervalSince(sessionStartTime) > NoiseSecurityConstants.sessionTimeout {
-            throw NoiseSecurityError.sessionExpired
-        }
-        
-        // Check message count
-        if messageCount >= NoiseSecurityConstants.maxMessagesPerSession {
-            throw NoiseSecurityError.sessionExhausted
-        }
-        
-        // Validate message size
-        guard NoiseSecurityValidator.validateMessageSize(plaintext) else {
-            throw NoiseSecurityError.messageTooLarge
-        }
-        
-        let encrypted = try super.encrypt(plaintext)
-        messageCount += 1
-        lastActivityTime = Date()
-        
-        return encrypted
-    }
-    
-    override func decrypt(_ ciphertext: Data) throws -> Data {
-        // Check session age
-        if Date().timeIntervalSince(sessionStartTime) > NoiseSecurityConstants.sessionTimeout {
-            throw NoiseSecurityError.sessionExpired
-        }
-        
-        // Validate message size
-        guard NoiseSecurityValidator.validateMessageSize(ciphertext) else {
-            throw NoiseSecurityError.messageTooLarge
-        }
-        
-        let decrypted = try super.decrypt(ciphertext)
-        lastActivityTime = Date()
-        
-        return decrypted
-    }
-    
-    func needsRenegotiation() -> Bool {
-        // Check if we've used more than 90% of message limit
-        let messageThreshold = UInt64(Double(NoiseSecurityConstants.maxMessagesPerSession) * 0.9)
-        if messageCount >= messageThreshold {
-            return true
-        }
-        
-        // Check if last activity was more than 30 minutes ago
-        if Date().timeIntervalSince(lastActivityTime) > NoiseSecurityConstants.sessionTimeout {
-            return true
-        }
-        
-        return false
-    }
-    
-    // MARK: - Testing Support
-    #if DEBUG
-    func setLastActivityTimeForTesting(_ date: Date) {
-        lastActivityTime = date
-    }
-    
-    func setMessageCountForTesting(_ count: UInt64) {
-        messageCount = count
-    }
-    #endif
-}
-
-// MARK: - Rate Limiter
-
-class NoiseRateLimiter {
-    private var handshakeTimestamps: [String: [Date]] = [:] // peerID -> timestamps
-    private var messageTimestamps: [String: [Date]] = [:] // peerID -> timestamps
-    
-    // Global rate limiting
-    private var globalHandshakeTimestamps: [Date] = []
-    private var globalMessageTimestamps: [Date] = []
-    
-    private let queue = DispatchQueue(label: "chat.bitchat.noise.ratelimit", attributes: .concurrent)
-    
-    func allowHandshake(from peerID: String) -> Bool {
-        return queue.sync(flags: .barrier) {
-            let now = Date()
-            let oneMinuteAgo = now.addingTimeInterval(-60)
-            
-            // Check global rate limit first
-            globalHandshakeTimestamps = globalHandshakeTimestamps.filter { $0 > oneMinuteAgo }
-            if globalHandshakeTimestamps.count >= NoiseSecurityConstants.maxGlobalHandshakesPerMinute {
-                SecureLogger.log("Global handshake rate limit exceeded: \(globalHandshakeTimestamps.count)/\(NoiseSecurityConstants.maxGlobalHandshakesPerMinute) per minute", category: SecureLogger.security, level: .warning)
-                return false
-            }
-            
-            // Check per-peer rate limit
-            var timestamps = handshakeTimestamps[peerID] ?? []
-            timestamps = timestamps.filter { $0 > oneMinuteAgo }
-            
-            if timestamps.count >= NoiseSecurityConstants.maxHandshakesPerMinute {
-                SecureLogger.log("Per-peer handshake rate limit exceeded for \(peerID): \(timestamps.count)/\(NoiseSecurityConstants.maxHandshakesPerMinute) per minute", category: SecureLogger.security, level: .warning)
-                return false
-            }
-            
-            // Record new handshake
-            timestamps.append(now)
-            handshakeTimestamps[peerID] = timestamps
-            globalHandshakeTimestamps.append(now)
-            return true
-        }
-    }
-    
-    func allowMessage(from peerID: String) -> Bool {
-        return queue.sync(flags: .barrier) {
-            let now = Date()
-            let oneSecondAgo = now.addingTimeInterval(-1)
-            
-            // Check global rate limit first
-            globalMessageTimestamps = globalMessageTimestamps.filter { $0 > oneSecondAgo }
-            if globalMessageTimestamps.count >= NoiseSecurityConstants.maxGlobalMessagesPerSecond {
-                SecureLogger.log("Global message rate limit exceeded: \(globalMessageTimestamps.count)/\(NoiseSecurityConstants.maxGlobalMessagesPerSecond) per second", category: SecureLogger.security, level: .warning)
-                return false
-            }
-            
-            // Check per-peer rate limit
-            var timestamps = messageTimestamps[peerID] ?? []
-            timestamps = timestamps.filter { $0 > oneSecondAgo }
-            
-            if timestamps.count >= NoiseSecurityConstants.maxMessagesPerSecond {
-                SecureLogger.log("Per-peer message rate limit exceeded for \(peerID): \(timestamps.count)/\(NoiseSecurityConstants.maxMessagesPerSecond) per second", category: SecureLogger.security, level: .warning)
-                return false
-            }
-            
-            // Record new message
-            timestamps.append(now)
-            messageTimestamps[peerID] = timestamps
-            globalMessageTimestamps.append(now)
-            return true
-        }
-    }
-    
-    func reset(for peerID: String) {
-        queue.async(flags: .barrier) {
-            self.handshakeTimestamps.removeValue(forKey: peerID)
-            self.messageTimestamps.removeValue(forKey: peerID)
-        }
-    }
-}
-
-// MARK: - Security Errors
-
-enum NoiseSecurityError: Error {
-    case sessionExpired
-    case sessionExhausted
-    case messageTooLarge
-    case invalidPeerID
-    case rateLimitExceeded
-    case handshakeTimeout
-}

bitchat/Noise/NoiseSecurityConstants.swift

@@ -0,0 +1,37 @@
+//
+// NoiseSecurityConstants.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+enum NoiseSecurityConstants {
+    // Maximum message size to prevent memory exhaustion
+    static let maxMessageSize = 65535 // 64KB as per Noise spec
+    
+    // Maximum handshake message size
+    static let maxHandshakeMessageSize = 2048 // 2KB to accommodate XX pattern
+    
+    // Session timeout - sessions older than this should be renegotiated
+    static let sessionTimeout: TimeInterval = 86400 // 24 hours
+    
+    // Maximum number of messages before rekey (2^64 - 1 is the nonce limit)
+    static let maxMessagesPerSession: UInt64 = 1_000_000_000 // 1 billion messages
+    
+    // Handshake timeout - abandon incomplete handshakes
+    static let handshakeTimeout: TimeInterval = 60 // 1 minute
+    
+    // Maximum concurrent sessions per peer
+    static let maxSessionsPerPeer = 3
+    
+    // Rate limiting
+    static let maxHandshakesPerMinute = 10
+    static let maxMessagesPerSecond = 100
+    
+    // Global rate limiting (across all peers)
+    static let maxGlobalHandshakesPerMinute = 30
+    static let maxGlobalMessagesPerSecond = 500
+}

bitchat/Noise/NoiseSecurityError.swift

@@ -0,0 +1,18 @@
+//
+// NoiseSecurityError.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+enum NoiseSecurityError: Error {
+    case sessionExpired
+    case sessionExhausted
+    case messageTooLarge
+    case invalidPeerID
+    case rateLimitExceeded
+    case handshakeTimeout
+}

bitchat/Noise/NoiseSecurityValidator.swift

@@ -0,0 +1,22 @@
+//
+// NoiseSecurityValidator.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+struct NoiseSecurityValidator {
+    
+    /// Validate message size
+    static func validateMessageSize(_ data: Data) -> Bool {
+        return data.count <= NoiseSecurityConstants.maxMessageSize
+    }
+    
+    /// Validate handshake message size
+    static func validateHandshakeMessageSize(_ data: Data) -> Bool {
+        return data.count <= NoiseSecurityConstants.maxHandshakeMessageSize
+    }
+}

bitchat/Noise/NoiseSession.swift

@@ -6,37 +6,14 @@
 // For more information, see <https://unlicense.org>
 //
 
+import BitLogger
 import Foundation
 import CryptoKit
-import os.log
-
-// MARK: - Noise Session State
-
-enum NoiseSessionState: Equatable {
-    case uninitialized
-    case handshaking
-    case established
-    case failed(Error)
-    
-    static func == (lhs: NoiseSessionState, rhs: NoiseSessionState) -> Bool {
-        switch (lhs, rhs) {
-        case (.uninitialized, .uninitialized),
-             (.handshaking, .handshaking),
-             (.established, .established):
-            return true
-        case (.failed, .failed):
-            return true // We don't compare the errors
-        default:
-            return false
-        }
-    }
-}
-
-// MARK: - Noise Session
 
 class NoiseSession {
-    let peerID: String
+    let peerID: PeerID
     let role: NoiseRole
+    private let keychain: KeychainManagerProtocol
     private var state: NoiseSessionState = .uninitialized
     private var handshakeState: NoiseHandshakeState?
     private var sendCipher: NoiseCipherState?
@@ -53,9 +30,16 @@ class NoiseSession {
     // Thread safety
     private let sessionQueue = DispatchQueue(label: "chat.bitchat.noise.session", attributes: .concurrent)
     
-    init(peerID: String, role: NoiseRole, localStaticKey: Curve25519.KeyAgreement.PrivateKey, remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil) {
+    init(
+        peerID: PeerID,
+        role: NoiseRole,
+        keychain: KeychainManagerProtocol,
+        localStaticKey: Curve25519.KeyAgreement.PrivateKey,
+        remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil
+    ) {
         self.peerID = peerID
         self.role = role
+        self.keychain = keychain
         self.localStaticKey = localStaticKey
         self.remoteStaticPublicKey = remoteStaticKey
     }
@@ -72,6 +56,7 @@ class NoiseSession {
             handshakeState = NoiseHandshakeState(
                 role: role,
                 pattern: .XX,
+                keychain: keychain,
                 localStaticKey: localStaticKey,
                 remoteStaticKey: nil
             )
@@ -92,18 +77,19 @@ class NoiseSession {
     
     func processHandshakeMessage(_ message: Data) throws -> Data? {
         return try sessionQueue.sync(flags: .barrier) {
-            SecureLogger.log("NoiseSession[\(peerID)]: Processing handshake message, current state: \(state), role: \(role)", category: SecureLogger.noise, level: .info)
+            SecureLogger.debug("NoiseSession[\(peerID)]: Processing handshake message, current state: \(state), role: \(role)")
             
             // Initialize handshake state if needed (for responders)
             if state == .uninitialized && role == .responder {
                 handshakeState = NoiseHandshakeState(
                     role: role,
                     pattern: .XX,
+                    keychain: keychain,
                     localStaticKey: localStaticKey,
                     remoteStaticKey: nil
                 )
                 state = .handshaking
-                SecureLogger.log("NoiseSession[\(peerID)]: Initialized handshake state for responder", category: SecureLogger.noise, level: .info)
+                SecureLogger.debug("NoiseSession[\(peerID)]: Initialized handshake state for responder")
             }
             
             guard case .handshaking = state, let handshake = handshakeState else {
@@ -112,12 +98,12 @@ class NoiseSession {
             
             // Process incoming message
             _ = try handshake.readMessage(message)
-            SecureLogger.log("NoiseSession[\(peerID)]: Read handshake message, checking if complete", category: SecureLogger.noise, level: .info)
+            SecureLogger.debug("NoiseSession[\(peerID)]: Read handshake message, checking if complete")
             
             // Check if handshake is complete
             if handshake.isHandshakeComplete() {
                 // Get transport ciphers
-                let (send, receive) = try handshake.getTransportCiphers()
+                let (send, receive) = try handshake.getTransportCiphers(useExtractedNonce: true)
                 sendCipher = send
                 receiveCipher = receive
                 
@@ -130,20 +116,20 @@ class NoiseSession {
                 state = .established
                 handshakeState = nil // Clear handshake state
                 
-                SecureLogger.log("NoiseSession[\(peerID)]: Handshake complete (no response needed), transitioning to established", category: SecureLogger.noise, level: .info)
-                SecureLogger.logSecurityEvent(.handshakeCompleted(peerID: peerID))
+                SecureLogger.debug("NoiseSession[\(peerID)]: Handshake complete (no response needed), transitioning to established")
+                SecureLogger.info(.handshakeCompleted(peerID: peerID.id))
                 
                 return nil
             } else {
                 // Generate response
                 let response = try handshake.writeMessage()
                 sentHandshakeMessages.append(response)
-                SecureLogger.log("NoiseSession[\(peerID)]: Generated handshake response of size \(response.count)", category: SecureLogger.noise, level: .info)
+                SecureLogger.debug("NoiseSession[\(peerID)]: Generated handshake response of size \(response.count)")
                 
                 // Check if handshake is complete after writing
                 if handshake.isHandshakeComplete() {
                     // Get transport ciphers
-                    let (send, receive) = try handshake.getTransportCiphers()
+                    let (send, receive) = try handshake.getTransportCiphers(useExtractedNonce: true)
                     sendCipher = send
                     receiveCipher = receive
                     
@@ -156,8 +142,8 @@ class NoiseSession {
                     state = .established
                     handshakeState = nil // Clear handshake state
                     
-                    SecureLogger.log("NoiseSession[\(peerID)]: Handshake complete after writing response, transitioning to established", category: SecureLogger.noise, level: .info)
-                    SecureLogger.logSecurityEvent(.handshakeCompleted(peerID: peerID))
+                    SecureLogger.debug("NoiseSession[\(peerID)]: Handshake complete after writing response, transitioning to established")
+                    SecureLogger.info(.handshakeCompleted(peerID: peerID.id))
                 }
                 
                 return response
@@ -210,262 +196,34 @@ class NoiseSession {
         }
     }
     
-    func getHandshakeHash() -> Data? {
-        return sessionQueue.sync {
-            return handshakeHash
-        }
-    }
-    
     func reset() {
         sessionQueue.sync(flags: .barrier) {
             let wasEstablished = state == .established
             state = .uninitialized
             handshakeState = nil
+            
+            // Clear sensitive cipher states
+            sendCipher?.clearSensitiveData()
+            receiveCipher?.clearSensitiveData()
             sendCipher = nil
             receiveCipher = nil
+            
+            // Clear sent handshake messages
+            for i in 0..<sentHandshakeMessages.count {
+                var message = sentHandshakeMessages[i]
+                keychain.secureClear(&message)
+            }
             sentHandshakeMessages.removeAll()
+            
+            // Clear handshake hash
+            if var hash = handshakeHash {
+                keychain.secureClear(&hash)
+            }
             handshakeHash = nil
             
             if wasEstablished {
-                SecureLogger.logSecurityEvent(.sessionExpired(peerID: peerID))
+                SecureLogger.info(.sessionExpired(peerID: peerID.id))
             }
         }
     }
 }
-
-// MARK: - Session Manager
-
-class NoiseSessionManager {
-    private var sessions: [String: NoiseSession] = [:]
-    private let localStaticKey: Curve25519.KeyAgreement.PrivateKey
-    private let managerQueue = DispatchQueue(label: "chat.bitchat.noise.manager", attributes: .concurrent)
-    
-    // Callbacks
-    var onSessionEstablished: ((String, Curve25519.KeyAgreement.PublicKey) -> Void)?
-    var onSessionFailed: ((String, Error) -> Void)?
-    
-    init(localStaticKey: Curve25519.KeyAgreement.PrivateKey) {
-        self.localStaticKey = localStaticKey
-    }
-    
-    // MARK: - Session Management
-    
-    func createSession(for peerID: String, role: NoiseRole) -> NoiseSession {
-        return managerQueue.sync(flags: .barrier) {
-            let session = SecureNoiseSession(
-                peerID: peerID,
-                role: role,
-                localStaticKey: localStaticKey
-            )
-            sessions[peerID] = session
-            return session
-        }
-    }
-    
-    func getSession(for peerID: String) -> NoiseSession? {
-        return managerQueue.sync {
-            return sessions[peerID]
-        }
-    }
-    
-    func removeSession(for peerID: String) {
-        managerQueue.sync(flags: .barrier) {
-            if let session = sessions[peerID], session.isEstablished() {
-                SecureLogger.logSecurityEvent(.sessionExpired(peerID: peerID))
-            }
-            _ = sessions.removeValue(forKey: peerID)
-        }
-    }
-    
-    func migrateSession(from oldPeerID: String, to newPeerID: String) {
-        managerQueue.sync(flags: .barrier) {
-            // Check if we have a session for the old peer ID
-            if let session = sessions[oldPeerID] {
-                // Move the session to the new peer ID
-                sessions[newPeerID] = session
-                _ = sessions.removeValue(forKey: oldPeerID)
-                
-                SecureLogger.log("Migrated Noise session from \(oldPeerID) to \(newPeerID)", category: SecureLogger.noise, level: .info)
-            }
-        }
-    }
-    
-    func getEstablishedSessions() -> [String: NoiseSession] {
-        return managerQueue.sync {
-            return sessions.filter { $0.value.isEstablished() }
-        }
-    }
-    
-    // MARK: - Handshake Helpers
-    
-    func initiateHandshake(with peerID: String) throws -> Data {
-        return try managerQueue.sync(flags: .barrier) {
-            // Check if we already have an established session
-            if let existingSession = sessions[peerID], existingSession.isEstablished() {
-                // Session already established, don't recreate
-                throw NoiseSessionError.alreadyEstablished
-            }
-            
-            // Remove any existing non-established session
-            if let existingSession = sessions[peerID], !existingSession.isEstablished() {
-                _ = sessions.removeValue(forKey: peerID)
-            }
-            
-            // Create new initiator session
-            let session = SecureNoiseSession(
-                peerID: peerID,
-                role: .initiator,
-                localStaticKey: localStaticKey
-            )
-            sessions[peerID] = session
-            
-            do {
-                let handshakeData = try session.startHandshake()
-                return handshakeData
-            } catch {
-                // Clean up failed session
-                _ = sessions.removeValue(forKey: peerID)
-                SecureLogger.logSecurityEvent(.handshakeFailed(peerID: peerID, error: error.localizedDescription), level: .error)
-                throw error
-            }
-        }
-    }
-    
-    func handleIncomingHandshake(from peerID: String, message: Data) throws -> Data? {
-        // Process everything within the synchronized block to prevent race conditions
-        return try managerQueue.sync(flags: .barrier) {
-            var shouldCreateNew = false
-            var existingSession: NoiseSession? = nil
-            
-            if let existing = sessions[peerID] {
-                // If we have an established session, the peer must have cleared their session
-                // for a good reason (e.g., decryption failure, restart, etc.)
-                // We should accept the new handshake to re-establish encryption
-                if existing.isEstablished() {
-                    SecureLogger.log("Accepting handshake from \(peerID) despite existing session - peer likely cleared their session", 
-                                   category: SecureLogger.session, level: .info)
-                    _ = sessions.removeValue(forKey: peerID)
-                    shouldCreateNew = true
-                } else {
-                    // If we're in the middle of a handshake and receive a new initiation,
-                    // reset and start fresh (the other side may have restarted)
-                    if existing.getState() == .handshaking && message.count == 32 {
-                        _ = sessions.removeValue(forKey: peerID)
-                        shouldCreateNew = true
-                    } else {
-                        existingSession = existing
-                    }
-                }
-            } else {
-                shouldCreateNew = true
-            }
-            
-            // Get or create session
-            let session: NoiseSession
-            if shouldCreateNew {
-                let newSession = SecureNoiseSession(
-                    peerID: peerID,
-                    role: .responder,
-                    localStaticKey: localStaticKey
-                )
-                sessions[peerID] = newSession
-                session = newSession
-            } else {
-                session = existingSession!
-            }
-            
-            // Process the handshake message within the synchronized block
-            do {
-                let response = try session.processHandshakeMessage(message)
-                
-                // Check if session is established after processing
-                if session.isEstablished() {
-                    if let remoteKey = session.getRemoteStaticPublicKey() {
-                        // Schedule callback outside the synchronized block to prevent deadlock
-                        DispatchQueue.global().async { [weak self] in
-                            self?.onSessionEstablished?(peerID, remoteKey)
-                        }
-                    }
-                }
-                
-                return response
-            } catch {
-                // Reset the session on handshake failure so next attempt can start fresh
-                _ = sessions.removeValue(forKey: peerID)
-                
-                // Schedule callback outside the synchronized block to prevent deadlock
-                DispatchQueue.global().async { [weak self] in
-                    self?.onSessionFailed?(peerID, error)
-                }
-                
-                SecureLogger.logSecurityEvent(.handshakeFailed(peerID: peerID, error: error.localizedDescription), level: .error)
-                throw error
-            }
-        }
-    }
-    
-    // MARK: - Encryption/Decryption
-    
-    func encrypt(_ plaintext: Data, for peerID: String) throws -> Data {
-        guard let session = getSession(for: peerID) else {
-            throw NoiseSessionError.sessionNotFound
-        }
-        
-        return try session.encrypt(plaintext)
-    }
-    
-    func decrypt(_ ciphertext: Data, from peerID: String) throws -> Data {
-        guard let session = getSession(for: peerID) else {
-            throw NoiseSessionError.sessionNotFound
-        }
-        
-        return try session.decrypt(ciphertext)
-    }
-    
-    // MARK: - Key Management
-    
-    func getRemoteStaticKey(for peerID: String) -> Curve25519.KeyAgreement.PublicKey? {
-        return getSession(for: peerID)?.getRemoteStaticPublicKey()
-    }
-    
-    func getHandshakeHash(for peerID: String) -> Data? {
-        return getSession(for: peerID)?.getHandshakeHash()
-    }
-    
-    // MARK: - Session Rekeying
-    
-    func getSessionsNeedingRekey() -> [(peerID: String, needsRekey: Bool)] {
-        return managerQueue.sync {
-            var needingRekey: [(peerID: String, needsRekey: Bool)] = []
-            
-            for (peerID, session) in sessions {
-                if let secureSession = session as? SecureNoiseSession,
-                   secureSession.isEstablished(),
-                   secureSession.needsRenegotiation() {
-                    needingRekey.append((peerID: peerID, needsRekey: true))
-                }
-            }
-            
-            return needingRekey
-        }
-    }
-    
-    func initiateRekey(for peerID: String) throws {
-        // Remove old session
-        removeSession(for: peerID)
-        
-        // Initiate new handshake
-        _ = try initiateHandshake(with: peerID)
-        
-    }
-}
-
-// MARK: - Errors
-
-enum NoiseSessionError: Error {
-    case invalidState
-    case notEstablished
-    case sessionNotFound
-    case handshakeFailed(Error)
-    case alreadyEstablished
-}

bitchat/Noise/NoiseSessionError.swift

@@ -0,0 +1,14 @@
+//
+// NoiseSessionError.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+enum NoiseSessionError: Error, Equatable {
+    case invalidState
+    case notEstablished
+    case sessionNotFound
+    case alreadyEstablished
+}

bitchat/Noise/NoiseSessionManager.swift

@@ -0,0 +1,211 @@
+//
+// NoiseSessionManager.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import BitLogger
+import CryptoKit
+import Foundation
+
+final class NoiseSessionManager {
+    private var sessions: [PeerID: NoiseSession] = [:]
+    private let localStaticKey: Curve25519.KeyAgreement.PrivateKey
+    private let keychain: KeychainManagerProtocol
+    private let managerQueue = DispatchQueue(label: "chat.bitchat.noise.manager", attributes: .concurrent)
+    
+    // Callbacks
+    var onSessionEstablished: ((PeerID, Curve25519.KeyAgreement.PublicKey) -> Void)?
+    var onSessionFailed: ((PeerID, Error) -> Void)?
+    
+    init(localStaticKey: Curve25519.KeyAgreement.PrivateKey, keychain: KeychainManagerProtocol) {
+        self.localStaticKey = localStaticKey
+        self.keychain = keychain
+    }
+    
+    // MARK: - Session Management
+    
+    func getSession(for peerID: PeerID) -> NoiseSession? {
+        return managerQueue.sync {
+            return sessions[peerID]
+        }
+    }
+    
+    func removeSession(for peerID: PeerID) {
+        managerQueue.sync(flags: .barrier) {
+            if let session = sessions.removeValue(forKey: peerID) {
+                session.reset() // Clear sensitive data before removing
+            }
+        }
+    }
+
+    func removeAllSessions() {
+        managerQueue.sync(flags: .barrier) {
+            for (_, session) in sessions {
+                session.reset()
+            }
+            sessions.removeAll()
+        }
+    }
+    
+    // MARK: - Handshake Helpers
+    
+    func initiateHandshake(with peerID: PeerID) throws -> Data {
+        return try managerQueue.sync(flags: .barrier) {
+            // Check if we already have an established session
+            if let existingSession = sessions[peerID], existingSession.isEstablished() {
+                // Session already established, don't recreate
+                throw NoiseSessionError.alreadyEstablished
+            }
+            
+            // Remove any existing non-established session
+            if let existingSession = sessions[peerID], !existingSession.isEstablished() {
+                _ = sessions.removeValue(forKey: peerID)
+            }
+            
+            // Create new initiator session
+            let session = SecureNoiseSession(
+                peerID: peerID,
+                role: .initiator,
+                keychain: keychain,
+                localStaticKey: localStaticKey
+            )
+            sessions[peerID] = session
+            
+            do {
+                let handshakeData = try session.startHandshake()
+                return handshakeData
+            } catch {
+                // Clean up failed session
+                _ = sessions.removeValue(forKey: peerID)
+                SecureLogger.error(.handshakeFailed(peerID: peerID.id, error: error.localizedDescription))
+                throw error
+            }
+        }
+    }
+    
+    func handleIncomingHandshake(from peerID: PeerID, message: Data) throws -> Data? {
+        // Process everything within the synchronized block to prevent race conditions
+        return try managerQueue.sync(flags: .barrier) {
+            var shouldCreateNew = false
+            var existingSession: NoiseSession? = nil
+            
+            if let existing = sessions[peerID] {
+                // If we have an established session, the peer must have cleared their session
+                // for a good reason (e.g., decryption failure, restart, etc.)
+                // We should accept the new handshake to re-establish encryption
+                if existing.isEstablished() {
+                    SecureLogger.info("Accepting handshake from \(peerID) despite existing session - peer likely cleared their session", category: .session)
+                    _ = sessions.removeValue(forKey: peerID)
+                    shouldCreateNew = true
+                } else {
+                    // If we're in the middle of a handshake and receive a new initiation,
+                    // reset and start fresh (the other side may have restarted)
+                    if existing.getState() == .handshaking && message.count == 32 {
+                        _ = sessions.removeValue(forKey: peerID)
+                        shouldCreateNew = true
+                    } else {
+                        existingSession = existing
+                    }
+                }
+            } else {
+                shouldCreateNew = true
+            }
+            
+            // Get or create session
+            let session: NoiseSession
+            if shouldCreateNew {
+                let newSession = SecureNoiseSession(
+                    peerID: peerID,
+                    role: .responder,
+                    keychain: keychain,
+                    localStaticKey: localStaticKey
+                )
+                sessions[peerID] = newSession
+                session = newSession
+            } else {
+                session = existingSession!
+            }
+            
+            // Process the handshake message within the synchronized block
+            do {
+                let response = try session.processHandshakeMessage(message)
+                
+                // Check if session is established after processing
+                if session.isEstablished() {
+                    if let remoteKey = session.getRemoteStaticPublicKey() {
+                        // Schedule callback outside the synchronized block to prevent deadlock
+                        DispatchQueue.global().async { [weak self] in
+                            self?.onSessionEstablished?(peerID, remoteKey)
+                        }
+                    }
+                }
+                
+                return response
+            } catch {
+                // Reset the session on handshake failure so next attempt can start fresh
+                _ = sessions.removeValue(forKey: peerID)
+                
+                // Schedule callback outside the synchronized block to prevent deadlock
+                DispatchQueue.global().async { [weak self] in
+                    self?.onSessionFailed?(peerID, error)
+                }
+                
+                SecureLogger.error(.handshakeFailed(peerID: peerID.id, error: error.localizedDescription))
+                throw error
+            }
+        }
+    }
+    
+    // MARK: - Encryption/Decryption
+    
+    func encrypt(_ plaintext: Data, for peerID: PeerID) throws -> Data {
+        guard let session = getSession(for: peerID) else {
+            throw NoiseSessionError.sessionNotFound
+        }
+        
+        return try session.encrypt(plaintext)
+    }
+    
+    func decrypt(_ ciphertext: Data, from peerID: PeerID) throws -> Data {
+        guard let session = getSession(for: peerID) else {
+            throw NoiseSessionError.sessionNotFound
+        }
+        
+        return try session.decrypt(ciphertext)
+    }
+    
+    // MARK: - Key Management
+    
+    func getRemoteStaticKey(for peerID: PeerID) -> Curve25519.KeyAgreement.PublicKey? {
+        return getSession(for: peerID)?.getRemoteStaticPublicKey()
+    }
+    
+    // MARK: - Session Rekeying
+    
+    func getSessionsNeedingRekey() -> [(peerID: PeerID, needsRekey: Bool)] {
+        return managerQueue.sync {
+            var needingRekey: [(peerID: PeerID, needsRekey: Bool)] = []
+            
+            for (peerID, session) in sessions {
+                if let secureSession = session as? SecureNoiseSession,
+                   secureSession.isEstablished(),
+                   secureSession.needsRenegotiation() {
+                    needingRekey.append((peerID: peerID, needsRekey: true))
+                }
+            }
+            
+            return needingRekey
+        }
+    }
+    
+    func initiateRekey(for peerID: PeerID) throws {
+        // Remove old session
+        removeSession(for: peerID)
+        
+        // Initiate new handshake
+        _ = try initiateHandshake(with: peerID)
+    }
+}

bitchat/Noise/NoiseSessionState.swift

@@ -0,0 +1,13 @@
+//
+// NoiseSessionState.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+enum NoiseSessionState: Equatable {
+    case uninitialized
+    case handshaking
+    case established
+}

bitchat/Noise/SecureNoiseSession.swift

@@ -0,0 +1,81 @@
+//
+// SecureNoiseSession.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+
+final class SecureNoiseSession: NoiseSession {
+    private(set) var messageCount: UInt64 = 0
+    private let sessionStartTime = Date()
+    private(set) var lastActivityTime = Date()
+    
+    override func encrypt(_ plaintext: Data) throws -> Data {
+        // Check session age
+        if Date().timeIntervalSince(sessionStartTime) > NoiseSecurityConstants.sessionTimeout {
+            throw NoiseSecurityError.sessionExpired
+        }
+        
+        // Check message count
+        if messageCount >= NoiseSecurityConstants.maxMessagesPerSession {
+            throw NoiseSecurityError.sessionExhausted
+        }
+        
+        // Validate message size
+        guard NoiseSecurityValidator.validateMessageSize(plaintext) else {
+            throw NoiseSecurityError.messageTooLarge
+        }
+        
+        let encrypted = try super.encrypt(plaintext)
+        messageCount += 1
+        lastActivityTime = Date()
+        
+        return encrypted
+    }
+    
+    override func decrypt(_ ciphertext: Data) throws -> Data {
+        // Check session age
+        if Date().timeIntervalSince(sessionStartTime) > NoiseSecurityConstants.sessionTimeout {
+            throw NoiseSecurityError.sessionExpired
+        }
+        
+        // Validate message size
+        guard NoiseSecurityValidator.validateMessageSize(ciphertext) else {
+            throw NoiseSecurityError.messageTooLarge
+        }
+        
+        let decrypted = try super.decrypt(ciphertext)
+        lastActivityTime = Date()
+        
+        return decrypted
+    }
+    
+    func needsRenegotiation() -> Bool {
+        // Check if we've used more than 90% of message limit
+        let messageThreshold = UInt64(Double(NoiseSecurityConstants.maxMessagesPerSession) * 0.9)
+        if messageCount >= messageThreshold {
+            return true
+        }
+        
+        // Check if last activity was more than 30 minutes ago
+        if Date().timeIntervalSince(lastActivityTime) > NoiseSecurityConstants.sessionTimeout {
+            return true
+        }
+        
+        return false
+    }
+    
+    // MARK: - Testing Support
+    #if DEBUG
+    func setLastActivityTimeForTesting(_ date: Date) {
+        lastActivityTime = date
+    }
+    
+    func setMessageCountForTesting(_ count: UInt64) {
+        messageCount = count
+    }
+    #endif
+}

bitchat/Nostr/Bech32.swift

@@ -0,0 +1,135 @@
+import Foundation
+
+/// Bech32 encoding for Nostr (minimal implementation)
+enum Bech32 {
+    private static let charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
+    private static let generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
+    
+    static func encode(hrp: String, data: Data) throws -> String {
+        let values = convertBits(from: 8, to: 5, pad: true, data: Array(data))
+        let checksum = createChecksum(hrp: hrp, values: values)
+        let combined = values + checksum
+        
+        return hrp + "1" + combined.map { 
+            let index = charset.index(charset.startIndex, offsetBy: Int($0))
+            return String(charset[index])
+        }.joined()
+    }
+    
+    static func decode(_ bech32String: String) throws -> (hrp: String, data: Data) {
+        // Find the last occurrence of '1'
+        guard let separatorIndex = bech32String.lastIndex(of: "1") else {
+            throw Bech32Error.invalidFormat
+        }
+        
+        let hrp = String(bech32String[..<separatorIndex])
+        
+        // Validate HRP contains only ASCII characters
+        for char in hrp {
+            guard char.asciiValue != nil else {
+                throw Bech32Error.invalidCharacter
+            }
+        }
+        
+        let dataString = String(bech32String[bech32String.index(after: separatorIndex)...])
+        
+        // Convert characters to values
+        var values = [UInt8]()
+        for char in dataString {
+            guard let index = charset.firstIndex(of: char) else {
+                throw Bech32Error.invalidCharacter
+            }
+            values.append(UInt8(charset.distance(from: charset.startIndex, to: index)))
+        }
+        
+        // Verify checksum
+        guard values.count >= 6 else {
+            throw Bech32Error.invalidChecksum
+        }
+        
+        let payloadValues = Array(values.dropLast(6))
+        let checksum = Array(values.suffix(6))
+        let expectedChecksum = createChecksum(hrp: hrp, values: payloadValues)
+        
+        guard checksum == expectedChecksum else {
+            throw Bech32Error.invalidChecksum
+        }
+        
+        // Convert back to bytes
+        let bytes = convertBits(from: 5, to: 8, pad: false, data: payloadValues)
+        return (hrp: hrp, data: Data(bytes))
+    }
+    
+    enum Bech32Error: Error {
+        case invalidFormat
+        case invalidCharacter
+        case invalidChecksum
+    }
+    
+    private static func convertBits(from: Int, to: Int, pad: Bool, data: [UInt8]) -> [UInt8] {
+        var acc = 0
+        var bits = 0
+        var result = [UInt8]()
+        let maxv = (1 << to) - 1
+        
+        for value in data {
+            acc = (acc << from) | Int(value)
+            bits += from
+            
+            while bits >= to {
+                bits -= to
+                result.append(UInt8((acc >> bits) & maxv))
+            }
+        }
+        
+        if pad && bits > 0 {
+            result.append(UInt8((acc << (to - bits)) & maxv))
+        }
+        
+        return result
+    }
+    
+    private static func createChecksum(hrp: String, values: [UInt8]) -> [UInt8] {
+        let checksumValues = hrpExpand(hrp) + values + [0, 0, 0, 0, 0, 0]
+        let polymod = polymod(checksumValues) ^ 1
+        var checksum = [UInt8]()
+        
+        for i in 0..<6 {
+            checksum.append(UInt8((polymod >> (5 * (5 - i))) & 31))
+        }
+        
+        return checksum
+    }
+    
+    private static func hrpExpand(_ hrp: String) -> [UInt8] {
+        var result = [UInt8]()
+        for c in hrp {
+            guard let asciiValue = c.asciiValue else {
+                return [] // Return empty array for invalid input
+            }
+            result.append(UInt8(asciiValue >> 5))
+        }
+        result.append(0)
+        for c in hrp {
+            guard let asciiValue = c.asciiValue else {
+                return [] // Return empty array for invalid input
+            }
+            result.append(UInt8(asciiValue & 31))
+        }
+        return result
+    }
+    
+    private static func polymod(_ values: [UInt8]) -> Int {
+        var chk = 1
+        for value in values {
+            let b = chk >> 25
+            chk = (chk & 0x1ffffff) << 5 ^ Int(value)
+            for i in 0..<5 {
+                if (b >> i) & 1 == 1 {
+                    chk ^= generator[i]
+                }
+            }
+        }
+        return chk
+    }
+}

bitchat/Nostr/GeoRelayDirectory.swift

@@ -0,0 +1,345 @@
+import BitLogger
+import Foundation
+import Tor
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
+
+/// Directory of online Nostr relays with approximate GPS locations, used for geohash routing.
+@MainActor
+final class GeoRelayDirectory {
+    struct Entry: Hashable {
+        let host: String
+        let lat: Double
+        let lon: Double
+    }
+
+    static let shared = GeoRelayDirectory()
+
+    private(set) var entries: [Entry] = []
+    private let cacheFileName = "georelays_cache.csv"
+    private let lastFetchKey = "georelay.lastFetchAt"
+    private let remoteURL = URL(string: "https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv")!
+    private let fetchInterval: TimeInterval = TransportConfig.geoRelayFetchIntervalSeconds
+
+    private var refreshTimer: Timer?
+    private var retryTask: Task<Void, Never>?
+    private var retryAttempt: Int = 0
+    private var isFetching: Bool = false
+    private var observers: [NSObjectProtocol] = []
+
+    private init() {
+        entries = loadLocalEntries()
+        registerObservers()
+        startRefreshTimer()
+        prefetchIfNeeded()
+    }
+
+    deinit {
+        observers.forEach { NotificationCenter.default.removeObserver($0) }
+        refreshTimer?.invalidate()
+        retryTask?.cancel()
+    }
+
+    /// Returns up to `count` relay URLs (wss://) closest to the geohash center.
+    func closestRelays(toGeohash geohash: String, count: Int = 5) -> [String] {
+        let center = Geohash.decodeCenter(geohash)
+        return closestRelays(toLat: center.lat, lon: center.lon, count: count)
+    }
+
+    /// Returns up to `count` relay URLs (wss://) closest to the given coordinate.
+    func closestRelays(toLat lat: Double, lon: Double, count: Int = 5) -> [String] {
+        guard !entries.isEmpty, count > 0 else { return [] }
+
+        if entries.count <= count {
+            return entries
+                .sorted { a, b in
+                    haversineKm(lat, lon, a.lat, a.lon) < haversineKm(lat, lon, b.lat, b.lon)
+                }
+                .map { "wss://\($0.host)" }
+        }
+
+        var best: [(entry: Entry, distance: Double)] = []
+        best.reserveCapacity(count)
+
+        for entry in entries {
+            let distance = haversineKm(lat, lon, entry.lat, entry.lon)
+            if best.count < count {
+                let idx = best.firstIndex { $0.distance > distance } ?? best.count
+                best.insert((entry, distance), at: idx)
+            } else if let worstDistance = best.last?.distance, distance < worstDistance {
+                let idx = best.firstIndex { $0.distance > distance } ?? best.count
+                best.insert((entry, distance), at: idx)
+                best.removeLast()
+            }
+        }
+
+        return best.map { "wss://\($0.entry.host)" }
+    }
+
+    // MARK: - Remote Fetch
+    func prefetchIfNeeded(force: Bool = false) {
+        guard !isFetching else { return }
+
+        let now = Date()
+        let last = UserDefaults.standard.object(forKey: lastFetchKey) as? Date ?? .distantPast
+
+        if !force {
+            guard now.timeIntervalSince(last) >= fetchInterval else { return }
+        } else if last != .distantPast,
+                  now.timeIntervalSince(last) < TransportConfig.geoRelayRetryInitialSeconds {
+            // Skip forced fetches if we just refreshed moments ago.
+            return
+        }
+
+        cancelRetry()
+        fetchRemote()
+    }
+
+    private func fetchRemote() {
+        guard !isFetching else { return }
+        isFetching = true
+
+        let request = URLRequest(
+            url: remoteURL,
+            cachePolicy: .reloadIgnoringLocalCacheData,
+            timeoutInterval: 15
+        )
+
+        Task.detached { [weak self] in
+            guard let self else { return }
+
+            let ready = await TorManager.shared.awaitReady()
+            if !ready {
+                await self.handleFetchFailure(.torNotReady)
+                return
+            }
+
+            do {
+                let (data, _) = try await TorURLSession.shared.session.data(for: request)
+                guard let text = String(data: data, encoding: .utf8) else {
+                    await self.handleFetchFailure(.invalidData)
+                    return
+                }
+
+                let parsed = GeoRelayDirectory.parseCSV(text)
+                guard !parsed.isEmpty else {
+                    await self.handleFetchFailure(.invalidData)
+                    return
+                }
+
+                await self.handleFetchSuccess(entries: parsed, csv: text)
+            } catch {
+                await self.handleFetchFailure(.network(error))
+            }
+        }
+    }
+
+    private enum FetchFailure {
+        case torNotReady
+        case invalidData
+        case network(Error)
+    }
+
+    @MainActor
+    private func handleFetchSuccess(entries parsed: [Entry], csv: String) {
+        entries = parsed
+        persistCache(csv)
+        UserDefaults.standard.set(Date(), forKey: lastFetchKey)
+        SecureLogger.info("GeoRelayDirectory: refreshed \(parsed.count) relays from remote", category: .session)
+        isFetching = false
+        retryAttempt = 0
+        cancelRetry()
+    }
+
+    @MainActor
+    private func handleFetchFailure(_ reason: FetchFailure) {
+        switch reason {
+        case .torNotReady:
+            SecureLogger.warning("GeoRelayDirectory: Tor not ready; scheduling retry", category: .session)
+        case .invalidData:
+            SecureLogger.warning("GeoRelayDirectory: remote fetch returned invalid data; scheduling retry", category: .session)
+        case .network(let error):
+            SecureLogger.warning("GeoRelayDirectory: remote fetch failed with error: \(error.localizedDescription)", category: .session)
+        }
+        isFetching = false
+        scheduleRetry()
+    }
+
+    @MainActor
+    private func scheduleRetry() {
+        retryAttempt = min(retryAttempt + 1, 10)
+        let base = TransportConfig.geoRelayRetryInitialSeconds
+        let maxDelay = TransportConfig.geoRelayRetryMaxSeconds
+        let multiplier = pow(2.0, Double(max(retryAttempt - 1, 0)))
+        let calculated = base * multiplier
+        let delay = min(maxDelay, max(base, calculated))
+
+        cancelRetry()
+        retryTask = Task { [weak self] in
+            let nanoseconds = UInt64(delay * 1_000_000_000)
+            try? await Task.sleep(nanoseconds: nanoseconds)
+            await MainActor.run {
+                self?.prefetchIfNeeded(force: true)
+            }
+        }
+    }
+
+    @MainActor
+    private func cancelRetry() {
+        retryTask?.cancel()
+        retryTask = nil
+    }
+
+    private func persistCache(_ text: String) {
+        guard let url = cacheURL() else { return }
+        do {
+            try text.data(using: .utf8)?.write(to: url, options: .atomic)
+        } catch {
+            SecureLogger.warning("GeoRelayDirectory: failed to write cache: \(error)", category: .session)
+        }
+    }
+
+    // MARK: - Loading
+    private func loadLocalEntries() -> [Entry] {
+        // Prefer cached file if present
+        if let cache = cacheURL(),
+           let data = try? Data(contentsOf: cache),
+           let text = String(data: data, encoding: .utf8) {
+            let arr = Self.parseCSV(text)
+            if !arr.isEmpty { return arr }
+        }
+
+        // Try bundled resource(s)
+        let bundleCandidates = [
+            Bundle.main.url(forResource: "nostr_relays", withExtension: "csv"),
+            Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv"),
+            Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv", subdirectory: "relays")
+        ].compactMap { $0 }
+
+        for url in bundleCandidates {
+            if let data = try? Data(contentsOf: url),
+               let text = String(data: data, encoding: .utf8) {
+                let arr = Self.parseCSV(text)
+                if !arr.isEmpty { return arr }
+            }
+        }
+
+        // Try filesystem path (development/test)
+        if let cwd = FileManager.default.currentDirectoryPath as String?,
+           let data = try? Data(contentsOf: URL(fileURLWithPath: cwd).appendingPathComponent("relays/online_relays_gps.csv")),
+           let text = String(data: data, encoding: .utf8) {
+            return Self.parseCSV(text)
+        }
+
+        SecureLogger.warning("GeoRelayDirectory: no local CSV found; entries empty", category: .session)
+        return []
+    }
+
+    nonisolated static func parseCSV(_ text: String) -> [Entry] {
+        var result: Set<Entry> = []
+        let lines = text.split(whereSeparator: { $0.isNewline })
+        for (idx, raw) in lines.enumerated() {
+            let line = raw.trimmingCharacters(in: .whitespacesAndNewlines)
+            if line.isEmpty { continue }
+            if idx == 0 && line.lowercased().contains("relay url") { continue }
+            let parts = line.split(separator: ",").map { String($0).trimmingCharacters(in: .whitespaces) }
+            guard parts.count >= 3 else { continue }
+            var host = parts[0]
+            host = host.replacingOccurrences(of: "https://", with: "")
+            host = host.replacingOccurrences(of: "http://", with: "")
+            host = host.replacingOccurrences(of: "wss://", with: "")
+            host = host.replacingOccurrences(of: "ws://", with: "")
+            host = host.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
+            guard let lat = Double(parts[1]), let lon = Double(parts[2]) else { continue }
+            result.insert(Entry(host: host, lat: lat, lon: lon))
+        }
+        return Array(result)
+    }
+
+    private func cacheURL() -> URL? {
+        do {
+            let base = try FileManager.default.url(
+                for: .applicationSupportDirectory,
+                in: .userDomainMask,
+                appropriateFor: nil,
+                create: true
+            )
+            let dir = base.appendingPathComponent("bitchat", isDirectory: true)
+            try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+            return dir.appendingPathComponent(cacheFileName)
+        } catch {
+            return nil
+        }
+    }
+
+    // MARK: - Observers & Timers
+    private func registerObservers() {
+        let center = NotificationCenter.default
+
+        let torReady = center.addObserver(
+            forName: .TorDidBecomeReady,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            guard let self else { return }
+            Task { @MainActor in
+                self.prefetchIfNeeded(force: true)
+            }
+        }
+        observers.append(torReady)
+
+#if os(iOS)
+        let didBecomeActive = center.addObserver(
+            forName: UIApplication.didBecomeActiveNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            guard let self else { return }
+            Task { @MainActor in
+                self.prefetchIfNeeded()
+            }
+        }
+        observers.append(didBecomeActive)
+#elseif os(macOS)
+        let didBecomeActive = center.addObserver(
+            forName: NSApplication.didBecomeActiveNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            guard let self else { return }
+            Task { @MainActor in
+                self.prefetchIfNeeded()
+            }
+        }
+        observers.append(didBecomeActive)
+#endif
+    }
+
+    private func startRefreshTimer() {
+        refreshTimer?.invalidate()
+        let interval = TransportConfig.geoRelayRefreshCheckIntervalSeconds
+        guard interval > 0 else { return }
+
+        let timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
+            guard let self else { return }
+            Task { @MainActor in
+                self.prefetchIfNeeded()
+            }
+        }
+        refreshTimer = timer
+        RunLoop.main.add(timer, forMode: .common)
+    }
+}
+
+// MARK: - Distance
+private func haversineKm(_ lat1: Double, _ lon1: Double, _ lat2: Double, _ lon2: Double) -> Double {
+    let r = 6371.0 // Earth radius in km
+    let dLat = (lat2 - lat1) * .pi / 180
+    let dLon = (lon2 - lon1) * .pi / 180
+    let a = sin(dLat/2) * sin(dLat/2) + cos(lat1 * .pi/180) * cos(lat2 * .pi/180) * sin(dLon/2) * sin(dLon/2)
+    let c = 2 * atan2(sqrt(a), sqrt(1 - a))
+    return r * c
+}

