Refactor sheet presentations to use parent-child pattern

Consolidates 9 competing sheet modifiers into a single unified system
with a SheetType enum and priority-based selection. Implements parent-child
presentation pattern for image picker as suggested by @qalandarov in PR #834:
- Main view presents image picker when NOT in a sheet
- DM/people sheet presents image picker when IN a sheet

Benefits:
- Simpler code without complex conditional bindings
- Better architecture matching UI hierarchy
- Easier to maintain with clear separation of concerns
- Type-safe enum-based sheet management

Addresses feedback on PR #834.

.cache/clang/ModuleCache/Swift-207X6UTF85MUY.swiftmodule

@@ -1,12 +0,0 @@
----
-path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/Swift.swiftmodule/arm64e-apple-macos.swiftmodule'
-dependencies:
-  - mtime:           1757258659000000000
-    path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/Swift.swiftmodule/arm64e-apple-macos.swiftmodule'
-    size:            14166264
-  - mtime:           1754189697000000000
-    path:            'usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            2261306
-    sdk_relative:    true
-version:         1
-...

.cache/clang/ModuleCache/SwiftOnoneSupport-3W234PQLRG1JJ.swiftmodule

@@ -1,16 +0,0 @@
----
-path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/SwiftOnoneSupport.swiftmodule/arm64e-apple-macos.swiftmodule'
-dependencies:
-  - mtime:           1757258662000000000
-    path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/SwiftOnoneSupport.swiftmodule/arm64e-apple-macos.swiftmodule'
-    size:            18068
-  - mtime:           1754189697000000000
-    path:            'usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            2261306
-    sdk_relative:    true
-  - mtime:           1754191141000000000
-    path:            'usr/lib/swift/SwiftOnoneSupport.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            1224
-    sdk_relative:    true
-version:         1
-...

.cache/clang/ModuleCache/_Concurrency-IW47C06QYY26.swiftmodule

@@ -1,16 +0,0 @@
----
-path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/_Concurrency.swiftmodule/arm64e-apple-macos.swiftmodule'
-dependencies:
-  - mtime:           1757258669000000000
-    path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/_Concurrency.swiftmodule/arm64e-apple-macos.swiftmodule'
-    size:            699544
-  - mtime:           1754189697000000000
-    path:            'usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            2261306
-    sdk_relative:    true
-  - mtime:           1754192470000000000
-    path:            'usr/lib/swift/_Concurrency.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            364219
-    sdk_relative:    true
-version:         1
-...

.cache/clang/ModuleCache/_StringProcessing-1C2ZFCSIKDXY1.swiftmodule

@@ -1,16 +0,0 @@
----
-path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/_StringProcessing.swiftmodule/arm64e-apple-macos.swiftmodule'
-dependencies:
-  - mtime:           1757258664000000000
-    path:            '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx/prebuilt-modules/26.0/_StringProcessing.swiftmodule/arm64e-apple-macos.swiftmodule'
-    size:            83568
-  - mtime:           1754189697000000000
-    path:            'usr/lib/swift/Swift.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            2261306
-    sdk_relative:    true
-  - mtime:           1754192532000000000
-    path:            'usr/lib/swift/_StringProcessing.swiftmodule/arm64e-apple-macos.swiftinterface'
-    size:            24507
-    sdk_relative:    true
-version:         1
-...

.github/workflows/fetch_georelays.yml

@@ -7,6 +7,7 @@ on:
 
 permissions:
   contents: write
+  pull-requests: write
 
 jobs:
   update-relay-data:
@@ -17,24 +18,54 @@ jobs:
         uses: actions/checkout@v4
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
 
       - name: Fetch GeoRelays
         run: |
-          wget https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv
+          wget -q https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv
           mv nostr_relays.csv ./relays/online_relays_gps.csv
 
-      - name: Check for changes
-        id: git-check
+      - name: Configure git
         run: |
-          git diff --exit-code || echo "changes=true" >> $GITHUB_OUTPUT
+          git config user.email "action@github.com"
+          git config user.name "GitHub Action"
 
