Bound egress canary probes with a watchdog and cancel them on invalidate

The Tor egress self-check probe had no outer bound: the proxied session
sets waitsForConnectivity = true, which can defer the per-request timer
indefinitely, leaving a canary request bounded only by URLSession's
default 7-day resource timeout. Because verify() joins concurrent
callers on the in-flight task and invalidate() neither cancelled nor
cleared it, one hung probe wedged every subsequent verify() caller --
even across a Tor restart -- parking awaitingTorForConnections in
NostrRelayManager until process restart.

Fixes (liveness only; the fail-closed policy is unchanged):
- Race every probe against an independent async watchdog
  (probeTimeout, default 20s = the live probe's request timeout, via
  TorEgressVerifier.defaultProbeTimeout). On timeout the probe task is
  cancelled (cooperatively cancelling the underlying URLSessionTask),
  the verdict is the fail-closed .unreachable, and the in-flight slot
  is cleared so the next verify() starts fresh.
- invalidate() now cancels the in-flight probe and clears it (plus the
  throttle timestamp it already cleared), so Tor restart/dormant/
  shutdown genuinely resets the verifier.
- A probe generation counter keeps actor reentrancy safe: a cancelled/
  superseded probe cannot re-seed the throttle/cache that invalidate()
  just cleared or clobber a fresh probe's in-flight slot; its awaiting
  callers resolve promptly as false.

Concurrent-caller join semantics are preserved (one shared probe), and
the race resolves exactly once behind an NSLock never held across an
await. Tests cover the hung-probe timeout bound, invalidate-cancels-
in-flight, post-restart recovery, and the shared-probe invariant, all
with the injected probe/clock harness (no real network).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/arti-provenance.yml

@@ -0,0 +1,85 @@
+name: Arti Binary Provenance
+
+# The Arti xcframework is a vendored binary; these checks turn the policy in
+# docs/ARTI-BINARY-PROVENANCE.md into an enforced gate:
+#  1. The checked-in binary must match the hash manifest in the provenance doc.
+#  2. A PR that changes the binary must also change at least one provenance
+#     input (Rust source, lockfile, build script, or the doc itself).
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "localPackages/Arti/**"
+      - "docs/ARTI-BINARY-PROVENANCE.md"
+  pull_request:
+    paths:
+      - "localPackages/Arti/**"
+      - "docs/ARTI-BINARY-PROVENANCE.md"
+
+jobs:
+  verify-hashes:
+    name: Verify xcframework hashes against provenance doc
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Compare artifact hashes with manifest
+        run: |
+          set -euo pipefail
+          doc="docs/ARTI-BINARY-PROVENANCE.md"
+
+          # Extract the manifest: lines of "<sha256>  <path>" from the doc.
+          grep -E '^[0-9a-f]{64}  localPackages/Arti/Frameworks/arti\.xcframework/' "$doc" \
+            | sort -k2 > expected.txt
+
+          if [ ! -s expected.txt ]; then
+            echo "::error::No hash manifest found in $doc"
+            exit 1
+          fi
+
+          # Hash the same file set the doc documents.
+          find localPackages/Arti/Frameworks/arti.xcframework -maxdepth 3 -type f -print0 \
+            | sort -z | xargs -0 sha256sum | sed 's/  \.\//  /' | sort -k2 > actual.txt
+
+          if ! diff -u expected.txt actual.txt; then
+            echo "::error::Checked-in arti.xcframework does not match the manifest in $doc. If the binary change is intentional, rebuild per the doc and update the manifest in the same PR."
+            exit 1
+          fi
+          echo "All $(wc -l < actual.txt) artifact hashes match the provenance manifest."
+
+  require-provenance-evidence:
+    name: Binary changes must ship with provenance inputs
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: Check changed files
+        run: |
+          set -euo pipefail
+          base="origin/${{ github.base_ref }}"
+          git fetch --no-tags --depth=1 origin "${{ github.base_ref }}"
+          changed=$(git diff --name-only "$base"...HEAD)
+          echo "Changed files:"
+          echo "$changed"
+
+          if ! echo "$changed" | grep -q '^localPackages/Arti/Frameworks/arti\.xcframework/'; then
+            echo "No binary artifact changes; nothing to verify."
+            exit 0
+          fi
+
+          if echo "$changed" | grep -Eq '^(localPackages/Arti/(Cargo\.(toml|lock)|build-ios\.sh|arti-bitchat/)|docs/ARTI-BINARY-PROVENANCE\.md)'; then
+            echo "Binary change is accompanied by provenance inputs."
+            exit 0
+          fi
+
+          echo "::error::arti.xcframework changed without matching source, lockfile, build-script, or provenance-doc changes. See docs/ARTI-BINARY-PROVENANCE.md (\"Do not accept an xcframework-only update\")."
+          exit 1

.github/workflows/swift-tests.yml

@@ -10,6 +10,9 @@ jobs:
   test:
     name: Run Swift Tests (${{ matrix.name }})
     runs-on: macos-latest
+    # A hung test must fail fast, not hold a runner for GitHub's 360-minute
+    # default (observed: intermittent app-suite hangs starving the queue).
+    timeout-minutes: 15
 
     strategy:
       fail-fast: false # Don't cancel other matrix jobs when one fails
@@ -21,26 +24,124 @@ jobs:
             path: localPackages/BitLogger
           - name: BitFoundation
             path: localPackages/BitFoundation
-          - name: Noise
-            path: localPackages/Noise
-          - name: Nostr
-            path: localPackages/Nostr
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v5
 
-      - name: Set up Swift
-        uses: swift-actions/setup-swift@v2
+      # Use the Xcode-bundled Swift toolchain: it always matches the SDK on
+      # the runner image. A standalone swift.org toolchain (setup-swift) broke
+      # whenever the image's Xcode moved ahead of it ("this SDK is not
+      # supported by the compiler").
+      - name: Note toolchain version (cache key)
+        id: swift-version
+        run: echo "version=$(swift --version 2>/dev/null | head -1 | shasum | cut -c1-12)" >> "$GITHUB_OUTPUT"
 
       - name: Cache build artifacts
         uses: actions/cache@v4
         with:
           path: ${{ matrix.path }}/.build
-          key: ${{ runner.os }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/*.swift', matrix.path), format('{0}/**/Package.resolved', matrix.path)) }}
+          key: ${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/*.swift', matrix.path), format('{0}/**/Package.resolved', matrix.path)) }}
           restore-keys: |
-            ${{ runner.os }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/Package.resolved', matrix.path)) }}
-            ${{ runner.os }}-${{ matrix.name }}-
+            ${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-${{ hashFiles(format('{0}/**/Package.resolved', matrix.path)) }}
+            ${{ runner.os }}-${{ steps.swift-version.outputs.version }}-${{ matrix.name }}-
+
+      - name: Build tests
+        # Built separately so the hang watchdog below times only test
+        # execution: a cold-cache coverage build on a slow runner can
+        # legitimately take several minutes, and is already bounded by the
+        # 15-minute job timeout.
+        run: swift build --build-tests --enable-code-coverage --package-path ${{ matrix.path }}
 
       - name: Run Tests
-        run: swift test --parallel --quiet --package-path ${{ matrix.path }}
+        # Perf benchmarks are excluded here and run in their own serial step
+        # below: measuring while parallel test processes contend for cores
+        # produces noisy numbers, and the XCTest measure machinery has hung
+        # intermittently under parallel workers on loaded runners. Excluded
+        # via --skip (not just the env guard): every app run since the
+        # baselines landed timed out at the 15-minute job limit with the
+        # baseline tests dispatched into the parallel phase.
+        #
+        # The watchdog samples any still-running test processes after 5
+        # minutes (the suite passes in seconds when healthy; the build is
+        # done by this step) and kills the run, so a hang fails fast with
+        # stacks in the log instead of a silent timeout.
+        env:
+          BITCHAT_SKIP_PERF_BASELINES: "1"
+        run: |
+          swift test --skip-build --parallel --quiet --enable-code-coverage \
+            --skip PerformanceBaselineTests \
+            --package-path ${{ matrix.path }} &
+          test_pid=$!
+          (
+            sleep 300
+            if kill -0 "$test_pid" 2>/dev/null; then
+              echo "::group::Tests still running after 5 minutes — sampling before kill"
+              for pid in $(pgrep -if 'swiftpm-testing|xctest|PackageTests' || true); do
+                echo "--- sample of pid $pid ---"
+                sample "$pid" 5 2>/dev/null || true
+              done
+              echo "::endgroup::"
+              pkill -KILL -P "$test_pid" 2>/dev/null || true
+              kill -KILL "$test_pid" 2>/dev/null || true
+            fi
+          ) &
+          watchdog_pid=$!
+          wait "$test_pid" && status=0 || status=$?
+          kill "$watchdog_pid" 2>/dev/null || true
+          exit "$status"
+
+      # Benchmarks run serially on an otherwise idle runner for stable
+      # numbers; BITCHAT_PERF_LOG captures the PERF[...] lines for the gate.
+      - name: Run performance benchmarks (serial)
+        if: matrix.name == 'app'
+        timeout-minutes: 6
+        env:
+          BITCHAT_PERF_LOG: ${{ github.workspace }}/perf-output.log
+        run: swift test --quiet --filter PerformanceBaselineTests
+
+      # Order-of-magnitude performance regression gate. Floors are deliberately
+      # generous (see bitchatTests/Performance/perf-floors.json) so this
+      # catches algorithmic regressions, never runner variance.
+      - name: Performance floor gate
+        if: matrix.name == 'app'
+        run: ./scripts/check-perf-floors.sh perf-output.log
+
+      # Informational only: surfaces per-file and total line coverage in the
+      # job log so coverage trends are visible on every PR. No thresholds —
+      # this must never be the reason a build goes red.
+      - name: Coverage summary
+        run: |
+          BIN_PATH=$(swift build --show-bin-path --package-path ${{ matrix.path }})
+          PROF="$BIN_PATH/codecov/default.profdata"
+          XCTEST=$(find "$BIN_PATH" -maxdepth 1 -name '*.xctest' | head -1)
+          BINARY="$XCTEST/Contents/MacOS/$(basename "$XCTEST" .xctest)"
+          if [ -f "$PROF" ] && [ -f "$BINARY" ]; then
+            xcrun llvm-cov report "$BINARY" -instr-profile "$PROF" \
+              -ignore-filename-regex='(Tests|\.build|checkouts|Mocks|_PreviewHelpers)' || true
+          else
+            echo "No coverage data found; skipping summary."
+          fi
+
+  # SPM tests above only compile the macOS slice; this job covers the
+  # iOS-conditional code paths (UIKit, CoreBluetooth restoration, etc.).
+  ios-build:
+    name: Build iOS app (simulator)
+    runs-on: macos-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Build iOS (simulator, no signing)
+        # arm64 only: the vendored arti.xcframework has no x86_64 simulator slice.
+        run: |
+          set -o pipefail
+          xcodebuild -project bitchat.xcodeproj \
+            -scheme "bitchat (iOS)" \
+            -sdk iphonesimulator \
+            -destination 'generic/platform=iOS Simulator' \
+            ARCHS=arm64 \
+            CODE_SIGNING_ALLOWED=NO \
+            build

Configs/Release.xcconfig

@@ -1,4 +1,4 @@
-MARKETING_VERSION = 1.5.1
+MARKETING_VERSION = 1.5.3
 CURRENT_PROJECT_VERSION = 1
 
 IPHONEOS_DEPLOYMENT_TARGET = 16.0

PRIVACY_POLICY.md

@@ -1,6 +1,6 @@
 # bitchat Privacy Policy
 
-*Last updated: January 2025*
+*Last updated: June 2026*
 
 ## Our Commitment
 
@@ -9,7 +9,7 @@ bitchat is designed with privacy as its foundation. We believe private communica
 ## Summary
 
 - **No personal data collection** - We don't collect names, emails, or phone numbers
-- **No servers** - Everything happens on your device and through peer-to-peer connections
+- **No accounts or company servers** - Mesh chat works peer-to-peer; optional Nostr features use public or user-selected relays
 - **No tracking** - We have no analytics, telemetry, or user tracking
 - **Open source** - You can verify these claims by reading our code
 
@@ -17,11 +17,11 @@ bitchat is designed with privacy as its foundation. We believe private communica
 
 ### On Your Device Only
 
-1. **Identity Key** 
-   - A cryptographic key generated on first launch
+1. **Identity Keys**
+   - Cryptographic private keys generated on first launch or when optional Nostr identities are created
    - Stored locally in your device's secure storage
    - Allows you to maintain "favorite" relationships across app restarts
-   - Never leaves your device
+   - Private keys never leave your device; public keys are shared when needed for messaging
 
 2. **Nickname**
    - The display name you choose (or auto-generated)
@@ -38,12 +38,19 @@ bitchat is designed with privacy as its foundation. We believe private communica
    - Stored only on your device
    - Allows you to recognize these peers in future sessions
 
+5. **Optional Location Channel State**
+   - Your selected geohash channel, bookmarked geohashes, teleport flags, and bookmark display names
+   - Stored locally on your device so the location-channel UI can restore your choices
+   - Per-geohash Nostr identities are derived locally from a device seed stored in secure storage
+   - Exact latitude and longitude are not persisted by bitchat
+
 ### Temporary Session Data
 
 During each session, bitchat temporarily maintains:
 - Active peer connections (forgotten when app closes)
 - Routing information for message delivery
 - Cached messages for offline peers (12 hours max)
+- Your current location while optional location channels are enabled, used locally to compute geohash channels and friendly place names
 
 ## What Information is Shared
 
@@ -62,13 +69,21 @@ When you join a password-protected room:
 - Your nickname appears in the member list
 - Room owners can see you've joined
 
+### With Nostr Relays (Optional Features)
+
+If you enable Nostr-backed features:
+- Private fallback messages to mutual favorites are sent as encrypted NIP-17 gift wraps. Relays can see event metadata, but not message content.
+- Public location-channel messages, location notes, and presence are scoped with geohash tags. Relays and other participants can see the geohash tag, event kind, timestamp, and public key used for that geohash.
+- Exact GPS coordinates are not included in Nostr events by bitchat. The geohash precision you choose can still reveal an approximate area, from region-level to building-level.
+- Automatic presence heartbeats are limited to low-precision geohashes (region, province, and city). More precise geohash posts happen only when you use those channels or location notes.
+
 ## What We DON'T Do
 
 bitchat **never**:
 - Collects personal information
-- Tracks your location
-- Stores data on servers
-- Shares data with third parties
+- Sells or shares your exact GPS location
+- Stores data on servers we operate
+- Sells your data to advertisers or data brokers
 - Uses analytics or telemetry
 - Creates user profiles
 - Requires registration
@@ -84,19 +99,27 @@ All private messages use end-to-end encryption:
 ## Your Rights
 
 You have complete control:
-- **Delete Everything**: Triple-tap the logo to instantly wipe all data
-- **Leave Anytime**: Close the app and your presence disappears
-- **No Account**: Nothing to delete from servers because there are none
-- **Portability**: Your data never leaves your device unless you export it
+- **Delete Local State**: Triple-tap the logo to instantly wipe local keys, sessions, caches, and preferences
+- **Leave Anytime**: Close the app and local presence stops; relay-backed presence ages out
+- **No Account**: No account record exists for you to delete from us
+- **Portability**: Your local state stays on your device unless you send messages, use optional relay-backed features, or export it
 
 ## Bluetooth & Permissions
 
 bitchat requires Bluetooth permission to function:
 - Used only for peer-to-peer communication
-- No location data is accessed or stored
 - Bluetooth is not used for tracking
 - You can revoke this permission at any time in system settings
 
+## Location Permission
+
+Location permission is optional and is used only for location channels:
+- Used to compute local geohash channels and display names
+- Requested as when-in-use permission
+- Exact coordinates are not shared in messages or stored by bitchat
+- Selected and bookmarked geohashes may persist locally until you remove them, use panic wipe, or delete the app
+- You can revoke this permission at any time in system settings
+
 ## Children's Privacy
 
 bitchat does not knowingly collect information from children. The app has no age verification because it collects no personal information from anyone.
@@ -106,12 +129,15 @@ bitchat does not knowingly collect information from children. The app has no age
 - **Messages**: Deleted from memory when app closes (unless room retention is enabled)
 - **Identity Key**: Persists until you delete the app
 - **Favorites**: Persist until you remove them or delete the app
+- **Location channel choices**: Selected/bookmarked geohashes persist locally until removed, panic-wiped, or the app is deleted
+- **Nostr relay data**: Public geohash events and encrypted gift wraps may be retained by relays according to each relay's policy
 - **Everything Else**: Exists only during active sessions
 
 ## Security Measures
 
 - All communication is encrypted
-- No data transmitted to servers (there are none)
+- No accounts or company servers
+- Optional Nostr relays receive only the events needed for Nostr-backed private fallback or public location channels
 - Open source code for public audit
 - Regular security updates
 - Cryptographic signatures prevent tampering
@@ -121,7 +147,7 @@ bitchat does not knowingly collect information from children. The app has no age
 If we update this policy:
 - The "Last updated" date will change
 - The updated policy will be included in the app
-- No retroactive changes can affect data (since we don't collect any)
+- No retroactive changes can make us collect data already held only in your app
 
 ## Contact
 
@@ -132,7 +158,7 @@ bitchat is an open source project. For privacy questions:
 
 ## Philosophy
 
-Privacy isn't just a feature—it's the entire point. bitchat proves that modern communication doesn't require surrendering your privacy. No accounts, no servers, no surveillance. Just people talking freely.
+Privacy isn't just a feature—it's the entire point. bitchat proves that modern communication doesn't require surrendering your privacy. No accounts, no company servers, no analytics. Just people talking freely.
 
 ---
 

Package.swift

@@ -17,10 +17,8 @@ let package = Package(
     ],
     dependencies:[
         .package(path: "localPackages/Arti"),
-        .package(path: "localPackages/Noise"),
         .package(path: "localPackages/BitFoundation"),
         .package(path: "localPackages/BitLogger"),
-        .package(path: "localPackages/Nostr"),
         .package(url: "https://github.com/21-DOT-DEV/swift-secp256k1", exact: "0.21.1")
     ],
     targets: [
@@ -30,8 +28,6 @@ let package = Package(
                 .product(name: "P256K", package: "swift-secp256k1"),
                 .product(name: "BitFoundation", package: "BitFoundation"),
                 .product(name: "BitLogger", package: "BitLogger"),
-                .product(name: "Noise", package: "Noise"),
-                .product(name: "Nostr", package: "Nostr"),
                 .product(name: "Tor", package: "Arti")
             ],
             path: "bitchat",
@@ -52,16 +48,22 @@ let package = Package(
             name: "bitchatTests",
             dependencies: [
                 "bitchat",
-                .product(name: "BitFoundation", package: "BitFoundation"),
-                .product(name: "Nostr", package: "Nostr")
+                .product(name: "BitFoundation", package: "BitFoundation")
             ],
             path: "bitchatTests",
             exclude: [
                 "Info.plist",
-                "README.md"
+                "README.md",
+                // CI perf gate data (read by scripts/check-perf-floors.sh),
+                // not a test resource.
+                "Performance/perf-floors.json"
             ],
             resources: [
-                .process("Localization")
+                .process("Localization"),
+                // Only the vector fixture: declaring the whole "Noise"
+                // directory would claim its .swift test files as resources
+                // and silently drop them from compilation.
+                .process("Noise/NoiseTestVectors.json")
             ]
         )
     ]

bitchat.xcodeproj/project.pbxproj

@@ -10,10 +10,6 @@
 		17901751FD8010AFC8E750F2 /* bitchatShareExtension.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = 61F92EBA29C47C0FCC482F1F /* bitchatShareExtension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
 		3EE336D150427F736F32B56C /* P256K in Frameworks */ = {isa = PBXBuildFile; productRef = B1D9136AA0083366353BFA2F /* P256K */; };
 		885BBED78092484A5B069461 /* P256K in Frameworks */ = {isa = PBXBuildFile; productRef = 4EB6BA1B8464F1EA38F4E286 /* P256K */; };
-		A63163B62F80CB2500B8B128 /* Noise in Frameworks */ = {isa = PBXBuildFile; productRef = A63163B52F80CB2500B8B128 /* Noise */; };
-		A63163B82F80CB2D00B8B128 /* Noise in Frameworks */ = {isa = PBXBuildFile; productRef = A63163B72F80CB2D00B8B128 /* Noise */; };
-		A63180832F8103AB00B8B128 /* Nostr in Frameworks */ = {isa = PBXBuildFile; productRef = A63180822F8103AB00B8B128 /* Nostr */; };
-		A63180852F8103B600B8B128 /* Nostr in Frameworks */ = {isa = PBXBuildFile; productRef = A63180842F8103B600B8B128 /* Nostr */; };
 		A6BCF9482F80953E001CF9B9 /* BitFoundation in Frameworks */ = {isa = PBXBuildFile; productRef = A6BCF9472F80953E001CF9B9 /* BitFoundation */; };
 		A6BCF94A2F809550001CF9B9 /* BitFoundation in Frameworks */ = {isa = PBXBuildFile; productRef = A6BCF9492F809550001CF9B9 /* BitFoundation */; };
 		A6E3E5702E77036A0032EA8A /* BitLogger in Frameworks */ = {isa = PBXBuildFile; productRef = A6E3E56F2E77036A0032EA8A /* BitLogger */; };
@@ -160,9 +156,7 @@
 			isa = PBXFrameworksBuildPhase;
 			files = (
 				A6E3E5722E7703760032EA8A /* BitLogger in Frameworks */,
-				A63163B82F80CB2D00B8B128 /* Noise in Frameworks */,
 				3EE336D150427F736F32B56C /* P256K in Frameworks */,
-				A63180852F8103B600B8B128 /* Nostr in Frameworks */,
 				A6E3EA812E7706A80032EA8A /* Tor in Frameworks */,
 				A6BCF94A2F809550001CF9B9 /* BitFoundation in Frameworks */,
 			);
@@ -171,9 +165,7 @@
 			isa = PBXFrameworksBuildPhase;
 			files = (
 				A6E3E5702E77036A0032EA8A /* BitLogger in Frameworks */,
-				A63163B62F80CB2500B8B128 /* Noise in Frameworks */,
 				885BBED78092484A5B069461 /* P256K in Frameworks */,
-				A63180832F8103AB00B8B128 /* Nostr in Frameworks */,
 				A6E3EA7F2E7706720032EA8A /* Tor in Frameworks */,
 				A6BCF9482F80953E001CF9B9 /* BitFoundation in Frameworks */,
 			);
@@ -236,8 +228,6 @@
 				A6E3E5712E7703760032EA8A /* BitLogger */,
 				A6E3EA802E7706A80032EA8A /* Tor */,
 				A6BCF9492F809550001CF9B9 /* BitFoundation */,
-				A63163B72F80CB2D00B8B128 /* Noise */,
-				A63180842F8103B600B8B128 /* Nostr */,
 			);
 			productName = bitchat_macOS;
 			productReference = 8F3A7C058C2C8E1A06C8CF8B /* bitchat.app */;
@@ -319,8 +309,6 @@
 				A6E3E56F2E77036A0032EA8A /* BitLogger */,
 				A6E3EA7E2E7706720032EA8A /* Tor */,
 				A6BCF9472F80953E001CF9B9 /* BitFoundation */,
-				A63163B52F80CB2500B8B128 /* Noise */,
-				A63180822F8103AB00B8B128 /* Nostr */,
 			);
 			productName = bitchat_iOS;
 			productReference = 96D0D41CA19EE5A772AA8434 /* bitchat.app */;
@@ -333,7 +321,7 @@
 			isa = PBXProject;
 			attributes = {
 				BuildIndependentTargetsInParallel = YES;
-				LastUpgradeCheck = 1640;
+				LastUpgradeCheck = 2650;
 			};
 			buildConfigurationList = 3EA424CBD51200895D361189 /* Build configuration list for PBXProject "bitchat" */;
 			developmentRegion = en;
@@ -363,8 +351,6 @@
 				A6E3E56E2E77036A0032EA8A /* XCLocalSwiftPackageReference "localPackages/BitLogger" */,
 				A6E3EA7D2E7706720032EA8A /* XCLocalSwiftPackageReference "localPackages/Arti" */,
 				A6BCF9462F80953E001CF9B9 /* XCLocalSwiftPackageReference "localPackages/BitFoundation" */,
-				A63163B42F80CB2500B8B128 /* XCLocalSwiftPackageReference "localPackages/Noise" */,
-				A63180812F8103AB00B8B128 /* XCLocalSwiftPackageReference "localPackages/Nostr" */,
 			);
 			preferredProjectObjectVersion = 90;
 			projectDirPath = "";
@@ -460,7 +446,6 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGNING_REQUIRED = YES;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatTests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = "$(IPHONEOS_DEPLOYMENT_TARGET)";
 				LD_RUNPATH_SEARCH_PATHS = (
@@ -485,7 +470,6 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGNING_REQUIRED = YES;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatTests/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = "$(IPHONEOS_DEPLOYMENT_TARGET)";
 				LD_RUNPATH_SEARCH_PATHS = (
@@ -512,7 +496,6 @@
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				COMBINE_HIDPI_IMAGES = YES;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -537,7 +520,6 @@
 				CODE_SIGN_ALLOW_ENTITLEMENTS_MODIFICATION = YES;
 				CODE_SIGN_ENTITLEMENTS = bitchatShareExtension/bitchatShareExtension.entitlements;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatShareExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
 				IPHONEOS_DEPLOYMENT_TARGET = "$(IPHONEOS_DEPLOYMENT_TARGET)";
@@ -570,7 +552,6 @@
 				CODE_SIGN_ENTITLEMENTS = bitchat/bitchat.entitlements;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				DEVELOPMENT_ASSET_PATHS = bitchat/_PreviewHelpers;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_PREVIEWS = NO;
 				INFOPLIST_FILE = bitchat/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
@@ -580,7 +561,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.5.1;
+				MARKETING_VERSION = 1.5.3;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_BUNDLE_IDENTIFIER)";
 				PRODUCT_NAME = bitchat;
 				SDKROOT = iphoneos;
@@ -604,7 +585,6 @@
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				COMBINE_HIDPI_IMAGES = YES;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatTests/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -631,7 +611,6 @@
 				CODE_SIGN_ENTITLEMENTS = bitchat/bitchat.entitlements;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				DEVELOPMENT_ASSET_PATHS = bitchat/_PreviewHelpers;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = bitchat/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
@@ -641,7 +620,7 @@
 					"$(inherited)",
 					"@executable_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.5.1;
+				MARKETING_VERSION = 1.5.3;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_BUNDLE_IDENTIFIER)";
 				PRODUCT_NAME = bitchat;
 				SDKROOT = iphoneos;
@@ -667,7 +646,6 @@
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				COMBINE_HIDPI_IMAGES = YES;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_PREVIEWS = YES;
 				INFOPLIST_FILE = bitchat/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
@@ -677,7 +655,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = "$(MACOSX_DEPLOYMENT_TARGET)";
-				MARKETING_VERSION = 1.5.1;
+				MARKETING_VERSION = 1.5.3;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_BUNDLE_IDENTIFIER)";
 				PRODUCT_NAME = bitchat;
 				REGISTER_APP_GROUPS = YES;
@@ -690,6 +668,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
@@ -723,6 +702,7 @@
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -740,6 +720,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 				SWIFT_VERSION = "$(SWIFT_VERSION)";
@@ -759,7 +740,6 @@
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
 				COMBINE_HIDPI_IMAGES = YES;
 				DEAD_CODE_STRIPPING = YES;
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_PREVIEWS = NO;
 				INFOPLIST_FILE = bitchat/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
@@ -769,7 +749,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = "$(MACOSX_DEPLOYMENT_TARGET)";
-				MARKETING_VERSION = 1.5.1;
+				MARKETING_VERSION = 1.5.3;
 				PRODUCT_BUNDLE_IDENTIFIER = "$(PRODUCT_BUNDLE_IDENTIFIER)";
 				PRODUCT_NAME = bitchat;
 				REGISTER_APP_GROUPS = YES;
@@ -782,6 +762,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
@@ -815,6 +796,7 @@
 				CURRENT_PROJECT_VERSION = "$(CURRENT_PROJECT_VERSION)";
 				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = dwarf;
+				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -839,6 +821,7 @@
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				STRING_CATALOG_GENERATE_SYMBOLS = NO;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = "$(SWIFT_VERSION)";
@@ -855,7 +838,6 @@
 				CODE_SIGN_ALLOW_ENTITLEMENTS_MODIFICATION = YES;
 				CODE_SIGN_ENTITLEMENTS = bitchatShareExtension/bitchatShareExtension.entitlements;
 				CODE_SIGN_STYLE = "$(CODE_SIGN_STYLE)";
-				DEVELOPMENT_TEAM = "$(DEVELOPMENT_TEAM)";
 				INFOPLIST_FILE = bitchatShareExtension/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = bitchat;
 				IPHONEOS_DEPLOYMENT_TARGET = "$(IPHONEOS_DEPLOYMENT_TARGET)";
@@ -930,14 +912,6 @@
 /* End XCConfigurationList section */
 
 /* Begin XCLocalSwiftPackageReference section */
-		A63163B42F80CB2500B8B128 /* XCLocalSwiftPackageReference "localPackages/Noise" */ = {
-			isa = XCLocalSwiftPackageReference;
-			relativePath = localPackages/Noise;
-		};
-		A63180812F8103AB00B8B128 /* XCLocalSwiftPackageReference "localPackages/Nostr" */ = {
-			isa = XCLocalSwiftPackageReference;
-			relativePath = localPackages/Nostr;
-		};
 		A6BCF9462F80953E001CF9B9 /* XCLocalSwiftPackageReference "localPackages/BitFoundation" */ = {
 			isa = XCLocalSwiftPackageReference;
 			relativePath = localPackages/BitFoundation;
@@ -969,24 +943,6 @@
 			package = B8C407587481BBB190741C93 /* XCRemoteSwiftPackageReference "swift-secp256k1" */;
 			productName = P256K;
 		};
-		A63163B52F80CB2500B8B128 /* Noise */ = {
-			isa = XCSwiftPackageProductDependency;
-			productName = Noise;
-		};
-		A63163B72F80CB2D00B8B128 /* Noise */ = {
-			isa = XCSwiftPackageProductDependency;
-			package = A63163B42F80CB2500B8B128 /* XCLocalSwiftPackageReference "localPackages/Noise" */;
-			productName = Noise;
-		};
-		A63180822F8103AB00B8B128 /* Nostr */ = {
-			isa = XCSwiftPackageProductDependency;
-			productName = Nostr;
-		};
-		A63180842F8103B600B8B128 /* Nostr */ = {
-			isa = XCSwiftPackageProductDependency;
-			package = A63180812F8103AB00B8B128 /* XCLocalSwiftPackageReference "localPackages/Nostr" */;
-			productName = Nostr;
-		};
 		A6BCF9472F80953E001CF9B9 /* BitFoundation */ = {
 			isa = XCSwiftPackageProductDependency;
 			productName = BitFoundation;

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

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1640"
+   LastUpgradeVersion = "2650"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

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

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1640"
+   LastUpgradeVersion = "2650"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

bitchat/App/AppArchitecture.swift

@@ -0,0 +1,102 @@
+import BitFoundation
+import Combine
+import Foundation
+
+enum SharedContentKind: String, Sendable, Equatable {
+    case text
+    case url
+}
+
+enum RuntimeScenePhase: String, Sendable, Equatable {
+    case active
+    case inactive
+    case background
+}
+
+enum TorLifecycleEvent: String, Sendable, Equatable {
+    case willStart
+    case willRestart
+    case didBecomeReady
+    case preferenceChanged
+}
+
+enum AppEvent: Sendable, Equatable {
+    case launched
+    case startupCompleted
+    case scenePhaseChanged(RuntimeScenePhase)
+    case openedURL(String)
+    case sharedContentAccepted(SharedContentKind)
+    case notificationOpened(peerID: PeerID?)
+    case deepLinkOpened(String)
+    case torLifecycleChanged(TorLifecycleEvent)
+    case nostrRelayConnectionChanged(Bool)
+    case terminationRequested
+}
+
+actor AppEventStream {
+    private var continuations: [UUID: AsyncStream<AppEvent>.Continuation] = [:]
+
+    func stream() -> AsyncStream<AppEvent> {
+        let id = UUID()
+        return AsyncStream { continuation in
+            continuations[id] = continuation
+            continuation.onTermination = { [id] _ in
+                Task {
+                    await self.removeContinuation(id)
+                }
+            }
+        }
+    }
+
+    func emit(_ event: AppEvent) {
+        for continuation in continuations.values {
+            continuation.yield(event)
+        }
+    }
+
+    func finish() {
+        for continuation in continuations.values {
+            continuation.finish()
+        }
+        continuations.removeAll()
+    }
+
+    private func removeContinuation(_ id: UUID) {
+        continuations.removeValue(forKey: id)
+    }
+}
+
+/// Identity key for a direct conversation. Equality and hashing use the
+/// canonical `id` only; `routingPeerID` carries the transport-level peer ID
+/// the conversation is keyed under (see `ConversationID.directPeer`).
+struct PeerHandle: Sendable, Identifiable {
+    let id: String
+    let routingPeerID: PeerID
+}
+
+extension PeerHandle: Equatable {
+    static func == (lhs: PeerHandle, rhs: PeerHandle) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+extension PeerHandle: Hashable {
+    func hash(into hasher: inout Hasher) {
+        hasher.combine(id)
+    }
+}
+
+enum ConversationID: Hashable, Sendable {
+    case mesh
+    case geohash(String)
+    case direct(PeerHandle)
+
+    init(channelID: ChannelID) {
+        switch channelID {
+        case .mesh:
+            self = .mesh
+        case .location(let channel):
+            self = .geohash(channel.geohash.lowercased())
+        }
+    }
+}

bitchat/App/AppChromeModel.swift

@@ -0,0 +1,100 @@
+import BitFoundation
+import Combine
+import CoreBluetooth
+import Foundation
+
+@MainActor
+final class AppChromeModel: ObservableObject {
+    @Published private(set) var hasUnreadPrivateMessages = false
+    @Published var nickname: String
+    @Published var showingFingerprintFor: PeerID?
+    @Published var isAppInfoPresented = false
+    @Published var isLocationChannelsSheetPresented = false
+    @Published var showBluetoothAlert = false
+    @Published var bluetoothAlertMessage = ""
+    @Published var bluetoothState: CBManagerState = .unknown
+    @Published var showScreenshotPrivacyWarning = false
+
+    private let chatViewModel: ChatViewModel
+    private var cancellables = Set<AnyCancellable>()
+
+    init(chatViewModel: ChatViewModel, privateInboxModel: PrivateInboxModel) {
+        self.chatViewModel = chatViewModel
+        self.nickname = chatViewModel.nickname
+
+        bind(privateInboxModel: privateInboxModel)
+    }
+
+    var shouldSuppressScreenshotNotification: Bool {
+        isLocationChannelsSheetPresented || isAppInfoPresented
+    }
+
+    func setNickname(_ nickname: String) {
+        self.nickname = nickname
+        if chatViewModel.nickname != nickname {
+            chatViewModel.nickname = nickname
+        }
+    }
+
+    func validateAndSaveNickname() {
+        chatViewModel.validateAndSaveNickname()
+        if nickname != chatViewModel.nickname {
+            nickname = chatViewModel.nickname
+        }
+    }
+
+    func openMostRelevantPrivateChat() {
+        chatViewModel.openMostRelevantPrivateChat()
+    }
+
+    func showFingerprint(for peerID: PeerID) {
+        showingFingerprintFor = peerID
+    }
+
+    func clearFingerprint() {
+        showingFingerprintFor = nil
+    }
+
+    func presentAppInfo() {
+        isAppInfoPresented = true
+    }
+
+    func triggerScreenshotPrivacyWarning() {
+        showScreenshotPrivacyWarning = true
+    }
+
+    func panicClearAllData() {
+        chatViewModel.panicClearAllData()
+    }
+
+    private func bind(privateInboxModel: PrivateInboxModel) {
+        privateInboxModel.$unreadPeerIDs
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] unreadPeerIDs in
+                self?.hasUnreadPrivateMessages = !unreadPeerIDs.isEmpty
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.$nickname
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] nickname in
+                guard let self, self.nickname != nickname else { return }
+                self.nickname = nickname
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.$showBluetoothAlert
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$showBluetoothAlert)
+
+        chatViewModel.$bluetoothAlertMessage
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$bluetoothAlertMessage)
+
+        chatViewModel.$bluetoothState
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$bluetoothState)
+
+        hasUnreadPrivateMessages = !privateInboxModel.unreadPeerIDs.isEmpty
+    }
+}

bitchat/App/AppRuntime.swift

@@ -0,0 +1,388 @@
+import BitFoundation
+import Combine
+import Foundation
+import SwiftUI
+import Tor
+import UserNotifications
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
+
+@MainActor
+final class AppRuntime: ObservableObject {
+    let chatViewModel: ChatViewModel
+    let events = AppEventStream()
+    /// Single source of truth for conversation message state and selection
+    /// (docs/CONVERSATION-STORE-DESIGN.md). Owned here; the feature models
+    /// and `ChatViewModel` observe and mutate it through its intent API.
+    let conversations: ConversationStore
+    let peerIdentityStore: PeerIdentityStore
+    let locationPresenceStore: LocationPresenceStore
+    let publicChatModel: PublicChatModel
+    let privateInboxModel: PrivateInboxModel
+    let privateConversationModel: PrivateConversationModel
+    let verificationModel: VerificationModel
+    let conversationUIModel: ConversationUIModel
+    let locationChannelsModel: LocationChannelsModel
+    let peerListModel: PeerListModel
+    let appChromeModel: AppChromeModel
+
+    private let idBridge: NostrIdentityBridge
+    private var cancellables = Set<AnyCancellable>()
+    private var started = false
+    private var lastNostrRelayConnectedState = false
+    private var didHandleInitialNostrConnection = false
+
+    #if os(iOS)
+    private var didHandleInitialActive = false
+    private var didEnterBackground = false
+    #endif
+
+    init(
+        keychain: KeychainManagerProtocol = KeychainManager(),
+        idBridge: NostrIdentityBridge = NostrIdentityBridge()
+    ) {
+        self.idBridge = idBridge
+        let conversations = ConversationStore()
+        let peerIdentityStore = PeerIdentityStore()
+        let locationPresenceStore = LocationPresenceStore()
+        let locationManager = LocationChannelManager.shared
+        self.conversations = conversations
+        self.peerIdentityStore = peerIdentityStore
+        self.locationPresenceStore = locationPresenceStore
+        self.chatViewModel = ChatViewModel(
+            keychain: keychain,
+            idBridge: idBridge,
+            identityManager: SecureIdentityStateManager(keychain),
+            conversations: conversations,
+            peerIdentityStore: peerIdentityStore,
+            locationPresenceStore: locationPresenceStore,
+            locationManager: locationManager
+        )
+        self.publicChatModel = PublicChatModel(conversations: conversations)
+        self.privateInboxModel = PrivateInboxModel(conversations: conversations)
+        self.locationChannelsModel = LocationChannelsModel(manager: locationManager)
+        self.privateConversationModel = PrivateConversationModel(
+            chatViewModel: self.chatViewModel,
+            conversations: conversations,
+            locationChannelsModel: self.locationChannelsModel,
+            peerIdentityStore: peerIdentityStore
+        )
+        self.verificationModel = VerificationModel(
+            chatViewModel: self.chatViewModel,
+            privateConversationModel: self.privateConversationModel,
+            peerIdentityStore: peerIdentityStore
+        )
+        self.conversationUIModel = ConversationUIModel(
+            chatViewModel: self.chatViewModel,
+            privateConversationModel: self.privateConversationModel,
+            conversations: conversations
+        )
+        self.peerListModel = PeerListModel(
+            chatViewModel: self.chatViewModel,
+            conversations: conversations,
+            locationChannelsModel: self.locationChannelsModel,
+            peerIdentityStore: peerIdentityStore,
+            locationPresenceStore: locationPresenceStore
+        )
+        self.appChromeModel = AppChromeModel(
+            chatViewModel: self.chatViewModel,
+            privateInboxModel: self.privateInboxModel
+        )
+
+        GeoRelayDirectory.shared.prefetchIfNeeded()
+        bindRuntimeObservers()
+        NotificationDelegate.shared.runtime = self
+    }
+
+    func start() {
+        guard !started else {
+            checkForSharedContent()
+            return
+        }
+
+        started = true
+        NotificationDelegate.shared.runtime = self
+        VerificationService.shared.configure(with: chatViewModel.meshService)
+        announceInitialTorStatusIfNeeded()
+
+        Task(priority: .utility) { [weak self] in
+            guard let self else { return }
+            let nickname = await MainActor.run { self.chatViewModel.nickname }
+            let npub = await MainActor.run {
+                try? self.idBridge.getCurrentNostrIdentity()?.npub
+            }
+            await MainActor.run {
+                _ = VerificationService.shared.buildMyQRString(nickname: nickname, npub: npub)
+            }
+        }
+
+        NetworkActivationService.shared.start()
+        GeohashPresenceService.shared.start()
+        checkForSharedContent()
+
+        record(.launched)
+        record(.startupCompleted)
+    }
+
+    func handleOpenURL(_ url: URL) {
+        record(.openedURL(url.absoluteString))
+
+        if url.scheme == "bitchat", url.host == "share" {
+            checkForSharedContent()
+        }
+    }
+
+    func handleDidBecomeActiveNotification() {
+        chatViewModel.handleDidBecomeActive()
+        checkForSharedContent()
+    }
+
+    #if os(macOS)
+    func handleMacDidBecomeActiveNotification() {
+        record(.scenePhaseChanged(.active))
+        chatViewModel.handleDidBecomeActive()
+        checkForSharedContent()
+    }
+    #endif
+
+    #if os(iOS)
+    func handleScenePhaseChange(_ newPhase: ScenePhase) {
+        switch newPhase {
+        case .background:
+            record(.scenePhaseChanged(.background))
+            TorManager.shared.setAppForeground(false)
+            TorManager.shared.goDormantOnBackground()
+            chatViewModel.endGeohashSampling()
+            NostrRelayManager.shared.disconnect()
+            didEnterBackground = true
+
+        case .active:
+            record(.scenePhaseChanged(.active))
+            chatViewModel.meshService.startServices()
+            TorManager.shared.setAppForeground(true)
+            let shouldRefreshNostrConnections = didHandleInitialActive && didEnterBackground
+
+            if didHandleInitialActive && didEnterBackground {
+                if TorManager.shared.isAutoStartAllowed() && !TorManager.shared.isReady {
+                    TorManager.shared.ensureRunningOnForeground()
+                }
+            } else {
+                didHandleInitialActive = true
+            }
+
+            didEnterBackground = false
+
+            if shouldRefreshNostrConnections && TorManager.shared.isAutoStartAllowed() {
+                Task.detached {
+                    let _ = await TorManager.shared.awaitReady(timeout: 60)
+                    await MainActor.run {
+                        TorURLSession.shared.rebuild()
+                        NostrRelayManager.shared.resetAllConnections()
+                    }
+                }
+            }
+
+            chatViewModel.handleDidBecomeActive()
+            checkForSharedContent()
+
+        case .inactive:
+            record(.scenePhaseChanged(.inactive))
+
+        @unknown default:
+            break
+        }
+    }
+    #endif
+
+    func applicationWillTerminate() {
+        record(.terminationRequested)
+        chatViewModel.applicationWillTerminate()
+    }
+
+    func handleNotificationResponse(identifier: String, userInfo: [AnyHashable: Any]) {
+        if identifier.hasPrefix("private-"), let peerID = PeerID(str: userInfo["peerID"] as? String) {
+            record(.notificationOpened(peerID: peerID))
+            chatViewModel.startPrivateChat(with: peerID)
+        }
+
+        if let deepLink = userInfo["deeplink"] as? String, let url = URL(string: deepLink) {
+            record(.deepLinkOpened(deepLink))
+            openExternalURL(url)
+        }
+    }
+
+    func presentationOptions(
+        forNotificationIdentifier identifier: String,
+        userInfo: [AnyHashable: Any]
+    ) async -> UNNotificationPresentationOptions {
+        if identifier.hasPrefix("private-"), let peerID = PeerID(str: userInfo["peerID"] as? String) {
+            if conversations.selectedPrivatePeerID == peerID {
+                return []
+            }
+            return [.banner, .sound]
+        }
+
+        if identifier.hasPrefix("geo-activity-"),
+           let deepLink = userInfo["deeplink"] as? String,
+           let geohash = deepLink.components(separatedBy: "/").last,
+           case .location(let channel) = locationChannelsModel.selectedChannel,
+           channel.geohash == geohash {
+            return []
+        }
+
+        return [.banner, .sound]
+    }
+}
+
+private extension AppRuntime {
+    func bindRuntimeObservers() {
+        NostrRelayManager.shared.$isConnected
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isConnected in
+                self?.handleNostrRelayConnectionChanged(isConnected)
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: .TorWillRestart)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.record(.torLifecycleChanged(.willRestart))
+                self?.chatViewModel.handleTorWillRestart()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: .TorDidBecomeReady)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.record(.torLifecycleChanged(.didBecomeReady))
+                self?.chatViewModel.handleTorDidBecomeReady()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: .TorWillStart)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.record(.torLifecycleChanged(.willStart))
+                self?.chatViewModel.handleTorWillStart()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: .TorUserPreferenceChanged)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] notification in
+                self?.record(.torLifecycleChanged(.preferenceChanged))
+                self?.chatViewModel.handleTorPreferenceChanged(notification)
+            }
+            .store(in: &cancellables)
+
+        #if os(iOS)
+        NotificationCenter.default.publisher(for: UIApplication.userDidTakeScreenshotNotification)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.handleScreenshotCaptured()
+            }
+            .store(in: &cancellables)
+        #endif
+    }
+
+    func checkForSharedContent() {
+        guard let userDefaults = UserDefaults(suiteName: BitchatApp.groupID),
+              let sharedContent = userDefaults.string(forKey: "sharedContent"),
+              let sharedDate = userDefaults.object(forKey: "sharedContentDate") as? Date else {
+            return
+        }
+
+        guard Date().timeIntervalSince(sharedDate) < TransportConfig.uiShareAcceptWindowSeconds else {
+            return
+        }
+
+        let contentKind = SharedContentKind(rawValue: userDefaults.string(forKey: "sharedContentType") ?? "") ?? .text
+
+        userDefaults.removeObject(forKey: "sharedContent")
+        userDefaults.removeObject(forKey: "sharedContentType")
+        userDefaults.removeObject(forKey: "sharedContentDate")
+
+        switch contentKind {
+        case .url:
+            if let data = sharedContent.data(using: .utf8),
+               let urlData = try? JSONSerialization.jsonObject(with: data) as? [String: String],
+               let url = urlData["url"] {
+                chatViewModel.sendMessage(url)
+            } else {
+                chatViewModel.sendMessage(sharedContent)
+            }
+        case .text:
+            chatViewModel.sendMessage(sharedContent)
+        }
+
+        record(.sharedContentAccepted(contentKind))
+    }
+
+    func handleNostrRelayConnectionChanged(_ isConnected: Bool) {
+        record(.nostrRelayConnectionChanged(isConnected))
+
+        let becameConnected = isConnected && !lastNostrRelayConnectedState
+        lastNostrRelayConnectedState = isConnected
+
+        guard started, becameConnected else { return }
+
+        let isInitialConnection = !didHandleInitialNostrConnection
+        didHandleInitialNostrConnection = true
+
+        if !chatViewModel.nostrHandlersSetup {
+            chatViewModel.setupNostrMessageHandling()
+            chatViewModel.nostrHandlersSetup = true
+        }
+
+        guard !isInitialConnection else { return }
+
+        chatViewModel.resubscribeCurrentGeohash()
+        chatViewModel.geoChannelCoordinator?.refreshSampling()
+    }
+
+    func announceInitialTorStatusIfNeeded() {
+        if TorManager.shared.torEnforced &&
+            !chatViewModel.torStatusAnnounced &&
+            TorManager.shared.isAutoStartAllowed() {
+            chatViewModel.torStatusAnnounced = true
+            chatViewModel.addGeohashOnlySystemMessage(
+                String(localized: "system.tor.starting", comment: "System message when Tor is starting")
+            )
+        } else if !TorManager.shared.torEnforced && !chatViewModel.torStatusAnnounced {
+            chatViewModel.torStatusAnnounced = true
+            chatViewModel.addGeohashOnlySystemMessage(
+                String(localized: "system.tor.dev_bypass", comment: "System message when Tor bypass is enabled in development")
+            )
+        }
+    }
+
+    func handleScreenshotCaptured() {
+        if appChromeModel.isLocationChannelsSheetPresented {
+            appChromeModel.triggerScreenshotPrivacyWarning()
+            return
+        }
+
+        if appChromeModel.isAppInfoPresented {
+            return
+        }
+
+        chatViewModel.handleScreenshotCaptured()
+    }
+
+    func openExternalURL(_ url: URL) {
+        #if os(iOS)
+        UIApplication.shared.open(url)
+        #else
+        NSWorkspace.shared.open(url)
+        #endif
+    }
+
+    func record(_ event: AppEvent) {
+        Task {
+            await events.emit(event)
+        }
+    }
+}