bitchat/Nostr/KeychainHelper.swift

@@ -0,0 +1,50 @@
+import Foundation
+
+protocol KeychainHelperProtocol {
+    func save(key: String, data: Data, service: String, accessible: CFString?)
+    func load(key: String, service: String) -> Data?
+    func delete(key: String, service: String)
+}
+
+/// Keychain helper for secure storage
+struct KeychainHelper: KeychainHelperProtocol {
+    func save(key: String, data: Data, service: String, accessible: CFString? = nil) {
+        var query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: key,
+            kSecValueData as String: data
+        ]
+        if let accessible = accessible {
+            query[kSecAttrAccessible as String] = accessible
+        }
+        
+        SecItemDelete(query as CFDictionary)
+        SecItemAdd(query as CFDictionary, nil)
+    }
+    
+    func load(key: String, service: String) -> Data? {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: key,
+            kSecReturnData as String: true
+        ]
+        
+        var result: AnyObject?
+        let status = SecItemCopyMatching(query as CFDictionary, &result)
+        
+        guard status == errSecSuccess else { return nil }
+        return result as? Data
+    }
+    
+    func delete(key: String, service: String) {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: key
+        ]
+        
+        SecItemDelete(query as CFDictionary)
+    }
+}

bitchat/Nostr/NostrEmbeddedBitChat.swift

@@ -0,0 +1,121 @@
+import Foundation
+
+// MARK: - BitChat-over-Nostr Adapter
+
+struct NostrEmbeddedBitChat {
+    /// Build a `bitchat1:` base64url-encoded BitChat packet carrying a private message for Nostr DMs.
+    static func encodePMForNostr(content: String, messageID: String, recipientPeerID: PeerID, senderPeerID: PeerID) -> String? {
+        // TLV-encode the private message
+        let pm = PrivateMessagePacket(messageID: messageID, content: content)
+        guard let tlv = pm.encode() else { return nil }
+
+        // Prefix with NoisePayloadType
+        var payload = Data([NoisePayloadType.privateMessage.rawValue])
+        payload.append(tlv)
+
+        // Determine 8-byte recipient ID to embed
+        let recipientID = normalizeRecipientPeerID(recipientPeerID)
+
+        let packet = BitchatPacket(
+            type: MessageType.noiseEncrypted.rawValue,
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: Data(hexString: recipientID.id),
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: payload,
+            signature: nil,
+            ttl: 7
+        )
+
+        guard let data = packet.toBinaryData() else { return nil }
+        return "bitchat1:" + base64URLEncode(data)
+    }
+
+    /// Build a `bitchat1:` base64url-encoded BitChat packet carrying a delivery/read ack for Nostr DMs.
+    static func encodeAckForNostr(type: NoisePayloadType, messageID: String, recipientPeerID: PeerID, senderPeerID: PeerID) -> String? {
+        guard type == .delivered || type == .readReceipt else { return nil }
+
+        var payload = Data([type.rawValue])
+        payload.append(Data(messageID.utf8))
+
+        let recipientID = normalizeRecipientPeerID(recipientPeerID)
+
+        let packet = BitchatPacket(
+            type: MessageType.noiseEncrypted.rawValue,
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: Data(hexString: recipientID.id),
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: payload,
+            signature: nil,
+            ttl: 7
+        )
+
+        guard let data = packet.toBinaryData() else { return nil }
+        return "bitchat1:" + base64URLEncode(data)
+    }
+
+    /// Build a `bitchat1:` ACK (delivered/read) without an embedded recipient peer ID (geohash DMs).
+    static func encodeAckForNostrNoRecipient(type: NoisePayloadType, messageID: String, senderPeerID: PeerID) -> String? {
+        guard type == .delivered || type == .readReceipt else { return nil }
+
+        var payload = Data([type.rawValue])
+        payload.append(Data(messageID.utf8))
+
+        let packet = BitchatPacket(
+            type: MessageType.noiseEncrypted.rawValue,
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: nil,
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: payload,
+            signature: nil,
+            ttl: 7
+        )
+
+        guard let data = packet.toBinaryData() else { return nil }
+        return "bitchat1:" + base64URLEncode(data)
+    }
+
+    /// Build a `bitchat1:` payload without an embedded recipient peer ID (used for geohash DMs).
+    static func encodePMForNostrNoRecipient(content: String, messageID: String, senderPeerID: PeerID) -> String? {
+        let pm = PrivateMessagePacket(messageID: messageID, content: content)
+        guard let tlv = pm.encode() else { return nil }
+
+        var payload = Data([NoisePayloadType.privateMessage.rawValue])
+        payload.append(tlv)
+
+        let packet = BitchatPacket(
+            type: MessageType.noiseEncrypted.rawValue,
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: nil,
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: payload,
+            signature: nil,
+            ttl: 7
+        )
+
+        guard let data = packet.toBinaryData() else { return nil }
+        return "bitchat1:" + base64URLEncode(data)
+    }
+
+    private static func normalizeRecipientPeerID(_ recipientPeerID: PeerID) -> PeerID {
+        if let maybeData = Data(hexString: recipientPeerID.id) {
+            if maybeData.count == 32 {
+                // Treat as Noise static public key; derive peerID from fingerprint
+                return PeerID(publicKey: maybeData)
+            } else if maybeData.count == 8 {
+                // Already an 8-byte peer ID
+                return recipientPeerID
+            }
+        }
+        // Fallback: return as-is (expecting 16 hex chars) – caller should pass a valid peer ID
+        return recipientPeerID
+    }
+
+    /// Base64url encode without padding
+    private static func base64URLEncode(_ data: Data) -> String {
+        let b64 = data.base64EncodedString()
+        return b64
+            .replacingOccurrences(of: "+", with: "-")
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "=", with: "")
+    }
+}

bitchat/Nostr/NostrIdentity.swift

@@ -1,47 +1,6 @@
 import Foundation
-import CryptoKit
 import P256K
 
-// Keychain helper for secure storage
-struct KeychainHelper {
-    static func save(key: String, data: Data, service: String) {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key,
-            kSecValueData as String: data
-        ]
-        
-        SecItemDelete(query as CFDictionary)
-        SecItemAdd(query as CFDictionary, nil)
-    }
-    
-    static func load(key: String, service: String) -> Data? {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key,
-            kSecReturnData as String: true
-        ]
-        
-        var result: AnyObject?
-        let status = SecItemCopyMatching(query as CFDictionary, &result)
-        
-        guard status == errSecSuccess else { return nil }
-        return result as? Data
-    }
-    
-    static func delete(key: String, service: String) {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key
-        ]
-        
-        SecItemDelete(query as CFDictionary)
-    }
-}
-
 /// Manages Nostr identity (secp256k1 keypair) for NIP-17 private messaging
 struct NostrIdentity: Codable {
     let privateKey: Data
@@ -99,167 +58,3 @@ struct NostrIdentity: Codable {
         return publicKey.hexEncodedString()
     }
 }
-
-/// Bridge between Noise and Nostr identities
-struct NostrIdentityBridge {
-    private static let keychainService = "chat.bitchat.nostr"
-    private static let currentIdentityKey = "nostr-current-identity"
-    
-    /// Get or create the current Nostr identity
-    static func getCurrentNostrIdentity() throws -> NostrIdentity? {
-        // Check if we already have a Nostr identity
-        if let existingData = KeychainHelper.load(key: currentIdentityKey, service: keychainService),
-           let identity = try? JSONDecoder().decode(NostrIdentity.self, from: existingData) {
-            return identity
-        }
-        
-        // Generate new Nostr identity
-        let nostrIdentity = try NostrIdentity.generate()
-        
-        // Store it
-        let data = try JSONEncoder().encode(nostrIdentity)
-        KeychainHelper.save(key: currentIdentityKey, data: data, service: keychainService)
-        
-        return nostrIdentity
-    }
-    
-    /// Associate a Nostr identity with a Noise public key (for favorites)
-    static func associateNostrIdentity(_ nostrPubkey: String, with noisePublicKey: Data) {
-        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
-        if let data = nostrPubkey.data(using: .utf8) {
-            KeychainHelper.save(key: key, data: data, service: keychainService)
-        }
-    }
-    
-    /// Get Nostr public key associated with a Noise public key
-    static func getNostrPublicKey(for noisePublicKey: Data) -> String? {
-        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
-        guard let data = KeychainHelper.load(key: key, service: keychainService),
-              let pubkey = String(data: data, encoding: .utf8) else {
-            return nil
-        }
-        return pubkey
-    }
-}
-
-// Bech32 encoding for Nostr (minimal implementation)
-enum Bech32 {
-    private static let charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
-    private static let generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
-    
-    static func encode(hrp: String, data: Data) throws -> String {
-        let values = convertBits(from: 8, to: 5, pad: true, data: Array(data))
-        let checksum = createChecksum(hrp: hrp, values: values)
-        let combined = values + checksum
-        
-        return hrp + "1" + combined.map { 
-            let index = charset.index(charset.startIndex, offsetBy: Int($0))
-            return String(charset[index])
-        }.joined()
-    }
-    
-    static func decode(_ bech32String: String) throws -> (hrp: String, data: Data) {
-        // Find the last occurrence of '1'
-        guard let separatorIndex = bech32String.lastIndex(of: "1") else {
-            throw Bech32Error.invalidFormat
-        }
-        
-        let hrp = String(bech32String[..<separatorIndex])
-        let dataString = String(bech32String[bech32String.index(after: separatorIndex)...])
-        
-        // Convert characters to values
-        var values = [UInt8]()
-        for char in dataString {
-            guard let index = charset.firstIndex(of: char) else {
-                throw Bech32Error.invalidCharacter
-            }
-            values.append(UInt8(charset.distance(from: charset.startIndex, to: index)))
-        }
-        
-        // Verify checksum
-        guard values.count >= 6 else {
-            throw Bech32Error.invalidChecksum
-        }
-        
-        let payloadValues = Array(values.dropLast(6))
-        let checksum = Array(values.suffix(6))
-        let expectedChecksum = createChecksum(hrp: hrp, values: payloadValues)
-        
-        guard checksum == expectedChecksum else {
-            throw Bech32Error.invalidChecksum
-        }
-        
-        // Convert back to bytes
-        let bytes = convertBits(from: 5, to: 8, pad: false, data: payloadValues)
-        return (hrp: hrp, data: Data(bytes))
-    }
-    
-    enum Bech32Error: Error {
-        case invalidFormat
-        case invalidCharacter
-        case invalidChecksum
-    }
-    
-    private static func convertBits(from: Int, to: Int, pad: Bool, data: [UInt8]) -> [UInt8] {
-        var acc = 0
-        var bits = 0
-        var result = [UInt8]()
-        let maxv = (1 << to) - 1
-        
-        for value in data {
-            acc = (acc << from) | Int(value)
-            bits += from
-            
-            while bits >= to {
-                bits -= to
-                result.append(UInt8((acc >> bits) & maxv))
-            }
-        }
-        
-        if pad && bits > 0 {
-            result.append(UInt8((acc << (to - bits)) & maxv))
-        }
-        
-        return result
-    }
-    
-    private static func createChecksum(hrp: String, values: [UInt8]) -> [UInt8] {
-        let checksumValues = hrpExpand(hrp) + values + [0, 0, 0, 0, 0, 0]
-        let polymod = polymod(checksumValues) ^ 1
-        var checksum = [UInt8]()
-        
-        for i in 0..<6 {
-            checksum.append(UInt8((polymod >> (5 * (5 - i))) & 31))
-        }
-        
-        return checksum
-    }
-    
-    private static func hrpExpand(_ hrp: String) -> [UInt8] {
-        var result = [UInt8]()
-        for c in hrp {
-            result.append(UInt8(c.asciiValue! >> 5))
-        }
-        result.append(0)
-        for c in hrp {
-            result.append(UInt8(c.asciiValue! & 31))
-        }
-        return result
-    }
-    
-    private static func polymod(_ values: [UInt8]) -> Int {
-        var chk = 1
-        for value in values {
-            let b = chk >> 25
-            chk = (chk & 0x1ffffff) << 5 ^ Int(value)
-            for i in 0..<5 {
-                if (b >> i) & 1 == 1 {
-                    chk ^= generator[i]
-                }
-            }
-        }
-        return chk
-    }
-}
-
-// Data hex encoding extension moved to BinaryEncodingUtils.swift to avoid duplication

bitchat/Nostr/NostrIdentityBridge.swift

@@ -0,0 +1,157 @@
+import Foundation
+import CryptoKit
+
+/// Bridge between Noise and Nostr identities
+final class NostrIdentityBridge {
+    private let keychainService = "chat.bitchat.nostr"
+    private let currentIdentityKey = "nostr-current-identity"
+    private let deviceSeedKey = "nostr-device-seed"
+    // In-memory cache to avoid transient keychain access issues
+    private var deviceSeedCache: Data?
+    // Cache derived identities to avoid repeated crypto during view rendering
+    private var derivedIdentityCache: [String: NostrIdentity] = [:]
+    private let cacheLock = NSLock()
+
+    private let keychain: KeychainHelperProtocol
+
+    init(keychain: KeychainHelperProtocol = KeychainHelper()) {
+        self.keychain = keychain
+    }
+    
+    /// Get or create the current Nostr identity
+    func getCurrentNostrIdentity() throws -> NostrIdentity? {
+        // Check if we already have a Nostr identity
+        if let existingData = keychain.load(key: currentIdentityKey, service: keychainService),
+           let identity = try? JSONDecoder().decode(NostrIdentity.self, from: existingData) {
+            return identity
+        }
+        
+        // Generate new Nostr identity
+        let nostrIdentity = try NostrIdentity.generate()
+        
+        // Store it
+        let data = try JSONEncoder().encode(nostrIdentity)
+        keychain.save(key: currentIdentityKey, data: data, service: keychainService, accessible: nil)
+        
+        return nostrIdentity
+    }
+    
+    /// Associate a Nostr identity with a Noise public key (for favorites)
+    func associateNostrIdentity(_ nostrPubkey: String, with noisePublicKey: Data) {
+        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
+        if let data = nostrPubkey.data(using: .utf8) {
+            keychain.save(key: key, data: data, service: keychainService, accessible: nil)
+        }
+    }
+    
+    /// Get Nostr public key associated with a Noise public key
+    func getNostrPublicKey(for noisePublicKey: Data) -> String? {
+        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
+        guard let data = keychain.load(key: key, service: keychainService),
+              let pubkey = String(data: data, encoding: .utf8) else {
+            return nil
+        }
+        return pubkey
+    }
+    
+    /// Clear all Nostr identity associations and current identity
+    func clearAllAssociations() {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: keychainService,
+            kSecMatchLimit as String: kSecMatchLimitAll,
+            kSecReturnAttributes as String: true
+        ]
+
+        var result: AnyObject?
+        let status = SecItemCopyMatching(query as CFDictionary, &result)
+        if status == errSecSuccess, let items = result as? [[String: Any]] {
+            for item in items {
+                var deleteQuery: [String: Any] = [
+                    kSecClass as String: kSecClassGenericPassword,
+                    kSecAttrService as String: keychainService
+                ]
+                if let account = item[kSecAttrAccount as String] as? String {
+                    deleteQuery[kSecAttrAccount as String] = account
+                }
+                SecItemDelete(deleteQuery as CFDictionary)
+            }
+        } else if status == errSecItemNotFound {
+            // nothing persisted; no action needed
+        }
+
+        deviceSeedCache = nil
+    }
+
+    // MARK: - Per-Geohash Identities (Location Channels)
+
+    /// Returns a stable device seed used to derive unlinkable per-geohash identities.
+    /// Stored only on device keychain.
+    private func getOrCreateDeviceSeed() -> Data {
+        if let cached = deviceSeedCache { return cached }
+        if let existing = keychain.load(key: deviceSeedKey, service: keychainService) {
+            // Migrate to AfterFirstUnlockThisDeviceOnly for stability during lock
+            keychain.save(key: deviceSeedKey, data: existing, service: keychainService, accessible: kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly)
+            deviceSeedCache = existing
+            return existing
+        }
+        var seed = Data(count: 32)
+        _ = seed.withUnsafeMutableBytes { ptr in
+            SecRandomCopyBytes(kSecRandomDefault, 32, ptr.baseAddress!)
+        }
+        // Ensure availability after first unlock to prevent unintended rotation when locked
+        keychain.save(key: deviceSeedKey, data: seed, service: keychainService, accessible: kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly)
+        deviceSeedCache = seed
+        return seed
+    }
+
+    /// Derive a deterministic, unlinkable Nostr identity for a given geohash.
+    /// Uses HMAC-SHA256(deviceSeed, geohash) as private key material, with fallback rehashing
+    /// if the candidate is not a valid secp256k1 private key.
+    func deriveIdentity(forGeohash geohash: String) throws -> NostrIdentity {
+        // Check cache first to avoid repeated crypto + keychain I/O during view rendering
+        cacheLock.lock()
+        if let cached = derivedIdentityCache[geohash] {
+            cacheLock.unlock()
+            return cached
+        }
+        cacheLock.unlock()
+
+        let seed = getOrCreateDeviceSeed()
+        guard let msg = geohash.data(using: .utf8) else {
+            throw NSError(domain: "NostrIdentity", code: -1, userInfo: [NSLocalizedDescriptionKey: "Invalid geohash string"])
+        }
+
+        func candidateKey(iteration: UInt32) -> Data {
+            var input = Data(msg)
+            var iterBE = iteration.bigEndian
+            withUnsafeBytes(of: &iterBE) { bytes in
+                input.append(contentsOf: bytes)
+            }
+            let code = HMAC<SHA256>.authenticationCode(for: input, using: SymmetricKey(data: seed))
+            return Data(code)
+        }
+
+        // Try a few iterations to ensure a valid key can be formed
+        for i in 0..<10 {
+            let keyData = candidateKey(iteration: UInt32(i))
+            if let identity = try? NostrIdentity(privateKeyData: keyData) {
+                // Cache the result
+                cacheLock.lock()
+                derivedIdentityCache[geohash] = identity
+                cacheLock.unlock()
+                return identity
+            }
+        }
+        // As a final fallback, hash the seed+msg and try again
+        let fallback = (seed + msg).sha256Hash()
+        let identity = try NostrIdentity(privateKeyData: fallback)
+
+        // Cache the result
+        cacheLock.lock()
+        derivedIdentityCache[geohash] = identity
+        cacheLock.unlock()
+
+        return identity
+    }
+}

bitchat/Nostr/NostrProtocol.swift

@@ -1,6 +1,8 @@
+import BitLogger
 import Foundation
 import CryptoKit
 import P256K
+import Security
 
 // Note: This file depends on Data extension from BinaryEncodingUtils.swift
 // Make sure BinaryEncodingUtils.swift is included in the target
@@ -12,8 +14,9 @@ struct NostrProtocol {
     enum EventKind: Int {
         case metadata = 0
         case textNote = 1
+        case dm = 14 // NIP-17 DM rumor kind
         case seal = 13 // NIP-17 sealed event
-        case giftWrap = 1059 // NIP-17 gift wrap
+        case giftWrap = 1059 // NIP-59 gift wrap
         case ephemeralEvent = 20000
     }
     
@@ -30,14 +33,13 @@ struct NostrProtocol {
         let rumor = NostrEvent(
             pubkey: senderIdentity.publicKeyHex,
             createdAt: Date(),
-            kind: .textNote,
+            kind: .dm, // NIP-17: DM rumor kind 14
             tags: [],
             content: content
         )
         
         // 2. Create ephemeral key for this message
         let ephemeralKey = try P256K.Schnorr.PrivateKey()
-        let _ = Data(ephemeralKey.xonly.bytes).hexEncodedString()
         // Created ephemeral key for seal
         
         // 3. Seal the rumor (encrypt to recipient)
@@ -60,10 +62,11 @@ struct NostrProtocol {
     }
     
     /// Decrypt a received NIP-17 message
+    /// Returns the content, sender pubkey, and the actual message timestamp (not the randomized gift wrap timestamp)
     static func decryptPrivateMessage(
         giftWrap: NostrEvent,
         recipientIdentity: NostrIdentity
-    ) throws -> (content: String, senderPubkey: String) {
+    ) throws -> (content: String, senderPubkey: String, timestamp: Int) {
         
         // Starting decryption
         
@@ -76,8 +79,7 @@ struct NostrProtocol {
             )
             // Successfully unwrapped gift wrap
         } catch {
-            SecureLogger.log("❌ Failed to unwrap gift wrap: \(error)", 
-                            category: SecureLogger.session, level: .error)
+            SecureLogger.error("❌ Failed to unwrap gift wrap: \(error)", category: .session)
             throw error
         }
         
@@ -90,12 +92,59 @@ struct NostrProtocol {
             )
             // Successfully opened seal
         } catch {
-            SecureLogger.log("❌ Failed to open seal: \(error)", 
-                            category: SecureLogger.session, level: .error)
+            SecureLogger.error("❌ Failed to open seal: \(error)", category: .session)
             throw error
         }
         
-        return (content: rumor.content, senderPubkey: rumor.pubkey)
+        return (content: rumor.content, senderPubkey: rumor.pubkey, timestamp: rumor.created_at)
+    }
+
+    /// Create a geohash-scoped ephemeral public message (kind 20000)
+    static func createEphemeralGeohashEvent(
+        content: String,
+        geohash: String,
+        senderIdentity: NostrIdentity,
+        nickname: String? = nil,
+        teleported: Bool = false
+    ) throws -> NostrEvent {
+        var tags = [["g", geohash]]
+        if let nickname = nickname?.trimmingCharacters(in: .whitespacesAndNewlines), !nickname.isEmpty {
+            tags.append(["n", nickname])
+        }
+        if teleported {
+            tags.append(["t", "teleport"])
+        }
+        let event = NostrEvent(
+            pubkey: senderIdentity.publicKeyHex,
+            createdAt: Date(),
+            kind: .ephemeralEvent,
+            tags: tags,
+            content: content
+        )
+        let schnorrKey = try senderIdentity.schnorrSigningKey()
+        return try event.sign(with: schnorrKey)
+    }
+
+    /// Create a persistent location note (kind 1: text note) tagged to a street-level geohash.
+    static func createGeohashTextNote(
+        content: String,
+        geohash: String,
+        senderIdentity: NostrIdentity,
+        nickname: String? = nil
+    ) throws -> NostrEvent {
+        var tags = [["g", geohash]]
+        if let nickname = nickname?.trimmingCharacters(in: .whitespacesAndNewlines), !nickname.isEmpty {
+            tags.append(["n", nickname])
+        }
+        let event = NostrEvent(
+            pubkey: senderIdentity.publicKeyHex,
+            createdAt: Date(),
+            kind: .textNote,
+            tags: tags,
+            content: content
+        )
+        let schnorrKey = try senderIdentity.schnorrSigningKey()
+        return try event.sign(with: schnorrKey)
     }
     
     // MARK: - Private Methods
@@ -121,9 +170,8 @@ struct NostrProtocol {
             content: encrypted
         )
         
-        // Convert to P256K.Signing.PrivateKey for signing (temporary until we update sign method)
-        let signingKey = try P256K.Signing.PrivateKey(dataRepresentation: senderKey.dataRepresentation)
-        return try seal.sign(with: signingKey)
+        // Sign the seal with the sender's Schnorr private key
+        return try seal.sign(with: senderKey)
     }
     
     private static func createGiftWrap(
@@ -153,9 +201,8 @@ struct NostrProtocol {
             content: encrypted
         )
         
-        // Convert to P256K.Signing.PrivateKey for signing (temporary until we update sign method)
-        let signingKey = try P256K.Signing.PrivateKey(dataRepresentation: wrapKey.dataRepresentation)
-        return try giftWrap.sign(with: signingKey)
+        // Sign the gift wrap with the wrap Schnorr private key
+        return try giftWrap.sign(with: wrapKey)
     }
     
     private static func unwrapGiftWrap(
@@ -201,7 +248,7 @@ struct NostrProtocol {
         return try NostrEvent(from: rumorDict)
     }
     
-    // MARK: - Encryption (NIP-44 style)
+    // MARK: - Encryption (NIP-44 v2)
     
     private static func encrypt(
         plaintext: String,
@@ -213,34 +260,31 @@ struct NostrProtocol {
             throw NostrError.invalidPublicKey
         }
         
-        let _ = Data(senderKey.xonly.bytes).hexEncodedString()
-        // Encrypting message
+        // Encrypting message (NIP-44 v2: XChaCha20-Poly1305, versioned)
         
         // Derive shared secret
         let sharedSecret = try deriveSharedSecret(
             privateKey: senderKey,
             publicKey: recipientPubkeyData
         )
+        // Derive NIP-44 v2 symmetric key (HKDF-SHA256 with label in info)
+        let key = try deriveNIP44V2Key(from: sharedSecret)
         
-        // Derived shared secret
+        // 24-byte random nonce for XChaCha20-Poly1305
+        var nonce24 = Data(count: 24)
+        _ = nonce24.withUnsafeMutableBytes { ptr in
+            SecRandomCopyBytes(kSecRandomDefault, 24, ptr.baseAddress!)
+        }
         
-        // Generate nonce
-        let nonce = AES.GCM.Nonce()
+        let pt = Data(plaintext.utf8)
+        let sealed = try XChaCha20Poly1305Compat.seal(plaintext: pt, key: key, nonce24: nonce24)
         
-        // Encrypt
-        let sealed = try AES.GCM.seal(
-            plaintext.data(using: .utf8)!,
-            using: SymmetricKey(data: sharedSecret),
-            nonce: nonce
-        )
-        
-        // Combine nonce + ciphertext + tag
-        var result = Data()
-        result.append(nonce.withUnsafeBytes { Data($0) })
-        result.append(sealed.ciphertext)
-        result.append(sealed.tag)
-        
-        return result.base64EncodedString()
+        // v2: base64url(nonce24 || ciphertext || tag)
+        var combined = Data()
+        combined.append(nonce24)
+        combined.append(sealed.ciphertext)
+        combined.append(sealed.tag)
+        return "v2:" + base64URLEncode(combined)
     }
     
     private static func decrypt(
@@ -248,86 +292,45 @@ struct NostrProtocol {
         senderPubkey: String,
         recipientKey: P256K.Schnorr.PrivateKey
     ) throws -> String {
-        
-        // Decrypting message
-        
-        guard let data = Data(base64Encoded: ciphertext),
+        // Expect NIP-44 v2 format
+        guard ciphertext.hasPrefix("v2:") else { throw NostrError.invalidCiphertext }
+        let encoded = String(ciphertext.dropFirst(3))
+        guard let data = base64URLDecode(encoded),
+              data.count > (24 + 16),
               let senderPubkeyData = Data(hexString: senderPubkey) else {
-            SecureLogger.log("❌ Invalid ciphertext or sender pubkey format", 
-                            category: SecureLogger.session, level: .error)
             throw NostrError.invalidCiphertext
         }
-        
-        // Ciphertext data parsed
-        
-        // Extract components
-        let nonceData = data.prefix(12)
-        let ciphertextData = data.dropFirst(12).dropLast(16)
-        let tagData = data.suffix(16)
-        
-        // Components parsed
-        
-        // Derive shared secret - try with default Y coordinate first
-        var sharedSecret: Data
-        var decrypted: Data? = nil
-        
-        do {
-            sharedSecret = try deriveSharedSecret(
-                privateKey: recipientKey,
-                publicKey: senderPubkeyData
+
+        let nonce24 = data.prefix(24)
+        let rest = data.dropFirst(24)
+        let tag = rest.suffix(16)
+        let ct = rest.dropLast(16)
+
+        // Try decryption with even-Y then odd-Y when sender pubkey is x-only
+        func attemptDecrypt(using pubKeyData: Data) throws -> Data {
+            let ss = try deriveSharedSecret(privateKey: recipientKey, publicKey: pubKeyData)
+            let key = try deriveNIP44V2Key(from: ss)
+            return try XChaCha20Poly1305Compat.open(
+                ciphertext: Data(ct),
+                tag: Data(tag),
+                key: key,
+                nonce24: Data(nonce24)
             )
-            // Derived shared secret with first Y coordinate
-            
-            // Try to decrypt
-            let sealedBox = try AES.GCM.SealedBox(
-                nonce: AES.GCM.Nonce(data: nonceData),
-                ciphertext: ciphertextData,
-                tag: tagData
-            )
-            
-            do {
-                decrypted = try AES.GCM.open(
-                    sealedBox,
-                    using: SymmetricKey(data: sharedSecret)
-                )
-                // AES-GCM decryption successful
-            } catch {
-                // AES-GCM decryption failed, trying alternate
-                
-                // If the sender pubkey is x-only (32 bytes), try the other Y coordinate
-                if senderPubkeyData.count == 32 {
-                    // Trying alternate Y coordinate
-                    
-                    // Force deriveSharedSecret to use odd Y by manipulating the data
-                    var altPubkey = Data()
-                    altPubkey.append(0x03) // Force odd Y
-                    altPubkey.append(senderPubkeyData)
-                    
-                    sharedSecret = try deriveSharedSecretDirect(
-                        privateKey: recipientKey,
-                        publicKey: altPubkey
-                    )
-                    
-                    decrypted = try AES.GCM.open(
-                        sealedBox,
-                        using: SymmetricKey(data: sharedSecret)
-                    )
-                    // AES-GCM decryption successful with alternate Y
-                } else {
-                    throw error
-                }
+        }
+
+        // If 32 bytes (x-only) try both parities, otherwise single try
+        if senderPubkeyData.count == 32 {
+            let even = Data([0x02]) + senderPubkeyData
+            if let pt = try? attemptDecrypt(using: even) {
+                return String(data: pt, encoding: .utf8) ?? ""
             }
-        } catch {
-            SecureLogger.log("❌ Failed to derive shared secret or decrypt: \(error)", 
-                            category: SecureLogger.session, level: .error)
-            throw error
+            let odd = Data([0x03]) + senderPubkeyData
+            let pt = try attemptDecrypt(using: odd)
+            return String(data: pt, encoding: .utf8) ?? ""
+        } else {
+            let pt = try attemptDecrypt(using: senderPubkeyData)
+            return String(data: pt, encoding: .utf8) ?? ""
         }
-        
-        guard let finalDecrypted = decrypted else {
-            throw NostrError.encryptionFailed
-        }
-        
-        return String(data: finalDecrypted, encoding: .utf8) ?? ""
     }
     
     private static func deriveSharedSecret(
@@ -387,17 +390,8 @@ struct NostrProtocol {
         let sharedSecretData = sharedSecret.withUnsafeBytes { Data($0) }
         // ECDH shared secret derived
         
-        // Derive key using HKDF for NIP-44 v2
-        let derivedKey = HKDF<CryptoKit.SHA256>.deriveKey(
-            inputKeyMaterial: SymmetricKey(data: sharedSecretData),
-            salt: "nip44-v2".data(using: .utf8)!,
-            info: Data(),
-            outputByteCount: 32
-        )
-        
-        let result = derivedKey.withUnsafeBytes { Data($0) }
-        // Final derived key ready
-        return result
+        // Return raw ECDH shared secret; HKDF is applied by deriveNIP44V2Key
+        return sharedSecretData
     }
     
     // Direct version that doesn't try to add prefixes
@@ -427,34 +421,25 @@ struct NostrProtocol {
         // Convert SharedSecret to Data
         let sharedSecretData = sharedSecret.withUnsafeBytes { Data($0) }
         
-        // Derive key using HKDF for NIP-44 v2
-        let derivedKey = HKDF<CryptoKit.SHA256>.deriveKey(
-            inputKeyMaterial: SymmetricKey(data: sharedSecretData),
-            salt: "nip44-v2".data(using: .utf8)!,
-            info: Data(),
-            outputByteCount: 32
-        )
-        
-        return derivedKey.withUnsafeBytes { Data($0) }
+        // Return raw ECDH shared secret; HKDF is applied by deriveNIP44V2Key
+        return sharedSecretData
     }
     
     private static func randomizedTimestamp() -> Date {
         // Add random offset to current time for privacy
-        // TEMPORARY: Reduced range to debug timestamp issue
-        let offset = TimeInterval.random(in: -60...60) // +/- 1 minute (was +/- 15 minutes)
+        // This prevents timing correlation attacks while the actual message timestamp
+        // is preserved in the encrypted rumor
+        let offset = TimeInterval.random(in: -900...900) // +/- 15 minutes
         let now = Date()
         let randomized = now.addingTimeInterval(offset)
         
         // Log with explicit UTC and local time for debugging
         let formatter = DateFormatter()
+        //
         formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
         formatter.timeZone = TimeZone(abbreviation: "UTC")
-        let _ = formatter.string(from: now)
-        let _ = formatter.string(from: randomized)
         
         formatter.timeZone = TimeZone.current
-        let _ = formatter.string(from: now)
-        let _ = formatter.string(from: randomized)
         
         // Timestamp randomized for privacy
         
@@ -506,16 +491,16 @@ struct NostrEvent: Codable {
         self.sig = dict["sig"] as? String
     }
     
-    func sign(with key: P256K.Signing.PrivateKey) throws -> NostrEvent {
+    func sign(with key: P256K.Schnorr.PrivateKey) throws -> NostrEvent {
         let (eventId, eventIdHash) = try calculateEventId()
         
-        // Convert to Schnorr key for Nostr signing
-        let schnorrKey = try P256K.Schnorr.PrivateKey(dataRepresentation: key.dataRepresentation)
-        
-        // Sign with Schnorr
+        // Sign with Schnorr (BIP-340)
         var messageBytes = [UInt8](eventIdHash)
-        var auxRand = [UInt8](repeating: 0, count: 32) // Zero auxiliary randomness for deterministic signing
-        let schnorrSignature = try schnorrKey.signature(message: &messageBytes, auxiliaryRand: &auxRand)
+        var auxRand = [UInt8](repeating: 0, count: 32)
+        _ = auxRand.withUnsafeMutableBytes { ptr in
+            SecRandomCopyBytes(kSecRandomDefault, 32, ptr.baseAddress!)
+        }
+        let schnorrSignature = try key.signature(message: &messageBytes, auxiliaryRand: &auxRand)
         
         let signatureHex = schnorrSignature.dataRepresentation.hexEncodedString()
         
@@ -536,10 +521,7 @@ struct NostrEvent: Codable {
         ] as [Any]
         
         let data = try JSONSerialization.data(withJSONObject: serialized, options: [.withoutEscapingSlashes])
-        let hash = CryptoKit.SHA256.hash(data: data)
-        let hashData = Data(hash)
-        let hashHex = hash.compactMap { String(format: "%02x", $0) }.joined()
-        return (hashHex, hashData)
+        return (data.sha256Fingerprint(), data.sha256Hash())
     }
     
     func jsonString() throws -> String {
@@ -557,4 +539,33 @@ enum NostrError: Error {
     case invalidCiphertext
     case signingFailed
     case encryptionFailed
-}
+}
+
+// MARK: - NIP-44 v2 helpers (XChaCha20-Poly1305 + base64url)
+
+private extension NostrProtocol {
+    static func base64URLEncode(_ data: Data) -> String {
+        return data.base64EncodedString()
+            .replacingOccurrences(of: "+", with: "-")
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "=", with: "")
+    }
+
+    static func base64URLDecode(_ s: String) -> Data? {
+        var str = s
+        let pad = (4 - (str.count % 4)) % 4
+        if pad > 0 { str += String(repeating: "=", count: pad) }
+        str = str.replacingOccurrences(of: "-", with: "+").replacingOccurrences(of: "_", with: "/")
+        return Data(base64Encoded: str)
+    }
+
+    static func deriveNIP44V2Key(from sharedSecretData: Data) throws -> Data {
+        let derivedKey = HKDF<CryptoKit.SHA256>.deriveKey(
+            inputKeyMaterial: SymmetricKey(data: sharedSecretData),
+            salt: Data(),
+            info: "nip44-v2".data(using: .utf8)!,
+            outputByteCount: 32
+        )
+        return derivedKey.withUnsafeBytes { Data($0) }
+    }
+}

bitchat/Nostr/NostrRelayManager.swift

@@ -1,11 +1,18 @@
+import BitLogger
 import Foundation
 import Network
 import Combine
+import Tor
 
 /// Manages WebSocket connections to Nostr relays
 @MainActor
-class NostrRelayManager: ObservableObject {
+final class NostrRelayManager: ObservableObject {
     static let shared = NostrRelayManager()
+    // Track gift-wraps (kind 1059) we initiated so we can log OK acks at info
+    private(set) static var pendingGiftWrapIDs = Set<String>()
+    static func registerPendingGiftWrap(id: String) {
+        pendingGiftWrapIDs.insert(id)
+    }
     
     struct Relay: Identifiable {
         let id = UUID()
@@ -23,127 +30,372 @@ class NostrRelayManager: ObservableObject {
     // Default relay list (can be customized)
     private static let defaultRelays = [
         "wss://relay.damus.io",
+        "wss://nos.lol",
         "wss://relay.primal.net",
         "wss://offchain.pub",
         "wss://nostr21.com"
         // For local testing, you can add: "ws://localhost:8080"
     ]
+    private static let defaultRelaySet = Set(defaultRelays)
     
     @Published private(set) var relays: [Relay] = []
     @Published private(set) var isConnected = false
     
+    private var allowDefaultRelays: Bool = false
+    private var hasMutualFavorites: Bool = false
+    private var hasLocationPermission: Bool = false
     private var connections: [String: URLSessionWebSocketTask] = [:]
-    private var subscriptions: [String: Set<String>] = [:] // relay URL -> subscription IDs
+    private var subscriptions: [String: Set<String>] = [:] // relay URL -> active subscription IDs
+    private var pendingSubscriptions: [String: [String: String]] = [:] // relay URL -> (subscription id -> encoded REQ JSON)
     private var messageHandlers: [String: (NostrEvent) -> Void] = [:]
+    // Coalesce duplicate subscribe requests for the same id within a short window
+    private var subscribeCoalesce: [String: Date] = [:]
     private var cancellables = Set<AnyCancellable>()
+
+    // Track EOSE per subscription to signal when initial stored events are done
+    private struct EOSETracker {
+        var pendingRelays: Set<String>
+        var callback: () -> Void
+        var timer: Timer?
+    }
+    private var eoseTrackers: [String: EOSETracker] = [:]
     