-      - name: Commit and push changes
-        if: steps.git-check.outputs.changes == 'true'
+      - name: Create update branch if changes
+        id: create_branch
         run: |
-          git config --local user.email "action@github.com"
-          git config --local user.name "GitHub Action"
+          # exit early if no changes
+          if git diff --quiet --relays/online_relays_gps.csv; then
+            echo "changed=false" >> $GITHUB_OUTPUT
+            exit 0
+          fi
+
+          # branch name with timestamp
+          BRANCH="update-georelays-$(date -u +%Y%m%dT%H%M%SZ)"
+          git checkout -b "$BRANCH"
+
           git add relays/online_relays_gps.csv
-          git commit -m "Automated update of relay data - $(date -u)"
-          git push
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          git commit -m "Automated update of relay data - $(date -u --rfc-3339=seconds)"
+          echo "changed=true" >> $GITHUB_OUTPUT
+          echo "branch=$BRANCH" >> $GITHUB_OUTPUT
+
+      - name: Push branch
+        if: steps.create_branch.outputs.changed == 'true'
+        run: |
+          git push --set-upstream origin "${{ steps.create_branch.outputs.branch }}"
+
+      - name: Create pull request
+        if: steps.create_branch.outputs.changed == 'true'
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: Automated update of relay data
+          branch: ${{ steps.create_branch.outputs.branch }}
+          base: main
+          title: Automated update of relay data
+          body: |
+            This PR was created automatically by the scheduled workflow. It updates relays/online_relays_gps.csv from the GeoRelays source.
+          labels: automated, georelays
+
+      - name: No changes
+        if: steps.create_branch.outputs.changed != 'true'
+        run: echo "No changes to relays/online_relays_gps.csv"

.gitignore

@@ -66,6 +66,9 @@ __pycache__/
 *.tmp
 *.temp
 
+## Cache
+.cache/
+
 # Local build results
 .Result*/
 .Result*.xcresult/

Configs/Release.xcconfig

@@ -1,4 +1,4 @@
-MARKETING_VERSION = 1.4.4
+MARKETING_VERSION = 1.5.0
 CURRENT_PROJECT_VERSION = 1
 
 IPHONEOS_DEPLOYMENT_TARGET = 16.0

Justfile

@@ -14,8 +14,11 @@ default:
 # Check prerequisites
 check:
     @echo "Checking prerequisites..."
-    @command -v xcodebuild >/dev/null 2>&1 || (echo "❌ Xcode not found. Install Xcode from App Store" && exit 1)
-    @security find-identity -v -p codesigning | grep -q "Developer ID" || (echo "⚠️  No Developer ID found - code signing may fail" && exit 0)
+    @command -v xcodebuild >/dev/null 2>&1 || (echo "❌ xcodebuild not found. Install Xcode from App Store" && exit 1)
+    @xcode-select -p | grep -q "Xcode.app" || (echo "❌ Full Xcode required, not just command line tools. Install from App Store and run:\n   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer" && exit 1)
+    @test -d "/Applications/Xcode.app" || (echo "❌ Xcode.app not found in Applications folder. Install from App Store" && exit 1)
+    @xcodebuild -version >/dev/null 2>&1 || (echo "❌ Xcode not properly configured. Try:\n   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer" && exit 1)
+    @security find-identity -v -p codesigning | grep -q "Apple Development\|Developer ID" || (echo "⚠️  No Developer ID found - code signing may fail" && exit 0)
     @echo "✅ All prerequisites met"
 
 # Backup original files

bitchat.xcodeproj/project.pbxproj

@@ -312,6 +312,7 @@
 				ne,
 				"pt-BR",
 				ru,
+				tr,
 				uk,
 				"zh-Hans",
 			);

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

@@ -13,7 +13,6 @@
           "value" : "dark"
         }
       ],
-      "filename" : "image-1024 1.png",
       "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"
@@ -25,7 +24,6 @@
           "value" : "tinted"
         }
       ],
-      "filename" : "image-1024 2.png",
       "idiom" : "universal",
       "platform" : "ios",
       "size" : "1024x1024"

bitchat/BitchatApp.swift

@@ -26,11 +26,15 @@ struct BitchatApp: App {
     @NSApplicationDelegateAdaptor(MacAppDelegate.self) var appDelegate
     #endif
     