bitchat/App/ConversationStore.swift

@@ -0,0 +1,918 @@
+//
+// ConversationStore.swift
+// bitchat
+//
+// Single source of truth for conversation message state (see
+// docs/CONVERSATION-STORE-DESIGN.md). One `Conversation` object per
+// `ConversationID`; all mutations flow through the store's intent API and
+// every mutation emits a `ConversationChange` after state is consistent.
+//
+// The store also owns conversation selection: the active public channel and
+// the selected private peer (the two UI selection axes) plus the derived
+// `selectedConversationID`.
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import BitFoundation
+import BitLogger
+import Combine
+import Foundation
+
+// MARK: - Conversation
+
+/// A single conversation timeline (`.mesh`, `.geohash`, or `.direct`).
+///
+/// Publishing granularity is per conversation: views observe ONE
+/// `Conversation` object, so an append to chat A never invalidates observers
+/// of chat B.
+///
+/// Mutations are `fileprivate` by design — only `ConversationStore`'s intent
+/// API may mutate a conversation, keeping the store the sole writer.
+@MainActor
+final class Conversation: ObservableObject, Identifiable {
+    let id: ConversationID
+    /// Maximum retained messages; oldest are trimmed on overflow.
+    let cap: Int
+
+    @Published private(set) var messages: [BitchatMessage] = []
+    @Published private(set) var isUnread: Bool = false
+
+    /// Incrementally-maintained message-ID → index map for O(1) dedup and
+    /// delivery-status lookup. Kept in sync on every mutation:
+    /// - tail append: single insert
+    /// - out-of-order insert: suffix reindex from the insertion point
+    /// - trim: full rebuild — `removeFirst(k)` is already O(n), so the
+    ///   rebuild does not change the asymptotics, and trim only happens once
+    ///   the cap (1337) is reached. Simple and correct beats the
+    ///   offset-tracking alternative here.
+    private var indexByMessageID: [String: Int] = [:]
+
+    fileprivate init(id: ConversationID, cap: Int) {
+        self.id = id
+        self.cap = max(1, cap)
+    }
+
+    // MARK: Reads
+
+    func containsMessage(withID messageID: String) -> Bool {
+        indexByMessageID[messageID] != nil
+    }
+
+    func message(withID messageID: String) -> BitchatMessage? {
+        guard let index = indexByMessageID[messageID] else { return nil }
+        return messages[index]
+    }
+
+    /// All message IDs currently in this conversation (unordered).
+    var messageIDs: Dictionary<String, Int>.Keys {
+        indexByMessageID.keys
+    }
+
+    // MARK: Store-internal mutations
+
+    /// Result of an ordered insert. `trimmedMessageIDs` reports messages
+    /// evicted by the cap so the store can keep its message-ID →
+    /// conversation map exact.
+    fileprivate struct InsertResult {
+        let inserted: Bool
+        let trimmedMessageIDs: [String]
+
+        static let duplicate = InsertResult(inserted: false, trimmedMessageIDs: [])
+    }
+
+    fileprivate enum UpsertOutcome {
+        case appended(trimmedMessageIDs: [String])
+        case updated
+    }
+
+    /// Inserts a message in timestamp order, deduplicating by message ID.
+    /// Fast path appends when the timestamp is >= the current tail;
+    /// otherwise a binary search finds the upper-bound insertion point so
+    /// arrival order is preserved among equal timestamps.
+    /// Reports `inserted: false` if a message with the same ID already exists.
+    fileprivate func insert(_ message: BitchatMessage) -> InsertResult {
+        guard indexByMessageID[message.id] == nil else { return .duplicate }
+
+        if let last = messages.last, message.timestamp < last.timestamp {
+            let index = insertionIndex(for: message.timestamp)
+            messages.insert(message, at: index)
+            reindex(from: index)
+        } else {
+            messages.append(message)
+            indexByMessageID[message.id] = messages.count - 1
+        }
+
+        return InsertResult(inserted: true, trimmedMessageIDs: trimIfNeeded())
+    }
+
+    /// Replace-or-append by message ID. An existing message keeps its
+    /// timeline position (in-place updates like media progress reuse the
+    /// original timestamp); a new message goes through ordered insertion.
+    fileprivate func upsert(_ message: BitchatMessage) -> UpsertOutcome {
+        if let index = indexByMessageID[message.id] {
+            messages[index] = message
+            return .updated
+        }
+        let result = insert(message)
+        return .appended(trimmedMessageIDs: result.trimmedMessageIDs)
+    }
+
+    /// Applies a delivery status keyed by message ID, honoring the
+    /// no-downgrade rule (the SOLE enforcement point — every delivery
+    /// update flows through the store): equal statuses are skipped, and
+    /// `.read` is never downgraded to `.delivered` or `.sent`.
+    /// Returns `true` when the status was applied.
+    fileprivate func applyDeliveryStatus(_ status: DeliveryStatus, forMessageID messageID: String) -> Bool {
+        guard let index = indexByMessageID[messageID] else { return false }
+        let message = messages[index]
+        guard !Self.shouldSkipStatusUpdate(current: message.deliveryStatus, new: status) else { return false }
+
+        message.deliveryStatus = status
+        // BitchatMessage is a reference type; write back through the
+        // subscript so the @Published wrapper emits.
+        messages[index] = message
+        return true
+    }
+
+    /// Republishes a message without changing state. Used for mirrored
+    /// copies that share a BitchatMessage instance: the first conversation's
+    /// status apply mutated the shared object, so this conversation's
+    /// observers still need an @Published emission to re-render.
+    @discardableResult
+    fileprivate func republishMessage(withID messageID: String) -> Bool {
+        guard let index = indexByMessageID[messageID] else { return false }
+        messages[index] = messages[index]
+        return true
+    }
+
+    @discardableResult
+    fileprivate func setUnread(_ unread: Bool) -> Bool {
+        guard isUnread != unread else { return false }
+        isUnread = unread
+        return true
+    }
+
+    /// Removes a single message by ID. Returns the removed message, or
+    /// `nil` when no message with that ID exists.
+    fileprivate func remove(messageID: String) -> BitchatMessage? {
+        guard let index = indexByMessageID[messageID] else { return nil }
+        let removed = messages.remove(at: index)
+        indexByMessageID.removeValue(forKey: messageID)
+        reindex(from: index)
+        return removed
+    }
+
+    /// Removes every message matching `predicate`. Returns the removed
+    /// message IDs (empty when nothing matched).
+    fileprivate func removeAll(where predicate: (BitchatMessage) -> Bool) -> [String] {
+        var removedIDs: [String] = []
+        messages.removeAll { message in
+            guard predicate(message) else { return false }
+            removedIDs.append(message.id)
+            return true
+        }
+        guard !removedIDs.isEmpty else { return [] }
+        for id in removedIDs {
+            indexByMessageID.removeValue(forKey: id)
+        }
+        reindex(from: 0)
+        return removedIDs
+    }
+
+    fileprivate func clearMessages() {
+        messages.removeAll()
+        indexByMessageID.removeAll()
+    }
+
+    // MARK: Diagnostics
+
+    /// Appends human-readable invariant violations for this conversation
+    /// (empty when healthy): the ID index must be the exact inverse of the
+    /// messages array, the cap must hold, and timestamps must be
+    /// non-decreasing (equal timestamps keep arrival order, so only strict
+    /// inversions are violations). O(messages); allocates only on violation.
+    fileprivate func collectInvariantViolations(into violations: inout [String], label: String) {
+        if indexByMessageID.count != messages.count {
+            violations.append("\(label): index has \(indexByMessageID.count) entries for \(messages.count) messages")
+        }
+        if messages.count > cap {
+            violations.append("\(label): \(messages.count) messages exceeds cap \(cap)")
+        }
+        var previousTimestamp: Date?
+        for position in messages.indices {
+            let message = messages[position]
+            // Count equality + every message resolving to its own position
+            // proves the index is exactly the inverse map (no stale extras).
+            if let index = indexByMessageID[message.id] {
+                if index != position {
+                    violations.append("\(label): message \(message.id.prefix(8))… at \(position) indexed at \(index)")
+                }
+            } else {
+                violations.append("\(label): message \(message.id.prefix(8))… at \(position) missing from index")
+            }
+            if let previousTimestamp, message.timestamp < previousTimestamp {
+                violations.append("\(label): timestamp order violated at \(position)")
+            }
+            previousTimestamp = message.timestamp
+        }
+    }
+
+    // MARK: Internals
+
+    static func shouldSkipStatusUpdate(current: DeliveryStatus?, new: DeliveryStatus) -> Bool {
+        guard let current else { return false }
+        if current == new { return true }
+
+        switch (current, new) {
+        case (.read, .delivered), (.read, .sent):
+            return true
+        default:
+            return false
+        }
+    }
+
+    /// Upper-bound binary search: first index whose timestamp is strictly
+    /// greater than `timestamp`, so equal-timestamp messages keep arrival
+    /// order.
+    private func insertionIndex(for timestamp: Date) -> Int {
+        var low = 0
+        var high = messages.count
+        while low < high {
+            let mid = (low + high) / 2
+            if messages[mid].timestamp <= timestamp {
+                low = mid + 1
+            } else {
+                high = mid
+            }
+        }
+        return low
+    }
+
+    private func reindex(from start: Int) {
+        for index in start..<messages.count {
+            indexByMessageID[messages[index].id] = index
+        }
+    }
+
+    /// Trims oldest messages over the cap; returns the trimmed message IDs.
+    private func trimIfNeeded() -> [String] {
+        guard messages.count > cap else { return [] }
+        let overflow = messages.count - cap
+        let trimmedIDs = messages.prefix(overflow).map(\.id)
+        for id in trimmedIDs {
+            indexByMessageID.removeValue(forKey: id)
+        }
+        messages.removeFirst(overflow)
+        reindex(from: 0)
+        return trimmedIDs
+    }
+}
+
+// MARK: - ConversationChange
+
+/// Typed mutation events for non-UI consumers (delivery tracking,
+/// notifications, sync) that need "something changed in conversation X"
+/// without subscribing to whole message arrays. Emitted on the store's
+/// `changes` subject AFTER the corresponding state is consistent.
+enum ConversationChange {
+    case appended(ConversationID, BitchatMessage)
+    case updated(ConversationID, messageID: String)
+    case statusChanged(ConversationID, messageID: String, DeliveryStatus)
+    case messageRemoved(ConversationID, messageID: String)
+    case cleared(ConversationID)
+    case removed(ConversationID)
+    case migrated(from: ConversationID, to: ConversationID)
+    case unreadChanged(ConversationID, isUnread: Bool)
+}
+
+// MARK: - ConversationStore
+
+/// Sole writer and sole holder of conversation message state. All mutations
+/// go through the intent API below; backing collections are `private(set)`.
+/// Reads are synchronous — writers and readers share the main actor, so
+/// after an intent returns every observer sees the result.
+@MainActor
+final class ConversationStore: ObservableObject {
+    /// Conversation creation order; published so list-style consumers can
+    /// observe conversations appearing/disappearing without rebuilding from
+    /// the dictionary.
+    @Published private(set) var conversationIDs: [ConversationID] = []
+    @Published private(set) var selectedConversationID: ConversationID?
+    @Published private(set) var unreadConversations: Set<ConversationID> = []
+
+    // MARK: Selection state
+    // The two UI selection axes: which public channel is active, and which
+    // private chat (if any) is open on top of it. `selectedConversationID`
+    // is derived: the open private chat wins, otherwise the active public
+    // channel's conversation. Mutate via `setActiveChannel` /
+    // `setSelectedPrivatePeer` only.
+
+    @Published private(set) var activeChannel: ChannelID = .mesh
+    @Published private(set) var selectedPrivatePeerID: PeerID?
+
+    private(set) var conversationsByID: [ConversationID: Conversation] = [:]
+
+    /// Store-level message-ID → conversation-membership map for ID-only
+    /// lookups (delivery receipts arrive with a message ID, not a
+    /// conversation). Maintained incrementally at every mutation point —
+    /// all mutation is centralized in the intent API below, so the map is
+    /// exact, never scanned or rebuilt.
+    ///
+    /// The value is a `Set` because a private message can legitimately live
+    /// in TWO direct conversations: step 2's raw per-peer keying mirrors a
+    /// message into both the stable-key and ephemeral-peer chats
+    /// (`mirrorToEphemeralIfNeeded`). A delivery update must reach both
+    /// copies.
+    private var conversationIDsByMessageID: [String: Set<ConversationID>] = [:]
+
+    /// Monotonic count of messages inserted into any conversation (appends,
+    /// upsert-appends, migration inserts). Field-observability only: the
+    /// periodic store audit folds the delta into its heartbeat line so logs
+    /// carry throughput context. Never read on a hot path.
+    private(set) var appendCount: Int = 0
+
+    /// Sample counter for the mirrored-republish debug log in the ID-only
+    /// `setDeliveryStatus` fan-out (first + every Nth occurrence).
+    private var mirroredRepublishLogCount = 0
+
+    let changes = PassthroughSubject<ConversationChange, Never>()
+
+    // MARK: Intent API
+
+    /// Returns the conversation for `id`, creating it (with the cap policy
+    /// for its kind) on first access.
+    @discardableResult
+    func conversation(for id: ConversationID) -> Conversation {
+        if let existing = conversationsByID[id] {
+            return existing
+        }
+        let conversation = Conversation(id: id, cap: Self.cap(for: id))
+        conversationsByID[id] = conversation
+        conversationIDs.append(id)
+        return conversation
+    }
+
+    /// Appends a message in timestamp order. Returns `false` (and emits
+    /// nothing) if a message with the same ID is already present.
+    @discardableResult
+    func append(_ message: BitchatMessage, to id: ConversationID) -> Bool {
+        let conversation = conversation(for: id)
+        let result = conversation.insert(message)
+        guard result.inserted else { return false }
+        registerMessageID(message.id, in: id)
+        unregisterMessageIDs(result.trimmedMessageIDs, from: id)
+        changes.send(.appended(id, message))
+        return true
+    }
+
+    /// Replace-or-append by message ID (media progress, edits).
+    func upsertByID(_ message: BitchatMessage, in id: ConversationID) {
+        let conversation = conversation(for: id)
+        switch conversation.upsert(message) {
+        case .appended(let trimmedMessageIDs):
+            registerMessageID(message.id, in: id)
+            unregisterMessageIDs(trimmedMessageIDs, from: id)
+            changes.send(.appended(id, message))
+        case .updated:
+            changes.send(.updated(id, messageID: message.id))
+        }
+    }
+
+    /// Applies a delivery status keyed by message ID. Returns `false` when
+    /// the message is unknown or the update would downgrade the status
+    /// (read beats delivered beats sent).
+    @discardableResult
+    func setDeliveryStatus(_ status: DeliveryStatus, forMessageID messageID: String, in id: ConversationID) -> Bool {
+        guard let conversation = conversationsByID[id],
+              conversation.applyDeliveryStatus(status, forMessageID: messageID) else {
+            return false
+        }
+        changes.send(.statusChanged(id, messageID: messageID, status))
+        return true
+    }
+
+    /// Applies a delivery status to EVERY conversation containing
+    /// `messageID` (ID-only — delivery receipts don't know conversations;
+    /// mirrored private copies live in two direct chats). Returns `false`
+    /// when the message is unknown or no copy changed (equal status or
+    /// downgrade — read beats delivered beats sent).
+    ///
+    /// `BitchatMessage` is a reference type, so mirrored copies sharing one
+    /// instance are mutated by the first conversation's apply. The skipped
+    /// conversations still hold the changed message, so they get an explicit
+    /// republish and `.statusChanged` event - otherwise a view observing the
+    /// mirrored conversation would render stale status. Distinct copies whose
+    /// update was genuinely rejected (downgrade) are left untouched, guarded
+    /// by status equality.
+    @discardableResult
+    func setDeliveryStatus(_ status: DeliveryStatus, forMessageID messageID: String) -> Bool {
+        guard let ids = conversationIDsByMessageID[messageID] else { return false }
+        var applied = false
+        var skipped: [ConversationID] = []
+        for id in ids {
+            if setDeliveryStatus(status, forMessageID: messageID, in: id) {
+                applied = true
+            } else {
+                skipped.append(id)
+            }
+        }
+        guard applied else { return false }
+        for id in skipped {
+            guard let conversation = conversationsByID[id],
+                  conversation.message(withID: messageID)?.deliveryStatus == status,
+                  conversation.republishMessage(withID: messageID) else { continue }
+            // Field proof the mirrored-copy republish path actually fires;
+            // sampled (first + every Nth) so mirrored chats can't spam logs.
+            mirroredRepublishLogCount += 1
+            if mirroredRepublishLogCount == 1
+                || mirroredRepublishLogCount.isMultiple(of: TransportConfig.conversationStoreMirroredRepublishLogInterval) {
+                SecureLogger.debug(
+                    "mirrored republish #\(mirroredRepublishLogCount) for \(messageID.prefix(8))… in \(id.auditDescription)",
+                    category: .session
+                )
+            }
+            changes.send(.statusChanged(id, messageID: messageID, status))
+        }
+        return true
+    }
+
+    /// Current delivery status of `messageID` in whichever conversation
+    /// holds it (mirrored copies share status — see `setDeliveryStatus`).
+    func deliveryStatus(forMessageID messageID: String) -> DeliveryStatus? {
+        guard let ids = conversationIDsByMessageID[messageID] else { return nil }
+        for id in ids {
+            if let status = conversationsByID[id]?.message(withID: messageID)?.deliveryStatus {
+                return status
+            }
+        }
+        return nil
+    }
+
+    /// Every conversation currently containing `messageID` (empty when the
+    /// message is unknown).
+    func conversationIDs(forMessageID messageID: String) -> Set<ConversationID> {
+        conversationIDsByMessageID[messageID] ?? []
+    }
+
+    func markRead(_ id: ConversationID) {
+        guard unreadConversations.contains(id) else { return }
+        unreadConversations.remove(id)
+        conversationsByID[id]?.setUnread(false)
+        changes.send(.unreadChanged(id, isUnread: false))
+    }
+
+    func markUnread(_ id: ConversationID) {
+        guard !unreadConversations.contains(id) else { return }
+        let conversation = conversation(for: id)
+        unreadConversations.insert(id)
+        conversation.setUnread(true)
+        changes.send(.unreadChanged(id, isUnread: true))
+    }
+
+    /// Selects a conversation (creating it if needed) or clears the
+    /// selection with `nil`.
+    func select(_ id: ConversationID?) {
+        if let id {
+            conversation(for: id)
+        }
+        guard selectedConversationID != id else { return }
+        selectedConversationID = id
+    }
+
+    /// Switches the active public channel. While no private chat is open
+    /// the selection follows the channel.
+    func setActiveChannel(_ channelID: ChannelID) {
+        if activeChannel != channelID {
+            activeChannel = channelID
+        }
+        refreshDerivedSelection()
+    }
+
+    /// Opens a private chat (`nil` closes it, returning the selection to the
+    /// active public channel's conversation).
+    func setSelectedPrivatePeer(_ peerID: PeerID?) {
+        if selectedPrivatePeerID != peerID {
+            selectedPrivatePeerID = peerID
+        }
+        refreshDerivedSelection()
+    }
+
+    private func refreshDerivedSelection() {
+        if let peerID = selectedPrivatePeerID {
+            select(.directPeer(peerID))
+        } else {
+            select(ConversationID(channelID: activeChannel))
+        }
+    }
+
+    /// Moves all messages from `source` into `destination` (the
+    /// ephemeral↔stable peer-ID handoff): dedups by message ID, preserves
+    /// timestamp order, carries unread state over, and hands off the
+    /// selection — mirroring `ChatPrivateConversationCoordinator`'s
+    /// migration semantics. The source conversation is removed. Emits a
+    /// single `.migrated(from:to:)` once the whole move is consistent.
+    func migrateConversation(from source: ConversationID, to destination: ConversationID) {
+        guard source != destination, let sourceConversation = conversationsByID[source] else { return }
+
+        let destinationConversation = conversation(for: destination)
+        for message in sourceConversation.messages {
+            let result = destinationConversation.insert(message)
+            guard result.inserted else { continue }
+            registerMessageID(message.id, in: destination)
+            unregisterMessageIDs(result.trimmedMessageIDs, from: destination)
+        }
+        for messageID in sourceConversation.messageIDs {
+            unregisterMessageID(messageID, from: source)
+        }
+
+        let wasUnread = unreadConversations.contains(source)
+        let wasSelected = selectedConversationID == source
+
+        conversationsByID.removeValue(forKey: source)
+        conversationIDs.removeAll { $0 == source }
+        unreadConversations.remove(source)
+
+        if wasUnread, !unreadConversations.contains(destination) {
+            unreadConversations.insert(destination)
+            destinationConversation.setUnread(true)
+        }
+        if wasSelected {
+            selectedConversationID = destination
+            // Keep the private-peer selection axis consistent with the
+            // handed-off selection.
+            if let peerID = selectedPrivatePeerID,
+               source == .directPeer(peerID),
+               case .direct(let destinationHandle) = destination {
+                selectedPrivatePeerID = destinationHandle.routingPeerID
+            }
+        }
+
+        changes.send(.migrated(from: source, to: destination))
+    }
+
+    /// Removes a single message by ID from a conversation. Returns the
+    /// removed message, or `nil` (emitting nothing) when the conversation or
+    /// message is unknown.
+    @discardableResult
+    func removeMessage(withID messageID: String, from id: ConversationID) -> BitchatMessage? {
+        guard let conversation = conversationsByID[id],
+              let removed = conversation.remove(messageID: messageID) else {
+            return nil
+        }
+        unregisterMessageID(messageID, from: id)
+        changes.send(.messageRemoved(id, messageID: messageID))
+        return removed
+    }
+
+    /// Removes every message matching `predicate` from a conversation,
+    /// emitting one `.messageRemoved` per removed message after the
+    /// conversation is consistent. No-op for unknown conversations.
+    func removeMessages(from id: ConversationID, where predicate: (BitchatMessage) -> Bool) {
+        guard let conversation = conversationsByID[id] else { return }
+        let removedIDs = conversation.removeAll(where: predicate)
+        unregisterMessageIDs(removedIDs, from: id)
+        for messageID in removedIDs {
+            changes.send(.messageRemoved(id, messageID: messageID))
+        }
+    }
+
+    /// Empties a conversation's timeline but keeps the conversation (and
+    /// its unread/selection state) alive.
+    func clear(_ id: ConversationID) {
+        guard let conversation = conversationsByID[id] else { return }
+        for messageID in conversation.messageIDs {
+            unregisterMessageID(messageID, from: id)
+        }
+        conversation.clearMessages()
+        changes.send(.cleared(id))
+    }
+
+    /// Removes a conversation entirely, including unread state; clears the
+    /// selection if it pointed at the removed conversation.
+    func removeConversation(_ id: ConversationID) {
+        guard let conversation = conversationsByID.removeValue(forKey: id) else { return }
+        for messageID in conversation.messageIDs {
+            unregisterMessageID(messageID, from: id)
+        }
+        conversationIDs.removeAll { $0 == id }
+        unreadConversations.remove(id)
+        if selectedConversationID == id {
+            selectedConversationID = nil
+        }
+        changes.send(.removed(id))
+    }
+
+    func clearAll() {
+        let removedIDs = conversationIDs
+        guard !removedIDs.isEmpty || selectedConversationID != nil else { return }
+
+        conversationsByID.removeAll()
+        conversationIDs.removeAll()
+        unreadConversations.removeAll()
+        conversationIDsByMessageID.removeAll()
+        if selectedConversationID != nil {
+            selectedConversationID = nil
+        }
+
+        for id in removedIDs {
+            changes.send(.removed(id))
+        }
+    }
+
+    // MARK: Diagnostics
+
+    /// Total messages across all conversations. O(#conversations) — heartbeat
+    /// logging only, never a hot path.
+    var totalMessageCount: Int {
+        conversationsByID.values.reduce(0) { $0 + $1.messages.count }
+    }
+
+    /// Number of distinct message IDs in the store-level membership map.
+    var messageIDMapCount: Int {
+        conversationIDsByMessageID.count
+    }
+
+    /// Verifies the store's correctness invariants and returns human-readable
+    /// violations (empty = healthy). Intended for a periodic field audit:
+    /// O(total messages) and allocation-free while healthy. Checks:
+    /// - the `conversationIDs` ordering array matches `conversationsByID`
+    /// - per conversation: ID index exact, cap held, timestamp order
+    ///   (see `Conversation.collectInvariantViolations`)
+    /// - the message-ID → conversation map matches reality exactly: every
+    ///   mapped membership points at a live conversation actually holding
+    ///   the message, and total memberships equal total messages (with the
+    ///   forward check, equality proves no conversation message is missing
+    ///   from the map)
+    /// - `unreadConversations` only references existing conversations
+    /// - `selectedConversationID`, when set, references an existing
+    ///   conversation (`select(_:)` creates on selection and
+    ///   `removeConversation`/`clearAll` clear it, so existence is the
+    ///   invariant for both the channel-derived and direct-peer cases)
+    func auditInvariants() -> [String] {
+        var violations: [String] = []
+
+        if conversationIDs.count != conversationsByID.count {
+            violations.append("conversationIDs lists \(conversationIDs.count) conversations but dictionary holds \(conversationsByID.count)")
+        }
+        for id in conversationIDs where conversationsByID[id] == nil {
+            violations.append("conversationIDs lists \(id.auditDescription) but no conversation exists")
+        }
+
+        var totalMessages = 0
+        for (id, conversation) in conversationsByID {
+            totalMessages += conversation.messages.count
+            conversation.collectInvariantViolations(into: &violations, label: id.auditDescription)
+        }
+
+        var totalMappedMemberships = 0
+        for (messageID, ids) in conversationIDsByMessageID {
+            totalMappedMemberships += ids.count
+            if ids.isEmpty {
+                violations.append("message map: \(messageID.prefix(8))… has an empty membership set")
+            }
+            for id in ids {
+                guard let conversation = conversationsByID[id] else {
+                    violations.append("message map: \(messageID.prefix(8))… claims unknown conversation \(id.auditDescription)")
+                    continue
+                }
+                if !conversation.containsMessage(withID: messageID) {
+                    violations.append("message map: \(messageID.prefix(8))… not present in claimed conversation \(id.auditDescription)")
+                }
+            }
+        }
+        if totalMappedMemberships != totalMessages {
+            violations.append("message map holds \(totalMappedMemberships) memberships but conversations hold \(totalMessages) messages")
+        }
+
+        for id in unreadConversations where conversationsByID[id] == nil {
+            violations.append("unreadConversations contains unknown conversation \(id.auditDescription)")
+        }
+
+        if let selected = selectedConversationID, conversationsByID[selected] == nil {
+            violations.append("selectedConversationID \(selected.auditDescription) has no conversation")
+        }
+
+        return violations
+    }
+
+    // MARK: Internals
+
+    private func registerMessageID(_ messageID: String, in id: ConversationID) {
+        conversationIDsByMessageID[messageID, default: []].insert(id)
+        // Single choke point for every successful insertion (append, upsert
+        // append, migration insert) — the audit heartbeat's throughput delta.
+        appendCount += 1
+    }
+
+    private func unregisterMessageID(_ messageID: String, from id: ConversationID) {
+        guard var ids = conversationIDsByMessageID[messageID] else { return }
+        ids.remove(id)
+        if ids.isEmpty {
+            conversationIDsByMessageID.removeValue(forKey: messageID)
+        } else {
+            conversationIDsByMessageID[messageID] = ids
+        }
+    }
+
+    private func unregisterMessageIDs(_ messageIDs: [String], from id: ConversationID) {
+        for messageID in messageIDs {
+            unregisterMessageID(messageID, from: id)
+        }
+    }
+
+    private static func cap(for id: ConversationID) -> Int {
+        switch id {
+        case .mesh:
+            return TransportConfig.meshTimelineCap
+        case .geohash:
+            return TransportConfig.geoTimelineCap
+        case .direct:
+            return TransportConfig.privateChatCap
+        }
+    }
+}
+
+// MARK: - Direct-conversation keying + derived views
+
+extension ConversationID {
+    /// Direct-conversation ID keyed by the *raw* routing peer ID.
+    ///
+    /// Direct conversations are deliberately keyed per `PeerID`, not per
+    /// resolved identity: the private-chat coordinators mirror messages into
+    /// both the ephemeral and stable peer's conversations
+    /// (`mirrorToEphemeralIfNeeded`) and consolidate/migrate between them
+    /// explicitly, so a raw lookup by whichever peer ID is selected always
+    /// finds the right timeline without an identity-resolution layer.
+    static func directPeer(_ peerID: PeerID) -> ConversationID {
+        .direct(PeerHandle(id: "peer:\(peerID.id)", routingPeerID: peerID))
+    }
+}
+
+extension ConversationStore {
+    /// All direct conversations' messages keyed by routing peer ID — the
+    /// shape `ChatViewModel.privateChats` exposes to the coordinators.
+    /// Values are the conversations' backing arrays (COW), so building this
+    /// is O(#conversations), not O(#messages).
+    func directMessagesByRoutingPeerID() -> [PeerID: [BitchatMessage]] {
+        var messagesByPeerID: [PeerID: [BitchatMessage]] = [:]
+        messagesByPeerID.reserveCapacity(conversationsByID.count)
+        for (id, conversation) in conversationsByID {
+            guard case .direct(let handle) = id else { continue }
+            messagesByPeerID[handle.routingPeerID] = conversation.messages
+        }
+        return messagesByPeerID
+    }
+
+    /// Unread direct conversations as routing peer IDs — the shape
+    /// `ChatViewModel.unreadPrivateMessages` exposes to the coordinators.
+    func unreadDirectRoutingPeerIDs() -> Set<PeerID> {
+        var peerIDs = Set<PeerID>()
+        for id in unreadConversations {
+            guard case .direct(let handle) = id else { continue }
+            peerIDs.insert(handle.routingPeerID)
+        }
+        return peerIDs
+    }
+
+    /// `true` when any direct conversation contains a message with `messageID`
+    /// (O(1) via the store-level message-ID → conversation map).
+    func directConversationsContainMessage(withID messageID: String) -> Bool {
+        conversationIDs(forMessageID: messageID).contains { id in
+            if case .direct = id { return true }
+            return false
+        }
+    }
+
+    /// Message IDs across all direct conversations (read-receipt pruning
+    /// keeps only receipts whose messages still exist).
+    func directMessageIDs() -> Set<String> {
+        var messageIDs = Set<String>()
+        for (id, conversation) in conversationsByID {
+            guard case .direct = id else { continue }
+            messageIDs.formUnion(conversation.messageIDs)
+        }
+        return messageIDs
+    }
+
+    /// Removes every direct conversation (panic clear).
+    func removeAllDirectConversations() {
+        let directIDs = conversationIDs.filter { id in
+            if case .direct = id { return true }
+            return false
+        }
+        for id in directIDs {
+            removeConversation(id)
+        }
+    }
+}
+
+// MARK: - Diagnostics support
+
+extension ConversationID {
+    /// Short, log-safe description for audit/diagnostic lines. Direct
+    /// conversations truncate the handle so full peer keys never hit logs.
+    fileprivate var auditDescription: String {
+        switch self {
+        case .mesh:
+            return "mesh"
+        case .geohash(let geohash):
+            return "geo:\(geohash)"
+        case .direct(let handle):
+            return "direct:\(handle.id.prefix(13))…"
+        }
+    }
+}
+
+#if DEBUG
+// Test-only corruption hooks for `auditInvariants()` tests. The store is the
+// sole writer by design — `Conversation`'s mutators are fileprivate and the
+// store's backing collections are private — so the inconsistent states the
+// audit exists to catch CANNOT be manufactured through the intent API. These
+// DEBUG-only hooks deliberately bypass that lockdown to inject exactly those
+// impossible states. Never call them outside tests.
+extension Conversation {
+    /// Points an existing message's index entry at the wrong position
+    /// (positions 0 and 1 swap their index entries). Requires >= 2 messages.
+    func _testCorruptIndexEntries() {
+        guard messages.count >= 2 else { return }
+        indexByMessageID[messages[0].id] = 1
+        indexByMessageID[messages[1].id] = 0
+    }
+
+    /// Drops a message's index entry entirely (count mismatch + missing).
+    func _testRemoveIndexEntry(forMessageID messageID: String) {
+        indexByMessageID.removeValue(forKey: messageID)
+    }
+
+    /// Swaps the first and last messages while keeping the index consistent,
+    /// so ONLY the timestamp-order invariant is violated (requires the two
+    /// messages to have distinct timestamps).
+    func _testCorruptOrderingPreservingIndex() {
+        guard messages.count >= 2 else { return }
+        messages.swapAt(0, messages.count - 1)
+        indexByMessageID[messages[0].id] = 0
+        indexByMessageID[messages[messages.count - 1].id] = messages.count - 1
+    }
+}
+
+extension ConversationStore {
+    /// Adds a map membership that the conversation does not actually hold.
+    func _testRegisterPhantomMessageID(_ messageID: String, in id: ConversationID) {
+        conversationIDsByMessageID[messageID, default: []].insert(id)
+    }
+
+    /// Drops a real map membership (conversation message missing from map).
+    func _testUnregisterMessageID(_ messageID: String, from id: ConversationID) {
+        conversationIDsByMessageID[messageID]?.remove(id)
+        if conversationIDsByMessageID[messageID]?.isEmpty == true {
+            conversationIDsByMessageID.removeValue(forKey: messageID)
+        }
+    }
+
+    /// Appends past the conversation cap, bypassing trim (map kept exact so
+    /// only the cap invariant is violated).
+    func _testAppendBypassingCap(_ message: BitchatMessage, to id: ConversationID) {
+        let conversation = conversation(for: id)
+        conversation._testAppendBypassingTrim(message)
+        conversationIDsByMessageID[message.id, default: []].insert(id)
+    }
+
+    /// Marks a nonexistent conversation unread without creating it.
+    func _testInsertUnreadConversationID(_ id: ConversationID) {
+        unreadConversations.insert(id)
+    }
+
+    /// Sets the selection directly, without `select(_:)`'s create-on-select.
+    func _testSetSelectedConversationID(_ id: ConversationID?) {
+        selectedConversationID = id
+    }
+}
+
+extension Conversation {
+    fileprivate func _testAppendBypassingTrim(_ message: BitchatMessage) {
+        messages.append(message)
+        indexByMessageID[message.id] = messages.count - 1
+    }
+}
+#endif
+
+// MARK: - Public timeline derived views
+
+extension ConversationStore {
+    /// Removes a message by ID from whichever public (mesh/geohash)
+    /// conversation contains it. Returns the removed message, if any.
+    @discardableResult
+    func removePublicMessage(withID messageID: String) -> BitchatMessage? {
+        for id in conversationIDs(forMessageID: messageID) {
+            switch id {
+            case .mesh, .geohash:
+                return removeMessage(withID: messageID, from: id)
+            case .direct:
+                continue
+            }
+        }
+        return nil
+    }
+}

bitchat/App/ConversationUIModel.swift

@@ -0,0 +1,187 @@
+import BitFoundation
+import Combine
+import SwiftUI
+#if os(iOS)
+import UIKit
+#endif
+
+@MainActor
+final class ConversationUIModel: ObservableObject {
+    @Published private(set) var showAutocomplete = false
+    @Published private(set) var autocompleteSuggestions: [String] = []
+    @Published private(set) var currentNickname: String
+    @Published private(set) var isBatchingPublic = false
+    @Published private(set) var canSendMediaInCurrentContext = true
+
+    private let chatViewModel: ChatViewModel
+    private let privateConversationModel: PrivateConversationModel
+    private let conversations: ConversationStore
+    private var activeChannel: ChannelID
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        chatViewModel: ChatViewModel,
+        privateConversationModel: PrivateConversationModel,
+        conversations: ConversationStore
+    ) {
+        self.chatViewModel = chatViewModel
+        self.privateConversationModel = privateConversationModel
+        self.conversations = conversations
+        self.activeChannel = conversations.activeChannel
+        self.currentNickname = chatViewModel.nickname
+        self.isBatchingPublic = chatViewModel.isBatchingPublic
+        self.showAutocomplete = chatViewModel.showAutocomplete
+        self.autocompleteSuggestions = chatViewModel.autocompleteSuggestions
+        self.canSendMediaInCurrentContext = chatViewModel.canSendMediaInCurrentContext
+
+        bind()
+    }
+
+    func setCurrentColorScheme(_ colorScheme: ColorScheme) {
+        chatViewModel.currentColorScheme = colorScheme
+    }
+
+    func setCurrentTheme(_ theme: AppTheme) {
+        chatViewModel.currentTheme = theme
+    }
+
+    func sendMessage(_ message: String) {
+        chatViewModel.sendMessage(message)
+    }
+
+    func clearCurrentConversation() {
+        chatViewModel.sendMessage("/clear")
+    }
+
+    func sendHug(to sender: String) {
+        chatViewModel.sendMessage("/hug @\(sender)")
+    }
+
+    func sendSlap(to sender: String) {
+        chatViewModel.sendMessage("/slap @\(sender)")
+    }
+
+    func block(peerID: PeerID?, displayName: String?) {
+        guard let displayName else { return }
+
+        if let peerID, peerID.isGeoChat,
+           let full = chatViewModel.fullNostrHex(forSenderPeerID: peerID) {
+            chatViewModel.blockGeohashUser(pubkeyHexLowercased: full, displayName: displayName)
+        } else {
+            chatViewModel.sendMessage("/block \(displayName)")
+        }
+    }
+
+    func updateAutocomplete(for text: String, cursorPosition: Int) {
+        chatViewModel.updateAutocomplete(for: text, cursorPosition: cursorPosition)
+    }
+
+    func completeNickname(_ nickname: String, in text: inout String) -> Int {
+        chatViewModel.completeNickname(nickname, in: &text)
+    }
+
+    func formatMessage(_ message: BitchatMessage, colorScheme: ColorScheme, theme: AppTheme? = nil) -> AttributedString {
+        chatViewModel.formatMessageAsText(message, colorScheme: colorScheme, theme: theme)
+    }
+
+    func formatMessageHeader(_ message: BitchatMessage, colorScheme: ColorScheme, theme: AppTheme? = nil) -> AttributedString {
+        chatViewModel.formatMessageHeader(message, colorScheme: colorScheme, theme: theme)
+    }
+
+    func mediaAttachment(for message: BitchatMessage) -> BitchatMessage.Media? {
+        message.mediaAttachment(for: currentNickname)
+    }
+
+    func isSelfSender(peerID: PeerID?, displayName: String?) -> Bool {
+        chatViewModel.isSelfSender(peerID: peerID, displayName: displayName)
+    }
+
+    func isSentByCurrentUser(_ message: BitchatMessage) -> Bool {
+        message.sender == currentNickname || message.sender.hasPrefix(currentNickname + "#")
+    }
+
+    func isMediaMessageFromCurrentUser(_ message: BitchatMessage) -> Bool {
+        message.sender == currentNickname || message.senderPeerID == chatViewModel.meshService.myPeerID
+    }
+
+    func senderDisplayName(for peerID: PeerID, fallbackMessages: [BitchatMessage]) -> String? {
+        if peerID.isGeoDM || peerID.isGeoChat {
+            return chatViewModel.geohashDisplayName(for: peerID)
+        }
+        if let nickname = chatViewModel.meshService.peerNickname(peerID: peerID) {
+            return nickname
+        }
+        return fallbackMessages.last(where: { $0.senderPeerID == peerID && $0.sender != "system" })?.sender
+    }
+
+    #if os(iOS)
+    func processSelectedImage(_ image: UIImage?) {
+        chatViewModel.processThenSendImage(image)
+    }
+    #endif
+
+    func processSelectedImage(from url: URL?) {
+        #if os(macOS)
+        chatViewModel.processThenSendImage(from: url)
+        #endif
+    }
+
+    func sendVoiceNote(at url: URL) {
+        chatViewModel.sendVoiceNote(at: url)
+    }
+
+    func cancelMediaSend(messageID: String) {
+        chatViewModel.cancelMediaSend(messageID: messageID)
+    }
+
+    func deleteMediaMessage(messageID: String) {
+        chatViewModel.deleteMediaMessage(messageID: messageID)
+    }
+
+    private func bind() {
+        chatViewModel.$nickname
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$currentNickname)
+
+        chatViewModel.$showAutocomplete
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$showAutocomplete)
+
+        chatViewModel.$autocompleteSuggestions
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$autocompleteSuggestions)
+
+        chatViewModel.$isBatchingPublic
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$isBatchingPublic)
+
+        conversations.$activeChannel
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] channel in
+                self?.activeChannel = channel
+                self?.refreshComputedState()
+            }
+            .store(in: &cancellables)
+
+        privateConversationModel.$selectedPeerID
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshComputedState()
+            }
+            .store(in: &cancellables)
+    }
+
+    private func refreshComputedState() {
+        if let selectedPeerID = privateConversationModel.selectedPeerID {
+            canSendMediaInCurrentContext = !(selectedPeerID.isGeoDM || selectedPeerID.isGeoChat)
+            return
+        }
+
+        switch activeChannel {
+        case .mesh:
+            canSendMediaInCurrentContext = true
+        case .location:
+            canSendMediaInCurrentContext = false
+        }
+    }
+}

bitchat/App/LocationChannelsModel.swift

@@ -0,0 +1,176 @@
+import BitFoundation
+import Combine
+import Foundation
+
+@MainActor
+final class LocationChannelsModel: ObservableObject {
+    @Published private(set) var permissionState: LocationChannelManager.PermissionState
+    @Published private(set) var availableChannels: [GeohashChannel]
+    @Published private(set) var selectedChannel: ChannelID
+    @Published private(set) var teleported: Bool
+    @Published private(set) var bookmarks: [String]
+    @Published private(set) var bookmarkNames: [String: String]
+    @Published private(set) var locationNames: [GeohashChannelLevel: String]
+    @Published private(set) var userTorEnabled: Bool
+
+    private let manager: LocationChannelManager
+    private let network: NetworkActivationService
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        manager: LocationChannelManager? = nil,
+        network: NetworkActivationService? = nil
+    ) {
+        let manager = manager ?? .shared
+        let network = network ?? .shared
+
+        self.manager = manager
+        self.network = network
+        self.permissionState = manager.permissionState
+        self.availableChannels = manager.availableChannels
+        self.selectedChannel = manager.selectedChannel
+        self.teleported = manager.teleported
+        self.bookmarks = manager.bookmarks
+        self.bookmarkNames = manager.bookmarkNames
+        self.locationNames = manager.locationNames
+        self.userTorEnabled = network.userTorEnabled
+
+        bind()
+    }
+
+    var currentBuildingGeohash: String? {
+        availableChannels.first(where: { $0.level == .building })?.geohash
+    }
+
+    func isSelected(_ channel: GeohashChannel) -> Bool {
+        guard case .location(let selected) = selectedChannel else { return false }
+        return selected == channel
+    }
+
+    func isBookmarked(_ geohash: String) -> Bool {
+        manager.isBookmarked(geohash)
+    }
+
+    func enableLocationChannels() {
+        manager.enableLocationChannels()
+    }
+
+    func refreshChannels() {
+        manager.refreshChannels()
+    }
+
+    func enableAndRefresh() {
+        manager.enableLocationChannels()
+        manager.refreshChannels()
+    }
+
+    func beginLiveRefresh() {
+        manager.beginLiveRefresh()
+    }
+
+    func endLiveRefresh() {
+        manager.endLiveRefresh()
+    }
+
+    func select(_ channel: ChannelID) {
+        manager.select(channel)
+    }
+
+    func markTeleported(for geohash: String, _ flag: Bool) {
+        manager.markTeleported(for: geohash, flag)
+    }
+
+    func toggleBookmark(_ geohash: String) {
+        manager.toggleBookmark(geohash)
+    }
+
+    func resolveBookmarkNameIfNeeded(for geohash: String) {
+        manager.resolveBookmarkNameIfNeeded(for: geohash)
+    }
+
+    func locationName(for level: GeohashChannelLevel) -> String? {
+        locationNames[level]
+    }
+
+    func setUserTorEnabled(_ enabled: Bool) {
+        network.setUserTorEnabled(enabled)
+    }
+
+    func refreshMeshChannelsIfNeeded() {
+        guard case .mesh = selectedChannel,
+              permissionState == .authorized,
+              availableChannels.isEmpty else {
+            return
+        }
+        refreshChannels()
+    }
+
+    func openLocationChannel(for geohash: String) {
+        let normalized = geohash.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+        let allowed = Set("0123456789bcdefghjkmnpqrstuvwxyz")
+        guard (2...12).contains(normalized.count),
+              normalized.allSatisfy({ allowed.contains($0) }) else {
+            return
+        }
+
+        let channel = GeohashChannel(level: level(forLength: normalized.count), geohash: normalized)
+        let isRegional = availableChannels.contains { $0.geohash == normalized }
+        if !isRegional && !availableChannels.isEmpty {
+            markTeleported(for: normalized, true)
+        }
+        select(.location(channel))
+    }
+
+    func teleport(to geohash: String) {
+        let normalized = geohash.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+        let channel = GeohashChannel(level: level(forLength: normalized.count), geohash: normalized)
+        markTeleported(for: normalized, true)
+        select(.location(channel))
+    }
+
+    private func bind() {
+        manager.$permissionState
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$permissionState)
+
+        manager.$availableChannels
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$availableChannels)
+
+        manager.$selectedChannel
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$selectedChannel)
+
+        manager.$teleported
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$teleported)
+
+        manager.$bookmarks
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$bookmarks)
+
+        manager.$bookmarkNames
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$bookmarkNames)
+
+        manager.$locationNames
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$locationNames)
+
+        network.$userTorEnabled
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$userTorEnabled)
+    }
+
+    private func level(forLength length: Int) -> GeohashChannelLevel {
+        switch length {
+        case 0...2: return .region
+        case 3...4: return .province
+        case 5: return .city
+        case 6: return .neighborhood
+        case 7: return .block
+        case 8...12: return .building
+        default: return .block
+        }
+    }
+}

bitchat/App/LocationPresenceStore.swift

@@ -0,0 +1,51 @@
+import Combine
+import Foundation
+
+@MainActor
+final class LocationPresenceStore: ObservableObject {
+    @Published private(set) var currentGeohash: String?
+    @Published private(set) var geoNicknames: [String: String] = [:]
+    @Published private(set) var teleportedGeo: Set<String> = []
+
+    func setCurrentGeohash(_ geohash: String?) {
+        currentGeohash = geohash?.lowercased()
+    }
+
+    func setNickname(_ nickname: String, for pubkeyHex: String) {
+        geoNicknames[pubkeyHex.lowercased()] = nickname
+    }
+
+    func replaceGeoNicknames(_ nicknames: [String: String]) {
+        geoNicknames = Dictionary(
+            uniqueKeysWithValues: nicknames.map { key, value in
+                (key.lowercased(), value)
+            }
+        )
+    }
+
+    func clearGeoNicknames() {
+        geoNicknames.removeAll()
+    }
+
+    func markTeleported(_ pubkeyHex: String) {
+        teleportedGeo.insert(pubkeyHex.lowercased())
+    }
+
+    func clearTeleported(_ pubkeyHex: String) {
+        teleportedGeo.remove(pubkeyHex.lowercased())
+    }
+
+    func replaceTeleportedGeo(_ pubkeys: Set<String>) {
+        teleportedGeo = Set(pubkeys.map { $0.lowercased() })
+    }
+
+    func clearTeleportedGeo() {
+        teleportedGeo.removeAll()
+    }
+
+    func reset() {
+        currentGeohash = nil
+        geoNicknames.removeAll()
+        teleportedGeo.removeAll()
+    }
+}