     // Message queue for reliability
-    private var messageQueue: [(event: NostrEvent, relayUrls: [String])] = []
+    // Pending sends held only for relays that are not yet connected.
+    private struct PendingSend {
+        var event: NostrEvent
+        var pendingRelays: Set<String>
+    }
+    private var messageQueue: [PendingSend] = []
     private let messageQueueLock = NSLock()
+    private let encoder = JSONEncoder()
+    private let decoder = JSONDecoder()
+    private var networkService: NetworkActivationService { NetworkActivationService.shared }
+    private var shouldUseTor: Bool { networkService.userTorEnabled }
     
     // Exponential backoff configuration
-    private let initialBackoffInterval: TimeInterval = 1.0  // Start with 1 second
-    private let maxBackoffInterval: TimeInterval = 300.0    // Max 5 minutes
-    private let backoffMultiplier: Double = 2.0            // Double each time
-    private let maxReconnectAttempts = 10                  // Stop after 10 attempts
+    private let initialBackoffInterval: TimeInterval = TransportConfig.nostrRelayInitialBackoffSeconds
+    private let maxBackoffInterval: TimeInterval = TransportConfig.nostrRelayMaxBackoffSeconds
+    private let backoffMultiplier: Double = TransportConfig.nostrRelayBackoffMultiplier
+    private let maxReconnectAttempts = TransportConfig.nostrRelayMaxReconnectAttempts
     
     // Reconnection timer
     private var reconnectionTimer: Timer?
+    // Bump generation to invalidate scheduled reconnects when we reset/disconnect
+    private var connectionGeneration: Int = 0
     
     init() {
-        // Initialize with default relays
-        self.relays = Self.defaultRelays.map { Relay(url: $0) }
+        hasMutualFavorites = !FavoritesPersistenceService.shared.mutualFavorites.isEmpty
+        hasLocationPermission = LocationChannelManager.shared.permissionState == .authorized
+        applyDefaultRelayPolicy(force: true)
+        // Deterministic JSON shape for outbound requests
+        self.encoder.outputFormatting = .sortedKeys
+        FavoritesPersistenceService.shared.$mutualFavorites
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] favorites in
+                guard let self = self else { return }
+                self.hasMutualFavorites = !favorites.isEmpty
+                self.applyDefaultRelayPolicy()
+            }
+            .store(in: &cancellables)
+        LocationChannelManager.shared.$permissionState
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] state in
+                guard let self = self else { return }
+                let authorized = (state == .authorized)
+                if authorized == self.hasLocationPermission { return }
+                self.hasLocationPermission = authorized
+                self.applyDefaultRelayPolicy()
+            }
+            .store(in: &cancellables)
     }
     
     /// Connect to all configured relays
     func connect() {
-        for relay in relays {
-            connectToRelay(relay.url)
+        // Global network policy gate
+        guard networkService.activationAllowed else { return }
+        if shouldUseTor {
+            // Ensure Tor is started early and wait for readiness off-main; then hop back to connect.
+            Task.detached {
+                let ready = await TorManager.shared.awaitReady()
+                await MainActor.run {
+                    if !ready {
+                        SecureLogger.error("❌ Tor not ready; aborting relay connections (fail-closed)", category: .session)
+                        return
+                    }
+                    SecureLogger.debug("🌐 Connecting to \(self.relays.count) Nostr relays (via Tor)", category: .session)
+                    for relay in self.relays {
+                        self.connectToRelay(relay.url)
+                    }
+                }
+            }
+        } else {
+            SecureLogger.debug("🌐 Connecting to \(self.relays.count) Nostr relays (direct)", category: .session)
+            for relay in self.relays {
+                connectToRelay(relay.url)
+            }
         }
     }
     
     /// Disconnect from all relays
     func disconnect() {
+        connectionGeneration &+= 1
         for (_, task) in connections {
             task.cancel(with: .goingAway, reason: nil)
         }
         connections.removeAll()
+        // Clear known subscriptions and any queued subs since connections are gone
+        subscriptions.removeAll()
+        pendingSubscriptions.removeAll()
         updateConnectionStatus()
     }
     
+    /// Ensure connections exist to the given relay URLs (idempotent).
+    func ensureConnections(to relayUrls: [String]) {
+        // Global network policy gate
+        guard networkService.activationAllowed else { return }
+        let targets = allowedRelayList(from: relayUrls)
+        guard !targets.isEmpty else { return }
+        if shouldUseTor && TorManager.shared.torEnforced && !TorManager.shared.isReady {
+            // Defer until Tor is fully ready; avoid queuing connection attempts early
+            Task.detached { [weak self] in
+                guard let self = self else { return }
+                let ready = await TorManager.shared.awaitReady()
+                await MainActor.run { if ready { self.ensureConnections(to: relayUrls) } }
+            }
+            return
+        }
+        var existing = Set(relays.map { $0.url })
+        for url in targets where !existing.contains(url) {
+            relays.append(Relay(url: url))
+            existing.insert(url)
+        }
+        for url in targets where connections[url] == nil {
+            connectToRelay(url)
+        }
+    }
+
     /// Send an event to specified relays (or all if none specified)
     func sendEvent(_ event: NostrEvent, to relayUrls: [String]? = nil) {
-        let targetRelays = relayUrls ?? relays.map { $0.url }
-        
-        // Add to queue for reliability
-        messageQueueLock.lock()
-        messageQueue.append((event, targetRelays))
-        messageQueueLock.unlock()
-        
-        // Attempt immediate send
+        // Global network policy gate
+        guard networkService.activationAllowed else { return }
+        if shouldUseTor && TorManager.shared.torEnforced && !TorManager.shared.isReady {
+            // Defer sends until Tor is ready to avoid premature queueing
+            Task.detached { [weak self] in
+                guard let self = self else { return }
+                let ready = await TorManager.shared.awaitReady()
+                await MainActor.run { if ready { self.sendEvent(event, to: relayUrls) } }
+            }
+            return
+        }
+        let requestedRelays = relayUrls ?? Self.defaultRelays
+        let targetRelays = allowedRelayList(from: requestedRelays)
+        guard !targetRelays.isEmpty else { return }
+        ensureConnections(to: targetRelays)
+
+        // Attempt immediate send to relays with active connections; queue the rest
+        var stillPending = Set<String>()
         for relayUrl in targetRelays {
             if let connection = connections[relayUrl] {
                 sendToRelay(event: event, connection: connection, relayUrl: relayUrl)
+            } else {
+                stillPending.insert(relayUrl)
+            }
+        }
+        if !stillPending.isEmpty {
+            messageQueueLock.lock()
+            messageQueue.append(PendingSend(event: event, pendingRelays: stillPending))
+            messageQueueLock.unlock()
+        }
+    }
+
+    /// Try to flush any queued messages for relays that are now connected.
+    private func flushMessageQueue(for relayUrl: String? = nil) {
+        messageQueueLock.lock()
+        defer { messageQueueLock.unlock() }
+        guard !messageQueue.isEmpty else { return }
+        if let target = relayUrl {
+            // Flush only for a specific relay
+            for i in (0..<messageQueue.count).reversed() {
+                var item = messageQueue[i]
+                if item.pendingRelays.contains(target), let conn = connections[target] {
+                    sendToRelay(event: item.event, connection: conn, relayUrl: target)
+                    item.pendingRelays.remove(target)
+                    if item.pendingRelays.isEmpty {
+                        messageQueue.remove(at: i)
+                    } else {
+                        messageQueue[i] = item
+                    }
+                }
+            }
+        } else {
+            // Flush for any relays that now have connections
+            for i in (0..<messageQueue.count).reversed() {
+                var item = messageQueue[i]
+                for url in item.pendingRelays {
+                    if let conn = connections[url] {
+                        sendToRelay(event: item.event, connection: conn, relayUrl: url)
+                        item.pendingRelays.remove(url)
+                    }
+                }
+                if item.pendingRelays.isEmpty {
+                    messageQueue.remove(at: i)
+                } else {
+                    messageQueue[i] = item
+                }
             }
         }
     }
     
-    /// Subscribe to events matching a filter
+    /// Subscribe to events matching a filter. If `relayUrls` provided, targets only those relays.
     func subscribe(
         filter: NostrFilter,
         id: String = UUID().uuidString,
-        handler: @escaping (NostrEvent) -> Void
+        relayUrls: [String]? = nil,
+        handler: @escaping (NostrEvent) -> Void,
+        onEOSE: (() -> Void)? = nil
     ) {
+        // Global network policy gate
+        guard networkService.activationAllowed else { return }
+        // Coalesce rapid duplicate subscribe requests only if a handler already exists
+        let now = Date()
+        if messageHandlers[id] != nil {
+            if let last = subscribeCoalesce[id], now.timeIntervalSince(last) < 1.0 {
+                return
+            }
+        }
+        subscribeCoalesce[id] = now
+        if shouldUseTor && TorManager.shared.torEnforced && !TorManager.shared.isReady {
+            // Defer subscription setup until Tor is ready; avoid queuing subs early
+            Task.detached { [weak self] in
+                guard let self = self else { return }
+                let ready = await TorManager.shared.awaitReady()
+                await MainActor.run {
+                    if ready {
+                        self.subscribe(filter: filter, id: id, relayUrls: relayUrls, handler: handler)
+                    }
+                }
+            }
+            return
+        }
         messageHandlers[id] = handler
         
         let req = NostrRequest.subscribe(id: id, filters: [filter])
         
         do {
-            let encoder = JSONEncoder()
-            encoder.outputFormatting = .sortedKeys // For consistent output
             let message = try encoder.encode(req)
             guard let messageString = String(data: message, encoding: .utf8) else { 
-                SecureLogger.log("❌ Failed to encode subscription request", category: SecureLogger.session, level: .error)
+                SecureLogger.error("❌ Failed to encode subscription request", category: .session)
                 return 
             }
             
-            // Sending subscription to relays
-            // Filter JSON prepared
-            // Full filter JSON logged
+            // SecureLogger.debug("📋 Subscription filter JSON: \(messageString.prefix(200))...", category: .session)
             
-            // Send subscription to all connected relays
-            for (relayUrl, connection) in connections {
-                connection.send(.string(messageString)) { error in
-                    if let error = error {
-                        SecureLogger.log("❌ Failed to send subscription to \(relayUrl): \(error)", 
-                                        category: SecureLogger.session, level: .error)
-                    } else {
-                        // Subscription sent successfully
+            // Target specific relays if provided; else default. Filter permanently failed relays.
+            let baseUrls = relayUrls ?? Self.defaultRelays
+            let candidateUrls = baseUrls.filter { !isPermanentlyFailed($0) }
+            let urls = allowedRelayList(from: candidateUrls)
+            // Always queue subscriptions; sending happens when a relay reports connected
+            let existingSet = Set(relays.map { $0.url })
+            for url in urls where !existingSet.contains(url) {
+                relays.append(Relay(url: url))
+            }
+            for url in candidateUrls {
+                var map = self.pendingSubscriptions[url] ?? [:]
+                map[id] = messageString
+                self.pendingSubscriptions[url] = map
+            }
+            // Initialize EOSE tracking if requested
+            if let onEOSE = onEOSE {
+                if urls.isEmpty {
+                    onEOSE()
+                } else {
+                    var tracker = EOSETracker(pendingRelays: Set(urls), callback: onEOSE, timer: nil)
+                    // Fallback timeout to avoid hanging if a relay never sends EOSE
+                    tracker.timer = Timer.scheduledTimer(withTimeInterval: 2.0, repeats: false) { [weak self] _ in
                         Task { @MainActor in
-                            var subs = self.subscriptions[relayUrl] ?? Set<String>()
-                            subs.insert(id)
-                            self.subscriptions[relayUrl] = subs
+                            guard let self = self else { return }
+                            if let t = self.eoseTrackers[id] {
+                                t.timer?.invalidate()
+                                self.eoseTrackers.removeValue(forKey: id)
+                                onEOSE()
+                            }
                         }
                     }
+                    eoseTrackers[id] = tracker
                 }
             }
-            
-            if connections.isEmpty {
-                SecureLogger.log("⚠️ No relay connections available for subscription", 
-                                category: SecureLogger.session, level: .warning)
+            SecureLogger.debug("📋 Queued subscription id=\(id) for \(urls.count) relay(s)", category: .session)
+            // Ensure we actually have sockets opening to these relays so queued REQs can flush
+            ensureConnections(to: urls)
+            // If some targets are already connected, flush immediately for them
+            for url in urls {
+                if let r = relays.first(where: { $0.url == url }), r.isConnected {
+                    flushPendingSubscriptions(for: url)
+                }
             }
         } catch {
-            SecureLogger.log("❌ Failed to encode subscription request: \(error)", 
-                            category: SecureLogger.session, level: .error)
+            SecureLogger.error("❌ Failed to encode subscription request: \(error)", category: .session)
         }
     }
+
+    private func applyDefaultRelayPolicy(force: Bool = false) {
+        let shouldAllow = hasMutualFavorites || hasLocationPermission
+        if !force && shouldAllow == allowDefaultRelays { return }
+        allowDefaultRelays = shouldAllow
+        if shouldAllow {
+            var existing = Set(relays.map { $0.url })
+            for url in Self.defaultRelays where !existing.contains(url) {
+                relays.append(Relay(url: url))
+                existing.insert(url)
+            }
+            if networkService.activationAllowed {
+                ensureConnections(to: Self.defaultRelays)
+            }
+        } else {
+            for url in Self.defaultRelays {
+                if let connection = connections[url] {
+                    connection.cancel(with: .goingAway, reason: nil)
+                }
+                connections.removeValue(forKey: url)
+                subscriptions.removeValue(forKey: url)
+            }
+            messageQueueLock.lock()
+            for index in (0..<messageQueue.count).reversed() {
+                var item = messageQueue[index]
+                item.pendingRelays.subtract(Self.defaultRelaySet)
+                if item.pendingRelays.isEmpty {
+                    messageQueue.remove(at: index)
+                } else {
+                    messageQueue[index] = item
+                }
+            }
+            messageQueueLock.unlock()
+            relays.removeAll { Self.defaultRelaySet.contains($0.url) }
+            updateConnectionStatus()
+        }
+    }
+
+    private func allowedRelayList(from urls: [String]) -> [String] {
+        var seen = Set<String>()
+        var result: [String] = []
+        for url in urls {
+            if !allowDefaultRelays && Self.defaultRelaySet.contains(url) { continue }
+            if seen.insert(url).inserted {
+                result.append(url)
+            }
+        }
+        return result
+    }
     
     /// Unsubscribe from a subscription
     func unsubscribe(id: String) {
         messageHandlers.removeValue(forKey: id)
+        // Allow immediate re-subscription by clearing coalescer timestamp
+        subscribeCoalesce.removeValue(forKey: id)
         
         let req = NostrRequest.close(id: id)
-        let message = try? JSONEncoder().encode(req)
+        let message = try? encoder.encode(req)
         
         guard let messageData = message,
               let messageString = String(data: messageData, encoding: .utf8) else { return }
@@ -163,14 +415,42 @@ class NostrRelayManager: ObservableObject {
     // MARK: - Private Methods
     
     private func connectToRelay(_ urlString: String) {
+        // Global network policy gate
+        guard networkService.activationAllowed else { return }
         guard let url = URL(string: urlString) else { 
-            SecureLogger.log("Invalid relay URL: \(urlString)", category: SecureLogger.session, level: .warning)
+            SecureLogger.warning("Invalid relay URL: \(urlString)", category: .session)
             return 
         }
+
+        // Avoid initiating connections while app is backgrounded; we'll reconnect on foreground
+        if shouldUseTor && TorManager.shared.torEnforced && !TorManager.shared.isForeground() {
+            return
+        }
         
-        // Attempting to connect to Nostr relay
+        // Skip if we already have a connection object
+        if connections[urlString] != nil {
+            return
+        }
+        if isPermanentlyFailed(urlString) {
+            return
+        }
         
-        let session = URLSession(configuration: .default)
+        // Attempting to connect to Nostr relay via the proxied session
+        
+        // If Tor is enforced but not ready, delay connection until it is.
+        if shouldUseTor && TorManager.shared.torEnforced && !TorManager.shared.isReady {
+            Task.detached { [weak self] in
+                guard let self = self else { return }
+                let ready = await TorManager.shared.awaitReady()
+                await MainActor.run {
+                    if ready { self.connectToRelay(urlString) }
+                    else { SecureLogger.error("❌ Tor not ready; skipping connection to \(urlString)", category: .session) }
+                }
+            }
+            return
+        }
+        
+        let session = TorURLSession.shared.session
         let task = session.webSocketTask(with: url)
         
         connections[urlString] = task
@@ -183,13 +463,12 @@ class NostrRelayManager: ObservableObject {
         task.sendPing { [weak self] error in
             DispatchQueue.main.async {
                 if error == nil {
-                    // Successfully connected to Nostr relay
+                    SecureLogger.debug("✅ Connected to Nostr relay: \(urlString)", category: .session)
                     self?.updateRelayStatus(urlString, isConnected: true)
-                    SecureLogger.log("Successfully connected to Nostr relay \(urlString)", 
-                                   category: SecureLogger.session, level: .info)
+                    // Flush any pending subscriptions for this relay
+                    self?.flushPendingSubscriptions(for: urlString)
                 } else {
-                    SecureLogger.log("Failed to connect to Nostr relay \(urlString): \(error?.localizedDescription ?? "Unknown error")", 
-                                   category: SecureLogger.session, level: .error)
+                    SecureLogger.error("❌ Failed to connect to Nostr relay \(urlString): \(error?.localizedDescription ?? "Unknown error")", category: .session)
                     self?.updateRelayStatus(urlString, isConnected: false, error: error)
                     // Trigger disconnection handler for proper backoff
                     self?.handleDisconnection(relayUrl: urlString, error: error ?? NSError(domain: "NostrRelay", code: -1, userInfo: nil))
@@ -197,6 +476,27 @@ class NostrRelayManager: ObservableObject {
             }
         }
     }
+
+    /// Send any queued subscriptions for a relay that just connected.
+    private func flushPendingSubscriptions(for relayUrl: String) {
+        guard let map = pendingSubscriptions[relayUrl], !map.isEmpty else { return }
+        guard let connection = connections[relayUrl] else { return }
+        for (id, messageString) in map {
+            if self.subscriptions[relayUrl]?.contains(id) == true { continue }
+            connection.send(.string(messageString)) { error in
+                if let error = error {
+                    SecureLogger.error("❌ Failed to send pending subscription to \(relayUrl): \(error)", category: .session)
+                } else {
+                    Task { @MainActor in
+                        var subs = self.subscriptions[relayUrl] ?? Set<String>()
+                        subs.insert(id)
+                        self.subscriptions[relayUrl] = subs
+                    }
+                }
+            }
+        }
+        pendingSubscriptions[relayUrl] = nil
+    }
     
     private func receiveMessage(from task: URLSessionWebSocketTask, relayUrl: String) {
         task.receive { [weak self] result in
@@ -204,19 +504,12 @@ class NostrRelayManager: ObservableObject {
             
             switch result {
             case .success(let message):
-                switch message {
-                case .string(let text):
-                    Task { @MainActor in
-                        self.handleMessage(text, from: relayUrl)
+                // Parse off-main to reduce UI jank, then hop back for state updates
+                Task.detached(priority: .utility) {
+                    guard let parsed = ParsedInbound(message) else { return }
+                    await MainActor.run {
+                        NostrRelayManager.shared.handleParsedMessage(parsed, from: relayUrl)
                     }
-                case .data(let data):
-                    if let text = String(data: data, encoding: .utf8) {
-                        Task { @MainActor in
-                        self.handleMessage(text, from: relayUrl)
-                    }
-                    }
-                @unknown default:
-                    break
                 }
                 
                 // Continue receiving
@@ -232,73 +525,50 @@ class NostrRelayManager: ObservableObject {
         }
     }
     
-    private func handleMessage(_ message: String, from relayUrl: String) {
-        guard let data = message.data(using: .utf8) else { return }
-        
-        do {
-            // Try to decode as an array first
-            if let array = try JSONSerialization.jsonObject(with: data) as? [Any],
-               array.count >= 2,
-               let type = array[0] as? String {
-                
-                // Received message from relay
-                
-                switch type {
-                case "EVENT":
-                    if array.count >= 3,
-                       let subId = array[1] as? String,
-                       let eventDict = array[2] as? [String: Any] {
-                        
-                        let event = try NostrEvent(from: eventDict)
-                        
-                        // Processing event
-                        
-                        DispatchQueue.main.async {
-                            // Update relay stats
-                            if let index = self.relays.firstIndex(where: { $0.url == relayUrl }) {
-                                self.relays[index].messagesReceived += 1
-                            }
-                            
-                            // Call handler
-                            if let handler = self.messageHandlers[subId] {
-                                handler(event)
-                            } else {
-                                SecureLogger.log("⚠️ No handler for subscription \(subId)", 
-                                                category: SecureLogger.session, level: .warning)
-                            }
-                        }
-                    }
-                    
-                case "EOSE":
-                    if array.count >= 2,
-                       let _ = array[1] as? String {
-                        // End of stored events
-                    }
-                    
-                case "OK":
-                    if array.count >= 3,
-                       let eventId = array[1] as? String,
-                       let success = array[2] as? Bool {
-                        let reason = array.count >= 4 ? (array[3] as? String ?? "no reason given") : "no reason given"
-                        if !success {
-                            SecureLogger.log("📮 Event \(eventId) rejected by relay: \(reason)", 
-                                            category: SecureLogger.session, level: .error)
-                        }
-                    }
-                    
-                case "NOTICE":
-                    if array.count >= 2,
-                       let notice = array[1] as? String {
-                        SecureLogger.log("📢 Relay notice: \(notice)", 
-                                        category: SecureLogger.session, level: .info)
-                    }
-                    
-                default:
-                    break // Unknown message type
+    // Parsed inbound message type (off-main)
+    // Note: declared at file scope below to avoid MainActor isolation inside this class
+    // and keep parsing off the main actor.
+
+    // Handle parsed message on MainActor (state updates and handlers)
+    private func handleParsedMessage(_ parsed: ParsedInbound, from relayUrl: String) {
+        switch parsed {
+        case .event(let subId, let event):
+            if event.kind != 1059 {
+                SecureLogger.debug("📥 Event kind=\(event.kind) id=\(event.id.prefix(16))… relay=\(relayUrl)", category: .session)
+            }
+            if let index = self.relays.firstIndex(where: { $0.url == relayUrl }) {
+                self.relays[index].messagesReceived += 1
+            }
+            if let handler = self.messageHandlers[subId] {
+                handler(event)
+            } else {
+                SecureLogger.warning("⚠️ No handler for subscription \(subId)", category: .session)
+            }
+        case .eose(let subId):
+            if var tracker = eoseTrackers[subId] {
+                tracker.pendingRelays.remove(relayUrl)
+                if tracker.pendingRelays.isEmpty {
+                    tracker.timer?.invalidate()
+                    eoseTrackers.removeValue(forKey: subId)
+                    tracker.callback()
+                } else {
+                    eoseTrackers[subId] = tracker
                 }
             }
-        } catch {
-            SecureLogger.log("Failed to parse Nostr message: \(error)", category: SecureLogger.session, level: .error)
+        case .ok(let eventId, let success, let reason):
+            if success {
+                _ = Self.pendingGiftWrapIDs.remove(eventId)
+                SecureLogger.debug("✅ Accepted id=\(eventId.prefix(16))… relay=\(relayUrl)", category: .session)
+            } else {
+                let isGiftWrap = Self.pendingGiftWrapIDs.remove(eventId) != nil
+                if isGiftWrap {
+                    SecureLogger.warning("📮 Rejected id=\(eventId.prefix(16))… reason=\(reason)", category: .session)
+                } else {
+                    SecureLogger.error("📮 Rejected id=\(eventId.prefix(16))… reason=\(reason)", category: .session)
+                }
+            }
+        case .notice:
+            break
         }
     }
     
@@ -306,20 +576,17 @@ class NostrRelayManager: ObservableObject {
         let req = NostrRequest.event(event)
         
         do {
-            let encoder = JSONEncoder()
-            encoder.outputFormatting = .sortedKeys
             let data = try encoder.encode(req)
             let message = String(data: data, encoding: .utf8) ?? ""
             
-            // Sending event to relay
-            // Event JSON prepared
+            SecureLogger.debug("📤 Send kind=\(event.kind) id=\(event.id.prefix(16))… relay=\(relayUrl)", category: .session)
             
             connection.send(.string(message)) { [weak self] error in
                 DispatchQueue.main.async {
                     if let error = error {
-                        SecureLogger.log("❌ Failed to send event to \(relayUrl): \(error)", 
-                                        category: SecureLogger.session, level: .error)
+                        SecureLogger.error("❌ Failed to send event to \(relayUrl): \(error)", category: .session)
                     } else {
+                        // SecureLogger.debug("✅ Event sent to relay: \(relayUrl)", category: .session)
                         // Update relay stats
                         if let index = self?.relays.firstIndex(where: { $0.url == relayUrl }) {
                             self?.relays[index].messagesSent += 1
@@ -328,7 +595,7 @@ class NostrRelayManager: ObservableObject {
                 }
             }
         } catch {
-            SecureLogger.log("Failed to encode event: \(error)", category: SecureLogger.session, level: .error)
+            SecureLogger.error("Failed to encode event: \(error)", category: .session)
         }
     }
     
@@ -345,6 +612,10 @@ class NostrRelayManager: ObservableObject {
             }
         }
         updateConnectionStatus()
+        // If we just connected to this relay, flush any queued sends targeting it
+        if isConnected {
+            flushMessageQueue(for: url)
+        }
     }
     
     private func updateConnectionStatus() {
@@ -352,22 +623,32 @@ class NostrRelayManager: ObservableObject {
     }
     
     private func handleDisconnection(relayUrl: String, error: Error) {
+        // If networking is disallowed, do not schedule reconnection
+        if !networkService.activationAllowed {
+            connections.removeValue(forKey: relayUrl)
+            subscriptions.removeValue(forKey: relayUrl)
+            updateRelayStatus(relayUrl, isConnected: false, error: error)
+            return
+        }
         connections.removeValue(forKey: relayUrl)
         subscriptions.removeValue(forKey: relayUrl)
         updateRelayStatus(relayUrl, isConnected: false, error: error)
         
-        // Check if this is a DNS error
+        // Check if this is a DNS or handshake error; treat as permanent
         let errorDescription = error.localizedDescription.lowercased()
+        let ns = error as NSError
         if errorDescription.contains("hostname could not be found") || 
-           errorDescription.contains("dns") {
-            // Only log once for DNS failures
+           errorDescription.contains("dns") ||
+           (ns.domain == NSURLErrorDomain && ns.code == NSURLErrorBadServerResponse) {
             if relays.first(where: { $0.url == relayUrl })?.lastError == nil {
-                SecureLogger.log("Nostr relay DNS failure for \(relayUrl) - not retrying", category: SecureLogger.session, level: .warning)
+                SecureLogger.warning("Nostr relay permanent failure for \(relayUrl) - not retrying (code=\(ns.code))", category: .session)
             }
-            // Mark relay as permanently failed
             if let index = relays.firstIndex(where: { $0.url == relayUrl }) {
                 relays[index].lastError = error
+                relays[index].reconnectAttempts = maxReconnectAttempts
+                relays[index].nextReconnectTime = nil
             }
+            pendingSubscriptions[relayUrl] = nil
             return
         }
         
@@ -378,8 +659,7 @@ class NostrRelayManager: ObservableObject {
         
         // Stop attempting after max attempts
         if relays[index].reconnectAttempts >= maxReconnectAttempts {
-            SecureLogger.log("Max reconnection attempts (\(maxReconnectAttempts)) reached for \(relayUrl)", 
-                           category: SecureLogger.session, level: .warning)
+            SecureLogger.warning("Max reconnection attempts (\(maxReconnectAttempts)) reached for \(relayUrl)", category: .session)
             return
         }
         
@@ -392,13 +672,13 @@ class NostrRelayManager: ObservableObject {
         let nextReconnectTime = Date().addingTimeInterval(backoffInterval)
         relays[index].nextReconnectTime = nextReconnectTime
         
-        SecureLogger.log("Scheduling reconnection to \(relayUrl) in \(Int(backoffInterval))s (attempt \(relays[index].reconnectAttempts))", 
-                       category: SecureLogger.session, level: .info)
         
         // Schedule reconnection with exponential backoff
+        let gen = connectionGeneration
         DispatchQueue.main.asyncAfter(deadline: .now() + backoffInterval) { [weak self] in
             guard let self = self else { return }
-            
+            // Ignore stale scheduled reconnects from a previous generation
+            guard gen == self.connectionGeneration else { return }
             // Check if we should still reconnect (relay might have been removed)
             if self.relays.contains(where: { $0.url == relayUrl }) {
                 self.connectToRelay(relayUrl)
@@ -439,6 +719,8 @@ class NostrRelayManager: ObservableObject {
     /// Reset all relay connections
     func resetAllConnections() {
         disconnect()
+        // New generation begins now
+        connectionGeneration &+= 1
         
         // Reset all relay states
         for index in relays.indices {
@@ -450,6 +732,81 @@ class NostrRelayManager: ObservableObject {
         // Reconnect
         connect()
     }
+
+    // MARK: - Failure classification
+    private func isPermanentlyFailed(_ url: String) -> Bool {
+        guard let r = relays.first(where: { $0.url == url }) else { return false }
+        if r.reconnectAttempts >= maxReconnectAttempts { return true }
+        if let ns = r.lastError as NSError?, ns.domain == NSURLErrorDomain {
+            if ns.code == NSURLErrorBadServerResponse || ns.code == NSURLErrorCannotFindHost {
+                return true
+            }
+        }
+        return false
+    }
+}
+
+// MARK: - Off-main inbound parsing helpers (file scope, non-isolated)
+
+private enum ParsedInbound {
+    case event(subId: String, event: NostrEvent)
+    case ok(eventId: String, success: Bool, reason: String)
+    case eose(subscriptionId: String)
+    case notice(String)
+    
+    init?(_ message: URLSessionWebSocketTask.Message) {
+        guard let data = message.data,
+              let array = try? JSONSerialization.jsonObject(with: data) as? [Any],
+              array.count >= 2,
+              let type = array[0] as? String else {
+            return nil
+        }
+
+        switch type {
+        case "EVENT":
+            if array.count >= 3,
+               let subId = array[1] as? String,
+               let eventDict = array[2] as? [String: Any],
+               let event = try? NostrEvent(from: eventDict) {
+                self = .event(subId: subId, event: event)
+                return
+            }
+            return nil
+        case "EOSE":
+            if let subId = array[1] as? String {
+                self = .eose(subscriptionId: subId)
+                return
+            }
+            return nil
+        case "OK":
+            if array.count >= 3,
+               let eventId = array[1] as? String,
+               let success = array[2] as? Bool {
+                let reason = array.count >= 4 ? (array[3] as? String ?? "no reason given") : "no reason given"
+                self = .ok(eventId: eventId, success: success, reason: reason)
+                return
+            }
+            return nil
+        case "NOTICE":
+            if array.count >= 2, let msg = array[1] as? String {
+                self = .notice(msg)
+                return
+            }
+            return nil
+        default:
+            return nil
+        }
+    }
+}
+
+private extension URLSessionWebSocketTask.Message {
+    var data: Data? {
+        switch self {
+        case .string(let text): text.data(using: .utf8)
+        case .data(let data):   data
+        @unknown default:       nil
+        }
+    }
 }
 
 // MARK: - Nostr Protocol Types
@@ -526,7 +883,37 @@ struct NostrFilter: Encodable {
         filter.kinds = [1059] // Gift wrap kind
         filter.since = since?.timeIntervalSince1970.toInt()
         filter.tagFilters = ["p": [pubkey]]
-        filter.limit = 100 // Add a reasonable limit
+        filter.limit = TransportConfig.nostrRelayDefaultFetchLimit // reasonable limit
+        return filter
+    }
+
+    // For location channels: geohash-scoped ephemeral events (kind 20000)
+    static func geohashEphemeral(_ geohash: String, since: Date? = nil, limit: Int = 200) -> NostrFilter {
+        var filter = NostrFilter()
+        filter.kinds = [20000]
+        filter.since = since?.timeIntervalSince1970.toInt()
+        filter.tagFilters = ["g": [geohash]]
+        filter.limit = limit
+        return filter
+    }
+
+    // For location notes: persistent text notes (kind 1) tagged with geohash
+    static func geohashNotes(_ geohash: String, since: Date? = nil, limit: Int = 200) -> NostrFilter {
+        var filter = NostrFilter()
+        filter.kinds = [1]
+        filter.since = since?.timeIntervalSince1970.toInt()
+        filter.tagFilters = ["g": [geohash]]
+        filter.limit = limit
+        return filter
+    }
+
+    // For location notes with neighbors: subscribe to multiple geohashes (center + neighbors)
+    static func geohashNotes(_ geohashes: [String], since: Date? = nil, limit: Int = 200) -> NostrFilter {
+        var filter = NostrFilter()
+        filter.kinds = [1]
+        filter.since = since?.timeIntervalSince1970.toInt()
+        filter.tagFilters = ["g": geohashes]
+        filter.limit = limit
         return filter
     }
 }

bitchat/Nostr/XChaCha20Poly1305Compat.swift

@@ -0,0 +1,135 @@
+import Foundation
+import CryptoKit
+
+/// Minimal XChaCha20-Poly1305 compatibility wrapper using CryptoKit's ChaChaPoly.
+/// Implements HChaCha20 to derive a subkey and reduces the 24-byte nonce to a 12-byte nonce
+/// as per XChaCha20 construction.
+enum XChaCha20Poly1305Compat {
+
+    /// Errors that can occur during XChaCha20-Poly1305 operations
+    enum Error: Swift.Error {
+        case invalidKeyLength(expected: Int, got: Int)
+        case invalidNonceLength(expected: Int, got: Int)
+    }
+
+    struct SealBox {
+        let ciphertext: Data
+        let tag: Data
+    }
+
+    static func seal(plaintext: Data, key: Data, nonce24: Data, aad: Data? = nil) throws -> SealBox {
+        guard key.count == 32 else {
+            throw Error.invalidKeyLength(expected: 32, got: key.count)
+        }
+        guard nonce24.count == 24 else {
+            throw Error.invalidNonceLength(expected: 24, got: nonce24.count)
+        }
+
+        let subkey = try hchacha20(key: key, nonce16: Data(nonce24.prefix(16)))
+        let nonce12 = derive12ByteNonce(from24: nonce24)
+        let chachaKey = SymmetricKey(data: subkey)
+        let nonce = try ChaChaPoly.Nonce(data: nonce12)
+        let sealed = try ChaChaPoly.seal(plaintext, using: chachaKey, nonce: nonce, authenticating: aad ?? Data())
+        return SealBox(ciphertext: sealed.ciphertext, tag: sealed.tag)
+    }
+
+    static func open(ciphertext: Data, tag: Data, key: Data, nonce24: Data, aad: Data? = nil) throws -> Data {
+        guard key.count == 32 else {
+            throw Error.invalidKeyLength(expected: 32, got: key.count)
+        }
+        guard nonce24.count == 24 else {
+            throw Error.invalidNonceLength(expected: 24, got: nonce24.count)
+        }
+
+        let subkey = try hchacha20(key: key, nonce16: Data(nonce24.prefix(16)))
+        let nonce12 = derive12ByteNonce(from24: nonce24)
+        let chachaKey = SymmetricKey(data: subkey)
+        let box = try ChaChaPoly.SealedBox(nonce: ChaChaPoly.Nonce(data: nonce12), ciphertext: ciphertext, tag: tag)
+        return try ChaChaPoly.open(box, using: chachaKey, authenticating: aad ?? Data())
+    }
+
+    // MARK: - Internals
+
+    private static func derive12ByteNonce(from24 nonce24: Data) -> Data {
+        // XChaCha20-Poly1305: 12-byte nonce = 4 zero bytes || last 8 bytes of the 24-byte nonce
+        var out = Data(count: 12)
+        out.replaceSubrange(0..<4, with: [0, 0, 0, 0])
+        out.replaceSubrange(4..<12, with: nonce24.suffix(8))
+        return out
+    }
+
+    private static func hchacha20(key: Data, nonce16: Data) throws -> Data {
+        // HChaCha20 based on the original ChaCha20 core with a 16-byte nonce.
+        guard key.count == 32 else {
+            throw Error.invalidKeyLength(expected: 32, got: key.count)
+        }
+        guard nonce16.count == 16 else {
+            throw Error.invalidNonceLength(expected: 16, got: nonce16.count)
+        }
+
+        // Constants "expand 32-byte k"
+        var state: [UInt32] = [
+            0x61707865, 0x3320646e, 0x79622d32, 0x6b206574,
+            // key (8 words)
+            key.loadLEWord(0), key.loadLEWord(4), key.loadLEWord(8), key.loadLEWord(12),
+            key.loadLEWord(16), key.loadLEWord(20), key.loadLEWord(24), key.loadLEWord(28),
+            // nonce (4 words)
+            nonce16.loadLEWord(0), nonce16.loadLEWord(4), nonce16.loadLEWord(8), nonce16.loadLEWord(12)
+        ]
+
+        // 20 rounds (10 double rounds)
+        for _ in 0..<10 {
+            // Column rounds
+            quarterRound(&state, 0, 4, 8, 12)
+            quarterRound(&state, 1, 5, 9, 13)
+            quarterRound(&state, 2, 6, 10, 14)
+            quarterRound(&state, 3, 7, 11, 15)
+            // Diagonal rounds
+            quarterRound(&state, 0, 5, 10, 15)
+            quarterRound(&state, 1, 6, 11, 12)
+            quarterRound(&state, 2, 7, 8, 13)
+            quarterRound(&state, 3, 4, 9, 14)
+        }
+
+        // Output subkey: state[0..3] and state[12..15]
+        var out = Data(count: 32)
+        out.storeLEWord(state[0], at: 0)
+        out.storeLEWord(state[1], at: 4)
+        out.storeLEWord(state[2], at: 8)
+        out.storeLEWord(state[3], at: 12)
+        out.storeLEWord(state[12], at: 16)
+        out.storeLEWord(state[13], at: 20)
+        out.storeLEWord(state[14], at: 24)
+        out.storeLEWord(state[15], at: 28)
+        return out
+    }
+
+    private static func quarterRound(_ s: inout [UInt32], _ a: Int, _ b: Int, _ c: Int, _ d: Int) {
+        s[a] = s[a] &+ s[b]; s[d] ^= s[a]; s[d] = (s[d] << 16) | (s[d] >> 16)
+        s[c] = s[c] &+ s[d]; s[b] ^= s[c]; s[b] = (s[b] << 12) | (s[b] >> 20)
+        s[a] = s[a] &+ s[b]; s[d] ^= s[a]; s[d] = (s[d] << 8)  | (s[d] >> 24)
+        s[c] = s[c] &+ s[d]; s[b] ^= s[c]; s[b] = (s[b] << 7)  | (s[b] >> 25)
+    }
+}
+
+private extension Data {
+    func loadLEWord(_ offset: Int) -> UInt32 {
+        let range = offset..<(offset+4)
+        let bytes = self[range]
+        return bytes.withUnsafeBytes { ptr -> UInt32 in
+            let b = ptr.bindMemory(to: UInt8.self)
+            return UInt32(b[0]) | (UInt32(b[1]) << 8) | (UInt32(b[2]) << 16) | (UInt32(b[3]) << 24)
+        }
+    }
+
+    mutating func storeLEWord(_ value: UInt32, at offset: Int) {
+        let bytes: [UInt8] = [
+            UInt8(value & 0xff),
+            UInt8((value >> 8) & 0xff),
+            UInt8((value >> 16) & 0xff),
+            UInt8((value >> 24) & 0xff)
+        ]
+        replaceSubrange(offset..<(offset+4), with: bytes)
+    }
+}
+

bitchat/Protocols/BinaryEncodingUtils.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import CryptoKit
 
 // MARK: - Hex Encoding/Decoding
 
@@ -16,6 +17,11 @@ extension Data {
         }
         return self.map { String(format: "%02x", $0) }.joined()
     }
+
+    func sha256Hex() -> String {
+        let digest = SHA256.hash(data: self)
+        return digest.map { String(format: "%02x", $0) }.joined()
+    }
     
     init?(hexString: String) {
         let len = hexString.count / 2
@@ -40,23 +46,23 @@ extension Data {
 extension Data {
     // MARK: Writing
     
-    mutating func appendUInt8(_ value: UInt8) {
+    @inlinable mutating func appendUInt8(_ value: UInt8) {
         self.append(value)
     }
     
-    mutating func appendUInt16(_ value: UInt16) {
+    @inlinable mutating func appendUInt16(_ value: UInt16) {
         self.append(UInt8((value >> 8) & 0xFF))
         self.append(UInt8(value & 0xFF))
     }
     
-    mutating func appendUInt32(_ value: UInt32) {
+    @inlinable mutating func appendUInt32(_ value: UInt32) {
         self.append(UInt8((value >> 24) & 0xFF))
         self.append(UInt8((value >> 16) & 0xFF))
         self.append(UInt8((value >> 8) & 0xFF))
         self.append(UInt8(value & 0xFF))
     }
     
-    mutating func appendUInt64(_ value: UInt64) {
+    @inlinable mutating func appendUInt64(_ value: UInt64) {
         for i in (0..<8).reversed() {
             self.append(UInt8((value >> (i * 8)) & 0xFF))
         }
@@ -113,21 +119,21 @@ extension Data {
     
     // MARK: Reading
     
-    func readUInt8(at offset: inout Int) -> UInt8? {
+    @inlinable func readUInt8(at offset: inout Int) -> UInt8? {
         guard offset >= 0 && offset < self.count else { return nil }
         let value = self[offset]
         offset += 1
         return value
     }
     
-    func readUInt16(at offset: inout Int) -> UInt16? {
+    @inlinable func readUInt16(at offset: inout Int) -> UInt16? {
         guard offset + 2 <= self.count else { return nil }
         let value = UInt16(self[offset]) << 8 | UInt16(self[offset + 1])
         offset += 2
         return value
     }
     
-    func readUInt32(at offset: inout Int) -> UInt32? {
+    @inlinable func readUInt32(at offset: inout Int) -> UInt32? {
         guard offset + 4 <= self.count else { return nil }
         let value = UInt32(self[offset]) << 24 |
                    UInt32(self[offset + 1]) << 16 |
@@ -137,7 +143,7 @@ extension Data {
         return value
     }
     
-    func readUInt64(at offset: inout Int) -> UInt64? {
+    @inlinable func readUInt64(at offset: inout Int) -> UInt64? {
         guard offset + 8 <= self.count else { return nil }
         var value: UInt64 = 0
         for i in 0..<8 {
@@ -197,7 +203,7 @@ extension Data {
         offset += 16
         