+    private let idBridge = NostrIdentityBridge()
+    
     init() {
         let keychain = KeychainManager()
+        let idBridge = self.idBridge
         _chatViewModel = StateObject(
             wrappedValue: ChatViewModel(
                 keychain: keychain,
+                idBridge: idBridge,
                 identityManager: SecureIdentityStateManager(keychain)
             )
         )
@@ -49,10 +53,9 @@ struct BitchatApp: App {
                     // 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? NostrIdentityBridge.getCurrentNostrIdentity()?.npub
-                        _ = VerificationService.shared.buildMyQRString(nickname: nickname, npub: npub)
+                        let npub = try? idBridge.getCurrentNostrIdentity()?.npub
+                        _ = VerificationService.shared.buildMyQRString(nickname: chatViewModel.nickname, npub: npub)
                     }
                     #if os(iOS)
                     appDelegate.chatViewModel = chatViewModel
@@ -218,7 +221,7 @@ final class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
             // Get peer ID from userInfo
             if let peerID = userInfo["peerID"] as? String {
                 DispatchQueue.main.async {
-                    self.chatViewModel?.startPrivateChat(with: peerID)
+                    self.chatViewModel?.startPrivateChat(with: PeerID(str: peerID))
                 }
             }
         }
@@ -238,29 +241,29 @@ final class NotificationDelegate: NSObject, UNUserNotificationCenterDelegate {
         let identifier = notification.request.identifier
         let userInfo = notification.request.content.userInfo
         
-        Task { @MainActor [weak self] in
-            guard let self = self else {
-                completionHandler([.banner, .sound])
-                return
-            }
-            // Check if this is a private message notification and chat already open
-            if identifier.hasPrefix("private-"),
-               let peerID = userInfo["peerID"] as? String,
-               self.chatViewModel?.selectedPrivateChatPeer == peerID {
+        // 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
+                if chatViewModel?.selectedPrivateChatPeer == peerID {
                     completionHandler([])
                     return
                 }
+            }
+        }
         // Suppress geohash activity notification if we're already in that geohash channel
         if identifier.hasPrefix("geo-activity-"),
            let deep = userInfo["deeplink"] as? String,
-               let gh = deep.components(separatedBy: "/").last,
-               case .location(let ch) = LocationChannelManager.shared.selectedChannel,
-               ch.geohash == gh {
+           let gh = deep.components(separatedBy: "/").last {
+            if case .location(let ch) = LocationChannelManager.shared.selectedChannel, ch.geohash == gh {
                 completionHandler([])
                 return
             }
-            completionHandler([.banner, .sound])
         }
+        
+        // Show notification in all other cases
+        completionHandler([.banner, .sound])
     }
 }
 