bitchat/App/PeerIdentityStore.swift

@@ -0,0 +1,125 @@
+import BitFoundation
+import Combine
+import Foundation
+
+@MainActor
+final class PeerIdentityStore: ObservableObject {
+    @Published private(set) var encryptionStatuses: [PeerID: EncryptionStatus] = [:]
+    @Published private(set) var verifiedFingerprints: Set<String> = []
+
+    private(set) var peerFingerprintsByPeerID: [PeerID: String] = [:]
+    private(set) var selectedPrivateChatFingerprint: String?
+
+    private var stablePeerIDsByShortID: [PeerID: PeerID] = [:]
+    private var encryptionStatusCache: [PeerID: EncryptionStatus] = [:]
+
+    func stablePeerID(forShortID peerID: PeerID) -> PeerID? {
+        stablePeerIDsByShortID[peerID]
+    }
+
+    func shortPeerID(forStablePeerID stablePeerID: PeerID) -> PeerID? {
+        stablePeerIDsByShortID.first(where: { $0.value == stablePeerID })?.key
+    }
+
+    func setStablePeerID(_ stablePeerID: PeerID, forShortID peerID: PeerID) {
+        stablePeerIDsByShortID[peerID] = stablePeerID
+    }
+
+    func replaceStablePeerIDs(_ mappings: [PeerID: PeerID]) {
+        stablePeerIDsByShortID = mappings
+    }
+
+    func fingerprint(for peerID: PeerID) -> String? {
+        peerFingerprintsByPeerID[peerID]
+    }
+
+    func setFingerprint(_ fingerprint: String?, for peerID: PeerID) {
+        if let fingerprint {
+            peerFingerprintsByPeerID[peerID] = fingerprint
+        } else {
+            peerFingerprintsByPeerID.removeValue(forKey: peerID)
+        }
+    }
+
+    func replaceFingerprintMappings(_ mappings: [PeerID: String]) {
+        peerFingerprintsByPeerID = mappings
+    }
+
+    @discardableResult
+    func migrateFingerprintMapping(
+        from oldPeerID: PeerID,
+        to newPeerID: PeerID,
+        fallback: String? = nil
+    ) -> String? {
+        let fingerprint = peerFingerprintsByPeerID.removeValue(forKey: oldPeerID) ?? fallback
+        if let fingerprint {
+            peerFingerprintsByPeerID[newPeerID] = fingerprint
+            if selectedPrivateChatFingerprint == nil {
+                selectedPrivateChatFingerprint = fingerprint
+            }
+        }
+        return fingerprint
+    }
+
+    func setSelectedPrivateChatFingerprint(_ fingerprint: String?) {
+        selectedPrivateChatFingerprint = fingerprint
+    }
+
+    func cachedEncryptionStatus(for peerID: PeerID) -> EncryptionStatus? {
+        encryptionStatusCache[peerID]
+    }
+
+    func setCachedEncryptionStatus(_ status: EncryptionStatus, for peerID: PeerID) {
+        encryptionStatusCache[peerID] = status
+    }
+
+    func invalidateEncryptionCache(for peerID: PeerID? = nil) {
+        if let peerID {
+            encryptionStatusCache.removeValue(forKey: peerID)
+        } else {
+            encryptionStatusCache.removeAll()
+        }
+    }
+
+    func encryptionStatus(for peerID: PeerID) -> EncryptionStatus? {
+        encryptionStatuses[peerID]
+    }
+
+    func setEncryptionStatus(_ status: EncryptionStatus?, for peerID: PeerID) {
+        if let status {
+            encryptionStatuses[peerID] = status
+        } else {
+            encryptionStatuses.removeValue(forKey: peerID)
+        }
+        invalidateEncryptionCache(for: peerID)
+    }
+
+    func replaceEncryptionStatuses(_ statuses: [PeerID: EncryptionStatus]) {
+        encryptionStatuses = statuses
+    }
+
+    func setVerifiedFingerprints(_ fingerprints: Set<String>) {
+        verifiedFingerprints = fingerprints
+    }
+
+    func setVerified(_ fingerprint: String, verified: Bool) {
+        if verified {
+            verifiedFingerprints.insert(fingerprint)
+        } else {
+            verifiedFingerprints.remove(fingerprint)
+        }
+    }
+
+    func isVerified(_ fingerprint: String) -> Bool {
+        verifiedFingerprints.contains(fingerprint)
+    }
+
+    func clearAll() {
+        encryptionStatuses.removeAll()
+        verifiedFingerprints.removeAll()
+        peerFingerprintsByPeerID.removeAll()
+        selectedPrivateChatFingerprint = nil
+        stablePeerIDsByShortID.removeAll()
+        encryptionStatusCache.removeAll()
+    }
+}

bitchat/App/PeerListModel.swift

@@ -0,0 +1,260 @@
+import BitFoundation
+import Combine
+import SwiftUI
+
+struct MeshPeerRow: Identifiable, Equatable {
+    let peerID: PeerID
+    let displayName: String
+    let isMe: Bool
+    let hasUnread: Bool
+    let isBlocked: Bool
+    let isFavorite: Bool
+    let isConnected: Bool
+    let isReachable: Bool
+    let isMutualFavorite: Bool
+    let encryptionStatus: EncryptionStatus
+    let showsVerifiedBadgeWhenOffline: Bool
+
+    var id: String { peerID.id }
+}
+
+struct GeohashPersonRow: Identifiable, Equatable {
+    let id: String
+    let displayName: String
+    let isMe: Bool
+    let isTeleported: Bool
+    let isBlocked: Bool
+}
+
+@MainActor
+final class PeerListModel: ObservableObject {
+    @Published private(set) var allPeers: [BitchatPeer] = []
+    @Published private(set) var meshRows: [MeshPeerRow] = []
+    @Published private(set) var geohashPeople: [GeohashPersonRow] = []
+    @Published private(set) var reachableMeshPeerCount = 0
+    @Published private(set) var connectedMeshPeerCount = 0
+    @Published private(set) var visibleGeohashPeerCount = 0
+    @Published private(set) var renderID = ""
+
+    private let chatViewModel: ChatViewModel
+    private let conversations: ConversationStore
+    private let locationChannelsModel: LocationChannelsModel
+    private let peerIdentityStore: PeerIdentityStore
+    private let locationPresenceStore: LocationPresenceStore
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        chatViewModel: ChatViewModel,
+        conversations: ConversationStore,
+        locationChannelsModel: LocationChannelsModel? = nil,
+        peerIdentityStore: PeerIdentityStore? = nil,
+        locationPresenceStore: LocationPresenceStore? = nil
+    ) {
+        self.chatViewModel = chatViewModel
+        self.conversations = conversations
+        self.locationChannelsModel = locationChannelsModel ?? LocationChannelsModel()
+        self.peerIdentityStore = peerIdentityStore ?? chatViewModel.peerIdentityStore
+        self.locationPresenceStore = locationPresenceStore ?? chatViewModel.locationPresenceStore
+        self.allPeers = chatViewModel.allPeers
+
+        bind()
+        refresh()
+    }
+
+    func colorForMeshPeer(id peerID: PeerID, isDark: Bool) -> Color {
+        chatViewModel.colorForMeshPeer(id: peerID, isDark: isDark)
+    }
+
+    func colorForGeohashPerson(id: String, isDark: Bool) -> Color {
+        chatViewModel.colorForNostrPubkey(id, isDark: isDark)
+    }
+
+    func participantCount(for geohash: String) -> Int {
+        chatViewModel.geohashParticipantCount(for: geohash)
+    }
+
+    func startConversation(with peerID: PeerID) {
+        chatViewModel.startPrivateChat(with: peerID)
+    }
+
+    func toggleFavorite(peerID: PeerID) {
+        chatViewModel.toggleFavorite(peerID: peerID)
+    }
+
+    func openGeohashDirectMessage(with pubkeyHex: String) {
+        chatViewModel.startGeohashDM(withPubkeyHex: pubkeyHex)
+    }
+
+    func blockGeohashUser(pubkeyHexLowercased: String, displayName: String) {
+        chatViewModel.blockGeohashUser(
+            pubkeyHexLowercased: pubkeyHexLowercased,
+            displayName: displayName
+        )
+    }
+
+    func unblockGeohashUser(pubkeyHexLowercased: String, displayName: String) {
+        chatViewModel.unblockGeohashUser(
+            pubkeyHexLowercased: pubkeyHexLowercased,
+            displayName: displayName
+        )
+    }
+
+    private func bind() {
+        chatViewModel.$allPeers
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] peers in
+                self?.allPeers = peers
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.$nickname
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        locationPresenceStore.$teleportedGeo
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        conversations.$unreadConversations
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        peerIdentityStore.$encryptionStatuses
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        peerIdentityStore.$verifiedFingerprints
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: Notification.Name("peerStatusUpdated"))
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.participantTracker.$visiblePeople
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        locationChannelsModel.$selectedChannel
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        locationChannelsModel.$teleported
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+
+        locationChannelsModel.$availableChannels
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refresh()
+            }
+            .store(in: &cancellables)
+    }
+
+    private func refresh() {
+        let myPeerID = chatViewModel.meshService.myPeerID
+        let meshRows = allPeers.map { peer in
+            let isMe = peer.peerID == myPeerID
+            let verifiedBadge: Bool
+            if !isMe && !peer.isConnected,
+               let fingerprint = chatViewModel.getFingerprint(for: peer.peerID) {
+                verifiedBadge = peerIdentityStore.isVerified(fingerprint)
+            } else {
+                verifiedBadge = false
+            }
+
+            return MeshPeerRow(
+                peerID: peer.peerID,
+                displayName: isMe ? chatViewModel.nickname : peer.nickname,
+                isMe: isMe,
+                hasUnread: chatViewModel.hasUnreadMessages(for: peer.peerID),
+                isBlocked: !isMe && chatViewModel.isPeerBlocked(peer.peerID),
+                isFavorite: peer.favoriteStatus?.isFavorite ?? false,
+                isConnected: peer.isConnected,
+                isReachable: peer.isReachable,
+                isMutualFavorite: peer.isMutualFavorite,
+                encryptionStatus: chatViewModel.getEncryptionStatus(for: peer.peerID),
+                showsVerifiedBadgeWhenOffline: verifiedBadge
+            )
+        }
+
+        let meshCounts = meshRows.reduce(into: (reachable: 0, connected: 0)) { counts, row in
+            guard !row.isMe else { return }
+            if row.isConnected {
+                counts.connected += 1
+                counts.reachable += 1
+            } else if row.isReachable {
+                counts.reachable += 1
+            }
+        }
+
+        let geohashPeople = buildGeohashPeople()
+
+        self.meshRows = meshRows
+        reachableMeshPeerCount = meshCounts.reachable
+        connectedMeshPeerCount = meshCounts.connected
+        self.geohashPeople = geohashPeople
+        visibleGeohashPeerCount = geohashPeople.count
+        renderID = (
+            meshRows.map {
+                "\($0.id)-\($0.isConnected)-\($0.isReachable)-\($0.hasUnread)-\($0.isFavorite)-\($0.isBlocked)"
+            } +
+            geohashPeople.map {
+                "geo:\($0.id)-\($0.isTeleported)-\($0.isBlocked)-\($0.displayName)"
+            }
+        ).joined(separator: "|")
+    }
+
+    private func buildGeohashPeople() -> [GeohashPersonRow] {
+        let myHex = currentGeohashIdentityHex()
+        let teleportedSet = Set(locationPresenceStore.teleportedGeo.map { $0.lowercased() })
+
+        return chatViewModel.visibleGeohashPeople().map { person in
+            let isMe = person.id == myHex
+            return GeohashPersonRow(
+                id: person.id,
+                displayName: person.displayName,
+                isMe: isMe,
+                isTeleported: teleportedSet.contains(person.id.lowercased()) || (isMe && locationChannelsModel.teleported),
+                isBlocked: !isMe && chatViewModel.isGeohashUserBlocked(pubkeyHexLowercased: person.id)
+            )
+        }
+    }
+
+    private func currentGeohashIdentityHex() -> String? {
+        guard case .location(let channel) = locationChannelsModel.selectedChannel,
+              let identity = try? chatViewModel.idBridge.deriveIdentity(forGeohash: channel.geohash) else {
+            return nil
+        }
+
+        return identity.publicKeyHex.lowercased()
+    }
+}

bitchat/App/PrivateConversationModels.swift

@@ -0,0 +1,323 @@
+import BitFoundation
+import Combine
+import Foundation
+
+/// Feature model for private (direct) conversations.
+///
+/// Reads the single-writer `ConversationStore` directly: `messages(for:)`
+/// returns the peer's conversation backing array (no mirror dictionary), and
+/// the store's typed `changes` subject drives invalidation — a change in the
+/// SELECTED peer's conversation republishes this model, while appends to
+/// other private chats only surface through the unread set. Direct
+/// conversations are keyed by raw routing peer ID; the coordinators'
+/// ephemeral/stable mirroring guarantees the selected peer's key always
+/// holds the full timeline (see `ConversationID.directPeer`).
+@MainActor
+final class PrivateInboxModel: ObservableObject {
+    @Published private(set) var selectedPeerID: PeerID?
+    @Published private(set) var unreadPeerIDs: Set<PeerID> = []
+
+    private let conversations: ConversationStore
+    private var cancellables = Set<AnyCancellable>()
+
+    init(conversations: ConversationStore) {
+        self.conversations = conversations
+        self.selectedPeerID = conversations.selectedPrivatePeerID
+        self.unreadPeerIDs = conversations.unreadDirectRoutingPeerIDs()
+
+        bind()
+    }
+
+    func messages(for peerID: PeerID?) -> [BitchatMessage] {
+        guard let peerID else { return [] }
+        return conversations.conversationsByID[.directPeer(peerID)]?.messages ?? []
+    }
+
+    private func bind() {
+        conversations.$selectedPrivatePeerID
+            .dropFirst()
+            .sink { [weak self] peerID in
+                guard let self, self.selectedPeerID != peerID else { return }
+                self.selectedPeerID = peerID
+            }
+            .store(in: &cancellables)
+
+        conversations.changes
+            .sink { [weak self] change in
+                self?.apply(change)
+            }
+            .store(in: &cancellables)
+    }
+
+    private func apply(_ change: ConversationChange) {
+        switch change {
+        case .appended(let id, _),
+             .updated(let id, _),
+             .statusChanged(let id, _, _),
+             .messageRemoved(let id, _),
+             .cleared(let id):
+            republishIfSelected(id)
+
+        case .unreadChanged(let id, _):
+            guard isDirect(id) else { return }
+            refreshUnreadPeerIDs()
+
+        case .removed(let id):
+            guard isDirect(id) else { return }
+            refreshUnreadPeerIDs()
+            republishIfSelected(id)
+
+        case .migrated(let source, let destination):
+            guard isDirect(source) || isDirect(destination) else { return }
+            refreshUnreadPeerIDs()
+            republishIfSelected(source)
+            republishIfSelected(destination)
+        }
+    }
+
+    private func republishIfSelected(_ id: ConversationID) {
+        guard let selectedPeerID, id == .directPeer(selectedPeerID) else { return }
+        objectWillChange.send()
+    }
+
+    private func refreshUnreadPeerIDs() {
+        let next = conversations.unreadDirectRoutingPeerIDs()
+        guard unreadPeerIDs != next else { return }
+        unreadPeerIDs = next
+    }
+
+    private func isDirect(_ id: ConversationID) -> Bool {
+        if case .direct = id { return true }
+        return false
+    }
+}
+
+enum PrivateConversationAvailability: Equatable {
+    case bluetoothConnected
+    case meshReachable
+    case nostrAvailable
+    case offline
+}
+
+struct PrivateConversationHeaderState: Equatable {
+    let conversationPeerID: PeerID
+    let headerPeerID: PeerID
+    let displayName: String
+    let availability: PrivateConversationAvailability
+    let isFavorite: Bool
+    let encryptionStatus: EncryptionStatus?
+
+    var supportsFavoriteToggle: Bool {
+        !conversationPeerID.isGeoDM
+    }
+}
+
+@MainActor
+final class PrivateConversationModel: ObservableObject {
+    @Published private(set) var selectedPeerID: PeerID?
+    @Published private(set) var selectedHeaderState: PrivateConversationHeaderState?
+
+    private let chatViewModel: ChatViewModel
+    private let conversations: ConversationStore
+    private let locationChannelsModel: LocationChannelsModel
+    private let peerIdentityStore: PeerIdentityStore
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        chatViewModel: ChatViewModel,
+        conversations: ConversationStore,
+        locationChannelsModel: LocationChannelsModel? = nil,
+        peerIdentityStore: PeerIdentityStore? = nil
+    ) {
+        self.chatViewModel = chatViewModel
+        self.conversations = conversations
+        self.locationChannelsModel = locationChannelsModel ?? LocationChannelsModel()
+        self.peerIdentityStore = peerIdentityStore ?? chatViewModel.peerIdentityStore
+        let initialPeerID = conversations.selectedPrivatePeerID
+        self.selectedPeerID = initialPeerID
+        self.selectedHeaderState = initialPeerID.flatMap { peerID in
+            makeHeaderState(for: peerID)
+        }
+
+        bind()
+    }
+
+    func startConversation(with peerID: PeerID) {
+        chatViewModel.startPrivateChat(with: peerID)
+        refreshSelectedConversation()
+    }
+
+    func openConversation(for peerID: PeerID) {
+        if peerID.isGeoChat {
+            guard let full = chatViewModel.fullNostrHex(forSenderPeerID: peerID) else { return }
+            chatViewModel.startGeohashDM(withPubkeyHex: full)
+        } else {
+            chatViewModel.startPrivateChat(with: peerID)
+        }
+
+        refreshSelectedConversation()
+    }
+
+    func endConversation() {
+        chatViewModel.endPrivateChat()
+        refreshSelectedConversation()
+    }
+
+    func toggleFavorite(peerID: PeerID) {
+        chatViewModel.toggleFavorite(peerID: peerID)
+        refreshSelectedConversation()
+    }
+
+    func toggleFavoriteForSelectedConversation() {
+        guard let headerPeerID = selectedHeaderState?.headerPeerID else { return }
+        toggleFavorite(peerID: headerPeerID)
+    }
+
+    func markMessagesAsRead(from peerID: PeerID) {
+        chatViewModel.markPrivateMessagesAsRead(from: peerID)
+    }
+
+    private func bind() {
+        conversations.$selectedPrivatePeerID
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.$allPeers
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+
+        peerIdentityStore.$encryptionStatuses
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: .favoriteStatusChanged)
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+
+        NotificationCenter.default.publisher(for: Notification.Name("peerStatusUpdated"))
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+
+        locationChannelsModel.$selectedChannel
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.refreshSelectedConversation()
+            }
+            .store(in: &cancellables)
+    }
+
+    private func refreshSelectedConversation() {
+        selectedPeerID = conversations.selectedPrivatePeerID
+        selectedHeaderState = selectedPeerID.flatMap { peerID in
+            makeHeaderState(for: peerID)
+        }
+    }
+
+    private func makeHeaderState(for conversationPeerID: PeerID) -> PrivateConversationHeaderState {
+        let headerPeerID = chatViewModel.getShortIDForNoiseKey(conversationPeerID)
+        let peer = chatViewModel.getPeer(byID: headerPeerID)
+        let displayName = resolveDisplayName(for: conversationPeerID, headerPeerID: headerPeerID, peer: peer)
+        let availability = resolveAvailability(for: headerPeerID, peer: peer)
+        let encryptionStatus: EncryptionStatus? = conversationPeerID.isGeoDM
+            ? nil
+            : chatViewModel.getEncryptionStatus(for: headerPeerID)
+
+        return PrivateConversationHeaderState(
+            conversationPeerID: conversationPeerID,
+            headerPeerID: headerPeerID,
+            displayName: displayName,
+            availability: availability,
+            isFavorite: chatViewModel.isFavorite(peerID: headerPeerID),
+            encryptionStatus: encryptionStatus
+        )
+    }
+
+    private func resolveDisplayName(
+        for conversationPeerID: PeerID,
+        headerPeerID: PeerID,
+        peer: BitchatPeer?
+    ) -> String {
+        if conversationPeerID.isGeoDM, case .location(let channel) = locationChannelsModel.selectedChannel {
+            return "#\(channel.geohash)/@\(chatViewModel.geohashDisplayName(for: conversationPeerID))"
+        }
+        if let displayName = peer?.displayName {
+            return displayName
+        }
+        if let nickname = chatViewModel.meshService.peerNickname(peerID: headerPeerID) {
+            return nickname
+        }
+        if let favorite = FavoritesPersistenceService.shared.getFavoriteStatus(
+            for: Data(hexString: headerPeerID.id) ?? Data()
+        ), !favorite.peerNickname.isEmpty {
+            return favorite.peerNickname
+        }
+        if headerPeerID.id.count == 16 {
+            let candidates = chatViewModel.identityManager.getCryptoIdentitiesByPeerIDPrefix(headerPeerID)
+            if let identity = candidates.first,
+               let social = chatViewModel.identityManager.getSocialIdentity(for: identity.fingerprint) {
+                if let pet = social.localPetname, !pet.isEmpty {
+                    return pet
+                }
+                if !social.claimedNickname.isEmpty {
+                    return social.claimedNickname
+                }
+            }
+        } else if let noiseKey = headerPeerID.noiseKey {
+            let fingerprint = noiseKey.sha256Fingerprint()
+            if let social = chatViewModel.identityManager.getSocialIdentity(for: fingerprint) {
+                if let pet = social.localPetname, !pet.isEmpty {
+                    return pet
+                }
+                if !social.claimedNickname.isEmpty {
+                    return social.claimedNickname
+                }
+            }
+        }
+
+        return String(localized: "common.unknown", comment: "Fallback label for unknown peer")
+    }
+
+    private func resolveAvailability(for headerPeerID: PeerID, peer: BitchatPeer?) -> PrivateConversationAvailability {
+        if let connectionState = peer?.connectionState {
+            switch connectionState {
+            case .bluetoothConnected:
+                return .bluetoothConnected
+            case .meshReachable:
+                return .meshReachable
+            case .nostrAvailable:
+                return .nostrAvailable
+            case .offline:
+                return .offline
+            }
+        }
+
+        if chatViewModel.meshService.isPeerReachable(headerPeerID) {
+            return .meshReachable
+        }
+        if let noiseKey = Data(hexString: headerPeerID.id),
+           let favoriteStatus = FavoritesPersistenceService.shared.getFavoriteStatus(for: noiseKey),
+           favoriteStatus.isMutual {
+            return .nostrAvailable
+        }
+        if chatViewModel.meshService.isPeerConnected(headerPeerID) || chatViewModel.connectedPeers.contains(headerPeerID) {
+            return .bluetoothConnected
+        }
+
+        return .offline
+    }
+}

bitchat/App/PublicChatModel.swift

@@ -0,0 +1,77 @@
+import BitFoundation
+import Combine
+import SwiftUI
+
+/// Feature model for the active public (mesh/geohash) timeline.
+///
+/// Observes ONE `Conversation` object in the single-writer
+/// `ConversationStore` — the active channel's — so appends to background
+/// conversations (other geohashes, private chats) never invalidate it.
+/// `messages` reads the observed conversation's backing array directly;
+/// there is no mirror copy.
+@MainActor
+final class PublicChatModel: ObservableObject {
+    @Published private(set) var activeChannel: ChannelID
+
+    /// The active public conversation's timeline.
+    var messages: [BitchatMessage] { activeConversation.messages }
+
+    private let conversations: ConversationStore
+    private var activeConversation: Conversation
+    private var activeConversationCancellable: AnyCancellable?
+    private var cancellables = Set<AnyCancellable>()
+
+    init(conversations: ConversationStore) {
+        let channel = conversations.activeChannel
+        self.conversations = conversations
+        self.activeChannel = channel
+        self.activeConversation = conversations.conversation(for: ConversationID(channelID: channel))
+
+        observeActiveConversation()
+        bind()
+    }
+
+    private func bind() {
+        conversations.$activeChannel
+            .dropFirst()
+            .sink { [weak self] channel in
+                guard let self else { return }
+                self.activeChannel = channel
+                self.retargetActiveConversation(to: channel)
+            }
+            .store(in: &cancellables)
+
+        // The store replaces a conversation's object when it is removed
+        // (panic clear); retarget to the fresh instance so the observation
+        // never goes stale.
+        conversations.changes
+            .sink { [weak self] change in
+                guard let self,
+                      case .removed(let id) = change,
+                      id == self.activeConversation.id else { return }
+                self.retargetActiveConversation(to: self.activeChannel)
+            }
+            .store(in: &cancellables)
+    }
+
+    private func retargetActiveConversation(to channel: ChannelID) {
+        let conversation = conversations.conversation(for: ConversationID(channelID: channel))
+        guard conversation !== activeConversation else {
+            // Same object (e.g. re-selected channel): keep the existing
+            // observation, but `messages` may still differ from what views
+            // last rendered, so republish.
+            objectWillChange.send()
+            return
+        }
+        objectWillChange.send()
+        activeConversation = conversation
+        observeActiveConversation()
+    }
+
+    private func observeActiveConversation() {
+        activeConversationCancellable = activeConversation.objectWillChange
+            .sink { [weak self] _ in
+                self?.objectWillChange.send()
+            }
+    }
+}

bitchat/App/VerificationModel.swift

@@ -0,0 +1,152 @@
+import BitFoundation
+import Combine
+import Foundation
+
+struct FingerprintPresentationState: Equatable {
+    let statusPeerID: PeerID
+    let peerNickname: String
+    let encryptionStatus: EncryptionStatus
+    let theirFingerprint: String?
+    let myFingerprint: String
+    let isVerified: Bool
+
+    var canToggleVerification: Bool {
+        encryptionStatus == .noiseSecured || encryptionStatus == .noiseVerified
+    }
+}
+
+enum VerificationScanOutcome: Equatable {
+    case requested(String)
+    case notFound
+    case invalid
+}
+
+@MainActor
+final class VerificationModel: ObservableObject {
+    @Published private(set) var currentNickname: String
+    @Published private(set) var selectedPeerID: PeerID?
+
+    private let chatViewModel: ChatViewModel
+    private let peerIdentityStore: PeerIdentityStore
+    private var cancellables = Set<AnyCancellable>()
+
+    init(
+        chatViewModel: ChatViewModel,
+        privateConversationModel: PrivateConversationModel,
+        peerIdentityStore: PeerIdentityStore? = nil
+    ) {
+        self.chatViewModel = chatViewModel
+        self.peerIdentityStore = peerIdentityStore ?? chatViewModel.peerIdentityStore
+        self.currentNickname = chatViewModel.nickname
+        self.selectedPeerID = privateConversationModel.selectedPeerID
+
+        bind(privateConversationModel: privateConversationModel)
+    }
+
+    func myQRString() -> String {
+        let npub = try? chatViewModel.idBridge.getCurrentNostrIdentity()?.npub
+        return VerificationService.shared.buildMyQRString(nickname: currentNickname, npub: npub) ?? ""
+    }
+
+    func beginQRVerification(with qr: VerificationService.VerificationQR) -> Bool {
+        chatViewModel.beginQRVerification(with: qr)
+    }
+
+    func verifyScannedPayload(_ payload: String) -> VerificationScanOutcome {
+        guard let qr = VerificationService.shared.verifyScannedQR(payload) else {
+            return .invalid
+        }
+
+        guard chatViewModel.beginQRVerification(with: qr) else {
+            return .notFound
+        }
+
+        return .requested(qr.nickname)
+    }
+
+    func verifyFingerprint(for peerID: PeerID) {
+        chatViewModel.verifyFingerprint(for: peerID)
+    }
+
+    func unverifyFingerprint(for peerID: PeerID) {
+        chatViewModel.unverifyFingerprint(for: peerID)
+    }
+
+    func isVerified(peerID: PeerID) -> Bool {
+        guard let fingerprint = chatViewModel.getFingerprint(for: peerID) else { return false }
+        return peerIdentityStore.isVerified(fingerprint)
+    }
+
+    func fingerprintPresentation(for peerID: PeerID) -> FingerprintPresentationState {
+        let statusPeerID = chatViewModel.getShortIDForNoiseKey(peerID)
+        let encryptionStatus = chatViewModel.getEncryptionStatus(for: statusPeerID)
+        let theirFingerprint = chatViewModel.getFingerprint(for: statusPeerID)
+        let peerNickname = resolveDisplayName(for: peerID, statusPeerID: statusPeerID)
+
+        return FingerprintPresentationState(
+            statusPeerID: statusPeerID,
+            peerNickname: peerNickname,
+            encryptionStatus: encryptionStatus,
+            theirFingerprint: theirFingerprint,
+            myFingerprint: chatViewModel.getMyFingerprint(),
+            isVerified: theirFingerprint.map { peerIdentityStore.isVerified($0) } ?? false
+        )
+    }
+
+    private func bind(privateConversationModel: PrivateConversationModel) {
+        chatViewModel.$nickname
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$currentNickname)
+
+        privateConversationModel.$selectedPeerID
+            .receive(on: DispatchQueue.main)
+            .assign(to: &$selectedPeerID)
+
+        peerIdentityStore.$encryptionStatuses
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.objectWillChange.send()
+            }
+            .store(in: &cancellables)
+
+        peerIdentityStore.$verifiedFingerprints
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.objectWillChange.send()
+            }
+            .store(in: &cancellables)
+
+        chatViewModel.$allPeers
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.objectWillChange.send()
+            }
+            .store(in: &cancellables)
+    }
+
+    private func resolveDisplayName(for peerID: PeerID, statusPeerID: PeerID) -> String {
+        if let peer = chatViewModel.getPeer(byID: statusPeerID) {
+            return peer.displayName
+        }
+        if let name = chatViewModel.meshService.peerNickname(peerID: statusPeerID) {
+            return name
+        }
+        if let data = peerID.noiseKey {
+            if let favorite = FavoritesPersistenceService.shared.getFavoriteStatus(for: data),
+               !favorite.peerNickname.isEmpty {
+                return favorite.peerNickname
+            }
+            let fingerprint = data.sha256Fingerprint()
+            if let social = chatViewModel.identityManager.getSocialIdentity(for: fingerprint) {
+                if let pet = social.localPetname, !pet.isEmpty {
+                    return pet
+                }
+                if !social.claimedNickname.isEmpty {
+                    return social.claimedNickname
+                }
+            }
+        }
+
+        return String(localized: "common.unknown", comment: "Label for an unknown peer")
+    }
+}

bitchat/BitchatApp.swift

@@ -6,131 +6,57 @@
 // For more information, see <https://unlicense.org>
 //
 
-import Nostr
-import Tor
 import SwiftUI
-import BitFoundation
 import UserNotifications
 
 @main
 struct BitchatApp: App {
     static let bundleID = Bundle.main.bundleIdentifier ?? "chat.bitchat"
     static let groupID = "group.\(bundleID)"
-    
-    @StateObject private var chatViewModel: ChatViewModel
+
+    @StateObject private var runtime: AppRuntime
+    @AppStorage(AppTheme.storageKey) private var appThemeRawValue = AppTheme.matrix.rawValue
     #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(keychain: KeychainManager())
-    
+
     init() {
-        GeoRelayDirectory.setupShared(dependencies: .live())
-        NostrRelayManager.setupShared(dependencies: .live())
-        let keychain = KeychainManager()
-        let idBridge = self.idBridge
-        _chatViewModel = StateObject(
-            wrappedValue: ChatViewModel(
-                keychain: keychain,
-                idBridge: idBridge,
-                identityManager: SecureIdentityStateManager(keychain)
-            )
-        )
-        
+        _runtime = StateObject(wrappedValue: AppRuntime())
         UNUserNotificationCenter.current().delegate = NotificationDelegate.shared
-        // Warm up georelay directory and refresh if stale (once/day)
-        GeoRelayDirectory.shared.prefetchIfNeeded()
     }
-    
+
     var body: some Scene {
         WindowGroup {
             ContentView()
-                .environmentObject(chatViewModel)
+                .environment(\.appTheme, AppTheme(rawValue: appThemeRawValue) ?? .matrix)
+                .environmentObject(runtime.publicChatModel)
+                .environmentObject(runtime.privateInboxModel)
+                .environmentObject(runtime.privateConversationModel)
+                .environmentObject(runtime.verificationModel)
+                .environmentObject(runtime.conversationUIModel)
+                .environmentObject(runtime.locationChannelsModel)
+                .environmentObject(runtime.peerListModel)
+                .environmentObject(runtime.appChromeModel)
                 .onAppear {
-                    NotificationDelegate.shared.chatViewModel = chatViewModel
-                    // 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
-
-                    // Initialize network activation policy; will start Tor/Nostr only when allowed
-                    NetworkActivationService.shared.start()
-                    
-                    // Start presence service (will wait for Tor readiness)
-                    GeohashPresenceService.shared.start()
-
-                    // Check for shared content
-                    checkForSharedContent()
+                    appDelegate.runtime = runtime
+                    runtime.start()
                 }
                 .onOpenURL { url in
-                    handleURL(url)
+                    runtime.handleOpenURL(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
-                    }
+                    runtime.handleScenePhaseChange(newPhase)
                 }
                 .onReceive(NotificationCenter.default.publisher(for: UIApplication.didBecomeActiveNotification)) { _ in
-                    // Check for shared content when app becomes active
-                    checkForSharedContent()
+                    runtime.handleDidBecomeActiveNotification()
                 }
                 #elseif os(macOS)
                 .onReceive(NotificationCenter.default.publisher(for: NSApplication.didBecomeActiveNotification)) { _ in
-                    // App became active
+                    runtime.handleMacDidBecomeActiveNotification()
                 }
                 #endif
         }
@@ -139,66 +65,18 @@ struct BitchatApp: App {
         .windowResizability(.contentSize)
         #endif
     }
-    
-    private func handleURL(_ url: URL) {
-        if url.scheme == "bitchat" && url.host == "share" {
-            // Handle shared content
-            checkForSharedContent()
-        }
-    }
-    
-    private func checkForSharedContent() {
-        // Check app group for shared content from extension
-        guard let userDefaults = UserDefaults(suiteName: BitchatApp.groupID) else {
-            return
-        }
-        
-        guard let sharedContent = userDefaults.string(forKey: "sharedContent"),
-              let sharedDate = userDefaults.object(forKey: "sharedContentDate") as? Date else {
-            return
-        }
-        
-        // 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")
-            // No need to force synchronize here
-            
-            // Send the shared content immediately on the main queue
-            DispatchQueue.main.async {
-                if contentType == "url" {
-                    // Try to parse as JSON first
-                    if let data = sharedContent.data(using: .utf8),
-                       let urlData = try? JSONSerialization.jsonObject(with: data) as? [String: String],
-                       let url = urlData["url"] {
-                        // Send plain URL
-                        self.chatViewModel.sendMessage(url)
-                    } else {
-                        // Fallback to simple URL
-                        self.chatViewModel.sendMessage(sharedContent)
-                    }
-                } else {
-                    self.chatViewModel.sendMessage(sharedContent)
-                }
-            }
-        }
-    }
 }
 
 #if os(iOS)
 final class AppDelegate: NSObject, UIApplicationDelegate {
-    weak var chatViewModel: ChatViewModel?
-    
+    weak var runtime: AppRuntime?
+
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
-        return true
+        true
     }
-    
+
     func applicationWillTerminate(_ application: UIApplication) {
-        chatViewModel?.applicationWillTerminate()
+        runtime?.applicationWillTerminate()
     }
 }
 #endif
@@ -207,79 +85,42 @@ final class AppDelegate: NSObject, UIApplicationDelegate {
 import AppKit
 
 final class MacAppDelegate: NSObject, NSApplicationDelegate {
-    weak var chatViewModel: ChatViewModel?
-    
+    weak var runtime: AppRuntime?
+
     func applicationWillTerminate(_ notification: Notification) {
-        chatViewModel?.applicationWillTerminate()
+        runtime?.applicationWillTerminate()
     }
-    
+
     func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
-        return true
+        true
     }
 }
 #endif
 
 final class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
     static let shared = NotificationDelegate()
-    weak var chatViewModel: ChatViewModel?
-    
+    weak var runtime: AppRuntime?
+
     func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
         let identifier = response.notification.request.identifier
         let userInfo = response.notification.request.content.userInfo
-        
-        // Check if this is a private message notification
-        if identifier.hasPrefix("private-") {
-            // Get peer ID from userInfo
-            if let peerID = userInfo["peerID"] as? String {
-                DispatchQueue.main.async {
-                    self.chatViewModel?.startPrivateChat(with: PeerID(str: peerID))
-                }
-            }
+
+        Task { @MainActor in
+            self.runtime?.handleNotificationResponse(identifier: identifier, userInfo: userInfo)
         }
-        // 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()
     }
-    
+
     func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
         let identifier = notification.request.identifier
         let userInfo = notification.request.content.userInfo
-        
-        // Check if this is a private message notification
-        if identifier.hasPrefix("private-") {
-            // Get peer ID from userInfo
-            if let peerID = userInfo["peerID"] as? String {
-                // Don't show notification if the private chat is already open
-                // Access main-actor-isolated property via Task
-                Task { @MainActor in
-                    if self.chatViewModel?.selectedPrivateChatPeer == PeerID(str: peerID) {
-                        completionHandler([])
-                    } else {
-                        completionHandler([.banner, .sound])
-                    }
-                }
-                return
-            }
+
+        Task {
+            let options = await self.runtime?.presentationOptions(
+                forNotificationIdentifier: identifier,
+                userInfo: userInfo
+            ) ?? [.banner, .sound]
+            completionHandler(options)
         }
-        // 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
-            }
-        }
-        
-        // Show notification in all other cases
-        completionHandler([.banner, .sound])
     }
 }
-

bitchat/Features/media/ImageUtils.swift

@@ -15,30 +15,39 @@ enum ImageUtilsError: Error {
 enum ImageUtils {
     private static let compressionQuality: CGFloat = 0.82
     private static let targetImageBytes: Int = 45_000
+    private static let maxSourceImageBytes: Int = 10 * 1024 * 1024
 
-    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
-        }
+    static func processImage(at url: URL, maxDimension: CGFloat = 448, outputDirectory: URL? = nil) throws -> URL {
+        try validateImageSource(at: url)
 
         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)
+        return try processImage(image, maxDimension: maxDimension, outputDirectory: outputDirectory)
         #else
         guard let image = NSImage(data: data) else { throw ImageUtilsError.invalidImage }
-        return try processImage(image, maxDimension: maxDimension)
+        return try processImage(image, maxDimension: maxDimension, outputDirectory: outputDirectory)
         #endif
     }
 
+    static func validateImageSource(at url: URL) throws {
+        // 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,
+              fileSize > 0,
+              fileSize <= maxSourceImageBytes else {
+            throw ImageUtilsError.invalidImage
+        }
+
+        let options = [kCGImageSourceShouldCache: false] as CFDictionary
+        guard let source = CGImageSourceCreateWithURL(url as CFURL, options),
+              CGImageSourceGetType(source) != nil else {
+            throw ImageUtilsError.invalidImage
+        }
+    }
+
     #if os(iOS)
-    static func processImage(_ image: UIImage, maxDimension: CGFloat = 448) throws -> URL {
+    static func processImage(_ image: UIImage, maxDimension: CGFloat = 448, outputDirectory: URL? = nil) throws -> URL {
         return try autoreleasepool {
             // Scale the image first
             let scaled = scaledImage(image, maxDimension: maxDimension)
@@ -64,7 +73,7 @@ enum ImageUtils {
                 }
             }
 
-            let outputURL = try makeOutputURL()
+            let outputURL = try makeOutputURL(outputDirectory: outputDirectory)
             try jpegData.write(to: outputURL, options: .atomic)
             return outputURL
         }
@@ -106,7 +115,7 @@ enum ImageUtils {
         return data as Data
     }
     #else
-    static func processImage(_ image: NSImage, maxDimension: CGFloat = 448) throws -> URL {
+    static func processImage(_ image: NSImage, maxDimension: CGFloat = 448, outputDirectory: URL? = nil) throws -> URL {
         return try autoreleasepool {
             let scaled = scaledImage(image, maxDimension: maxDimension)
             guard let inputCG = scaled.cgImage(forProposedRect: nil, context: nil, hints: nil) else {
@@ -142,7 +151,7 @@ enum ImageUtils {
                     }
                 }
             }
-            let outputURL = try makeOutputURL()
+            let outputURL = try makeOutputURL(outputDirectory: outputDirectory)
             try jpegData.write(to: outputURL, options: .atomic)
             return outputURL
         }
@@ -186,12 +195,17 @@ enum ImageUtils {
     }
     #endif
 
-    private static func makeOutputURL() throws -> URL {
+    private static func makeOutputURL(outputDirectory: URL? = nil) throws -> URL {
         let formatter = DateFormatter()
         formatter.dateFormat = "yyyyMMdd_HHmmss"
-        let fileName = "img_\(formatter.string(from: Date())).jpg"
+        let fileName = "img_\(formatter.string(from: Date()))_\(UUID().uuidString).jpg"
 
-        let directory = try applicationFilesDirectory().appendingPathComponent("images/outgoing", isDirectory: true)
+        let directory: URL
+        if let outputDirectory {
+            directory = outputDirectory
+        } else {
+            directory = try applicationFilesDirectory().appendingPathComponent("images/outgoing", isDirectory: true)
+        }
         try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true, attributes: nil)
         return directory.appendingPathComponent(fileName)
     }

bitchat/Identity/SecureIdentityStateManager.swift

@@ -151,38 +151,68 @@ final class SecureIdentityStateManager: SecureIdentityStateManagerProtocol {
     // Thread safety
     private let queue = DispatchQueue(label: "bitchat.identity.state", attributes: .concurrent)
     
-    // Debouncing for keychain saves
-    private var saveTimer: Timer?
-    private let saveDebounceInterval: TimeInterval = 2.0  // Save at most once every 2 seconds
+    // Pending-save coalescing flag. Reads/writes are serialized on `queue`.
+    // Persistence is done with a fire-and-forget `queue.async(.barrier)` rather
+    // than a retained DispatchSourceTimer: a lingering, never-cancelled timer
+    // keeps the dispatch machinery alive and prevents the unit-test process from
+    // exiting. (The original code used Timer.scheduledTimer on a GCD queue with
+    // no run loop, so saves never actually fired.)
     private var pendingSave = false
-    
+
     // Encryption key
     private let encryptionKey: SymmetricKey
+    /// True when `encryptionKey` is a throwaway generated this session because the
+    /// persisted key could not be read (device locked / access denied). In that
+    /// state we must NOT persist (it would overwrite the real cache with data the
+    /// next launch can't decrypt) and must NOT delete the existing cache.
+    private let encryptionKeyIsEphemeral: Bool
     
     init(_ keychain: KeychainManagerProtocol) {
         self.keychain = keychain
-        
-        // Generate or retrieve encryption key from keychain
+
+        // Retrieve (or, only on genuine first run, generate) the cache
+        // encryption key. We MUST distinguish "key doesn't exist yet" from a
+        // transient failure (device locked / access denied): the legacy
+        // getIdentityKey(forKey:) collapses both to nil, and generating+saving a
+        // new key deletes the existing one first — permanently orphaning the
+        // encrypted cache on a launch that merely couldn't read the key.
         let loadedKey: SymmetricKey
-        
-        // Try to load from keychain
-        if let keyData = keychain.getIdentityKey(forKey: encryptionKeyName) {
+        let keyIsEphemeral: Bool
+
+        switch keychain.getIdentityKeyWithResult(forKey: encryptionKeyName) {
+        case .success(let keyData):
             loadedKey = SymmetricKey(data: keyData)
+            keyIsEphemeral = false
             SecureLogger.logKeyOperation(.load, keyType: "identity cache encryption key", success: true)
-        }
-        // Generate new key if needed
-        else {
-            loadedKey = SymmetricKey(size: .bits256)
-            let keyData = loadedKey.withUnsafeBytes { Data($0) }
-            // Save to keychain
+
+        case .itemNotFound:
+            // Genuine first run: generate and persist a new key.
+            let newKey = SymmetricKey(size: .bits256)
+            let keyData = newKey.withUnsafeBytes { Data($0) }
             let saved = keychain.saveIdentityKey(keyData, forKey: encryptionKeyName)
+            loadedKey = newKey
+            // If even the save failed, treat the key as ephemeral so we don't
+            // later try to persist a cache the next launch can't read.
+            keyIsEphemeral = !saved
             SecureLogger.logKeyOperation(.generate, keyType: "identity cache encryption key", success: saved)
+
+        case .deviceLocked, .authenticationFailed, .accessDenied, .otherError:
+            // Transient/critical read failure. Do NOT overwrite the persisted
+            // key. Use a session-only ephemeral key; the real key and cache are
+            // left intact for a healthy launch.
+            SecureLogger.warning("Identity cache key unavailable; using ephemeral key for this session (not persisting)", category: .security)
+            loadedKey = SymmetricKey(size: .bits256)
+            keyIsEphemeral = true
         }
-        
+
         self.encryptionKey = loadedKey
-        
-        // Load identity cache on init
-        loadIdentityCache()
+        self.encryptionKeyIsEphemeral = keyIsEphemeral
+
+        // Only read the persisted cache when we hold the real key; with an
+        // ephemeral key the decrypt would fail and discard the real cache.
+        if !keyIsEphemeral {
+            loadIdentityCache()
+        }
     }
     
     deinit {
@@ -202,28 +232,37 @@ final class SecureIdentityStateManager: SecureIdentityStateManagerProtocol {
             let decryptedData = try AES.GCM.open(sealedBox, using: encryptionKey)
             cache = try JSONDecoder().decode(IdentityCache.self, from: decryptedData)
         } catch {
-            // Log error but continue with empty cache
-            SecureLogger.error(error, context: "Failed to load identity cache", category: .security)
+            cache = IdentityCache()
+            let deleted = keychain.deleteIdentityKey(forKey: cacheKey)
+            SecureLogger.warning(
+                "Discarded unreadable identity cache; starting fresh (deleted=\(deleted), error=\(error.localizedDescription))",
+                category: .security
+            )
         }
     }
     
+    /// Persists the cache. Always invoked on `queue` under a barrier (its callers
+    /// run inside `queue.async(.barrier)`), so it simply marks the cache dirty
+    /// and persists it on the same serialized context — no timer, nothing left
+    /// scheduled to keep the process alive.
     private func saveIdentityCache() {
-        // Mark that we need to save
         pendingSave = true
-        
-        // Cancel any existing timer
-        saveTimer?.invalidate()
-        
-        // Schedule a new save after the debounce interval
-        saveTimer = Timer.scheduledTimer(withTimeInterval: saveDebounceInterval, repeats: false) { [weak self] _ in
-            self?.performSave()
-        }
+        performSave()
     }
-    
+
+    /// Writes the cache to the keychain. Must run on `queue` with exclusive
+    /// (barrier) access.
     private func performSave() {
         guard pendingSave else { return }
         pendingSave = false
-        
+
+        // Never persist under an ephemeral key — it would overwrite the real
+        // cache with data the next launch cannot decrypt.
+        guard !encryptionKeyIsEphemeral else {
+            SecureLogger.debug("Skipping identity cache save (ephemeral key this session)", category: .security)
+            return
+        }
+
         do {
             let data = try JSONEncoder().encode(cache)
             let sealedBox = try AES.GCM.seal(data, using: encryptionKey)
@@ -235,10 +274,14 @@ final class SecureIdentityStateManager: SecureIdentityStateManagerProtocol {
             SecureLogger.error(error, context: "Failed to save identity cache", category: .security)
         }
     }
-    
-    // Force immediate save (for app termination)
+
+    // Force immediate save (for app termination / lifecycle events). Mutations
+    // already persist synchronously via saveIdentityCache, so this is normally a
+    // no-op (performSave early-returns when nothing is pending). Runs directly on
+    // the caller's thread — deliberately NOT a `queue.sync(barrier)`, which is
+    // reachable from `deinit` and from async tests on the swift-concurrency
+    // cooperative pool where a blocking barrier-sync can starve/deadlock it.
     func forceSave() {
-        saveTimer?.invalidate()
         performSave()
     }
     

bitchat/Localizable.xcstrings

@@ -540,6 +540,543 @@
         }
       }
     },
+    "app_info.appearance.liquid_glass" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "ar" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "زجاج سائل"
+          }
+        },
+        "bn" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "লিকুইড গ্লাস"
+          }
+        },
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "fil" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "he" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "זכוכית נוזלית"
+          }
+        },
+        "hi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "लिक्विड ग्लास"
+          }
+        },
+        "id" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "it" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "ja" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "リキッドガラス"
+          }
+        },
+        "ko" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "리퀴드 글래스"
+          }
+        },
+        "ms" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "ne" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "लिक्विड ग्लास"
+          }
+        },
+        "nl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "pl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "pt" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "pt-BR" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "ru" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "жидкое стекло"
+          }
+        },
+        "sv" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "ta" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "லிக்விட் கிளாஸ்"
+          }
+        },
+        "th" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ลิควิดกลาส"
+          }
+        },
+        "tr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "uk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "рідке скло"
+          }
+        },
+        "ur" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "لیکویڈ گلاس"
+          }
+        },
+        "vi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "liquid glass"
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "液态玻璃"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "液態玻璃"
+          }
+        }
+      }
+    },
+    "app_info.appearance.matrix" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "ar" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ماتريكس"
+          }
+        },
+        "bn" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ম্যাট্রিক্স"
+          }
+        },
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "fil" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "he" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "מטריקס"
+          }
+        },
+        "hi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "मैट्रिक्स"
+          }
+        },
+        "id" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "it" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "ja" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "マトリックス"
+          }
+        },
+        "ko" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "매트릭스"
+          }
+        },
+        "ms" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "ne" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "म्याट्रिक्स"
+          }
+        },
+        "nl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "pl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "pt" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "pt-BR" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "ru" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "матрица"
+          }
+        },
+        "sv" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "ta" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "மேட்ரிக்ஸ்"
+          }
+        },
+        "th" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "เมทริกซ์"
+          }
+        },
+        "tr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "uk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "матриця"
+          }
+        },
+        "ur" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "میٹرکس"
+          }
+        },
+        "vi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "matrix"
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "矩阵"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "矩陣"
+          }
+        }
+      }
+    },
+    "app_info.appearance.title" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "ar" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "المظهر"
+          }
+        },
+        "bn" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "চেহারা"
+          }
+        },
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ERSCHEINUNGSBILD"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "APPEARANCE"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "APARIENCIA"
+          }
+        },
+        "fil" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "HITSURA"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "APPARENCE"
+          }
+        },
+        "he" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "מראה"
+          }
+        },
+        "hi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "दिखावट"
+          }
+        },
+        "id" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "TAMPILAN"
+          }
+        },
+        "it" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ASPETTO"
+          }
+        },
+        "ja" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "外観"
+          }
+        },
+        "ko" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "화면 모드"
+          }
+        },
+        "ms" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "PENAMPILAN"
+          }
+        },
+        "ne" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "रूप"
+          }
+        },
+        "nl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "WEERGAVE"
+          }
+        },
+        "pl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "WYGLĄD"
+          }
+        },
+        "pt" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "APARÊNCIA"
+          }
+        },
+        "pt-BR" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "APARÊNCIA"
+          }
+        },
+        "ru" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ОФОРМЛЕНИЕ"
+          }
+        },
+        "sv" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "UTSEENDE"
+          }
+        },
+        "ta" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "தோற்றம்"
+          }
+        },
+        "th" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ลักษณะที่ปรากฏ"
+          }
+        },
+        "tr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "GÖRÜNÜM"
+          }
+        },
+        "uk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ОФОРМЛЕННЯ"
+          }
+        },
+        "ur" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "ظاہری شکل"
+          }
+        },
+        "vi" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "GIAO DIỆN"
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "外观"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "外觀"
+          }
+        }
+      }
+    },
     "app_info.close" : {
       "extractionState" : "manual",
       "localizations" : {
@@ -24397,7 +24934,7 @@
         "en" : {
           "stringUnit" : {
             "state" : "translated",
-            "value" : "chat with people near you using geohash channels. only a coarse geohash is shared, never exact GPS. your IP address is hidden by routing all traffic over tor."
+            "value" : "chat with people near you using geohash channels. the selected geohash is public and may reveal an approximate area; exact GPS is never shared. your IP address is hidden by routing all traffic over tor."
           }
         },
         "es" : {

bitchat/Models/BitchatMessage+Media.swift

@@ -6,6 +6,7 @@
 // For more information, see <https://unlicense.org>
 //
 
+import BitFoundation
 import Foundation
 
 extension BitchatMessage {

bitchat/Models/RequestSyncPacket.swift

@@ -96,7 +96,7 @@ struct RequestSyncPacket {
             }
         }
 
-        guard let pp = p, let mm = m, let dd = payload, pp >= 1, mm > 0 else { return nil }
+        guard let pp = p, let mm = m, let dd = payload, pp >= 1, pp <= GCSFilter.maxP, mm > 0 else { return nil }
         return RequestSyncPacket(p: pp, m: mm, data: dd, types: types, sinceTimestamp: sinceTimestamp, fragmentIdFilter: fragmentIdFilter)
     }
 }

bitchat/Noise/NoiseProtocol.swift

@@ -322,6 +322,13 @@ final class NoiseCipherState {
                 throw NoiseError.replayDetected
             }
             