         // Convert 16 bytes to UUID string format
-        let uuid = uuidData.map { String(format: "%02x", $0) }.joined()
+        let uuid = uuidData.hexEncodedString()
         
         // Insert hyphens at proper positions: 8-4-4-4-12
         var result = ""
@@ -220,21 +226,3 @@ extension Data {
         return data
     }
 }
-
-// MARK: - Binary Message Protocol
-
-protocol BinaryEncodable {
-    func toBinaryData() -> Data
-    static func fromBinaryData(_ data: Data) -> Self?
-}
-
-// MARK: - Message Type Registry
-
-enum BinaryMessageType: UInt8 {
-    case deliveryAck = 0x01
-    case readReceipt = 0x02
-    case versionHello = 0x07
-    case versionAck = 0x08
-    case noiseIdentityAnnouncement = 0x09
-    case noiseMessage = 0x0A
-}

bitchat/Protocols/BinaryProtocol.swift

@@ -22,11 +22,11 @@
 ///
 /// ## Wire Format
 /// ```
-/// Header (Fixed 13 bytes):
-/// +--------+------+-----+-----------+-------+----------------+
-/// |Version | Type | TTL | Timestamp | Flags | PayloadLength  |
-/// |1 byte  |1 byte|1byte| 8 bytes   | 1 byte| 2 bytes        |
-/// +--------+------+-----+-----------+-------+----------------+
+/// Header (Fixed 14 bytes for v1, 16 bytes for v2):
+/// +--------+------+-----+-----------+-------+------------------+
+/// |Version | Type | TTL | Timestamp | Flags | PayloadLength    |
+/// |1 byte  |1 byte|1byte| 8 bytes   | 1 byte| 2 or 4 bytes     |
+/// +--------+------+-----+-----------+-------+------------------+
 ///
 /// Variable sections:
 /// +----------+-------------+---------+------------+
@@ -45,14 +45,14 @@
 ///
 /// ## Compression Strategy
 /// - Automatic compression for payloads > 256 bytes
-/// - LZ4 algorithm for speed over ratio
+/// - zlib compression for broad compatibility on Apple platforms
 /// - Original size stored for decompression
 /// - Flag bit indicates compressed payload
 ///
 /// ## Flag Bits
 /// - Bit 0: Has recipient ID (directed message)
 /// - Bit 1: Has signature (authenticated message)
-/// - Bit 2: Is compressed (LZ4 compression applied)
+/// - Bit 2: Is compressed (zlib compression applied)
 /// - Bits 3-7: Reserved for future use
 ///
 /// ## Size Constraints
@@ -89,6 +89,7 @@
 ///
 
 import Foundation
+import BitLogger
 
 extension Data {
     func trimmingNullBytes() -> Data {
@@ -105,78 +106,119 @@ extension Data {
 /// their binary wire format representation.
 /// - Note: All multi-byte values use network byte order (big-endian)
 struct BinaryProtocol {
-    static let headerSize = 13
+    static let v1HeaderSize = 14
+    static let v2HeaderSize = 16
     static let senderIDSize = 8
     static let recipientIDSize = 8
     static let signatureSize = 64
+
+    // Field offsets within packet header
+    struct Offsets {
+        static let version = 0
+        static let type = 1
+        static let ttl = 2
+        static let timestamp = 3
+        static let flags = 11  // After version(1) + type(1) + ttl(1) + timestamp(8)
+    }
+
+    static func headerSize(for version: UInt8) -> Int? {
+        switch version {
+        case 1: return v1HeaderSize
+        case 2: return v2HeaderSize
+        default: return nil
+        }
+    }
+
+    private static func lengthFieldSize(for version: UInt8) -> Int {
+        return version == 2 ? 4 : 2
+    }
     
     struct Flags {
         static let hasRecipient: UInt8 = 0x01
         static let hasSignature: UInt8 = 0x02
         static let isCompressed: UInt8 = 0x04
+        static let hasRoute: UInt8 = 0x08
     }
     
     // Encode BitchatPacket to binary format
-    static func encode(_ packet: BitchatPacket) -> Data? {
-        var data = Data()
-        
-        
-        // Try to compress payload if beneficial
+    static func encode(_ packet: BitchatPacket, padding: Bool = true) -> Data? {
+        let version = packet.version
+        guard version == 1 || version == 2 else { return nil }
+
+        // Try to compress payload when beneficial, keeping original size for later decoding
         var payload = packet.payload
-        var originalPayloadSize: UInt16? = nil
         var isCompressed = false
-        
+        var originalPayloadSize: Int?
         if CompressionUtil.shouldCompress(payload) {
-            if let compressedPayload = CompressionUtil.compress(payload) {
-                // Store original size for decompression (2 bytes after payload)
-                originalPayloadSize = UInt16(payload.count)
+            // Only compress when we can represent the original length in the outbound frame
+            let maxRepresentable = version == 2 ? Int(UInt32.max) : Int(UInt16.max)
+            if payload.count <= maxRepresentable,
+               let compressedPayload = CompressionUtil.compress(payload) {
+                originalPayloadSize = payload.count
                 payload = compressedPayload
                 isCompressed = true
-                
-            } else {
             }
-        } else {
         }
-        
-        // Header
-        data.append(packet.version)
+
+        let lengthFieldBytes = lengthFieldSize(for: version)
+        let originalRoute = packet.route ?? []
+        if originalRoute.contains(where: { $0.isEmpty }) { return nil }
+        let sanitizedRoute: [Data] = originalRoute.map { hop in
+            if hop.count == senderIDSize { return hop }
+            if hop.count > senderIDSize { return Data(hop.prefix(senderIDSize)) }
+            var padded = hop
+            padded.append(Data(repeating: 0, count: senderIDSize - hop.count))
+            return padded
+        }
+        guard sanitizedRoute.count <= 255 else { return nil }
+
+        let hasRoute = !sanitizedRoute.isEmpty
+        let routeLength = hasRoute ? 1 + sanitizedRoute.count * senderIDSize : 0
+        let originalSizeFieldBytes = isCompressed ? lengthFieldBytes : 0
+        let payloadDataSize = routeLength + payload.count + originalSizeFieldBytes
+
+        if version == 1 && payloadDataSize > Int(UInt16.max) { return nil }
+        if version == 2 && payloadDataSize > Int(UInt32.max) { return nil }
+
+        guard let headerSize = headerSize(for: version) else { return nil }
+        let estimatedHeader = headerSize + senderIDSize + (packet.recipientID == nil ? 0 : recipientIDSize)
+        let estimatedPayload = payloadDataSize
+        let estimatedSignature = (packet.signature == nil ? 0 : signatureSize)
+        var data = Data()
+        data.reserveCapacity(estimatedHeader + estimatedPayload + estimatedSignature + 255)
+
+        data.append(version)
         data.append(packet.type)
         data.append(packet.ttl)
-        
-        // Timestamp (8 bytes, big-endian)
-        for i in (0..<8).reversed() {
-            data.append(UInt8((packet.timestamp >> (i * 8)) & 0xFF))
+
+        for shift in stride(from: 56, through: 0, by: -8) {
+            data.append(UInt8((packet.timestamp >> UInt64(shift)) & 0xFF))
         }
-        
-        // Flags
+
         var flags: UInt8 = 0
-        if packet.recipientID != nil {
-            flags |= Flags.hasRecipient
-        }
-        if packet.signature != nil {
-            flags |= Flags.hasSignature
-        }
-        if isCompressed {
-            flags |= Flags.isCompressed
-        }
+        if packet.recipientID != nil { flags |= Flags.hasRecipient }
+        if packet.signature != nil { flags |= Flags.hasSignature }
+        if isCompressed { flags |= Flags.isCompressed }
+        if hasRoute { flags |= Flags.hasRoute }
         data.append(flags)
-        
-        // Payload length (2 bytes, big-endian) - includes original size if compressed
-        let payloadDataSize = payload.count + (isCompressed ? 2 : 0)
-        let payloadLength = UInt16(payloadDataSize)
-        
-        
-        data.append(UInt8((payloadLength >> 8) & 0xFF))
-        data.append(UInt8(payloadLength & 0xFF))
-        
-        // SenderID (exactly 8 bytes)
+
+        if version == 2 {
+            let length = UInt32(payloadDataSize)
+            for shift in stride(from: 24, through: 0, by: -8) {
+                data.append(UInt8((length >> UInt32(shift)) & 0xFF))
+            }
+        } else {
+            let length = UInt16(payloadDataSize)
+            data.append(UInt8((length >> 8) & 0xFF))
+            data.append(UInt8(length & 0xFF))
+        }
+
         let senderBytes = packet.senderID.prefix(senderIDSize)
         data.append(senderBytes)
         if senderBytes.count < senderIDSize {
             data.append(Data(repeating: 0, count: senderIDSize - senderBytes.count))
         }
-        
-        // RecipientID (if present)
+
         if let recipientID = packet.recipientID {
             let recipientBytes = recipientID.prefix(recipientIDSize)
             data.append(recipientBytes)
@@ -184,367 +226,193 @@ struct BinaryProtocol {
                 data.append(Data(repeating: 0, count: recipientIDSize - recipientBytes.count))
             }
         }
-        
-        // Payload (with original size prepended if compressed)
+
+        if hasRoute {
+            data.append(UInt8(sanitizedRoute.count))
+            for hop in sanitizedRoute {
+                data.append(hop)
+            }
+        }
+
         if isCompressed, let originalSize = originalPayloadSize {
-            // Prepend original size (2 bytes, big-endian)
-            data.append(UInt8((originalSize >> 8) & 0xFF))
-            data.append(UInt8(originalSize & 0xFF))
+            if version == 2 {
+                let value = UInt32(originalSize)
+                for shift in stride(from: 24, through: 0, by: -8) {
+                    data.append(UInt8((value >> UInt32(shift)) & 0xFF))
+                }
+            } else {
+                let value = UInt16(originalSize)
+                data.append(UInt8((value >> 8) & 0xFF))
+                data.append(UInt8(value & 0xFF))
+            }
         }
         data.append(payload)
-        
-        // Signature (if present)
+
         if let signature = packet.signature {
             data.append(signature.prefix(signatureSize))
         }
-        
-        
-        // Apply padding to standard block sizes for traffic analysis resistance
-        let optimalSize = MessagePadding.optimalBlockSize(for: data.count)
-        let paddedData = MessagePadding.pad(data, toSize: optimalSize)
-        
-        
-        return paddedData
+
+        if padding {
+            let optimalSize = MessagePadding.optimalBlockSize(for: data.count)
+            return MessagePadding.pad(data, toSize: optimalSize)
+        }
+        return data
     }
     
     // Decode binary data to BitchatPacket
     static func decode(_ data: Data) -> BitchatPacket? {
-        // Remove padding first
-        let unpaddedData = MessagePadding.unpad(data)
-        
-        
-        guard unpaddedData.count >= headerSize + senderIDSize else { 
-            return nil 
-        }
-        
-        var offset = 0
-        
-        // Header
-        let version = unpaddedData[offset]; offset += 1
-        // Check if version is supported
-        guard ProtocolVersion.isSupported(version) else { 
-            // Log unsupported version for debugging
-            return nil 
-        }
-        let type = unpaddedData[offset]; offset += 1
-        let ttl = unpaddedData[offset]; offset += 1
-        
-        // Timestamp
-        let timestampData = unpaddedData[offset..<offset+8]
-        let timestamp = timestampData.reduce(0) { result, byte in
-            (result << 8) | UInt64(byte)
-        }
-        offset += 8
-        
-        // Flags
-        let flags = unpaddedData[offset]; offset += 1
-        let hasRecipient = (flags & Flags.hasRecipient) != 0
-        let hasSignature = (flags & Flags.hasSignature) != 0
-        let isCompressed = (flags & Flags.isCompressed) != 0
-        
-        // Payload length
-        let payloadLengthData = unpaddedData[offset..<offset+2]
-        let payloadLength = payloadLengthData.reduce(0) { result, byte in
-            (result << 8) | UInt16(byte)
-        }
-        offset += 2
-        
-        // Calculate expected total size
-        var expectedSize = headerSize + senderIDSize + Int(payloadLength)
-        if hasRecipient {
-            expectedSize += recipientIDSize
-        }
-        if hasSignature {
-            expectedSize += signatureSize
-        }
-        
-        guard unpaddedData.count >= expectedSize else { 
-            return nil 
-        }
-        
-        // SenderID
-        let senderID = unpaddedData[offset..<offset+senderIDSize]
-        offset += senderIDSize
-        
-        // RecipientID
-        var recipientID: Data?
-        if hasRecipient {
-            recipientID = unpaddedData[offset..<offset+recipientIDSize]
-            offset += recipientIDSize
-        }
-        
-        // Payload
-        let payload: Data
-        if isCompressed {
-            // First 2 bytes are original size
-            guard Int(payloadLength) >= 2 else { return nil }
-            let originalSizeData = unpaddedData[offset..<offset+2]
-            let originalSize = Int(originalSizeData.reduce(0) { result, byte in
-                (result << 8) | UInt16(byte)
-            })
-            offset += 2
-            
-            // Compressed payload
-            let compressedPayload = unpaddedData[offset..<offset+Int(payloadLength)-2]
-            offset += Int(payloadLength) - 2
-            
-            // Decompress
-            guard let decompressedPayload = CompressionUtil.decompress(compressedPayload, originalSize: originalSize) else {
-                return nil
-            }
-            payload = decompressedPayload
-        } else {
-            payload = unpaddedData[offset..<offset+Int(payloadLength)]
-            offset += Int(payloadLength)
-        }
-        
-        // Signature
-        var signature: Data?
-        if hasSignature {
-            signature = unpaddedData[offset..<offset+signatureSize]
-        }
-        
-        return BitchatPacket(
-            type: type,
-            senderID: senderID,
-            recipientID: recipientID,
-            timestamp: timestamp,
-            payload: payload,
-            signature: signature,
-            ttl: ttl
-        )
+        // Try decode as-is first (robust when padding wasn't applied)
+        if let pkt = decodeCore(data) { return pkt }
+        // If that fails, try after removing padding
+        let unpadded = MessagePadding.unpad(data)
+        if unpadded as NSData === data as NSData { return nil }
+        return decodeCore(unpadded)
     }
-}
 
-// Binary encoding for BitchatMessage
-extension BitchatMessage {
-    func toBinaryPayload() -> Data? {
-        var data = Data()
-        
-        // Message format:
-        // - Flags: 1 byte (bit 0: isRelay, bit 1: isPrivate, bit 2: hasOriginalSender, bit 3: hasRecipientNickname, bit 4: hasSenderPeerID, bit 5: hasMentions)
-        // - Timestamp: 8 bytes (seconds since epoch)
-        // - ID length: 1 byte
-        // - ID: variable
-        // - Sender length: 1 byte
-        // - Sender: variable
-        // - Content length: 2 bytes
-        // - Content: variable
-        // Optional fields based on flags:
-        // - Original sender length + data
-        // - Recipient nickname length + data
-        // - Sender peer ID length + data
-        // - Mentions array
-        
-        var flags: UInt8 = 0
-        if isRelay { flags |= 0x01 }
-        if isPrivate { flags |= 0x02 }
-        if originalSender != nil { flags |= 0x04 }
-        if recipientNickname != nil { flags |= 0x08 }
-        if senderPeerID != nil { flags |= 0x10 }
-        if mentions != nil && !mentions!.isEmpty { flags |= 0x20 }
-        
-        data.append(flags)
-        
-        // Timestamp (in milliseconds)
-        let timestampMillis = UInt64(timestamp.timeIntervalSince1970 * 1000)
-        // Encode as 8 bytes, big-endian
-        for i in (0..<8).reversed() {
-            data.append(UInt8((timestampMillis >> (i * 8)) & 0xFF))
-        }
-        
-        // ID
-        if let idData = id.data(using: .utf8) {
-            data.append(UInt8(min(idData.count, 255)))
-            data.append(idData.prefix(255))
-        } else {
-            data.append(0)
-        }
-        
-        // Sender
-        if let senderData = sender.data(using: .utf8) {
-            data.append(UInt8(min(senderData.count, 255)))
-            data.append(senderData.prefix(255))
-        } else {
-            data.append(0)
-        }
-        
-        // Content
-        if let contentData = content.data(using: .utf8) {
-            let length = UInt16(min(contentData.count, 65535))
-            // Encode length as 2 bytes, big-endian
-            data.append(UInt8((length >> 8) & 0xFF))
-            data.append(UInt8(length & 0xFF))
-            data.append(contentData.prefix(Int(length)))
-        } else {
-            data.append(contentsOf: [0, 0])
-        }
-        
-        // Optional fields
-        if let originalSender = originalSender, let origData = originalSender.data(using: .utf8) {
-            data.append(UInt8(min(origData.count, 255)))
-            data.append(origData.prefix(255))
-        }
-        
-        if let recipientNickname = recipientNickname, let recipData = recipientNickname.data(using: .utf8) {
-            data.append(UInt8(min(recipData.count, 255)))
-            data.append(recipData.prefix(255))
-        }
-        
-        if let senderPeerID = senderPeerID, let peerData = senderPeerID.data(using: .utf8) {
-            data.append(UInt8(min(peerData.count, 255)))
-            data.append(peerData.prefix(255))
-        }
-        
-        // Mentions array
-        if let mentions = mentions {
-            data.append(UInt8(min(mentions.count, 255))) // Number of mentions
-            for mention in mentions.prefix(255) {
-                if let mentionData = mention.data(using: .utf8) {
-                    data.append(UInt8(min(mentionData.count, 255)))
-                    data.append(mentionData.prefix(255))
-                } else {
-                    data.append(0)
-                }
+    // Core decoding implementation used by decode(_:) with and without padding removal
+    private static func decodeCore(_ raw: Data) -> BitchatPacket? {
+        guard raw.count >= v1HeaderSize + senderIDSize else { return nil }
+
+        return raw.withUnsafeBytes { (buf: UnsafeRawBufferPointer) -> BitchatPacket? in
+            guard let base = buf.baseAddress else { return nil }
+            var offset = 0
+            func require(_ n: Int) -> Bool { offset + n <= buf.count }
+            func read8() -> UInt8? {
+                guard require(1) else { return nil }
+                let value = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self).pointee
+                offset += 1
+                return value
             }
-        }
-        
-        
-        return data
-    }
-    
-    static func fromBinaryPayload(_ data: Data) -> BitchatMessage? {
-        // Create an immutable copy to prevent threading issues
-        let dataCopy = Data(data)
-        
-        
-        guard dataCopy.count >= 13 else { 
-            return nil 
-        }
-        
-        var offset = 0
-        
-        // Flags
-        guard offset < dataCopy.count else { 
-            return nil 
-        }
-        let flags = dataCopy[offset]; offset += 1
-        let isRelay = (flags & 0x01) != 0
-        let isPrivate = (flags & 0x02) != 0
-        let hasOriginalSender = (flags & 0x04) != 0
-        let hasRecipientNickname = (flags & 0x08) != 0
-        let hasSenderPeerID = (flags & 0x10) != 0
-        let hasMentions = (flags & 0x20) != 0
-        
-        // Timestamp
-        guard offset + 8 <= dataCopy.count else { 
-            return nil 
-        }
-        let timestampData = dataCopy[offset..<offset+8]
-        let timestampMillis = timestampData.reduce(0) { result, byte in
-            (result << 8) | UInt64(byte)
-        }
-        offset += 8
-        let timestamp = Date(timeIntervalSince1970: TimeInterval(timestampMillis) / 1000.0)
-        
-        // ID
-        guard offset < dataCopy.count else { 
-            return nil 
-        }
-        let idLength = Int(dataCopy[offset]); offset += 1
-        guard offset + idLength <= dataCopy.count else { 
-            return nil 
-        }
-        let id = String(data: dataCopy[offset..<offset+idLength], encoding: .utf8) ?? UUID().uuidString
-        offset += idLength
-        
-        // Sender
-        guard offset < dataCopy.count else { 
-            return nil 
-        }
-        let senderLength = Int(dataCopy[offset]); offset += 1
-        guard offset + senderLength <= dataCopy.count else { 
-            return nil 
-        }
-        let sender = String(data: dataCopy[offset..<offset+senderLength], encoding: .utf8) ?? "unknown"
-        offset += senderLength
-        
-        // Content
-        guard offset + 2 <= dataCopy.count else { 
-            return nil 
-        }
-        let contentLengthData = dataCopy[offset..<offset+2]
-        let contentLength = Int(contentLengthData.reduce(0) { result, byte in
-            (result << 8) | UInt16(byte)
-        })
-        offset += 2
-        guard offset + contentLength <= dataCopy.count else { 
-            return nil 
-        }
-        
-        let content = String(data: dataCopy[offset..<offset+contentLength], encoding: .utf8) ?? ""
-        offset += contentLength
-        
-        // Optional fields
-        var originalSender: String?
-        if hasOriginalSender && offset < dataCopy.count {
-            let length = Int(dataCopy[offset]); offset += 1
-            if offset + length <= dataCopy.count {
-                originalSender = String(data: dataCopy[offset..<offset+length], encoding: .utf8)
-                offset += length
+            func read16() -> UInt16? {
+                guard require(2) else { return nil }
+                let ptr = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self)
+                let value = (UInt16(ptr[0]) << 8) | UInt16(ptr[1])
+                offset += 2
+                return value
             }
-        }
-        
-        var recipientNickname: String?
-        if hasRecipientNickname && offset < dataCopy.count {
-            let length = Int(dataCopy[offset]); offset += 1
-            if offset + length <= dataCopy.count {
-                recipientNickname = String(data: dataCopy[offset..<offset+length], encoding: .utf8)
-                offset += length
+            func read32() -> UInt32? {
+                guard require(4) else { return nil }
+                let ptr = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self)
+                let value = (UInt32(ptr[0]) << 24) | (UInt32(ptr[1]) << 16) | (UInt32(ptr[2]) << 8) | UInt32(ptr[3])
+                offset += 4
+                return value
             }
-        }
-        
-        var senderPeerID: String?
-        if hasSenderPeerID && offset < dataCopy.count {
-            let length = Int(dataCopy[offset]); offset += 1
-            if offset + length <= dataCopy.count {
-                senderPeerID = String(data: dataCopy[offset..<offset+length], encoding: .utf8)
-                offset += length
+            func readData(_ n: Int) -> Data? {
+                guard require(n) else { return nil }
+                let ptr = base.advanced(by: offset)
+                let data = Data(bytes: ptr, count: n)
+                offset += n
+                return data
             }
-        }
-        
-        // Mentions array
-        var mentions: [String]?
-        if hasMentions && offset < dataCopy.count {
-            let mentionCount = Int(dataCopy[offset]); offset += 1
-            if mentionCount > 0 {
-                mentions = []
-                for _ in 0..<mentionCount {
-                    if offset < dataCopy.count {
-                        let length = Int(dataCopy[offset]); offset += 1
-                        if offset + length <= dataCopy.count {
-                            if let mention = String(data: dataCopy[offset..<offset+length], encoding: .utf8) {
-                                mentions?.append(mention)
-                            }
-                            offset += length
-                        }
+
+            guard let version = read8(), version == 1 || version == 2 else { return nil }
+            let lengthFieldBytes = lengthFieldSize(for: version)
+            guard let headerSize = headerSize(for: version) else { return nil }
+            let minimumRequired = headerSize + senderIDSize
+            guard raw.count >= minimumRequired else { return nil }
+
+            guard let type = read8(), let ttl = read8() else { return nil }
+
+            var timestamp: UInt64 = 0
+            for _ in 0..<8 {
+                guard let byte = read8() else { return nil }
+                timestamp = (timestamp << 8) | UInt64(byte)
+            }
+
+            guard let flags = read8() else { return nil }
+            let hasRecipient = (flags & Flags.hasRecipient) != 0
+            let hasSignature = (flags & Flags.hasSignature) != 0
+            let isCompressed = (flags & Flags.isCompressed) != 0
+
+            let payloadLength: Int
+            if version == 2 {
+                guard let len = read32() else { return nil }
+                payloadLength = Int(len)
+            } else {
+                guard let len = read16() else { return nil }
+                payloadLength = Int(len)
+            }
+
+            guard payloadLength >= 0 else { return nil }
+
+            guard let senderID = readData(senderIDSize) else { return nil }
+
+            var recipientID: Data? = nil
+            if hasRecipient {
+                recipientID = readData(recipientIDSize)
+                if recipientID == nil { return nil }
+            }
+
+            var route: [Data]? = nil
+            var remainingPayloadBytes = payloadLength
+
+            if (flags & Flags.hasRoute) != 0 {
+                guard remainingPayloadBytes >= 1, let routeCount = read8() else { return nil }
+                remainingPayloadBytes -= 1
+                if routeCount > 0 {
+                    var hops: [Data] = []
+                    for _ in 0..<Int(routeCount) {
+                        guard remainingPayloadBytes >= senderIDSize,
+                              let hop = readData(senderIDSize) else { return nil }
+                        remainingPayloadBytes -= senderIDSize
+                        hops.append(hop)
                     }
+                    route = hops
                 }
             }
+
+            let payload: Data
+            if isCompressed {
+                guard remainingPayloadBytes >= lengthFieldBytes else { return nil }
+                let originalSize: Int
+                if version == 2 {
+                    guard let rawSize = read32() else { return nil }
+                    originalSize = Int(rawSize)
+                } else {
+                    guard let rawSize = read16() else { return nil }
+                    originalSize = Int(rawSize)
+                }
+                remainingPayloadBytes -= lengthFieldBytes
+                guard originalSize >= 0 && originalSize <= FileTransferLimits.maxFramedFileBytes else { return nil }
+                let compressedSize = remainingPayloadBytes
+                guard compressedSize > 0, let compressed = readData(compressedSize) else { return nil }
+                remainingPayloadBytes = 0
+
+                let compressionRatio = Double(originalSize) / Double(compressedSize)
+                guard compressionRatio <= 50_000.0 else {
+                    SecureLogger.warning("🚫 Suspicious compression ratio: \(String(format: "%.0f", compressionRatio)):1", category: .security)
+                    return nil
+                }
+
+                guard let decompressed = CompressionUtil.decompress(compressed, originalSize: originalSize),
+                      decompressed.count == originalSize else { return nil }
+                payload = decompressed
+            } else {
+                guard remainingPayloadBytes >= 0,
+                      let rawPayload = readData(remainingPayloadBytes) else { return nil }
+                remainingPayloadBytes = 0
+                payload = rawPayload
+            }
+
+            var signature: Data? = nil
+            if hasSignature {
+                signature = readData(signatureSize)
+                if signature == nil { return nil }
+            }
+
+            guard offset <= buf.count else { return nil }
+
+            return BitchatPacket(
+                type: type,
+                senderID: senderID,
+                recipientID: recipientID,
+                timestamp: timestamp,
+                payload: payload,
+                signature: signature,
+                ttl: ttl,
+                version: version,
+                route: route
+            )
         }
-        
-        let message = BitchatMessage(
-            id: id,
-            sender: sender,
-            content: content,
-            timestamp: timestamp,
-            isRelay: isRelay,
-            originalSender: originalSender,
-            isPrivate: isPrivate,
-            recipientNickname: recipientNickname,
-            senderPeerID: senderPeerID,
-            mentions: mentions
-        )
-        return message
     }
 }

bitchat/Protocols/BitchatFilePacket.swift

@@ -0,0 +1,155 @@
+//
+// BitchatFilePacket.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+import BitLogger
+
+/// TLV payload for Bluetooth mesh file transfers (voice notes, images, generic files).
+/// Mirrors the Android client specification to ensure cross-platform interoperability.
+struct BitchatFilePacket {
+    var fileName: String?
+    var fileSize: UInt64?
+    var mimeType: String?
+    var content: Data
+
+    /// Canonical TLV tags defined by the Android implementation.
+    private enum TLVType: UInt8 {
+        case fileName = 0x01
+        case fileSize = 0x02
+        case mimeType = 0x03
+        case content = 0x04
+    }
+
+    /// Encodes the packet using v2 canonical TLVs (4-byte FILE_SIZE, 4-byte CONTENT length).
+    /// Returns `nil` when fields exceed protocol limits (e.g., content > UInt32.max).
+    func encode() -> Data? {
+        let resolvedSize = fileSize ?? UInt64(content.count)
+        guard resolvedSize <= UInt64(UInt32.max) else { return nil }
+        guard resolvedSize <= UInt64(FileTransferLimits.maxPayloadBytes) else { return nil }
+        guard content.count <= Int(UInt32.max) else { return nil }
+        guard FileTransferLimits.isValidPayload(content.count) else { return nil }
+
+        func appendBE<T: FixedWidthInteger>(_ value: T, into data: inout Data) {
+            var big = value.bigEndian
+            withUnsafeBytes(of: &big) { data.append(contentsOf: $0) }
+        }
+
+        var encoded = Data()
+
+        if let name = fileName, let nameData = name.data(using: .utf8), nameData.count <= Int(UInt16.max) {
+            encoded.append(TLVType.fileName.rawValue)
+            appendBE(UInt16(nameData.count), into: &encoded)
+            encoded.append(nameData)
+        }
+
+        encoded.append(TLVType.fileSize.rawValue)
+        appendBE(UInt16(4), into: &encoded)
+        appendBE(UInt32(resolvedSize), into: &encoded)
+
+        if let mime = mimeType, let mimeData = mime.data(using: .utf8), mimeData.count <= Int(UInt16.max) {
+            encoded.append(TLVType.mimeType.rawValue)
+            appendBE(UInt16(mimeData.count), into: &encoded)
+            encoded.append(mimeData)
+        }
+
+        encoded.append(TLVType.content.rawValue)
+        appendBE(UInt32(content.count), into: &encoded)
+        encoded.append(content)
+
+        return encoded
+    }
+
+    /// Decodes TLV payloads, tolerating legacy encodings (FILE_SIZE len=8, CONTENT len=2) when possible.
+    static func decode(_ data: Data) -> BitchatFilePacket? {
+        var cursor = data.startIndex
+        let end = data.endIndex
+
+        var fileName: String?
+        var fileSize: UInt64?
+        var mimeType: String?
+        var content = Data()
+
+        while cursor < end {
+            let typeRaw = data[cursor]
+            cursor = data.index(after: cursor)
+
+            guard cursor <= end else { return nil }
+            let tlvType = TLVType(rawValue: typeRaw)
+
+            func readBigEndianLength(bytes: Int) -> Int? {
+                guard data.distance(from: cursor, to: end) >= bytes else { return nil }
+                // Use UInt64 to prevent integer overflow during shift operations
+                var result: UInt64 = 0
+                for _ in 0..<bytes {
+                    result = (result << 8) | UInt64(data[cursor])
+                    cursor = data.index(after: cursor)
+                }
+                // Safely convert to Int with overflow check
+                guard result <= Int.max else { return nil }
+                return Int(result)
+            }
+
+            let length: Int?
+            if tlvType == .content {
+                let snapshot = cursor
+                let canonical = readBigEndianLength(bytes: 4)
+                if let canonical = canonical,
+                   canonical <= data.distance(from: cursor, to: end) {
+                    length = canonical
+                } else {
+                    cursor = snapshot
+                    length = readBigEndianLength(bytes: 2)
+                }
+            } else {
+                length = readBigEndianLength(bytes: 2)
+            }
+
+            guard let tlvLength = length, tlvLength >= 0 else { return nil }
+            guard data.distance(from: cursor, to: end) >= tlvLength else { return nil }
+
+            let valueStart = cursor
+            cursor = data.index(cursor, offsetBy: tlvLength)
+            let value = data[valueStart..<cursor]
+
+            switch tlvType {
+            case .fileName:
+                fileName = String(data: Data(value), encoding: .utf8)
+            case .fileSize:
+                if tlvLength == 4 || tlvLength == 8 {
+                    var size: UInt64 = 0
+                    for byte in value {
+                        size = (size << 8) | UInt64(byte)
+                    }
+                    if size > UInt64(FileTransferLimits.maxPayloadBytes) {
+                        return nil
+                    }
+                    fileSize = size
+                }
+            case .mimeType:
+                mimeType = String(data: Data(value), encoding: .utf8)
+            case .content:
+                let proposedSize = content.count + value.count
+                if proposedSize > FileTransferLimits.maxPayloadBytes {
+                    return nil
+                }
+                content.append(contentsOf: value)
+            case nil:
+                continue
+            }
+        }
+
+        guard !content.isEmpty else { return nil }
+        guard FileTransferLimits.isValidPayload(content.count) else { return nil }
+        return BitchatFilePacket(
+            fileName: fileName,
+            fileSize: fileSize ?? UInt64(content.count),
+            mimeType: mimeType,
+            content: content
+        )
+    }
+}

bitchat/Protocols/Geohash.swift

@@ -0,0 +1,175 @@
+import Foundation
+
+/// Lightweight Geohash encoder used for Location Channels.
+/// Encodes latitude/longitude to base32 geohash with a fixed precision.
+enum Geohash {
+    private static let base32Chars = Array("0123456789bcdefghjkmnpqrstuvwxyz")
+    private static let base32Map: [Character: Int] = {
+        var map: [Character: Int] = [:]
+        for (i, c) in base32Chars.enumerated() { map[c] = i }
+        return map
+    }()
+
+    /// Validates a geohash string for building-level precision (8 characters).
+    /// - Parameter geohash: The geohash string to validate
+    /// - Returns: true if valid 8-character base32 geohash, false otherwise
+    static func isValidBuildingGeohash(_ geohash: String) -> Bool {
+        guard geohash.count == 8 else { return false }
+        return geohash.lowercased().allSatisfy { base32Map[$0] != nil }
+    }
+
+    /// Encodes the provided coordinates into a geohash string.
+    /// - Parameters:
+    ///   - latitude: Latitude in degrees (-90...90)
+    ///   - longitude: Longitude in degrees (-180...180)
+    ///   - precision: Number of geohash characters (2-12 typical). Values <= 0 return an empty string.
+    /// - Returns: Base32 geohash string of length `precision`.
+    static func encode(latitude: Double, longitude: Double, precision: Int) -> String {
+        guard precision > 0 else { return "" }
+
+        var latInterval: (Double, Double) = (-90.0, 90.0)
+        var lonInterval: (Double, Double) = (-180.0, 180.0)
+
+        var isEven = true
+        var bit = 0
+        var ch = 0
+        var geohash: [Character] = []
+
+        let lat = max(-90.0, min(90.0, latitude))
+        let lon = max(-180.0, min(180.0, longitude))
+
+        while geohash.count < precision {
+            if isEven {
+                let mid = (lonInterval.0 + lonInterval.1) / 2
+                if lon >= mid {
+                    ch |= (1 << (4 - bit))
+                    lonInterval.0 = mid
+                } else {
+                    lonInterval.1 = mid
+                }
+            } else {
+                let mid = (latInterval.0 + latInterval.1) / 2
+                if lat >= mid {
+                    ch |= (1 << (4 - bit))
+                    latInterval.0 = mid
+                } else {
+                    latInterval.1 = mid
+                }
+            }
+
+            isEven.toggle()
+            if bit < 4 {
+                bit += 1
+            } else {
+                geohash.append(base32Chars[ch])
+                bit = 0
+                ch = 0
+            }
+        }
+
+        return String(geohash)
+    }
+
+    /// Decodes a geohash into the center latitude/longitude of its bounding box.
+    /// - Parameter geohash: Base32 geohash string.
+    /// - Returns: (lat, lon) center coordinate.
+    static func decodeCenter(_ geohash: String) -> (lat: Double, lon: Double) {
+        var latInterval: (Double, Double) = (-90.0, 90.0)
+        var lonInterval: (Double, Double) = (-180.0, 180.0)
+
+        var isEven = true
+        for ch in geohash.lowercased() {
+            guard let cd = base32Map[ch] else { continue }
+            for mask in [16, 8, 4, 2, 1] {
+                if isEven {
+                    let mid = (lonInterval.0 + lonInterval.1) / 2
+                    if (cd & mask) != 0 { lonInterval.0 = mid } else { lonInterval.1 = mid }
+                } else {
+                    let mid = (latInterval.0 + latInterval.1) / 2
+                    if (cd & mask) != 0 { latInterval.0 = mid } else { latInterval.1 = mid }
+                }
+                isEven.toggle()
+            }
+        }
+        let lat = (latInterval.0 + latInterval.1) / 2
+        let lon = (lonInterval.0 + lonInterval.1) / 2
+        return (lat, lon)
+    }
+
+    /// Decodes a geohash into its latitude and longitude bounds.
+    /// - Parameter geohash: Base32 geohash string.
+    /// - Returns: (latMin, latMax, lonMin, lonMax)
+    static func decodeBounds(_ geohash: String) -> (latMin: Double, latMax: Double, lonMin: Double, lonMax: Double) {
+        var latInterval: (Double, Double) = (-90.0, 90.0)
+        var lonInterval: (Double, Double) = (-180.0, 180.0)
+
+        var isEven = true
+        for ch in geohash.lowercased() {
+            guard let cd = base32Map[ch] else { continue }
+            for mask in [16, 8, 4, 2, 1] {
+                if isEven {
+                    let mid = (lonInterval.0 + lonInterval.1) / 2
+                    if (cd & mask) != 0 { lonInterval.0 = mid } else { lonInterval.1 = mid }
+                } else {
+                    let mid = (latInterval.0 + latInterval.1) / 2
+                    if (cd & mask) != 0 { latInterval.0 = mid } else { latInterval.1 = mid }
+                }
+                isEven.toggle()
+            }
+        }
+        return (latInterval.0, latInterval.1, lonInterval.0, lonInterval.1)
+    }
+
+    /// Returns all 8 neighboring geohash cells at the same precision.
+    /// - Parameter geohash: Base32 geohash string.
+    /// - Returns: Array of 8 neighboring geohashes (N, NE, E, SE, S, SW, W, NW order).
+    static func neighbors(of geohash: String) -> [String] {
+        guard !geohash.isEmpty else { return [] }
+
+        let precision = geohash.count
+        let bounds = decodeBounds(geohash)
+        let center = decodeCenter(geohash)
+
+        // Calculate cell dimensions
+        let latHeight = bounds.latMax - bounds.latMin
+        let lonWidth = bounds.lonMax - bounds.lonMin
+
+        // Helper to wrap longitude around ±180
+        func wrapLongitude(_ lon: Double) -> Double {
+            var wrapped = lon
+            while wrapped > 180.0 { wrapped -= 360.0 }
+            while wrapped < -180.0 { wrapped += 360.0 }
+            return wrapped
+        }
+
+        // Helper to clamp latitude to ±90
+        func clampLatitude(_ lat: Double) -> Double {
+            return max(-90.0, min(90.0, lat))
+        }
+
+        // Calculate 8 neighbor centers
+        let neighbors: [(lat: Double, lon: Double)] = [
+            (center.lat + latHeight, center.lon),                    // N
+            (center.lat + latHeight, center.lon + lonWidth),         // NE
+            (center.lat, center.lon + lonWidth),                     // E
+            (center.lat - latHeight, center.lon + lonWidth),         // SE
+            (center.lat - latHeight, center.lon),                    // S
+            (center.lat - latHeight, center.lon - lonWidth),         // SW
+            (center.lat, center.lon - lonWidth),                     // W
+            (center.lat + latHeight, center.lon - lonWidth)          // NW
+        ]
+
+        // Encode each neighbor, handling boundary conditions
+        return neighbors.compactMap { neighbor in
+            let lat = clampLatitude(neighbor.lat)
+            let lon = wrapLongitude(neighbor.lon)
+
+            // Skip if we've crossed a pole (latitude clamped to boundary)
+            if (neighbor.lat > 90.0 || neighbor.lat < -90.0) {
+                return nil
+            }
+
+            return encode(latitude: lat, longitude: lon, precision: precision)
+        }
+    }
+}

bitchat/Protocols/LocationChannel.swift

@@ -0,0 +1,133 @@
+import Foundation
+
+/// Levels of location channels mapped to geohash precisions.
+enum GeohashChannelLevel: CaseIterable, Codable, Equatable {
+    case building
+    case block
+    case neighborhood
+    case city
+    case province   // previously .region
+    case region     // previously .country
+
+    /// Geohash length used for this level.
+    var precision: Int {
+        switch self {
+        case .building: return 8
+        case .block: return 7
+        case .neighborhood: return 6
+        case .city: return 5
+        case .province: return 4
+        case .region: return 2
+    }
+    }
+
+    var displayName: String {
+        switch self {
+        case .building:
+            return String(localized: "location_levels.building", comment: "Name for building-level location channel")
+        case .block:
+            return String(localized: "location_levels.block", comment: "Name for block-level location channel")
+        case .neighborhood:
+            return String(localized: "location_levels.neighborhood", comment: "Name for neighborhood-level location channel")
+        case .city:
+            return String(localized: "location_levels.city", comment: "Name for city-level location channel")
+        case .province:
+            return String(localized: "location_levels.province", comment: "Name for province-level location channel")
+        case .region:
+            return String(localized: "location_levels.region", comment: "Name for region-level location channel")
+        }
+    }
+}
+// Backward-compatible Codable for renamed cases
+extension GeohashChannelLevel {
+    init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        if let raw = try? container.decode(String.self) {
+            switch raw {
+            case "building": self = .building
+            case "block": self = .block
+            case "neighborhood": self = .neighborhood
+            case "city": self = .city
+            case "region": self = .province      // old "region" maps to new .province
+            case "country": self = .region       // old "country" maps to new .region
+            case "province": self = .province
+            default:
+                self = .block
+            }
+        } else if let precision = try? container.decode(Int.self) {
+            switch precision {
+            case 8: self = .building
+            case 7: self = .block
+            case 6: self = .neighborhood
+            case 5: self = .city
+            case 4: self = .province
+            case 0...3: self = .region
+            default: self = .block
+            }
+        } else {
+            self = .block
+        }
+    }
+
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        switch self {
+        case .building: try container.encode("building")
+        case .block: try container.encode("block")
+        case .neighborhood: try container.encode("neighborhood")
+        case .city: try container.encode("city")
+        case .province: try container.encode("province")
+        case .region: try container.encode("region")
+        }
+    }
+}
+
+/// A computed geohash channel option.
+struct GeohashChannel: Codable, Equatable, Hashable, Identifiable {
+    let level: GeohashChannelLevel
+    let geohash: String
+
+    var id: String { "\(level)-\(geohash)" }
+
+    var displayName: String {
+        "\(level.displayName) • \(geohash)"
+    }
+}
+
+/// Identifier for current public chat channel (mesh or a location geohash).
+enum ChannelID: Equatable, Codable {
+    case mesh
+    case location(GeohashChannel)
+
+    /// Human readable name for UI.
+    var displayName: String {
+        switch self {
+        case .mesh:
+            return "Mesh"
+        case .location(let ch):
+            return ch.displayName
+        }
+    }
+
+    /// Nostr tag value for scoping (geohash), if applicable.
+    var nostrGeohashTag: String? {
+        switch self {
+        case .mesh: return nil
+        case .location(let ch): return ch.geohash
+        }
+    }
+    
+    var isMesh: Bool {
+        switch self {
+        case .mesh:     true
+        case .location: false
+        }
+    }
+    
+    var isLocation: Bool {
+        switch self {
+        case .mesh:     false
+        case .location: true
+        }
+    }
+}