bitchat/Features/media/ImageUtils.swift

@@ -0,0 +1,203 @@
+import Foundation
+import ImageIO
+import UniformTypeIdentifiers
+#if os(iOS)
+import UIKit
+#else
+import AppKit
+#endif
+
+enum ImageUtilsError: Error {
+    case invalidImage
+    case encodingFailed
+}
+
+enum ImageUtils {
+    private static let compressionQuality: CGFloat = 0.85
+    private static let targetImageBytes: Int = 60_000
+
+    static func processImage(at url: URL, maxDimension: CGFloat = 512) throws -> URL {
+        // Security H1: Check file size BEFORE reading into memory
+        let attrs = try FileManager.default.attributesOfItem(atPath: url.path)
+        guard let fileSize = attrs[.size] as? Int else {
+            throw ImageUtilsError.invalidImage
+        }
+        // Allow up to 10MB source images (will be scaled down)
+        guard fileSize <= 10 * 1024 * 1024 else {
+            throw ImageUtilsError.invalidImage
+        }
+
+        let data = try Data(contentsOf: url)
+        #if os(iOS)
+        guard let image = UIImage(data: data) else { throw ImageUtilsError.invalidImage }
+        return try processImage(image, maxDimension: maxDimension)
+        #else
+        guard let image = NSImage(data: data) else { throw ImageUtilsError.invalidImage }
+        return try processImage(image, maxDimension: maxDimension)
+        #endif
+    }
+
+    #if os(iOS)
+    static func processImage(_ image: UIImage, maxDimension: CGFloat = 512) throws -> URL {
+        return try autoreleasepool {
+            // Scale the image first
+            let scaled = scaledImage(image, maxDimension: maxDimension)
+
+            // Get CGImage from UIImage - this is the key to stripping metadata
+            guard let cgImage = scaled.cgImage else {
+                throw ImageUtilsError.encodingFailed
+            }
+
+            // Use CGImageDestination to encode without metadata (same as macOS)
+            var quality = compressionQuality
+            guard var jpegData = encodeJPEG(from: cgImage, quality: quality) else {
+                throw ImageUtilsError.encodingFailed
+            }
+
+            // Compress to target size
+            while jpegData.count > targetImageBytes && quality > 0.3 {
+                quality -= 0.1
+                autoreleasepool {
+                    if let next = encodeJPEG(from: cgImage, quality: quality) {
+                        jpegData = next
+                    }
+                }
+            }
+
+            let outputURL = try makeOutputURL()
+            try jpegData.write(to: outputURL, options: .atomic)
+            return outputURL
+        }
+    }
+
+    private static func scaledImage(_ image: UIImage, maxDimension: CGFloat) -> UIImage {
+        let size = image.size
+        let maxSide = max(size.width, size.height)
+        guard maxSide > maxDimension else { return image }
+        let scale = maxDimension / maxSide
+        let newSize = CGSize(width: size.width * scale, height: size.height * scale)
+
+        // Draw into a new context to get a clean CGImage without metadata
+        UIGraphicsBeginImageContextWithOptions(newSize, true, 1.0)
+        image.draw(in: CGRect(origin: .zero, size: newSize))
+        let rendered = UIGraphicsGetImageFromCurrentImageContext()
+        UIGraphicsEndImageContext()
+        return rendered ?? image
+    }
+
+    // Shared EXIF-stripping JPEG encoder for both iOS and macOS
+    private static func encodeJPEG(from cgImage: CGImage, quality: CGFloat) -> Data? {
+        guard let data = CFDataCreateMutable(nil, 0) else {
+            return nil
+        }
+        guard let destination = CGImageDestinationCreateWithData(data, UTType.jpeg.identifier as CFString, 1, nil) else {
+            return nil
+        }
+        // Security: Strip ALL metadata (EXIF, GPS, TIFF, IPTC, XMP)
+        // By only specifying compression quality and no metadata keys,
+        // we ensure a clean JPEG with no privacy-leaking information
+        let options: [CFString: Any] = [
+            kCGImageDestinationLossyCompressionQuality: quality
+        ]
+        CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
+        guard CGImageDestinationFinalize(destination) else {
+            return nil
+        }
+        return data as Data
+    }
+    #else
+    static func processImage(_ image: NSImage, maxDimension: CGFloat = 512) throws -> URL {
+        return try autoreleasepool {
+            let scaled = scaledImage(image, maxDimension: maxDimension)
+            guard let inputCG = scaled.cgImage(forProposedRect: nil, context: nil, hints: nil) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            let width = inputCG.width
+            let height = inputCG.height
+            let colorSpace = CGColorSpace(name: CGColorSpace.sRGB) ?? CGColorSpaceCreateDeviceRGB()
+            guard let context = CGContext(
+                data: nil,
+                width: width,
+                height: height,
+                bitsPerComponent: 8,
+                bytesPerRow: 0,
+                space: colorSpace,
+                bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue
+            ) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            context.draw(inputCG, in: CGRect(x: 0, y: 0, width: width, height: height))
+            guard let cgImage = context.makeImage() else {
+                throw ImageUtilsError.encodingFailed
+            }
+            var quality = compressionQuality
+            guard var jpegData = encodeJPEG(from: cgImage, quality: quality) else {
+                throw ImageUtilsError.encodingFailed
+            }
+            while jpegData.count > targetImageBytes && quality > 0.3 {
+                quality -= 0.1
+                autoreleasepool {
+                    if let next = encodeJPEG(from: cgImage, quality: quality) {
+                        jpegData = next
+                    }
+                }
+            }
+            let outputURL = try makeOutputURL()
+            try jpegData.write(to: outputURL, options: .atomic)
+            return outputURL
+        }
+    }
+
+    private static func scaledImage(_ image: NSImage, maxDimension: CGFloat) -> NSImage {
+        let size = image.size
+        let maxSide = max(size.width, size.height)
+        guard maxSide > maxDimension else { return image }
+        let scale = maxDimension / maxSide
+        let newSize = NSSize(width: size.width * scale, height: size.height * scale)
+        let scaledImage = NSImage(size: newSize)
+        scaledImage.lockFocus()
+        image.draw(in: NSRect(origin: .zero, size: newSize),
+                   from: NSRect(origin: .zero, size: size),
+                   operation: .copy,
+                   fraction: 1.0)
+        scaledImage.unlockFocus()
+        return scaledImage
+    }
+
+    // Shared EXIF-stripping JPEG encoder for both iOS and macOS
+    private static func encodeJPEG(from cgImage: CGImage, quality: CGFloat) -> Data? {
+        guard let data = CFDataCreateMutable(nil, 0) else {
+            return nil
+        }
+        guard let destination = CGImageDestinationCreateWithData(data, UTType.jpeg.identifier as CFString, 1, nil) else {
+            return nil
+        }
+        // Security: Strip ALL metadata (EXIF, GPS, TIFF, IPTC, XMP)
+        // By only specifying compression quality and no metadata keys,
+        // we ensure a clean JPEG with no privacy-leaking information
+        let options: [CFString: Any] = [
+            kCGImageDestinationLossyCompressionQuality: quality
+        ]
+        CGImageDestinationAddImage(destination, cgImage, options as CFDictionary)
+        guard CGImageDestinationFinalize(destination) else {
+            return nil
+        }
+        return data as Data
+    }
+    #endif
+
+    private static func makeOutputURL() throws -> URL {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyyMMdd_HHmmss"
+        let fileName = "img_\(formatter.string(from: Date())).jpg"
+
+        let directory = try applicationFilesDirectory().appendingPathComponent("images/outgoing", isDirectory: true)
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true, attributes: nil)
+        return directory.appendingPathComponent(fileName)
+    }
+
+    private static func applicationFilesDirectory() throws -> URL {
+        let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        return base.appendingPathComponent("files", isDirectory: true)
+    }
+}