+            // The 4-byte nonce prefix has been stripped, so the remaining bytes
+            // must still hold at least the 16-byte Poly1305 tag. The up-front
+            // `ciphertext.count >= 16` guard is not sufficient here (it counts
+            // the nonce), and `prefix(count - 16)` would trap on a short payload.
+            guard actualCiphertext.count >= 16 else {
+                throw NoiseError.invalidCiphertext
+            }
             // Split ciphertext and tag
             encryptedData = actualCiphertext.prefix(actualCiphertext.count - 16)
             tag = actualCiphertext.suffix(16)
@@ -533,7 +540,7 @@ final class NoiseSymmetricState {
 final class NoiseHandshakeState {
     private let role: NoiseRole
     private let pattern: NoisePattern
-    private let keychain: SecureMemoryCleaner
+    private let keychain: KeychainManagerProtocol
     private var symmetricState: NoiseSymmetricState
     
     // Keys
@@ -556,7 +563,7 @@ final class NoiseHandshakeState {
     init(
         role: NoiseRole,
         pattern: NoisePattern,
-        keychain: SecureMemoryCleaner,
+        keychain: KeychainManagerProtocol,
         localStaticKey: Curve25519.KeyAgreement.PrivateKey? = nil,
         remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil,
         prologue: Data = Data(),
@@ -924,7 +931,7 @@ extension NoisePattern {
 
 // MARK: - Errors
 
-public enum NoiseError: Error {
+enum NoiseError: Error {
     case uninitializedCipher
     case invalidCiphertext
     case handshakeComplete

bitchat/Noise/NoiseRateLimiter.swift

@@ -10,7 +10,7 @@ import BitLogger
 import BitFoundation
 import Foundation
 
-public final class NoiseRateLimiter {
+final class NoiseRateLimiter {
     private var handshakeTimestamps: [PeerID: [Date]] = [:]
     private var messageTimestamps: [PeerID: [Date]] = [:]
     
@@ -19,10 +19,8 @@ public final class NoiseRateLimiter {
     private var globalMessageTimestamps: [Date] = []
     
     private let queue = DispatchQueue(label: "chat.bitchat.noise.ratelimit", attributes: .concurrent)
-
-    public init() {}
-
-    public func allowHandshake(from peerID: PeerID) -> Bool {
+    
+    func allowHandshake(from peerID: PeerID) -> Bool {
         return queue.sync(flags: .barrier) {
             let now = Date()
             let oneMinuteAgo = now.addingTimeInterval(-60)
@@ -51,7 +49,7 @@ public final class NoiseRateLimiter {
         }
     }
     
-    public func allowMessage(from peerID: PeerID) -> Bool {
+    func allowMessage(from peerID: PeerID) -> Bool {
         return queue.sync(flags: .barrier) {
             let now = Date()
             let oneSecondAgo = now.addingTimeInterval(-1)
@@ -87,7 +85,7 @@ public final class NoiseRateLimiter {
         }
     }
 
-    public func resetAll() {
+    func resetAll() {
         queue.async(flags: .barrier) {
             self.handshakeTimestamps.removeAll()
             self.messageTimestamps.removeAll()

bitchat/Noise/NoiseSecurityConstants.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-public enum NoiseSecurityConstants {
+enum NoiseSecurityConstants {
     // Maximum message size to prevent memory exhaustion
     static let maxMessageSize = 65535 // 64KB as per Noise spec
     
@@ -28,10 +28,10 @@ public enum NoiseSecurityConstants {
     static let maxSessionsPerPeer = 3
     
     // Rate limiting
-    public static let maxHandshakesPerMinute = 10
-    public static let maxMessagesPerSecond = 100
+    static let maxHandshakesPerMinute = 10
+    static let maxMessagesPerSecond = 100
     
     // Global rate limiting (across all peers)
-    public static let maxGlobalHandshakesPerMinute = 30
-    public static let maxGlobalMessagesPerSecond = 500
+    static let maxGlobalHandshakesPerMinute = 30
+    static let maxGlobalMessagesPerSecond = 500
 }

bitchat/Noise/NoiseSecurityError.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-public enum NoiseSecurityError: Error {
+enum NoiseSecurityError: Error {
     case sessionExpired
     case sessionExhausted
     case messageTooLarge

bitchat/Noise/NoiseSecurityValidator.swift

@@ -8,15 +8,15 @@
 
 import Foundation
 
-public struct NoiseSecurityValidator {
+struct NoiseSecurityValidator {
     
     /// Validate message size
-    public static func validateMessageSize(_ data: Data) -> Bool {
+    static func validateMessageSize(_ data: Data) -> Bool {
         return data.count <= NoiseSecurityConstants.maxMessageSize
     }
     
     /// Validate handshake message size
-    public static func validateHandshakeMessageSize(_ data: Data) -> Bool {
+    static func validateHandshakeMessageSize(_ data: Data) -> Bool {
         return data.count <= NoiseSecurityConstants.maxHandshakeMessageSize
     }
 }

bitchat/Noise/NoiseSession.swift

@@ -11,10 +11,10 @@ import Foundation
 import CryptoKit
 import BitFoundation
 
-public class NoiseSession {
+class NoiseSession {
     let peerID: PeerID
     let role: NoiseRole
-    private let keychain: SecureMemoryCleaner
+    private let keychain: KeychainManagerProtocol
     private var state: NoiseSessionState = .uninitialized
     private var handshakeState: NoiseHandshakeState?
     private var sendCipher: NoiseCipherState?
@@ -34,7 +34,7 @@ public class NoiseSession {
     init(
         peerID: PeerID,
         role: NoiseRole,
-        keychain: SecureMemoryCleaner,
+        keychain: KeychainManagerProtocol,
         localStaticKey: Curve25519.KeyAgreement.PrivateKey,
         remoteStaticKey: Curve25519.KeyAgreement.PublicKey? = nil
     ) {
@@ -182,7 +182,7 @@ public class NoiseSession {
         }
     }
     
-    public func isEstablished() -> Bool {
+    func isEstablished() -> Bool {
         return sessionQueue.sync {
             if case .established = state {
                 return true
@@ -217,8 +217,8 @@ public class NoiseSession {
             sentHandshakeMessages.removeAll()
             
             // Clear handshake hash
-            if handshakeHash != nil {
-                keychain.secureClear(&handshakeHash!)
+            if var hash = handshakeHash {
+                keychain.secureClear(&hash)
             }
             handshakeHash = nil
             

bitchat/Noise/NoiseSessionError.swift

@@ -6,7 +6,7 @@
 // For more information, see <https://unlicense.org>
 //
 
-public enum NoiseSessionError: Error, Equatable {
+enum NoiseSessionError: Error, Equatable {
     case invalidState
     case notEstablished
     case sessionNotFound

bitchat/Noise/NoiseSessionManager.swift

@@ -11,18 +11,18 @@ import CryptoKit
 import Foundation
 import BitFoundation
 
-public final class NoiseSessionManager {
+final class NoiseSessionManager {
     private var sessions: [PeerID: NoiseSession] = [:]
     private let localStaticKey: Curve25519.KeyAgreement.PrivateKey
-    private let keychain: SecureMemoryCleaner
+    private let keychain: KeychainManagerProtocol
     private let sessionFactory: (PeerID, NoiseRole) -> NoiseSession
     private let managerQueue = DispatchQueue(label: "chat.bitchat.noise.manager", attributes: .concurrent)
     
     // Callbacks
-    public var onSessionEstablished: ((PeerID, Curve25519.KeyAgreement.PublicKey) -> Void)?
+    var onSessionEstablished: ((PeerID, Curve25519.KeyAgreement.PublicKey) -> Void)?
     var onSessionFailed: ((PeerID, Error) -> Void)?
     
-    public init(localStaticKey: Curve25519.KeyAgreement.PrivateKey, keychain: SecureMemoryCleaner) {
+    init(localStaticKey: Curve25519.KeyAgreement.PrivateKey, keychain: KeychainManagerProtocol) {
         self.localStaticKey = localStaticKey
         self.keychain = keychain
         self.sessionFactory = { peerID, role in
@@ -38,7 +38,7 @@ public final class NoiseSessionManager {
     #if DEBUG
     init(
         localStaticKey: Curve25519.KeyAgreement.PrivateKey,
-        keychain: SecureMemoryCleaner,
+        keychain: KeychainManagerProtocol,
         sessionFactory: @escaping (PeerID, NoiseRole) -> NoiseSession
     ) {
         self.localStaticKey = localStaticKey
@@ -49,13 +49,13 @@ public final class NoiseSessionManager {
     
     // MARK: - Session Management
     
-    public func getSession(for peerID: PeerID) -> NoiseSession? {
+    func getSession(for peerID: PeerID) -> NoiseSession? {
         return managerQueue.sync {
             return sessions[peerID]
         }
     }
     
-    public func removeSession(for peerID: PeerID) {
+    func removeSession(for peerID: PeerID) {
         managerQueue.sync(flags: .barrier) {
             if let session = sessions.removeValue(forKey: peerID) {
                 session.reset() // Clear sensitive data before removing
@@ -63,7 +63,7 @@ public final class NoiseSessionManager {
         }
     }
 
-    public func removeAllSessions() {
+    func removeAllSessions() {
         managerQueue.sync(flags: .barrier) {
             for (_, session) in sessions {
                 session.reset()
@@ -74,7 +74,7 @@ public final class NoiseSessionManager {
     
     // MARK: - Handshake Helpers
     
-    public func initiateHandshake(with peerID: PeerID) throws -> Data {
+    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() {
@@ -103,7 +103,7 @@ public final class NoiseSessionManager {
         }
     }
     
-    public func handleIncomingHandshake(from peerID: PeerID, message: Data) throws -> Data? {
+    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
@@ -173,7 +173,7 @@ public final class NoiseSessionManager {
     
     // MARK: - Encryption/Decryption
     
-    public func encrypt(_ plaintext: Data, for peerID: PeerID) throws -> Data {
+    func encrypt(_ plaintext: Data, for peerID: PeerID) throws -> Data {
         guard let session = getSession(for: peerID) else {
             throw NoiseSessionError.sessionNotFound
         }
@@ -181,7 +181,7 @@ public final class NoiseSessionManager {
         return try session.encrypt(plaintext)
     }
     
-    public func decrypt(_ ciphertext: Data, from peerID: PeerID) throws -> Data {
+    func decrypt(_ ciphertext: Data, from peerID: PeerID) throws -> Data {
         guard let session = getSession(for: peerID) else {
             throw NoiseSessionError.sessionNotFound
         }
@@ -191,13 +191,13 @@ public final class NoiseSessionManager {
     
     // MARK: - Key Management
     
-    public func getRemoteStaticKey(for peerID: PeerID) -> Curve25519.KeyAgreement.PublicKey? {
+    func getRemoteStaticKey(for peerID: PeerID) -> Curve25519.KeyAgreement.PublicKey? {
         return getSession(for: peerID)?.getRemoteStaticPublicKey()
     }
     
     // MARK: - Session Rekeying
     
-    public func getSessionsNeedingRekey() -> [(peerID: PeerID, needsRekey: Bool)] {
+    func getSessionsNeedingRekey() -> [(peerID: PeerID, needsRekey: Bool)] {
         return managerQueue.sync {
             var needingRekey: [(peerID: PeerID, needsRekey: Bool)] = []
             
@@ -213,7 +213,7 @@ public final class NoiseSessionManager {
         }
     }
     
-    public func initiateRekey(for peerID: PeerID) throws {
+    func initiateRekey(for peerID: PeerID) throws {
         // Remove old session
         removeSession(for: peerID)
         

bitchat/Nostr/Base64URLCoding.swift

@@ -0,0 +1,22 @@
+import Foundation
+
+enum Base64URLCoding {
+    static func encode(_ data: Data) -> String {
+        data.base64EncodedString()
+            .replacingOccurrences(of: "+", with: "-")
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "=", with: "")
+    }
+
+    static func decode(_ string: String) -> Data? {
+        var base64 = string
+        let padding = (4 - (base64.count % 4)) % 4
+        if padding > 0 {
+            base64 += String(repeating: "=", count: padding)
+        }
+        base64 = base64
+            .replacingOccurrences(of: "-", with: "+")
+            .replacingOccurrences(of: "_", with: "/")
+        return Data(base64Encoded: base64)
+    }
+}

bitchat/Nostr/Bech32.swift

@@ -1,37 +1,38 @@
 import Foundation
 
 /// Bech32 encoding for Nostr (minimal implementation)
-public enum Bech32 {
+enum Bech32 {
     private static let charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
     private static let generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
-
-    public static func encode(hrp: String, data: Data) throws -> String {
+    
+    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 {
+        
+        return hrp + "1" + combined.map { 
             let index = charset.index(charset.startIndex, offsetBy: Int($0))
             return String(charset[index])
         }.joined()
     }
-
-    public static func decode(_ bech32String: String) throws -> (hrp: String, data: Data) {
+    
+    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 {
@@ -40,84 +41,84 @@ public enum Bech32 {
             }
             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 [] // 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 [] // 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 {

bitchat/Nostr/GeoRelayDirectory.swift

@@ -1,72 +1,106 @@
 import BitLogger
 import Foundation
+import Tor
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
 
-public struct GeoRelayDirectoryDependencies {
-    public var userDefaults: UserDefaults
-    public var notificationCenter: NotificationCenter
-    public var now: () -> Date
-    public var remoteURL: URL
-    public var fetchInterval: TimeInterval
-    public var refreshCheckInterval: TimeInterval
-    public var retryInitialSeconds: TimeInterval
-    public var retryMaxSeconds: TimeInterval
-    public var awaitTorReady: @Sendable () async -> Bool
-    public var makeFetchData: @MainActor @Sendable () -> (@Sendable (URLRequest) async throws -> Data)
-    public var readData: (URL) -> Data?
-    public var writeData: (Data, URL) throws -> Void
-    public var cacheURL: () -> URL?
-    public var bundledCSVURLs: () -> [URL]
-    public var currentDirectoryPath: () -> String?
-    public var retrySleep: (TimeInterval) async -> Void
-    public var torReadyNotificationName: Notification.Name?
-    public var activeNotificationName: Notification.Name?
-    public var autoStart: Bool
+extension Notification.Name {
+    /// Posted after the geo relay directory successfully refreshes its entries.
+    static let geoRelayDirectoryDidRefresh = Notification.Name("bitchat.geoRelayDirectoryDidRefresh")
+}
 
-    public init(
-        userDefaults: UserDefaults,
-        notificationCenter: NotificationCenter,
-        now: @escaping () -> Date,
-        remoteURL: URL,
-        fetchInterval: TimeInterval,
-        refreshCheckInterval: TimeInterval,
-        retryInitialSeconds: TimeInterval,
-        retryMaxSeconds: TimeInterval,
-        awaitTorReady: @Sendable @escaping () async -> Bool,
-        makeFetchData: @MainActor @Sendable @escaping () -> (@Sendable (URLRequest) async throws -> Data),
-        readData: @escaping (URL) -> Data?,
-        writeData: @escaping (Data, URL) throws -> Void,
-        cacheURL: @escaping () -> URL?,
-        bundledCSVURLs: @escaping () -> [URL],
-        currentDirectoryPath: @escaping () -> String?,
-        retrySleep: @escaping (TimeInterval) async -> Void,
-        torReadyNotificationName: Notification.Name?,
-        activeNotificationName: Notification.Name?,
-        autoStart: Bool
-    ) {
-        self.userDefaults = userDefaults
-        self.notificationCenter = notificationCenter
-        self.now = now
-        self.remoteURL = remoteURL
-        self.fetchInterval = fetchInterval
-        self.refreshCheckInterval = refreshCheckInterval
-        self.retryInitialSeconds = retryInitialSeconds
-        self.retryMaxSeconds = retryMaxSeconds
-        self.awaitTorReady = awaitTorReady
-        self.makeFetchData = makeFetchData
-        self.readData = readData
-        self.writeData = writeData
-        self.cacheURL = cacheURL
-        self.bundledCSVURLs = bundledCSVURLs
-        self.currentDirectoryPath = currentDirectoryPath
-        self.retrySleep = retrySleep
-        self.torReadyNotificationName = torReadyNotificationName
-        self.activeNotificationName = activeNotificationName
-        self.autoStart = autoStart
+/// Directory of online Nostr relays with approximate GPS locations, used for geohash routing.
+struct GeoRelayDirectoryDependencies {
+    var userDefaults: UserDefaults
+    var notificationCenter: NotificationCenter
+    var now: () -> Date
+    var remoteURL: URL
+    var fetchInterval: TimeInterval
+    var refreshCheckInterval: TimeInterval
+    var retryInitialSeconds: TimeInterval
+    var retryMaxSeconds: TimeInterval
+    var awaitTorReady: @Sendable () async -> Bool
+    var makeFetchData: @MainActor @Sendable () -> (@Sendable (URLRequest) async throws -> Data)
+    var readData: (URL) -> Data?
+    var writeData: (Data, URL) throws -> Void
+    var cacheURL: () -> URL?
+    var bundledCSVURLs: () -> [URL]
+    var currentDirectoryPath: () -> String?
+    var retrySleep: (TimeInterval) async -> Void
+    var activeNotificationName: Notification.Name?
+    var autoStart: Bool
+}
+
+private extension GeoRelayDirectoryDependencies {
+    @MainActor
+    static func live() -> Self {
+#if os(iOS)
+        let activeNotificationName: Notification.Name? = UIApplication.didBecomeActiveNotification
+#elseif os(macOS)
+        let activeNotificationName: Notification.Name? = NSApplication.didBecomeActiveNotification
+#else
+        let activeNotificationName: Notification.Name? = nil
+#endif
+
+        return Self(
+            userDefaults: .standard,
+            notificationCenter: .default,
+            now: Date.init,
+            remoteURL: URL(string: "https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv")!,
+            fetchInterval: TransportConfig.geoRelayFetchIntervalSeconds,
+            refreshCheckInterval: TransportConfig.geoRelayRefreshCheckIntervalSeconds,
+            retryInitialSeconds: TransportConfig.geoRelayRetryInitialSeconds,
+            retryMaxSeconds: TransportConfig.geoRelayRetryMaxSeconds,
+            awaitTorReady: { await TorManager.shared.awaitEgressReady() },
+            makeFetchData: {
+                let session = TorURLSession.shared.session
+                return { request in
+                    let (data, _) = try await session.data(for: request)
+                    return data
+                }
+            },
+            readData: { try? Data(contentsOf: $0) },
+            writeData: { data, url in
+                try data.write(to: url, options: .atomic)
+            },
+            cacheURL: {
+                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("georelays_cache.csv")
+                } catch {
+                    return nil
+                }
+            },
+            bundledCSVURLs: {
+                [
+                    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 }
+            },
+            currentDirectoryPath: { FileManager.default.currentDirectoryPath },
+            retrySleep: { delay in
+                let nanoseconds = UInt64(delay * 1_000_000_000)
+                try? await Task.sleep(nanoseconds: nanoseconds)
+            },
+            activeNotificationName: activeNotificationName,
+            autoStart: true
+        )
     }
 }
 
 @MainActor
-public final class GeoRelayDirectory {
+final class GeoRelayDirectory {
     private final class CleanupState {
         let notificationCenter: NotificationCenter
         var observers: [NSObjectProtocol] = []
@@ -84,16 +118,10 @@ public final class GeoRelayDirectory {
         }
     }
 
-    public struct Entry: Hashable, Sendable {
-        public let host: String
-        public let lat: Double
-        public let lon: Double
-
-        public init(host: String, lat: Double, lon: Double) {
-            self.host = host
-            self.lat = lat
-            self.lon = lon
-        }
+    struct Entry: Hashable, Sendable {
+        let host: String
+        let lat: Double
+        let lon: Double
     }
 
     private enum DetachedFetchOutcome: Sendable {
@@ -103,13 +131,9 @@ public final class GeoRelayDirectory {
         case network(String)
     }
 
-    nonisolated(unsafe) public static var shared: GeoRelayDirectory!
+    static let shared = GeoRelayDirectory()
 
-    public static func setupShared(dependencies: GeoRelayDirectoryDependencies) {
-        shared = GeoRelayDirectory(dependencies: dependencies)
-    }
-
-    private(set) public var entries: [Entry] = []
+    private(set) var entries: [Entry] = []
     private let lastFetchKey = "georelay.lastFetchAt"
     private let dependencies: GeoRelayDirectoryDependencies
     private let cleanupState: CleanupState
@@ -117,7 +141,18 @@ public final class GeoRelayDirectory {
     private var retryAttempt: Int = 0
     private var isFetching: Bool = false
 
-    public init(dependencies: GeoRelayDirectoryDependencies) {
+    private init() {
+        self.dependencies = .live()
+        self.cleanupState = CleanupState(notificationCenter: dependencies.notificationCenter)
+        entries = loadLocalEntries()
+        if dependencies.autoStart {
+            registerObservers()
+            startRefreshTimer()
+            prefetchIfNeeded()
+        }
+    }
+
+    internal init(dependencies: GeoRelayDirectoryDependencies) {
         self.dependencies = dependencies
         self.cleanupState = CleanupState(notificationCenter: dependencies.notificationCenter)
         entries = loadLocalEntries()
@@ -129,43 +164,26 @@ public final class GeoRelayDirectory {
     }
 
     /// Returns up to `count` relay URLs (wss://) closest to the geohash center.
-    public func closestRelays(toGeohash geohash: String, count: Int = 5) -> [String] {
-        let center = decodeGeohashCenter(geohash)
+    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.
-    public func closestRelays(toLat lat: Double, lon: Double, count: Int = 5) -> [String] {
+    /// Ties break by host so every device with the same directory picks the
+    /// same relay set — publishers and subscribers must agree on relays.
+    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)" }
+        return entries
+            .map { (entry: $0, distance: haversineKm(lat, lon, $0.lat, $0.lon)) }
+            .sorted { ($0.distance, $0.entry.host) < ($1.distance, $1.entry.host) }
+            .prefix(count)
+            .map { "wss://\($0.entry.host)" }
     }
 
     // MARK: - Remote Fetch
-    public func prefetchIfNeeded(force: Bool = false) {
+    func prefetchIfNeeded(force: Bool = false) {
         guard !isFetching else { return }
 
         let now = dependencies.now()
@@ -175,6 +193,7 @@ public final class GeoRelayDirectory {
             guard now.timeIntervalSince(last) >= dependencies.fetchInterval else { return }
         } else if last != .distantPast,
                   now.timeIntervalSince(last) < dependencies.retryInitialSeconds {
+            // Skip forced fetches if we just refreshed moments ago.
             return
         }
 
@@ -258,6 +277,8 @@ public final class GeoRelayDirectory {
         isFetching = false
         retryAttempt = 0
         cancelRetry()
+        // Let waiters (e.g. location notes stuck in a "no relays" state) retry.
+        dependencies.notificationCenter.post(name: .geoRelayDirectoryDidRefresh, object: nil)
     }
 
     @MainActor
@@ -312,6 +333,7 @@ public final class GeoRelayDirectory {
 
     // MARK: - Loading
     private func loadLocalEntries() -> [Entry] {
+        // Prefer cached file if present
         if let cache = dependencies.cacheURL(),
            let data = dependencies.readData(cache),
            let text = String(data: data, encoding: .utf8) {
@@ -319,6 +341,7 @@ public final class GeoRelayDirectory {
             if !arr.isEmpty { return arr }
         }
 
+        // Try bundled resource(s)
         let bundleCandidates = dependencies.bundledCSVURLs()
 
         for url in bundleCandidates {
@@ -329,6 +352,7 @@ public final class GeoRelayDirectory {
             }
         }
 
+        // Try filesystem path (development/test)
         if let cwd = dependencies.currentDirectoryPath(),
            let data = dependencies.readData(URL(fileURLWithPath: cwd).appendingPathComponent("relays/online_relays_gps.csv")),
            let text = String(data: data, encoding: .utf8) {
@@ -339,7 +363,7 @@ public final class GeoRelayDirectory {
         return []
     }
 
-    nonisolated public static func parseCSV(_ text: String) -> [Entry] {
+    nonisolated static func parseCSV(_ text: String) -> [Entry] {
         var result: Set<Entry> = []
         let lines = text.split(whereSeparator: { $0.isNewline })
         for (idx, raw) in lines.enumerated() {
@@ -347,12 +371,7 @@ public final class GeoRelayDirectory {
             if idx == 0 && line.lowercased().contains("relay url") { continue }
             let parts = line.split(separator: ",").map { $0.trimmed }
             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 host = NostrRelayURL.directoryAddress(parts[0]) else { continue }
             guard let lat = Double(parts[1]), let lon = Double(parts[2]) else { continue }
             result.insert(Entry(host: host, lat: lat, lon: lon))
         }
@@ -363,19 +382,17 @@ public final class GeoRelayDirectory {
     private func registerObservers() {
         let center = dependencies.notificationCenter
 
-        if let torReadyName = dependencies.torReadyNotificationName {
-            let torReady = center.addObserver(
-                forName: torReadyName,
-                object: nil,
-                queue: .main
-            ) { [weak self] _ in
-                guard let self else { return }
-                Task { @MainActor in
-                    self.prefetchIfNeeded(force: true)
-                }
+        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)
             }
-            cleanupState.observers.append(torReady)
         }
+        cleanupState.observers.append(torReady)
 
         if let activeNotificationName = dependencies.activeNotificationName {
             let didBecomeActive = center.addObserver(
@@ -407,49 +424,17 @@ public final class GeoRelayDirectory {
         RunLoop.main.add(timer, forMode: .common)
     }
 
-    public var debugRetryAttempt: Int { retryAttempt }
-    public var debugHasRetryTask: Bool { cleanupState.retryTask != nil }
-    public var debugObserverCount: Int { cleanupState.observers.count }
+    var debugRetryAttempt: Int { retryAttempt }
+    var debugHasRetryTask: Bool { cleanupState.retryTask != nil }
+    var debugObserverCount: Int { cleanupState.observers.count }
 }
 
 // MARK: - Distance
 private func haversineKm(_ lat1: Double, _ lon1: Double, _ lat2: Double, _ lon2: Double) -> Double {
-    let r = 6371.0
+    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
 }
-
-// MARK: - Geohash decode (inline to avoid external dependency)
-
-private let geohashBase32Map: [Character: Int] = {
-    let chars = Array("0123456789bcdefghjkmnpqrstuvwxyz")
-    var map: [Character: Int] = [:]
-    for (i, c) in chars.enumerated() { map[c] = i }
-    return map
-}()
-
-private func decodeGeohashCenter(_ 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 = geohashBase32Map[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)
-}

bitchat/Nostr/NostrIdentity.swift

@@ -2,56 +2,59 @@ import Foundation
 import P256K
 
 /// Manages Nostr identity (secp256k1 keypair) for NIP-17 private messaging
-public struct NostrIdentity: Codable, Sendable {
-    public let privateKey: Data
-    public let publicKey: Data
-    public let npub: String // Bech32-encoded public key
-    public let createdAt: Date
-
-    public init(privateKey: Data, publicKey: Data, npub: String, createdAt: Date) {
+struct NostrIdentity: Codable {
+    let privateKey: Data
+    let publicKey: Data
+    let npub: String // Bech32-encoded public key
+    let createdAt: Date
+    
+    /// Memberwise initializer
+    init(privateKey: Data, publicKey: Data, npub: String, createdAt: Date) {
         self.privateKey = privateKey
         self.publicKey = publicKey
         self.npub = npub
         self.createdAt = createdAt
     }
-
+    
     /// Generate a new Nostr identity
-    public static func generate() throws -> NostrIdentity {
+    static func generate() throws -> NostrIdentity {
+        // Generate Schnorr key for Nostr
         let schnorrKey = try P256K.Schnorr.PrivateKey()
         let xOnlyPubkey = Data(schnorrKey.xonly.bytes)
         let npub = try Bech32.encode(hrp: "npub", data: xOnlyPubkey)
-
+        
         return NostrIdentity(
             privateKey: schnorrKey.dataRepresentation,
-            publicKey: xOnlyPubkey,
+            publicKey: xOnlyPubkey, // Store x-only public key
             npub: npub,
             createdAt: Date()
         )
     }
-
+    
     /// Initialize from existing private key data
-    public init(privateKeyData: Data) throws {
+    init(privateKeyData: Data) throws {
         let schnorrKey = try P256K.Schnorr.PrivateKey(dataRepresentation: privateKeyData)
         let xOnlyPubkey = Data(schnorrKey.xonly.bytes)
-
+        
         self.privateKey = privateKeyData
         self.publicKey = xOnlyPubkey
         self.npub = try Bech32.encode(hrp: "npub", data: xOnlyPubkey)
         self.createdAt = Date()
     }
-
+    
     /// Get signing key for event signatures
-    public func signingKey() throws -> P256K.Signing.PrivateKey {
+    func signingKey() throws -> P256K.Signing.PrivateKey {
         try P256K.Signing.PrivateKey(dataRepresentation: privateKey)
     }
-
+    
     /// Get Schnorr signing key for Nostr event signatures
-    public func schnorrSigningKey() throws -> P256K.Schnorr.PrivateKey {
+    func schnorrSigningKey() throws -> P256K.Schnorr.PrivateKey {
         try P256K.Schnorr.PrivateKey(dataRepresentation: privateKey)
     }
-
+    
     /// Get hex-encoded public key (for Nostr events)
-    public var publicKeyHex: String {
-        publicKey.hexEncodedString()
+    var publicKeyHex: String {
+        // Public key is already stored as x-only (32 bytes)
+        return publicKey.hexEncodedString()
     }
 }

bitchat/Nostr/NostrIdentityBridge.swift

@@ -1,54 +1,52 @@
+import BitFoundation
 import Foundation
 import CryptoKit
 
-/// Minimal keychain access required by NostrIdentityBridge.
-public protocol NostrKeychainStoring: Sendable {
-    func save(key: String, data: Data, service: String, accessible: CFString?)
-    func load(key: String, service: String) -> Data?
-}
-
 /// Bridge between Noise and Nostr identities
-public final class NostrIdentityBridge {
+final class NostrIdentityBridge {
     private let keychainService = "chat.bitchat.nostr"
     private let currentIdentityKey = "nostr-current-identity"
     private let deviceSeedKey = "nostr-device-seed"
-    private let deviceSeedCache: NSLock = NSLock()
-    private var _deviceSeedCacheValue: Data?
+    // 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 var derivedIdentityCache: [String: NostrIdentity] = [:]
     private let cacheLock = NSLock()
 
-    private let keychain: any NostrKeychainStoring
+    private let keychain: KeychainManagerProtocol
 
-    public init(keychain: any NostrKeychainStoring) {
+    init(keychain: KeychainManagerProtocol = KeychainManager()) {
         self.keychain = keychain
     }
-
+    
     /// Get or create the current Nostr identity
-    public func getCurrentNostrIdentity() throws -> NostrIdentity? {
+    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)
-    public func associateNostrIdentity(_ nostrPubkey: String, with noisePublicKey: Data) {
+    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
-    public func getNostrPublicKey(for noisePublicKey: Data) -> String? {
+    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 {
@@ -56,9 +54,9 @@ public final class NostrIdentityBridge {
         }
         return pubkey
     }
-
+    
     /// Clear all Nostr identity associations and current identity
-    public func clearAllAssociations() {
+    func clearAllAssociations() {
         let query: [String: Any] = [
             kSecClass as String: kSecClassGenericPassword,
             kSecAttrService as String: keychainService,
@@ -79,45 +77,49 @@ public final class NostrIdentityBridge {
                 }
                 SecItemDelete(deleteQuery as CFDictionary)
             }
+        } else if status == errSecItemNotFound {
+            // nothing persisted; no action needed
         }
 
-        deviceSeedCache.lock()
-        _deviceSeedCacheValue = nil
-        deviceSeedCache.unlock()
+        deviceSeedCache = nil
+        // Also drop the in-memory derived per-geohash identities. These hold the
+        // actual secp256k1 private keys; if left cached, post-panic geohash
+        // messages would still be signed with pre-panic keys (linkable across the
+        // wipe) until the app is force-quit.
+        cacheLock.lock()
+        derivedIdentityCache.removeAll()
+        cacheLock.unlock()
     }
 
     // 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 {
-        deviceSeedCache.lock()
-        if let cached = _deviceSeedCacheValue {
-            deviceSeedCache.unlock()
-            return cached
-        }
-        deviceSeedCache.unlock()
-
+        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.lock()
-            _deviceSeedCacheValue = existing
-            deviceSeedCache.unlock()
+            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.lock()
-        _deviceSeedCacheValue = seed
-        deviceSeedCache.unlock()
+        deviceSeedCache = seed
         return seed
     }
 
     /// Derive a deterministic, unlinkable Nostr identity for a given geohash.
-    public func deriveIdentity(forGeohash geohash: String) throws -> NostrIdentity {
+    /// 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] {
+        if let cached = derivedIdentityCache[geohash] {
             cacheLock.unlock()
             return cached
         }
@@ -138,21 +140,24 @@ public final class NostrIdentityBridge {
             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
+                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
+        derivedIdentityCache[geohash] = identity
         cacheLock.unlock()
 
         return identity

bitchat/Nostr/NostrLiveFactories.swift

@@ -1,118 +0,0 @@
-import Nostr
-import Combine
-import Foundation
-import Tor
-#if os(iOS)
-import UIKit
-#elseif os(macOS)
-import AppKit
-#endif
-
-// MARK: - GeoRelayDirectory Live Dependencies
-
-extension GeoRelayDirectoryDependencies {
-    @MainActor
-    static func live() -> Self {
-        #if os(iOS)
-        let activeNotificationName: Notification.Name? = UIApplication.didBecomeActiveNotification
-        #elseif os(macOS)
-        let activeNotificationName: Notification.Name? = NSApplication.didBecomeActiveNotification
-        #else
-        let activeNotificationName: Notification.Name? = nil
-        #endif
-
-        return Self(
-            userDefaults: .standard,
-            notificationCenter: .default,
-            now: Date.init,
-            remoteURL: URL(string: "https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv")!,
-            fetchInterval: TransportConfig.geoRelayFetchIntervalSeconds,
-            refreshCheckInterval: TransportConfig.geoRelayRefreshCheckIntervalSeconds,
-            retryInitialSeconds: TransportConfig.geoRelayRetryInitialSeconds,
-            retryMaxSeconds: TransportConfig.geoRelayRetryMaxSeconds,
-            awaitTorReady: { await TorManager.shared.awaitReady() },
-            makeFetchData: {
-                let session = TorURLSession.shared.session
-                return { request in
-                    let (data, _) = try await session.data(for: request)
-                    return data
-                }
-            },
-            readData: { try? Data(contentsOf: $0) },
-            writeData: { data, url in
-                try data.write(to: url, options: .atomic)
-            },
-            cacheURL: {
-                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("georelays_cache.csv")
-                } catch {
-                    return nil
-                }
-            },
-            bundledCSVURLs: {
-                [
-                    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 { $0 }
-            },
-            currentDirectoryPath: { FileManager.default.currentDirectoryPath },
-            retrySleep: { delay in
-                let nanoseconds = UInt64(delay * 1_000_000_000)
-                try? await Task.sleep(nanoseconds: nanoseconds)
-            },
-            torReadyNotificationName: .TorDidBecomeReady,
-            activeNotificationName: activeNotificationName,
-            autoStart: true
-        )
-    }
-}
-
-// MARK: - NostrRelayManager Live Dependencies
-
-extension NostrRelayManagerDependencies {
-    @MainActor
-    static func live() -> Self {
-        Self(
-            activationAllowed: { NetworkActivationService.shared.activationAllowed },
-            userTorEnabled: { NetworkActivationService.shared.userTorEnabled },
-            hasMutualFavorites: { !FavoritesPersistenceService.shared.mutualFavorites.isEmpty },
-            hasLocationPermission: { LocationChannelManager.shared.permissionState == .authorized },
-            mutualFavoritesPublisher: FavoritesPersistenceService.shared.$mutualFavorites.eraseToAnyPublisher(),
-            locationPermissionPublisher: LocationChannelManager.shared.$permissionState
-                .map { state -> LocationPermissionState in
-                    switch state {
-                    case .notDetermined:.notDetermined
-                    case .authorized:   .authorized
-                    case .denied:       .denied
-                    case .restricted:   .denied
-                    }
-                }
-                .eraseToAnyPublisher(),
-            torEnforced: { TorManager.shared.torEnforced },
-            torIsReady: { TorManager.shared.isReady },
-            torIsForeground: { TorManager.shared.isForeground() },
-            awaitTorReady: { completion in
-                Task.detached {
-                    let ready = await TorManager.shared.awaitReady()
-                    await MainActor.run {
-                        completion(ready)
-                    }
-                }
-            },
-            makeSession: { NostrRelayManager.makeURLSession(TorURLSession.shared.session) },
-            scheduleAfter: { delay, action in
-                DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: action)
-            },
-            now: Date.init
-        )
-    }
-}

bitchat/Nostr/NostrProtocol.swift

@@ -1,15 +1,17 @@
-import BitFoundation
 import BitLogger
 import Foundation
 import CryptoKit
 import P256K
 import Security
 
-/// NIP-17 Protocol Implementation for Private Direct Messages
-public struct NostrProtocol {
+// Note: This file depends on Data extension from BinaryEncodingUtils.swift
+// Make sure BinaryEncodingUtils.swift is included in the target
 
+/// NIP-17 Protocol Implementation for Private Direct Messages
+struct NostrProtocol {
+    
     /// Nostr event kinds
-    public enum EventKind: Int, Sendable {
+    enum EventKind: Int {
         case metadata = 0
         case textNote = 1
         case dm = 14 // NIP-17 DM rumor kind
@@ -18,9 +20,106 @@ public struct NostrProtocol {
         case ephemeralEvent = 20000
         case geohashPresence = 20001
     }
-
+    
     /// Create a NIP-17 private message
-    public static func createPrivateMessage(
+    static func createPrivateMessage(
+        content: String,
+        recipientPubkey: String,
+        senderIdentity: NostrIdentity
+    ) throws -> NostrEvent {
+        
+        // Creating private message
+        
+        // 1. Create the rumor (unsigned event)
+        let rumor = NostrEvent(
+            pubkey: senderIdentity.publicKeyHex,
+            createdAt: Date(),
+            kind: .dm, // NIP-17: DM rumor kind 14
+            tags: [],
+            content: content
+        )
+        
+        // 2. Seal the rumor (encrypt to recipient) and sign it with the SENDER'S
+        //    real identity key. NIP-17 requires the seal be signed by the sender
+        //    so the recipient can authenticate who sent the message; signing with
+        //    a throwaway key leaves DMs forgeable/impersonatable.
+        let senderKey = try senderIdentity.schnorrSigningKey()
+        let sealedEvent = try createSeal(
+            rumor: rumor,
+            recipientPubkey: recipientPubkey,
+            senderKey: senderKey
+        )
+
+        // 3. Gift wrap the sealed event with a throwaway ephemeral key (the wrap
+        //    layer hides the sender's identity from relays; createGiftWrap mints
+        //    its own ephemeral key internally).
+        let giftWrap = try createGiftWrap(
+            seal: sealedEvent,
+            recipientPubkey: recipientPubkey
+        )
+        
+        // Created gift wrap
+        
+        return giftWrap
+    }
+    
+    /// 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, timestamp: Int) {
+        
+        // Starting decryption
+        
+        // 1. Unwrap the gift wrap
+        let seal: NostrEvent
+        do {
+            seal = try unwrapGiftWrap(
+                giftWrap: giftWrap,
+                recipientKey: recipientIdentity.schnorrSigningKey()
+            )
+            // Successfully unwrapped gift wrap
+        } catch {
+            SecureLogger.error("❌ Failed to unwrap gift wrap: \(error)", category: .session)
+            throw error
+        }
+        
+        // 2. Authenticate the seal. The seal MUST be signed by the sender's real
+        //    identity key (NIP-17); without this check a DM is forgeable by anyone
+        //    who knows the recipient's npub. Verify the seal's own signature.
+        guard seal.isValidSignature() else {
+            SecureLogger.error("❌ Rejecting DM: seal signature is missing or invalid", category: .session)
+            throw NostrError.invalidEvent
+        }
+
+        // 3. Open the seal
+        let rumor: NostrEvent
+        do {
+            rumor = try openSeal(
+                seal: seal,
+                recipientKey: recipientIdentity.schnorrSigningKey()
+            )
+            // Successfully opened seal
+        } catch {
+            SecureLogger.error("❌ Failed to open seal: \(error)", category: .session)
+            throw error
+        }
+
+        // 4. The sender claimed inside the rumor must match the key that actually
+        //    signed the seal, otherwise the sender field is unauthenticated and
+        //    spoofable.
+        guard seal.pubkey == rumor.pubkey else {
+            SecureLogger.error("❌ Rejecting DM: rumor pubkey does not match seal signer", category: .session)
+            throw NostrError.invalidEvent
+        }
+
+        // Return the seal signer's pubkey as the authenticated sender.
+        return (content: rumor.content, senderPubkey: seal.pubkey, timestamp: rumor.created_at)
+    }
+
+    #if DEBUG
+    static func createPrivateMessageWithInvalidSealSignatureForTesting(
         content: String,
         recipientPubkey: String,
         senderIdentity: NostrIdentity
@@ -32,57 +131,39 @@ public struct NostrProtocol {
             tags: [],
             content: content
         )
-
-        let ephemeralKey = try P256K.Schnorr.PrivateKey()
-
-        let sealedEvent = try createSeal(
+        var seal = try createSeal(
             rumor: rumor,
             recipientPubkey: recipientPubkey,
-            senderKey: ephemeralKey
+            senderKey: senderIdentity.schnorrSigningKey()
         )
+        seal.sig = String(repeating: "0", count: 128)
+        return try createGiftWrap(seal: seal, recipientPubkey: recipientPubkey)
+    }
 
-        let giftWrap = try createGiftWrap(
-            seal: sealedEvent,
+    static func createPrivateMessageWithMismatchedSealRumorPubkeyForTesting(
+        content: String,
+        recipientPubkey: String,
+        rumorIdentity: NostrIdentity,
+        sealSignerIdentity: NostrIdentity
+    ) throws -> NostrEvent {
+        let rumor = NostrEvent(
+            pubkey: rumorIdentity.publicKeyHex,
+            createdAt: Date(),
+            kind: .dm,
+            tags: [],
+            content: content
+        )
+        let seal = try createSeal(
+            rumor: rumor,
             recipientPubkey: recipientPubkey,
-            senderKey: ephemeralKey
+            senderKey: sealSignerIdentity.schnorrSigningKey()
         )
-
-        return giftWrap
-    }
-
-    /// Decrypt a received NIP-17 message
-    /// Returns the content, sender pubkey, and the actual message timestamp (not the randomized gift wrap timestamp)
-    public static func decryptPrivateMessage(
-        giftWrap: NostrEvent,
-        recipientIdentity: NostrIdentity
-    ) throws -> (content: String, senderPubkey: String, timestamp: Int) {
-        let seal: NostrEvent
-        do {
-            seal = try unwrapGiftWrap(
-                giftWrap: giftWrap,
-                recipientKey: recipientIdentity.schnorrSigningKey()
-            )
-        } catch {
-            SecureLogger.error("❌ Failed to unwrap gift wrap: \(error)", category: .session)
-            throw error
-        }
-
-        let rumor: NostrEvent
-        do {
-            rumor = try openSeal(
-                seal: seal,
-                recipientKey: recipientIdentity.schnorrSigningKey()
-            )
-        } catch {
-            SecureLogger.error("❌ Failed to open seal: \(error)", category: .session)
-            throw error
-        }
-
-        return (content: rumor.content, senderPubkey: rumor.pubkey, timestamp: rumor.created_at)
+        return try createGiftWrap(seal: seal, recipientPubkey: recipientPubkey)
     }
+    #endif
 
     /// Create a geohash-scoped ephemeral public message (kind 20000)
-    public static func createEphemeralGeohashEvent(
+    static func createEphemeralGeohashEvent(
         content: String,
         geohash: String,
         senderIdentity: NostrIdentity,
@@ -109,7 +190,7 @@ public struct NostrProtocol {
 
     /// Create a geohash presence heartbeat (kind 20001)
     /// Must contain empty content and NO nickname tag
-    public static func createGeohashPresenceEvent(
+    static func createGeohashPresenceEvent(
         geohash: String,
         senderIdentity: NostrIdentity
     ) throws -> NostrEvent {
@@ -126,7 +207,7 @@ public struct NostrProtocol {
     }
 
     /// Create a persistent location note (kind 1: text note) tagged to a street-level geohash.
-    public static func createGeohashTextNote(
+    static func createGeohashTextNote(
         content: String,
         geohash: String,
         senderIdentity: NostrIdentity,
@@ -146,21 +227,22 @@ public struct NostrProtocol {
         let schnorrKey = try senderIdentity.schnorrSigningKey()
         return try event.sign(with: schnorrKey)
     }
-
+    
     // MARK: - Private Methods
-
+    
     private static func createSeal(
         rumor: NostrEvent,
         recipientPubkey: String,
         senderKey: P256K.Schnorr.PrivateKey
     ) throws -> NostrEvent {
+        
         let rumorJSON = try rumor.jsonString()
         let encrypted = try encrypt(
             plaintext: rumorJSON,
             recipientPubkey: recipientPubkey,
             senderKey: senderKey
         )
-
+        
         let seal = NostrEvent(
             pubkey: Data(senderKey.xonly.bytes).hexEncodedString(),
             createdAt: randomizedTimestamp(),
@@ -168,111 +250,132 @@ public struct NostrProtocol {
             tags: [],
             content: encrypted
         )
-
+        
+        // Sign the seal with the sender's Schnorr private key
         return try seal.sign(with: senderKey)
     }
-
+    
     private static func createGiftWrap(
         seal: NostrEvent,
-        recipientPubkey: String,
-        senderKey: P256K.Schnorr.PrivateKey
+        recipientPubkey: String
     ) throws -> NostrEvent {
-        let sealJSON = try seal.jsonString()
-        let wrapKey = try P256K.Schnorr.PrivateKey()
 