bitchat/Protocols/Packets.swift

@@ -0,0 +1,162 @@
+import Foundation
+
+// MARK: - Protocol TLV Packets
+
+struct AnnouncementPacket {
+    let nickname: String
+    let noisePublicKey: Data            // Noise static public key (Curve25519.KeyAgreement)
+    let signingPublicKey: Data          // Ed25519 public key for signing
+    let directNeighbors: [Data]?        // 8-byte peer IDs
+
+    private enum TLVType: UInt8 {
+        case nickname = 0x01
+        case noisePublicKey = 0x02
+        case signingPublicKey = 0x03
+        case directNeighbors = 0x04
+    }
+
+    func encode() -> Data? {
+        var data = Data()
+        // Reserve: TLVs for nickname (2 + n), noise key (2 + 32), signing key (2 + 32)
+        data.reserveCapacity(2 + min(nickname.count, 255) + 2 + noisePublicKey.count + 2 + signingPublicKey.count)
+
+        // TLV for nickname
+        guard let nicknameData = nickname.data(using: .utf8), nicknameData.count <= 255 else { return nil }
+        data.append(TLVType.nickname.rawValue)
+        data.append(UInt8(nicknameData.count))
+        data.append(nicknameData)
+
+        // TLV for noise public key
+        guard noisePublicKey.count <= 255 else { return nil }
+        data.append(TLVType.noisePublicKey.rawValue)
+        data.append(UInt8(noisePublicKey.count))
+        data.append(noisePublicKey)
+
+        // TLV for signing public key
+        guard signingPublicKey.count <= 255 else { return nil }
+        data.append(TLVType.signingPublicKey.rawValue)
+        data.append(UInt8(signingPublicKey.count))
+        data.append(signingPublicKey)
+        
+        // TLV for direct neighbors (optional)
+        if let neighbors = directNeighbors, !neighbors.isEmpty {
+            let neighborsData = neighbors.prefix(10).reduce(Data()) { $0 + $1 }
+            if !neighborsData.isEmpty && neighborsData.count % 8 == 0 {
+                data.append(TLVType.directNeighbors.rawValue)
+                data.append(UInt8(neighborsData.count))
+                data.append(neighborsData)
+            }
+        }
+
+        return data
+    }
+
+    static func decode(from data: Data) -> AnnouncementPacket? {
+        var offset = 0
+        var nickname: String?
+        var noisePublicKey: Data?
+        var signingPublicKey: Data?
+        var directNeighbors: [Data]?
+
+        while offset + 2 <= data.count {
+            let typeRaw = data[offset]
+            offset += 1
+            let length = Int(data[offset])
+            offset += 1
+
+            guard offset + length <= data.count else { return nil }
+            let value = data[offset..<offset + length]
+            offset += length
+
+            if let type = TLVType(rawValue: typeRaw) {
+                switch type {
+                case .nickname:
+                    nickname = String(data: value, encoding: .utf8)
+                case .noisePublicKey:
+                    noisePublicKey = Data(value)
+                case .signingPublicKey:
+                    signingPublicKey = Data(value)
+                case .directNeighbors:
+                    if length > 0 && length % 8 == 0 {
+                        var neighbors = [Data]()
+                        let count = length / 8
+                        for i in 0..<count {
+                            let start = value.startIndex + i * 8
+                            let end = start + 8
+                            neighbors.append(Data(value[start..<end]))
+                        }
+                        directNeighbors = neighbors
+                    }
+                }
+            } else {
+                // Unknown TLV; skip (tolerant decoder for forward compatibility)
+                continue
+            }
+        }
+
+        guard let nickname = nickname, let noisePublicKey = noisePublicKey, let signingPublicKey = signingPublicKey else { return nil }
+        return AnnouncementPacket(
+            nickname: nickname,
+            noisePublicKey: noisePublicKey,
+            signingPublicKey: signingPublicKey,
+            directNeighbors: directNeighbors
+        )
+    }
+}
+
+struct PrivateMessagePacket {
+    let messageID: String
+    let content: String
+
+    private enum TLVType: UInt8 {
+        case messageID = 0x00
+        case content = 0x01
+    }
+
+    func encode() -> Data? {
+        var data = Data()
+        data.reserveCapacity(2 + min(messageID.count, 255) + 2 + min(content.count, 255))
+
+        // TLV for messageID
+        guard let messageIDData = messageID.data(using: .utf8), messageIDData.count <= 255 else { return nil }
+        data.append(TLVType.messageID.rawValue)
+        data.append(UInt8(messageIDData.count))
+        data.append(messageIDData)
+
+        // TLV for content
+        guard let contentData = content.data(using: .utf8), contentData.count <= 255 else { return nil }
+        data.append(TLVType.content.rawValue)
+        data.append(UInt8(contentData.count))
+        data.append(contentData)
+
+        return data
+    }
+
+    static func decode(from data: Data) -> PrivateMessagePacket? {
+        var offset = 0
+        var messageID: String?
+        var content: String?
+
+        while offset + 2 <= data.count {
+            guard let type = TLVType(rawValue: data[offset]) else { return nil }
+            offset += 1
+
+            let length = Int(data[offset])
+            offset += 1
+
+            guard offset + length <= data.count else { return nil }
+            let value = data[offset..<offset + length]
+            offset += length
+
+            switch type {
+            case .messageID:
+                messageID = String(data: value, encoding: .utf8)
+            case .content:
+                content = String(data: value, encoding: .utf8)
+            }
+        }
+
+        guard let messageID = messageID, let content = content else { return nil }
+        return PrivateMessagePacket(messageID: messageID, content: content)
+    }
+}

bitchat/Services/AutocompleteService.swift

@@ -0,0 +1,104 @@
+//
+// AutocompleteService.swift
+// bitchat
+//
+// Handles autocomplete suggestions for mentions and commands
+// This is free and unencumbered software released into the public domain.
+//
+
+import Foundation
+
+/// Manages autocomplete functionality for chat
+final class AutocompleteService {
+    private let mentionRegex = try? NSRegularExpression(pattern: "@([\\p{L}0-9_]*)$", options: [])
+    private let commandRegex = try? NSRegularExpression(pattern: "^/([a-z]*)$", options: [])
+    
+    private let commands = [
+        "/msg", "/who", "/clear",
+        "/hug", "/slap", "/fav", "/unfav",
+        "/block", "/unblock"
+    ]
+    
+    /// Get autocomplete suggestions for current text
+    func getSuggestions(for text: String, peers: [String], cursorPosition: Int) -> (suggestions: [String], range: NSRange?) {
+        let textToPosition = String(text.prefix(cursorPosition))
+        
+        // Check for mention autocomplete
+        if let (mentionSuggestions, mentionRange) = getMentionSuggestions(textToPosition, peers: peers) {
+            return (mentionSuggestions, mentionRange)
+        }
+        
+        // Don't handle command autocomplete here - ContentView handles it with better UI
+        // if let (commandSuggestions, commandRange) = getCommandSuggestions(textToPosition) {
+        //     return (commandSuggestions, commandRange)
+        // }
+        
+        return ([], nil)
+    }
+    
+    /// Apply selected suggestion to text
+    func applySuggestion(_ suggestion: String, to text: String, range: NSRange) -> String {
+        guard let textRange = Range(range, in: text) else { return text }
+        
+        var replacement = suggestion
+        
+        // Add space after command if it takes arguments
+        if suggestion.hasPrefix("/") && needsArgument(command: suggestion) {
+            replacement += " "
+        }
+        
+        return text.replacingCharacters(in: textRange, with: replacement)
+    }
+    
+    // MARK: - Private Methods
+    
+    private func getMentionSuggestions(_ text: String, peers: [String]) -> ([String], NSRange)? {
+        guard let regex = mentionRegex else { return nil }
+        
+        let nsText = text as NSString
+        let matches = regex.matches(in: text, options: [], range: NSRange(location: 0, length: nsText.length))
+        
+        guard let match = matches.last else { return nil }
+        
+        let fullRange = match.range(at: 0)
+        let captureRange = match.range(at: 1)
+        let prefix = nsText.substring(with: captureRange).lowercased()
+        
+        let suggestions = peers
+            .filter { $0.lowercased().hasPrefix(prefix) }
+            .sorted()
+            .prefix(5)
+            .map { "@\($0)" }
+        
+        return suggestions.isEmpty ? nil : (Array(suggestions), fullRange)
+    }
+    
+    private func getCommandSuggestions(_ text: String) -> ([String], NSRange)? {
+        guard let regex = commandRegex else { return nil }
+        
+        let nsText = text as NSString
+        let matches = regex.matches(in: text, options: [], range: NSRange(location: 0, length: nsText.length))
+        
+        guard let match = matches.last else { return nil }
+        
+        let fullRange = match.range(at: 0)
+        let captureRange = match.range(at: 1)
+        let prefix = nsText.substring(with: captureRange).lowercased()
+        
+        let suggestions = commands
+            .filter { $0.hasPrefix("/\(prefix)") }
+            .sorted()
+            .prefix(5)
+        
+        return suggestions.isEmpty ? nil : (Array(suggestions), fullRange)
+    }
+    
+    private func needsArgument(command: String) -> Bool {
+        switch command {
+        case "/who", "/clear":
+            return false
+        default:
+            return true
+        }
+    }
+}

bitchat/Services/BLE/MimeType.swift

@@ -0,0 +1,195 @@
+//
+// MimeType.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import UniformTypeIdentifiers
+
+// MARK: - Extensions for missing UTTypes
+
+extension UTType {
+    static let webP = UTType(importedAs: "image/webp")
+    static let aac  = UTType(importedAs: "audio/aac")
+    static let m4a  = UTType(importedAs: "audio/m4a")
+    static let ogg  = UTType(importedAs: "audio/ogg")
+}
+
+// MARK: - MimeType Enum
+
+enum MimeType: CaseIterable, Hashable {
+    case jpeg
+    case jpg
+    case png
+    case gif
+    case webp
+    case mp4Audio
+    case m4a
+    case aac
+    case mpeg
+    case mp3
+    case wav
+    case xWav
+    case ogg
+    case pdf
+    case octetStream
+
+    var utType: UTType {
+        switch self {
+        case .jpeg, .jpg:   .jpeg
+        case .png:          .png
+        case .gif:          .gif
+        case .webp:         .webP
+        case .aac:          .aac
+        case .m4a:          .m4a
+        case .mp4Audio:     .mpeg4Audio
+        case .mp3, .mpeg:   .mp3
+        case .wav, .xWav:   .wav
+        case .ogg:          .ogg
+        case .pdf:          .pdf
+        case .octetStream:  .data
+        }
+    }
+    
+    var category: Category {
+        switch self {
+        case .jpeg, .jpg, .png, .gif, .webp:
+            return .image
+        case .aac, .m4a, .mp4Audio, .mpeg, .mp3, .wav, .xWav, .ogg:
+            return .audio
+        case .pdf, .octetStream:
+            return .file
+        }
+    }
+
+
+    var mimeString: String {
+        switch self {
+        case .jpeg, .jpg:   "image/jpeg"
+        case .png:          "image/png"
+        case .gif:          "image/gif"
+        case .webp:         "image/webp"
+        case .mp4Audio:     "audio/mp4"
+        case .m4a:          "audio/m4a"
+        case .aac:          "audio/aac"
+        case .mpeg:         "audio/mpeg"
+        case .mp3:          "audio/mp3"
+        case .wav:          "audio/wav"
+        case .xWav:         "audio/x-wav"
+        case .ogg:          "audio/ogg"
+        case .pdf:          "application/pdf"
+        case .octetStream:  "application/octet-stream"
+        }
+    }
+    
+    var defaultExtension: String {
+        switch self {
+        case .jpeg, .jpg:           "jpg"
+        case .png:                  "png"
+        case .webp:                 "webp"
+        case .gif:                  "gif"
+        case .mp4Audio, .m4a, .aac: "m4a"
+        case .mpeg, .mp3:           "mp3"
+        case .wav, .xWav:           "wav"
+        case .ogg:                  "ogg"
+        case .pdf:                  "pdf"
+        case .octetStream:          "bin"
+        }
+    }
+
+    static var allowed: Set<MimeType> = [
+        .jpeg, .jpg, .png, .gif, .webp,
+        .mp4Audio, .m4a, .aac, .mpeg, .mp3,
+        .wav, .xWav, .ogg,
+        .pdf, .octetStream
+    ]
+
+    var isAllowed: Bool {
+        Self.allowed.contains(self)
+    }
+
+    // MARK: - Byte signature validation
+    func matches(data: Data) -> Bool {
+        guard !data.isEmpty else { return false }
+
+        // Generic type → skip validation
+        if self == .octetStream { return true }
+
+        switch self {
+        case .jpeg, .jpg:
+            return data.count >= 3 && data[0] == 0xFF && data[1] == 0xD8 && data[2] == 0xFF
+
+        case .png:
+            return data.count >= 8 &&
+                   data[0] == 0x89 && data[1] == 0x50 && data[2] == 0x4E && data[3] == 0x47 &&
+                   data[4] == 0x0D && data[5] == 0x0A && data[6] == 0x1A && data[7] == 0x0A
+
+        case .gif:
+            return data.count >= 6 && data[0] == 0x47 && data[1] == 0x49 && data[2] == 0x46 &&
+                   data[3] == 0x38 && (data[4] == 0x37 || data[4] == 0x39) && data[5] == 0x61
+
+        case .webp:
+            return data.count >= 12 &&
+                   data[0] == 0x52 && data[1] == 0x49 && data[2] == 0x46 && data[3] == 0x46 &&
+                   data[8] == 0x57 && data[9] == 0x45 && data[10] == 0x42 && data[11] == 0x50
+
+        case .m4a, .mp4Audio, .aac:
+            // AVAudioRecorder output varies by platform - be lenient
+            // Security: size already capped + sandboxed execution
+            return data.count > 100
+
+        case .mpeg, .mp3:
+            if data.count >= 3 && data[0] == 0x49 && data[1] == 0x44 && data[2] == 0x33 {
+                return true // ID3 header
+            }
+            return data.count >= 2 && data[0] == 0xFF && (data[1] & 0xE0) == 0xE0
+
+        case .wav, .xWav:
+            return data.count >= 12 &&
+                   data[0] == 0x52 && data[1] == 0x49 && data[2] == 0x46 && data[3] == 0x46 &&
+                   data[8] == 0x57 && data[9] == 0x41 && data[10] == 0x56 && data[11] == 0x45
+
+        case .ogg:
+            return data.count >= 4 &&
+                   data[0] == 0x4F && data[1] == 0x67 && data[2] == 0x67 && data[3] == 0x53
+
+        case .pdf:
+            return data.count >= 4 &&
+                   data[0] == 0x25 && data[1] == 0x50 && data[2] == 0x44 && data[3] == 0x46
+
+        default:
+            return false
+        }
+    }
+
+    // MARK: - Convenience Initializers
+
+    init?(_ mimeString: String?) {
+        guard let mimeString else { return nil }
+        
+        let normalized = mimeString.lowercased()
+
+        // Direct match with our canonical list
+        if let match = MimeType.allCases.first(where: { $0.mimeString == normalized }) {
+            self = match
+            return
+        }
+
+        // Let UTType normalize aliases like "image/jpg", "audio/x-wav", etc.
+        if let type = UTType(mimeType: normalized),
+           let match = MimeType.allCases.first(where: { type.conforms(to: $0.utType) }) {
+            self = match
+            return
+        }
+
+        return nil
+    }
+}
+
+extension MimeType {
+    enum Category: String {
+        case audio, image, file
+    }
+}

bitchat/Services/CommandProcessor.swift

@@ -0,0 +1,359 @@
+//
+// CommandProcessor.swift
+// bitchat
+//
+// Handles command parsing and execution for BitChat
+// This is free and unencumbered software released into the public domain.
+//
+
+import Foundation
+
+/// Result of command processing
+enum CommandResult {
+    case success(message: String?)
+    case error(message: String)
+    case handled  // Command handled, no message needed
+}
+
+/// Simple struct for geo participant info used by CommandProcessor
+struct CommandGeoParticipant {
+    let id: String        // pubkey hex (lowercased)
+    let displayName: String
+}
+
+/// Protocol defining what CommandProcessor needs from its context.
+/// This breaks the circular dependency between CommandProcessor and ChatViewModel.
+@MainActor
+protocol CommandContextProvider: AnyObject {
+    // MARK: - State Properties
+    var nickname: String { get }
+    var selectedPrivateChatPeer: PeerID? { get }
+    var blockedUsers: Set<String> { get }
+    var privateChats: [PeerID: [BitchatMessage]] { get set }
+    var idBridge: NostrIdentityBridge { get }
+
+    // MARK: - Peer Lookup
+    func getPeerIDForNickname(_ nickname: String) -> PeerID?
+    func getVisibleGeoParticipants() -> [CommandGeoParticipant]
+    func nostrPubkeyForDisplayName(_ displayName: String) -> String?
+
+    // MARK: - Chat Actions
+    func startPrivateChat(with peerID: PeerID)
+    func sendPrivateMessage(_ content: String, to peerID: PeerID)
+    func clearCurrentPublicTimeline()
+    func sendPublicRaw(_ content: String)
+
+    // MARK: - System Messages
+    func addLocalPrivateSystemMessage(_ content: String, to peerID: PeerID)
+    func addPublicSystemMessage(_ content: String)
+
+    // MARK: - Favorites
+    func toggleFavorite(peerID: PeerID)
+    func sendFavoriteNotification(to peerID: PeerID, isFavorite: Bool)
+}
+
+/// Processes chat commands in a focused, efficient way
+@MainActor
+final class CommandProcessor {
+    weak var contextProvider: CommandContextProvider?
+    weak var meshService: Transport?
+    private let identityManager: SecureIdentityStateManagerProtocol
+
+    /// Backward-compatible property for existing code
+    weak var chatViewModel: CommandContextProvider? {
+        get { contextProvider }
+        set { contextProvider = newValue }
+    }
+
+    init(contextProvider: CommandContextProvider? = nil, meshService: Transport? = nil, identityManager: SecureIdentityStateManagerProtocol) {
+        self.contextProvider = contextProvider
+        self.meshService = meshService
+        self.identityManager = identityManager
+    }
+
+    /// Backward-compatible initializer
+    convenience init(chatViewModel: ChatViewModel? = nil, meshService: Transport? = nil, identityManager: SecureIdentityStateManagerProtocol) {
+        self.init(contextProvider: chatViewModel, meshService: meshService, identityManager: identityManager)
+    }
+    
+    /// Process a command string
+    @MainActor
+    func process(_ command: String) -> CommandResult {
+        let parts = command.split(separator: " ", maxSplits: 1, omittingEmptySubsequences: false)
+        guard let cmd = parts.first else { return .error(message: "Invalid command") }
+        let args = parts.count > 1 ? String(parts[1]) : ""
+        
+        // Geohash context: disable favoriting in public geohash or GeoDM
+        let inGeoPublic: Bool = {
+            switch LocationChannelManager.shared.selectedChannel {
+            case .mesh: return false
+            case .location: return true
+            }
+        }()
+        let inGeoDM = contextProvider?.selectedPrivateChatPeer?.isGeoDM == true
+
+        switch cmd {
+        case "/m", "/msg":
+            return handleMessage(args)
+        case "/w", "/who":
+            return handleWho()
+        case "/clear":
+            return handleClear()
+        case "/hug":
+            return handleEmote(args, command: "hug", action: "hugs", emoji: "🫂")
+        case "/slap":
+            return handleEmote(args, command: "slap", action: "slaps", emoji: "🐟", suffix: " around a bit with a large trout")
+        case "/block":
+            return handleBlock(args)
+        case "/unblock":
+            return handleUnblock(args)
+        case "/fav":
+            if inGeoPublic || inGeoDM { return .error(message: "favorites are only for mesh peers in #mesh") }
+            return handleFavorite(args, add: true)
+        case "/unfav":
+            if inGeoPublic || inGeoDM { return .error(message: "favorites are only for mesh peers in #mesh") }
+            return handleFavorite(args, add: false)
+        default:
+            return .error(message: "unknown command: \(cmd)")
+        }
+    }
+
+    // MARK: - Command Handlers
+    
+    private func handleMessage(_ args: String) -> CommandResult {
+        let parts = args.split(separator: " ", maxSplits: 1, omittingEmptySubsequences: false)
+        guard !parts.isEmpty else {
+            return .error(message: "usage: /msg @nickname [message]")
+        }
+        
+        let targetName = String(parts[0])
+        let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
+        
+        guard let peerID = contextProvider?.getPeerIDForNickname(nickname) else {
+            return .error(message: "'\(nickname)' not found")
+        }
+
+        contextProvider?.startPrivateChat(with: peerID)
+
+        if parts.count > 1 {
+            let message = String(parts[1])
+            contextProvider?.sendPrivateMessage(message, to: peerID)
+        }
+        
+        return .success(message: "started private chat with \(nickname)")
+    }
+    
+    private func handleWho() -> CommandResult {
+        // Show geohash participants when in a geohash channel; otherwise mesh peers
+        switch LocationChannelManager.shared.selectedChannel {
+        case .location(let ch):
+            // Geohash context: show visible geohash participants (exclude self)
+            guard let vm = contextProvider else { return .success(message: "nobody around") }
+            let myHex = (try? vm.idBridge.deriveIdentity(forGeohash: ch.geohash))?.publicKeyHex.lowercased()
+            let people = vm.getVisibleGeoParticipants().filter { person in
+                if let me = myHex { return person.id.lowercased() != me }
+                return true
+            }
+            let names = people.map { $0.displayName }
+            if names.isEmpty { return .success(message: "no one else is online right now") }
+            return .success(message: "online: " + names.sorted().joined(separator: ", "))
+        case .mesh:
+            // Mesh context: show connected peer nicknames
+            guard let peers = meshService?.getPeerNicknames(), !peers.isEmpty else {
+                return .success(message: "no one else is online right now")
+            }
+            let onlineList = peers.values.sorted().joined(separator: ", ")
+            return .success(message: "online: \(onlineList)")
+        }
+    }
+    
+    private func handleClear() -> CommandResult {
+        if let peerID = contextProvider?.selectedPrivateChatPeer {
+            contextProvider?.privateChats[peerID]?.removeAll()
+        } else {
+            contextProvider?.clearCurrentPublicTimeline()
+        }
+        return .handled
+    }
+    
+    private func handleEmote(_ args: String, command: String, action: String, emoji: String, suffix: String = "") -> CommandResult {
+        let targetName = args.trimmingCharacters(in: .whitespaces)
+        guard !targetName.isEmpty else {
+            return .error(message: "usage: /\(command) <nickname>")
+        }
+        
+        let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
+        
+        guard let targetPeerID = contextProvider?.getPeerIDForNickname(nickname),
+              let myNickname = contextProvider?.nickname else {
+            return .error(message: "cannot \(command) \(nickname): not found")
+        }
+        
+        let emoteContent = "* \(emoji) \(myNickname) \(action) \(nickname)\(suffix) *"
+        
+        if contextProvider?.selectedPrivateChatPeer != nil {
+            // In private chat
+            if let peerNickname = meshService?.peerNickname(peerID: targetPeerID) {
+                let personalMessage = "* \(emoji) \(myNickname) \(action) you\(suffix) *"
+                meshService?.sendPrivateMessage(personalMessage, to: targetPeerID,
+                                               recipientNickname: peerNickname,
+                                               messageID: UUID().uuidString)
+                // Also add a local system message so the sender sees a natural-language confirmation
+                let pastAction: String = {
+                    switch action {
+                    case "hugs": return "hugged"
+                    case "slaps": return "slapped"
+                    default: return action.hasSuffix("e") ? action + "d" : action + "ed"
+                    }
+                }()
+                let localText = "\(emoji) you \(pastAction) \(nickname)\(suffix)"
+                contextProvider?.addLocalPrivateSystemMessage(localText, to: targetPeerID)
+            }
+        } else {
+            // In public chat: send to active public channel (mesh or geohash)
+            contextProvider?.sendPublicRaw(emoteContent)
+            let publicEcho = "\(emoji) \(myNickname) \(action) \(nickname)\(suffix)"
+            contextProvider?.addPublicSystemMessage(publicEcho)
+        }
+        
+        return .handled
+    }
+    
+    private func handleBlock(_ args: String) -> CommandResult {
+        let targetName = args.trimmingCharacters(in: .whitespaces)
+        
+        if targetName.isEmpty {
+            // List blocked users (mesh) and geohash (Nostr) blocks
+            let meshBlocked = contextProvider?.blockedUsers ?? []
+            var blockedNicknames: [String] = []
+            if let peers = meshService?.getPeerNicknames() {
+                for (peerID, nickname) in peers {
+                    if let fingerprint = meshService?.getFingerprint(for: peerID),
+                       meshBlocked.contains(fingerprint) {
+                        blockedNicknames.append(nickname)
+                    }
+                }
+            }
+
+            // Geohash blocked names (prefer visible display names; fallback to #suffix)
+            let geoBlocked = Array(identityManager.getBlockedNostrPubkeys())
+            var geoNames: [String] = []
+            if let vm = contextProvider {
+                let visible = vm.getVisibleGeoParticipants()
+                let visibleIndex = Dictionary(uniqueKeysWithValues: visible.map { ($0.id.lowercased(), $0.displayName) })
+                for pk in geoBlocked {
+                    if let name = visibleIndex[pk.lowercased()] {
+                        geoNames.append(name)
+                    } else {
+                        let suffix = String(pk.suffix(4))
+                        geoNames.append("anon#\(suffix)")
+                    }
+                }
+            }
+
+            let meshList = blockedNicknames.isEmpty ? "none" : blockedNicknames.sorted().joined(separator: ", ")
+            let geoList = geoNames.isEmpty ? "none" : geoNames.sorted().joined(separator: ", ")
+            return .success(message: "blocked peers: \(meshList) | geohash blocks: \(geoList)")
+        }
+        
+        let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
+        
+        if let peerID = contextProvider?.getPeerIDForNickname(nickname),
+           let fingerprint = meshService?.getFingerprint(for: peerID) {
+            if identityManager.isBlocked(fingerprint: fingerprint) {
+                return .success(message: "\(nickname) is already blocked")
+            }
+            // Block the user (mesh/noise identity)
+            if var identity = identityManager.getSocialIdentity(for: fingerprint) {
+                identity.isBlocked = true
+                identity.isFavorite = false
+                identityManager.updateSocialIdentity(identity)
+            } else {
+                let blockedIdentity = SocialIdentity(
+                    fingerprint: fingerprint,
+                    localPetname: nil,
+                    claimedNickname: nickname,
+                    trustLevel: .unknown,
+                    isFavorite: false,
+                    isBlocked: true,
+                    notes: nil
+                )
+                identityManager.updateSocialIdentity(blockedIdentity)
+            }
+            return .success(message: "blocked \(nickname). you will no longer receive messages from them")
+        }
+        // Mesh lookup failed; try geohash (Nostr) participant by display name
+        if let pub = contextProvider?.nostrPubkeyForDisplayName(nickname) {
+            if identityManager.isNostrBlocked(pubkeyHexLowercased: pub) {
+                return .success(message: "\(nickname) is already blocked")
+            }
+            identityManager.setNostrBlocked(pub, isBlocked: true)
+            return .success(message: "blocked \(nickname) in geohash chats")
+        }
+        
+        return .error(message: "cannot block \(nickname): not found or unable to verify identity")
+    }
+    
+    private func handleUnblock(_ args: String) -> CommandResult {
+        let targetName = args.trimmingCharacters(in: .whitespaces)
+        guard !targetName.isEmpty else {
+            return .error(message: "usage: /unblock <nickname>")
+        }
+        
+        let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
+        
+        if let peerID = contextProvider?.getPeerIDForNickname(nickname),
+           let fingerprint = meshService?.getFingerprint(for: peerID) {
+            if !identityManager.isBlocked(fingerprint: fingerprint) {
+                return .success(message: "\(nickname) is not blocked")
+            }
+            identityManager.setBlocked(fingerprint, isBlocked: false)
+            return .success(message: "unblocked \(nickname)")
+        }
+        // Try geohash unblock
+        if let pub = contextProvider?.nostrPubkeyForDisplayName(nickname) {
+            if !identityManager.isNostrBlocked(pubkeyHexLowercased: pub) {
+                return .success(message: "\(nickname) is not blocked")
+            }
+            identityManager.setNostrBlocked(pub, isBlocked: false)
+            return .success(message: "unblocked \(nickname) in geohash chats")
+        }
+        return .error(message: "cannot unblock \(nickname): not found")
+    }
+    
+    private func handleFavorite(_ args: String, add: Bool) -> CommandResult {
+        let targetName = args.trimmingCharacters(in: .whitespaces)
+        guard !targetName.isEmpty else {
+            return .error(message: "usage: /\(add ? "fav" : "unfav") <nickname>")
+        }
+        
+        let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
+        
+        guard let peerID = contextProvider?.getPeerIDForNickname(nickname),
+              let noisePublicKey = Data(hexString: peerID.id) else {
+            return .error(message: "can't find peer: \(nickname)")
+        }
+        
+        if add {
+            let existingFavorite = FavoritesPersistenceService.shared.getFavoriteStatus(for: noisePublicKey)
+            FavoritesPersistenceService.shared.addFavorite(
+                peerNoisePublicKey: noisePublicKey,
+                peerNostrPublicKey: existingFavorite?.peerNostrPublicKey,
+                peerNickname: nickname
+            )
+            
+            contextProvider?.toggleFavorite(peerID: peerID)
+            contextProvider?.sendFavoriteNotification(to: peerID, isFavorite: true)
+            
+            return .success(message: "added \(nickname) to favorites")
+        } else {
+            FavoritesPersistenceService.shared.removeFavorite(peerNoisePublicKey: noisePublicKey)
+            
+            contextProvider?.toggleFavorite(peerID: peerID)
+            contextProvider?.sendFavoriteNotification(to: peerID, isFavorite: false)
+            
+            return .success(message: "removed \(nickname) from favorites")
+        }
+    }
+    
+}

bitchat/Services/DeliveryTracker.swift

@@ -1,294 +0,0 @@
-//
-// DeliveryTracker.swift
-// bitchat
-//
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-import Combine
-
-class DeliveryTracker {
-    static let shared = DeliveryTracker()
-    
-    // Track pending deliveries
-    private var pendingDeliveries: [String: PendingDelivery] = [:]
-    private let pendingLock = NSLock()
-    
-    // Track received ACKs to prevent duplicates
-    private var receivedAckIDs = Set<String>()
-    private var sentAckIDs = Set<String>()
-    
-    // Timeout configuration
-    private let privateMessageTimeout: TimeInterval = 120  // 2 minutes
-    private let roomMessageTimeout: TimeInterval = 180     // 3 minutes
-    private let favoriteTimeout: TimeInterval = 600       // 10 minutes for favorites
-    
-    // Retry configuration
-    private let maxRetries = 3
-    private let retryDelay: TimeInterval = 5  // Base retry delay
-    
-    // Publishers for UI updates
-    let deliveryStatusUpdated = PassthroughSubject<(messageID: String, status: DeliveryStatus), Never>()
-    
-    // Cleanup timer
-    private var cleanupTimer: Timer?
-    
-    struct PendingDelivery {
-        let messageID: String
-        let sentAt: Date
-        let recipientID: String
-        let recipientNickname: String
-        let retryCount: Int
-        let isFavorite: Bool
-        var timeoutTimer: Timer?
-        
-        var isTimedOut: Bool {
-            let timeout: TimeInterval = isFavorite ? 300 : 30
-            return Date().timeIntervalSince(sentAt) > timeout
-        }
-        
-        var shouldRetry: Bool {
-            return retryCount < 3 && isFavorite
-        }
-    }
-    
-    private init() {
-        startCleanupTimer()
-    }
-    
-    deinit {
-        cleanupTimer?.invalidate()
-    }
-    
-    // MARK: - Public Methods
-    
-    func trackMessage(_ message: BitchatMessage, recipientID: String, recipientNickname: String, isFavorite: Bool = false, expectedRecipients: Int = 1) {
-        // Only track private messages
-        guard message.isPrivate else { return }
-        
-        SecureLogger.log("Tracking message \(message.id) - private: \(message.isPrivate), recipient: \(recipientNickname)", category: SecureLogger.session, level: .info)
-        
-        
-        let delivery = PendingDelivery(
-            messageID: message.id,
-            sentAt: Date(),
-            recipientID: recipientID,
-            recipientNickname: recipientNickname,
-            retryCount: 0,
-            isFavorite: isFavorite,
-            timeoutTimer: nil
-        )
-        
-        // Store the delivery with lock
-        pendingLock.lock()
-        pendingDeliveries[message.id] = delivery
-        pendingLock.unlock()
-        
-        // Update status to sent (only if not already delivered)
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
-            guard let self = self else { return }
-            
-            self.pendingLock.lock()
-            let stillPending = self.pendingDeliveries[message.id] != nil
-            self.pendingLock.unlock()
-            
-            // Only update to sent if still pending (not already delivered)
-            if stillPending {
-                SecureLogger.log("Updating message \(message.id) to sent status (still pending)", category: SecureLogger.session, level: .debug)
-                self.updateDeliveryStatus(message.id, status: .sent)
-            } else {
-                SecureLogger.log("Skipping sent status update for \(message.id) - already delivered", category: SecureLogger.session, level: .debug)
-            }
-        }
-        
-        // Schedule timeout (outside of lock)
-        scheduleTimeout(for: message.id)
-    }
-    
-    func processDeliveryAck(_ ack: DeliveryAck) {
-        pendingLock.lock()
-        defer { pendingLock.unlock() }
-        
-        SecureLogger.log("Processing delivery ACK for message \(ack.originalMessageID) from \(ack.recipientNickname)", category: SecureLogger.session, level: .info)
-        
-        // Prevent duplicate ACK processing
-        guard !receivedAckIDs.contains(ack.ackID) else {
-            SecureLogger.log("Duplicate ACK \(ack.ackID) - ignoring", category: SecureLogger.session, level: .warning)
-            return
-        }
-        receivedAckIDs.insert(ack.ackID)
-        
-        // Find the pending delivery
-        guard let delivery = pendingDeliveries[ack.originalMessageID] else {
-            // Message might have already been delivered or timed out
-            SecureLogger.log("No pending delivery found for message \(ack.originalMessageID)", category: SecureLogger.session, level: .warning)
-            return
-        }
-        
-        // Cancel timeout timer
-        delivery.timeoutTimer?.invalidate()
-        
-        // Direct message - mark as delivered
-        SecureLogger.log("Marking private message \(ack.originalMessageID) as delivered to \(ack.recipientNickname)", category: SecureLogger.session, level: .info)
-        updateDeliveryStatus(ack.originalMessageID, status: .delivered(to: ack.recipientNickname, at: Date()))
-        pendingDeliveries.removeValue(forKey: ack.originalMessageID)
-    }
-    
-    func generateAck(for message: BitchatMessage, myPeerID: String, myNickname: String, hopCount: UInt8) -> DeliveryAck? {
-        // Don't ACK our own messages
-        guard message.senderPeerID != myPeerID else { 
-            return nil 
-        }
-        
-        // Only ACK private messages
-        guard message.isPrivate else { 
-            return nil 
-        }
-        
-        // Don't ACK if we've already sent an ACK for this message
-        guard !sentAckIDs.contains(message.id) else { 
-            return nil 
-        }
-        sentAckIDs.insert(message.id)
-        
-        
-        return DeliveryAck(
-            originalMessageID: message.id,
-            recipientID: myPeerID,
-            recipientNickname: myNickname,
-            hopCount: hopCount
-        )
-    }
-    
-    func clearDeliveryStatus(for messageID: String) {
-        pendingLock.lock()
-        defer { pendingLock.unlock() }
-        
-        if let delivery = pendingDeliveries[messageID] {
-            delivery.timeoutTimer?.invalidate()
-        }
-        pendingDeliveries.removeValue(forKey: messageID)
-    }
-    
-    // MARK: - Private Methods
-    
-    private func updateDeliveryStatus(_ messageID: String, status: DeliveryStatus) {
-        SecureLogger.log("Updating delivery status for message \(messageID): \(status)", category: SecureLogger.session, level: .debug)
-        DispatchQueue.main.async { [weak self] in
-            self?.deliveryStatusUpdated.send((messageID: messageID, status: status))
-        }
-    }
-    
-    private func scheduleTimeout(for messageID: String) {
-        // Get delivery info with lock
-        pendingLock.lock()
-        guard let delivery = pendingDeliveries[messageID] else {
-            pendingLock.unlock()
-            return
-        }
-        let isFavorite = delivery.isFavorite
-        pendingLock.unlock()
-        
-        let timeout = isFavorite ? favoriteTimeout : privateMessageTimeout
-        
-        let timer = Timer.scheduledTimer(withTimeInterval: timeout, repeats: false) { [weak self] _ in
-            self?.handleTimeout(messageID: messageID)
-        }
-        
-        pendingLock.lock()
-        if var updatedDelivery = pendingDeliveries[messageID] {
-            updatedDelivery.timeoutTimer = timer
-            pendingDeliveries[messageID] = updatedDelivery
-        }
-        pendingLock.unlock()
-    }
-    
-    private func handleTimeout(messageID: String) {
-        pendingLock.lock()
-        guard let delivery = pendingDeliveries[messageID] else {
-            pendingLock.unlock()
-            return
-        }
-        
-        let shouldRetry = delivery.shouldRetry
-        
-        if shouldRetry {
-            pendingLock.unlock()
-            // Retry for favorites (outside of lock)
-            retryDelivery(messageID: messageID)
-        } else {
-            // Mark as failed
-            let reason = "Message not delivered"
-            pendingDeliveries.removeValue(forKey: messageID)
-            pendingLock.unlock()
-            updateDeliveryStatus(messageID, status: .failed(reason: reason))
-        }
-    }
-    
-    private func retryDelivery(messageID: String) {
-        pendingLock.lock()
-        guard let delivery = pendingDeliveries[messageID] else {
-            pendingLock.unlock()
-            return
-        }
-        
-        // Increment retry count
-        let newDelivery = PendingDelivery(
-            messageID: delivery.messageID,
-            sentAt: delivery.sentAt,
-            recipientID: delivery.recipientID,
-            recipientNickname: delivery.recipientNickname,
-            retryCount: delivery.retryCount + 1,
-            isFavorite: delivery.isFavorite,
-            timeoutTimer: nil
-        )
-        
-        pendingDeliveries[messageID] = newDelivery
-        let retryCount = delivery.retryCount
-        pendingLock.unlock()
-        
-        // Exponential backoff for retry
-        let delay = retryDelay * pow(2, Double(retryCount))
-        
-        DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
-            // Trigger resend through delegate or notification
-            NotificationCenter.default.post(
-                name: Notification.Name("bitchat.retryMessage"),
-                object: nil,
-                userInfo: ["messageID": messageID]
-            )
-            
-            // Schedule new timeout
-            self?.scheduleTimeout(for: messageID)
-        }
-    }
-    
-    private func startCleanupTimer() {
-        cleanupTimer = Timer.scheduledTimer(withTimeInterval: 60, repeats: true) { [weak self] _ in
-            self?.cleanupOldDeliveries()
-        }
-    }
-    
-    private func cleanupOldDeliveries() {
-        pendingLock.lock()
-        defer { pendingLock.unlock() }
-        
-        let now = Date()
-        let maxAge: TimeInterval = 3600  // 1 hour
-        
-        // Clean up old pending deliveries
-        pendingDeliveries = pendingDeliveries.filter { (_, delivery) in
-            now.timeIntervalSince(delivery.sentAt) < maxAge
-        }
-        
-        // Clean up old ACK IDs (keep last 1000)
-        if receivedAckIDs.count > 1000 {
-            receivedAckIDs.removeAll()
-        }
-        if sentAckIDs.count > 1000 {
-            sentAckIDs.removeAll()
-        }
-    }
-}

bitchat/Services/FavoritesPersistenceService.swift

@@ -1,9 +1,10 @@
+import BitLogger
 import Foundation
 import Combine
 
 /// Manages persistent favorite relationships between peers
 @MainActor
-class FavoritesPersistenceService: ObservableObject {
+final class FavoritesPersistenceService: ObservableObject {
     
     struct FavoriteRelationship: Codable {
         let peerNoisePublicKey: Data
@@ -13,14 +14,19 @@ class FavoritesPersistenceService: ObservableObject {
         let theyFavoritedUs: Bool
         let favoritedAt: Date
         let lastUpdated: Date
+        // Track what we last sent as OUR npub to this peer, to avoid resending unless it changes
+        // Note: we do not track which npub we last sent to them; sending happens only on favorite toggle
         
         var isMutual: Bool {
             isFavorite && theyFavoritedUs
         }
     }
     
+    // We intentionally do not track when we last sent our npub; sending happens only on favorite toggle.
+
     private static let storageKey = "chat.bitchat.favorites"
     private static let keychainService = "chat.bitchat.favorites"
+    private let keychain: KeychainHelperProtocol
     
     @Published private(set) var favorites: [Data: FavoriteRelationship] = [:] // Noise pubkey -> relationship
     @Published private(set) var mutualFavorites: Set<Data> = []
@@ -30,7 +36,8 @@ class FavoritesPersistenceService: ObservableObject {
     
     static let shared = FavoritesPersistenceService()
     
-    private init() {
+    init(keychain: KeychainHelperProtocol = KeychainHelper()) {
+        self.keychain = keychain
         loadFavorites()
         
         // Update mutual favorites when favorites change
@@ -47,8 +54,7 @@ class FavoritesPersistenceService: ObservableObject {
         peerNostrPublicKey: String? = nil,
         peerNickname: String
     ) {
-        SecureLogger.log("⭐️ Adding favorite: \(peerNickname) (\(peerNoisePublicKey.hexEncodedString()))", 
-                        category: SecureLogger.session, level: .info)
+        SecureLogger.info("⭐️ Adding favorite: \(peerNickname) (\(peerNoisePublicKey.hexEncodedString()))", category: .session)
         
         let existing = favorites[peerNoisePublicKey]
         
@@ -64,8 +70,7 @@ class FavoritesPersistenceService: ObservableObject {
         
         // Log if this creates a mutual favorite
         if relationship.isMutual {
-            SecureLogger.log("💕 Mutual favorite relationship established with \(peerNickname)!", 
-                            category: SecureLogger.session, level: .info)
+            SecureLogger.info("💕 Mutual favorite relationship established with \(peerNickname)!", category: .session)
         }
         
         favorites[peerNoisePublicKey] = relationship
@@ -83,8 +88,7 @@ class FavoritesPersistenceService: ObservableObject {
     func removeFavorite(peerNoisePublicKey: Data) {
         guard let existing = favorites[peerNoisePublicKey] else { return }
         
-        SecureLogger.log("⭐️ Removing favorite: \(existing.peerNickname) (\(peerNoisePublicKey.hexEncodedString()))", 
-                        category: SecureLogger.session, level: .info)
+        SecureLogger.info("⭐️ Removing favorite: \(existing.peerNickname) (\(peerNoisePublicKey.hexEncodedString()))", category: .session)
         