bitchat/Features/voice/VoiceNotePlaybackController.swift

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

bitchat/Features/voice/VoiceRecorder.swift

@@ -0,0 +1,169 @@
+import Foundation
+import AVFoundation
+
+/// Manages audio capture for mesh voice notes with predictable encoding settings.
+/// Recording runs on an internal serial queue to avoid AVAudioSession contention.
+final class VoiceRecorder: NSObject, AVAudioRecorderDelegate {
+    enum RecorderError: Error {
+        case microphoneAccessDenied
+        case recorderInitializationFailed
+        case recordingInProgress
+    }
+
+    static let shared = VoiceRecorder()
+
+    private let queue = DispatchQueue(label: "com.bitchat.voice-recorder")
+    private let paddingInterval: TimeInterval = 0.5
+
+    private var recorder: AVAudioRecorder?
+    private var currentURL: URL?
+    private var stopWorkItem: DispatchWorkItem?
+
+    private override init() {
+        super.init()
+    }
+
+    // MARK: - Permissions
+
+    @discardableResult
+    func requestPermission() async -> Bool {
+        #if os(iOS)
+        return await withCheckedContinuation { continuation in
+            AVAudioSession.sharedInstance().requestRecordPermission { granted in
+                continuation.resume(returning: granted)
+            }
+        }
+        #elseif os(macOS)
+        return await withCheckedContinuation { continuation in
+            AVCaptureDevice.requestAccess(for: .audio) { granted in
+                continuation.resume(returning: granted)
+            }
+        }
+        #else
+        return true
+        #endif
+    }
+
+    // MARK: - Recording Lifecycle
+
+    func startRecording() throws -> URL {
+        try queue.sync {
+            if recorder?.isRecording == true {
+                throw RecorderError.recordingInProgress
+            }
+
+            #if os(iOS)
+            let session = AVAudioSession.sharedInstance()
+            guard session.recordPermission == .granted else {
+                throw RecorderError.microphoneAccessDenied
+            }
+            try session.setCategory(
+                .playAndRecord,
+                mode: .default,
+                options: [.defaultToSpeaker, .allowBluetoothA2DP, .allowBluetoothHFP]
+            )
+            try session.setActive(true, options: .notifyOthersOnDeactivation)
+            #endif
+            #if os(macOS)
+            guard AVCaptureDevice.authorizationStatus(for: .audio) == .authorized else {
+                throw RecorderError.microphoneAccessDenied
+            }
+            #endif
+
+            let outputURL = try makeOutputURL()
+            let settings: [String: Any] = [
+                AVFormatIDKey: kAudioFormatMPEG4AAC,
+                AVSampleRateKey: 16_000,
+                AVNumberOfChannelsKey: 1,
+                AVEncoderBitRateKey: 20_000
+            ]
+
+            let audioRecorder = try AVAudioRecorder(url: outputURL, settings: settings)
+            audioRecorder.delegate = self
+            audioRecorder.isMeteringEnabled = true
+            audioRecorder.prepareToRecord()
+            audioRecorder.record()
+
+            recorder = audioRecorder
+            currentURL = outputURL
+            stopWorkItem?.cancel()
+            stopWorkItem = nil
+            return outputURL
+        }
+    }
+
+    func stopRecording(completion: @escaping (URL?) -> Void) {
+        queue.async { [weak self] in
+            guard let self = self, let recorder = self.recorder, recorder.isRecording else {
+                completion(self?.currentURL)
+                return
+            }
+
+            let item = DispatchWorkItem { [weak self] in
+                guard let self = self else { return }
+                recorder.stop()
+                self.cleanupSession()
+                let url = self.currentURL
+                self.recorder = nil
+                self.currentURL = url
+                completion(url)
+            }
+            self.stopWorkItem = item
+            self.queue.asyncAfter(deadline: .now() + self.paddingInterval, execute: item)
+        }
+    }
+
+    func cancelRecording() {
+        queue.async { [weak self] in
+            guard let self = self else { return }
+            self.stopWorkItem?.cancel()
+            self.stopWorkItem = nil
+            if let recorder = self.recorder, recorder.isRecording {
+                recorder.stop()
+            }
+            self.cleanupSession()
+            if let url = self.currentURL {
+                try? FileManager.default.removeItem(at: url)
+            }
+            self.recorder = nil
+            self.currentURL = nil
+        }
+    }
+
+    // MARK: - Metering
+
+    func currentAveragePower() -> Float {
+        queue.sync {
+            recorder?.updateMeters()
+            return recorder?.averagePower(forChannel: 0) ?? -160
+        }
+    }
+
+    // MARK: - Helpers
+
+    private func makeOutputURL() throws -> URL {
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyyMMdd_HHmmss"
+        let fileName = "voice_\(formatter.string(from: Date())).m4a"
+
+        let baseDirectory = try applicationFilesDirectory().appendingPathComponent("voicenotes/outgoing", isDirectory: true)
+        try FileManager.default.createDirectory(at: baseDirectory, withIntermediateDirectories: true, attributes: nil)
+        return baseDirectory.appendingPathComponent(fileName)
+    }
+
+    private func applicationFilesDirectory() throws -> URL {
+        #if os(iOS)
+        return try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+            .appendingPathComponent("files", isDirectory: true)
+        #else
+        let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+        return base.appendingPathComponent("files", isDirectory: true)
+        #endif
+    }
+
+    private func cleanupSession() {
+        #if os(iOS)
+        try? AVAudioSession.sharedInstance().setActive(false, options: .notifyOthersOnDeactivation)
+        #endif
+    }
+}