+        let sealJSON = try seal.jsonString()
+        
+        // Create new ephemeral key for gift wrap
+        let wrapKey = try P256K.Schnorr.PrivateKey()
+        // Creating gift wrap with ephemeral key
+        
+        // Encrypt the seal with the new ephemeral key (not the seal's key)
         let encrypted = try encrypt(
             plaintext: sealJSON,
             recipientPubkey: recipientPubkey,
-            senderKey: wrapKey
+            senderKey: wrapKey  // Use the gift wrap ephemeral key
         )
-
+        
         let giftWrap = NostrEvent(
             pubkey: Data(wrapKey.xonly.bytes).hexEncodedString(),
             createdAt: randomizedTimestamp(),
             kind: .giftWrap,
-            tags: [["p", recipientPubkey]],
+            tags: [["p", recipientPubkey]], // Tag recipient
             content: encrypted
         )
-
+        
+        // Sign the gift wrap with the wrap Schnorr private key
         return try giftWrap.sign(with: wrapKey)
     }
-
+    
     private static func unwrapGiftWrap(
         giftWrap: NostrEvent,
         recipientKey: P256K.Schnorr.PrivateKey
     ) throws -> NostrEvent {
+        
+        // Unwrapping gift wrap
+        
         let decrypted = try decrypt(
             ciphertext: giftWrap.content,
             senderPubkey: giftWrap.pubkey,
             recipientKey: recipientKey
         )
-
+        
         guard let data = decrypted.data(using: .utf8),
               let sealDict = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
             throw NostrError.invalidEvent
         }
-
-        return try NostrEvent(from: sealDict)
+        
+        let seal = try NostrEvent(from: sealDict)
+        // Unwrapped seal
+        
+        return seal
     }
-
+    
     private static func openSeal(
         seal: NostrEvent,
         recipientKey: P256K.Schnorr.PrivateKey
     ) throws -> NostrEvent {
+        
         let decrypted = try decrypt(
             ciphertext: seal.content,
             senderPubkey: seal.pubkey,
             recipientKey: recipientKey
         )
-
+        
         guard let data = decrypted.data(using: .utf8),
               let rumorDict = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
             throw NostrError.invalidEvent
         }
-
+        
         return try NostrEvent(from: rumorDict)
     }
-
+    
     // MARK: - Encryption (NIP-44 v2)
-
+    
     private static func encrypt(
         plaintext: String,
         recipientPubkey: String,
         senderKey: P256K.Schnorr.PrivateKey
     ) throws -> String {
+        
         guard let recipientPubkeyData = Data(hexString: recipientPubkey) else {
             throw NostrError.invalidPublicKey
         }
-
+        
+        // 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)
-
+        
+        // 24-byte random nonce for XChaCha20-Poly1305
         var nonce24 = Data(count: 24)
         _ = nonce24.withUnsafeMutableBytes { ptr in
             SecRandomCopyBytes(kSecRandomDefault, 24, ptr.baseAddress!)
         }
-
+        
         let pt = Data(plaintext.utf8)
         let sealed = try XChaCha20Poly1305Compat.seal(plaintext: pt, key: key, nonce24: nonce24)
-
+        
+        // v2: base64url(nonce24 || ciphertext || tag)
         var combined = Data()
         combined.append(nonce24)
         combined.append(sealed.ciphertext)
         combined.append(sealed.tag)
-        return "v2:" + base64URLEncode(combined)
+        return "v2:" + Base64URLCoding.encode(combined)
     }
-
+    
     private static func decrypt(
         ciphertext: String,
         senderPubkey: String,
         recipientKey: P256K.Schnorr.PrivateKey
     ) throws -> String {
+        // Expect NIP-44 v2 format
         guard ciphertext.hasPrefix("v2:") else { throw NostrError.invalidCiphertext }
         let encoded = String(ciphertext.dropFirst(3))
-        guard let data = base64URLDecode(encoded),
+        guard let data = Base64URLCoding.decode(encoded),
               data.count > (24 + 16),
               let senderPubkeyData = Data(hexString: senderPubkey) else {
             throw NostrError.invalidCiphertext
@@ -283,6 +386,7 @@ public struct NostrProtocol {
         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)
@@ -294,6 +398,7 @@ public struct NostrProtocol {
             )
         }
 
+        // 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) {
@@ -307,23 +412,32 @@ public struct NostrProtocol {
             return String(data: pt, encoding: .utf8) ?? ""
         }
     }
-
+    
     private static func deriveSharedSecret(
         privateKey: P256K.Schnorr.PrivateKey,
         publicKey: Data
     ) throws -> Data {
+        // Deriving shared secret
+        
+        // Convert Schnorr private key to KeyAgreement private key
         let keyAgreementPrivateKey = try P256K.KeyAgreement.PrivateKey(
             dataRepresentation: privateKey.dataRepresentation
         )
-
+        
+        // Create KeyAgreement public key from the public key data
+        // For ECDH, we need the full 33-byte compressed public key (with 0x02 or 0x03 prefix)
         var fullPublicKey = Data()
-        if publicKey.count == 32 {
+        if publicKey.count == 32 { // X-only key, need to add prefix
+            // For x-only keys in Nostr/Bitcoin, we need to try both possible Y coordinates
+            // First try with even Y (0x02 prefix)
             fullPublicKey.append(0x02)
             fullPublicKey.append(publicKey)
+            // Trying with even Y coordinate
         } else {
             fullPublicKey = publicKey
         }
-
+        
+        // Try to create public key, if it fails with even Y, try odd Y
         let keyAgreementPublicKey: P256K.KeyAgreement.PublicKey
         do {
             keyAgreementPublicKey = try P256K.KeyAgreement.PublicKey(
@@ -332,6 +446,8 @@ public struct NostrProtocol {
             )
         } catch {
             if publicKey.count == 32 {
+                // Try with odd Y (0x03 prefix)
+                // Even Y failed, trying odd Y
                 fullPublicKey = Data()
                 fullPublicKey.append(0x03)
                 fullPublicKey.append(publicKey)
@@ -343,32 +459,85 @@ public struct NostrProtocol {
                 throw error
             }
         }
-
+        
+        // Perform ECDH
         let sharedSecret = try keyAgreementPrivateKey.sharedSecretFromKeyAgreement(
             with: keyAgreementPublicKey,
             format: .compressed
         )
-
-        return sharedSecret.withUnsafeBytes { Data($0) }
+        
+        // Convert SharedSecret to Data
+        let sharedSecretData = sharedSecret.withUnsafeBytes { Data($0) }
+        // ECDH shared secret derived
+        
+        // Return raw ECDH shared secret; HKDF is applied by deriveNIP44V2Key
+        return sharedSecretData
     }
-
+    
+    // Direct version that doesn't try to add prefixes
+    private static func deriveSharedSecretDirect(
+        privateKey: P256K.Schnorr.PrivateKey,
+        publicKey: Data
+    ) throws -> Data {
+        // Direct shared secret calculation
+        
+        // Convert Schnorr private key to KeyAgreement private key
+        let keyAgreementPrivateKey = try P256K.KeyAgreement.PrivateKey(
+            dataRepresentation: privateKey.dataRepresentation
+        )
+        
+        // Use the public key as-is (should already have prefix)
+        let keyAgreementPublicKey = try P256K.KeyAgreement.PublicKey(
+            dataRepresentation: publicKey,
+            format: .compressed
+        )
+        
+        // Perform ECDH
+        let sharedSecret = try keyAgreementPrivateKey.sharedSecretFromKeyAgreement(
+            with: keyAgreementPublicKey,
+            format: .compressed
+        )
+        
+        // Convert SharedSecret to Data
+        let sharedSecretData = sharedSecret.withUnsafeBytes { Data($0) }
+        
+        // Return raw ECDH shared secret; HKDF is applied by deriveNIP44V2Key
+        return sharedSecretData
+    }
+    
     private static func randomizedTimestamp() -> Date {
-        let offset = TimeInterval.random(in: -900...900)
-        return Date().addingTimeInterval(offset)
+        // Add random offset to current time for privacy
+        // 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")
+        
+        formatter.timeZone = TimeZone.current
+        
+        // Timestamp randomized for privacy
+        
+        return randomized
     }
 }
 
 /// Nostr Event structure
-public struct NostrEvent: Codable, Sendable {
-    public var id: String
-    public let pubkey: String
-    public let created_at: Int
-    public let kind: Int
-    public let tags: [[String]]
-    public let content: String
-    public var sig: String?
-
-    public init(
+struct NostrEvent: Codable {
+    var id: String
+    let pubkey: String
+    let created_at: Int
+    let kind: Int
+    let tags: [[String]]
+    let content: String
+    var sig: String?
+    
+    init(
         pubkey: String,
         createdAt: Date,
         kind: NostrProtocol.EventKind,
@@ -381,10 +550,10 @@ public struct NostrEvent: Codable, Sendable {
         self.tags = tags
         self.content = content
         self.sig = nil
-        self.id = ""
+        self.id = "" // Will be set during signing
     }
-
-    public init(from dict: [String: Any]) throws {
+    
+    init(from dict: [String: Any]) throws {
         guard let pubkey = dict["pubkey"] as? String,
               let createdAt = dict["created_at"] as? Int,
               let kind = dict["kind"] as? Int,
@@ -392,7 +561,7 @@ public struct NostrEvent: Codable, Sendable {
               let content = dict["content"] as? String else {
             throw NostrError.invalidEvent
         }
-
+        
         self.id = dict["id"] as? String ?? ""
         self.pubkey = pubkey
         self.created_at = createdAt
@@ -401,19 +570,20 @@ public struct NostrEvent: Codable, Sendable {
         self.content = content
         self.sig = dict["sig"] as? String
     }
-
-    public func sign(with key: P256K.Schnorr.PrivateKey) throws -> NostrEvent {
+    
+    func sign(with key: P256K.Schnorr.PrivateKey) throws -> NostrEvent {
         let (eventId, eventIdHash) = try calculateEventId()
-
+        
+        // Sign with Schnorr (BIP-340)
         var messageBytes = [UInt8](eventIdHash)
         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()
-
+        
         var signed = self
         signed.id = eventId
         signed.sig = signatureHex
@@ -422,7 +592,7 @@ public struct NostrEvent: Codable, Sendable {
 
     /// Validate that the event ID and Schnorr signature match the content and pubkey.
     /// Returns false when the signature is missing, malformed, or does not verify.
-    public func isValidSignature() -> Bool {
+    func isValidSignature() -> Bool {
         guard let sig = sig,
               let sigData = Data(hexString: sig),
               let pubData = Data(hexString: pubkey),
@@ -439,7 +609,7 @@ public struct NostrEvent: Codable, Sendable {
         let xonly = P256K.Schnorr.XonlyKey(dataRepresentation: pubData)
         return xonly.isValid(signature, for: &messageBytes)
     }
-
+    
     private func calculateEventId() throws -> (String, Data) {
         let serialized = [
             0,
@@ -449,12 +619,12 @@ public struct NostrEvent: Codable, Sendable {
             tags,
             content
         ] as [Any]
-
+        
         let data = try JSONSerialization.data(withJSONObject: serialized, options: [.withoutEscapingSlashes])
         return (data.sha256Fingerprint(), data.sha256Hash())
     }
-
-    public func jsonString() throws -> String {
+    
+    func jsonString() throws -> String {
         let encoder = JSONEncoder()
         encoder.outputFormatting = [.withoutEscapingSlashes]
         let data = try encoder.encode(self)
@@ -462,7 +632,7 @@ public struct NostrEvent: Codable, Sendable {
     }
 }
 
-public enum NostrError: Error, Sendable {
+enum NostrError: Error {
     case invalidPublicKey
     case invalidPrivateKey
     case invalidEvent
@@ -471,24 +641,9 @@ public enum NostrError: Error, Sendable {
     case encryptionFailed
 }
 
-// MARK: - NIP-44 v2 helpers (XChaCha20-Poly1305 + base64url)
+// MARK: - NIP-44 v2 helpers (XChaCha20-Poly1305)
 
 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),

bitchat/Nostr/NostrRelayURL.swift

@@ -0,0 +1,51 @@
+import Foundation
+
+enum NostrRelayURL {
+    static func normalized(_ rawValue: String, defaultScheme: String? = nil) -> String? {
+        var value = rawValue.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !value.isEmpty else { return nil }
+
+        if !value.contains("://"), let defaultScheme {
+            value = "\(defaultScheme)://\(value)"
+        }
+
+        guard var components = URLComponents(string: value),
+              let rawScheme = components.scheme?.lowercased(),
+              let rawHost = components.host?.lowercased(),
+              !rawHost.isEmpty else {
+            return nil
+        }
+
+        switch rawScheme {
+        case "wss", "https":
+            components.scheme = "wss"
+            if components.port == 443 {
+                components.port = nil
+            }
+        case "ws", "http":
+            components.scheme = "ws"
+            if components.port == 80 {
+                components.port = nil
+            }
+        default:
+            return nil
+        }
+
+        components.host = rawHost
+        if components.path == "/" {
+            components.path = ""
+        }
+        components.fragment = nil
+
+        return components.string
+    }
+
+    static func directoryAddress(_ rawValue: String) -> String? {
+        guard var normalized = normalized(rawValue, defaultScheme: "wss") else { return nil }
+        for prefix in ["wss://", "ws://"] where normalized.hasPrefix(prefix) {
+            normalized.removeFirst(prefix.count)
+            break
+        }
+        return normalized
+    }
+}

bitchat/Nostr/XChaCha20Poly1305Compat.swift

@@ -6,6 +6,7 @@ import CryptoKit
 /// 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)
@@ -58,6 +59,7 @@ enum XChaCha20Poly1305Compat {
     }
 
     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)
         }
@@ -68,22 +70,28 @@ enum XChaCha20Poly1305Compat {
         // 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)
@@ -124,3 +132,4 @@ private extension Data {
         replaceSubrange(offset..<(offset+4), with: bytes)
     }
 }
+

bitchat/Protocols/BitchatFilePacket.swift

@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import BitFoundation
 import BitLogger
 
 /// TLV payload for Bluetooth mesh file transfers (voice notes, images, generic files).

bitchat/Protocols/BitchatProtocol.swift

@@ -62,40 +62,6 @@ import Foundation
 import CoreBluetooth
 import BitFoundation
 
-// MARK: - Message Types
-
-/// Simplified BitChat protocol message types.
-/// Reduced from 24 types to just 6 essential ones.
-/// All private communication metadata (receipts, status) is embedded in noiseEncrypted payloads.
-enum MessageType: UInt8 {
-    // Public messages (unencrypted)
-    case announce = 0x01        // "I'm here" with nickname
-    case message = 0x02         // Public chat message  
-    case leave = 0x03           // "I'm leaving"
-    case requestSync = 0x21     // GCS filter-based sync request (local-only)
-    
-    // Noise encryption
-    case noiseHandshake = 0x10  // Handshake (init or response determined by payload)
-    case noiseEncrypted = 0x11  // All encrypted payloads (messages, receipts, etc.)
-    
-    // Fragmentation (simplified)
-    case fragment = 0x20        // Single fragment type for large messages
-    case fileTransfer = 0x22    // Binary file/audio/image payloads
-    
-    var description: String {
-        switch self {
-        case .announce: return "announce"
-        case .message: return "message"
-        case .leave: return "leave"
-        case .requestSync: return "requestSync"
-        case .noiseHandshake: return "noiseHandshake"
-        case .noiseEncrypted: return "noiseEncrypted"
-        case .fragment: return "fragment"
-        case .fileTransfer: return "fileTransfer"
-        }
-    }
-}
-
 // MARK: - Noise Payload Types
 
 /// Types of payloads embedded within noiseEncrypted messages.
@@ -132,35 +98,6 @@ enum LazyHandshakeState {
     case failed(Error)         // Handshake failed
 }
 
-// MARK: - Delivery Status
-
-// Delivery status for messages
-enum DeliveryStatus: Codable, Equatable, Hashable {
-    case sending
-    case sent  // Left our device
-    case delivered(to: String, at: Date)  // Confirmed by recipient
-    case read(by: String, at: Date)  // Seen by recipient
-    case failed(reason: String)
-    case partiallyDelivered(reached: Int, total: Int)  // For rooms
-    
-    var displayText: String {
-        switch self {
-        case .sending:
-            return "Sending..."
-        case .sent:
-            return "Sent"
-        case .delivered(let nickname, _):
-            return "Delivered to \(nickname)"
-        case .read(let nickname, _):
-            return "Read by \(nickname)"
-        case .failed(let reason):
-            return "Failed: \(reason)"
-        case .partiallyDelivered(let reached, let total):
-            return "Delivered to \(reached)/\(total)"
-        }
-    }
-}
-
 // MARK: - Delegate Protocol
 
 protocol BitchatDelegate: AnyObject {

bitchat/Services/BLE/BLEAnnounceHandler.swift

@@ -0,0 +1,214 @@
+import BitFoundation
+import BitLogger
+import Foundation
+
+/// Narrow environment for `BLEAnnounceHandler`.
+///
+/// All queue hops (collections barrier, BLE-queue link-state reads, main-actor
+/// UI notification, delayed re-announce) live inside the closures supplied by
+/// `BLEService`, keeping the handler queue-agnostic and synchronously testable.
+struct BLEAnnounceHandlerEnvironment {
+    /// Local peer identity at the time the announce is handled.
+    let localPeerID: () -> PeerID
+    /// TTL value used for direct (non-relayed) packets.
+    let messageTTL: UInt8
+    /// Current time source.
+    let now: () -> Date
+    /// Noise public key already recorded for the peer, if any (registry read).
+    let existingNoisePublicKey: (PeerID) -> Data?
+    /// Verifies the packet signature against the announced signing key.
+    let verifySignature: (_ packet: BitchatPacket, _ signingPublicKey: Data) -> Bool
+    /// Direct link state for the peer (BLE-queue read).
+    let linkState: (PeerID) -> (hasPeripheral: Bool, hasCentral: Bool)
+    /// Runs the registry mutation phase under the collections barrier.
+    let withRegistryBarrier: (() -> Void) -> Void
+    /// Upserts the verified announce into the peer registry.
+    /// Must only be called from inside `withRegistryBarrier`.
+    let upsertVerifiedAnnounce: (
+        _ peerID: PeerID,
+        _ announcement: AnnouncementPacket,
+        _ isConnected: Bool,
+        _ now: Date
+    ) -> BLEPeerAnnounceUpdate
+    /// Debounced reconnect-log decision.
+    /// Must only be called from inside `withRegistryBarrier`.
+    let shouldEmitReconnectLog: (_ peerID: PeerID, _ now: Date) -> Bool
+    /// Records verified direct-neighbor claims in the mesh topology.
+    let updateTopology: (_ peerID: PeerID, _ neighbors: [Data]) -> Void
+    /// Persists the announced cryptographic identity for offline verification.
+    let persistIdentity: (AnnouncementPacket) -> Void
+    /// Announce-back dedup check.
+    let dedupContains: (String) -> Bool
+    /// Announce-back dedup marking.
+    let dedupMarkProcessed: (String) -> Void
+    /// Delivers the announce UI events as one ordered main-actor hop:
+    /// `.peerConnected` (if flagged) → initial gossip sync scheduling (if
+    /// flagged) → peer-ID snapshot + data publish + `.peerListUpdated`.
+    /// A single closure keeps the original in-order delivery guarantee that
+    /// separate unstructured tasks would not provide.
+    let deliverAnnounceUIEvents: (
+        _ peerID: PeerID,
+        _ notifyPeerConnected: Bool,
+        _ scheduleInitialSync: Bool
+    ) -> Void
+    /// Tracks the announce packet for gossip sync.
+    let trackPacketSeen: (BitchatPacket) -> Void
+    /// Reciprocates the announce for bidirectional discovery.
+    let sendAnnounceBack: () -> Void
+    /// Schedules a delayed re-announce (afterglow) after the given delay.
+    let scheduleAfterglow: (TimeInterval) -> Void
+}
+
+/// Orchestrates inbound announce packets: preflight validation, signature
+/// trust, registry/topology updates, identity persistence, UI notification,
+/// gossip tracking, and the reciprocal announce response.
+final class BLEAnnounceHandler {
+    private let environment: BLEAnnounceHandlerEnvironment
+
+    init(environment: BLEAnnounceHandlerEnvironment) {
+        self.environment = environment
+    }
+
+    func handle(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        let now = env.now()
+        let preflight = BLEAnnouncePreflightPolicy.evaluate(
+            packet: packet,
+            from: peerID,
+            localPeerID: env.localPeerID(),
+            now: now
+        )
+
+        let announcement: AnnouncementPacket
+        switch preflight {
+        case .accept(let acceptance):
+            announcement = acceptance.announcement
+        case .reject(.malformed):
+            SecureLogger.error("❌ Failed to decode announce packet from \(peerID.id.prefix(8))…", category: .session)
+            return
+        case .reject(.senderMismatch(let derivedFromKey)):
+            SecureLogger.warning("⚠️ Announce sender mismatch: derived \(derivedFromKey.id.prefix(8))… vs packet \(peerID.id.prefix(8))…", category: .security)
+            return
+        case .reject(.selfAnnounce):
+            return
+        case .reject(.stale(let ageSeconds)):
+            SecureLogger.debug("⏰ Ignoring stale announce from \(peerID.id.prefix(8))… (age: \(ageSeconds)s)", category: .session)
+            return
+        }
+
+        // Suppress announce logs to reduce noise
+
+        // Precompute signature verification outside barrier to reduce contention
+        let existingNoisePublicKey = env.existingNoisePublicKey(peerID)
+        let hasSignature = packet.signature != nil
+        let signatureValid: Bool
+        if hasSignature {
+            signatureValid = env.verifySignature(packet, announcement.signingPublicKey)
+            if !signatureValid {
+                SecureLogger.warning("⚠️ Signature verification for announce failed \(peerID.id.prefix(8))", category: .security)
+            }
+        } else {
+            signatureValid = false
+        }
+        let trustDecision = BLEAnnounceTrustPolicy.evaluate(
+            hasSignature: hasSignature,
+            signatureValid: signatureValid,
+            existingNoisePublicKey: existingNoisePublicKey,
+            announcedNoisePublicKey: announcement.noisePublicKey
+        )
+        if case .reject(.keyMismatch) = trustDecision {
+            SecureLogger.warning("⚠️ Announce key mismatch for \(peerID.id.prefix(8))… — keeping unverified", category: .security)
+        }
+        let verifiedAnnounce = trustDecision.isVerified
+
+        var isNewPeer = false
+        var isReconnectedPeer = false
+        let directLinkState = env.linkState(peerID)
+        let isDirectAnnounce = packet.ttl == env.messageTTL
+
+        env.withRegistryBarrier {
+            let hasPeripheralConnection = directLinkState.hasPeripheral
+            let hasCentralSubscription = directLinkState.hasCentral
+
+            // Require verified announce; ignore otherwise (no backward compatibility)
+            if !verifiedAnnounce {
+                SecureLogger.warning("❌ Ignoring unverified announce from \(peerID.id.prefix(8))…", category: .security)
+                // Reset flags to prevent post-barrier code from acting on unverified announces
+                isNewPeer = false
+                isReconnectedPeer = false
+                return
+            }
+
+            let update = env.upsertVerifiedAnnounce(
+                peerID,
+                announcement,
+                isDirectAnnounce || hasPeripheralConnection || hasCentralSubscription,
+                now
+            )
+            isNewPeer = update.isNewPeer
+            isReconnectedPeer = update.wasDisconnected
+
+            // Log connection status only for direct connectivity changes; debounce to reduce spam
+            if isDirectAnnounce || hasPeripheralConnection || hasCentralSubscription {
+                let now = env.now()
+                if update.isNewPeer {
+                    SecureLogger.debug("🆕 New peer: \(announcement.nickname)", category: .session)
+                } else if update.wasDisconnected {
+                    if env.shouldEmitReconnectLog(peerID, now) {
+                        SecureLogger.debug("🔄 Peer \(announcement.nickname) reconnected", category: .session)
+                    }
+                } else if let previousNickname = update.previousNickname, previousNickname != announcement.nickname {
+                    SecureLogger.debug("🔄 Peer \(peerID.id.prefix(8))… changed nickname: \(previousNickname) -> \(announcement.nickname)", category: .session)
+                }
+            }
+        }
+
+        // Update topology with verified neighbor claims (only for authenticated announces)
+        if verifiedAnnounce, let neighbors = announcement.directNeighbors {
+            env.updateTopology(peerID, neighbors)
+        }
+
+        // Persist cryptographic identity and signing key for robust offline
+        // verification — only for verified announces. Persisting unverified
+        // announces would let an attacker who replays a victim's noisePublicKey
+        // overwrite the victim's stored signing key/nickname (identity poisoning).
+        if verifiedAnnounce {
+            env.persistIdentity(announcement)
+        }
+
+        let announceBackID = "announce-back-\(peerID)"
+        let shouldSendBack = !env.dedupContains(announceBackID)
+        if shouldSendBack {
+            env.dedupMarkProcessed(announceBackID)
+        }
+        let responsePlan = BLEAnnounceResponsePolicy.plan(
+            isDirectAnnounce: isDirectAnnounce,
+            isNewPeer: isNewPeer,
+            isReconnectedPeer: isReconnectedPeer,
+            shouldSendAnnounceBack: shouldSendBack
+        )
+
+        // Only notify of connection for new or reconnected peers when it is a
+        // direct announce; the list update always follows in the same hop.
+        env.deliverAnnounceUIEvents(
+            peerID,
+            responsePlan.shouldNotifyPeerConnected,
+            responsePlan.shouldNotifyPeerConnected && responsePlan.shouldScheduleInitialSync
+        )
+
+        // Track for sync (include our own and others' announces)
+        env.trackPacketSeen(packet)
+
+        if responsePlan.shouldSendAnnounceBack {
+            // Reciprocate announce for bidirectional discovery
+            // Force send to ensure the peer receives our announce
+            env.sendAnnounceBack()
+        }
+
+        // Afterglow: on first-seen peers, schedule a short re-announce to push presence one more hop
+        if responsePlan.shouldScheduleAfterglow {
+            let delay = Double.random(in: 0.3...0.6)
+            env.scheduleAfterglow(delay)
+        }
+    }
+}

bitchat/Services/BLE/BLEAnnounceHandlingPolicy.swift

@@ -0,0 +1,116 @@
+import BitFoundation
+import Foundation
+
+struct BLEAnnouncePreflightAcceptance {
+    let announcement: AnnouncementPacket
+    let derivedPeerID: PeerID
+}
+
+enum BLEAnnouncePreflightRejection: Equatable {
+    case malformed
+    case senderMismatch(derivedPeerID: PeerID)
+    case selfAnnounce
+    case stale(ageSeconds: Double)
+}
+
+enum BLEAnnouncePreflightDecision {
+    case accept(BLEAnnouncePreflightAcceptance)
+    case reject(BLEAnnouncePreflightRejection)
+}
+
+enum BLEAnnouncePreflightPolicy {
+    static func evaluate(
+        packet: BitchatPacket,
+        from peerID: PeerID,
+        localPeerID: PeerID,
+        now: Date
+    ) -> BLEAnnouncePreflightDecision {
+        guard let announcement = AnnouncementPacket.decode(from: packet.payload) else {
+            return .reject(.malformed)
+        }
+
+        let derivedPeerID = PeerID(publicKey: announcement.noisePublicKey)
+        guard derivedPeerID == peerID else {
+            return .reject(.senderMismatch(derivedPeerID: derivedPeerID))
+        }
+
+        guard peerID != localPeerID else {
+            return .reject(.selfAnnounce)
+        }
+
+        guard !BLEPacketFreshnessPolicy.isStale(timestampMilliseconds: packet.timestamp, now: now) else {
+            return .reject(.stale(ageSeconds: BLEPacketFreshnessPolicy.ageSeconds(
+                timestampMilliseconds: packet.timestamp,
+                now: now
+            )))
+        }
+
+        return .accept(BLEAnnouncePreflightAcceptance(
+            announcement: announcement,
+            derivedPeerID: derivedPeerID
+        ))
+    }
+}
+
+enum BLEAnnounceTrustRejection: Equatable {
+    case missingSignature
+    case invalidSignature
+    case keyMismatch
+}
+
+enum BLEAnnounceTrustDecision: Equatable {
+    case verified
+    case reject(BLEAnnounceTrustRejection)
+
+    var isVerified: Bool {
+        self == .verified
+    }
+}
+
+enum BLEAnnounceTrustPolicy {
+    static func evaluate(
+        hasSignature: Bool,
+        signatureValid: Bool,
+        existingNoisePublicKey: Data?,
+        announcedNoisePublicKey: Data
+    ) -> BLEAnnounceTrustDecision {
+        if let existingNoisePublicKey, existingNoisePublicKey != announcedNoisePublicKey {
+            return .reject(.keyMismatch)
+        }
+
+        guard hasSignature else {
+            return .reject(.missingSignature)
+        }
+
+        guard signatureValid else {
+            return .reject(.invalidSignature)
+        }
+
+        return .verified
+    }
+}
+
+struct BLEAnnounceResponsePlan: Equatable {
+    let shouldNotifyPeerConnected: Bool
+    let shouldScheduleInitialSync: Bool
+    let shouldSendAnnounceBack: Bool
+    let shouldScheduleAfterglow: Bool
+}
+
+enum BLEAnnounceResponsePolicy {
+    static func plan(
+        isDirectAnnounce: Bool,
+        isNewPeer: Bool,
+        isReconnectedPeer: Bool,
+        shouldSendAnnounceBack: Bool
+    ) -> BLEAnnounceResponsePlan {
+        let shouldNotifyPeerConnected = isDirectAnnounce && (isNewPeer || isReconnectedPeer)
+
+        return BLEAnnounceResponsePlan(
+            shouldNotifyPeerConnected: shouldNotifyPeerConnected,
+            shouldScheduleInitialSync: shouldNotifyPeerConnected,
+            shouldSendAnnounceBack: shouldSendAnnounceBack,
+            shouldScheduleAfterglow: isNewPeer
+        )
+    }
+}

bitchat/Services/BLE/BLEAnnounceThrottle.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+struct BLEAnnounceThrottle {
+    private var lastSent: Date
+    private let normalMinimumInterval: TimeInterval
+    private let forcedMinimumInterval: TimeInterval
+
+    init(
+        lastSent: Date = .distantPast,
+        normalMinimumInterval: TimeInterval = TransportConfig.bleAnnounceMinInterval,
+        forcedMinimumInterval: TimeInterval = TransportConfig.bleForceAnnounceMinIntervalSeconds
+    ) {
+        self.lastSent = lastSent
+        self.normalMinimumInterval = normalMinimumInterval
+        self.forcedMinimumInterval = forcedMinimumInterval
+    }
+
+    func elapsed(since now: Date) -> TimeInterval {
+        now.timeIntervalSince(lastSent)
+    }
+
+    mutating func shouldSend(force: Bool, now: Date) -> Bool {
+        let minimumInterval = force ? forcedMinimumInterval : normalMinimumInterval
+        guard elapsed(since: now) >= minimumInterval else {
+            return false
+        }
+
+        lastSent = now
+        return true
+    }
+}

bitchat/Services/BLE/BLEConnectionScheduler.swift

@@ -0,0 +1,293 @@
+import Foundation
+
+struct BLEConnectionCandidate<Peripheral> {
+    let peripheral: Peripheral
+    let peripheralID: String
+    let rssi: Int
+    let name: String
+    let isConnectable: Bool
+    let discoveredAt: Date
+}
+
+struct BLEExistingConnectionState {
+    let isConnecting: Bool
+    let isConnected: Bool
+    let lastConnectionAttempt: Date?
+}
+
+enum BLEPeripheralConnectionState {
+    case disconnected
+    case connecting
+    case connected
+}
+
+enum BLEDiscoveryDecision: Equatable {
+    case ignore
+    case queued
+    case scheduleRetry(after: TimeInterval)
+    case cancelStaleConnection
+    case connectNow
+}
+
+enum BLEConnectionQueueDecision<Peripheral> {
+    case none
+    case retryAfter(TimeInterval)
+    case connect(BLEConnectionCandidate<Peripheral>)
+}
+
+final class BLEConnectionScheduler<Peripheral> {
+    private let maxCentralLinks: Int
+    private let connectRateLimitInterval: TimeInterval
+    private let candidateCap: Int
+    private let weakLinkCooldownSeconds: TimeInterval
+    private let weakLinkRSSICutoff: Int
+
+    private var lastGlobalConnectAttempt: Date = .distantPast
+    private var candidates: [BLEConnectionCandidate<Peripheral>] = []
+    private var failureCounts: [String: Int] = [:]
+    private var recentConnectTimeouts: [String: Date] = [:]
+    // Tracked separately from connect timeouts: a peer we held a connection
+    // with and lost (walked out of range) usually comes back, so it only gets
+    // a brief rediscovery ignore — not the timeout backoff/cooldown treatment
+    // reserved for peers that never answered a connect attempt.
+    private var recentDisconnects: [String: Date] = [:]
+    private var lastIsolatedAt: Date?
+
+    private let initialDynamicRSSIThreshold: Int
+    private(set) var dynamicRSSIThreshold: Int
+
+    var candidateCount: Int {
+        candidates.count
+    }
+
+    init(
+        maxCentralLinks: Int = TransportConfig.bleMaxCentralLinks,
+        connectRateLimitInterval: TimeInterval = TransportConfig.bleConnectRateLimitInterval,
+        candidateCap: Int = TransportConfig.bleConnectionCandidatesMax,
+        weakLinkCooldownSeconds: TimeInterval = TransportConfig.bleWeakLinkCooldownSeconds,
+        weakLinkRSSICutoff: Int = TransportConfig.bleWeakLinkRSSICutoff,
+        dynamicRSSIThreshold: Int = TransportConfig.bleDynamicRSSIThresholdDefault
+    ) {
+        self.maxCentralLinks = maxCentralLinks
+        self.connectRateLimitInterval = connectRateLimitInterval
+        self.candidateCap = candidateCap
+        self.weakLinkCooldownSeconds = weakLinkCooldownSeconds
+        self.weakLinkRSSICutoff = weakLinkRSSICutoff
+        self.initialDynamicRSSIThreshold = dynamicRSSIThreshold
+        self.dynamicRSSIThreshold = dynamicRSSIThreshold
+    }
+
+    func handleDiscovery(
+        _ candidate: BLEConnectionCandidate<Peripheral>,
+        connectedOrConnectingCount: Int,
+        existingState: BLEExistingConnectionState?,
+        peripheralState: BLEPeripheralConnectionState,
+        now: Date
+    ) -> BLEDiscoveryDecision {
+        guard candidate.isConnectable else { return .ignore }
+
+        if candidate.rssi <= dynamicRSSIThreshold {
+            enqueue(candidate)
+            return .queued
+        }
+
+        if connectedOrConnectingCount >= maxCentralLinks {
+            enqueue(candidate)
+            return .queued
+        }
+
+        if let retryDelay = rateLimitRetryDelay(now: now) {
+            enqueue(candidate)
+            return .scheduleRetry(after: retryDelay)
+        }
+
+        if let existingState {
+            if existingState.isConnected || existingState.isConnecting {
+                return .ignore
+            }
+
+            if let lastAttempt = existingState.lastConnectionAttempt,
+               now.timeIntervalSince(lastAttempt) < 2.0 {
+                return .ignore
+            }
+        }
+
+        if let lastTimeout = recentConnectTimeouts[candidate.peripheralID],
+           now.timeIntervalSince(lastTimeout) < TransportConfig.bleTimeoutDiscoveryIgnoreSeconds {
+            return .ignore
+        }
+
+        if let lastDisconnect = recentDisconnects[candidate.peripheralID],
+           now.timeIntervalSince(lastDisconnect) < TransportConfig.bleDisconnectDiscoveryIgnoreSeconds {
+            return .ignore
+        }
+
+        switch peripheralState {
+        case .disconnected:
+            return .connectNow
+        case .connecting, .connected:
+            return .cancelStaleConnection
+        }
+    }
+
+    func enqueue(_ candidate: BLEConnectionCandidate<Peripheral>) {
+        if let existingIndex = candidates.firstIndex(where: { $0.peripheralID == candidate.peripheralID }) {
+            candidates[existingIndex] = candidate
+        } else {
+            candidates.append(candidate)
+        }
+
+        candidates.sort {
+            if $0.rssi != $1.rssi { return $0.rssi > $1.rssi }
+            return $0.discoveredAt < $1.discoveredAt
+        }
+        if candidates.count > candidateCap {
+            candidates.removeLast(candidates.count - candidateCap)
+        }
+    }
+
+    func nextCandidate(
+        connectedOrConnectingCount: Int,
+        isAlreadyConnectingOrConnected: (String) -> Bool,
+        now: Date
+    ) -> BLEConnectionQueueDecision<Peripheral> {
+        guard connectedOrConnectingCount < maxCentralLinks else { return .none }
+
+        if let retryDelay = rateLimitRetryDelay(now: now) {
+            return .retryAfter(retryDelay)
+        }
+
+        while !candidates.isEmpty {
+            candidates.sort { score($0, now: now) > score($1, now: now) }
+            let candidate = candidates.removeFirst()
+            guard candidate.isConnectable else { continue }
+
+            if let delay = weakLinkRetryDelay(for: candidate, now: now) {
+                enqueue(candidate)
+                return .retryAfter(delay)
+            }
+
+            if let delay = disconnectSettleDelay(for: candidate, now: now) {
+                enqueue(candidate)
+                return .retryAfter(delay)
+            }
+
+            if isAlreadyConnectingOrConnected(candidate.peripheralID) {
+                continue
+            }
+
+            return .connect(candidate)
+        }
+
+        return .none
+    }
+
+    func recordConnectionAttempt(at now: Date) {
+        lastGlobalConnectAttempt = now
+    }
+
+    func recordConnectionSuccess(peripheralID: String) {
+        failureCounts[peripheralID] = 0
+        recentConnectTimeouts.removeValue(forKey: peripheralID)
+        recentDisconnects.removeValue(forKey: peripheralID)
+    }
+
+    func recordConnectionFailure(peripheralID: String) {
+        failureCounts[peripheralID, default: 0] += 1
+    }
+
+    func recordDisconnectError(peripheralID: String, at now: Date) {
+        recentDisconnects[peripheralID] = now
+    }
+
+    func recordConnectionTimeout(peripheralID: String, at now: Date) {
+        recentConnectTimeouts[peripheralID] = now
+        recordConnectionFailure(peripheralID: peripheralID)
+    }
+
+    func pruneConnectionTimeouts(before cutoff: Date) {
+        recentConnectTimeouts = recentConnectTimeouts.filter { $0.value >= cutoff }
+        recentDisconnects = recentDisconnects.filter { $0.value >= cutoff }
+    }
+
+    func reset() {
+        lastGlobalConnectAttempt = .distantPast
+        candidates.removeAll()
+        failureCounts.removeAll()
+        recentConnectTimeouts.removeAll()
+        recentDisconnects.removeAll()
+        lastIsolatedAt = nil
+        dynamicRSSIThreshold = initialDynamicRSSIThreshold
+    }
+
+    @discardableResult
+    func updateRSSIThreshold(
+        connectedCount: Int,
+        connectedOrConnectingLinkCount: Int,
+        now: Date
+    ) -> Int {
+        if connectedCount == 0 {
+            if lastIsolatedAt == nil { lastIsolatedAt = now }
+            let isolatedAt = lastIsolatedAt ?? now
+            let elapsed = now.timeIntervalSince(isolatedAt)
+            dynamicRSSIThreshold = elapsed > TransportConfig.bleIsolationRelaxThresholdSeconds
+                ? TransportConfig.bleRSSIIsolatedRelaxed
+                : TransportConfig.bleRSSIIsolatedBase
+            return dynamicRSSIThreshold
+        }
+
+        lastIsolatedAt = nil
+        // Flaky links are handled per-peripheral (weak-link cooldown, discovery
+        // ignore window, score bias) — never globally, so one flaky distant peer
+        // can't blind us to every other edge-of-range peer.
+        var threshold = TransportConfig.bleDynamicRSSIThresholdDefault
+        if connectedOrConnectingLinkCount >= maxCentralLinks || candidates.count >= candidateCap {
+            threshold = TransportConfig.bleRSSIConnectedThreshold
+        }
+
+        dynamicRSSIThreshold = threshold
+        return threshold
+    }
+
+    private func rateLimitRetryDelay(now: Date) -> TimeInterval? {
+        let elapsed = now.timeIntervalSince(lastGlobalConnectAttempt)
+        guard elapsed < connectRateLimitInterval else { return nil }
+        return connectRateLimitInterval - elapsed + 0.05
+    }
+
+    private func weakLinkRetryDelay(
+        for candidate: BLEConnectionCandidate<Peripheral>,
+        now: Date
+    ) -> TimeInterval? {
+        guard let lastTimeout = recentConnectTimeouts[candidate.peripheralID] else { return nil }
+        let elapsed = now.timeIntervalSince(lastTimeout)
+        guard elapsed < weakLinkCooldownSeconds && candidate.rssi <= weakLinkRSSICutoff else { return nil }
+        let remaining = weakLinkCooldownSeconds - elapsed
+        return min(max(2.0, remaining), 15.0)
+    }
+
+    // The disconnect settle window must hold on the queue path too: a stale
+    // candidate enqueued while the peripheral was still connected would
+    // otherwise reconnect immediately via the post-disconnect queue drain,
+    // bypassing the window and recreating reconnect/cancel thrash.
+    private func disconnectSettleDelay(
+        for candidate: BLEConnectionCandidate<Peripheral>,
+        now: Date
+    ) -> TimeInterval? {
+        guard let lastDisconnect = recentDisconnects[candidate.peripheralID] else { return nil }
+        let remaining = TransportConfig.bleDisconnectDiscoveryIgnoreSeconds - now.timeIntervalSince(lastDisconnect)
+        guard remaining > 0 else { return nil }
+        return remaining + 0.05
+    }
+
+    private func score(_ candidate: BLEConnectionCandidate<Peripheral>, now: Date) -> Int {
+        let failures = failureCounts[candidate.peripheralID] ?? 0
+        let penalty = min(20, 1 << min(4, failures))
+        let timeoutBias = recentConnectTimeouts[candidate.peripheralID].map {
+            now.timeIntervalSince($0) < 60 ? 10 : 0
+        } ?? 0
+        let base = (candidate.isConnectable ? 1000 : 0) + (candidate.rssi + 100) * 2
+        let recency = -Int(now.timeIntervalSince(candidate.discoveredAt) * 10)
+        return base + recency - penalty - timeoutBias
+    }
+}

bitchat/Services/BLE/BLEDirectedRelaySpool.swift

@@ -0,0 +1,71 @@
+import BitFoundation
+import Foundation
+
+struct BLEDirectedRelaySpoolEntry {
+    let recipient: PeerID
+    let packet: BitchatPacket
+}
+
+struct BLEDirectedRelaySpool {
+    private struct StoredPacket {
+        let packet: BitchatPacket
+        let enqueuedAt: Date
+    }
+
+    private var packetsByRecipient: [PeerID: [String: StoredPacket]] = [:]
+
+    var isEmpty: Bool {
+        packetsByRecipient.isEmpty
+    }
+
+    var count: Int {
+        packetsByRecipient.values.reduce(0) { $0 + $1.count }
+    }
+
+    @discardableResult
+    mutating func enqueue(
+        packet: BitchatPacket,
+        recipient: PeerID,
+        messageID: String,
+        enqueuedAt: Date
+    ) -> Bool {
+        var packets = packetsByRecipient[recipient] ?? [:]
+        guard packets[messageID] == nil else {
+            return false
+        }
+
+        packets[messageID] = StoredPacket(packet: packet, enqueuedAt: enqueuedAt)
+        packetsByRecipient[recipient] = packets
+        return true
+    }
+
+    mutating func drainUnexpired(now: Date, window: TimeInterval) -> [BLEDirectedRelaySpoolEntry] {
+        var entries: [BLEDirectedRelaySpoolEntry] = []
+
+        for (recipient, packets) in packetsByRecipient {
+            for stored in packets.values where now.timeIntervalSince(stored.enqueuedAt) <= window {
+                entries.append(BLEDirectedRelaySpoolEntry(recipient: recipient, packet: stored.packet))
+            }
+        }
+
+        packetsByRecipient.removeAll()
+        return entries
+    }
+
+    mutating func pruneExpired(now: Date, window: TimeInterval) {
+        guard !packetsByRecipient.isEmpty else { return }
+
+        var pruned: [PeerID: [String: StoredPacket]] = [:]
+        for (recipient, packets) in packetsByRecipient {
+            let freshPackets = packets.filter { now.timeIntervalSince($0.value.enqueuedAt) <= window }
+            if !freshPackets.isEmpty {
+                pruned[recipient] = freshPackets
+            }
+        }
+        packetsByRecipient = pruned
+    }
+
+    mutating func removeAll() {
+        packetsByRecipient.removeAll()
+    }
+}

bitchat/Services/BLE/BLEFanoutSelector.swift

@@ -0,0 +1,152 @@
+import BitFoundation
+import CryptoKit
+import Foundation
+
+struct BLEFanoutSelection: Equatable {
+    let peripheralIDs: Set<String>
+    let centralIDs: Set<String>
+}
+
+enum BLEFanoutSelector {
+    static func selectLinks(
+        peripheralIDs: [String],
+        centralIDs: [String],
+        ingressLink: BLEIngressLinkID?,
+        excludedLinks: Set<BLEIngressLinkID> = [],
+        peripheralPeerBindings: [String: PeerID] = [:],
+        centralPeerBindings: [String: PeerID] = [:],
+        directedPeerHint: PeerID?,
+        packetType: UInt8,
+        messageID: String
+    ) -> BLEFanoutSelection {
+        let allowed = collapseDuplicateLinksPerPeer(
+            allowedLinks(
+                peripheralIDs: peripheralIDs,
+                centralIDs: centralIDs,
+                ingressLink: ingressLink,
+                excludedLinks: excludedLinks
+            ),
+            peripheralPeerBindings: peripheralPeerBindings,
+            centralPeerBindings: centralPeerBindings
+        )
+
+        guard shouldSubset(packetType: packetType, directedPeerHint: directedPeerHint) else {
+            return BLEFanoutSelection(
+                peripheralIDs: Set(allowed.peripheralIDs),
+                centralIDs: Set(allowed.centralIDs)
+            )
+        }
+
+        return BLEFanoutSelection(
+            peripheralIDs: deterministicSubset(
+                ids: allowed.peripheralIDs,
+                k: subsetSize(for: allowed.peripheralIDs.count),
+                seed: messageID
+            ),
+            centralIDs: deterministicSubset(
+                ids: allowed.centralIDs,
+                k: subsetSize(for: allowed.centralIDs.count),
+                seed: messageID
+            )
+        )
+    }
+
+    private static func allowedLinks(
+        peripheralIDs: [String],
+        centralIDs: [String],
+        ingressLink: BLEIngressLinkID?,
+        excludedLinks: Set<BLEIngressLinkID>
+    ) -> (peripheralIDs: [String], centralIDs: [String]) {
+        var allowedPeripheralIDs = peripheralIDs
+        var allowedCentralIDs = centralIDs
+        var blockedLinks = excludedLinks
+
+        if let ingressLink {
+            blockedLinks.insert(ingressLink)
+        }
+
+        allowedPeripheralIDs.removeAll { blockedLinks.contains(.peripheral($0)) }
+        allowedCentralIDs.removeAll { blockedLinks.contains(.central($0)) }
+
+        return (allowedPeripheralIDs, allowedCentralIDs)
+    }
+
+    // Dual-role pairs hold two live links (we-as-central writing to their
+    // peripheral, and they-as-central subscribed to ours). Sending the same
+    // packet down both doubles airtime for nothing — the receiver's assembler
+    // and deduplicator just discard the copy. Keep one link per bound peer,
+    // preferring the peripheral (write) side: it has per-link flow control
+    // via canSendWriteWithoutResponse, while notifications share the
+    // peripheral manager's update queue across all centrals. Links with no
+    // bound peer yet (pre-announce) pass through untouched.
+    private static func collapseDuplicateLinksPerPeer(
+        _ links: (peripheralIDs: [String], centralIDs: [String]),
+        peripheralPeerBindings: [String: PeerID],
+        centralPeerBindings: [String: PeerID]
+    ) -> (peripheralIDs: [String], centralIDs: [String]) {
+        guard !peripheralPeerBindings.isEmpty || !centralPeerBindings.isEmpty else {
+            return links
+        }
+
+        var seenPeers = Set<PeerID>()
+        var keptPeripheralIDs: [String] = []
+        for id in links.peripheralIDs {
+            if let peer = peripheralPeerBindings[id], !seenPeers.insert(peer).inserted {
+                continue
+            }
+            keptPeripheralIDs.append(id)
+        }
+
+        var keptCentralIDs: [String] = []
+        for id in links.centralIDs {
+            if let peer = centralPeerBindings[id], !seenPeers.insert(peer).inserted {
+                continue
+            }
+            keptCentralIDs.append(id)
+        }
+
+        return (keptPeripheralIDs, keptCentralIDs)
+    }
+
+    private static func shouldSubset(packetType: UInt8, directedPeerHint: PeerID?) -> Bool {
+        directedPeerHint == nil
+            && packetType != MessageType.fragment.rawValue
+            && packetType != MessageType.announce.rawValue
+            && packetType != MessageType.requestSync.rawValue
+    }
+
+    private static func subsetSize(for count: Int) -> Int {
+        guard count > 0 else { return 0 }
+        if count <= 2 { return count }
+
+        var value = count - 1
+        var bits = 0
+        while value > 0 {
+            value >>= 1
+            bits += 1
+        }
+        return min(count, max(1, bits + 1))
+    }
+
+    private static func deterministicSubset(ids: [String], k: Int, seed: String) -> Set<String> {
+        guard k > 0 && ids.count > k else { return Set(ids) }
+
+        var scored: [(score: [UInt8], id: String)] = []
+        for id in ids {
+            let data = (seed + "::" + id).data(using: .utf8) ?? Data()
+            let digest = Array(SHA256.hash(data: data))
+            scored.append((digest, id))
+        }
+
+        scored.sort { lhs, rhs in
+            for index in 0..<min(lhs.score.count, rhs.score.count) {
+                if lhs.score[index] != rhs.score[index] {
+                    return lhs.score[index] < rhs.score[index]
+                }
+            }
+            return lhs.id < rhs.id
+        }
+
+        return Set(scored.prefix(k).map(\.id))
+    }
+}