         // If they still favorite us, keep the record but mark us as not favoriting
         if existing.theyFavoritedUs {
@@ -125,8 +129,7 @@ class FavoritesPersistenceService: ObservableObject {
         let existing = favorites[peerNoisePublicKey]
         let displayName = peerNickname ?? existing?.peerNickname ?? "Unknown"
         
-        SecureLogger.log("📨 Received favorite notification: \(displayName) \(favorited ? "favorited" : "unfavorited") us", 
-                        category: SecureLogger.session, level: .info)
+        SecureLogger.info("📨 Received favorite notification: \(displayName) \(favorited ? "favorited" : "unfavorited") us", category: .session)
         
         let relationship = FavoriteRelationship(
             peerNoisePublicKey: peerNoisePublicKey,
@@ -147,8 +150,7 @@ class FavoritesPersistenceService: ObservableObject {
             
             // Check if this creates a mutual favorite
             if relationship.isMutual {
-                SecureLogger.log("💕 Mutual favorite relationship established with \(displayName)!", 
-                                category: SecureLogger.session, level: .info)
+                SecureLogger.info("💕 Mutual favorite relationship established with \(displayName)!", category: .session)
             }
         }
         
@@ -176,127 +178,27 @@ class FavoritesPersistenceService: ObservableObject {
     func getFavoriteStatus(for peerNoisePublicKey: Data) -> FavoriteRelationship? {
         favorites[peerNoisePublicKey]
     }
-    
-    /// Update Nostr public key for a peer
-    func updateNostrPublicKey(for peerNoisePublicKey: Data, nostrPubkey: String) {
-        guard let existing = favorites[peerNoisePublicKey] else { return }
-        
-        let updated = FavoriteRelationship(
-            peerNoisePublicKey: existing.peerNoisePublicKey,
-            peerNostrPublicKey: nostrPubkey,
-            peerNickname: existing.peerNickname,
-            isFavorite: existing.isFavorite,
-            theyFavoritedUs: existing.theyFavoritedUs,
-            favoritedAt: existing.favoritedAt,
-            lastUpdated: Date()
-        )
-        
-        favorites[peerNoisePublicKey] = updated
-        saveFavorites()
-    }
-    
-    /// Update nickname for an existing favorite
-    func updateNickname(for peerNoisePublicKey: Data, newNickname: String) {
-        guard let existing = favorites[peerNoisePublicKey] else { return }
-        
-        // Skip if nickname hasn't changed
-        if existing.peerNickname == newNickname { return }
-        
-        // Updating nickname for favorite
-        
-        let updated = FavoriteRelationship(
-            peerNoisePublicKey: existing.peerNoisePublicKey,
-            peerNostrPublicKey: existing.peerNostrPublicKey,
-            peerNickname: newNickname,
-            isFavorite: existing.isFavorite,
-            theyFavoritedUs: existing.theyFavoritedUs,
-            favoritedAt: existing.favoritedAt,
-            lastUpdated: Date()
-        )
-        
-        favorites[peerNoisePublicKey] = updated
-        saveFavorites()
-        
-        // Notify observers
-        NotificationCenter.default.post(
-            name: .favoriteStatusChanged,
-            object: nil,
-            userInfo: ["peerPublicKey": peerNoisePublicKey]
-        )
-    }
-    
-    /// Update noise public key when peer reconnects with new ID
-    func updateNoisePublicKey(from oldKey: Data, to newKey: Data, peerNickname: String) {
-        guard let existing = favorites[oldKey] else { 
-            SecureLogger.log("⚠️ Cannot update noise key - no favorite found for \(oldKey.hexEncodedString())", 
-                            category: SecureLogger.session, level: .warning)
-            return 
+
+    /// Resolve favorite status by short peer ID (16-hex derived from Noise pubkey)
+    /// Falls back to scanning favorites and matching on derived peer ID.
+    func getFavoriteStatus(forPeerID peerID: PeerID) -> FavoriteRelationship? {
+        // Quick sanity: peerID should be 16 hex chars (8 bytes)
+        guard peerID.isShort else { return nil }
+        for (pubkey, rel) in favorites where PeerID(publicKey: pubkey) == peerID {
+            return rel
         }
-        
-        // Check if we already have a favorite with the new key
-        if favorites[newKey] != nil {
-            SecureLogger.log("⚠️ Favorite already exists with new key \(newKey.hexEncodedString()), removing old entry", 
-                            category: SecureLogger.session, level: .warning)
-            favorites.removeValue(forKey: oldKey)
-            saveFavorites()
-            return
-        }
-        
-        // Updating noise public key
-        
-        // Remove old entry
-        favorites.removeValue(forKey: oldKey)
-        
-        // Add with new key
-        let updated = FavoriteRelationship(
-            peerNoisePublicKey: newKey,
-            peerNostrPublicKey: existing.peerNostrPublicKey,
-            peerNickname: peerNickname,
-            isFavorite: existing.isFavorite,
-            theyFavoritedUs: existing.theyFavoritedUs,
-            favoritedAt: existing.favoritedAt,
-            lastUpdated: Date()
-        )
-        
-        favorites[newKey] = updated
-        saveFavorites()
-        
-        // Notify observers with both old and new keys
-        NotificationCenter.default.post(
-            name: .favoriteStatusChanged,
-            object: nil,
-            userInfo: [
-                "peerPublicKey": newKey,
-                "oldPeerPublicKey": oldKey,
-                "isKeyUpdate": true
-            ]
-        )
-    }
-    
-    /// Get all favorites (including non-mutual)
-    func getAllFavorites() -> [FavoriteRelationship] {
-        favorites.values.filter { $0.isFavorite }
-    }
-    
-    /// Get only mutual favorites
-    func getMutualFavorites() -> [FavoriteRelationship] {
-        favorites.values.filter { $0.isMutual }
-    }
-    
-    /// Get all favorite relationships (including where they favorited us)
-    func getAllRelationships() -> [FavoriteRelationship] {
-        Array(favorites.values)
+        return nil
     }
     
     /// Clear all favorites - used for panic mode
     func clearAllFavorites() {
-        SecureLogger.log("🧹 Clearing all favorites (panic mode)", category: SecureLogger.session, level: .warning)
+        SecureLogger.warning("🧹 Clearing all favorites (panic mode)", category: .session)
         
         favorites.removeAll()
         saveFavorites()
         
         // Delete from keychain directly
-        KeychainHelper.delete(
+        keychain.delete(
             key: Self.storageKey,
             service: Self.keychainService
         )
@@ -316,26 +218,26 @@ class FavoritesPersistenceService: ObservableObject {
             let data = try encoder.encode(relationships)
             
             // Store in keychain for security
-            KeychainHelper.save(
+            keychain.save(
                 key: Self.storageKey,
                 data: data,
-                service: Self.keychainService
+                service: Self.keychainService,
+                accessible: nil
             )
             
             // Successfully saved favorites
         } catch {
-            SecureLogger.log("Failed to save favorites: \(error)", category: SecureLogger.session, level: .error)
+            SecureLogger.error("Failed to save favorites: \(error)", category: .session)
         }
     }
     
     private func loadFavorites() {
         // Loading favorites from keychain
         
-        guard let data = KeychainHelper.load(
+        guard let data = keychain.load(
             key: Self.storageKey,
             service: Self.keychainService
         ) else { 
-            SecureLogger.log("📭 No existing favorites found in keychain", category: SecureLogger.session, level: .info)
             return 
         }
         
@@ -343,14 +245,12 @@ class FavoritesPersistenceService: ObservableObject {
             let decoder = JSONDecoder()
             let relationships = try decoder.decode([FavoriteRelationship].self, from: data)
             
-            SecureLogger.log("✅ Loaded \(relationships.count) favorite relationships", 
-                            category: SecureLogger.session, level: .info)
+            SecureLogger.info("✅ Loaded \(relationships.count) favorite relationships", category: .session)
             
             // Log Nostr public key info
             for relationship in relationships {
                 if relationship.peerNostrPublicKey == nil {
-                    SecureLogger.log("⚠️ No Nostr public key stored for '\(relationship.peerNickname)'", 
-                                    category: SecureLogger.session, level: .warning)
+                    SecureLogger.warning("⚠️ No Nostr public key stored for '\(relationship.peerNickname)'", category: .session)
                 }
             }
             
@@ -361,8 +261,7 @@ class FavoritesPersistenceService: ObservableObject {
             for relationship in relationships {
                 // Check for duplicates by public key (the actual unique identifier)
                 if let existing = seenPublicKeys[relationship.peerNoisePublicKey] {
-                    SecureLogger.log("⚠️ Duplicate favorite found for public key \(relationship.peerNoisePublicKey.hexEncodedString()) - nicknames: '\(existing.peerNickname)' vs '\(relationship.peerNickname)'", 
-                                    category: SecureLogger.session, level: .warning)
+                    SecureLogger.warning("⚠️ Duplicate favorite found for public key \(relationship.peerNoisePublicKey.hexEncodedString()) - nicknames: '\(existing.peerNickname)' vs '\(relationship.peerNickname)'", category: .session)
                     
                     // Keep the most recent or most complete relationship
                     if relationship.lastUpdated > existing.lastUpdated ||
@@ -403,7 +302,7 @@ class FavoritesPersistenceService: ObservableObject {
             // Log loaded relationships
             // Loaded relationships successfully
         } catch {
-            SecureLogger.log("Failed to load favorites: \(error)", category: SecureLogger.session, level: .error)
+            SecureLogger.error("Failed to load favorites: \(error)", category: .session)
         }
     }
 }

bitchat/Services/GeohashParticipantTracker.swift

@@ -0,0 +1,159 @@
+//
+// GeohashParticipantTracker.swift
+// bitchat
+//
+// Tracks participants in geohash-based location channels.
+// This is free and unencumbered software released into the public domain.
+//
+
+import Foundation
+
+/// Represents a participant in a geohash channel
+public struct GeoPerson: Identifiable, Equatable, Sendable {
+    public let id: String        // pubkey hex (lowercased)
+    public let displayName: String
+    public let lastSeen: Date
+
+    public init(id: String, displayName: String, lastSeen: Date) {
+        self.id = id
+        self.displayName = displayName
+        self.lastSeen = lastSeen
+    }
+}
+
+/// Protocol for resolving display names and checking block status
+@MainActor
+public protocol GeohashParticipantContext: AnyObject {
+    /// Returns display name for a Nostr pubkey (e.g., "alice#a1b2" or "anon#c3d4")
+    func displayNameForPubkey(_ pubkeyHex: String) -> String
+    /// Returns true if the pubkey is blocked
+    func isBlocked(_ pubkeyHexLowercased: String) -> Bool
+}
+
+/// Tracks participants across multiple geohash channels
+@MainActor
+public final class GeohashParticipantTracker: ObservableObject {
+
+    /// Activity cutoff duration (defaults to 5 minutes)
+    public let activityCutoff: TimeInterval
+
+    /// Per-geohash participant map: [geohash: [pubkeyHex: lastSeen]]
+    private var participants: [String: [String: Date]] = [:]
+
+    /// Currently visible people for the active geohash
+    @Published public private(set) var visiblePeople: [GeoPerson] = []
+
+    /// The currently active geohash (if any)
+    private var activeGeohash: String?
+
+    /// Context for display name resolution and block checking
+    private weak var context: GeohashParticipantContext?
+
+    /// Timer for periodic refresh
+    private var refreshTimer: Timer?
+
+    public init(activityCutoff: TimeInterval = -300) { // default 5 minutes
+        self.activityCutoff = activityCutoff
+    }
+
+    /// Configure with a context provider
+    public func configure(context: GeohashParticipantContext) {
+        self.context = context
+    }
+
+    /// Set the currently active geohash
+    public func setActiveGeohash(_ geohash: String?) {
+        activeGeohash = geohash
+        if geohash == nil {
+            visiblePeople = []
+        } else {
+            refresh()
+        }
+    }
+
+    /// Record activity from a participant in the current active geohash
+    public func recordParticipant(pubkeyHex: String) {
+        guard let gh = activeGeohash else { return }
+        recordParticipant(pubkeyHex: pubkeyHex, geohash: gh)
+    }
+
+    /// Record activity from a participant in a specific geohash
+    public func recordParticipant(pubkeyHex: String, geohash: String) {
+        let key = pubkeyHex.lowercased()
+        var map = participants[geohash] ?? [:]
+        map[key] = Date()
+        participants[geohash] = map
+
+        // Only refresh visible list if this geohash is currently active
+        if activeGeohash == geohash {
+            refresh()
+        }
+    }
+
+    /// Remove a participant from all geohashes (used when blocking)
+    public func removeParticipant(pubkeyHex: String) {
+        let key = pubkeyHex.lowercased()
+        for (gh, var map) in participants {
+            map.removeValue(forKey: key)
+            participants[gh] = map
+        }
+        refresh()
+    }
+
+    /// Get participant count for a specific geohash
+    public func participantCount(for geohash: String) -> Int {
+        let cutoff = Date().addingTimeInterval(activityCutoff)
+        let map = participants[geohash] ?? [:]
+        return map.values.filter { $0 >= cutoff }.count
+    }
+
+    /// Get the visible people list for the active geohash (read-only query)
+    public func getVisiblePeople() -> [GeoPerson] {
+        guard let gh = activeGeohash, let context = context else { return [] }
+        let cutoff = Date().addingTimeInterval(activityCutoff)
+        let map = (participants[gh] ?? [:])
+            .filter { $0.value >= cutoff }
+            .filter { !context.isBlocked($0.key) }
+
+        return map
+            .map { (pub, seen) in
+                GeoPerson(id: pub, displayName: context.displayNameForPubkey(pub), lastSeen: seen)
+            }
+            .sorted { $0.lastSeen > $1.lastSeen }
+    }
+
+    /// Refresh the visible people list
+    public func refresh() {
+        visiblePeople = getVisiblePeople()
+    }
+
+    /// Start the periodic refresh timer
+    public func startRefreshTimer(interval: TimeInterval = 30.0) {
+        stopRefreshTimer()
+        refreshTimer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
+            Task { @MainActor in
+                self?.refresh()
+            }
+        }
+    }
+
+    /// Stop the periodic refresh timer
+    public func stopRefreshTimer() {
+        refreshTimer?.invalidate()
+        refreshTimer = nil
+    }
+
+    /// Clear all participant data
+    public func clear() {
+        participants.removeAll()
+        visiblePeople = []
+    }
+
+    /// Clear participant data for a specific geohash
+    public func clear(geohash: String) {
+        participants.removeValue(forKey: geohash)
+        if activeGeohash == geohash {
+            visiblePeople = []
+        }
+    }
+}

bitchat/Services/KeychainManager.swift

@@ -6,101 +6,33 @@
 // For more information, see <https://unlicense.org>
 //
 
+import BitLogger
 import Foundation
 import Security
-import os.log
 
-class KeychainManager {
-    static let shared = KeychainManager()
+protocol KeychainManagerProtocol {
+    func saveIdentityKey(_ keyData: Data, forKey key: String) -> Bool
+    func getIdentityKey(forKey key: String) -> Data?
+    func deleteIdentityKey(forKey key: String) -> Bool
+    func deleteAllKeychainData() -> Bool
     
+    func secureClear(_ data: inout Data)
+    func secureClear(_ string: inout String)
+    
+    func verifyIdentityKeyExists() -> Bool
+}
+
+final class KeychainManager: KeychainManagerProtocol {
     // Use consistent service name for all keychain items
-    private let service = "chat.bitchat"
-    private let appGroup = "group.chat.bitchat"
-    
-    private init() {
-        // Clean up legacy keychain items on first run
-        cleanupLegacyKeychainItems()
-    }
-    
-    private func cleanupLegacyKeychainItems() {
-        // Check if we've already done cleanup
-        let cleanupKey = "bitchat.keychain.cleanup.v2"
-        if UserDefaults.standard.bool(forKey: cleanupKey) {
-            return
-        }
-        
-        
-        // List of old service names to migrate from
-        let legacyServices = [
-            "com.bitchat.passwords",
-            "com.bitchat.deviceidentity",
-            "com.bitchat.noise.identity",
-            "chat.bitchat.passwords",
-            "bitchat.keychain"
-        ]
-        
-        var migratedItems = 0
-        
-        // Try to migrate identity keys
-        for oldService in legacyServices {
-            // Check for noise identity key
-            let query: [String: Any] = [
-                kSecClass as String: kSecClassGenericPassword,
-                kSecAttrService as String: oldService,
-                kSecAttrAccount as String: "identity_noiseStaticKey",
-                kSecReturnData as String: true
-            ]
-            
-            var result: AnyObject?
-            let status = SecItemCopyMatching(query as CFDictionary, &result)
-            
-            if status == errSecSuccess, let data = result as? Data {
-                // Save to new service
-                if saveIdentityKey(data, forKey: "noiseStaticKey") {
-                    migratedItems += 1
-                    SecureLogger.logKeyOperation("migrate", keyType: "noiseStaticKey", success: true)
-                }
-                // Delete from old service
-                let deleteQuery: [String: Any] = [
-                    kSecClass as String: kSecClassGenericPassword,
-                    kSecAttrService as String: oldService,
-                    kSecAttrAccount as String: "identity_noiseStaticKey"
-                ]
-                SecItemDelete(deleteQuery as CFDictionary)
-            }
-        }
-        
-        // Clean up all other legacy items
-        for oldService in legacyServices {
-            let deleteQuery: [String: Any] = [
-                kSecClass as String: kSecClassGenericPassword,
-                kSecAttrService as String: oldService
-            ]
-            
-            SecItemDelete(deleteQuery as CFDictionary)
-        }
-        
-        
-        // Mark cleanup as done
-        UserDefaults.standard.set(true, forKey: cleanupKey)
-    }
-    
-    
-    private func isSandboxed() -> Bool {
-        #if os(macOS)
-        let environment = ProcessInfo.processInfo.environment
-        return environment["APP_SANDBOX_CONTAINER_ID"] != nil
-        #else
-        return false
-        #endif
-    }
+    private let service = BitchatApp.bundleID
+    private let appGroup = "group.\(BitchatApp.bundleID)"
     
     // MARK: - Identity Keys
     
     func saveIdentityKey(_ keyData: Data, forKey key: String) -> Bool {
         let fullKey = "identity_\(key)"
         let result = saveData(keyData, forKey: fullKey)
-        SecureLogger.logKeyOperation("save", keyType: key, success: result)
+        SecureLogger.logKeyOperation(.save, keyType: key, success: result)
         return result
     }
     
@@ -111,7 +43,7 @@ class KeychainManager {
     
     func deleteIdentityKey(forKey key: String) -> Bool {
         let result = delete(forKey: "identity_\(key)")
-        SecureLogger.logKeyOperation("delete", keyType: key, success: result)
+        SecureLogger.logKeyOperation(.delete, keyType: key, success: result)
         return result
     }
     
@@ -126,39 +58,44 @@ class KeychainManager {
         // Delete any existing item first to ensure clean state
         _ = delete(forKey: key)
         
-        // Build query with all necessary attributes for sandboxed apps
-        var query: [String: Any] = [
+        // Build base query
+        var base: [String: Any] = [
             kSecClass as String: kSecClassGenericPassword,
             kSecAttrAccount as String: key,
             kSecValueData as String: data,
             kSecAttrService as String: service,
-            // Important for sandboxed apps: make it accessible when unlocked
-            kSecAttrAccessible as String: kSecAttrAccessibleWhenUnlocked
+            kSecAttrAccessible as String: kSecAttrAccessibleWhenUnlocked,
+            kSecAttrLabel as String: "bitchat-\(key)"
         ]
-        
-        // Add a label for easier debugging
-        query[kSecAttrLabel as String] = "bitchat-\(key)"
-        
-        // For sandboxed apps, use the app group for sharing between app instances
-        if isSandboxed() {
-            query[kSecAttrAccessGroup as String] = appGroup
-        }
-        
-        // For sandboxed macOS apps, we need to ensure the item is NOT synchronized
         #if os(macOS)
-        query[kSecAttrSynchronizable as String] = false
+        base[kSecAttrSynchronizable as String] = false
         #endif
-        
-        let status = SecItemAdd(query as CFDictionary, nil)
-        
-        if status == errSecSuccess {
-            return true
-        } else if status == -34018 {
-            SecureLogger.logError(NSError(domain: "Keychain", code: -34018), context: "Missing keychain entitlement", category: SecureLogger.keychain)
+
+        // Try with access group where it is expected to work (iOS app builds)
+        var triedWithoutGroup = false
+        func attempt(addAccessGroup: Bool) -> OSStatus {
+            var query = base
+            if addAccessGroup { query[kSecAttrAccessGroup as String] = appGroup }
+            return SecItemAdd(query as CFDictionary, nil)
+        }
+
+        #if os(iOS)
+        var status = attempt(addAccessGroup: true)
+        if status == -34018 { // Missing entitlement, retry without access group
+            triedWithoutGroup = true
+            status = attempt(addAccessGroup: false)
+        }
+        #else
+        // On macOS dev/simulator default to no access group to avoid -34018
+        let status = attempt(addAccessGroup: false)
+        #endif
+
+        if status == errSecSuccess { return true }
+        if status == -34018 && !triedWithoutGroup {
+            SecureLogger.error(NSError(domain: "Keychain", code: -34018), context: "Missing keychain entitlement", category: .keychain)
         } else if status != errSecDuplicateItem {
-            SecureLogger.logError(NSError(domain: "Keychain", code: Int(status)), context: "Error saving to keychain", category: SecureLogger.keychain)
+            SecureLogger.error(NSError(domain: "Keychain", code: Int(status)), context: "Error saving to keychain", category: .keychain)
         }
-        
         return false
     }
     
@@ -168,45 +105,56 @@ class KeychainManager {
     }
     
     private func retrieveData(forKey key: String) -> Data? {
-        var query: [String: Any] = [
+        // Base query
+        let base: [String: Any] = [
             kSecClass as String: kSecClassGenericPassword,
             kSecAttrAccount as String: key,
             kSecAttrService as String: service,
             kSecReturnData as String: true,
             kSecMatchLimit as String: kSecMatchLimitOne
         ]
-        
-        // For sandboxed apps, use the app group
-        if isSandboxed() {
-            query[kSecAttrAccessGroup as String] = appGroup
-        }
-        
+
         var result: AnyObject?
-        let status = SecItemCopyMatching(query as CFDictionary, &result)
-        
-        if status == errSecSuccess {
-            return result as? Data
-        } else if status == -34018 {
-            SecureLogger.logError(NSError(domain: "Keychain", code: -34018), context: "Missing keychain entitlement", category: SecureLogger.keychain)
+        func attempt(withAccessGroup: Bool) -> OSStatus {
+            var q = base
+            if withAccessGroup { q[kSecAttrAccessGroup as String] = appGroup }
+            return SecItemCopyMatching(q as CFDictionary, &result)
+        }
+
+        #if os(iOS)
+        var status = attempt(withAccessGroup: true)
+        if status == -34018 { status = attempt(withAccessGroup: false) }
+        #else
+        let status = attempt(withAccessGroup: false)
+        #endif
+
+        if status == errSecSuccess { return result as? Data }
+        if status == -34018 {
+            SecureLogger.error(NSError(domain: "Keychain", code: -34018), context: "Missing keychain entitlement", category: .keychain)
         }
-        
         return nil
     }
     
     private func delete(forKey key: String) -> Bool {
-        // Build basic query
-        var query: [String: Any] = [
+        // Base delete query
+        let base: [String: Any] = [
             kSecClass as String: kSecClassGenericPassword,
             kSecAttrAccount as String: key,
             kSecAttrService as String: service
         ]
-        
-        // For sandboxed apps, use the app group
-        if isSandboxed() {
-            query[kSecAttrAccessGroup as String] = appGroup
+
+        func attempt(withAccessGroup: Bool) -> OSStatus {
+            var q = base
+            if withAccessGroup { q[kSecAttrAccessGroup as String] = appGroup }
+            return SecItemDelete(q as CFDictionary)
         }
-        
-        let status = SecItemDelete(query as CFDictionary)
+
+        #if os(iOS)
+        var status = attempt(withAccessGroup: true)
+        if status == -34018 { status = attempt(withAccessGroup: false) }
+        #else
+        let status = attempt(withAccessGroup: false)
+        #endif
         return status == errSecSuccess || status == errSecItemNotFound
     }
     
@@ -226,15 +174,10 @@ class KeychainManager {
         return status == errSecSuccess || status == errSecItemNotFound
     }
     
-    // Force cleanup to run again (for development/testing)
-    func resetCleanupFlag() {
-        UserDefaults.standard.removeObject(forKey: "bitchat.keychain.cleanup.v2")
-    }
-    
     
     // Delete ALL keychain data for panic mode
     func deleteAllKeychainData() -> Bool {
-        SecureLogger.log("Panic mode - deleting all keychain data", category: SecureLogger.security, level: .warning)
+        SecureLogger.warning("Panic mode - deleting all keychain data", category: .security)
         
         var totalDeleted = 0
         
@@ -253,10 +196,25 @@ class KeychainManager {
                 var shouldDelete = false
                 let account = item[kSecAttrAccount as String] as? String ?? ""
                 let service = item[kSecAttrService as String] as? String ?? ""
+                let accessGroup = item[kSecAttrAccessGroup as String] as? String
                 
-                // ONLY delete if service name contains "bitchat"
-                // This is the safest approach - we only touch items we know are ours
-                if service.lowercased().contains("bitchat") {
+                // More precise deletion criteria:
+                // 1. Check for our specific app group
+                // 2. OR check for our exact service name
+                // 3. OR check for known legacy service names
+                if accessGroup == appGroup {
+                    shouldDelete = true
+                } else if service == self.service {
+                    shouldDelete = true
+                } else if [
+                    "com.bitchat.passwords",
+                    "com.bitchat.deviceidentity",
+                    "com.bitchat.noise.identity",
+                    "chat.bitchat.passwords",
+                    "bitchat.keychain",
+                    "bitchat",
+                    "com.bitchat"
+                ].contains(service) {
                     shouldDelete = true
                 }
                 
@@ -282,19 +240,21 @@ class KeychainManager {
                     let deleteStatus = SecItemDelete(deleteQuery as CFDictionary)
                     if deleteStatus == errSecSuccess {
                         totalDeleted += 1
-                        SecureLogger.log("Deleted keychain item: \(account) from \(service)", category: SecureLogger.keychain, level: .info)
+                        SecureLogger.info("Deleted keychain item: \(account) from \(service)", category: .keychain)
                     }
                 }
             }
         }
         
-        // Also try to delete by known service names (in case we missed any)
+        // Also try to delete by known service names and app group
+        // This catches any items that might have been missed above
         let knownServices = [
-            "chat.bitchat",
+            self.service,  // Current service name
             "com.bitchat.passwords",
             "com.bitchat.deviceidentity", 
             "com.bitchat.noise.identity",
             "chat.bitchat.passwords",
+            "chat.bitchat.nostr",
             "bitchat.keychain",
             "bitchat",
             "com.bitchat"
@@ -312,87 +272,46 @@ class KeychainManager {
             }
         }
         
-        SecureLogger.log("Panic mode cleanup completed. Total items deleted: \(totalDeleted)", category: SecureLogger.keychain, level: .warning)
+        // Also delete by app group to ensure complete cleanup
+        let groupQuery: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccessGroup as String: appGroup
+        ]
+        
+        let groupStatus = SecItemDelete(groupQuery as CFDictionary)
+        if groupStatus == errSecSuccess {
+            totalDeleted += 1
+        }
+        
+        SecureLogger.warning("Panic mode cleanup completed. Total items deleted: \(totalDeleted)", category: .keychain)
         
         return totalDeleted > 0
     }
     
+    // MARK: - Security Utilities
+    
+    /// Securely clear sensitive data from memory
+    func secureClear(_ data: inout Data) {
+        _ = data.withUnsafeMutableBytes { bytes in
+            // Use volatile memset to prevent compiler optimization
+            memset_s(bytes.baseAddress, bytes.count, 0, bytes.count)
+        }
+        data = Data() // Clear the data object
+    }
+    
+    /// Securely clear sensitive string from memory
+    func secureClear(_ string: inout String) {
+        // Convert to mutable data and clear
+        if var data = string.data(using: .utf8) {
+            secureClear(&data)
+        }
+        string = "" // Clear the string object
+    }
+    
     // MARK: - Debug
     
     func verifyIdentityKeyExists() -> Bool {
         let key = "identity_noiseStaticKey"
         return retrieveData(forKey: key) != nil
     }
-    
-    // Aggressive cleanup for legacy items - can be called manually
-    func aggressiveCleanupLegacyItems() -> Int {
-        var deletedCount = 0
-        
-        // List of KNOWN bitchat service names from our development history
-        let knownBitchatServices = [
-            "com.bitchat.passwords",
-            "com.bitchat.deviceidentity",
-            "com.bitchat.noise.identity",
-            "chat.bitchat.passwords",
-            "bitchat.keychain",
-            "Bitchat",
-            "BitChat"
-        ]
-        
-        // First, delete all items from known legacy services
-        for legacyService in knownBitchatServices {
-            let deleteQuery: [String: Any] = [
-                kSecClass as String: kSecClassGenericPassword,
-                kSecAttrService as String: legacyService
-            ]
-            
-            let status = SecItemDelete(deleteQuery as CFDictionary)
-            if status == errSecSuccess {
-                deletedCount += 1
-            }
-        }
-        
-        // Now search for items that have our specific account patterns with bitchat service names
-        let searchQuery: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecMatchLimit as String: kSecMatchLimitAll,
-            kSecReturnAttributes as String: true
-        ]
-        
-        var result: AnyObject?
-        let status = SecItemCopyMatching(searchQuery as CFDictionary, &result)
-        
-        if status == errSecSuccess, let items = result as? [[String: Any]] {
-            for item in items {
-                let account = item[kSecAttrAccount as String] as? String ?? ""
-                let service = item[kSecAttrService as String] as? String ?? ""
-                
-                // ONLY delete if service name contains "bitchat" somewhere
-                // This ensures we never touch other apps' keychain items
-                var shouldDelete = false
-                
-                // Check if service contains "bitchat" (case insensitive) but NOT our current service
-                let serviceLower = service.lowercased()
-                if service != self.service && serviceLower.contains("bitchat") {
-                    shouldDelete = true
-                }
-                
-                if shouldDelete {
-                    // Build precise delete query
-                    let deleteQuery: [String: Any] = [
-                        kSecClass as String: kSecClassGenericPassword,
-                        kSecAttrService as String: service,
-                        kSecAttrAccount as String: account
-                    ]
-                    
-                    let deleteStatus = SecItemDelete(deleteQuery as CFDictionary)
-                    if deleteStatus == errSecSuccess {
-                        deletedCount += 1
-                    }
-                }
-            }
-        }
-        
-        return deletedCount
-    }
-}
+}

bitchat/Services/LocationNotesManager.swift

@@ -0,0 +1,257 @@
+import BitLogger
+import Foundation
+
+/// Dependencies for location notes, allowing tests to stub relay/identity behavior.
+struct LocationNotesDependencies {
+    typealias RelayLookup = @MainActor (_ geohash: String, _ count: Int) -> [String]
+    typealias Subscribe = @MainActor (_ filter: NostrFilter, _ id: String, _ relays: [String], _ handler: @escaping (NostrEvent) -> Void, _ onEOSE: (() -> Void)?) -> Void
+    typealias Unsubscribe = @MainActor (_ id: String) -> Void
+    typealias SendEvent = @MainActor (_ event: NostrEvent, _ relayUrls: [String]) -> Void
+
+    var relayLookup: RelayLookup
+    var subscribe: Subscribe
+    var unsubscribe: Unsubscribe
+    var sendEvent: SendEvent
+    var deriveIdentity: (_ geohash: String) throws -> NostrIdentity
+    var now: () -> Date
+    
+    private static let idBridge = NostrIdentityBridge()
+
+    static let live = LocationNotesDependencies(
+        relayLookup: { geohash, count in
+            GeoRelayDirectory.shared.closestRelays(toGeohash: geohash, count: count)
+        },
+        subscribe: { filter, id, relays, handler, onEOSE in
+            NostrRelayManager.shared.subscribe(
+                filter: filter,
+                id: id,
+                relayUrls: relays,
+                handler: handler,
+                onEOSE: onEOSE
+            )
+        },
+        unsubscribe: { id in
+            NostrRelayManager.shared.unsubscribe(id: id)
+        },
+        sendEvent: { event, relays in
+            NostrRelayManager.shared.sendEvent(event, to: relays)
+        },
+        deriveIdentity: { geohash in
+            try idBridge.deriveIdentity(forGeohash: geohash)
+        },
+        now: { Date() }
+    )
+}
+
+/// Persistent location notes (Nostr kind 1) scoped to a building-level geohash (precision 8).
+/// Subscribes to and publishes notes for a given geohash and provides a send API.
+@MainActor
+final class LocationNotesManager: ObservableObject {
+    enum State: Equatable {
+        case idle
+        case loading
+        case ready
+        case noRelays
+    }
+
+    struct Note: Identifiable, Equatable {
+        let id: String
+        let pubkey: String
+        let content: String
+        let createdAt: Date
+        let nickname: String?
+
+        var displayName: String {
+            let suffix = String(pubkey.suffix(4))
+            if let nick = nickname, !nick.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+                return "\(nick)#\(suffix)"
+            }
+            return "anon#\(suffix)"
+        }
+    }
+
+    @Published private(set) var notes: [Note] = [] // reverse-chron sorted
+    @Published private(set) var geohash: String
+    @Published private(set) var initialLoadComplete: Bool = false
+    @Published private(set) var state: State = .loading
+    @Published private(set) var errorMessage: String?
+    private var subscriptionID: String?
+    private var noteIDs = Set<String>() // O(1) duplicate detection
+    private let dependencies: LocationNotesDependencies
+    private let maxNotesInMemory = 500 // Defensive cap (relay limit is 200)
+
+    private enum Strings {
+        static let noRelays = String(localized: "location_notes.error.no_relays", comment: "Shown when no geo relays are available near the selected location")
+
+        static func failedToSend(_ detail: String) -> String {
+            String(
+                format: String(localized: "location_notes.error.failed_to_send", comment: "Shown when a location note fails to send"),
+                locale: .current,
+                detail
+            )
+        }
+    }
+
+    init(geohash: String, dependencies: LocationNotesDependencies = .live) {
+        let norm = geohash.lowercased()
+        self.geohash = norm
+        self.dependencies = dependencies
+        // Validate geohash (building-level precision: 8 chars)
+        if !Geohash.isValidBuildingGeohash(norm) {
+            SecureLogger.warning("LocationNotesManager: invalid geohash '\(norm)' (expected 8 valid base32 chars)", category: .session)
+        }
+        subscribe()
+    }
+
+    func setGeohash(_ newGeohash: String) {
+        let norm = newGeohash.lowercased()
+        guard norm != geohash else { return }
+        // Validate geohash (building-level precision: 8 chars)
+        guard Geohash.isValidBuildingGeohash(norm) else {
+            SecureLogger.warning("LocationNotesManager: rejecting invalid geohash '\(norm)' (expected 8 valid base32 chars)", category: .session)
+            return
+        }
+        if let sub = subscriptionID {
+            dependencies.unsubscribe(sub)
+            subscriptionID = nil
+        }
+        // Set loading state before clearing to prevent empty state flicker
+        state = .loading
+        initialLoadComplete = false
+        errorMessage = nil
+        geohash = norm
+        notes.removeAll()
+        noteIDs.removeAll()
+        subscribe()
+    }
+
+    func refresh() {
+        if let sub = subscriptionID {
+            dependencies.unsubscribe(sub)
+            subscriptionID = nil
+        }
+        // Set loading state before clearing to prevent empty state flicker
+        state = .loading
+        initialLoadComplete = false
+        errorMessage = nil
+        notes.removeAll()
+        noteIDs.removeAll()
+        subscribe()
+    }
+
+    func clearError() {
+        errorMessage = nil
+    }
+
+    private func subscribe() {
+        state = .loading
+        errorMessage = nil
+        if let sub = subscriptionID {
+            dependencies.unsubscribe(sub)
+            subscriptionID = nil
+        }
+        let subID = "locnotes-\(geohash)-\(UUID().uuidString.prefix(8))"
+        let relays = dependencies.relayLookup(geohash, TransportConfig.nostrGeoRelayCount)
+        guard !relays.isEmpty else {
+            subscriptionID = nil
+            initialLoadComplete = true
+            state = .noRelays
+            errorMessage = Strings.noRelays
+            SecureLogger.warning("LocationNotesManager: no geo relays for geohash=\(geohash)", category: .session)
+            return
+        }
+
+        subscriptionID = subID
+        initialLoadComplete = false
+
+        // Subscribe to center + 8 neighbors (± 1 grid)
+        let neighbors = Geohash.neighbors(of: geohash)
+        let allGeohashes = [geohash] + neighbors
+        let filter = NostrFilter.geohashNotes(allGeohashes, since: nil, limit: 200)
+
+        // Build a set of valid geohashes for tag matching (includes all 9 cells)
+        let validGeohashes = Set(allGeohashes.map { $0.lowercased() })
+
+        dependencies.subscribe(filter, subID, relays, { [weak self] event in
+            guard let self = self else { return }
+            guard event.kind == NostrProtocol.EventKind.textNote.rawValue else { return }
+            // Ensure matching tag - accept any of our 9 geohashes
+            guard event.tags.contains(where: { tag in
+                tag.count >= 2 && tag[0].lowercased() == "g" && validGeohashes.contains(tag[1].lowercased())
+            }) else { return }
+            guard !self.noteIDs.contains(event.id) else { return }
+            self.noteIDs.insert(event.id)
+            let nick = event.tags.first(where: { $0.first?.lowercased() == "n" && $0.count >= 2 })?.dropFirst().first
+            let ts = Date(timeIntervalSince1970: TimeInterval(event.created_at))
+            let note = Note(id: event.id, pubkey: event.pubkey, content: event.content, createdAt: ts, nickname: nick)
+            self.notes.append(note)
+            self.notes.sort { $0.createdAt > $1.createdAt }
+            self.enforceMemoryCap()
+            self.state = .ready
+        }, { [weak self] in
+            guard let self = self else { return }
+            self.initialLoadComplete = true
+            if self.state != .noRelays {
+                self.state = .ready
+            }
+        })
+    }
+
+    /// Send a location note for the current geohash using the per-geohash identity.
+    func send(content: String, nickname: String) {
+        let trimmed = content.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !trimmed.isEmpty else { return }
+        let relays = dependencies.relayLookup(geohash, TransportConfig.nostrGeoRelayCount)
+        guard !relays.isEmpty else {
+            state = .noRelays
+            errorMessage = Strings.noRelays
+            SecureLogger.warning("LocationNotesManager: send blocked, no geo relays for geohash=\(geohash)", category: .session)
+            return
+        }
+        do {
+            let id = try dependencies.deriveIdentity(geohash)
+            let event = try NostrProtocol.createGeohashTextNote(
+                content: trimmed,
+                geohash: geohash,
+                senderIdentity: id,
+                nickname: nickname
+            )
+            dependencies.sendEvent(event, relays)
+            // Optimistic local-echo
+            let echo = Note(
+                id: event.id,
+                pubkey: id.publicKeyHex,
+                content: trimmed,
+                createdAt: Date(timeIntervalSince1970: TimeInterval(event.created_at)),
+                nickname: nickname
+            )
+            self.noteIDs.insert(event.id)
+            self.notes.insert(echo, at: 0)
+            self.enforceMemoryCap()
+            self.state = .ready
+            self.errorMessage = nil
+        } catch {
+            SecureLogger.error("LocationNotesManager: failed to send note: \(error)", category: .session)
+            errorMessage = Strings.failedToSend(error.localizedDescription)
+        }
+    }
+
+    /// Enforces defensive memory cap on notes array (keeps newest).
+    private func enforceMemoryCap() {
+        if notes.count > maxNotesInMemory {
+            let removed = notes.count - maxNotesInMemory
+            notes = Array(notes.prefix(maxNotesInMemory))
+            SecureLogger.debug("LocationNotesManager: trimmed \(removed) old notes (cap: \(maxNotesInMemory))", category: .session)
+        }
+    }
+
+    /// Explicitly cancel subscription and release resources.
+    func cancel() {
+        if let sub = subscriptionID {
+            dependencies.unsubscribe(sub)
+            subscriptionID = nil
+        }
+        state = .idle
+        errorMessage = nil
+    }
+}