bitchat/Features/voice/Waveform.swift

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

bitchat/Info.plist

@@ -37,6 +37,10 @@
 	<string>bitchat uses Bluetooth to discover and connect with other bitchat users nearby.</string>
 	<key>NSCameraUsageDescription</key>
 	<string>bitchat uses the camera to scan QR codes to verify peers.</string>
+	<key>NSPhotoLibraryUsageDescription</key>
+	<string>bitchat lets you pick images from your photo library to share with nearby peers.</string>
+	<key>NSMicrophoneUsageDescription</key>
+	<string>bitchat uses the microphone to record voice notes that relay across the mesh.</string>
 	<key>NSLocationWhenInUseUsageDescription</key>
 	<string>bitchat uses your approximate location to compute local geohash channels for optional public chats. Exact GPS is never shared.</string>
 	<key>UIBackgroundModes</key>

bitchat/Models/BitchatPacket.swift

@@ -22,8 +22,8 @@ struct BitchatPacket: Codable {
     var signature: Data?
     var ttl: UInt8
     
-    init(type: UInt8, senderID: Data, recipientID: Data?, timestamp: UInt64, payload: Data, signature: Data?, ttl: UInt8) {
-        self.version = 1
+    init(type: UInt8, senderID: Data, recipientID: Data?, timestamp: UInt64, payload: Data, signature: Data?, ttl: UInt8, version: UInt8 = 1) {
+        self.version = version
         self.type = type
         self.senderID = senderID
         self.recipientID = recipientID
@@ -80,7 +80,8 @@ struct BitchatPacket: Codable {
             timestamp: timestamp,
             payload: payload,
             signature: nil, // Remove signature for signing
-            ttl: 0 // Use fixed TTL=0 for signing to ensure relay compatibility
+            ttl: 0, // Use fixed TTL=0 for signing to ensure relay compatibility
+            version: version
         )
         return BinaryProtocol.encode(unsignedPacket)
     }

bitchat/Models/PeerID.swift

@@ -161,9 +161,14 @@ extension PeerID {
                 id.rangeOfCharacter(from: validCharset.inverted) == nil
     }
     