bitchat/Services/BLE/BLEFileTransferHandler.swift

@@ -0,0 +1,123 @@
+import BitFoundation
+import BitLogger
+import Foundation
+
+/// Narrow environment for `BLEFileTransferHandler`.
+///
+/// All queue hops (collections registry reads/writes, main-actor UI
+/// notification) live inside the closures supplied by `BLEService`, keeping
+/// the handler queue-agnostic and synchronously testable.
+struct BLEFileTransferHandlerEnvironment {
+    /// Local peer identity at the time the transfer is handled.
+    let localPeerID: () -> PeerID
+    /// Local nickname used for sender resolution and collision checks.
+    let localNickname: () -> String
+    /// Snapshot of known peers keyed by ID (registry read).
+    let peersSnapshot: () -> [PeerID: BLEPeerInfo]
+    /// Resolves a display name from a verified packet signature for peers missing from the registry.
+    let signedSenderDisplayName: (_ packet: BitchatPacket, _ peerID: PeerID) -> String?
+    /// Tracks the broadcast file packet for gossip sync.
+    let trackPacketSeen: (BitchatPacket) -> Void
+    /// Enforces the incoming-media storage quota before saving (BCH-01-002).
+    let enforceStorageQuota: (_ reservingBytes: Int) -> Void
+    /// Persists the validated file to the incoming-media store; returns the destination URL.
+    let saveIncomingFile: (
+        _ data: Data,
+        _ preferredName: String?,
+        _ subdirectory: String,
+        _ fallbackExtension: String?,
+        _ defaultPrefix: String
+    ) -> URL?
+    /// Updates the registry last-seen timestamp for the peer (async barrier write).
+    let updatePeerLastSeen: (PeerID) -> Void
+    /// Delivers `.messageReceived` to the UI as one main-actor hop.
+    let deliverMessage: (BitchatMessage) -> Void
+}
+
+/// Orchestrates inbound file transfers: self-echo policy, sender display-name
+/// resolution, delivery planning, payload validation, quota-checked storage,
+/// and UI delivery.
+final class BLEFileTransferHandler {
+    private let environment: BLEFileTransferHandlerEnvironment
+
+    init(environment: BLEFileTransferHandlerEnvironment) {
+        self.environment = environment
+    }
+
+    func handle(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        if BLEFileTransferPolicy.isSelfEcho(packet: packet, from: peerID, localPeerID: env.localPeerID()) { return }
+
+        let peersSnapshot = env.peersSnapshot()
+        guard let senderNickname = BLEPeerSenderDisplayName.resolveKnownPeer(
+            peerID: peerID,
+            localPeerID: env.localPeerID(),
+            localNickname: env.localNickname(),
+            peers: peersSnapshot,
+            allowConnectedUnverified: true
+        ) ?? env.signedSenderDisplayName(packet, peerID) else {
+            SecureLogger.warning("🚫 Dropping file transfer from unverified or unknown peer \(peerID.id.prefix(8))…", category: .security)
+            return
+        }
+
+        guard let deliveryPlan = BLEFileTransferPolicy.deliveryPlan(packet: packet, localPeerID: env.localPeerID()) else {
+            return
+        }
+        if deliveryPlan.shouldTrackForSync {
+            env.trackPacketSeen(packet)
+        }
+
+        let filePacket: BitchatFilePacket
+        let mime: MimeType
+        switch BLEIncomingFileValidator.validate(payload: packet.payload) {
+        case .success(let acceptance):
+            filePacket = acceptance.filePacket
+            mime = acceptance.mime
+        case .failure(.malformedPayload):
+            SecureLogger.error("❌ Failed to decode file transfer payload", category: .session)
+            return
+        case .failure(.payloadTooLarge(let bytes)):
+            SecureLogger.warning("🚫 Dropping file transfer exceeding size cap (\(bytes) bytes)", category: .security)
+            return
+        case .failure(.unsupportedMime(let mimeType, let bytes)):
+            SecureLogger.warning("🚫 MIME REJECT: '\(mimeType ?? "<empty>")' not supported. Size=\(bytes)b from \(peerID.id.prefix(8))...", category: .security)
+            return
+        case .failure(.magicMismatch(let mime, let bytes, let prefixHex)):
+            SecureLogger.warning("🚫 MAGIC REJECT: MIME='\(mime)' size=\(bytes)b prefix=[\(prefixHex)] from \(peerID.id.prefix(8))...", category: .security)
+            return
+        }
+
+        // BCH-01-002: Enforce storage quota before saving
+        env.enforceStorageQuota(filePacket.content.count)
+
+        guard let destination = env.saveIncomingFile(
+            filePacket.content,
+            filePacket.fileName,
+            "\(mime.category.mediaDir)/incoming",
+            mime.defaultExtension,
+            mime.category.rawValue
+        ) else {
+            return
+        }
+
+        if deliveryPlan.isPrivateMessage {
+            env.updatePeerLastSeen(peerID)
+        }
+
+        let ts = Date(timeIntervalSince1970: Double(packet.timestamp) / 1000)
+        let message = BitchatMessage(
+            sender: senderNickname,
+            content: "\(mime.category.messagePrefix)\(destination.lastPathComponent)",
+            timestamp: ts,
+            isRelay: false,
+            originalSender: nil,
+            isPrivate: deliveryPlan.isPrivateMessage,
+            recipientNickname: nil,
+            senderPeerID: peerID
+        )
+
+        SecureLogger.debug("📁 Stored incoming media from \(peerID.id.prefix(8))… -> \(destination.lastPathComponent)", category: .session)
+
+        env.deliverMessage(message)
+    }
+}

bitchat/Services/BLE/BLEFileTransferPolicy.swift

@@ -0,0 +1,71 @@
+import BitFoundation
+import Foundation
+
+struct BLEFileTransferDeliveryPlan: Equatable {
+    let isPrivateMessage: Bool
+    let shouldTrackForSync: Bool
+}
+
+enum BLEFileTransferPolicy {
+    static func isSelfEcho(packet: BitchatPacket, from peerID: PeerID, localPeerID: PeerID) -> Bool {
+        peerID == localPeerID && packet.ttl != 0
+    }
+
+    static func deliveryPlan(packet: BitchatPacket, localPeerID: PeerID) -> BLEFileTransferDeliveryPlan? {
+        guard let recipientID = packet.recipientID else {
+            return BLEFileTransferDeliveryPlan(isPrivateMessage: false, shouldTrackForSync: true)
+        }
+
+        let isBroadcast = recipientID.allSatisfy { $0 == 0xFF }
+        if isBroadcast {
+            return BLEFileTransferDeliveryPlan(isPrivateMessage: false, shouldTrackForSync: true)
+        }
+
+        guard PeerID(hexData: recipientID) == localPeerID else {
+            return nil
+        }
+
+        return BLEFileTransferDeliveryPlan(isPrivateMessage: true, shouldTrackForSync: false)
+    }
+}
+
+struct BLEIncomingFileAcceptance {
+    let filePacket: BitchatFilePacket
+    let mime: MimeType
+}
+
+enum BLEIncomingFileRejection: Error, Equatable {
+    case malformedPayload
+    case payloadTooLarge(bytes: Int)
+    case unsupportedMime(mimeType: String?, bytes: Int)
+    case magicMismatch(mime: MimeType, bytes: Int, prefixHex: String)
+}
+
+enum BLEIncomingFileValidator {
+    static func validate(payload: Data) -> Result<BLEIncomingFileAcceptance, BLEIncomingFileRejection> {
+        guard let filePacket = BitchatFilePacket.decode(payload) else {
+            return .failure(.malformedPayload)
+        }
+
+        guard FileTransferLimits.isValidPayload(filePacket.content.count) else {
+            return .failure(.payloadTooLarge(bytes: filePacket.content.count))
+        }
+
+        guard let mime = MimeType(filePacket.mimeType), mime.isAllowed else {
+            return .failure(.unsupportedMime(
+                mimeType: filePacket.mimeType,
+                bytes: filePacket.content.count
+            ))
+        }
+
+        guard mime.matches(data: filePacket.content) else {
+            return .failure(.magicMismatch(
+                mime: mime,
+                bytes: filePacket.content.count,
+                prefixHex: filePacket.content.prefix(20).map { String(format: "%02x", $0) }.joined(separator: " ")
+            ))
+        }
+
+        return .success(BLEIncomingFileAcceptance(filePacket: filePacket, mime: mime))
+    }
+}

bitchat/Services/BLE/BLEFragmentAssemblyBuffer.swift

@@ -0,0 +1,153 @@
+import BitFoundation
+import Foundation
+
+struct BLEFragmentKey: Hashable, Equatable {
+    let sender: UInt64
+    let id: UInt64
+}
+
+struct BLEFragmentHeader: Equatable {
+    let key: BLEFragmentKey
+    let index: Int
+    let total: Int
+    let originalType: UInt8
+    let fragmentData: Data
+    let isBroadcastFragment: Bool
+
+    var idLogString: String {
+        String(format: "%016llx", key.id)
+    }
+
+    init?(packet: BitchatPacket) {
+        // Minimum header: 8 bytes ID + 2 index + 2 total + 1 type.
+        guard packet.payload.count >= 13 else { return nil }
+
+        var senderU64: UInt64 = 0
+        for byte in packet.senderID.prefix(8) {
+            senderU64 = (senderU64 << 8) | UInt64(byte)
+        }
+
+        var fragmentU64: UInt64 = 0
+        for byte in packet.payload.prefix(8) {
+            fragmentU64 = (fragmentU64 << 8) | UInt64(byte)
+        }
+
+        let index = Int((UInt16(packet.payload[8]) << 8) | UInt16(packet.payload[9]))
+        let total = Int((UInt16(packet.payload[10]) << 8) | UInt16(packet.payload[11]))
+
+        guard total > 0 && total <= 10_000 && index >= 0 && index < total else {
+            return nil
+        }
+
+        let isBroadcastFragment: Bool = {
+            guard let recipient = packet.recipientID else { return true }
+            return recipient.count == 8 && recipient.allSatisfy { $0 == 0xFF }
+        }()
+
+        self.key = BLEFragmentKey(sender: senderU64, id: fragmentU64)
+        self.index = index
+        self.total = total
+        self.originalType = packet.payload[12]
+        self.fragmentData = Data(packet.payload.suffix(from: 13))
+        self.isBroadcastFragment = isBroadcastFragment
+    }
+}
+
+struct BLEFragmentAssemblyBuffer {
+    enum AppendResult: Equatable {
+        case stored(header: BLEFragmentHeader, started: Bool)
+        case complete(header: BLEFragmentHeader, reassembledData: Data, started: Bool)
+        case oversized(header: BLEFragmentHeader, projectedSize: Int, limit: Int, started: Bool)
+    }
+
+    private struct Metadata {
+        let type: UInt8
+        let total: Int
+        let timestamp: Date
+    }
+
+    private var fragmentsByKey: [BLEFragmentKey: [Int: Data]] = [:]
+    private var metadataByKey: [BLEFragmentKey: Metadata] = [:]
+
+    mutating func removeAll() {
+        fragmentsByKey.removeAll()
+        metadataByKey.removeAll()
+    }
+
+    @discardableResult
+    mutating func removeExpired(before cutoff: Date) -> Int {
+        let expiredKeys = metadataByKey
+            .filter { $0.value.timestamp < cutoff }
+            .map(\.key)
+
+        for key in expiredKeys {
+            fragmentsByKey.removeValue(forKey: key)
+            metadataByKey.removeValue(forKey: key)
+        }
+
+        return expiredKeys.count
+    }
+
+    mutating func append(
+        _ header: BLEFragmentHeader,
+        maxInFlightAssemblies: Int,
+        now: Date = Date()
+    ) -> AppendResult {
+        let started = startAssemblyIfNeeded(for: header, maxInFlightAssemblies: maxInFlightAssemblies, now: now)
+
+        let currentSize = fragmentsByKey[header.key]?.values.reduce(0) { $0 + $1.count } ?? 0
+        let limit = Self.assemblyLimit(for: header.originalType)
+        let projectedSize = currentSize + header.fragmentData.count
+
+        guard projectedSize <= limit else {
+            fragmentsByKey.removeValue(forKey: header.key)
+            metadataByKey.removeValue(forKey: header.key)
+            return .oversized(header: header, projectedSize: projectedSize, limit: limit, started: started)
+        }
+
+        fragmentsByKey[header.key]?[header.index] = header.fragmentData
+
+        guard let fragments = fragmentsByKey[header.key],
+              fragments.count == header.total else {
+            return .stored(header: header, started: started)
+        }
+
+        let reassembled = (0..<header.total).reduce(into: Data()) { data, index in
+            if let fragment = fragments[index] {
+                data.append(fragment)
+            }
+        }
+
+        fragmentsByKey.removeValue(forKey: header.key)
+        metadataByKey.removeValue(forKey: header.key)
+
+        return .complete(header: header, reassembledData: reassembled, started: started)
+    }
+
+    private mutating func startAssemblyIfNeeded(
+        for header: BLEFragmentHeader,
+        maxInFlightAssemblies: Int,
+        now: Date
+    ) -> Bool {
+        guard fragmentsByKey[header.key] == nil else { return false }
+
+        if fragmentsByKey.count >= maxInFlightAssemblies,
+           let oldest = metadataByKey.min(by: { $0.value.timestamp < $1.value.timestamp })?.key {
+            fragmentsByKey.removeValue(forKey: oldest)
+            metadataByKey.removeValue(forKey: oldest)
+        }
+
+        fragmentsByKey[header.key] = [:]
+        metadataByKey[header.key] = Metadata(type: header.originalType, total: header.total, timestamp: now)
+        return true
+    }
+
+    private static func assemblyLimit(for originalType: UInt8) -> Int {
+        if originalType == MessageType.fileTransfer.rawValue {
+            // Allow headroom for TLV metadata and binary framing overhead.
+            return FileTransferLimits.maxFramedFileBytes
+        }
+
+        return FileTransferLimits.maxPayloadBytes
+    }
+}

bitchat/Services/BLE/BLEFragmentHandler.swift

@@ -0,0 +1,94 @@
+import BitFoundation
+import BitLogger
+import Foundation
+
+/// Narrow environment for `BLEFragmentHandler`.
+///
+/// All queue hops (the message-queue entry hop and the collections barrier
+/// around the assembly buffer) live on the `BLEService` side — the entry hop
+/// in `BLEService.handleFragment`, the barrier inside the supplied closures —
+/// keeping the handler queue-agnostic and synchronously testable.
+struct BLEFragmentHandlerEnvironment {
+    /// Local peer identity at the time the fragment is handled.
+    let localPeerID: () -> PeerID
+    /// Tracks broadcast fragments for gossip sync.
+    let trackPacketSeen: (BitchatPacket) -> Void
+    /// Appends the fragment to the assembly buffer (collections barrier write).
+    let appendFragment: (BLEFragmentHeader) -> BLEFragmentAssemblyBuffer.AppendResult
+    /// Ingress acceptance check for the reassembled inner packet.
+    let isAcceptedIngressPayload: (_ packet: BitchatPacket, _ innerSender: PeerID) -> Bool
+    /// Re-enters the receive pipeline with the reassembled packet (TTL already zeroed).
+    let processReassembledPacket: (_ packet: BitchatPacket, _ from: PeerID) -> Void
+}
+
+/// Orchestrates inbound fragments: self-fragment suppression, gossip tracking,
+/// assembly-buffer appends, and reassembled-packet validation and re-injection
+/// into the receive pipeline.
+final class BLEFragmentHandler {
+    private let environment: BLEFragmentHandlerEnvironment
+
+    init(environment: BLEFragmentHandlerEnvironment) {
+        self.environment = environment
+    }
+
+    func handle(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        // Don't process our own fragments
+        if peerID == env.localPeerID() {
+            return
+        }
+
+        guard let header = BLEFragmentHeader(packet: packet) else { return }
+
+        if header.isBroadcastFragment {
+            env.trackPacketSeen(packet)
+        }
+
+        let assemblyResult = env.appendFragment(header)
+
+        logFragmentAssemblyResult(assemblyResult)
+
+        guard case let .complete(completedHeader, reassembled, _) = assemblyResult else { return }
+
+        // Decode the original packet bytes we reassembled, so flags/compression are preserved
+        if var originalPacket = BinaryProtocol.decode(reassembled) {
+
+            // Reassembled packet validation
+            let innerSender = PeerID(hexData: originalPacket.senderID)
+            if !env.isAcceptedIngressPayload(originalPacket, innerSender) {
+                // Cleanup below
+            } else {
+                SecureLogger.debug("✅ Reassembled packet id=\(completedHeader.idLogString) type=\(originalPacket.type) bytes=\(reassembled.count)", category: .session)
+                originalPacket.ttl = 0
+                env.processReassembledPacket(originalPacket, peerID)
+            }
+        } else {
+            SecureLogger.error("❌ Failed to decode reassembled packet (type=\(completedHeader.originalType), total=\(completedHeader.total))", category: .session)
+        }
+    }
+
+    private func logFragmentAssemblyResult(_ result: BLEFragmentAssemblyBuffer.AppendResult) {
+        func logStartedIfNeeded(header: BLEFragmentHeader, started: Bool) {
+            if started {
+                SecureLogger.debug("📦 Started fragment assembly id=\(header.idLogString) total=\(header.total)", category: .session)
+            }
+        }
+
+        switch result {
+        case let .stored(header, started):
+            logStartedIfNeeded(header: header, started: started)
+            SecureLogger.debug("📦 Fragment \(header.index + 1)/\(header.total) (len=\(header.fragmentData.count)) for id=\(header.idLogString)", category: .session)
+
+        case let .complete(header, _, started):
+            logStartedIfNeeded(header: header, started: started)
+            SecureLogger.debug("📦 Fragment \(header.index + 1)/\(header.total) (len=\(header.fragmentData.count)) for id=\(header.idLogString)", category: .session)
+
+        case let .oversized(header, projectedSize, limit, started):
+            logStartedIfNeeded(header: header, started: started)
+            SecureLogger.warning(
+                "🚫 Fragment assembly exceeds size limit (\(projectedSize) bytes > \(limit)), evicting. Type=\(header.originalType) Index=\(header.index)/\(header.total)",
+                category: .security
+            )
+        }
+    }
+}

bitchat/Services/BLE/BLEInboundWriteBuffer.swift

@@ -0,0 +1,70 @@
+import BitFoundation
+import Foundation
+
+struct BLEInboundWriteChunk: Equatable {
+    let offset: Int
+    let data: Data
+}
+
+struct BLEInboundWriteAppendMetadata: Equatable {
+    let accumulatedBytes: Int
+    let appendedBytes: Int
+    let offsets: [Int]
+    let packetType: UInt8?
+}
+
+struct BLEInboundWriteBuffer {
+    enum AppendResult {
+        case decoded(packet: BitchatPacket, metadata: BLEInboundWriteAppendMetadata)
+        case waiting(metadata: BLEInboundWriteAppendMetadata)
+        case oversized(metadata: BLEInboundWriteAppendMetadata)
+    }
+
+    private var buffersByCentralID: [String: Data] = [:]
+
+    mutating func removeAll() {
+        buffersByCentralID.removeAll()
+    }
+
+    mutating func append(
+        chunks: [BLEInboundWriteChunk],
+        for centralID: String,
+        capBytes: Int
+    ) -> AppendResult {
+        var combined = buffersByCentralID[centralID] ?? Data()
+        var appendedBytes = 0
+        var offsets: [Int] = []
+
+        for chunk in chunks where !chunk.data.isEmpty {
+            offsets.append(chunk.offset)
+            let end = chunk.offset + chunk.data.count
+
+            if combined.count < end {
+                combined.append(Data(repeating: 0, count: end - combined.count))
+            }
+
+            combined.replaceSubrange(chunk.offset..<end, with: chunk.data)
+            appendedBytes += chunk.data.count
+        }
+
+        let metadata = BLEInboundWriteAppendMetadata(
+            accumulatedBytes: combined.count,
+            appendedBytes: appendedBytes,
+            offsets: offsets,
+            packetType: combined.count >= 2 ? combined[1] : nil
+        )
+
+        if let packet = BinaryProtocol.decode(combined) {
+            buffersByCentralID.removeValue(forKey: centralID)
+            return .decoded(packet: packet, metadata: metadata)
+        }
+
+        guard combined.count <= capBytes else {
+            buffersByCentralID.removeValue(forKey: centralID)
+            return .oversized(metadata: metadata)
+        }
+
+        buffersByCentralID[centralID] = combined
+        return .waiting(metadata: metadata)
+    }
+}

bitchat/Services/BLE/BLEIncomingFileStore.swift

@@ -0,0 +1,168 @@
+import BitLogger
+import BitFoundation
+import Foundation
+
+struct BLEIncomingFileStore {
+    private static let quotaBytes: Int64 = 100 * 1024 * 1024
+
+    private let fileManager: FileManager
+    private let baseDirectory: URL?
+    private let dateProvider: () -> Date
+
+    init(fileManager: FileManager = .default, baseDirectory: URL? = nil, dateProvider: @escaping () -> Date = Date.init) {
+        self.fileManager = fileManager
+        self.baseDirectory = baseDirectory
+        self.dateProvider = dateProvider
+    }
+
+    func save(
+        data: Data,
+        preferredName: String?,
+        subdirectory: String,
+        fallbackExtension: String?,
+        defaultPrefix: String
+    ) -> URL? {
+        do {
+            let base = try filesDirectory().appendingPathComponent(subdirectory, isDirectory: true)
+            try fileManager.createDirectory(at: base, withIntermediateDirectories: true, attributes: nil)
+            let sanitized = sanitizedFileName(
+                preferredName,
+                defaultName: "\(defaultPrefix)_\(Self.timestampString(from: dateProvider()))",
+                fallbackExtension: fallbackExtension
+            )
+            let destination = uniqueFileURL(in: base, fileName: sanitized)
+            try data.write(to: destination, options: .atomic)
+            return destination
+        } catch {
+            SecureLogger.error("❌ Failed to persist incoming media: \(error)", category: .session)
+            return nil
+        }
+    }
+
+    func enforceQuota(reservingBytes: Int) {
+        do {
+            let base = try filesDirectory()
+            let incomingDirs = [
+                base.appendingPathComponent("voicenotes/incoming", isDirectory: true),
+                base.appendingPathComponent("images/incoming", isDirectory: true),
+                base.appendingPathComponent("files/incoming", isDirectory: true)
+            ]
+            var allFiles: [(url: URL, size: Int64, modified: Date)] = []
+
+            for dir in incomingDirs where fileManager.fileExists(atPath: dir.path) {
+                guard let contents = try? fileManager.contentsOfDirectory(
+                    at: dir,
+                    includingPropertiesForKeys: [.fileSizeKey, .contentModificationDateKey],
+                    options: [.skipsHiddenFiles]
+                ) else { continue }
+
+                for fileURL in contents {
+                    guard let attrs = try? fileURL.resourceValues(forKeys: [.fileSizeKey, .contentModificationDateKey]),
+                          let size = attrs.fileSize,
+                          let modified = attrs.contentModificationDate else { continue }
+                    allFiles.append((url: fileURL, size: Int64(size), modified: modified))
+                }
+            }
+
+            let currentUsage = allFiles.reduce(0) { $0 + $1.size }
+            let targetUsage = Self.quotaBytes - Int64(reservingBytes)
+            guard currentUsage > targetUsage else { return }
+
+            let needToFree = currentUsage - targetUsage
+            var freedSpace: Int64 = 0
+            for file in allFiles.sorted(by: { $0.modified < $1.modified }) {
+                guard freedSpace < needToFree else { break }
+                do {
+                    try fileManager.removeItem(at: file.url)
+                    freedSpace += file.size
+                    SecureLogger.debug("🗑️ BCH-01-002: Deleted old incoming file to free space: \(file.url.lastPathComponent)", category: .security)
+                } catch {
+                    SecureLogger.warning("⚠️ Failed to delete old file for quota: \(error)", category: .security)
+                }
+            }
+
+            if freedSpace > 0 {
+                SecureLogger.info("📊 BCH-01-002: Freed \(ByteCountFormatter.string(fromByteCount: freedSpace, countStyle: .file)) to stay within incoming files quota", category: .security)
+            }
+        } catch {
+            SecureLogger.warning("⚠️ Could not enforce storage quota: \(error)", category: .security)
+        }
+    }
+
+    private func filesDirectory() throws -> URL {
+        let root = try baseDirectory ?? fileManager.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: true
+        )
+        let filesDir = root.appendingPathComponent("files", isDirectory: true)
+        try fileManager.createDirectory(at: filesDir, withIntermediateDirectories: true, attributes: nil)
+        return filesDir
+    }
+
+    private func sanitizedFileName(_ name: String?, defaultName: String, fallbackExtension: String?) -> String {
+        var candidate = (name ?? "")
+            .replacingOccurrences(of: "\0", with: "")
+            .precomposedStringWithCanonicalMapping
+            .replacingOccurrences(of: "/", with: "_")
+            .replacingOccurrences(of: "\\", with: "_")
+
+        let invalid = CharacterSet(charactersIn: "<>:\"|?*\0").union(.controlCharacters)
+        candidate = candidate.components(separatedBy: invalid).joined(separator: "_").trimmed
+        if candidate.isEmpty { candidate = defaultName }
+        if candidate.hasPrefix(".") { candidate = "_" + candidate }
+
+        if candidate.count > 120 {
+            let ext = (candidate as NSString).pathExtension
+            let base = (candidate as NSString).deletingPathExtension
+            candidate = ext.isEmpty
+                ? String(candidate.prefix(120))
+                : String(base.prefix(max(10, 120 - ext.count - 1))) + "." + ext
+        }
+
+        if let fallbackExtension, (candidate as NSString).pathExtension.isEmpty {
+            candidate += ".\(fallbackExtension)"
+        }
+
+        return candidate.isEmpty ? defaultName : candidate
+    }
+
+    private func uniqueFileURL(in directory: URL, fileName: String) -> URL {
+        let directoryPath = directory.standardizedFileURL.path
+        func isInsideDirectory(_ url: URL) -> Bool {
+            url.standardizedFileURL.path.hasPrefix(directoryPath + "/")
+        }
+
+        var candidate = directory.appendingPathComponent(fileName)
+        guard isInsideDirectory(candidate) else {
+            SecureLogger.warning("⚠️ Path traversal blocked: \(fileName)", category: .security)
+            return directory.appendingPathComponent("blocked_\(UUID().uuidString)")
+        }
+
+        if !fileManager.fileExists(atPath: candidate.path) {
+            return candidate
+        }
+
+        let baseName = (fileName as NSString).deletingPathExtension
+        let ext = (fileName as NSString).pathExtension
+        for counter in 1..<100 {
+            let newName = ext.isEmpty ? "\(baseName) (\(counter))" : "\(baseName) (\(counter)).\(ext)"
+            candidate = directory.appendingPathComponent(newName)
+            guard isInsideDirectory(candidate) else {
+                return directory.appendingPathComponent("blocked_\(UUID().uuidString)")
+            }
+            if !fileManager.fileExists(atPath: candidate.path) {
+                return candidate
+            }
+        }
+
+        return directory.appendingPathComponent("\(baseName)_\(UUID().uuidString).\(ext.isEmpty ? "dat" : ext)")
+    }
+
+    private static func timestampString(from date: Date) -> String {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyyMMdd_HHmmss"
+        return formatter.string(from: date)
+    }
+}

bitchat/Services/BLE/BLEIngressLinkRegistry.swift

@@ -0,0 +1,108 @@
+import BitFoundation
+import Foundation
+
+enum BLEIngressLinkID: Hashable, Equatable {
+    case peripheral(String)
+    case central(String)
+}
+
+struct BLEIngressPacketContext: Equatable {
+    let receivedFromPeerID: PeerID
+    let validationPeerID: PeerID
+}
+
+struct BLEIngressLinkRecord: Equatable {
+    let link: BLEIngressLinkID
+    let peerID: PeerID
+    let timestamp: Date
+}
+
+enum BLEIngressRejection: Error, Equatable {
+    case selfLoopback(packetType: UInt8)
+    case directSenderMismatch(boundPeerID: PeerID, claimedSenderID: PeerID)
+}
+
+struct BLEIngressLinkRegistry {
+    private var ingressByMessageID: [String: BLEIngressLinkRecord] = [:]
+
+    var isEmpty: Bool {
+        ingressByMessageID.isEmpty
+    }
+
+    mutating func removeAll() {
+        ingressByMessageID.removeAll()
+    }
+
+    func record(for packet: BitchatPacket) -> BLEIngressLinkRecord? {
+        ingressByMessageID[Self.messageID(for: packet)]
+    }
+
+    func link(for packet: BitchatPacket) -> BLEIngressLinkID? {
+        record(for: packet)?.link
+    }
+
+    func peerID(for packet: BitchatPacket) -> PeerID? {
+        record(for: packet)?.peerID
+    }
+
+    mutating func recordIfNew(
+        _ packet: BitchatPacket,
+        link: BLEIngressLinkID,
+        peerID: PeerID,
+        now: Date = Date(),
+        lifetime: TimeInterval
+    ) -> Bool {
+        let messageID = Self.messageID(for: packet)
+        if let existing = ingressByMessageID[messageID],
+           now.timeIntervalSince(existing.timestamp) <= lifetime {
+            return false
+        }
+
+        ingressByMessageID[messageID] = BLEIngressLinkRecord(link: link, peerID: peerID, timestamp: now)
+        return true
+    }
+
+    mutating func prune(before cutoff: Date) {
+        ingressByMessageID = ingressByMessageID.filter { $0.value.timestamp >= cutoff }
+    }
+
+    static func packetContext(
+        for packet: BitchatPacket,
+        claimedSenderID: PeerID,
+        boundPeerID: PeerID?,
+        localPeerID: PeerID,
+        directAnnounceTTL: UInt8
+    ) -> Result<BLEIngressPacketContext, BLEIngressRejection> {
+        if claimedSenderID == localPeerID,
+           !isSelfAuthoredSyncResponse(packet) {
+            return .failure(.selfLoopback(packetType: packet.type))
+        }
+
+        if let boundPeerID,
+           boundPeerID != claimedSenderID,
+           requiresDirectSenderBinding(packet, directAnnounceTTL: directAnnounceTTL) {
+            return .failure(.directSenderMismatch(boundPeerID: boundPeerID, claimedSenderID: claimedSenderID))
+        }
+
+        let receivedFromPeerID = boundPeerID ?? claimedSenderID
+        let validationPeerID = packet.isRSR ? receivedFromPeerID : claimedSenderID
+        return .success(BLEIngressPacketContext(
+            receivedFromPeerID: receivedFromPeerID,
+            validationPeerID: validationPeerID
+        ))
+    }
+
+    static func messageID(for packet: BitchatPacket) -> String {
+        let senderID = packet.senderID.hexEncodedString()
+        let digestPrefix = packet.payload.sha256Hash().prefix(4).hexEncodedString()
+        return "\(senderID)-\(packet.timestamp)-\(packet.type)-\(digestPrefix)"
+    }
+
+    private static func requiresDirectSenderBinding(_ packet: BitchatPacket, directAnnounceTTL: UInt8) -> Bool {
+        packet.type == MessageType.announce.rawValue && packet.ttl == directAnnounceTTL
+    }
+
+    private static func isSelfAuthoredSyncResponse(_ packet: BitchatPacket) -> Bool {
+        packet.isRSR && packet.ttl == 0
+    }
+}

bitchat/Services/BLE/BLEIngressPacketGuard.swift

@@ -0,0 +1,76 @@
+import BitFoundation
+import Foundation
+
+enum BLEIngressPacketGuard {
+    enum Rejection: Error, Equatable {
+        case selfLoopback(packetType: UInt8)
+        case directSenderMismatch(boundPeerID: PeerID, claimedSenderID: PeerID)
+        case invalidRSR(peerID: PeerID)
+        case timestampSkew(peerID: PeerID, skewMs: UInt64, maxSkewMs: UInt64)
+    }
+
+    static func evaluate(
+        packet: BitchatPacket,
+        claimedSenderID: PeerID,
+        boundPeerID: PeerID?,
+        localPeerID: PeerID,
+        directAnnounceTTL: UInt8,
+        nowMs: UInt64 = UInt64(Date().timeIntervalSince1970 * 1000),
+        maxTimestampSkewMs: UInt64 = 120_000,
+        isValidSyncResponse: (PeerID) -> Bool
+    ) -> Result<BLEIngressPacketContext, Rejection> {
+        let contextResult = BLEIngressLinkRegistry.packetContext(
+            for: packet,
+            claimedSenderID: claimedSenderID,
+            boundPeerID: boundPeerID,
+            localPeerID: localPeerID,
+            directAnnounceTTL: directAnnounceTTL
+        )
+
+        let context: BLEIngressPacketContext
+        switch contextResult {
+        case .success(let acceptedContext):
+            context = acceptedContext
+        case .failure(.selfLoopback(let packetType)):
+            return .failure(.selfLoopback(packetType: packetType))
+        case .failure(.directSenderMismatch(let boundPeerID, let claimedSenderID)):
+            return .failure(.directSenderMismatch(boundPeerID: boundPeerID, claimedSenderID: claimedSenderID))
+        }
+
+        switch validatePayload(
+            packet,
+            from: context.validationPeerID,
+            nowMs: nowMs,
+            maxTimestampSkewMs: maxTimestampSkewMs,
+            isValidSyncResponse: isValidSyncResponse
+        ) {
+        case .success:
+            return .success(context)
+        case .failure(let rejection):
+            return .failure(rejection)
+        }
+    }
+
+    static func validatePayload(
+        _ packet: BitchatPacket,
+        from peerID: PeerID,
+        nowMs: UInt64 = UInt64(Date().timeIntervalSince1970 * 1000),
+        maxTimestampSkewMs: UInt64 = 120_000,
+        isValidSyncResponse: (PeerID) -> Bool
+    ) -> Result<Void, Rejection> {
+        if packet.isRSR {
+            guard isValidSyncResponse(peerID) else {
+                return .failure(.invalidRSR(peerID: peerID))
+            }
+            return .success(())
+        }
+
+        let packetTime = packet.timestamp
+        let skew = packetTime > nowMs ? packetTime - nowMs : nowMs - packetTime
+        guard skew <= maxTimestampSkewMs else {
+            return .failure(.timestampSkew(peerID: peerID, skewMs: skew, maxSkewMs: maxTimestampSkewMs))
+        }
+
+        return .success(())
+    }
+}

bitchat/Services/BLE/BLELinkStateStore.swift

@@ -0,0 +1,243 @@
+import BitFoundation
+import CoreBluetooth
+import Foundation
+
+struct BLEPeripheralLinkState {
+    let peripheral: CBPeripheral
+    var characteristic: CBCharacteristic?
+    var peerID: PeerID?
+    var isConnecting: Bool
+    var isConnected: Bool
+    var lastConnectionAttempt: Date?
+    var assembler: NotificationStreamAssembler
+}
+
+struct BLEDirectLinkState: Equatable {
+    let hasPeripheral: Bool
+    let hasCentral: Bool
+}
+
+struct BLESubscribedCentralSnapshot {
+    let centrals: [CBCentral]
+    let peerIDsByCentralUUID: [String: PeerID]
+
+    func central(for peerID: PeerID) -> CBCentral? {
+        centrals.first { peerIDsByCentralUUID[$0.identifier.uuidString] == peerID }
+    }
+}
+
+/// Owns all BLE link state (peripheral connections we hold as central, and
+/// central subscriptions we serve as peripheral). The store has no internal
+/// locking: every access must happen on the single owning queue (the BLE
+/// queue). Other queues must go through BLEService's `readLinkState`, which
+/// hops to that queue. Call `assumeOwnership(of:)` to have debug builds trap
+/// any access from the wrong queue.
+final class BLELinkStateStore {
+    private(set) var peripherals: [String: BLEPeripheralLinkState] = [:]
+    private(set) var peerToPeripheralUUID: [PeerID: String] = [:]
+    private(set) var subscribedCentrals: [CBCentral] = []
+    private(set) var centralToPeerID: [String: PeerID] = [:]
+
+    #if DEBUG
+    private var ownerQueue: DispatchQueue?
+    #endif
+
+    /// Pin the store to its owning queue. Debug-only enforcement; release
+    /// builds are unchanged.
+    func assumeOwnership(of queue: DispatchQueue) {
+        #if DEBUG
+        ownerQueue = queue
+        #endif
+    }
+
+    @inline(__always)
+    private func assertOwned() {
+        #if DEBUG
+        if let queue = ownerQueue {
+            dispatchPrecondition(condition: .onQueue(queue))
+        }
+        #endif
+    }
+
+    var peripheralStates: [BLEPeripheralLinkState] {
+        assertOwned()
+        return Array(peripherals.values)
+    }
+
+    var subscribedCentralSnapshot: BLESubscribedCentralSnapshot {
+        assertOwned()
+        return BLESubscribedCentralSnapshot(
+            centrals: subscribedCentrals,
+            peerIDsByCentralUUID: centralToPeerID
+        )
+    }
+
+    var subscribedCentralCount: Int {
+        assertOwned()
+        return subscribedCentrals.count
+    }
+
+    var connectedOrConnectingPeripheralCount: Int {
+        assertOwned()
+        return peripherals.values.filter { $0.isConnected || $0.isConnecting }.count
+    }
+
+    func state(forPeripheralID peripheralID: String) -> BLEPeripheralLinkState? {
+        assertOwned()
+        return peripherals[peripheralID]
+    }
+
+    func setPeripheralState(_ state: BLEPeripheralLinkState, for peripheralID: String) {
+        assertOwned()
+        peripherals[peripheralID] = state
+    }
+
+    @discardableResult
+    func updatePeripheral(
+        _ peripheralID: String,
+        _ update: (inout BLEPeripheralLinkState) -> Void
+    ) -> BLEPeripheralLinkState? {
+        assertOwned()
+        guard var state = peripherals[peripheralID] else { return nil }
+        update(&state)
+        peripherals[peripheralID] = state
+        return state
+    }
+
+    func beginConnecting(to peripheral: CBPeripheral, at date: Date) {
+        setPeripheralState(
+            BLEPeripheralLinkState(
+                peripheral: peripheral,
+                characteristic: nil,
+                peerID: nil,
+                isConnecting: true,
+                isConnected: false,
+                lastConnectionAttempt: date,
+                assembler: NotificationStreamAssembler()
+            ),
+            for: peripheral.identifier.uuidString
+        )
+    }
+
+    func markConnected(_ peripheral: CBPeripheral) {
+        let peripheralID = peripheral.identifier.uuidString
+        if updatePeripheral(peripheralID, {
+            $0.isConnecting = false
+            $0.isConnected = true
+        }) == nil {
+            setPeripheralState(
+                BLEPeripheralLinkState(
+                    peripheral: peripheral,
+                    characteristic: nil,
+                    peerID: nil,
+                    isConnecting: false,
+                    isConnected: true,
+                    lastConnectionAttempt: nil,
+                    assembler: NotificationStreamAssembler()
+                ),
+                for: peripheralID
+            )
+        }
+    }
+
+    func updateCharacteristic(_ characteristic: CBCharacteristic, forPeripheralID peripheralID: String) {
+        updatePeripheral(peripheralID) {
+            $0.characteristic = characteristic
+        }
+    }
+
+    func directPeripheralState(for peerID: PeerID) -> BLEPeripheralLinkState? {
+        assertOwned()
+        return peerToPeripheralUUID[peerID].flatMap { peripherals[$0] }
+    }
+
+    func directLinkState(for peerID: PeerID) -> BLEDirectLinkState {
+        assertOwned()
+        let peripheralUUID = peerToPeripheralUUID[peerID]
+        let hasPeripheral = peripheralUUID.flatMap { peripherals[$0]?.isConnected } ?? false
+        let hasCentral = centralToPeerID.values.contains(peerID)
+        return BLEDirectLinkState(hasPeripheral: hasPeripheral, hasCentral: hasCentral)
+    }
+
+    func links(to peerID: PeerID?) -> Set<BLEIngressLinkID> {
+        assertOwned()
+        guard let peerID else { return [] }
+
+        var links: Set<BLEIngressLinkID> = []
+        if let peripheralUUID = peerToPeripheralUUID[peerID] {
+            links.insert(.peripheral(peripheralUUID))
+        }
+        for (centralUUID, mappedPeerID) in centralToPeerID where mappedPeerID == peerID {
+            links.insert(.central(centralUUID))
+        }
+        return links
+    }
+
+    func peerID(forPeripheralID peripheralID: String) -> PeerID? {
+        assertOwned()
+        return peripherals[peripheralID]?.peerID
+    }
+
+    func peerID(forCentralUUID centralUUID: String) -> PeerID? {
+        assertOwned()
+        return centralToPeerID[centralUUID]
+    }
+
+    func addSubscribedCentral(_ central: CBCentral) {
+        assertOwned()
+        guard !subscribedCentrals.contains(central) else { return }
+        subscribedCentrals.append(central)
+    }
+
+    func removeSubscribedCentral(_ central: CBCentral) -> PeerID? {
+        assertOwned()
+        let centralUUID = central.identifier.uuidString
+        subscribedCentrals.removeAll { $0.identifier == central.identifier }
+        return centralToPeerID.removeValue(forKey: centralUUID)
+    }
+
+    func bindCentral(_ centralUUID: String, to peerID: PeerID) {
+        assertOwned()
+        centralToPeerID[centralUUID] = peerID
+    }
+
+    func bindPeripheral(_ peripheralUUID: String, to peerID: PeerID) {
+        assertOwned()
+        if updatePeripheral(peripheralUUID, { $0.peerID = peerID }) != nil {
+            peerToPeripheralUUID[peerID] = peripheralUUID
+        }
+    }
+
+    func removePeripheral(_ peripheralID: String) -> PeerID? {
+        assertOwned()
+        let peerID = peripherals.removeValue(forKey: peripheralID)?.peerID
+        if let peerID {
+            peerToPeripheralUUID.removeValue(forKey: peerID)
+        }
+        return peerID
+    }
+
+    func clearPeripherals() -> [PeerID] {
+        assertOwned()
+        let peerIDs = peripherals.compactMap { $0.value.peerID }
+        peripherals.removeAll()
+        peerToPeripheralUUID.removeAll()
+        return peerIDs
+    }
+
+    func clearCentrals() -> [PeerID] {
+        assertOwned()
+        let peerIDs = Array(centralToPeerID.values)
+        subscribedCentrals.removeAll()
+        centralToPeerID.removeAll()
+        return peerIDs
+    }
+
+    func clearAll() {
+        assertOwned()
+        peripherals.removeAll()
+        peerToPeripheralUUID.removeAll()
+        subscribedCentrals.removeAll()
+        centralToPeerID.removeAll()
+    }
+}

bitchat/Services/BLE/BLELogRateLimiter.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+final class BLELogRateLimiter {
+    private let defaultMinimumInterval: TimeInterval
+    private let queue = DispatchQueue(label: "chat.bitchat.ble.log-rate-limiter")
+    private var lastLogTimeByKey: [String: Date] = [:]
+
+    init(defaultMinimumInterval: TimeInterval) {
+        self.defaultMinimumInterval = defaultMinimumInterval
+    }
+
+    func shouldLog(
+        key: String,
+        now: Date = Date(),
+        minimumInterval: TimeInterval? = nil
+    ) -> Bool {
+        queue.sync {
+            let interval = minimumInterval ?? defaultMinimumInterval
+            if let lastLogTime = lastLogTimeByKey[key],
+               now.timeIntervalSince(lastLogTime) < interval {
+                return false
+            }
+            lastLogTimeByKey[key] = now
+            return true
+        }
+    }
+
+    func removeAll() {
+        queue.sync {
+            lastLogTimeByKey.removeAll()
+        }
+    }
+}

bitchat/Services/BLE/BLEMaintenancePolicy.swift

@@ -0,0 +1,62 @@
+import Foundation
+
+struct BLEMaintenancePlan: Equatable {
+    let shouldSendAnnounce: Bool
+    let shouldEnsureAdvertising: Bool
+    let shouldRunCleanup: Bool
+    let shouldFlushDirectedSpool: Bool
+    let shouldResetCounter: Bool
+}
+
+enum BLEMaintenancePolicy {
+    static func plan(
+        cycle: Int,
+        connectedCount: Int,
+        peerRegistryIsEmpty: Bool,
+        elapsedSinceLastAnnounce: TimeInterval,
+        hasRecentTraffic: Bool,
+        connectedAnnounceJitterOffset: TimeInterval? = nil,
+        highDegreeThreshold: Int = TransportConfig.bleHighDegreeThreshold
+    ) -> BLEMaintenancePlan {
+        BLEMaintenancePlan(
+            shouldSendAnnounce: shouldSendAnnounce(
+                connectedCount: connectedCount,
+                elapsedSinceLastAnnounce: elapsedSinceLastAnnounce,
+                hasRecentTraffic: hasRecentTraffic,
+                connectedAnnounceJitterOffset: connectedAnnounceJitterOffset,
+                highDegreeThreshold: highDegreeThreshold
+            ),
+            shouldEnsureAdvertising: peerRegistryIsEmpty,
+            shouldRunCleanup: cycle.isMultiple(of: 3),
+            shouldFlushDirectedSpool: !cycle.isMultiple(of: 2),
+            shouldResetCounter: cycle >= 6
+        )
+    }
+
+    static func shouldSendAnnounce(
+        connectedCount: Int,
+        elapsedSinceLastAnnounce: TimeInterval,
+        hasRecentTraffic: Bool,
+        connectedAnnounceJitterOffset: TimeInterval? = nil,
+        highDegreeThreshold: Int = TransportConfig.bleHighDegreeThreshold
+    ) -> Bool {
+        if hasRecentTraffic && elapsedSinceLastAnnounce >= 10.0 {
+            return true
+        }
+
+        guard connectedCount > 0 else {
+            return elapsedSinceLastAnnounce >= TransportConfig.bleAnnounceIntervalSeconds
+        }
+
+        let highDegree = connectedCount >= highDegreeThreshold
+        let base = highDegree ?
+            TransportConfig.bleConnectedAnnounceBaseSecondsDense :
+            TransportConfig.bleConnectedAnnounceBaseSecondsSparse
+        let jitter = highDegree ?
+            TransportConfig.bleConnectedAnnounceJitterDense :
+            TransportConfig.bleConnectedAnnounceJitterSparse
+        let jitterOffset = connectedAnnounceJitterOffset ?? Double.random(in: -jitter...jitter)
+
+        return elapsedSinceLastAnnounce >= base + jitterOffset
+    }
+}

bitchat/Services/BLE/BLENoisePacketHandler.swift

@@ -0,0 +1,132 @@
+import BitFoundation
+import BitLogger
+import Foundation
+
+/// Narrow environment for `BLENoisePacketHandler`.
+///
+/// All queue hops (collections barrier writes, main-actor UI notification)
+/// and every `noiseService.*` crypto call live inside the closures supplied by
+/// `BLEService`, keeping the handler queue-agnostic and synchronously testable.
+struct BLENoisePacketHandlerEnvironment {
+    /// Local peer identity at the time the packet is handled.
+    let localPeerID: () -> PeerID
+    /// Local peer ID bytes used as the sender of handshake responses.
+    let localPeerIDData: () -> Data
+    /// TTL value used for direct (non-relayed) packets.
+    let messageTTL: UInt8
+    /// Current time source.
+    let now: () -> Date
+    /// Processes an inbound handshake message, returning an optional response payload (crypto).
+    let processHandshakeMessage: (_ peerID: PeerID, _ message: Data) throws -> Data?
+    /// Whether any Noise session (established or pending) exists for the peer (crypto).
+    let hasNoiseSession: (PeerID) -> Bool
+    /// Initiates a fresh Noise handshake with the peer (crypto + send).
+    let initiateHandshake: (PeerID) -> Void
+    /// Broadcasts a packet on the mesh (caller is already on the message queue).
+    let broadcastPacket: (BitchatPacket) -> Void
+    /// Updates the registry last-seen timestamp for the peer (async barrier write).
+    let updatePeerLastSeen: (PeerID) -> Void
+    /// Decrypts an encrypted payload from the peer (crypto).
+    let decrypt: (_ payload: Data, _ peerID: PeerID) throws -> Data
+    /// Clears the peer's Noise session after an unrecoverable decrypt failure (crypto).
+    let clearSession: (PeerID) -> Void
+    /// Delivers `.noisePayloadReceived` to the UI as one main-actor hop.
+    let deliverNoisePayload: (
+        _ peerID: PeerID,
+        _ type: NoisePayloadType,
+        _ payload: Data,
+        _ timestamp: Date
+    ) -> Void
+}
+
+/// Orchestrates the Noise session domain for inbound packets: handshake
+/// processing (with response), encrypted payload decryption and dispatch,
+/// and session recovery on decrypt failure.
+final class BLENoisePacketHandler {
+    private let environment: BLENoisePacketHandlerEnvironment
+
+    init(environment: BLENoisePacketHandlerEnvironment) {
+        self.environment = environment
+    }
+
+    func handleHandshake(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        // Use NoiseEncryptionService for handshake processing
+        if PeerID(hexData: packet.recipientID) == env.localPeerID() {
+            // Handshake is for us
+            do {
+                if let response = try env.processHandshakeMessage(peerID, packet.payload) {
+                    // Send response
+                    let responsePacket = BitchatPacket(
+                        type: MessageType.noiseHandshake.rawValue,
+                        senderID: env.localPeerIDData(),
+                        recipientID: Data(hexString: peerID.id),
+                        timestamp: UInt64(env.now().timeIntervalSince1970 * 1000),
+                        payload: response,
+                        signature: nil,
+                        ttl: env.messageTTL
+                    )
+                    // We're on messageQueue from delegate callback
+                    env.broadcastPacket(responsePacket)
+                }
+
+                // Session establishment will trigger onPeerAuthenticated callback
+                // which will send any pending messages at the right time
+            } catch {
+                SecureLogger.error("Failed to process handshake: \(error)")
+                // Try initiating a new handshake
+                if !env.hasNoiseSession(peerID) {
+                    env.initiateHandshake(peerID)
+                }
+            }
+        }
+    }
+
+    func handleEncrypted(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        guard let recipientID = PeerID(hexData: packet.recipientID) else {
+            SecureLogger.warning("⚠️ Encrypted message has no recipient ID", category: .session)
+            return
+        }
+
+        if recipientID != env.localPeerID() {
+            SecureLogger.debug("🔐 Encrypted message not for me (for \(recipientID.id.prefix(8))…, I am \(env.localPeerID().id.prefix(8))…)", category: .session)
+            return
+        }
+
+        // Update lastSeen for the peer we received from (important for private messages)
+        env.updatePeerLastSeen(peerID)
+
+        do {
+            let decrypted = try env.decrypt(packet.payload, peerID)
+            guard decrypted.count > 0 else { return }
+
+            // First byte indicates the payload type
+            let payloadType = decrypted[0]
+            let payloadData = decrypted.dropFirst()
+
+            guard let noisePayloadType = NoisePayloadType(rawValue: payloadType) else {
+                SecureLogger.warning("⚠️ Unknown noise payload type: \(payloadType)")
+                return
+            }
+
+            SecureLogger.debug("🔐 Decrypted noise payload type \(noisePayloadType.description) from \(peerID.id.prefix(8))…", category: .session)
+
+            let ts = Date(timeIntervalSince1970: Double(packet.timestamp) / 1000)
+            env.deliverNoisePayload(peerID, noisePayloadType, Data(payloadData), ts)
+        } catch NoiseEncryptionError.sessionNotEstablished {
+            // We received an encrypted message before establishing a session with this peer.
+            // Trigger a handshake so future messages can be decrypted.
+            SecureLogger.debug("🔑 Encrypted message from \(peerID.id.prefix(8))… without session; initiating handshake")
+            if !env.hasNoiseSession(peerID) {
+                env.initiateHandshake(peerID)
+            }
+        } catch {
+            // Decryption failed - clear the corrupted session and re-initiate handshake
+            // This handles cases where session state got out of sync (nonce mismatch, etc.)
+            SecureLogger.error("❌ Failed to decrypt message from \(peerID.id.prefix(8))…: \(error) - clearing session and re-initiating handshake")
+            env.clearSession(peerID)
+            env.initiateHandshake(peerID)
+        }
+    }
+}