bitchat/Services/LocationStateManager.swift

@@ -0,0 +1,545 @@
+import BitLogger
+import Foundation
+import Combine
+
+#if os(iOS) || os(macOS)
+import CoreLocation
+
+/// Unified manager for location-based channel state including:
+/// - CoreLocation permissions and one-shot location retrieval
+/// - Geohash channel computation from coordinates
+/// - Channel selection and teleport state
+/// - Bookmark persistence and friendly name resolution
+///
+/// Consolidates LocationChannelManager + GeohashBookmarksStore into a single source of truth.
+final class LocationStateManager: NSObject, CLLocationManagerDelegate, ObservableObject {
+    static let shared = LocationStateManager()
+
+    // MARK: - Permission State
+
+    enum PermissionState: Equatable {
+        case notDetermined
+        case denied
+        case restricted
+        case authorized
+    }
+
+    // MARK: - Private Properties (CoreLocation)
+
+    private let cl = CLLocationManager()
+    private let geocoder = CLGeocoder()
+    private var lastLocation: CLLocation?
+    private var refreshTimer: Timer?
+    private var isGeocoding: Bool = false
+
+    // MARK: - Persistence Keys
+
+    private let selectedChannelKey = "locationChannel.selected"
+    private let teleportedStoreKey = "locationChannel.teleportedSet"
+    private let bookmarksKey = "locationChannel.bookmarks"
+    private let bookmarkNamesKey = "locationChannel.bookmarkNames"
+
+    // MARK: - Published State (Channel)
+
+    @Published private(set) var permissionState: PermissionState = .notDetermined
+    @Published private(set) var availableChannels: [GeohashChannel] = []
+    @Published private(set) var selectedChannel: ChannelID = .mesh
+    @Published var teleported: Bool = false
+    @Published private(set) var locationNames: [GeohashChannelLevel: String] = [:]
+
+    // MARK: - Published State (Bookmarks)
+
+    @Published private(set) var bookmarks: [String] = []
+    @Published private(set) var bookmarkNames: [String: String] = [:]
+
+    // MARK: - Private State
+
+    private var teleportedSet: Set<String> = []
+    private var bookmarkMembership: Set<String> = []
+    private var resolvingNames: Set<String> = []
+    private let storage: UserDefaults
+
+    /// Returns true if running in test environment
+    private static var isRunningTests: Bool {
+        let env = ProcessInfo.processInfo.environment
+        return NSClassFromString("XCTestCase") != nil ||
+               env["XCTestConfigurationFilePath"] != nil ||
+               env["XCTestBundlePath"] != nil ||
+               env["GITHUB_ACTIONS"] != nil ||
+               env["CI"] != nil
+    }
+
+    // MARK: - Initialization
+
+    private override init() {
+        self.storage = .standard
+        super.init()
+
+        // Skip CoreLocation setup in test environments
+        guard !Self.isRunningTests else {
+            loadPersistedState()
+            return
+        }
+
+        cl.delegate = self
+        cl.desiredAccuracy = kCLLocationAccuracyHundredMeters
+        cl.distanceFilter = TransportConfig.locationDistanceFilterMeters
+
+        loadPersistedState()
+        initializePermissionState()
+    }
+
+    /// Internal initializer for testing with custom storage
+    init(storage: UserDefaults) {
+        self.storage = storage
+        super.init()
+        loadPersistedState()
+    }
+
+    private func loadPersistedState() {
+        // Load selected channel
+        if let data = storage.data(forKey: selectedChannelKey),
+           let channel = try? JSONDecoder().decode(ChannelID.self, from: data) {
+            selectedChannel = channel
+        }
+
+        // Load teleported set
+        if let data = storage.data(forKey: teleportedStoreKey),
+           let arr = try? JSONDecoder().decode([String].self, from: data) {
+            teleportedSet = Set(arr)
+        }
+
+        // Load bookmarks
+        if let data = storage.data(forKey: bookmarksKey),
+           let arr = try? JSONDecoder().decode([String].self, from: data) {
+            var seen = Set<String>()
+            var list: [String] = []
+            for raw in arr {
+                let gh = Self.normalizeGeohash(raw)
+                guard !gh.isEmpty, !seen.contains(gh) else { continue }
+                seen.insert(gh)
+                list.append(gh)
+            }
+            bookmarks = list
+            bookmarkMembership = seen
+        }
+
+        // Load bookmark names
+        if let data = storage.data(forKey: bookmarkNamesKey),
+           let dict = try? JSONDecoder().decode([String: String].self, from: data) {
+            bookmarkNames = dict
+        }
+    }
+
+    private func initializePermissionState() {
+        let status: CLAuthorizationStatus
+        if #available(iOS 14.0, macOS 11.0, *) {
+            status = cl.authorizationStatus
+        } else {
+            status = CLLocationManager.authorizationStatus()
+        }
+        updatePermissionState(from: status)
+
+        // Fall back to persisted teleport state if no location authorization
+        switch status {
+        case .authorizedAlways, .authorizedWhenInUse, .authorized:
+            break
+        case .notDetermined, .restricted, .denied:
+            fallthrough
+        @unknown default:
+            if case .location(let ch) = selectedChannel {
+                teleported = teleportedSet.contains(ch.geohash)
+            }
+        }
+    }
+
+    // MARK: - Public API (Permissions & Location)
+
+    func enableLocationChannels() {
+        let status: CLAuthorizationStatus
+        if #available(iOS 14.0, macOS 11.0, *) {
+            status = cl.authorizationStatus
+        } else {
+            status = CLLocationManager.authorizationStatus()
+        }
+        switch status {
+        case .notDetermined:
+            cl.requestWhenInUseAuthorization()
+        case .restricted:
+            Task { @MainActor in self.permissionState = .restricted }
+        case .denied:
+            Task { @MainActor in self.permissionState = .denied }
+        case .authorizedAlways, .authorizedWhenInUse, .authorized:
+            Task { @MainActor in self.permissionState = .authorized }
+            requestOneShotLocation()
+        @unknown default:
+            Task { @MainActor in self.permissionState = .restricted }
+        }
+    }
+
+    func refreshChannels() {
+        if permissionState == .authorized {
+            requestOneShotLocation()
+        }
+    }
+
+    func beginLiveRefresh(interval: TimeInterval = TransportConfig.locationLiveRefreshInterval) {
+        guard permissionState == .authorized else { return }
+        refreshTimer?.invalidate()
+        refreshTimer = nil
+        cl.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
+        cl.distanceFilter = TransportConfig.locationDistanceFilterLiveMeters
+        cl.startUpdatingLocation()
+        requestOneShotLocation()
+    }
+
+    func endLiveRefresh() {
+        refreshTimer?.invalidate()
+        refreshTimer = nil
+        cl.stopUpdatingLocation()
+        cl.desiredAccuracy = kCLLocationAccuracyHundredMeters
+        cl.distanceFilter = TransportConfig.locationDistanceFilterMeters
+    }
+
+    // MARK: - Public API (Channel Selection)
+
+    func select(_ channel: ChannelID) {
+        Task { @MainActor in
+            self.selectedChannel = channel
+            if let data = try? JSONEncoder().encode(channel) {
+                self.storage.set(data, forKey: self.selectedChannelKey)
+            }
+
+            switch channel {
+            case .mesh:
+                self.teleported = false
+            case .location(let ch):
+                let inRegional = self.availableChannels.contains { $0.geohash == ch.geohash }
+                if inRegional {
+                    self.teleported = false
+                    if self.teleportedSet.contains(ch.geohash) {
+                        self.teleportedSet.remove(ch.geohash)
+                        self.persistTeleportedSet()
+                    }
+                } else {
+                    self.teleported = self.teleportedSet.contains(ch.geohash)
+                }
+            }
+        }
+    }
+
+    func markTeleported(for geohash: String, _ flag: Bool) {
+        if flag {
+            teleportedSet.insert(geohash)
+        } else {
+            teleportedSet.remove(geohash)
+        }
+        persistTeleportedSet()
+        if case .location(let ch) = selectedChannel, ch.geohash == geohash {
+            Task { @MainActor in self.teleported = flag }
+        }
+    }
+
+    // MARK: - Public API (Bookmarks)
+
+    func isBookmarked(_ geohash: String) -> Bool {
+        bookmarkMembership.contains(Self.normalizeGeohash(geohash))
+    }
+
+    func toggleBookmark(_ geohash: String) {
+        let gh = Self.normalizeGeohash(geohash)
+        if bookmarkMembership.contains(gh) {
+            removeBookmark(gh)
+        } else {
+            addBookmark(gh)
+        }
+    }
+
+    func addBookmark(_ geohash: String) {
+        let gh = Self.normalizeGeohash(geohash)
+        guard !gh.isEmpty, !bookmarkMembership.contains(gh) else { return }
+        bookmarks.insert(gh, at: 0)
+        bookmarkMembership.insert(gh)
+        persistBookmarks()
+        resolveBookmarkNameIfNeeded(for: gh)
+    }
+
+    func removeBookmark(_ geohash: String) {
+        let gh = Self.normalizeGeohash(geohash)
+        guard bookmarkMembership.contains(gh) else { return }
+        if let idx = bookmarks.firstIndex(of: gh) {
+            bookmarks.remove(at: idx)
+        }
+        bookmarkMembership.remove(gh)
+        if bookmarkNames.removeValue(forKey: gh) != nil {
+            persistBookmarkNames()
+        }
+        persistBookmarks()
+    }
+
+    // MARK: - CLLocationManagerDelegate
+
+    private func requestOneShotLocation() {
+        cl.requestLocation()
+    }
+
+    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
+        updatePermissionState(from: status)
+        if case .authorized = permissionState {
+            requestOneShotLocation()
+        }
+    }
+
+    @available(iOS 14.0, macOS 11.0, *)
+    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
+        updatePermissionState(from: manager.authorizationStatus)
+        if case .authorized = permissionState {
+            requestOneShotLocation()
+        }
+    }
+
+    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
+        guard let loc = locations.last else { return }
+        lastLocation = loc
+        computeChannels(from: loc.coordinate)
+        reverseGeocodeLocation(loc)
+    }
+
+    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
+        SecureLogger.error("LocationStateManager: location error: \(error.localizedDescription)", category: .session)
+    }
+
+    // MARK: - Private Helpers (Permission)
+
+    private func updatePermissionState(from status: CLAuthorizationStatus) {
+        let newState: PermissionState
+        switch status {
+        case .notDetermined: newState = .notDetermined
+        case .restricted: newState = .restricted
+        case .denied: newState = .denied
+        case .authorizedAlways, .authorizedWhenInUse, .authorized: newState = .authorized
+        @unknown default: newState = .restricted
+        }
+        Task { @MainActor in self.permissionState = newState }
+    }
+
+    // MARK: - Private Helpers (Channel Computation)
+
+    private func computeChannels(from coord: CLLocationCoordinate2D) {
+        let levels = GeohashChannelLevel.allCases
+        var result: [GeohashChannel] = []
+        for level in levels {
+            let gh = Geohash.encode(latitude: coord.latitude, longitude: coord.longitude, precision: level.precision)
+            result.append(GeohashChannel(level: level, geohash: gh))
+        }
+        Task { @MainActor in
+            self.availableChannels = result
+            switch self.selectedChannel {
+            case .mesh:
+                self.teleported = false
+            case .location(let ch):
+                let inRegional = result.contains { $0.geohash == ch.geohash }
+                if inRegional {
+                    self.teleported = false
+                    if self.teleportedSet.contains(ch.geohash) {
+                        self.teleportedSet.remove(ch.geohash)
+                        self.persistTeleportedSet()
+                    }
+                } else {
+                    self.teleported = true
+                }
+            }
+        }
+    }
+
+    // MARK: - Private Helpers (Geocoding)
+
+    private func reverseGeocodeLocation(_ location: CLLocation) {
+        geocoder.cancelGeocode()
+        isGeocoding = true
+        geocoder.reverseGeocodeLocation(location) { [weak self] placemarks, _ in
+            guard let self = self else { return }
+            self.isGeocoding = false
+            if let pm = placemarks?.first {
+                let names = self.locationNamesByLevel(from: pm)
+                Task { @MainActor in self.locationNames = names }
+            }
+        }
+    }
+
+    private func locationNamesByLevel(from pm: CLPlacemark) -> [GeohashChannelLevel: String] {
+        var dict: [GeohashChannelLevel: String] = [:]
+        if let country = pm.country, !country.isEmpty {
+            dict[.region] = country
+        }
+        if let admin = pm.administrativeArea, !admin.isEmpty {
+            dict[.province] = admin
+        } else if let subAdmin = pm.subAdministrativeArea, !subAdmin.isEmpty {
+            dict[.province] = subAdmin
+        }
+        if let locality = pm.locality, !locality.isEmpty {
+            dict[.city] = locality
+        } else if let subAdmin = pm.subAdministrativeArea, !subAdmin.isEmpty {
+            dict[.city] = subAdmin
+        } else if let admin = pm.administrativeArea, !admin.isEmpty {
+            dict[.city] = admin
+        }
+        if let subLocality = pm.subLocality, !subLocality.isEmpty {
+            dict[.neighborhood] = subLocality
+        } else if let locality = pm.locality, !locality.isEmpty {
+            dict[.neighborhood] = locality
+        }
+        if let subLocality = pm.subLocality, !subLocality.isEmpty {
+            dict[.block] = subLocality
+        } else if let locality = pm.locality, !locality.isEmpty {
+            dict[.block] = locality
+        }
+        if let name = pm.name, !name.isEmpty {
+            dict[.building] = name
+        } else if let thoroughfare = pm.thoroughfare, !thoroughfare.isEmpty {
+            dict[.building] = thoroughfare
+        }
+        return dict
+    }
+
+    func resolveBookmarkNameIfNeeded(for geohash: String) {
+        let gh = Self.normalizeGeohash(geohash)
+        guard !gh.isEmpty, bookmarkNames[gh] == nil, !resolvingNames.contains(gh) else { return }
+        resolvingNames.insert(gh)
+
+        if gh.count <= 2 {
+            let b = Geohash.decodeBounds(gh)
+            let pts: [CLLocation] = [
+                CLLocation(latitude: (b.latMin + b.latMax) / 2, longitude: (b.lonMin + b.lonMax) / 2),
+                CLLocation(latitude: b.latMin, longitude: b.lonMin),
+                CLLocation(latitude: b.latMin, longitude: b.lonMax),
+                CLLocation(latitude: b.latMax, longitude: b.lonMin),
+                CLLocation(latitude: b.latMax, longitude: b.lonMax)
+            ]
+            resolveCompositeAdminName(geohash: gh, points: pts)
+        } else {
+            let center = Geohash.decodeCenter(gh)
+            let loc = CLLocation(latitude: center.lat, longitude: center.lon)
+            geocoder.reverseGeocodeLocation(loc) { [weak self] placemarks, _ in
+                guard let self = self else { return }
+                defer { self.resolvingNames.remove(gh) }
+                if let pm = placemarks?.first,
+                   let name = Self.nameForGeohashLength(gh.count, from: pm),
+                   !name.isEmpty {
+                    DispatchQueue.main.async {
+                        self.bookmarkNames[gh] = name
+                        self.persistBookmarkNames()
+                    }
+                }
+            }
+        }
+    }
+
+    private func resolveCompositeAdminName(geohash gh: String, points: [CLLocation]) {
+        var uniqueAdmins: [String] = []
+        var seenAdmins = Set<String>()
+        var idx = 0
+
+        func step() {
+            if idx >= points.count {
+                let finalName: String? = {
+                    if uniqueAdmins.count >= 2 { return uniqueAdmins[0] + " and " + uniqueAdmins[1] }
+                    return uniqueAdmins.first
+                }()
+                if let finalName = finalName, !finalName.isEmpty {
+                    DispatchQueue.main.async {
+                        self.bookmarkNames[gh] = finalName
+                        self.persistBookmarkNames()
+                    }
+                }
+                self.resolvingNames.remove(gh)
+                return
+            }
+            let loc = points[idx]
+            idx += 1
+            geocoder.reverseGeocodeLocation(loc) { [weak self] placemarks, _ in
+                guard self != nil else { return }
+                if let pm = placemarks?.first {
+                    if let admin = pm.administrativeArea, !admin.isEmpty, !seenAdmins.contains(admin) {
+                        seenAdmins.insert(admin)
+                        uniqueAdmins.append(admin)
+                    } else if let country = pm.country, !country.isEmpty, !seenAdmins.contains(country) {
+                        seenAdmins.insert(country)
+                        uniqueAdmins.append(country)
+                    }
+                }
+                step()
+            }
+        }
+        step()
+    }
+
+    private static func nameForGeohashLength(_ len: Int, from pm: CLPlacemark) -> String? {
+        switch len {
+        case 0...2:
+            return pm.administrativeArea ?? pm.country
+        case 3...4:
+            return pm.administrativeArea ?? pm.subAdministrativeArea ?? pm.country
+        case 5:
+            return pm.locality ?? pm.subAdministrativeArea ?? pm.administrativeArea
+        case 6...7:
+            return pm.subLocality ?? pm.locality ?? pm.administrativeArea
+        default:
+            return pm.subLocality ?? pm.locality ?? pm.administrativeArea ?? pm.country
+        }
+    }
+
+    // MARK: - Private Helpers (Persistence)
+
+    private func persistTeleportedSet() {
+        if let data = try? JSONEncoder().encode(Array(teleportedSet)) {
+            storage.set(data, forKey: teleportedStoreKey)
+        }
+    }
+
+    private func persistBookmarks() {
+        if let data = try? JSONEncoder().encode(bookmarks) {
+            storage.set(data, forKey: bookmarksKey)
+        }
+    }
+
+    private func persistBookmarkNames() {
+        if let data = try? JSONEncoder().encode(bookmarkNames) {
+            storage.set(data, forKey: bookmarkNamesKey)
+        }
+    }
+
+    private static func normalizeGeohash(_ s: String) -> String {
+        let allowed = Set("0123456789bcdefghjkmnpqrstuvwxyz")
+        return s
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+            .lowercased()
+            .replacingOccurrences(of: "#", with: "")
+            .filter { allowed.contains($0) }
+    }
+}
+
+// MARK: - Backward Compatibility Typealiases
+
+typealias LocationChannelManager = LocationStateManager
+typealias GeohashBookmarksStore = LocationStateManager
+
+// MARK: - Backward Compatibility Extensions
+
+extension LocationStateManager {
+    /// Backward compatibility: toggle bookmark (was GeohashBookmarksStore.toggle)
+    func toggle(_ geohash: String) {
+        toggleBookmark(geohash)
+    }
+
+    /// Backward compatibility: add bookmark (was GeohashBookmarksStore.add)
+    func add(_ geohash: String) {
+        addBookmark(geohash)
+    }
+
+    /// Backward compatibility: remove bookmark (was GeohashBookmarksStore.remove)
+    func remove(_ geohash: String) {
+        removeBookmark(geohash)
+    }
+}
+#endif

bitchat/Services/MeshTopologyTracker.swift

@@ -0,0 +1,120 @@
+import Foundation
+
+/// Tracks observed mesh topology and computes hop-by-hop routes.
+final class MeshTopologyTracker {
+    private typealias RoutingID = Data
+
+    private let queue = DispatchQueue(label: "mesh.topology", attributes: .concurrent)
+    private let hopSize = 8
+    private var adjacency: [RoutingID: Set<RoutingID>] = [:]
+
+    func reset() {
+        queue.sync(flags: .barrier) {
+            self.adjacency.removeAll()
+        }
+    }
+
+    func recordDirectLink(between a: Data?, and b: Data?) {
+        guard let left = sanitize(a), let right = sanitize(b), left != right else { return }
+        queue.sync(flags: .barrier) {
+            var setA = self.adjacency[left] ?? []
+            setA.insert(right)
+            self.adjacency[left] = setA
+
+            var setB = self.adjacency[right] ?? []
+            setB.insert(left)
+            self.adjacency[right] = setB
+        }
+    }
+
+    func removeDirectLink(between a: Data?, and b: Data?) {
+        guard let left = sanitize(a), let right = sanitize(b), left != right else { return }
+        queue.sync(flags: .barrier) {
+            if var setA = self.adjacency[left] {
+                setA.remove(right)
+                self.adjacency[left] = setA.isEmpty ? nil : setA
+            }
+            if var setB = self.adjacency[right] {
+                setB.remove(left)
+                self.adjacency[right] = setB.isEmpty ? nil : setB
+            }
+        }
+    }
+
+    func removePeer(_ data: Data?) {
+        guard let peer = sanitize(data) else { return }
+        queue.sync(flags: .barrier) {
+            guard let neighbors = self.adjacency.removeValue(forKey: peer) else { return }
+            for neighbor in neighbors {
+                if var set = self.adjacency[neighbor] {
+                    set.remove(peer)
+                    self.adjacency[neighbor] = set.isEmpty ? nil : set
+                }
+            }
+        }
+    }
+
+    func recordRoute(_ hops: [Data]) {
+        let sanitized = hops.compactMap { sanitize($0) }
+        guard sanitized.count >= 2 else { return }
+        queue.sync(flags: .barrier) {
+            for idx in 0..<(sanitized.count - 1) {
+                let left = sanitized[idx]
+                let right = sanitized[idx + 1]
+                guard left != right else { continue }
+
+                var setA = self.adjacency[left] ?? []
+                setA.insert(right)
+                self.adjacency[left] = setA
+
+                var setB = self.adjacency[right] ?? []
+                setB.insert(left)
+                self.adjacency[right] = setB
+            }
+        }
+    }
+
+    func computeRoute(from start: Data?, to goal: Data?, maxHops: Int = 255) -> [Data]? {
+        guard let source = sanitize(start), let target = sanitize(goal) else { return nil }
+        if source == target { return [source] }
+
+        let graph = queue.sync { adjacency }
+        guard graph[source] != nil, graph[target] != nil else { return nil }
+
+        var visited: Set<RoutingID> = [source]
+        var queuePaths: [[RoutingID]] = [[source]]
+        var index = 0
+
+        while index < queuePaths.count {
+            let path = queuePaths[index]
+            index += 1
+            guard path.count <= maxHops else { continue }
+            guard let last = path.last, let neighbors = graph[last] else { continue }
+
+            for neighbor in neighbors {
+                if visited.contains(neighbor) { continue }
+                var nextPath = path
+                nextPath.append(neighbor)
+                if neighbor == target { return nextPath }
+                if nextPath.count <= maxHops {
+                    queuePaths.append(nextPath)
+                }
+                visited.insert(neighbor)
+            }
+        }
+
+        return nil
+    }
+
+    // MARK: - Helpers
+
+    private func sanitize(_ data: Data?) -> Data? {
+        guard var value = data, !value.isEmpty else { return nil }
+        if value.count > hopSize {
+            value = Data(value.prefix(hopSize))
+        } else if value.count < hopSize {
+            value.append(Data(repeating: 0, count: hopSize - value.count))
+        }
+        return value
+    }
+}

bitchat/Services/MessageDeduplicationService.swift

@@ -0,0 +1,274 @@
+//
+// MessageDeduplicationService.swift
+// bitchat
+//
+// Handles message deduplication using LRU caches.
+// This is free and unencumbered software released into the public domain.
+//
+
+import Foundation
+
+// MARK: - LRU Deduplication Cache
+
+/// Generic LRU (Least Recently Used) cache for deduplication.
+/// Uses an efficient O(1) lookup with periodic compaction.
+final class LRUDeduplicationCache<Value> {
+    private var map: [String: Value] = [:]
+    private var order: [String] = []
+    private var head: Int = 0
+    private let capacity: Int
+
+    /// Creates a new LRU cache with the specified capacity.
+    /// - Parameter capacity: Maximum number of entries before eviction
+    init(capacity: Int) {
+        precondition(capacity > 0, "LRU cache capacity must be positive")
+        self.capacity = capacity
+    }
+
+    /// Number of active entries in the cache
+    var count: Int {
+        order.count - head
+    }
+
+    /// Checks if a key exists in the cache
+    func contains(_ key: String) -> Bool {
+        map[key] != nil
+    }
+
+    /// Gets the value for a key, or nil if not present
+    func value(for key: String) -> Value? {
+        map[key]
+    }
+
+    /// Records a key-value pair, updating if exists or inserting if new
+    func record(_ key: String, value: Value) {
+        if map[key] == nil {
+            order.append(key)
+        }
+        map[key] = value
+        trimIfNeeded()
+    }
+
+    /// Removes a specific key from the cache
+    func remove(_ key: String) {
+        map.removeValue(forKey: key)
+        // Note: key remains in order array but will be skipped during eviction
+    }
+
+    /// Clears all entries from the cache
+    func clear() {
+        map.removeAll()
+        order.removeAll()
+        head = 0
+    }
+
+    // MARK: - Private
+
+    private func trimIfNeeded() {
+        let activeCount = order.count - head
+        guard activeCount > capacity else { return }
+
+        let overflow = activeCount - capacity
+        for _ in 0..<overflow {
+            guard let victim = popOldest() else { break }
+            map.removeValue(forKey: victim)
+        }
+    }
+
+    private func popOldest() -> String? {
+        // Skip keys that were already removed from map
+        while head < order.count {
+            let key = order[head]
+            head += 1
+
+            // Periodically compact the backing storage
+            if head >= 32 && head * 2 >= order.count {
+                order.removeFirst(head)
+                head = 0
+            }
+
+            // Only return if key is still in map
+            if map[key] != nil {
+                return key
+            }
+        }
+        return nil
+    }
+}
+
+// MARK: - Content Normalizer
+
+/// Normalizes message content for near-duplicate detection.
+enum ContentNormalizer {
+
+    /// Regex to simplify HTTP URLs by stripping query strings and fragments
+    private static let simplifyHTTPURL: NSRegularExpression = {
+        try! NSRegularExpression(
+            pattern: "https?://[^\\s?#]+(?:[?#][^\\s]*)?",
+            options: [.caseInsensitive]
+        )
+    }()
+
+    /// Normalizes content for deduplication comparison.
+    /// - Parameters:
+    ///   - content: The raw message content
+    ///   - prefixLength: Maximum characters to consider (default from TransportConfig)
+    /// - Returns: A hash-based key for comparison
+    static func normalizedKey(
+        _ content: String,
+        prefixLength: Int = TransportConfig.contentKeyPrefixLength
+    ) -> String {
+        // Lowercase for case-insensitive comparison
+        let lowered = content.lowercased()
+        let ns = lowered as NSString
+        let range = NSRange(location: 0, length: ns.length)
+
+        // Simplify URLs by stripping query/fragment
+        var simplified = ""
+        var last = 0
+        for match in simplifyHTTPURL.matches(in: lowered, options: [], range: range) {
+            if match.range.location > last {
+                simplified += ns.substring(with: NSRange(location: last, length: match.range.location - last))
+            }
+            let url = ns.substring(with: match.range)
+            if let queryIndex = url.firstIndex(where: { $0 == "?" || $0 == "#" }) {
+                simplified += String(url[..<queryIndex])
+            } else {
+                simplified += url
+            }
+            last = match.range.location + match.range.length
+        }
+        if last < ns.length {
+            simplified += ns.substring(with: NSRange(location: last, length: ns.length - last))
+        }
+
+        // Trim and collapse whitespace
+        let trimmed = simplified.trimmingCharacters(in: .whitespacesAndNewlines)
+        let collapsed = trimmed.replacingOccurrences(of: "\\s+", with: " ", options: .regularExpression)
+
+        // Take prefix and hash
+        let prefix = String(collapsed.prefix(prefixLength))
+        let hash = prefix.djb2()
+        return String(format: "h:%016llx", hash)
+    }
+}
+
+// MARK: - Message Deduplication Service
+
+/// Service that manages message deduplication using LRU caches.
+/// Provides separate caches for content-based dedup and Nostr event ID dedup.
+final class MessageDeduplicationService {
+
+    /// Cache for content-based near-duplicate detection
+    private let contentCache: LRUDeduplicationCache<Date>
+
+    /// Cache for Nostr event ID deduplication
+    private let nostrEventCache: LRUDeduplicationCache<Bool>
+
+    /// Cache for Nostr ACK deduplication (messageId:ackType:senderPubkey format)
+    private let nostrAckCache: LRUDeduplicationCache<Bool>
+
+    /// Creates a new deduplication service with specified capacities.
+    /// - Parameters:
+    ///   - contentCapacity: Max entries for content cache
+    ///   - nostrEventCapacity: Max entries for Nostr event cache
+    init(
+        contentCapacity: Int = TransportConfig.contentLRUCap,
+        nostrEventCapacity: Int = TransportConfig.uiProcessedNostrEventsCap
+    ) {
+        self.contentCache = LRUDeduplicationCache(capacity: contentCapacity)
+        self.nostrEventCache = LRUDeduplicationCache(capacity: nostrEventCapacity)
+        self.nostrAckCache = LRUDeduplicationCache(capacity: nostrEventCapacity)
+    }
+
+    // MARK: - Content Deduplication
+
+    /// Records content with its timestamp for near-duplicate detection.
+    /// - Parameters:
+    ///   - content: The message content
+    ///   - timestamp: When the content was received
+    func recordContent(_ content: String, timestamp: Date) {
+        let key = ContentNormalizer.normalizedKey(content)
+        contentCache.record(key, value: timestamp)
+    }
+
+    /// Records a pre-normalized content key with its timestamp.
+    /// - Parameters:
+    ///   - key: The normalized content key
+    ///   - timestamp: When the content was received
+    func recordContentKey(_ key: String, timestamp: Date) {
+        contentCache.record(key, value: timestamp)
+    }
+
+    /// Gets the timestamp for previously seen content.
+    /// - Parameter content: The message content
+    /// - Returns: The timestamp when first seen, or nil if not seen
+    func contentTimestamp(for content: String) -> Date? {
+        let key = ContentNormalizer.normalizedKey(content)
+        return contentCache.value(for: key)
+    }
+
+    /// Gets the timestamp for a pre-normalized content key.
+    /// - Parameter key: The normalized content key
+    /// - Returns: The timestamp when first seen, or nil if not seen
+    func contentTimestamp(forKey key: String) -> Date? {
+        contentCache.value(for: key)
+    }
+
+    /// Normalizes content to a deduplication key.
+    /// - Parameter content: The raw content
+    /// - Returns: A normalized hash key
+    func normalizedContentKey(_ content: String) -> String {
+        ContentNormalizer.normalizedKey(content)
+    }
+
+    // MARK: - Nostr Event Deduplication
+
+    /// Checks if a Nostr event has already been processed.
+    /// - Parameter eventId: The event ID
+    /// - Returns: true if already processed
+    func hasProcessedNostrEvent(_ eventId: String) -> Bool {
+        nostrEventCache.contains(eventId)
+    }
+
+    /// Records a Nostr event as processed.
+    /// - Parameter eventId: The event ID
+    func recordNostrEvent(_ eventId: String) {
+        nostrEventCache.record(eventId, value: true)
+    }
+
+    // MARK: - Nostr ACK Deduplication
+
+    /// Checks if a Nostr ACK has already been processed.
+    /// - Parameter ackKey: The ACK key in format "messageId:ackType:senderPubkey"
+    /// - Returns: true if already processed
+    func hasProcessedNostrAck(_ ackKey: String) -> Bool {
+        nostrAckCache.contains(ackKey)
+    }
+
+    /// Records a Nostr ACK as processed.
+    /// - Parameter ackKey: The ACK key in format "messageId:ackType:senderPubkey"
+    func recordNostrAck(_ ackKey: String) {
+        nostrAckCache.record(ackKey, value: true)
+    }
+
+    /// Creates an ACK key from components.
+    static func ackKey(messageId: String, ackType: String, senderPubkey: String) -> String {
+        "\(messageId):\(ackType):\(senderPubkey)"
+    }
+
+    // MARK: - Clear
+
+    /// Clears all caches
+    func clearAll() {
+        contentCache.clear()
+        nostrEventCache.clear()
+        nostrAckCache.clear()
+    }
+
+    /// Clears only the Nostr caches (events and ACKs)
+    func clearNostrCaches() {
+        nostrEventCache.clear()
+        nostrAckCache.clear()
+    }
+}

bitchat/Services/MessageFormattingEngine.swift

@@ -0,0 +1,471 @@
+//
+// MessageFormattingEngine.swift
+// bitchat
+//
+// Handles message text formatting, including mentions, hashtags, URLs, and tokens.
+// This is free and unencumbered software released into the public domain.
+//
+
+import Foundation
+import SwiftUI
+
+// MARK: - Formatting Context Protocol
+
+/// Protocol defining the context needed for message formatting.
+/// Implemented by ChatViewModel to provide runtime state.
+@MainActor
+protocol MessageFormattingContext: AnyObject {
+    /// The user's current nickname
+    var nickname: String { get }
+
+    /// Determines if a message was sent by the current user
+    func isSelfMessage(_ message: BitchatMessage) -> Bool
+
+    /// Gets the color for a message's sender
+    func senderColor(for message: BitchatMessage, isDark: Bool) -> Color
+
+    /// Resolves a peer ID to a clickable URL
+    func peerURL(for peerID: PeerID) -> URL?
+}
+
+// MARK: - Formatting Engine
+
+/// Handles rich text formatting for chat messages.
+/// Extracts mentions, hashtags, URLs, Lightning invoices, and Cashu tokens.
+final class MessageFormattingEngine {
+
+    // MARK: - Precompiled Regexes
+
+    /// Precompiled regex patterns for message content parsing
+    enum Patterns {
+        static let hashtag: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "#([a-zA-Z0-9_]+)", options: [])
+        }()
+
+        static let mention: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "@([\\p{L}0-9_]+(?:#[a-fA-F0-9]{4})?)", options: [])
+        }()
+
+        static let cashu: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "\\bcashu[AB][A-Za-z0-9._-]{40,}\\b", options: [])
+        }()
+
+        static let bolt11: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "(?i)\\bln(bc|tb|bcrt)[0-9][a-z0-9]{50,}\\b", options: [])
+        }()
+
+        static let lnurl: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "(?i)\\blnurl1[a-z0-9]{20,}\\b", options: [])
+        }()
+
+        static let lightningScheme: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "(?i)\\blightning:[^\\s]+", options: [])
+        }()
+
+        static let linkDetector: NSDataDetector? = {
+            try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
+        }()
+
+        static let quickCashuPresence: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "\\bcashu[AB][A-Za-z0-9._-]{40,}\\b", options: [])
+        }()
+
+        static let simplifyHTTPURL: NSRegularExpression = {
+            try! NSRegularExpression(pattern: "https?://[^\\s?#]+(?:[?#][^\\s]*)?", options: [.caseInsensitive])
+        }()
+    }
+
+    // MARK: - Match Types
+
+    /// Types of matches found in message content
+    enum MatchType: String {
+        case hashtag
+        case mention
+        case url
+        case cashu
+        case lightning
+        case bolt11
+        case lnurl
+    }
+
+    /// A match found in message content
+    struct ContentMatch {
+        let range: NSRange
+        let type: MatchType
+    }
+
+    // MARK: - Public API
+
+    /// Formats a message with rich text styling
+    @MainActor
+    static func formatMessage(
+        _ message: BitchatMessage,
+        context: MessageFormattingContext,
+        colorScheme: ColorScheme
+    ) -> AttributedString {
+        let isDark = colorScheme == .dark
+        let isSelf = context.isSelfMessage(message)
+
+        // Check cache first
+        if let cached = message.getCachedFormattedText(isDark: isDark, isSelf: isSelf) {
+            return cached
+        }
+
+        var result = AttributedString()
+        let baseColor: Color = isSelf ? .orange : context.senderColor(for: message, isDark: isDark)
+
+        // Format system messages differently
+        if message.sender == "system" {
+            result = formatSystemMessage(message, isDark: isDark)
+        } else {
+            // Format sender header
+            result = formatSenderHeader(
+                message: message,
+                baseColor: baseColor,
+                isSelf: isSelf,
+                context: context
+            )
+
+            // Format content
+            let contentResult = formatContent(
+                message.content,
+                baseColor: baseColor,
+                isSelf: isSelf,
+                isMentioned: message.mentions?.contains(context.nickname) ?? false
+            )
+            result.append(contentResult)
+
+            // Add timestamp
+            result.append(formatTimestamp(message.formattedTimestamp))
+        }
+
+        // Cache the result
+        message.setCachedFormattedText(result, isDark: isDark, isSelf: isSelf)
+
+        return result
+    }
+
+    /// Formats just the message header (sender portion)
+    @MainActor
+    static func formatHeader(
+        _ message: BitchatMessage,
+        context: MessageFormattingContext,
+        colorScheme: ColorScheme
+    ) -> AttributedString {
+        let isDark = colorScheme == .dark
+        let isSelf = context.isSelfMessage(message)
+        let baseColor: Color = isSelf ? .orange : context.senderColor(for: message, isDark: isDark)
+
+        if message.sender == "system" {
+            var style = AttributeContainer()
+            style.foregroundColor = baseColor
+            style.font = .bitchatSystem(size: 14, weight: .medium, design: .monospaced)
+            return AttributedString(message.sender).mergingAttributes(style)
+        }
+
+        return formatSenderHeader(
+            message: message,
+            baseColor: baseColor,
+            isSelf: isSelf,
+            context: context
+        )
+    }
+
+    /// Extracts mentions from message content
+    static func extractMentions(from content: String) -> [String] {
+        let nsContent = content as NSString
+        let range = NSRange(location: 0, length: nsContent.length)
+        let matches = Patterns.mention.matches(in: content, options: [], range: range)
+
+        return matches.compactMap { match -> String? in
+            guard match.numberOfRanges > 1 else { return nil }
+            let captureRange = match.range(at: 1)
+            guard let swiftRange = Range(captureRange, in: content) else { return nil }
+            return String(content[swiftRange])
+        }
+    }
+
+    /// Checks if content contains a Cashu token
+    static func containsCashuToken(_ content: String) -> Bool {
+        let nsContent = content as NSString
+        let range = NSRange(location: 0, length: nsContent.length)
+        return Patterns.quickCashuPresence.numberOfMatches(in: content, options: [], range: range) > 0
+    }
+
+    // MARK: - Private Helpers
+
+    private static func formatSystemMessage(_ message: BitchatMessage, isDark: Bool) -> AttributedString {
+        var result = AttributedString()
+
+        let content = AttributedString("* \(message.content) *")
+        var contentStyle = AttributeContainer()
+        contentStyle.foregroundColor = Color.gray
+        contentStyle.font = .bitchatSystem(size: 12, design: .monospaced).italic()
+        result.append(content.mergingAttributes(contentStyle))
+
+        // Add timestamp
+        let timestamp = AttributedString(" [\(message.formattedTimestamp)]")
+        var timestampStyle = AttributeContainer()
+        timestampStyle.foregroundColor = Color.gray.opacity(0.5)
+        timestampStyle.font = .bitchatSystem(size: 10, design: .monospaced)
+        result.append(timestamp.mergingAttributes(timestampStyle))
+
+        return result
+    }
+
+    @MainActor
+    private static func formatSenderHeader(
+        message: BitchatMessage,
+        baseColor: Color,
+        isSelf: Bool,
+        context: MessageFormattingContext
+    ) -> AttributedString {
+        var result = AttributedString()
+
+        let (baseName, suffix) = message.sender.splitSuffix()
+        var senderStyle = AttributeContainer()
+        senderStyle.foregroundColor = baseColor
+        let fontWeight: Font.Weight = isSelf ? .bold : .medium
+        senderStyle.font = .bitchatSystem(size: 14, weight: fontWeight, design: .monospaced)
+
+        // Make sender clickable
+        if let spid = message.senderPeerID, let url = context.peerURL(for: spid) {
+            senderStyle.link = url
+        }
+
+        // Build: "<@baseName#suffix> "
+        result.append(AttributedString("<@").mergingAttributes(senderStyle))
+        result.append(AttributedString(baseName).mergingAttributes(senderStyle))
+
+        if !suffix.isEmpty {
+            var suffixStyle = senderStyle
+            suffixStyle.foregroundColor = baseColor.opacity(0.6)
+            result.append(AttributedString(suffix).mergingAttributes(suffixStyle))
+        }
+
+        result.append(AttributedString("> ").mergingAttributes(senderStyle))
+
+        return result
+    }
+
+    private static func formatContent(
+        _ content: String,
+        baseColor: Color,
+        isSelf: Bool,
+        isMentioned: Bool
+    ) -> AttributedString {
+        // For very long content without special tokens, use plain formatting
+        let containsCashu = containsCashuToken(content)
+        if (content.count > 4000 || content.hasVeryLongToken(threshold: 1024)) && !containsCashu {
+            return formatPlainContent(content, baseColor: baseColor, isSelf: isSelf)
+        }
+
+        // Find all matches
+        let matches = findAllMatches(in: content)
+
+        // Build formatted content
+        var result = AttributedString()
+        var lastEnd = content.startIndex
+
+        for match in matches {
+            guard let swiftRange = Range(match.range, in: content) else { continue }
+
+            // Add text before match
+            if lastEnd < swiftRange.lowerBound {
+                let beforeText = String(content[lastEnd..<swiftRange.lowerBound])
+                result.append(formatPlainText(beforeText, baseColor: baseColor, isSelf: isSelf, isMentioned: isMentioned))
+            }
+
+            // Add styled match
+            let matchText = String(content[swiftRange])
+            result.append(formatMatch(matchText, type: match.type, baseColor: baseColor, isSelf: isSelf))
+
+            lastEnd = swiftRange.upperBound
+        }
+
+        // Add remaining text
+        if lastEnd < content.endIndex {
+            let remainingText = String(content[lastEnd...])
+            result.append(formatPlainText(remainingText, baseColor: baseColor, isSelf: isSelf, isMentioned: isMentioned))
+        }
+
+        return result
+    }
+
+    private static func findAllMatches(in content: String) -> [ContentMatch] {
+        let nsContent = content as NSString
+        let nsLen = nsContent.length
+        let fullRange = NSRange(location: 0, length: nsLen)
+
+        // Quick hints to avoid unnecessary regex work
+        let hasMentions = content.contains("@")
+        let hasHashtags = content.contains("#")
+        let hasURLs = content.contains("://") || content.contains("www.") || content.contains("http")
+        let hasLightning = content.lowercased().contains("ln") || content.lowercased().contains("lightning:")
+        let hasCashu = content.lowercased().contains("cashu")
+
+        // Collect matches
+        let mentionMatches = hasMentions ? Patterns.mention.matches(in: content, options: [], range: fullRange) : []
+        let hashtagMatches = hasHashtags ? Patterns.hashtag.matches(in: content, options: [], range: fullRange) : []
+        let urlMatches = hasURLs ? (Patterns.linkDetector?.matches(in: content, options: [], range: fullRange) ?? []) : []
+        let cashuMatches = hasCashu ? Patterns.cashu.matches(in: content, options: [], range: fullRange) : []
+        let lightningMatches = hasLightning ? Patterns.lightningScheme.matches(in: content, options: [], range: fullRange) : []
+        let bolt11Matches = hasLightning ? Patterns.bolt11.matches(in: content, options: [], range: fullRange) : []
+        let lnurlMatches = hasLightning ? Patterns.lnurl.matches(in: content, options: [], range: fullRange) : []
+
+        // Build mention ranges for overlap checking
+        let mentionRanges = mentionMatches.map { $0.range(at: 0) }
+
+        func overlapsMention(_ r: NSRange) -> Bool {
+            mentionRanges.contains { NSIntersectionRange(r, $0).length > 0 }
+        }
+
+        func isStandaloneHashtag(_ r: NSRange) -> Bool {
+            guard let swiftRange = Range(r, in: content) else { return false }
+            if swiftRange.lowerBound == content.startIndex { return true }
+            let prev = content.index(before: swiftRange.lowerBound)
+            return content[prev].isWhitespace || content[prev].isNewline
+        }
+
+        func attachedToMention(_ r: NSRange) -> Bool {
+            guard let swiftRange = Range(r, in: content), swiftRange.lowerBound > content.startIndex else { return false }
+            var i = content.index(before: swiftRange.lowerBound)
+            while true {
+                let ch = content[i]
+                if ch.isWhitespace || ch.isNewline { break }
+                if ch == "@" { return true }
+                if i == content.startIndex { break }
+                i = content.index(before: i)
+            }
+            return false
+        }
+
+        var allMatches: [ContentMatch] = []
+
+        // Add hashtags (excluding those attached to mentions)
+        for match in hashtagMatches {
+            let range = match.range(at: 0)
+            if !overlapsMention(range) && !attachedToMention(range) && isStandaloneHashtag(range) {
+                allMatches.append(ContentMatch(range: range, type: .hashtag))
+            }
+        }
+
+        // Add mentions
+        for match in mentionMatches {
+            allMatches.append(ContentMatch(range: match.range(at: 0), type: .mention))
+        }
+
+        // Add URLs
+        for match in urlMatches where !overlapsMention(match.range) {
+            allMatches.append(ContentMatch(range: match.range, type: .url))
+        }
+
+        // Add Cashu tokens
+        for match in cashuMatches where !overlapsMention(match.range(at: 0)) {
+            allMatches.append(ContentMatch(range: match.range(at: 0), type: .cashu))
+        }
+
+        // Add Lightning scheme URLs
+        for match in lightningMatches where !overlapsMention(match.range(at: 0)) {
+            allMatches.append(ContentMatch(range: match.range(at: 0), type: .lightning))
+        }
+
+        // Add bolt11/lnurl (avoiding overlaps with lightning scheme and URLs)
+        let occupied = urlMatches.map { $0.range } + lightningMatches.map { $0.range(at: 0) }
+        func overlapsOccupied(_ r: NSRange) -> Bool {
+            occupied.contains { NSIntersectionRange(r, $0).length > 0 }
+        }
+
+        for match in bolt11Matches where !overlapsMention(match.range(at: 0)) && !overlapsOccupied(match.range(at: 0)) {
+            allMatches.append(ContentMatch(range: match.range(at: 0), type: .bolt11))
+        }
+
+        for match in lnurlMatches where !overlapsMention(match.range(at: 0)) && !overlapsOccupied(match.range(at: 0)) {
+            allMatches.append(ContentMatch(range: match.range(at: 0), type: .lnurl))
+        }
+
+        // Sort by position
+        return allMatches.sorted { $0.range.location < $1.range.location }
+    }
+
+    private static func formatPlainContent(_ content: String, baseColor: Color, isSelf: Bool) -> AttributedString {
+        var style = AttributeContainer()
+        style.foregroundColor = baseColor
+        style.font = isSelf
+            ? .bitchatSystem(size: 14, weight: .bold, design: .monospaced)
+            : .bitchatSystem(size: 14, design: .monospaced)
+        return AttributedString(content).mergingAttributes(style)
+    }
+
+    private static func formatPlainText(_ text: String, baseColor: Color, isSelf: Bool, isMentioned: Bool) -> AttributedString {
+        guard !text.isEmpty else { return AttributedString() }
+
+        var style = AttributeContainer()
+        style.foregroundColor = baseColor
+        style.font = isSelf
+            ? .bitchatSystem(size: 14, weight: .bold, design: .monospaced)
+            : .bitchatSystem(size: 14, design: .monospaced)
+
+        if isMentioned {
+            style.font = style.font?.bold()
+        }
+
+        return AttributedString(text).mergingAttributes(style)
+    }
+
+    private static func formatMatch(_ text: String, type: MatchType, baseColor: Color, isSelf: Bool) -> AttributedString {
+        var style = AttributeContainer()
+
+        switch type {
+        case .mention:
+            // Split optional '#abcd' suffix
+            let (baseName, suffix) = text.splitSuffix()
+            var result = AttributedString()
+
+            var mentionStyle = AttributeContainer()
+            mentionStyle.foregroundColor = .blue
+            mentionStyle.font = .bitchatSystem(size: 14, weight: .semibold, design: .monospaced)
+            result.append(AttributedString(baseName).mergingAttributes(mentionStyle))
+
+            if !suffix.isEmpty {
+                var suffixStyle = mentionStyle
+                suffixStyle.foregroundColor = Color.gray.opacity(0.7)
+                result.append(AttributedString(suffix).mergingAttributes(suffixStyle))
+            }
+
+            return result
+
+        case .hashtag:
+            style.foregroundColor = .purple
+            style.font = .bitchatSystem(size: 14, weight: .medium, design: .monospaced)
+
+        case .url:
+            style.foregroundColor = .blue
+            style.font = .bitchatSystem(size: 14, design: .monospaced)
+            style.underlineStyle = .single
+            if let url = URL(string: text) {
+                style.link = url
+            }
+
+        case .cashu:
+            style.foregroundColor = .green
+            style.font = .bitchatSystem(size: 14, weight: .medium, design: .monospaced)
+            style.backgroundColor = Color.green.opacity(0.1)
+
+        case .lightning, .bolt11, .lnurl:
+            style.foregroundColor = .yellow
+            style.font = .bitchatSystem(size: 14, weight: .medium, design: .monospaced)
+            style.backgroundColor = Color.yellow.opacity(0.1)
+        }
+
+        return AttributedString(text).mergingAttributes(style)
+    }
+
+    private static func formatTimestamp(_ timestamp: String) -> AttributedString {
+        let text = AttributedString(" [\(timestamp)]")
+        var style = AttributeContainer()
+        style.foregroundColor = Color.gray.opacity(0.5)
+        style.font = .bitchatSystem(size: 10, design: .monospaced)
+        return text.mergingAttributes(style)
+    }
+}