+    /// Returns true if the `bare` id is all hex
+    var isHex: Bool {
+        bare.allSatisfy { $0.isHexDigit }
+    }
+    
     /// Short routing IDs (exact 16-hex)
     var isShort: Bool {
-        bare.count == Constants.hexIDLength && Data(hexString: bare) != nil
+        bare.count == Constants.hexIDLength && isHex
     }
     
     /// Full Noise key hex (exact 64-hex)

bitchat/Models/ReadReceipt.swift

@@ -11,11 +11,11 @@ import Foundation
 struct ReadReceipt: Codable {
     let originalMessageID: String
     let receiptID: String
-    var readerID: String  // Who read it
+    var readerID: PeerID  // Who read it
     let readerNickname: String
     let timestamp: Date
     
-    init(originalMessageID: String, readerID: String, readerNickname: String) {
+    init(originalMessageID: String, readerID: PeerID, readerNickname: String) {
         self.originalMessageID = originalMessageID
         self.receiptID = UUID().uuidString
         self.readerID = readerID
@@ -24,7 +24,7 @@ struct ReadReceipt: Codable {
     }
     
     // For binary decoding
-    private init(originalMessageID: String, receiptID: String, readerID: String, readerNickname: String, timestamp: Date) {
+    private init(originalMessageID: String, receiptID: String, readerID: PeerID, readerNickname: String, timestamp: Date) {
         self.originalMessageID = originalMessageID
         self.receiptID = receiptID
         self.readerID = readerID
@@ -48,7 +48,7 @@ struct ReadReceipt: Codable {
         data.appendUUID(receiptID)
         // ReaderID as 8-byte hex string
         var readerData = Data()
-        var tempID = readerID
+        var tempID = readerID.id
         while tempID.count >= 2 && readerData.count < 8 {
             let hexByte = String(tempID.prefix(2))
             if let byte = UInt8(hexByte, radix: 16) {
@@ -78,8 +78,8 @@ struct ReadReceipt: Codable {
               let receiptID = dataCopy.readUUID(at: &offset) else { return nil }
         
         guard let readerIDData = dataCopy.readFixedBytes(at: &offset, count: 8) else { return nil }
-        let readerID = readerIDData.hexEncodedString()
-        guard PeerID(str: readerID).isValid else { return nil }
+        let readerID = PeerID(hexData: readerIDData)
+        guard readerID.isValid else { return nil }
         
         guard let timestamp = dataCopy.readDate(at: &offset),
               InputValidator.validateTimestamp(timestamp),

bitchat/Noise/NoiseProtocol.swift

@@ -767,7 +767,7 @@ final class NoiseHandshakeState {
             let shared = try localStatic.sharedSecretFromKeyAgreement(with: remoteStatic)
             symmetricState.mixKey(shared.withUnsafeBytes { Data($0) })
             
-        default:
+        case .e, .s:
             break
         }
     }

bitchat/Noise/NoiseRateLimiter.swift

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

bitchat/Noise/NoiseSecurityConsiderations.swift

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

bitchat/Noise/NoiseSecurityConstants.swift

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

bitchat/Noise/NoiseSecurityError.swift

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

bitchat/Noise/NoiseSecurityValidator.swift

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

bitchat/Noise/NoiseSession.swift

@@ -196,12 +196,6 @@ class NoiseSession {
         }
     }
     
-    func getHandshakeHash() -> Data? {
-        return sessionQueue.sync {
-            return handshakeHash
-        }
-    }
-    
     func reset() {
         sessionQueue.sync(flags: .barrier) {
             let wasEstablished = state == .established

bitchat/Noise/NoiseSessionError.swift

@@ -6,10 +6,9 @@
 // For more information, see <https://unlicense.org>
 //
 
-enum NoiseSessionError: Error {
+enum NoiseSessionError: Error, Equatable {
     case invalidState
     case notEstablished
     case sessionNotFound
-    case handshakeFailed(Error)
     case alreadyEstablished
 }