bitchat/Services/BLE/BLENoisePayloadFactory.swift

@@ -0,0 +1,25 @@
+import Foundation
+
+enum BLENoisePayloadFactory {
+    static func privateMessage(content: String, messageID: String) -> Data? {
+        guard let payload = PrivateMessagePacket(messageID: messageID, content: content).encode() else {
+            return nil
+        }
+
+        return typedPayload(.privateMessage, payload: payload)
+    }
+
+    static func readReceipt(originalMessageID: String) -> Data {
+        typedPayload(.readReceipt, payload: Data(originalMessageID.utf8))
+    }
+
+    static func delivered(messageID: String) -> Data {
+        typedPayload(.delivered, payload: Data(messageID.utf8))
+    }
+
+    static func typedPayload(_ type: NoisePayloadType, payload: Data) -> Data {
+        var typed = Data([type.rawValue])
+        typed.append(payload)
+        return typed
+    }
+}

bitchat/Services/BLE/BLENoiseSessionQueues.swift

@@ -0,0 +1,46 @@
+import BitFoundation
+import Foundation
+
+struct BLEPendingPrivateMessage: Equatable {
+    let content: String
+    let messageID: String
+}
+
+struct BLENoiseSessionQueues {
+    private var privateMessagesByPeerID: [PeerID: [BLEPendingPrivateMessage]] = [:]
+    private var typedPayloadsByPeerID: [PeerID: [Data]] = [:]
+
+    var isEmpty: Bool {
+        privateMessagesByPeerID.isEmpty && typedPayloadsByPeerID.isEmpty
+    }
+
+    mutating func removeAll() {
+        privateMessagesByPeerID.removeAll()
+        typedPayloadsByPeerID.removeAll()
+    }
+
+    mutating func appendPrivateMessage(content: String, messageID: String, for peerID: PeerID) {
+        privateMessagesByPeerID[peerID, default: []].append(BLEPendingPrivateMessage(content: content, messageID: messageID))
+    }
+
+    mutating func takePrivateMessages(for peerID: PeerID) -> [BLEPendingPrivateMessage] {
+        let messages = privateMessagesByPeerID[peerID] ?? []
+        privateMessagesByPeerID.removeValue(forKey: peerID)
+        return messages
+    }
+
+    mutating func prependPrivateMessages(_ messages: [BLEPendingPrivateMessage], for peerID: PeerID) {
+        guard !messages.isEmpty else { return }
+        privateMessagesByPeerID[peerID, default: []].insert(contentsOf: messages, at: 0)
+    }
+
+    mutating func appendTypedPayload(_ payload: Data, for peerID: PeerID) {
+        typedPayloadsByPeerID[peerID, default: []].append(payload)
+    }
+
+    mutating func takeTypedPayloads(for peerID: PeerID) -> [Data] {
+        let payloads = typedPayloadsByPeerID[peerID] ?? []
+        typedPayloadsByPeerID.removeValue(forKey: peerID)
+        return payloads
+    }
+}

bitchat/Services/BLE/BLEOutboundFragmentPlanner.swift

@@ -0,0 +1,137 @@
+import BitFoundation
+import Foundation
+
+struct BLEOutboundFragmentPlan {
+    let fragmentPackets: [BitchatPacket]
+    let fragmentVersion: UInt8
+    let chunkSize: Int
+    let spacingMs: Int
+
+    var totalFragments: Int {
+        fragmentPackets.count
+    }
+
+    var shouldPauseScanning: Bool {
+        totalFragments > 4
+    }
+}
+
+enum BLEOutboundFragmentPlanner {
+    private static let minimumChunkSize = 64
+    private static let fragmentIDLength = 8
+
+    static func makePlan(
+        for request: BLEOutboundFragmentTransferRequest,
+        defaultChunkSize: Int,
+        bleMaxMTU: Int,
+        fragmentID: Data = randomFragmentID()
+    ) -> BLEOutboundFragmentPlan? {
+        guard fragmentID.count == fragmentIDLength,
+              let fullData = request.packet.toBinaryData(padding: request.pad) else {
+            return nil
+        }
+
+        let sizing = sizingPolicy(
+            for: request.packet,
+            requestedMaxChunk: request.maxChunk,
+            defaultChunkSize: defaultChunkSize,
+            bleMaxMTU: bleMaxMTU
+        )
+
+        let chunks = stride(from: 0, to: fullData.count, by: sizing.chunkSize).map { offset in
+            Data(fullData[offset..<min(offset + sizing.chunkSize, fullData.count)])
+        }
+
+        guard !chunks.isEmpty else { return nil }
+
+        let fragmentRecipient: Data? = {
+            if let directedPeer = request.directedPeer {
+                return Data(hexString: directedPeer.id)
+            }
+            return request.packet.recipientID
+        }()
+
+        let fragmentPackets = chunks.enumerated().map { index, chunk in
+            makeFragmentPacket(
+                original: request.packet,
+                fragmentID: fragmentID,
+                index: index,
+                total: chunks.count,
+                fragmentData: chunk,
+                fragmentRecipient: fragmentRecipient,
+                fragmentVersion: sizing.fragmentVersion
+            )
+        }
+
+        return BLEOutboundFragmentPlan(
+            fragmentPackets: fragmentPackets,
+            fragmentVersion: sizing.fragmentVersion,
+            chunkSize: sizing.chunkSize,
+            spacingMs: spacingMs(for: request)
+        )
+    }
+
+    private static func sizingPolicy(
+        for packet: BitchatPacket,
+        requestedMaxChunk: Int?,
+        defaultChunkSize: Int,
+        bleMaxMTU: Int
+    ) -> (fragmentVersion: UInt8, chunkSize: Int) {
+        var fragmentVersion: UInt8 = 1
+        var calculatedChunk = defaultChunkSize
+
+        if let route = packet.route, !route.isEmpty {
+            fragmentVersion = 2
+            let routeSize = 1 + (route.count * 8)
+            let overhead = 16 + 8 + 8 + routeSize + 13 + 16
+            calculatedChunk = max(minimumChunkSize, bleMaxMTU - overhead)
+        }
+
+        return (
+            fragmentVersion: fragmentVersion,
+            chunkSize: max(minimumChunkSize, requestedMaxChunk ?? calculatedChunk)
+        )
+    }
+
+    private static func makeFragmentPacket(
+        original packet: BitchatPacket,
+        fragmentID: Data,
+        index: Int,
+        total: Int,
+        fragmentData: Data,
+        fragmentRecipient: Data?,
+        fragmentVersion: UInt8
+    ) -> BitchatPacket {
+        var payload = Data()
+        payload.append(fragmentID)
+        payload.append(contentsOf: withUnsafeBytes(of: UInt16(index).bigEndian) { Data($0) })
+        payload.append(contentsOf: withUnsafeBytes(of: UInt16(total).bigEndian) { Data($0) })
+        payload.append(packet.type)
+        payload.append(fragmentData)
+
+        return BitchatPacket(
+            type: MessageType.fragment.rawValue,
+            senderID: packet.senderID,
+            recipientID: fragmentRecipient,
+            timestamp: packet.timestamp,
+            payload: payload,
+            signature: nil,
+            ttl: packet.ttl,
+            version: fragmentVersion,
+            route: packet.route,
+            isRSR: packet.isRSR
+        )
+    }
+
+    private static func spacingMs(for request: BLEOutboundFragmentTransferRequest) -> Int {
+        if request.directedPeer != nil || request.packet.recipientID != nil {
+            return TransportConfig.bleFragmentSpacingDirectedMs
+        }
+
+        return TransportConfig.bleFragmentSpacingMs
+    }
+
+    private static func randomFragmentID() -> Data {
+        Data((0..<fragmentIDLength).map { _ in UInt8.random(in: 0...255) })
+    }
+}

bitchat/Services/BLE/BLEOutboundFragmentTransferScheduler.swift

@@ -0,0 +1,181 @@
+import BitFoundation
+import Foundation
+
+struct BLEOutboundFragmentTransferRequest {
+    let packet: BitchatPacket
+    let pad: Bool
+    let maxChunk: Int?
+    let directedPeer: PeerID?
+    let transferId: String?
+
+    var resolvedTransferId: String? {
+        guard packet.type == MessageType.fileTransfer.rawValue else { return nil }
+        return transferId ?? packet.payload.sha256Hex()
+    }
+}
+
+struct BLEOutboundFragmentTransferScheduler {
+    enum QueuePosition {
+        case front
+        case back
+    }
+
+    enum SubmitResult {
+        case start(request: BLEOutboundFragmentTransferRequest, reservedTransferId: String?)
+        case queued(request: BLEOutboundFragmentTransferRequest, transferId: String?, position: QueuePosition)
+    }
+
+    enum CancelResult {
+        case active(transferId: String, workItems: [DispatchWorkItem])
+        case pending(transferId: String)
+        case missing
+    }
+
+    enum SentResult: Equatable {
+        case progress(sentFragments: Int, totalFragments: Int)
+        case complete(sentFragments: Int, totalFragments: Int)
+        case missing
+    }
+
+    private struct ActiveTransferState {
+        let totalFragments: Int
+        var sentFragments: Int
+        var workItems: [DispatchWorkItem]
+    }
+
+    private var activeTransfers: [String: ActiveTransferState] = [:]
+    private var pendingTransfers: [BLEOutboundFragmentTransferRequest] = []
+
+    var activeCount: Int {
+        activeTransfers.count
+    }
+
+    var pendingCount: Int {
+        pendingTransfers.count
+    }
+
+    mutating func removeAll() -> [(id: String, workItems: [DispatchWorkItem])] {
+        let active = activeTransfers.map { ($0.key, $0.value.workItems) }
+        activeTransfers.removeAll()
+        pendingTransfers.removeAll()
+        return active
+    }
+
+    mutating func submit(
+        _ request: BLEOutboundFragmentTransferRequest,
+        maxConcurrentTransfers: Int
+    ) -> SubmitResult {
+        guard let transferId = request.resolvedTransferId else {
+            return .start(request: request, reservedTransferId: nil)
+        }
+
+        guard activeTransfers.count < maxConcurrentTransfers else {
+            pendingTransfers.append(request)
+            return .queued(request: request, transferId: transferId, position: .back)
+        }
+
+        guard activeTransfers[transferId] == nil else {
+            pendingTransfers.insert(request, at: 0)
+            return .queued(request: request, transferId: transferId, position: .front)
+        }
+
+        activeTransfers[transferId] = ActiveTransferState(totalFragments: 0, sentFragments: 0, workItems: [])
+        return .start(request: request, reservedTransferId: transferId)
+    }
+
+    mutating func activateReservedTransfer(
+        id transferId: String,
+        totalFragments: Int,
+        workItems: [DispatchWorkItem]
+    ) -> Bool {
+        guard activeTransfers[transferId] != nil else { return false }
+        activeTransfers[transferId] = ActiveTransferState(
+            totalFragments: totalFragments,
+            sentFragments: 0,
+            workItems: workItems
+        )
+        return true
+    }
+
+    mutating func updateWorkItems(_ workItems: [DispatchWorkItem], for transferId: String) -> Bool {
+        guard var state = activeTransfers[transferId] else { return false }
+        state.workItems = workItems
+        activeTransfers[transferId] = state
+        return true
+    }
+
+    mutating func releaseReservation(_ transferId: String) -> [DispatchWorkItem]? {
+        activeTransfers.removeValue(forKey: transferId)?.workItems
+    }
+
+    func isActive(_ transferId: String) -> Bool {
+        activeTransfers[transferId] != nil
+    }
+
+    mutating func cancelTransfer(_ transferId: String) -> CancelResult {
+        if let active = activeTransfers.removeValue(forKey: transferId) {
+            return .active(transferId: transferId, workItems: active.workItems)
+        }
+
+        if let pendingIndex = pendingTransfers.firstIndex(where: { $0.resolvedTransferId == transferId || $0.transferId == transferId }) {
+            pendingTransfers.remove(at: pendingIndex)
+            return .pending(transferId: transferId)
+        }
+
+        return .missing
+    }
+
+    mutating func markFragmentSent(transferId: String) -> SentResult {
+        guard var state = activeTransfers[transferId] else { return .missing }
+
+        state.sentFragments = min(state.sentFragments + 1, state.totalFragments)
+        let isComplete = state.sentFragments >= state.totalFragments
+
+        if isComplete {
+            activeTransfers.removeValue(forKey: transferId)
+            return .complete(sentFragments: state.sentFragments, totalFragments: state.totalFragments)
+        }
+
+        activeTransfers[transferId] = state
+        return .progress(sentFragments: state.sentFragments, totalFragments: state.totalFragments)
+    }
+
+    mutating func reservePendingStarts(maxConcurrentTransfers: Int) -> [SubmitResult] {
+        var availableSlots = max(0, maxConcurrentTransfers - activeTransfers.count)
+        guard availableSlots > 0, !pendingTransfers.isEmpty else { return [] }
+
+        var results: [SubmitResult] = []
+        var blockedFront: [BLEOutboundFragmentTransferRequest] = []
+
+        while availableSlots > 0, !pendingTransfers.isEmpty {
+            let request = pendingTransfers.removeFirst()
+            availableSlots -= 1
+
+            guard let transferId = request.resolvedTransferId else {
+                results.append(.start(request: request, reservedTransferId: nil))
+                continue
+            }
+
+            guard activeTransfers.count < maxConcurrentTransfers else {
+                pendingTransfers.insert(request, at: 0)
+                results.append(.queued(request: request, transferId: transferId, position: .front))
+                break
+            }
+
+            guard activeTransfers[transferId] == nil else {
+                blockedFront.append(request)
+                results.append(.queued(request: request, transferId: transferId, position: .front))
+                continue
+            }
+
+            activeTransfers[transferId] = ActiveTransferState(totalFragments: 0, sentFragments: 0, workItems: [])
+            results.append(.start(request: request, reservedTransferId: transferId))
+        }
+
+        if !blockedFront.isEmpty {
+            pendingTransfers.insert(contentsOf: blockedFront, at: 0)
+        }
+
+        return results
+    }
+}

bitchat/Services/BLE/BLEOutboundLinkPlanner.swift

@@ -0,0 +1,91 @@
+import BitFoundation
+import Foundation
+
+struct BLEOutboundLinkPlan: Equatable {
+    let directedPeerHint: PeerID?
+    let fragmentChunkSize: Int?
+    let selectedLinks: BLEFanoutSelection
+    let shouldSpoolDirectedPacket: Bool
+}
+
+enum BLEOutboundLinkPlanner {
+    static func plan(
+        packet: BitchatPacket,
+        dataCount: Int,
+        peripheralIDs: [String],
+        peripheralWriteLimits: [Int],
+        centralIDs: [String],
+        centralNotifyLimits: [Int],
+        ingressRecord: BLEIngressLinkRecord?,
+        excludedLinks: Set<BLEIngressLinkID>,
+        peripheralPeerBindings: [String: PeerID] = [:],
+        centralPeerBindings: [String: PeerID] = [:],
+        directedOnlyPeer: PeerID?
+    ) -> BLEOutboundLinkPlan {
+        if let minLimit = minimumLinkLimit(
+            peripheralWriteLimits: peripheralWriteLimits,
+            centralNotifyLimits: centralNotifyLimits
+        ), packet.type != MessageType.fragment.rawValue,
+           dataCount > minLimit {
+            return BLEOutboundLinkPlan(
+                directedPeerHint: directedPeerHint(for: packet, explicitPeer: directedOnlyPeer),
+                fragmentChunkSize: BLEOutboundPacketPolicy.fragmentChunkSize(forLinkLimit: minLimit),
+                selectedLinks: BLEFanoutSelection(peripheralIDs: [], centralIDs: []),
+                shouldSpoolDirectedPacket: false
+            )
+        }
+
+        let directedPeerHint = directedPeerHint(for: packet, explicitPeer: directedOnlyPeer)
+        let selectedLinks = BLEFanoutSelector.selectLinks(
+            peripheralIDs: peripheralIDs,
+            centralIDs: centralIDs,
+            ingressLink: ingressRecord?.link,
+            excludedLinks: excludedLinks,
+            peripheralPeerBindings: peripheralPeerBindings,
+            centralPeerBindings: centralPeerBindings,
+            directedPeerHint: directedPeerHint,
+            packetType: packet.type,
+            messageID: BLEOutboundPacketPolicy.messageID(for: packet)
+        )
+
+        return BLEOutboundLinkPlan(
+            directedPeerHint: directedPeerHint,
+            fragmentChunkSize: nil,
+            selectedLinks: selectedLinks,
+            shouldSpoolDirectedPacket: shouldSpoolDirectedPacket(
+                directedPeerHint: directedPeerHint,
+                selectedLinks: selectedLinks,
+                packetType: packet.type
+            )
+        )
+    }
+
+    static func directedPeerHint(for packet: BitchatPacket, explicitPeer: PeerID?) -> PeerID? {
+        if let explicitPeer { return explicitPeer }
+        if let recipient = PeerID(str: packet.recipientID?.hexEncodedString()), !recipient.isEmpty {
+            return recipient
+        }
+        return nil
+    }
+
+    static func minimumLinkLimit(peripheralWriteLimits: [Int], centralNotifyLimits: [Int]) -> Int? {
+        [peripheralWriteLimits.min(), centralNotifyLimits.min()]
+            .compactMap { $0 }
+            .min()
+    }
+
+    static func shouldSpoolDirectedPacket(
+        directedPeerHint: PeerID?,
+        selectedLinks: BLEFanoutSelection,
+        packetType: UInt8
+    ) -> Bool {
+        guard directedPeerHint != nil,
+              selectedLinks.peripheralIDs.isEmpty,
+              selectedLinks.centralIDs.isEmpty else {
+            return false
+        }
+
+        return packetType == MessageType.noiseEncrypted.rawValue ||
+            packetType == MessageType.noiseHandshake.rawValue
+    }
+}

bitchat/Services/BLE/BLEOutboundNotificationBuffer.swift

@@ -0,0 +1,47 @@
+import Foundation
+
+struct BLEPendingNotification<Target> {
+    let data: Data
+    let targets: [Target]?
+}
+
+struct BLEOutboundNotificationBuffer<Target> {
+    enum EnqueueResult {
+        case enqueued(count: Int)
+        case full(count: Int)
+    }
+
+    private var notifications: [BLEPendingNotification<Target>] = []
+
+    var count: Int {
+        notifications.count
+    }
+
+    var isEmpty: Bool {
+        notifications.isEmpty
+    }
+
+    mutating func removeAll() {
+        notifications.removeAll()
+    }
+
+    mutating func enqueue(data: Data, targets: [Target]?, capCount: Int) -> EnqueueResult {
+        guard notifications.count < capCount else {
+            return .full(count: notifications.count)
+        }
+
+        notifications.append(BLEPendingNotification(data: data, targets: targets))
+        return .enqueued(count: notifications.count)
+    }
+
+    mutating func takeAll() -> [BLEPendingNotification<Target>] {
+        let pending = notifications
+        notifications.removeAll()
+        return pending
+    }
+
+    mutating func prepend(_ pending: [BLEPendingNotification<Target>]) {
+        guard !pending.isEmpty else { return }
+        notifications.insert(contentsOf: pending, at: 0)
+    }
+}

bitchat/Services/BLE/BLEOutboundPacketPolicy.swift

@@ -0,0 +1,43 @@
+import BitFoundation
+import Foundation
+
+enum BLEOutboundPacketPolicy {
+    private static let fragmentFrameOverhead = 13 + 8 + 8 + 13
+
+    static func messageID(for packet: BitchatPacket) -> String {
+        BLEIngressLinkRegistry.messageID(for: packet)
+    }
+
+    static func padsBLEFrame(for packetType: UInt8) -> Bool {
+        switch MessageType(rawValue: packetType) {
+        case .noiseEncrypted, .noiseHandshake:
+            return true
+        case .none, .announce, .message, .leave, .requestSync, .fragment, .fileTransfer:
+            return false
+        }
+    }
+
+    static func priority(for packet: BitchatPacket, data: Data) -> BLEOutboundWritePriority {
+        guard let messageType = MessageType(rawValue: packet.type) else { return .low }
+        switch messageType {
+        case .fragment:
+            return .fragment(totalFragments: fragmentTotalCount(from: packet.payload))
+        case .fileTransfer:
+            return .fileTransfer
+        default:
+            return .high
+        }
+    }
+
+    static func fragmentChunkSize(forLinkLimit limit: Int) -> Int {
+        max(64, limit - fragmentFrameOverhead)
+    }
+
+    private static func fragmentTotalCount(from payload: Data) -> Int {
+        guard payload.count >= 12 else { return Int(UInt16.max) }
+        let totalHigh = Int(payload[10])
+        let totalLow = Int(payload[11])
+        let total = (totalHigh << 8) | totalLow
+        return max(total, 1)
+    }
+}

bitchat/Services/BLE/BLEOutboundWriteBuffer.swift

@@ -0,0 +1,83 @@
+import Foundation
+
+struct BLEOutboundWritePriority: Comparable {
+    let level: Int
+    let suborder: Int
+
+    static let high = BLEOutboundWritePriority(level: 0, suborder: 0)
+
+    static func fragment(totalFragments: Int) -> BLEOutboundWritePriority {
+        BLEOutboundWritePriority(level: 1, suborder: max(1, min(totalFragments, Int(UInt16.max))))
+    }
+
+    static let fileTransfer = BLEOutboundWritePriority(level: 2, suborder: Int.max - 1)
+    static let low = BLEOutboundWritePriority(level: 2, suborder: Int.max)
+
+    static func < (lhs: BLEOutboundWritePriority, rhs: BLEOutboundWritePriority) -> Bool {
+        if lhs.level != rhs.level { return lhs.level < rhs.level }
+        return lhs.suborder < rhs.suborder
+    }
+}
+
+struct BLEPendingWrite {
+    let priority: BLEOutboundWritePriority
+    let data: Data
+}
+
+struct BLEOutboundWriteBuffer {
+    enum EnqueueResult {
+        case enqueued(trimmedBytes: Int, remainingBytes: Int)
+        case oversized(bytes: Int)
+    }
+
+    private var writesByPeripheralID: [String: [BLEPendingWrite]] = [:]
+
+    var peripheralIDs: [String] {
+        Array(writesByPeripheralID.keys)
+    }
+
+    mutating func removeAll() {
+        writesByPeripheralID.removeAll()
+    }
+
+    mutating func enqueue(
+        data: Data,
+        for peripheralID: String,
+        priority: BLEOutboundWritePriority,
+        capBytes: Int
+    ) -> EnqueueResult {
+        guard data.count <= capBytes else {
+            return .oversized(bytes: data.count)
+        }
+
+        var queue = writesByPeripheralID[peripheralID] ?? []
+        let item = BLEPendingWrite(priority: priority, data: data)
+        let insertIndex = queue.firstIndex { item.priority < $0.priority } ?? queue.count
+        queue.insert(item, at: insertIndex)
+
+        var total = queue.reduce(0) { $0 + $1.data.count }
+        var trimmedBytes = 0
+
+        while total > capBytes && !queue.isEmpty {
+            let removed = queue.removeLast()
+            trimmedBytes += removed.data.count
+            total -= removed.data.count
+        }
+
+        writesByPeripheralID[peripheralID] = queue.isEmpty ? nil : queue
+        return .enqueued(trimmedBytes: trimmedBytes, remainingBytes: total)
+    }
+
+    mutating func takeAll(for peripheralID: String) -> [BLEPendingWrite] {
+        let items = writesByPeripheralID[peripheralID] ?? []
+        writesByPeripheralID[peripheralID] = nil
+        return items
+    }
+
+    mutating func prepend(_ items: [BLEPendingWrite], for peripheralID: String) {
+        guard !items.isEmpty else { return }
+        var existing = writesByPeripheralID[peripheralID] ?? []
+        existing.insert(contentsOf: items, at: 0)
+        writesByPeripheralID[peripheralID] = existing
+    }
+}

bitchat/Services/BLE/BLEPacketFreshnessPolicy.swift

@@ -0,0 +1,27 @@
+import Foundation
+
+enum BLEPacketFreshnessPolicy {
+    static let defaultMaxAgeSeconds: TimeInterval = 900
+
+    static func isBroadcastRecipient(_ recipientID: Data?) -> Bool {
+        guard let recipientID else { return true }
+        return recipientID.count == 8 && recipientID.allSatisfy { $0 == 0xFF }
+    }
+
+    static func isStale(
+        timestampMilliseconds: UInt64,
+        now: Date,
+        maxAgeSeconds: TimeInterval = defaultMaxAgeSeconds
+    ) -> Bool {
+        let nowMilliseconds = UInt64(now.timeIntervalSince1970 * 1000)
+        let maxAgeMilliseconds = UInt64(maxAgeSeconds * 1000)
+        guard nowMilliseconds >= maxAgeMilliseconds else { return false }
+        return timestampMilliseconds < nowMilliseconds - maxAgeMilliseconds
+    }
+
+    static func ageSeconds(timestampMilliseconds: UInt64, now: Date) -> Double {
+        let nowMilliseconds = UInt64(now.timeIntervalSince1970 * 1000)
+        guard nowMilliseconds >= timestampMilliseconds else { return 0 }
+        return Double(nowMilliseconds - timestampMilliseconds) / 1000.0
+    }
+}

bitchat/Services/BLE/BLEPeerEventDebouncer.swift

@@ -0,0 +1,25 @@
+import BitFoundation
+import Foundation
+
+struct BLEPeerEventDebouncer {
+    private var lastEmitByPeer: [PeerID: Date] = [:]
+
+    var count: Int {
+        lastEmitByPeer.count
+    }
+
+    @discardableResult
+    mutating func shouldEmit(peerID: PeerID, now: Date, minimumInterval: TimeInterval) -> Bool {
+        if let lastEmit = lastEmitByPeer[peerID],
+           now.timeIntervalSince(lastEmit) < minimumInterval {
+            return false
+        }
+
+        lastEmitByPeer[peerID] = now
+        return true
+    }
+
+    mutating func removeAll() {
+        lastEmitByPeer.removeAll()
+    }
+}

bitchat/Services/BLE/BLEPeerPublishCoalescer.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+enum BLEPeerPublishDecision: Equatable {
+    case publishNow
+    case schedule(delay: TimeInterval)
+    case skip
+}
+
+struct BLEPeerPublishCoalescer {
+    private var lastPublishAt: Date
+    private var publishPending: Bool
+    private let minimumInterval: TimeInterval
+
+    init(
+        lastPublishAt: Date = .distantPast,
+        publishPending: Bool = false,
+        minimumInterval: TimeInterval = 0.1
+    ) {
+        self.lastPublishAt = lastPublishAt
+        self.publishPending = publishPending
+        self.minimumInterval = minimumInterval
+    }
+
+    mutating func requestPublish(now: Date) -> BLEPeerPublishDecision {
+        let elapsed = now.timeIntervalSince(lastPublishAt)
+        if elapsed >= minimumInterval {
+            lastPublishAt = now
+            return .publishNow
+        }
+
+        guard !publishPending else {
+            return .skip
+        }
+
+        publishPending = true
+        return .schedule(delay: minimumInterval - elapsed)
+    }
+
+    mutating func scheduledPublishFired(now: Date) {
+        lastPublishAt = now
+        publishPending = false
+    }
+}

bitchat/Services/BLE/BLEPeerRegistry.swift

@@ -0,0 +1,211 @@
+import BitFoundation
+import Foundation
+
+struct BLEPeerInfo: Equatable {
+    let peerID: PeerID
+    var nickname: String
+    var isConnected: Bool
+    var noisePublicKey: Data?
+    var signingPublicKey: Data?
+    var isVerifiedNickname: Bool
+    var lastSeen: Date
+}
+
+struct BLEPeerAnnounceUpdate: Equatable {
+    let isNewPeer: Bool
+    let wasDisconnected: Bool
+    let previousNickname: String?
+}
+
+struct BLEPeerLinkPresence: Equatable {
+    var hasPeripheral: Bool
+    var hasCentral: Bool
+}
+
+struct BLERemovedPeer: Equatable {
+    let peerID: PeerID
+    let nickname: String
+}
+
+struct BLEPeerConnectivityChanges: Equatable {
+    var disconnectedPeerIDs: [PeerID] = []
+    var removedPeers: [BLERemovedPeer] = []
+}
+
+struct BLEPeerRegistry {
+    private var peers: [PeerID: BLEPeerInfo] = [:]
+
+    var isEmpty: Bool {
+        peers.isEmpty
+    }
+
+    var count: Int {
+        peers.count
+    }
+
+    var peerIDs: [PeerID] {
+        Array(peers.keys)
+    }
+
+    var connectedCount: Int {
+        peers.values.filter(\.isConnected).count
+    }
+
+    var connectedPeerIDs: [PeerID] {
+        peers.values.compactMap { $0.isConnected ? $0.peerID : nil }
+    }
+
+    var connectedRoutingData: [Data] {
+        peers.values.filter(\.isConnected).compactMap { $0.peerID.routingData }
+    }
+
+    var snapshotByID: [PeerID: BLEPeerInfo] {
+        peers
+    }
+
+    mutating func removeAll() {
+        peers.removeAll()
+    }
+
+    func info(for peerID: PeerID) -> BLEPeerInfo? {
+        peers[peerID]
+    }
+
+    mutating func upsert(_ info: BLEPeerInfo) {
+        peers[info.peerID] = info
+    }
+
+    @discardableResult
+    mutating func remove(_ peerID: PeerID) -> BLEPeerInfo? {
+        peers.removeValue(forKey: peerID)
+    }
+
+    func isConnected(_ peerID: PeerID) -> Bool {
+        peers[peerID.toShort()]?.isConnected ?? false
+    }
+
+    func isReachable(_ peerID: PeerID, now: Date) -> Bool {
+        let shortID = peerID.toShort()
+        let meshAttached = connectedCount > 0
+        guard let info = peers[shortID] else { return false }
+        if info.isConnected { return true }
+        guard meshAttached else { return false }
+
+        let retention: TimeInterval = info.isVerifiedNickname
+            ? TransportConfig.bleReachabilityRetentionVerifiedSeconds
+            : TransportConfig.bleReachabilityRetentionUnverifiedSeconds
+        return now.timeIntervalSince(info.lastSeen) <= retention
+    }
+
+    func nickname(for peerID: PeerID, connectedOnly: Bool) -> String? {
+        guard let peer = peers[peerID] else { return nil }
+        if connectedOnly && !peer.isConnected { return nil }
+        return peer.nickname
+    }
+
+    func fingerprint(for peerID: PeerID) -> String? {
+        peers[peerID]?.noisePublicKey?.sha256Fingerprint()
+    }
+
+    func displayNicknames(selfNickname: String) -> [PeerID: String] {
+        let connected = peers.filter { $0.value.isConnected }
+        let tuples = connected.map { ($0.key, $0.value.nickname, true) }
+        return PeerDisplayNameResolver.resolve(tuples, selfNickname: selfNickname)
+    }
+
+    func transportSnapshots(selfNickname: String) -> [TransportPeerSnapshot] {
+        let snapshot = Array(peers.values)
+        let resolvedNames = PeerDisplayNameResolver.resolve(
+            snapshot.map { ($0.peerID, $0.nickname, $0.isConnected) },
+            selfNickname: selfNickname
+        )
+        return snapshot.map { info in
+            TransportPeerSnapshot(
+                peerID: info.peerID,
+                nickname: resolvedNames[info.peerID] ?? info.nickname,
+                isConnected: info.isConnected,
+                noisePublicKey: info.noisePublicKey,
+                lastSeen: info.lastSeen
+            )
+        }
+    }
+
+    func collisionResolvedNickname(for peerID: PeerID, selfNickname: String) -> String? {
+        guard let info = peers[peerID], info.isVerifiedNickname else { return nil }
+        let hasCollision = peers.values.contains {
+            $0.isConnected && $0.nickname == info.nickname && $0.peerID != peerID
+        } || selfNickname == info.nickname
+        return hasCollision ? info.nickname + "#" + String(peerID.id.prefix(4)) : info.nickname
+    }
+
+    mutating func markDisconnected(_ peerID: PeerID) {
+        guard var info = peers[peerID] else { return }
+        info.isConnected = false
+        peers[peerID] = info
+    }
+
+    mutating func updateLastSeen(_ peerID: PeerID, at date: Date) {
+        guard var peer = peers[peerID] else { return }
+        peer.lastSeen = date
+        peers[peerID] = peer
+    }
+
+    mutating func upsertVerifiedAnnounce(
+        peerID: PeerID,
+        nickname: String,
+        noisePublicKey: Data,
+        signingPublicKey: Data?,
+        isConnected: Bool,
+        now: Date
+    ) -> BLEPeerAnnounceUpdate {
+        let existing = peers[peerID]
+        let update = BLEPeerAnnounceUpdate(
+            isNewPeer: existing == nil,
+            wasDisconnected: existing?.isConnected == false,
+            previousNickname: existing?.nickname
+        )
+
+        peers[peerID] = BLEPeerInfo(
+            peerID: existing?.peerID ?? peerID,
+            nickname: nickname,
+            isConnected: isConnected,
+            noisePublicKey: noisePublicKey,
+            signingPublicKey: signingPublicKey,
+            isVerifiedNickname: true,
+            lastSeen: now
+        )
+
+        return update
+    }
+
+    mutating func reconcileConnectivity(
+        now: Date,
+        linkStates: [PeerID: BLEPeerLinkPresence]
+    ) -> BLEPeerConnectivityChanges {
+        var changes = BLEPeerConnectivityChanges()
+
+        for (peerID, peer) in Array(peers) {
+            let age = now.timeIntervalSince(peer.lastSeen)
+            let retention: TimeInterval = peer.isVerifiedNickname
+                ? TransportConfig.bleReachabilityRetentionVerifiedSeconds
+                : TransportConfig.bleReachabilityRetentionUnverifiedSeconds
+
+            if peer.isConnected && age > TransportConfig.blePeerInactivityTimeoutSeconds {
+                let state = linkStates[peerID] ?? BLEPeerLinkPresence(hasPeripheral: false, hasCentral: false)
+                if !state.hasPeripheral && !state.hasCentral {
+                    var updated = peer
+                    updated.isConnected = false
+                    peers[peerID] = updated
+                    changes.disconnectedPeerIDs.append(peerID)
+                }
+            }
+
+            if !peer.isConnected && age > retention {
+                peers.removeValue(forKey: peerID)
+                changes.removedPeers.append(BLERemovedPeer(peerID: peerID, nickname: peer.nickname))
+            }
+        }
+
+        return changes
+    }
+}

bitchat/Services/BLE/BLEPeerSenderDisplayName.swift

@@ -0,0 +1,60 @@
+import BitFoundation
+import Foundation
+
+enum BLEPeerSenderDisplayName {
+    static func resolveKnownPeer(
+        peerID: PeerID,
+        localPeerID: PeerID,
+        localNickname: String,
+        peers: [PeerID: BLEPeerInfo],
+        allowConnectedUnverified: Bool
+    ) -> String? {
+        if peerID == localPeerID {
+            return localNickname
+        }
+
+        guard let info = peers[peerID] else { return nil }
+
+        if info.isVerifiedNickname {
+            return collisionResolvedName(
+                displayName: info.nickname,
+                collisionNickname: info.nickname,
+                peerID: peerID,
+                localNickname: localNickname,
+                peers: peers
+            )
+        }
+
+        if allowConnectedUnverified, info.isConnected {
+            let displayName = info.nickname.isEmpty ? anonymousNickname(for: peerID) : info.nickname
+            return collisionResolvedName(
+                displayName: displayName,
+                collisionNickname: info.nickname,
+                peerID: peerID,
+                localNickname: localNickname,
+                peers: peers
+            )
+        }
+
+        return nil
+    }
+
+    static func anonymousNickname(for peerID: PeerID) -> String {
+        "anon" + String(peerID.id.prefix(4))
+    }
+
+    private static func collisionResolvedName(
+        displayName: String,
+        collisionNickname: String,
+        peerID: PeerID,
+        localNickname: String,
+        peers: [PeerID: BLEPeerInfo]
+    ) -> String {
+        let hasCollision = peers.values.contains {
+            $0.isConnected && $0.nickname == collisionNickname && $0.peerID != peerID
+        } || localNickname == collisionNickname
+
+        guard hasCollision else { return displayName }
+        return displayName + "#" + String(peerID.id.prefix(4))
+    }
+}

bitchat/Services/BLE/BLEPublicMessageHandler.swift

@@ -0,0 +1,131 @@
+import BitFoundation
+import BitLogger
+import Foundation
+
+/// Narrow environment for `BLEPublicMessageHandler`.
+///
+/// All queue hops (collections registry reads, BLE-queue link-state reads,
+/// main-actor UI notification) live inside the closures supplied by
+/// `BLEService`, keeping the handler queue-agnostic and synchronously testable.
+struct BLEPublicMessageHandlerEnvironment {
+    /// Local peer identity at the time the message is handled.
+    let localPeerID: () -> PeerID
+    /// Local nickname used for sender resolution and collision checks.
+    let localNickname: () -> String
+    /// Current time source.
+    let now: () -> Date
+    /// Snapshot of known peers keyed by ID (registry read).
+    let peersSnapshot: () -> [PeerID: BLEPeerInfo]
+    /// Verifies a packet's signature against a known signing public key.
+    let verifyPacketSignature: (_ packet: BitchatPacket, _ signingPublicKey: Data) -> Bool
+    /// Resolves a display name from a verified packet signature for peers missing from the registry.
+    let signedSenderDisplayName: (_ packet: BitchatPacket, _ peerID: PeerID) -> String?
+    /// Tracks the broadcast message packet for gossip sync.
+    let trackPacketSeen: (BitchatPacket) -> Void
+    /// Direct link state for the peer (BLE-queue read).
+    let linkState: (PeerID) -> (hasPeripheral: Bool, hasCentral: Bool)
+    /// Resolves and consumes the original message ID for our own re-broadcast.
+    let takeSelfBroadcastMessageID: (BitchatPacket) -> String?
+    /// Delivers `.publicMessageReceived` to the UI as one main-actor hop.
+    let deliverPublicMessage: (
+        _ peerID: PeerID,
+        _ nickname: String,
+        _ content: String,
+        _ timestamp: Date,
+        _ messageID: String?
+    ) -> Void
+}
+
+/// Orchestrates inbound public (broadcast) messages: freshness/self-echo
+/// policy, sender display-name resolution, gossip tracking, payload decoding,
+/// and UI delivery.
+final class BLEPublicMessageHandler {
+    private let environment: BLEPublicMessageHandlerEnvironment
+
+    init(environment: BLEPublicMessageHandlerEnvironment) {
+        self.environment = environment
+    }
+
+    func handle(_ packet: BitchatPacket, from peerID: PeerID) {
+        let env = environment
+        let now = env.now()
+        let messageDecision = BLEPublicMessagePolicy.evaluate(
+            packet: packet,
+            from: peerID,
+            localPeerID: env.localPeerID(),
+            now: now
+        )
+
+        let messagePolicy: BLEPublicMessageAcceptance
+        switch messageDecision {
+        case .accept(let acceptance):
+            messagePolicy = acceptance
+        case .reject(.selfEcho):
+            return
+        case .reject(.staleBroadcast(let ageSeconds)):
+            SecureLogger.debug("⏰ Ignoring stale broadcast message from \(peerID.id.prefix(8))… (age: \(ageSeconds)s)", category: .session)
+            return
+        }
+
+        // Snapshot peers to avoid concurrent mutation while iterating during nickname collision checks.
+        let peersSnapshot = env.peersSnapshot()
+
+        // Public messages are always signed by their sender. `senderID` is
+        // attacker-controlled, so registry membership alone is NOT proof of
+        // identity — a peer in the registry as "verified" could be impersonated
+        // by anyone spoofing their senderID. Require a valid packet signature
+        // from the claimed sender (our own echoes are exempt; they are matched
+        // by self-broadcast tracking below).
+        //
+        // Verify against the signing key already in the (synchronously-updated)
+        // peer registry first: identity-cache persistence is asynchronous, so a
+        // message arriving right after a verified announce would otherwise be
+        // dropped because `signedSenderDisplayName` only searches the persisted
+        // cache. Fall back to that persisted-identity lookup for peers not (yet)
+        // in the registry.
+        let isSelf = peerID == env.localPeerID()
+        let registrySigningKey = peersSnapshot[peerID]?.signingPublicKey
+        let verifiedViaRegistry = !isSelf
+            && (registrySigningKey.map { env.verifyPacketSignature(packet, $0) } ?? false)
+        let signedDisplayName = (isSelf || verifiedViaRegistry) ? nil : env.signedSenderDisplayName(packet, peerID)
+        guard isSelf || verifiedViaRegistry || signedDisplayName != nil else {
+            SecureLogger.warning("🚫 Dropping public message with missing/invalid signature for claimed sender \(peerID.id.prefix(8))…", category: .security)
+            return
+        }
+
+        // Authenticity is established; prefer the registry's collision-resolved
+        // display name, then the signature-derived name.
+        guard let senderNickname = BLEPeerSenderDisplayName.resolveKnownPeer(
+            peerID: peerID,
+            localPeerID: env.localPeerID(),
+            localNickname: env.localNickname(),
+            peers: peersSnapshot,
+            allowConnectedUnverified: false
+        ) ?? signedDisplayName else {
+            SecureLogger.warning("🚫 Dropping public message from unknown peer \(peerID.id.prefix(8))…", category: .security)
+            return
+        }
+
+        if messagePolicy.shouldTrackForSync {
+            env.trackPacketSeen(packet)
+        }
+
+        guard let content = String(data: packet.payload, encoding: .utf8) else {
+            SecureLogger.error("❌ Failed to decode message payload as UTF-8", category: .session)
+            return
+        }
+        // Determine if we have a direct link to the sender
+        let directLink = env.linkState(peerID)
+        let hasDirectLink = directLink.hasPeripheral || directLink.hasCentral
+
+        let pathTag = hasDirectLink ? "direct" : "mesh"
+        SecureLogger.debug("💬 [\(senderNickname)] TTL:\(packet.ttl) (\(pathTag)) chars=\(content.count) bytes=\(packet.payload.count)", category: .session)
+
+        let ts = Date(timeIntervalSince1970: Double(packet.timestamp) / 1000)
+        var resolvedSelfMessageID: String? = nil
+        if peerID == env.localPeerID() {
+            resolvedSelfMessageID = env.takeSelfBroadcastMessageID(packet)
+        }
+        env.deliverPublicMessage(peerID, senderNickname, content, ts, resolvedSelfMessageID)
+    }
+}

bitchat/Services/BLE/BLEPublicMessagePolicy.swift

@@ -0,0 +1,42 @@
+import BitFoundation
+import Foundation
+
+struct BLEPublicMessageAcceptance: Equatable {
+    let shouldTrackForSync: Bool
+}
+
+enum BLEPublicMessageRejection: Equatable {
+    case selfEcho
+    case staleBroadcast(ageSeconds: Double)
+}
+
+enum BLEPublicMessageDecision: Equatable {
+    case accept(BLEPublicMessageAcceptance)
+    case reject(BLEPublicMessageRejection)
+}
+
+enum BLEPublicMessagePolicy {
+    static func evaluate(
+        packet: BitchatPacket,
+        from peerID: PeerID,
+        localPeerID: PeerID,
+        now: Date
+    ) -> BLEPublicMessageDecision {
+        if peerID == localPeerID && packet.ttl != 0 {
+            return .reject(.selfEcho)
+        }
+
+        let isBroadcast = BLEPacketFreshnessPolicy.isBroadcastRecipient(packet.recipientID)
+        if isBroadcast,
+           BLEPacketFreshnessPolicy.isStale(timestampMilliseconds: packet.timestamp, now: now) {
+            return .reject(.staleBroadcast(ageSeconds: BLEPacketFreshnessPolicy.ageSeconds(
+                timestampMilliseconds: packet.timestamp,
+                now: now
+            )))
+        }
+
+        return .accept(BLEPublicMessageAcceptance(
+            shouldTrackForSync: isBroadcast && packet.type == MessageType.message.rawValue
+        ))
+    }
+}

bitchat/Services/BLE/BLEReceivePipeline.swift

@@ -0,0 +1,90 @@
+import BitFoundation
+import Foundation
+
+struct BLEReceivedPacketContext: Equatable {
+    let senderID: PeerID
+    let messageID: String
+    let messageType: MessageType?
+    let shouldDeduplicate: Bool
+    let logsHandlingDetails: Bool
+}
+
+struct BLEReceivePipeline {
+    static func context(for packet: BitchatPacket, localPeerID: PeerID) -> BLEReceivedPacketContext {
+        let senderID = PeerID(hexData: packet.senderID)
+        // Include a payload digest so that distinct packets sharing the same
+        // sender/timestamp(ms)/type are not collapsed as duplicates. The
+        // post-handshake flush sends queued messages, delivery and read receipts
+        // back-to-back within a single millisecond; without the digest every
+        // packet after the first would be silently dropped.
+        let digestPrefix = packet.payload.sha256Hash().prefix(4).hexEncodedString()
+        let messageID = "\(senderID)-\(packet.timestamp)-\(packet.type)-\(digestPrefix)"
+        let messageType = MessageType(rawValue: packet.type)
+        let allowSelfSyncReplay = packet.ttl == 0 && senderID == localPeerID
+        let shouldDeduplicate = messageType != .fragment && !allowSelfSyncReplay
+
+        return BLEReceivedPacketContext(
+            senderID: senderID,
+            messageID: messageID,
+            messageType: messageType,
+            shouldDeduplicate: shouldDeduplicate,
+            logsHandlingDetails: messageType != .announce
+        )
+    }
+
+    static func shouldCancelScheduledRelayForDuplicate(connectedPeerCount: Int) -> Bool {
+        connectedPeerCount > 2
+    }
+
+    static func relayDecision(
+        for packet: BitchatPacket,
+        senderID: PeerID,
+        localPeerID: PeerID,
+        degree: Int,
+        highDegreeThreshold: Int
+    ) -> RelayDecision {
+        RelayController.decide(
+            ttl: packet.ttl,
+            senderIsSelf: senderID == localPeerID,
+            recipientIsSelf: PeerID(hexData: packet.recipientID) == localPeerID,
+            isEncrypted: packet.type == MessageType.noiseEncrypted.rawValue,
+            isDirectedEncrypted: packet.type == MessageType.noiseEncrypted.rawValue && packet.recipientID != nil,
+            isFragment: packet.type == MessageType.fragment.rawValue,
+            isDirectedFragment: packet.type == MessageType.fragment.rawValue && packet.recipientID != nil,
+            isHandshake: packet.type == MessageType.noiseHandshake.rawValue,
+            isAnnounce: packet.type == MessageType.announce.rawValue,
+            degree: degree,
+            highDegreeThreshold: highDegreeThreshold
+        )
+    }
+}
+
+struct BLERecentTrafficTracker: Equatable {
+    private var packetTimestamps: [Date] = []
+
+    var count: Int {
+        packetTimestamps.count
+    }
+
+    mutating func removeAll() {
+        packetTimestamps.removeAll()
+    }
+
+    mutating func recordPacket(at now: Date) {
+        packetTimestamps.append(now)
+        prune(at: now)
+    }
+
+    func hasTraffic(within seconds: TimeInterval, now: Date) -> Bool {
+        let cutoff = now.addingTimeInterval(-seconds)
+        return packetTimestamps.contains { $0 >= cutoff }
+    }
+
+    private mutating func prune(at now: Date) {
+        let cutoff = now.addingTimeInterval(-TransportConfig.bleRecentPacketWindowSeconds)
+        if packetTimestamps.count > TransportConfig.bleRecentPacketWindowMaxCount {
+            packetTimestamps.removeFirst(packetTimestamps.count - TransportConfig.bleRecentPacketWindowMaxCount)
+        }
+        packetTimestamps.removeAll { $0 < cutoff }
+    }
+}