bitchat/Services/MessageRetryService.swift

@@ -1,212 +0,0 @@
-//
-// MessageRetryService.swift
-// bitchat
-//
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-import Combine
-import CryptoKit
-
-struct RetryableMessage {
-    let id: String
-    let originalMessageID: String? 
-    let originalTimestamp: Date?
-    let content: String
-    let mentions: [String]?
-    let isPrivate: Bool
-    let recipientPeerID: String?
-    let recipientNickname: String?
-    let retryCount: Int
-    let maxRetries: Int = 3
-    let nextRetryTime: Date
-}
-
-class MessageRetryService {
-    static let shared = MessageRetryService()
-    
-    private var retryQueue: [RetryableMessage] = []
-    private var retryTimer: Timer?
-    private let retryInterval: TimeInterval = 2.0 // Retry every 2 seconds for faster sync
-    private let maxQueueSize = 50
-    
-    weak var meshService: BluetoothMeshService?
-    
-    private init() {
-        startRetryTimer()
-    }
-    
-    deinit {
-        retryTimer?.invalidate()
-    }
-    
-    private func startRetryTimer() {
-        retryTimer = Timer.scheduledTimer(withTimeInterval: retryInterval, repeats: true) { [weak self] _ in
-            self?.processRetryQueue()
-        }
-    }
-    
-    func addMessageForRetry(
-        content: String,
-        mentions: [String]? = nil,
-        isPrivate: Bool = false,
-        recipientPeerID: String? = nil,
-        recipientNickname: String? = nil,
-        originalMessageID: String? = nil,
-        originalTimestamp: Date? = nil
-    ) {
-        // Don't queue empty or whitespace-only messages
-        guard !content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
-            return
-        }
-        
-        // Don't queue if we're at capacity
-        guard retryQueue.count < maxQueueSize else {
-            return
-        }
-        
-        // Check if this message is already in the queue
-        if let messageID = originalMessageID {
-            let alreadyQueued = retryQueue.contains { msg in
-                msg.originalMessageID == messageID
-            }
-            if alreadyQueued {
-                return // Don't add duplicate
-            }
-        }
-        
-        let retryMessage = RetryableMessage(
-            id: UUID().uuidString,
-            originalMessageID: originalMessageID,
-            originalTimestamp: originalTimestamp,
-            content: content,
-            mentions: mentions,
-            isPrivate: isPrivate,
-            recipientPeerID: recipientPeerID,
-            recipientNickname: recipientNickname,
-            retryCount: 0,
-            nextRetryTime: Date().addingTimeInterval(retryInterval)
-        )
-        
-        retryQueue.append(retryMessage)
-        
-        // Sort the queue by original timestamp to maintain message order
-        retryQueue.sort { (msg1, msg2) in
-            let time1 = msg1.originalTimestamp ?? Date.distantPast
-            let time2 = msg2.originalTimestamp ?? Date.distantPast
-            return time1 < time2
-        }
-    }
-    
-    private func processRetryQueue() {
-        guard meshService != nil else { return }
-        
-        let now = Date()
-        var messagesToRetry: [RetryableMessage] = []
-        var updatedQueue: [RetryableMessage] = []
-        
-        for message in retryQueue {
-            if message.nextRetryTime <= now {
-                messagesToRetry.append(message)
-            } else {
-                updatedQueue.append(message)
-            }
-        }
-        
-        retryQueue = updatedQueue
-        
-        // Sort messages by original timestamp to maintain order
-        messagesToRetry.sort { (msg1, msg2) in
-            let time1 = msg1.originalTimestamp ?? Date.distantPast
-            let time2 = msg2.originalTimestamp ?? Date.distantPast
-            return time1 < time2
-        }
-        
-        // Send messages with delay to maintain order
-        for (index, message) in messagesToRetry.enumerated() {
-            // Check if we should still retry
-            if message.retryCount >= message.maxRetries {
-                continue
-            }
-            
-            // Add delay between messages to ensure proper ordering
-            let delay = Double(index) * 0.05 // 50ms between messages
-            
-            DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
-                guard let self = self,
-                      let meshService = self.meshService else { return }
-                
-                // Check connectivity before retrying
-                let viewModel = meshService.delegate as? ChatViewModel
-                let connectedPeers = viewModel?.connectedPeers ?? []
-                
-                if message.isPrivate {
-                    // For private messages, check if recipient is connected
-                    if let recipientID = message.recipientPeerID,
-                       connectedPeers.contains(recipientID) {
-                        // Retry private message
-                        meshService.sendPrivateMessage(
-                            message.content,
-                            to: recipientID,
-                            recipientNickname: message.recipientNickname ?? "unknown",
-                            messageID: message.originalMessageID
-                        )
-                    } else {
-                        // Recipient not connected, keep in queue with updated retry time
-                        var updatedMessage = message
-                        updatedMessage = RetryableMessage(
-                            id: message.id,
-                            originalMessageID: message.originalMessageID,
-                            originalTimestamp: message.originalTimestamp,
-                            content: message.content,
-                            mentions: message.mentions,
-                            isPrivate: message.isPrivate,
-                            recipientPeerID: message.recipientPeerID,
-                            recipientNickname: message.recipientNickname,
-                            retryCount: message.retryCount + 1,
-                            nextRetryTime: Date().addingTimeInterval(self.retryInterval * Double(message.retryCount + 2))
-                        )
-                        self.retryQueue.append(updatedMessage)
-                    }
-                } else {
-                    // Regular message
-                    if !connectedPeers.isEmpty {
-                        meshService.sendMessage(
-                            message.content,
-                            mentions: message.mentions ?? [],
-                            to: nil,
-                            messageID: message.originalMessageID,
-                            timestamp: message.originalTimestamp
-                        )
-                    } else {
-                        // No peers connected, keep in queue
-                        var updatedMessage = message
-                        updatedMessage = RetryableMessage(
-                            id: message.id,
-                            originalMessageID: message.originalMessageID,
-                            originalTimestamp: message.originalTimestamp,
-                            content: message.content,
-                            mentions: message.mentions,
-                            isPrivate: message.isPrivate,
-                            recipientPeerID: message.recipientPeerID,
-                            recipientNickname: message.recipientNickname,
-                            retryCount: message.retryCount + 1,
-                            nextRetryTime: Date().addingTimeInterval(self.retryInterval * Double(message.retryCount + 2))
-                        )
-                        self.retryQueue.append(updatedMessage)
-                    }
-                }
-            }
-        }
-    }
-    
-    func clearRetryQueue() {
-        retryQueue.removeAll()
-    }
-    
-    func getRetryQueueCount() -> Int {
-        return retryQueue.count
-    }
-}

bitchat/Services/MessageRouter.swift

@@ -1,671 +1,112 @@
+import BitLogger
 import Foundation
-import Combine
 
-/// Routes messages through the appropriate transport (Bluetooth mesh or Nostr)
+/// Routes messages using available transports (Mesh, Nostr, etc.)
 @MainActor
-class MessageRouter: ObservableObject {
-    
-    enum Transport {
-        case bluetoothMesh
-        case nostr
-    }
-    
-    enum DeliveryStatus {
-        case pending
-        case sent
-        case delivered
-        case failed(Error)
-    }
-    
-    struct RoutedMessage {
-        let id: String
-        let content: String
-        let recipientNoisePublicKey: Data
-        let transport: Transport
-        let timestamp: Date
-        var status: DeliveryStatus
-    }
-    
-    @Published private(set) var pendingMessages: [String: RoutedMessage] = [:]
-    
-    private let meshService: BluetoothMeshService
-    private let nostrRelay: NostrRelayManager
-    private let favoritesService: FavoritesPersistenceService
-    private let processedMessagesService = ProcessedMessagesService.shared
-    
-    private var cancellables = Set<AnyCancellable>()
-    private let messageDeduplication = LRUCache<String, Date>(maxSize: 1000)
-    
-    init(
-        meshService: BluetoothMeshService,
-        nostrRelay: NostrRelayManager
-    ) {
-        self.meshService = meshService
-        self.nostrRelay = nostrRelay
-        self.favoritesService = FavoritesPersistenceService.shared
-        
-        setupBindings()
-    }
-    
-    /// Send a message to a peer, automatically selecting the best transport
-    func sendMessage(
-        _ content: String,
-        to recipientNoisePublicKey: Data,
-        preferredTransport: Transport? = nil,
-        messageId: String? = nil
-    ) async throws {
-        
-        let finalMessageId = messageId ?? UUID().uuidString
-        
-        // Check if peer is available on mesh (actually connected, not just known)
-        let recipientHexID = recipientNoisePublicKey.hexEncodedString()
-        let peerAvailableOnMesh = meshService.isPeerConnected(recipientHexID)
-        
-        // Check if this is a mutual favorite
-        let isMutualFavorite = favoritesService.isMutualFavorite(recipientNoisePublicKey)
-        
-        // Determine transport
-        let transport: Transport
-        if let preferred = preferredTransport {
-            transport = preferred
-        } else if peerAvailableOnMesh {
-            // Always prefer mesh when available
-            transport = .bluetoothMesh
-        } else if isMutualFavorite {
-            // Use Nostr for mutual favorites when not on mesh
-            transport = .nostr
-        } else {
-            throw MessageRouterError.peerNotReachable
-        }
-        
-        // Create routed message
-        let routedMessage = RoutedMessage(
-            id: finalMessageId,
-            content: content,
-            recipientNoisePublicKey: recipientNoisePublicKey,
-            transport: transport,
-            timestamp: Date(),
-            status: .pending
-        )
-        
-        pendingMessages[finalMessageId] = routedMessage
-        
-        // Route based on transport
-        switch transport {
-        case .bluetoothMesh:
-            try await sendViaMesh(routedMessage)
-            
-        case .nostr:
-            try await sendViaNostr(routedMessage)
-        }
-    }
-    
-    /// Send a favorite/unfavorite notification
-    func sendFavoriteNotification(
-        to recipientNoisePublicKey: Data,
-        isFavorite: Bool
-    ) async throws {
-        
-        // messageType is used for logging below
-        // let messageType: MessageType = isFavorite ? .favorited : .unfavorited
-        let recipientHexID = recipientNoisePublicKey.hexEncodedString()
-        let action = isFavorite ? "favorite" : "unfavorite"
-        
-        SecureLogger.log("📤 Sending \(action) notification to \(recipientHexID)", 
-                        category: SecureLogger.session, level: .info)
-        
-        // Try mesh first
-        if meshService.getPeerNicknames()[recipientHexID] != nil {
-            SecureLogger.log("📡 Sending \(action) notification via Bluetooth mesh", 
-                            category: SecureLogger.session, level: .info)
-            
-            // Send via mesh as a system message
-            meshService.sendFavoriteNotification(to: recipientHexID, isFavorite: isFavorite)
-            
-        } else if let favoriteStatus = favoritesService.getFavoriteStatus(for: recipientNoisePublicKey),
-                  let recipientNostrPubkey = favoriteStatus.peerNostrPublicKey {
-            
-            SecureLogger.log("🌐 Sending \(action) notification via Nostr to \(favoriteStatus.peerNickname)", 
-                            category: SecureLogger.session, level: .info)
-            
-            // Send via Nostr as a special message
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else {
-                throw MessageRouterError.noNostrIdentity
-            }
-            
-            // Include our npub in the content
-            let content = isFavorite ? "FAVORITED:\(senderIdentity.npub)" : "UNFAVORITED:\(senderIdentity.npub)"
-            let event = try NostrProtocol.createPrivateMessage(
-                content: content,
-                recipientPubkey: recipientNostrPubkey,
-                senderIdentity: senderIdentity
-            )
-            
-            nostrRelay.sendEvent(event)
-        } else {
-            SecureLogger.log("⚠️ Cannot send \(action) notification - peer not reachable via mesh or Nostr", 
-                            category: SecureLogger.session, level: .warning)
-        }
-    }
-    
-    // MARK: - Private Methods
-    
-    private func sendViaMesh(_ message: RoutedMessage) async throws {
-        // Send the message through mesh - using sendPrivateMessage for now
-        let recipientHexID = message.recipientNoisePublicKey.hexEncodedString()
-        if let recipientNickname = meshService.getPeerNicknames()[recipientHexID] {
-            meshService.sendPrivateMessage(message.content, to: recipientHexID, recipientNickname: recipientNickname, messageID: message.id)
-        }
-        
-        // Update status
-        pendingMessages[message.id]?.status = .sent
-    }
-    
-    private func sendViaNostr(_ message: RoutedMessage) async throws {
-        // Get recipient's Nostr public key
-        let favoriteStatus = favoritesService.getFavoriteStatus(for: message.recipientNoisePublicKey)
-        
-        // Looking up Nostr key for recipient
-        
-        if favoriteStatus != nil {
-            // Found favorite relationship
-        } else {
-            SecureLogger.log("❌ No favorite relationship found", 
-                            category: SecureLogger.session, level: .error)
-        }
-        
-        guard let favoriteStatus = favoriteStatus,
-              let recipientNostrPubkey = favoriteStatus.peerNostrPublicKey else {
-            throw MessageRouterError.noNostrPublicKey
-        }
-        
-        // Get sender's Nostr identity
-        guard let senderIdentity = try NostrIdentityBridge.getCurrentNostrIdentity() else {
-            throw MessageRouterError.noNostrIdentity
-        }
-        
-        // Create NIP-17 encrypted message with structured content
-        let structuredContent = "MSG:\(message.id):\(message.content)"
-        let event = try NostrProtocol.createPrivateMessage(
-            content: structuredContent,
-            recipientPubkey: recipientNostrPubkey,
-            senderIdentity: senderIdentity
-        )
-        
-        // Created gift wrap event
-        
-        // Send via relay
-        nostrRelay.sendEvent(event)
-        
-        // Update status
-        pendingMessages[message.id]?.status = .sent
-    }
-    
-    private func setupBindings() {
-        // Monitor Nostr messages
-        setupNostrMessageHandling()
-        
-        // Clean up old pending messages periodically
-        Timer.publish(every: 60, on: .main, in: .common)
-            .autoconnect()
-            .sink { [weak self] _ in
-                self?.cleanupOldMessages()
-            }
-            .store(in: &cancellables)
-        
-        // Listen for app becoming active to check for messages
-        NotificationCenter.default.publisher(for: .appDidBecomeActive)
-            .sink { [weak self] _ in
-                self?.checkForNostrMessages()
-            }
-            .store(in: &cancellables)
-    }
-    
-    private func setupNostrMessageHandling() {
-        guard let currentIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { 
-            SecureLogger.log("⚠️ No Nostr identity available for initial setup", category: SecureLogger.session, level: .warning)
-            return 
-        }
-        
-        SecureLogger.log("🚀 Setting up Nostr message handling for \(currentIdentity.npub)", 
-                        category: SecureLogger.session, level: .info)
-        
-        // Connect to relays if not already connected
-        if !nostrRelay.isConnected {
-            nostrRelay.connect()
-            
-            // Wait for connections to establish before subscribing
-            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) { [weak self] in
-                self?.subscribeToNostrMessages()
-            }
-        } else {
-            // Already connected, subscribe immediately
-            subscribeToNostrMessages()
-        }
-    }
-    
-    /// Check for Nostr messages when app becomes active
-    func checkForNostrMessages() {
-        // Checking for Nostr messages
-        
-        guard (try? NostrIdentityBridge.getCurrentNostrIdentity()) != nil else { 
-            SecureLogger.log("⚠️ No Nostr identity available for message check", category: SecureLogger.session, level: .warning)
-            return 
-        }
-        
-        // Ensure we're connected to relays first
-        if !nostrRelay.isConnected {
-            // Connecting to Nostr relays
-            nostrRelay.connect()
-            
-            // Wait a bit for connections to establish before subscribing
-            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { [weak self] in
-                self?.subscribeToNostrMessages()
-            }
-        } else {
-            // Already connected, subscribe immediately
-            subscribeToNostrMessages()
-        }
-    }
-    
-    private func subscribeToNostrMessages() {
-        guard let currentIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { return }
-        
-        // Subscribing to Nostr messages
-        // Full pubkey recorded
-        // Pubkey length verified
-        
-        // Unsubscribe existing subscription to refresh
-        nostrRelay.unsubscribe(id: "router-messages")
-        
-        // Create a new subscription for recent messages
-        let sinceDate = processedMessagesService.getSubscriptionSinceDate()
-        let filter = NostrFilter.giftWrapsFor(
-            pubkey: currentIdentity.publicKeyHex,
-            since: sinceDate
-        )
-        
-        // Subscribing to messages since date
-        
-        // Subscribing to gift wraps
-        
-        nostrRelay.subscribe(filter: filter, id: "router-messages") { [weak self] event in
-            // Received Nostr event
-            self?.handleNostrMessage(event)
-        }
-    }
-    
-    private func handleNostrMessage(_ giftWrap: NostrEvent) {
-        // Check if we've already processed this event
-        if processedMessagesService.isMessageProcessed(giftWrap.id) {
-            // Skipping already processed event
-            return
-        }
-        
-        // Attempting to decrypt gift wrap
-        // Full event ID recorded
-        // Event timestamp recorded
-        // Event tags recorded
-        
-        // Decrypt the message
-        guard let currentIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else {
-            SecureLogger.log("❌ No current Nostr identity available", 
-                            category: SecureLogger.session, level: .error)
-            return
-        }
-        
-        // Check if this event is actually tagged for us
-        let ourPubkey = currentIdentity.publicKeyHex
-        let isTaggedForUs = giftWrap.tags.contains { tag in
-            tag.count >= 2 && tag[0] == "p" && tag[1] == ourPubkey
-        }
-        
-        if !isTaggedForUs {
-            SecureLogger.log("⚠️ Gift wrap not tagged for us! Our pubkey: \(ourPubkey.prefix(8))..., Event tags: \(giftWrap.tags)", 
-                            category: SecureLogger.session, level: .warning)
-            return
-        }
-        
-        do {
-            let (content, senderPubkey) = try NostrProtocol.decryptPrivateMessage(
-                giftWrap: giftWrap,
-                recipientIdentity: currentIdentity
-            )
-            
-            SecureLogger.log("✅ Successfully decrypted message from \(senderPubkey.prefix(8))...: \(content)", 
-                            category: SecureLogger.session, level: .info)
-        
-            // Mark this event as processed to avoid duplicates on app restart
-            let eventTimestamp = Date(timeIntervalSince1970: TimeInterval(giftWrap.created_at))
-            processedMessagesService.markMessageAsProcessed(giftWrap.id, timestamp: eventTimestamp)
-        
-            // Check for deduplication within current session
-            let messageHash = "\(senderPubkey)-\(content)-\(giftWrap.created_at)"
-            if messageDeduplication.get(messageHash) != nil {
-                return // Already processed in this session
-            }
-            messageDeduplication.set(messageHash, value: Date())
-        
-        // Handle special messages
-        if content.hasPrefix("FAVORITED") || content.hasPrefix("UNFAVORITED") {
-            let parts = content.split(separator: ":")
-            let isFavorite = parts.first == "FAVORITED"
-            let nostrNpub = parts.count > 1 ? String(parts[1]) : nil
-            handleFavoriteNotification(from: senderPubkey, isFavorite: isFavorite, nostrNpub: nostrNpub)
-            return
-        }
-        
-        // Handle delivery acknowledgments
-        if content.hasPrefix("DELIVERED:") {
-            let parts = content.split(separator: ":")
-            if parts.count > 1 {
-                let messageId = String(parts[1])
-                handleDeliveryAcknowledgment(messageId: messageId, from: senderPubkey)
-            }
-            return
-        }
-        
-        // Handle read receipts
-        if content.hasPrefix("READ:") {
-            let parts = content.split(separator: ":", maxSplits: 1)
-            if parts.count > 1 {
-                let receiptDataString = String(parts[1])
-                if let receiptData = Data(base64Encoded: receiptDataString),
-                   let receipt = ReadReceipt.fromBinaryData(receiptData) {
-                    handleReadReceipt(receipt, from: senderPubkey)
+final class MessageRouter {
+    private let transports: [Transport]
+    private var outbox: [PeerID: [(content: String, nickname: String, messageID: String)]] = [:] // peerID -> queued messages
+
+    init(transports: [Transport]) {
+        self.transports = transports
+
+        // Observe favorites changes to learn Nostr mapping and flush queued messages
+        NotificationCenter.default.addObserver(
+            forName: .favoriteStatusChanged,
+            object: nil,
+            queue: .main
+        ) { [weak self] note in
+            guard let self = self else { return }
+            if let data = note.userInfo?["peerPublicKey"] as? Data {
+                let peerID = PeerID(publicKey: data)
+                Task { @MainActor in
+                    self.flushOutbox(for: peerID)
                 }
             }
-            return
-        }
-        
-        // Find the sender's Noise public key
-        guard let senderNoiseKey = findNoisePublicKey(for: senderPubkey) else { return }
-        
-        // Parse structured message content
-        var messageId = UUID().uuidString
-        var messageContent = content
-        
-        if content.hasPrefix("MSG:") {
-            let parts = content.split(separator: ":", maxSplits: 2)
-            if parts.count >= 3 {
-                messageId = String(parts[1])
-                messageContent = String(parts[2])
-            }
-        }
-        
-        // Create a BitchatMessage and inject into the stream
-        let chatMessage = BitchatMessage(
-            id: messageId,
-            sender: favoritesService.getFavoriteStatus(for: senderNoiseKey)?.peerNickname ?? "Unknown",
-            content: messageContent,
-            timestamp: Date(timeIntervalSince1970: TimeInterval(giftWrap.created_at)),
-            isRelay: false,
-            originalSender: nil,
-            isPrivate: true,
-            recipientNickname: nil,
-            senderPeerID: senderNoiseKey.hexEncodedString(),
-            mentions: nil,
-            deliveryStatus: .delivered(to: "nostr", at: Date())
-        )
-        
-            // Post notification for ChatViewModel to handle
-            NotificationCenter.default.post(
-                name: .nostrMessageReceived,
-                object: nil,
-                userInfo: ["message": chatMessage]
-            )
-            
-            // Send delivery acknowledgment back to sender
-            sendDeliveryAcknowledgment(for: chatMessage.id, to: senderPubkey)
-            
-        } catch {
-            SecureLogger.log("❌ Failed to decrypt gift wrap: \(error)", 
-                            category: SecureLogger.session, level: .error)
-        }
-    }
-    
-    private func handleFavoriteNotification(from nostrPubkey: String, isFavorite: Bool, nostrNpub: String? = nil) {
-        // Find the sender's Noise public key
-        guard let senderNoiseKey = findNoisePublicKey(for: nostrPubkey) else { return }
-        
-        // Update favorites service - nostrPubkey is already the hex public key
-        favoritesService.updatePeerFavoritedUs(
-            peerNoisePublicKey: senderNoiseKey,
-            favorited: isFavorite,
-            peerNostrPublicKey: nostrPubkey
-        )
-        
-        // Post notification for UI update
-        NotificationCenter.default.post(
-            name: .favoriteStatusChanged,
-            object: nil,
-            userInfo: [
-                "peerPublicKey": senderNoiseKey,
-                "isFavorite": isFavorite
-            ]
-        )
-    }
-    
-    private func findNoisePublicKey(for nostrPubkey: String) -> Data? {
-        // Search through favorites for matching Nostr pubkey
-        for (noiseKey, relationship) in favoritesService.favorites {
-            if relationship.peerNostrPublicKey == nostrPubkey {
-                return noiseKey
-            }
-        }
-        return nil
-    }
-    
-    private func handleDeliveryAcknowledgment(messageId: String, from senderPubkey: String) {
-        SecureLogger.log("✅ Received delivery acknowledgment for message \(messageId) from \(senderPubkey)", 
-                        category: SecureLogger.session, level: .info)
-        
-        // Find the sender's Noise public key
-        guard let senderNoiseKey = findNoisePublicKey(for: senderPubkey) else { return }
-        
-        // Post notification for ChatViewModel to update delivery status
-        NotificationCenter.default.post(
-            name: .messageDeliveryAcknowledged,
-            object: nil,
-            userInfo: [
-                "messageId": messageId,
-                "senderNoiseKey": senderNoiseKey
-            ]
-        )
-    }
-    
-    private func handleReadReceipt(_ receipt: ReadReceipt, from senderPubkey: String) {
-        SecureLogger.log("📖 Received read receipt for message \(receipt.originalMessageID) from \(senderPubkey)", 
-                        category: SecureLogger.session, level: .info)
-        
-        // Find the sender's Noise public key
-        guard let senderNoiseKey = findNoisePublicKey(for: senderPubkey) else { return }
-        let senderHexID = senderNoiseKey.hexEncodedString()
-        
-        // Update the receipt with the correct sender ID
-        var updatedReceipt = receipt
-        updatedReceipt.readerID = senderHexID
-        
-        // Post notification for ChatViewModel to process
-        NotificationCenter.default.post(
-            name: .readReceiptReceived,
-            object: nil,
-            userInfo: ["receipt": updatedReceipt]
-        )
-    }
-    
-    func sendReadReceipt(
-        for originalMessageID: String,
-        to recipientNoisePublicKey: Data,
-        preferredTransport: Transport? = nil
-    ) async throws {
-        SecureLogger.log("📖 Sending read receipt for message \(originalMessageID)", 
-                        category: SecureLogger.session, level: .info)
-        
-        // Get nickname from delegate or use default
-        let nickname = (meshService.delegate as? ChatViewModel)?.nickname ?? "Anonymous"
-        
-        // Create read receipt
-        let receipt = ReadReceipt(
-            originalMessageID: originalMessageID,
-            readerID: meshService.myPeerID,
-            readerNickname: nickname
-        )
-        
-        // Encode receipt
-        let receiptData = receipt.toBinaryData()
-        let content = "READ:\(receiptData.base64EncodedString())"
-        
-        // Check if peer is connected via mesh (mesh takes precedence)
-        let recipientHexID = recipientNoisePublicKey.hexEncodedString()
-        
-        // First check if the peer is currently connected with the given ID
-        var actualRecipientHexID = recipientHexID
-        var actualRecipientNoiseKey = recipientNoisePublicKey
-        
-        // Always check if they reconnected with a new ID, even if preferredTransport is specified
-        if let favoriteStatus = favoritesService.getFavoriteStatus(for: recipientNoisePublicKey) {
-            let peerNickname = favoriteStatus.peerNickname
-            
-            // Search through all current peers to find one with the same nickname
-            for (currentPeerID, currentNickname) in meshService.getPeerNicknames() {
-                if currentNickname == peerNickname,
-                   currentPeerID != recipientHexID,
-                   let currentNoiseKey = Data(hexString: currentPeerID) {
-                    SecureLogger.log("🔄 Found updated peer ID for \(peerNickname): \(recipientHexID) -> \(currentPeerID)", 
-                                    category: SecureLogger.session, level: .info)
-                    actualRecipientHexID = currentPeerID
-                    actualRecipientNoiseKey = currentNoiseKey
-                    break
-                }
-            }
-            
-            // If still not found in connected peers, check all favorites for the current key
-            if meshService.getPeerNicknames()[actualRecipientHexID] == nil {
-                // Search through all favorites to find the current noise key for this nickname
-                for (noiseKey, relationship) in favoritesService.favorites {
-                    if relationship.peerNickname == peerNickname && relationship.peerNostrPublicKey != nil {
-                        SecureLogger.log("🔄 Using current favorite key for \(peerNickname): \(recipientHexID) -> \(noiseKey.hexEncodedString())", 
-                                        category: SecureLogger.session, level: .info)
-                        actualRecipientHexID = noiseKey.hexEncodedString()
-                        actualRecipientNoiseKey = noiseKey
-                        break
-                    }
+            // Handle key updates
+            if let newKey = note.userInfo?["peerPublicKey"] as? Data,
+               let _ = note.userInfo?["isKeyUpdate"] as? Bool {
+                let peerID = PeerID(publicKey: newKey)
+                Task { @MainActor in
+                    self.flushOutbox(for: peerID)
                 }
             }
         }
-        
-        let isConnectedOnMesh = meshService.isPeerConnected(actualRecipientHexID)
-        
-        if isConnectedOnMesh && preferredTransport != .nostr {
-            // Send via mesh
-            SecureLogger.log("📡 Sending read receipt via mesh to \(actualRecipientHexID)", 
-                            category: SecureLogger.session, level: .debug)
-            meshService.sendReadReceipt(receipt, to: actualRecipientHexID)
+    }
+
+    func sendPrivate(_ content: String, to peerID: PeerID, recipientNickname: String, messageID: String) {
+        // Try to find a reachable transport
+        if let transport = transports.first(where: { $0.isPeerReachable(peerID) }) {
+            SecureLogger.debug("Routing PM via \(type(of: transport)) to \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+            transport.sendPrivateMessage(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
         } else {
-            // Send via Nostr
-            SecureLogger.log("🌐 Sending read receipt via Nostr to \(actualRecipientHexID)", 
-                            category: SecureLogger.session, level: .debug)
-            
-            // Get recipient's Nostr public key using the actual current noise key
-            let favoriteStatus = favoritesService.getFavoriteStatus(for: actualRecipientNoiseKey)
-            guard let recipientNostrPubkey = favoriteStatus?.peerNostrPublicKey else {
-                SecureLogger.log("❌ Cannot send read receipt - no Nostr key for recipient", 
-                                category: SecureLogger.session, level: .error)
-                throw MessageRouterError.noNostrKey
-            }
-            
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else {
-                SecureLogger.log("⚠️ No Nostr identity available for read receipt", 
-                                category: SecureLogger.session, level: .warning)
-                throw MessageRouterError.noIdentity
-            }
-            
-            // Create read receipt message
-            guard let event = try? NostrProtocol.createPrivateMessage(
-                content: content,
-                recipientPubkey: recipientNostrPubkey,
-                senderIdentity: senderIdentity
-            ) else {
-                SecureLogger.log("❌ Failed to create read receipt", 
-                                category: SecureLogger.session, level: .error)
-                throw MessageRouterError.encryptionFailed
-            }
-            
-            // Send via relay
-            nostrRelay.sendEvent(event)
+            // Queue for later
+            if outbox[peerID] == nil { outbox[peerID] = [] }
+            outbox[peerID]?.append((content, recipientNickname, messageID))
+            SecureLogger.debug("Queued PM for \(peerID.id.prefix(8))… (no reachable transport) id=\(messageID.prefix(8))…", category: .session)
         }
     }
-    
-    private func sendDeliveryAcknowledgment(for messageId: String, to recipientNostrPubkey: String) {
-        SecureLogger.log("📤 Sending delivery acknowledgment for message \(messageId)", 
-                        category: SecureLogger.session, level: .debug)
+
+    func sendReadReceipt(_ receipt: ReadReceipt, to peerID: PeerID) {
+        if let transport = transports.first(where: { $0.isPeerReachable(peerID) }) {
+            SecureLogger.debug("Routing READ ack via \(type(of: transport)) to \(peerID.id.prefix(8))… id=\(receipt.originalMessageID.prefix(8))…", category: .session)
+            transport.sendReadReceipt(receipt, to: peerID)
+        } else if !transports.isEmpty {
+            // Fallback to last transport (usually Nostr) if neither is explicitly reachable?
+            // Or better: just try the first one that supports it?
+            // Existing logic preferred mesh, then nostr.
+            // If neither reachable, existing logic queued it (via mesh usually) or sent via nostr.
+            // Let's stick to "try reachable". If none, maybe pick the first one to queue?
+            // Actually, for READ receipts, we might want to just fire-and-forget on the "best effort" transport.
+            // But let's stick to the reachable check.
+            SecureLogger.debug("No reachable transport for READ ack to \(peerID.id.prefix(8))…", category: .session)
+        }
+    }
+
+    func sendDeliveryAck(_ messageID: String, to peerID: PeerID) {
+        if let transport = transports.first(where: { $0.isPeerReachable(peerID) }) {
+            SecureLogger.debug("Routing DELIVERED ack via \(type(of: transport)) to \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+            transport.sendDeliveryAck(for: messageID, to: peerID)
+        }
+    }
+
+    func sendFavoriteNotification(to peerID: PeerID, isFavorite: Bool) {
+        if let transport = transports.first(where: { $0.isPeerConnected(peerID) }) {
+            transport.sendFavoriteNotification(to: peerID, isFavorite: isFavorite)
+        } else if let transport = transports.first(where: { $0.isPeerReachable(peerID) }) {
+             transport.sendFavoriteNotification(to: peerID, isFavorite: isFavorite)
+        } else {
+            // Fallback: try all? or just the last one?
+            // Old logic: if mesh connected, mesh. Else nostr.
+            // Note: NostrTransport.isPeerReachable now returns true if mapped.
+            // If not mapped, we can't send via Nostr anyway.
+        }
+    }
+
+    // MARK: - Outbox Management
+
+    func flushOutbox(for peerID: PeerID) {
+        guard let queued = outbox[peerID], !queued.isEmpty else { return }
+        SecureLogger.debug("Flushing outbox for \(peerID.id.prefix(8))… count=\(queued.count)", category: .session)
+        var remaining: [(content: String, nickname: String, messageID: String)] = []
         
-        guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else {
-            SecureLogger.log("⚠️ No Nostr identity available for acknowledgment", 
-                            category: SecureLogger.session, level: .warning)
-            return
+        for (content, nickname, messageID) in queued {
+            if let transport = transports.first(where: { $0.isPeerReachable(peerID) }) {
+                SecureLogger.debug("Outbox -> \(type(of: transport)) for \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+                transport.sendPrivateMessage(content, to: peerID, recipientNickname: nickname, messageID: messageID)
+            } else {
+                remaining.append((content, nickname, messageID))
+            }
         }
         
-        // Create acknowledgment message
-        let content = "DELIVERED:\(messageId)"
-        guard let event = try? NostrProtocol.createPrivateMessage(
-            content: content,
-            recipientPubkey: recipientNostrPubkey,
-            senderIdentity: senderIdentity
-        ) else {
-            SecureLogger.log("❌ Failed to create delivery acknowledgment", 
-                            category: SecureLogger.session, level: .error)
-            return
-        }
-        
-        // Send via relay
-        nostrRelay.sendEvent(event)
-    }
-    
-    private func cleanupOldMessages() {
-        let cutoff = Date().addingTimeInterval(-300) // 5 minutes
-        pendingMessages = pendingMessages.filter { $0.value.timestamp > cutoff }
-    }
-}
-
-// MARK: - Errors
-
-enum MessageRouterError: LocalizedError {
-    case peerNotReachable
-    case noNostrPublicKey
-    case noNostrIdentity
-    case transportFailed
-    case noNostrKey
-    case noIdentity
-    case encryptionFailed
-    
-    var errorDescription: String? {
-        switch self {
-        case .peerNotReachable:
-            return "Peer is not reachable via mesh or Nostr"
-        case .noNostrPublicKey:
-            return "Peer's Nostr public key is unknown"
-        case .noNostrIdentity:
-            return "No Nostr identity available"
-        case .transportFailed:
-            return "Failed to send message"
-        case .noNostrKey:
-            return "No Nostr key available for recipient"
-        case .noIdentity:
-            return "No identity available"
-        case .encryptionFailed:
-            return "Failed to encrypt message"
+        if remaining.isEmpty {
+            outbox.removeValue(forKey: peerID)
+        } else {
+            outbox[peerID] = remaining
         }
     }
+
+    func flushAllOutbox() {
+        for key in Array(outbox.keys) { flushOutbox(for: key) }
+    }
 }
-
-// MARK: - Notification Names
-
-extension Notification.Name {
-    static let nostrMessageReceived = Notification.Name("NostrMessageReceived")
-    static let messageDeliveryAcknowledged = Notification.Name("MessageDeliveryAcknowledged")
-    static let readReceiptReceived = Notification.Name("ReadReceiptReceived")
-    static let appDidBecomeActive = Notification.Name("AppDidBecomeActive")
-}
-

bitchat/Services/NetworkActivationService.swift

@@ -0,0 +1,114 @@
+import Foundation
+import BitLogger
+import Combine
+import Tor
+
+/// Coordinates when the app is allowed to start Tor and connect to Nostr relays.
+/// Policy: permit start when either location permissions are authorized OR
+/// there exists at least one mutual favorite. Otherwise, do not start.
+@MainActor
+final class NetworkActivationService: ObservableObject {
+    static let shared = NetworkActivationService()
+
+    @Published private(set) var activationAllowed: Bool = false
+    @Published private(set) var userTorEnabled: Bool = true
+
+    private var cancellables = Set<AnyCancellable>()
+    private var started = false
+    private let torPreferenceKey = "networkActivationService.userTorEnabled"
+    private var torAutoStartDesired: Bool = false
+
+    private init() {}
+
+    func start() {
+        guard !started else { return }
+        started = true
+
+        if let stored = UserDefaults.standard.object(forKey: torPreferenceKey) as? Bool {
+            userTorEnabled = stored
+        } else {
+            userTorEnabled = true
+        }
+
+        // Initial compute
+        let allowed = basePolicyAllowed()
+        activationAllowed = allowed
+        torAutoStartDesired = allowed && userTorEnabled
+        TorManager.shared.setAutoStartAllowed(torAutoStartDesired)
+        applyTorState(torDesired: torAutoStartDesired)
+        if allowed {
+            NostrRelayManager.shared.connect()
+        } else {
+            NostrRelayManager.shared.disconnect()
+        }
+
+        // React to location permission changes
+        LocationChannelManager.shared.$permissionState
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.reevaluate()
+            }
+            .store(in: &cancellables)
+
+        // React to mutual favorites changes
+        FavoritesPersistenceService.shared.$mutualFavorites
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.reevaluate()
+            }
+            .store(in: &cancellables)
+    }
+
+    func setUserTorEnabled(_ enabled: Bool) {
+        guard enabled != userTorEnabled else { return }
+        userTorEnabled = enabled
+        UserDefaults.standard.set(enabled, forKey: torPreferenceKey)
+        NotificationCenter.default.post(
+            name: .TorUserPreferenceChanged,
+            object: nil,
+            userInfo: ["enabled": enabled]
+        )
+        reevaluate()
+    }
+
+    private func reevaluate() {
+        let allowed = basePolicyAllowed()
+        let torDesired = allowed && userTorEnabled
+        let statusChanged = allowed != activationAllowed
+        let torChanged = torDesired != torAutoStartDesired
+        if statusChanged {
+            SecureLogger.info("NetworkActivationService: activationAllowed -> \(allowed)", category: .session)
+            activationAllowed = allowed
+        }
+        if statusChanged || torChanged {
+            torAutoStartDesired = torDesired
+            TorManager.shared.setAutoStartAllowed(torDesired)
+            applyTorState(torDesired: torDesired)
+        }
+
+        if allowed {
+            if torChanged {
+                // Reset relay sockets when switching transport path (Tor ↔︎ direct)
+                NostrRelayManager.shared.disconnect()
+            }
+            NostrRelayManager.shared.connect()
+        } else if statusChanged {
+            NostrRelayManager.shared.disconnect()
+        }
+    }
+
+    private func basePolicyAllowed() -> Bool {
+        let permOK = LocationChannelManager.shared.permissionState == .authorized
+        let hasMutual = !FavoritesPersistenceService.shared.mutualFavorites.isEmpty
+        return permOK || hasMutual
+    }
+
+    private func applyTorState(torDesired: Bool) {
+        TorURLSession.shared.setProxyMode(useTor: torDesired)
+        if torDesired {
+            TorManager.shared.startIfNeeded()
+        } else {
+            TorManager.shared.shutdownCompletely()
+        }
+    }
+}