bitchat/Services/BLE/BLERouteForwardingPolicy.swift

@@ -0,0 +1,93 @@
+import BitFoundation
+import Foundation
+
+struct BLERouteForwardingPlan {
+    let shouldSuppressFloodRelay: Bool
+    let forwardPacket: BitchatPacket?
+    let nextHop: PeerID?
+
+    static let allowFloodRelay = BLERouteForwardingPlan(
+        shouldSuppressFloodRelay: false,
+        forwardPacket: nil,
+        nextHop: nil
+    )
+
+    static let suppressFloodRelay = BLERouteForwardingPlan(
+        shouldSuppressFloodRelay: true,
+        forwardPacket: nil,
+        nextHop: nil
+    )
+
+    static func forward(_ packet: BitchatPacket, to nextHop: PeerID) -> BLERouteForwardingPlan {
+        BLERouteForwardingPlan(
+            shouldSuppressFloodRelay: true,
+            forwardPacket: packet,
+            nextHop: nextHop
+        )
+    }
+}
+
+struct BLERouteForwardingPolicy {
+    static func plan(
+        for packet: BitchatPacket,
+        localPeerID: PeerID,
+        localRoutingData: Data?,
+        routingPeer: (Data) -> PeerID?,
+        isPeerConnected: (PeerID) -> Bool
+    ) -> BLERouteForwardingPlan {
+        if PeerID(hexData: packet.recipientID) == localPeerID {
+            return .suppressFloodRelay
+        }
+
+        guard let route = packet.route, !route.isEmpty else {
+            return .allowFloodRelay
+        }
+
+        guard packet.ttl > 1 else {
+            return .suppressFloodRelay
+        }
+
+        guard let localRoutingData else {
+            return .allowFloodRelay
+        }
+
+        guard let localIndex = route.firstIndex(of: localRoutingData) else {
+            return forward(packet, toRouteData: route[0], routingPeer: routingPeer, isPeerConnected: isPeerConnected)
+        }
+
+        if localIndex == route.count - 1 {
+            guard let destinationPeer = PeerID(hexData: packet.recipientID),
+                  isPeerConnected(destinationPeer) else {
+                return .allowFloodRelay
+            }
+            return .forward(relayed(packet), to: destinationPeer)
+        }
+
+        return forward(
+            packet,
+            toRouteData: route[localIndex + 1],
+            routingPeer: routingPeer,
+            isPeerConnected: isPeerConnected
+        )
+    }
+
+    private static func forward(
+        _ packet: BitchatPacket,
+        toRouteData routeData: Data,
+        routingPeer: (Data) -> PeerID?,
+        isPeerConnected: (PeerID) -> Bool
+    ) -> BLERouteForwardingPlan {
+        guard let nextPeer = routingPeer(routeData),
+              isPeerConnected(nextPeer) else {
+            return .allowFloodRelay
+        }
+
+        return .forward(relayed(packet), to: nextPeer)
+    }
+
+    private static func relayed(_ packet: BitchatPacket) -> BitchatPacket {
+        var relayPacket = packet
+        relayPacket.ttl = packet.ttl - 1
+        return relayPacket
+    }
+}

bitchat/Services/BLE/BLEScanDutyPolicy.swift

@@ -0,0 +1,35 @@
+import Foundation
+
+enum BLEScanDutyPlan: Equatable {
+    case continuous
+    case dutyCycle(onDuration: TimeInterval, offDuration: TimeInterval)
+}
+
+enum BLEScanDutyPolicy {
+    static func plan(
+        dutyEnabled: Bool,
+        appIsActive: Bool,
+        connectedCount: Int,
+        hasRecentTraffic: Bool,
+        highDegreeThreshold: Int = TransportConfig.bleHighDegreeThreshold
+    ) -> BLEScanDutyPlan {
+        let forceContinuousScan = connectedCount <= 2 || hasRecentTraffic
+        let shouldDutyCycle = dutyEnabled && appIsActive && connectedCount > 0 && !forceContinuousScan
+
+        guard shouldDutyCycle else {
+            return .continuous
+        }
+
+        if connectedCount >= highDegreeThreshold {
+            return .dutyCycle(
+                onDuration: TransportConfig.bleDutyOnDurationDense,
+                offDuration: TransportConfig.bleDutyOffDurationDense
+            )
+        }
+
+        return .dutyCycle(
+            onDuration: TransportConfig.bleDutyOnDuration,
+            offDuration: TransportConfig.bleDutyOffDuration
+        )
+    }
+}

bitchat/Services/BLE/BLEScheduledRelayStore.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+struct BLEScheduledRelayStore {
+    private var relays: [String: DispatchWorkItem] = [:]
+
+    var count: Int {
+        relays.count
+    }
+
+    var isEmpty: Bool {
+        relays.isEmpty
+    }
+
+    mutating func schedule(_ workItem: DispatchWorkItem, messageID: String) {
+        relays[messageID] = workItem
+    }
+
+    @discardableResult
+    mutating func remove(messageID: String) -> DispatchWorkItem? {
+        relays.removeValue(forKey: messageID)
+    }
+
+    @discardableResult
+    mutating func cancel(messageID: String) -> Bool {
+        guard let workItem = relays.removeValue(forKey: messageID) else {
+            return false
+        }
+
+        workItem.cancel()
+        return true
+    }
+
+    mutating func cancelAll() {
+        relays.values.forEach { $0.cancel() }
+        relays.removeAll()
+    }
+
+    mutating func removeAllIfOverCapacity(_ maxCount: Int) {
+        if relays.count > maxCount {
+            relays.removeAll()
+        }
+    }
+}

bitchat/Services/BLE/BLESelfBroadcastTracker.swift

@@ -0,0 +1,40 @@
+import BitFoundation
+import Foundation
+
+struct BLESelfBroadcastTracker {
+    private struct Entry {
+        let messageID: String
+        let sentAt: Date
+    }
+
+    private var entriesByDedupID: [String: Entry] = [:]
+
+    var isEmpty: Bool {
+        entriesByDedupID.isEmpty
+    }
+
+    var count: Int {
+        entriesByDedupID.count
+    }
+
+    mutating func record(messageID: String, packet: BitchatPacket, sentAt: Date) {
+        entriesByDedupID[Self.dedupID(for: packet)] = Entry(messageID: messageID, sentAt: sentAt)
+    }
+
+    mutating func takeMessageID(for packet: BitchatPacket) -> String? {
+        entriesByDedupID.removeValue(forKey: Self.dedupID(for: packet))?.messageID
+    }
+
+    mutating func prune(before cutoff: Date) {
+        guard !entriesByDedupID.isEmpty else { return }
+        entriesByDedupID = entriesByDedupID.filter { cutoff <= $0.value.sentAt }
+    }
+
+    mutating func removeAll() {
+        entriesByDedupID.removeAll()
+    }
+
+    static func dedupID(for packet: BitchatPacket) -> String {
+        "\(packet.senderID.hexEncodedString())-\(packet.timestamp)-\(packet.type)"
+    }
+}

bitchat/Services/BLE/BLESubscriptionAnnounceLimiter.swift

@@ -0,0 +1,71 @@
+import Foundation
+
+enum BLESubscriptionAnnounceDecision: Equatable {
+    case allowed
+    case rateLimited(backoffSeconds: TimeInterval, attemptCount: Int, suppressAnnounce: Bool)
+}
+
+struct BLESubscriptionAnnounceLimiter {
+    private struct State {
+        var lastAnnounceTime: Date
+        var attemptCount: Int
+        var currentBackoffSeconds: TimeInterval
+    }
+
+    private var states: [String: State] = [:]
+
+    var trackedCentralCount: Int {
+        states.count
+    }
+
+    mutating func removeAll() {
+        states.removeAll()
+    }
+
+    mutating func decision(for centralID: String, now: Date) -> BLESubscriptionAnnounceDecision {
+        pruneStaleEntries(now: now)
+
+        guard let existing = states[centralID] else {
+            recordAllowedAttempt(for: centralID, now: now)
+            return .allowed
+        }
+
+        let timeSinceLastAnnounce = now.timeIntervalSince(existing.lastAnnounceTime)
+        guard timeSinceLastAnnounce < existing.currentBackoffSeconds else {
+            recordAllowedAttempt(for: centralID, now: now)
+            return .allowed
+        }
+
+        let newAttemptCount = existing.attemptCount + 1
+        let newBackoff = min(
+            existing.currentBackoffSeconds * TransportConfig.bleSubscriptionRateLimitBackoffFactor,
+            TransportConfig.bleSubscriptionRateLimitMaxBackoffSeconds
+        )
+        states[centralID] = State(
+            lastAnnounceTime: now,
+            attemptCount: newAttemptCount,
+            currentBackoffSeconds: newBackoff
+        )
+
+        return .rateLimited(
+            backoffSeconds: existing.currentBackoffSeconds,
+            attemptCount: existing.attemptCount,
+            suppressAnnounce: newAttemptCount >= TransportConfig.bleSubscriptionRateLimitMaxAttempts
+        )
+    }
+
+    private mutating func recordAllowedAttempt(for centralID: String, now: Date) {
+        states[centralID] = State(
+            lastAnnounceTime: now,
+            attemptCount: 1,
+            currentBackoffSeconds: TransportConfig.bleSubscriptionRateLimitMinSeconds
+        )
+    }
+
+    private mutating func pruneStaleEntries(now: Date) {
+        let windowSeconds = TransportConfig.bleSubscriptionRateLimitWindowSeconds
+        states = states.filter { _, state in
+            now.timeIntervalSince(state.lastAnnounceTime) < windowSeconds
+        }
+    }
+}

bitchat/Services/CommandProcessor.swift

@@ -6,7 +6,6 @@
 // This is free and unencumbered software released into the public domain.
 //
 
-import Nostr
 import Foundation
 import BitFoundation
 
@@ -29,9 +28,9 @@ struct CommandGeoParticipant {
 protocol CommandContextProvider: AnyObject {
     // MARK: - State Properties
     var nickname: String { get }
+    var activeChannel: ChannelID { get }
     var selectedPrivateChatPeer: PeerID? { get }
     var blockedUsers: Set<String> { get }
-    var privateChats: [PeerID: [BitchatMessage]] { get set }
     var idBridge: NostrIdentityBridge { get }
 
     // MARK: - Peer Lookup
@@ -43,6 +42,8 @@ protocol CommandContextProvider: AnyObject {
     func startPrivateChat(with peerID: PeerID)
     func sendPrivateMessage(_ content: String, to peerID: PeerID)
     func clearCurrentPublicTimeline()
+    /// Empties the peer's chat (single-writer store intent for `/clear`).
+    func clearPrivateChat(_ peerID: PeerID)
     func sendPublicRaw(_ content: String)
 
     // MARK: - System Messages
@@ -76,7 +77,7 @@ final class CommandProcessor {
         
         // Geohash context: disable favoriting in public geohash or GeoDM
         let inGeoPublic: Bool = {
-            switch LocationChannelManager.shared.selectedChannel {
+            switch contextProvider?.activeChannel ?? .mesh {
             case .mesh: return false
             case .location: return true
             }
@@ -136,7 +137,7 @@ final class CommandProcessor {
     
     private func handleWho() -> CommandResult {
         // Show geohash participants when in a geohash channel; otherwise mesh peers
-        switch LocationChannelManager.shared.selectedChannel {
+        switch contextProvider?.activeChannel ?? .mesh {
         case .location(let ch):
             // Geohash context: show visible geohash participants (exclude self)
             guard let vm = contextProvider else { return .success(message: "nobody around") }
@@ -160,7 +161,7 @@ final class CommandProcessor {
     
     private func handleClear() -> CommandResult {
         if let peerID = contextProvider?.selectedPrivateChatPeer {
-            contextProvider?.privateChats[peerID]?.removeAll()
+            contextProvider?.clearPrivateChat(peerID)
         } else {
             contextProvider?.clearCurrentPublicTimeline()
         }

bitchat/Services/FavoritesPersistenceService.swift

@@ -34,7 +34,23 @@ final class FavoritesPersistenceService: ObservableObject {
     
     static let shared = FavoritesPersistenceService()
 
-    init(keychain: KeychainManagerProtocol = KeychainManager()) {
+    /// Default keychain for the `shared` singleton. Under test this is an
+    /// in-memory keychain so touching `shared` never blocks on securityd
+    /// (`SecItemCopyMatching` can hang in test environments) and never reads
+    /// or writes the developer's real keychain. Production behavior is
+    /// unchanged. Tests that need their own instance keep injecting a mock
+    /// via `init(keychain:)`.
+    private nonisolated static func makeDefaultKeychain() -> KeychainManagerProtocol {
+        // PreviewKeychainManager lives in _PreviewHelpers, a development
+        // asset excluded from archive builds — release code must not
+        // reference it. Tests always run Debug, so the guard is lossless.
+        #if DEBUG
+        if TestEnvironment.isRunningTests { return PreviewKeychainManager() }
+        #endif
+        return KeychainManager()
+    }
+
+    init(keychain: KeychainManagerProtocol = FavoritesPersistenceService.makeDefaultKeychain()) {
         self.keychain = keychain
         loadFavorites()
         

bitchat/Services/GeohashPresenceService.swift

@@ -8,7 +8,6 @@
 // This is free and unencumbered software released into the public domain.
 //
 
-import Nostr
 import Foundation
 import Combine
 import BitLogger
@@ -75,7 +74,7 @@ final class GeohashPresenceService: ObservableObject {
     ]
 
     private init() {
-        let idBridge = NostrIdentityBridge(keychain: KeychainManager())
+        let idBridge = NostrIdentityBridge()
         self.availableChannelsProvider = { LocationStateManager.shared.availableChannels }
         self.locationChanges = LocationStateManager.shared.$availableChannels.eraseToAnyPublisher()
         self.torReadyPublisher = NotificationCenter.default.publisher(for: .TorDidBecomeReady)

bitchat/Services/KeychainManager.swift

@@ -7,78 +7,10 @@
 //
 
 import BitLogger
-import protocol Nostr.NostrKeychainStoring
-import protocol Noise.SecureMemoryCleaner
+import BitFoundation
 import Foundation
 import Security
 
-// MARK: - Keychain Error Types
-// BCH-01-009: Proper error classification to distinguish expected states from critical failures
-
-/// Result of a keychain read operation with proper error classification
-enum KeychainReadResult {
-    case success(Data)
-    case itemNotFound        // Expected: key doesn't exist yet
-    case accessDenied        // Critical: app lacks keychain access
-    case deviceLocked        // Recoverable: device is locked
-    case authenticationFailed // Recoverable: biometric/passcode failed
-    case otherError(OSStatus) // Unexpected error
-
-    var isRecoverableError: Bool {
-        switch self {
-        case .deviceLocked, .authenticationFailed:
-            return true
-        default:
-            return false
-        }
-    }
-}
-
-/// Result of a keychain save operation with proper error classification
-enum KeychainSaveResult {
-    case success
-    case duplicateItem       // Can retry with update
-    case accessDenied        // Critical: app lacks keychain access
-    case deviceLocked        // Recoverable: device is locked
-    case storageFull         // Critical: no space available
-    case otherError(OSStatus)
-
-    var isRecoverableError: Bool {
-        switch self {
-        case .duplicateItem, .deviceLocked:
-            return true
-        default:
-            return false
-        }
-    }
-}
-
-protocol KeychainManagerProtocol: SecureMemoryCleaner, NostrKeychainStoring {
-    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
-
-    // BCH-01-009: Methods with proper error classification
-    /// Get identity key with detailed result for error handling
-    func getIdentityKeyWithResult(forKey key: String) -> KeychainReadResult
-    /// Save identity key with detailed result for error handling
-    func saveIdentityKeyWithResult(_ keyData: Data, forKey key: String) -> KeychainSaveResult
-
-    // MARK: - Generic Data Storage (consolidated from KeychainHelper)
-    /// Save data with a custom service name
-    func save(key: String, data: Data, service: String, accessible: CFString?)
-    /// Load data from a custom service
-    func load(key: String, service: String) -> Data?
-    /// Delete data from a custom service
-    func delete(key: String, service: String)
-}
-
 final class KeychainManager: KeychainManagerProtocol {
     // Use consistent service name for all keychain items
     private let service = BitchatApp.bundleID

bitchat/Services/LocationNotesManager.swift

@@ -1,5 +1,5 @@
 import BitLogger
-import Nostr
+import Combine
 import Foundation
 
 /// Dependencies for location notes, allowing tests to stub relay/identity behavior.
@@ -15,8 +15,10 @@ struct LocationNotesDependencies {
     var sendEvent: SendEvent
     var deriveIdentity: (_ geohash: String) throws -> NostrIdentity
     var now: () -> Date
-    
-    private static let idBridge = NostrIdentityBridge(keychain: KeychainManager())
+    // Fires when the geo relay directory refreshes; used to retry after "no relays".
+    var relayDirectoryUpdates: AnyPublisher<Void, Never> = Empty(completeImmediately: false).eraseToAnyPublisher()
+
+    private static let idBridge = NostrIdentityBridge()
 
     static let live = LocationNotesDependencies(
         relayLookup: { geohash, count in
@@ -40,7 +42,11 @@ struct LocationNotesDependencies {
         deriveIdentity: { geohash in
             try idBridge.deriveIdentity(forGeohash: geohash)
         },
-        now: { Date() }
+        now: { Date() },
+        relayDirectoryUpdates: NotificationCenter.default
+            .publisher(for: .geoRelayDirectoryDidRefresh)
+            .map { _ in () }
+            .eraseToAnyPublisher()
     )
 }
 
@@ -78,6 +84,7 @@ final class LocationNotesManager: ObservableObject {
     @Published private(set) var errorMessage: String?
     private var subscriptionID: String?
     private var noteIDs = Set<String>() // O(1) duplicate detection
+    private var directoryUpdateCancellable: AnyCancellable?
     private let dependencies: LocationNotesDependencies
     private let maxNotesInMemory = 500 // Defensive cap (relay limit is 200)
 
@@ -102,6 +109,15 @@ final class LocationNotesManager: ObservableObject {
             SecureLogger.warning("LocationNotesManager: invalid geohash '\(norm)' (expected 8 valid base32 chars)", category: .session)
         }
         subscribe()
+        // The relay directory may load after init (remote fetch over Tor);
+        // retry automatically instead of staying stuck on "no relays".
+        directoryUpdateCancellable = dependencies.relayDirectoryUpdates
+            .sink { [weak self] in
+                Task { @MainActor [weak self] in
+                    guard let self, self.state == .noRelays else { return }
+                    self.subscribe()
+                }
+            }
     }
 
     func setGeohash(_ newGeohash: String) {

bitchat/Services/LocationStateManager.swift

@@ -594,6 +594,22 @@ final class LocationStateManager: NSObject, CLLocationManagerDelegate, Observabl
         }
     }
 
+    /// Removes all persisted location state and resets the in-memory view.
+    /// Used by the panic wipe — selected channel, teleport set and bookmarks
+    /// (which reveal where the user has been) must not survive on device.
+    func panicWipe() {
+        storage.removeObject(forKey: selectedChannelKey)
+        storage.removeObject(forKey: teleportedStoreKey)
+        storage.removeObject(forKey: bookmarksKey)
+        storage.removeObject(forKey: bookmarkNamesKey)
+        teleportedSet.removeAll()
+        bookmarkMembership.removeAll()
+        bookmarks = []
+        bookmarkNames = [:]
+        teleported = false
+        selectedChannel = .mesh
+    }
+
     private static func normalizeGeohash(_ s: String) -> String {
         let allowed = Set("0123456789bcdefghjkmnpqrstuvwxyz")
         return s

bitchat/Services/MessageRouter.swift

@@ -6,6 +6,13 @@ import Foundation
 @MainActor
 final class MessageRouter {
     private let transports: [Transport]
+    private let now: () -> Date
+
+    /// Invoked whenever a retained private message is dropped without a
+    /// delivery ack (attempt cap, TTL expiry, or per-peer overflow eviction)
+    /// so the UI can surface the failure instead of leaving the message in a
+    /// stale "sending/sent" state forever.
+    var onMessageDropped: ((_ messageID: String, _ peerID: PeerID) -> Void)?
 
     // Outbox entry with timestamp for TTL-based eviction
     private struct QueuedMessage {
@@ -13,6 +20,7 @@ final class MessageRouter {
         let nickname: String
         let messageID: String
         let timestamp: Date
+        var sendAttempts: Int = 0
     }
 
     private var outbox: [PeerID: [QueuedMessage]] = [:]
@@ -20,9 +28,13 @@ final class MessageRouter {
     // Outbox limits to prevent unbounded memory growth
     private static let maxMessagesPerPeer = 100
     private static let messageTTLSeconds: TimeInterval = 24 * 60 * 60 // 24 hours
+    // Bound resends of messages sent on a weak reachability signal that never
+    // get a delivery ack (e.g. peer on an old client that doesn't ack).
+    private static let maxSendAttempts = 8
 
-    init(transports: [Transport]) {
+    init(transports: [Transport], now: @escaping () -> Date = Date.init) {
         self.transports = transports
+        self.now = now
 
         // Observe favorites changes to learn Nostr mapping and flush queued messages
         NotificationCenter.default.addObserver(
@@ -61,26 +73,54 @@ final class MessageRouter {
     // MARK: - Message Sending
 
     func sendPrivate(_ content: String, to peerID: PeerID, recipientNickname: String, messageID: String) {
-        if let transport = reachableTransport(for: peerID) {
-            SecureLogger.debug("Routing PM via \(type(of: transport)) to \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+        if let transport = connectedTransport(for: peerID) {
+            // A live link is a strong delivery signal; trust it outright.
+            SecureLogger.debug("Routing PM via \(type(of: transport)) (connected) to \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
             transport.sendPrivateMessage(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
+            return
+        }
+
+        let message = QueuedMessage(content: content, nickname: recipientNickname, messageID: messageID, timestamp: now(), sendAttempts: 1)
+        if let transport = reachableTransport(for: peerID) {
+            // Reachability without a connection is a freshness heuristic (e.g.
+            // the mesh retention window), so the send can silently go nowhere.
+            // Send now, but retain a copy until a delivery/read ack clears it;
+            // receivers dedup resends by message ID.
+            SecureLogger.debug("Routing PM via \(type(of: transport)) (reachable) to \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+            transport.sendPrivateMessage(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
+            enqueue(message, for: peerID)
         } else {
-            // Queue for later with timestamp for TTL tracking
-            if outbox[peerID] == nil { outbox[peerID] = [] }
-
-            let message = QueuedMessage(content: content, nickname: recipientNickname, messageID: messageID, timestamp: Date())
-            outbox[peerID]?.append(message)
-
-            // Enforce per-peer size limit with FIFO eviction
-            if let count = outbox[peerID]?.count, count > Self.maxMessagesPerPeer {
-                let evicted = outbox[peerID]?.removeFirst()
-                SecureLogger.warning("📤 Outbox overflow for \(peerID.id.prefix(8))… - evicted oldest message: \(evicted?.messageID.prefix(8) ?? "?")…", category: .session)
-            }
-
+            var unsent = message
+            unsent.sendAttempts = 0
+            enqueue(unsent, for: peerID)
             SecureLogger.debug("Queued PM for \(peerID.id.prefix(8))… (no reachable transport) id=\(messageID.prefix(8))… queue=\(outbox[peerID]?.count ?? 0)", category: .session)
         }
     }
 
+    /// A delivery or read ack confirms receipt; stop retaining the message.
+    func markDelivered(_ messageID: String) {
+        for (peerID, queue) in outbox {
+            let filtered = queue.filter { $0.messageID != messageID }
+            guard filtered.count != queue.count else { continue }
+            outbox[peerID] = filtered.isEmpty ? nil : filtered
+        }
+    }
+
+    private func enqueue(_ message: QueuedMessage, for peerID: PeerID) {
+        var queue = outbox[peerID] ?? []
+        // Re-sending an already-queued ID replaces the entry (keeps attempt count fresh)
+        queue.removeAll { $0.messageID == message.messageID }
+        queue.append(message)
+
+        // Enforce per-peer size limit with FIFO eviction
+        if queue.count > Self.maxMessagesPerPeer {
+            let evicted = queue.removeFirst()
+            SecureLogger.warning("📤 Outbox overflow for \(peerID.id.prefix(8))… - evicted oldest message: \(evicted.messageID.prefix(8))…", category: .session)
+            onMessageDropped?(evicted.messageID, peerID)
+        }
+        outbox[peerID] = queue
+    }
+
     func sendReadReceipt(_ receipt: ReadReceipt, to peerID: PeerID) {
         if let transport = reachableTransport(for: peerID) {
             SecureLogger.debug("Routing READ ack via \(type(of: transport)) to \(peerID.id.prefix(8))… id=\(receipt.originalMessageID.prefix(8))…", category: .session)
@@ -111,19 +151,34 @@ final class MessageRouter {
         guard let queued = outbox[peerID], !queued.isEmpty else { return }
         SecureLogger.debug("Flushing outbox for \(peerID.id.prefix(8))… count=\(queued.count)", category: .session)
 
-        let now = Date()
+        let now = now()
         var remaining: [QueuedMessage] = []
 
         for message in queued {
             // Skip expired messages (TTL exceeded)
             if now.timeIntervalSince(message.timestamp) > Self.messageTTLSeconds {
                 SecureLogger.debug("⏰ Expired queued message for \(peerID.id.prefix(8))… id=\(message.messageID.prefix(8))… (age: \(Int(now.timeIntervalSince(message.timestamp)))s)", category: .session)
+                onMessageDropped?(message.messageID, peerID)
                 continue
             }
 
-            if let transport = reachableTransport(for: peerID) {
-                SecureLogger.debug("Outbox -> \(type(of: transport)) for \(peerID.id.prefix(8))… id=\(message.messageID.prefix(8))…", category: .session)
+            if let transport = connectedTransport(for: peerID) {
+                // Live link: send and stop retaining.
+                SecureLogger.debug("Outbox -> \(type(of: transport)) (connected) for \(peerID.id.prefix(8))… id=\(message.messageID.prefix(8))…", category: .session)
                 transport.sendPrivateMessage(message.content, to: peerID, recipientNickname: message.nickname, messageID: message.messageID)
+            } else if let transport = reachableTransport(for: peerID) {
+                // Weak signal: send but keep retaining until an ack clears it,
+                // bounded by attempt count for peers that never ack.
+                guard message.sendAttempts < Self.maxSendAttempts else {
+                    SecureLogger.warning("📤 Dropping unacked PM for \(peerID.id.prefix(8))… id=\(message.messageID.prefix(8))… after \(message.sendAttempts) attempts", category: .session)
+                    onMessageDropped?(message.messageID, peerID)
+                    continue
+                }
+                SecureLogger.debug("Outbox -> \(type(of: transport)) (reachable) for \(peerID.id.prefix(8))… id=\(message.messageID.prefix(8))…", category: .session)
+                transport.sendPrivateMessage(message.content, to: peerID, recipientNickname: message.nickname, messageID: message.messageID)
+                var retained = message
+                retained.sendAttempts += 1
+                remaining.append(retained)
             } else {
                 remaining.append(message)
             }
@@ -142,12 +197,21 @@ final class MessageRouter {
 
     /// Periodically clean up expired messages from all outboxes
     func cleanupExpiredMessages() {
-        let now = Date()
+        let now = now()
         for peerID in Array(outbox.keys) {
-            outbox[peerID]?.removeAll { now.timeIntervalSince($0.timestamp) > Self.messageTTLSeconds }
+            var expiredMessageIDs: [String] = []
+            outbox[peerID]?.removeAll { message in
+                guard now.timeIntervalSince(message.timestamp) > Self.messageTTLSeconds else { return false }
+                expiredMessageIDs.append(message.messageID)
+                return true
+            }
             if outbox[peerID]?.isEmpty == true {
                 outbox.removeValue(forKey: peerID)
             }
+            for messageID in expiredMessageIDs {
+                SecureLogger.debug("⏰ Expired queued message for \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
+                onMessageDropped?(messageID, peerID)
+            }
         }
     }
 }

bitchat/Services/NetworkActivationService.swift

@@ -1,4 +1,3 @@
-import Nostr
 import Foundation
 import BitLogger
 import Combine
@@ -45,7 +44,11 @@ final class NetworkActivationService: ObservableObject {
     private let permissionProvider: () -> LocationChannelManager.PermissionState
     private let mutualFavoritesProvider: () -> Set<Data>
     private let torController: NetworkActivationTorControlling
-    private let relayController: NetworkActivationRelayControlling
+    // Resolved lazily: NostrRelayManager.init() reads NetworkActivationService.shared
+    // (via its live dependencies), so capturing NostrRelayManager.shared here would
+    // re-enter whichever singleton's dispatch_once started first and trap at launch.
+    private lazy var relayController: NetworkActivationRelayControlling = relayControllerProvider()
+    private let relayControllerProvider: () -> NetworkActivationRelayControlling
     private let proxyController: NetworkActivationProxyControlling
     private let notificationCenter: NotificationCenter
 
@@ -56,7 +59,7 @@ final class NetworkActivationService: ObservableObject {
         permissionProvider = { LocationChannelManager.shared.permissionState }
         mutualFavoritesProvider = { FavoritesPersistenceService.shared.mutualFavorites }
         torController = TorManager.shared
-        relayController = NostrRelayManager.shared
+        relayControllerProvider = { NostrRelayManager.shared }
         proxyController = TorURLSession.shared
         notificationCenter = .default
     }
@@ -78,7 +81,7 @@ final class NetworkActivationService: ObservableObject {
         self.permissionProvider = permissionProvider
         self.mutualFavoritesProvider = mutualFavoritesProvider
         self.torController = torController
-        self.relayController = relayController
+        self.relayControllerProvider = { relayController }
         self.proxyController = proxyController
         self.notificationCenter = notificationCenter
     }

bitchat/Services/NoiseEncryptionService.swift

@@ -84,7 +84,6 @@
 
 import BitLogger
 import BitFoundation
-import Noise
 import Foundation
 import CryptoKit
 

bitchat/Services/NostrTransport.swift

@@ -1,6 +1,5 @@
 import BitLogger
 import BitFoundation
-import Nostr
 import Foundation
 import Combine
 
@@ -107,6 +106,7 @@ final class NostrTransport: Transport, @unchecked Sendable {
     // MARK: - Transport Protocol Conformance
 
     weak var delegate: BitchatDelegate?
+    weak var eventDelegate: TransportEventDelegate?
     weak var peerEventsDelegate: TransportPeerEventsDelegate?
 
     var peerSnapshotPublisher: AnyPublisher<[TransportPeerSnapshot], Never> {
@@ -142,17 +142,9 @@ final class NostrTransport: Transport, @unchecked Sendable {
     func getFingerprint(for peerID: PeerID) -> String? { nil }
     func getNoiseSessionState(for peerID: PeerID) -> LazyHandshakeState { .none }
     func triggerHandshake(with peerID: PeerID) { /* no-op */ }
-    
-    // Nostr does not use Noise sessions here; return a cached placeholder to avoid reallocation
-    private static var cachedNoiseService: NoiseEncryptionService?
-    func getNoiseService() -> NoiseEncryptionService {
-        if let noiseService = Self.cachedNoiseService {
-            return noiseService
-        }
-        let noiseService = NoiseEncryptionService(keychain: keychain)
-        Self.cachedNoiseService = noiseService
-        return noiseService
-    }
+
+    // Nostr does not use Noise sessions here; the inert Transport defaults
+    // for the noise* identity hooks apply.
 
     // Public broadcast not supported over Nostr here
     func sendMessage(_ content: String, mentions: [String]) { /* no-op */ }
@@ -174,9 +166,9 @@ final class NostrTransport: Transport, @unchecked Sendable {
     func sendReadReceipt(_ receipt: ReadReceipt, to peerID: PeerID) {
         // Enqueue and process with throttling to avoid relay rate limits
         // Use barrier to synchronize access to readQueue
-        queue.async(flags: .barrier) { [weak self] in
-            self?.readQueue.append(QueuedRead(receipt: receipt, peerID: peerID))
-            self?.processReadQueueIfNeeded()
+        queue.async(flags: .barrier) {
+            self.readQueue.append(QueuedRead(receipt: receipt, peerID: peerID))
+            self.processReadQueueIfNeeded()
         }
     }
 

bitchat/Services/NotificationStreamAssembler.swift

@@ -7,6 +7,7 @@
 //
 
 import BitLogger
+import BitFoundation
 import Foundation
 
 struct NotificationStreamAssembler {
@@ -20,6 +21,19 @@ struct NotificationStreamAssembler {
         pendingFrameExpectedLength = 0
     }
 
+    private mutating func discardLeadingPaddingIfPresent() -> Bool {
+        guard let first = buffer.first else { return false }
+        guard first != 1 && first != 2 else { return false }
+        let paddingLength = Int(first)
+        guard paddingLength > 0, paddingLength <= buffer.count else { return false }
+        guard buffer.prefix(paddingLength).allSatisfy({ $0 == first }) else { return false }
+
+        buffer.removeFirst(paddingLength)
+        pendingFrameStartedAt = nil
+        pendingFrameExpectedLength = 0
+        return true
+    }
+
     mutating func append(_ chunk: Data) -> (frames: [Data], droppedPrefixes: [UInt8], reset: Bool) {
         guard !chunk.isEmpty else { return ([], [], false) }
 
@@ -41,6 +55,9 @@ struct NotificationStreamAssembler {
         while buffer.count >= minimumFramePrefix {
             guard let version = buffer.first else { break }
             guard version == 1 || version == 2 else {
+                if discardLeadingPaddingIfPresent() {
+                    continue
+                }
                 dropped.append(buffer.removeFirst())
                 pendingFrameStartedAt = nil
                 pendingFrameExpectedLength = 0
@@ -132,6 +149,11 @@ struct NotificationStreamAssembler {
             let frame = Data(buffer.prefix(frameLength))
             frames.append(frame)
             buffer.removeFirst(frameLength)
+            _ = discardLeadingPaddingIfPresent()
+        }
+
+        if discardLeadingPaddingIfPresent() {
+            return (frames, dropped, didReset)
         }
 
         if !buffer.isEmpty, buffer.allSatisfy({ $0 == 0 }) {

bitchat/Services/PrivateChatManager.swift

@@ -8,14 +8,25 @@
 
 import BitLogger
 import BitFoundation
+import Combine
 import Foundation
 import SwiftUI
 
-/// Manages all private chat functionality
+/// Manages private chat session policy (selection, read receipts,
+/// consolidation). Message storage lives in the single-writer
+/// `ConversationStore` (docs/CONVERSATION-STORE-DESIGN.md); the
+/// `privateChats` / `unreadMessages` properties below are read-only views
+/// derived from it.
+@MainActor
 final class PrivateChatManager: ObservableObject {
-    @Published var privateChats: [PeerID: [BitchatMessage]] = [:]
-    @Published var selectedPeer: PeerID? = nil
-    @Published var unreadMessages: Set<PeerID> = []
+    /// Read-only mirror of `ConversationStore.selectedPrivatePeerID` — the
+    /// store is the sole owner of conversation selection. Kept `@Published`
+    /// so existing observers (`objectWillChange` forwarding into
+    /// `ChatViewModel`) keep firing on selection changes. Mutate via
+    /// `startChat(with:)` / `endChat()`, which route through the store's
+    /// `setSelectedPrivatePeer` intent.
+    @Published private(set) var selectedPeer: PeerID? = nil
+    private var selectedPeerMirrorCancellable: AnyCancellable? = nil
 
     private var selectedPeerFingerprint: String? = nil
     var sentReadReceipts: Set<String> = []  // Made accessible for ChatViewModel
@@ -25,13 +36,51 @@ final class PrivateChatManager: ObservableObject {
     weak var messageRouter: MessageRouter?
     // Peer service for looking up peer info during consolidation
     weak var unifiedPeerService: UnifiedPeerService?
-
-    init(meshService: Transport? = nil) {
-        self.meshService = meshService
+    /// Single source of truth for message and selection state; injected by
+    /// the bootstrapper (`wireServiceGraph`).
+    var conversationStore: ConversationStore? {
+        didSet { bindSelectionMirror() }
     }
 
-    // Cap for messages stored per private chat
-    private let privateChatCap = TransportConfig.privateChatCap
+    init(meshService: Transport? = nil, conversationStore: ConversationStore? = nil) {
+        self.meshService = meshService
+        self.conversationStore = conversationStore
+        bindSelectionMirror() // didSet does not fire during init
+    }
+
+    /// Keeps `selectedPeer` in lock-step with the store's selection axis
+    /// (including store-internal handoffs such as conversation migration).
+    private func bindSelectionMirror() {
+        guard let store = conversationStore else {
+            selectedPeerMirrorCancellable = nil
+            return
+        }
+        selectedPeerMirrorCancellable = store.$selectedPrivatePeerID
+            .sink { [weak self] peerID in
+                guard let self, self.selectedPeer != peerID else { return }
+                self.selectedPeer = peerID
+            }
+    }
+
+    // MARK: - Derived message state (read-only compat views)
+
+    /// All private chats keyed by routing peer ID, derived from the store.
+    /// Mutations go through the store's intent API only.
+    @MainActor
+    var privateChats: [PeerID: [BitchatMessage]] {
+        conversationStore?.directMessagesByRoutingPeerID() ?? [:]
+    }
+
+    /// Unread chats, derived from the store's unread state.
+    @MainActor
+    var unreadMessages: Set<PeerID> {
+        conversationStore?.unreadDirectRoutingPeerIDs() ?? []
+    }
+
+    @MainActor
+    private func messages(for peerID: PeerID) -> [BitchatMessage] {
+        conversationStore?.conversationsByID[.directPeer(peerID)]?.messages ?? []
+    }
 
     // MARK: - Message Consolidation
 
@@ -44,57 +93,51 @@ final class PrivateChatManager: ObservableObject {
     /// - Returns: True if any unread messages were found during consolidation
     @MainActor
     func consolidateMessages(for peerID: PeerID, peerNickname: String, persistedReadReceipts: Set<String>) -> Bool {
-        guard let meshService = meshService else { return false }
+        guard let meshService = meshService, let store = conversationStore else { return false }
         var hasUnreadMessages = false
 
         // 1. Consolidate from stable Noise key (64-char hex)
         if let peer = unifiedPeerService?.getPeer(by: peerID) {
             let noiseKeyHex = PeerID(hexData: peer.noisePublicKey)
+            let nostrMessages = messages(for: noiseKeyHex)
 
-            if noiseKeyHex != peerID, let nostrMessages = privateChats[noiseKeyHex], !nostrMessages.isEmpty {
-                if privateChats[peerID] == nil {
-                    privateChats[peerID] = []
-                }
-
-                let existingMessageIds = Set(privateChats[peerID]?.map { $0.id } ?? [])
+            if noiseKeyHex != peerID, !nostrMessages.isEmpty {
                 for message in nostrMessages {
-                    if !existingMessageIds.contains(message.id) {
-                        // Update senderPeerID for correct read receipts
-                        let updatedMessage = BitchatMessage(
-                            id: message.id,
-                            sender: message.sender,
-                            content: message.content,
-                            timestamp: message.timestamp,
-                            isRelay: message.isRelay,
-                            originalSender: message.originalSender,
-                            isPrivate: message.isPrivate,
-                            recipientNickname: message.recipientNickname,
-                            senderPeerID: message.senderPeerID == meshService.myPeerID ? meshService.myPeerID : peerID,
-                            mentions: message.mentions,
-                            deliveryStatus: message.deliveryStatus
-                        )
-                        privateChats[peerID]?.append(updatedMessage)
+                    // Update senderPeerID for correct read receipts
+                    let updatedMessage = BitchatMessage(
+                        id: message.id,
+                        sender: message.sender,
+                        content: message.content,
+                        timestamp: message.timestamp,
+                        isRelay: message.isRelay,
+                        originalSender: message.originalSender,
+                        isPrivate: message.isPrivate,
+                        recipientNickname: message.recipientNickname,
+                        senderPeerID: message.senderPeerID == meshService.myPeerID ? meshService.myPeerID : peerID,
+                        mentions: message.mentions,
+                        deliveryStatus: message.deliveryStatus
+                    )
+                    // Store append dedups by message ID (skips ones the
+                    // target chat already has).
+                    guard store.append(updatedMessage, to: .directPeer(peerID)) else { continue }
 
-                        // Check for recent unread messages (< 60s, not sent by us, not already read)
-                        // Use persistedReadReceipts to correctly identify already-read messages after app restart
-                        if message.senderPeerID != meshService.myPeerID {
-                            let messageAge = Date().timeIntervalSince(message.timestamp)
-                            if messageAge < 60 && !persistedReadReceipts.contains(message.id) {
-                                hasUnreadMessages = true
-                            }
+                    // Check for recent unread messages (< 60s, not sent by us, not already read)
+                    // Use persistedReadReceipts to correctly identify already-read messages after app restart
+                    if message.senderPeerID != meshService.myPeerID {
+                        let messageAge = Date().timeIntervalSince(message.timestamp)
+                        if messageAge < 60 && !persistedReadReceipts.contains(message.id) {
+                            hasUnreadMessages = true
                         }
                     }
                 }
 
-                privateChats[peerID]?.sort { $0.timestamp < $1.timestamp }
-
                 if hasUnreadMessages {
-                    unreadMessages.insert(peerID)
-                } else if unreadMessages.contains(noiseKeyHex) {
-                    unreadMessages.remove(noiseKeyHex)
+                    store.markUnread(.directPeer(peerID))
+                } else {
+                    store.markRead(.directPeer(noiseKeyHex))
                 }
 
-                privateChats.removeValue(forKey: noiseKeyHex)
+                store.removeConversation(.directPeer(noiseKeyHex))
             }
         }
 
@@ -112,52 +155,43 @@ final class PrivateChatManager: ObservableObject {
         }
 
         if !tempPeerIDsToConsolidate.isEmpty {
-            if privateChats[peerID] == nil {
-                privateChats[peerID] = []
-            }
-
-            let existingMessageIds = Set(privateChats[peerID]?.map { $0.id } ?? [])
             var consolidatedCount = 0
             var hadUnreadTemp = false
+            let unreadPeerIDs = unreadMessages
 
             for tempPeerID in tempPeerIDsToConsolidate {
-                if unreadMessages.contains(tempPeerID) {
+                if unreadPeerIDs.contains(tempPeerID) {
                     hadUnreadTemp = true
                 }
 
-                if let tempMessages = privateChats[tempPeerID] {
-                    for message in tempMessages {
-                        if !existingMessageIds.contains(message.id) {
-                            let updatedMessage = BitchatMessage(
-                                id: message.id,
-                                sender: message.sender,
-                                content: message.content,
-                                timestamp: message.timestamp,
-                                isRelay: message.isRelay,
-                                originalSender: message.originalSender,
-                                isPrivate: message.isPrivate,
-                                recipientNickname: message.recipientNickname,
-                                senderPeerID: peerID,
-                                mentions: message.mentions,
-                                deliveryStatus: message.deliveryStatus
-                            )
-                            privateChats[peerID]?.append(updatedMessage)
-                            consolidatedCount += 1
-                        }
+                for message in messages(for: tempPeerID) {
+                    let updatedMessage = BitchatMessage(
+                        id: message.id,
+                        sender: message.sender,
+                        content: message.content,
+                        timestamp: message.timestamp,
+                        isRelay: message.isRelay,
+                        originalSender: message.originalSender,
+                        isPrivate: message.isPrivate,
+                        recipientNickname: message.recipientNickname,
+                        senderPeerID: peerID,
+                        mentions: message.mentions,
+                        deliveryStatus: message.deliveryStatus
+                    )
+                    if store.append(updatedMessage, to: .directPeer(peerID)) {
+                        consolidatedCount += 1
                     }
-                    privateChats.removeValue(forKey: tempPeerID)
-                    unreadMessages.remove(tempPeerID)
                 }
+                store.removeConversation(.directPeer(tempPeerID))
             }
 
             if hadUnreadTemp {
-                unreadMessages.insert(peerID)
+                store.markUnread(.directPeer(peerID))
                 hasUnreadMessages = true
                 SecureLogger.debug("📬 Transferred unread status from temp peer IDs to \(peerID)", category: .session)
             }
 
             if consolidatedCount > 0 {
-                privateChats[peerID]?.sort { $0.timestamp < $1.timestamp }
                 SecureLogger.info("📥 Consolidated \(consolidatedCount) Nostr messages from temporary peer IDs to \(peerNickname)", category: .session)
             }
         }
@@ -168,9 +202,7 @@ final class PrivateChatManager: ObservableObject {
     /// Syncs the read receipt tracking between manager and view model for sent messages
     @MainActor
     func syncReadReceiptsForSentMessages(peerID: PeerID, nickname: String, externalReceipts: inout Set<String>) {
-        guard let messages = privateChats[peerID] else { return }
-
-        for message in messages {
+        for message in messages(for: peerID) {
             if message.sender == nickname {
                 if let status = message.deliveryStatus {
                     switch status {
@@ -184,86 +216,68 @@ final class PrivateChatManager: ObservableObject {
             }
         }
     }
-    
-    /// Start a private chat with a peer
+
+    /// Start a private chat with a peer. Selection is mutated through the
+    /// store's intent (the store owns it); the manager keeps its side
+    /// effects (fingerprint tracking, read receipts, unread clearing).
+    @MainActor
     func startChat(with peerID: PeerID) {
-        selectedPeer = peerID
-        
+        // Also creates the conversation if needed and updates the derived
+        // `selectedConversationID`; `selectedPeer` mirrors the change.
+        conversationStore?.setSelectedPrivatePeer(peerID)
+
         // Store fingerprint for persistence across reconnections
         if let fingerprint = meshService?.getFingerprint(for: peerID) {
             selectedPeerFingerprint = fingerprint
         }
-        
+
         // Mark messages as read
         markAsRead(from: peerID)
-        
-        // Initialize chat if needed
-        if privateChats[peerID] == nil {
-            privateChats[peerID] = []
-        }
     }
-    
-    /// End the current private chat
+
+    /// End the current private chat (selection returns to the active public
+    /// channel's conversation).
     func endChat() {
-        selectedPeer = nil
+        conversationStore?.setSelectedPrivatePeer(nil)
         selectedPeerFingerprint = nil
     }
 
-    /// Remove duplicate messages by ID and keep chronological order
-    func sanitizeChat(for peerID: PeerID) {
-        guard let arr = privateChats[peerID] else { return }
-        if arr.count <= 1 {
-            return
-        }
+    /// No-op since the `ConversationStore` cutover: the store maintains
+    /// chronological order and dedups by message ID on every insert, so the
+    /// per-append re-sort/dedup sweep this performed is no longer needed.
+    /// Kept only for API compatibility until step 5 removes the callers.
+    func sanitizeChat(for peerID: PeerID) {}
 
-        var indexByID: [String: Int] = [:]
-        indexByID.reserveCapacity(arr.count)
-        var deduped: [BitchatMessage] = []
-        deduped.reserveCapacity(arr.count)
-
-        for msg in arr.sorted(by: { $0.timestamp < $1.timestamp }) {
-            if let existing = indexByID[msg.id] {
-                deduped[existing] = msg
-            } else {
-                indexByID[msg.id] = deduped.count
-                deduped.append(msg)
-            }
-        }
-
-        privateChats[peerID] = deduped
-    }
-    
     /// Mark messages from a peer as read
+    @MainActor
     func markAsRead(from peerID: PeerID) {
-        unreadMessages.remove(peerID)
-        
+        conversationStore?.markRead(.directPeer(peerID))
+
         // Send read receipts for unread messages that haven't been sent yet
-        if let messages = privateChats[peerID] {
-            for message in messages {
-                if message.senderPeerID == peerID && !message.isRelay && !sentReadReceipts.contains(message.id) {
-                    sendReadReceipt(for: message)
-                }
+        for message in messages(for: peerID) {
+            if message.senderPeerID == peerID && !message.isRelay && !sentReadReceipts.contains(message.id) {
+                sendReadReceipt(for: message)
             }
         }
     }
-    
+
     // MARK: - Private Methods
-    
+
     private func sendReadReceipt(for message: BitchatMessage) {
         guard !sentReadReceipts.contains(message.id),
               let senderPeerID = message.senderPeerID else {
             return
         }
-        
+
         sentReadReceipts.insert(message.id)
-        
+
         // Create read receipt using the simplified method
         let receipt = ReadReceipt(
             originalMessageID: message.id,
             readerID: meshService?.myPeerID ?? PeerID(str: ""),
             readerNickname: meshService?.myNickname ?? ""
         )
-        
+
         // Route via MessageRouter to avoid handshakeRequired spam when session isn't established
         if let router = messageRouter {
             SecureLogger.debug("PrivateChatManager: sending READ ack for \(message.id.prefix(8))… to \(senderPeerID.id.prefix(8))… via router", category: .session)