bitchat/Noise/NoiseSessionManager.swift

@@ -27,19 +27,6 @@ final class NoiseSessionManager {
     
     // MARK: - Session Management
     
-    func createSession(for peerID: PeerID, role: NoiseRole) -> NoiseSession {
-        return managerQueue.sync(flags: .barrier) {
-            let session = SecureNoiseSession(
-                peerID: peerID,
-                role: role,
-                keychain: keychain,
-                localStaticKey: localStaticKey
-            )
-            sessions[peerID] = session
-            return session
-        }
-    }
-    
     func getSession(for peerID: PeerID) -> NoiseSession? {
         return managerQueue.sync {
             return sessions[peerID]
@@ -48,14 +35,9 @@ final class NoiseSessionManager {
     
     func removeSession(for peerID: PeerID) {
         managerQueue.sync(flags: .barrier) {
-            if let session = sessions[peerID] {
-                if session.isEstablished() {
-                    SecureLogger.info(.sessionExpired(peerID: peerID.id))
+            if let session = sessions.removeValue(forKey: peerID) {
+                session.reset() // Clear sensitive data before removing
             }
-                // Clear sensitive data before removing
-                session.reset()
-            }
-            _ = sessions.removeValue(forKey: peerID)
         }
     }
 
@@ -68,12 +50,6 @@ final class NoiseSessionManager {
         }
     }
     
-    func getEstablishedSessions() -> [PeerID: NoiseSession] {
-        return managerQueue.sync {
-            return sessions.filter { $0.value.isEstablished() }
-        }
-    }
-    
     // MARK: - Handshake Helpers
     
     func initiateHandshake(with peerID: PeerID) throws -> Data {
@@ -207,10 +183,6 @@ final class NoiseSessionManager {
         return getSession(for: peerID)?.getRemoteStaticPublicKey()
     }
     
-    func getHandshakeHash(for peerID: PeerID) -> Data? {
-        return getSession(for: peerID)?.getHandshakeHash()
-    }
-    
     // MARK: - Session Rekeying
     
     func getSessionsNeedingRekey() -> [(peerID: PeerID, needsRekey: Bool)] {

bitchat/Noise/SecureNoiseSession.swift

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

bitchat/Nostr/Bech32.swift

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

bitchat/Nostr/GeoRelayDirectory.swift

@@ -1,6 +1,11 @@
 import BitLogger
 import Foundation
 import Tor
+#if os(iOS)
+import UIKit
+#elseif os(macOS)
+import AppKit
+#endif
 
 /// Directory of online Nostr relays with approximate GPS locations, used for geohash routing.
 @MainActor
@@ -12,19 +17,32 @@ final class GeoRelayDirectory {
     }
 
     static let shared = GeoRelayDirectory()
+
     private(set) var entries: [Entry] = []
     private let cacheFileName = "georelays_cache.csv"
     private let lastFetchKey = "georelay.lastFetchAt"
     private let remoteURL = URL(string: "https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv")!
-    private let fetchInterval: TimeInterval = TransportConfig.geoRelayFetchIntervalSeconds // 24h
+    private let fetchInterval: TimeInterval = TransportConfig.geoRelayFetchIntervalSeconds
+
+    private var refreshTimer: Timer?
+    private var retryTask: Task<Void, Never>?
+    private var retryAttempt: Int = 0
+    private var isFetching: Bool = false
+    private var observers: [NSObjectProtocol] = []
 
     private init() {
-        // Load cached or bundled data synchronously
-        self.entries = self.loadLocalEntries()
-        // Fire-and-forget remote refresh if stale
+        entries = loadLocalEntries()
+        registerObservers()
+        startRefreshTimer()
         prefetchIfNeeded()
     }
 
+    deinit {
+        observers.forEach { NotificationCenter.default.removeObserver($0) }
+        refreshTimer?.invalidate()
+        retryTask?.cancel()
+    }
+
     /// Returns up to `count` relay URLs (wss://) closest to the geohash center.
     func closestRelays(toGeohash geohash: String, count: Int = 5) -> [String] {
         let center = Geohash.decodeCenter(geohash)
@@ -33,50 +51,146 @@ final class GeoRelayDirectory {
 
     /// Returns up to `count` relay URLs (wss://) closest to the given coordinate.
     func closestRelays(toLat lat: Double, lon: Double, count: Int = 5) -> [String] {
-        guard !entries.isEmpty else { return [] }
-        let sorted = entries
+        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)
                 }
-            .prefix(count)
-        return sorted.map { "wss://\($0.host)" }
+                .map { "wss://\($0.host)" }
+        }
+
+        var best: [(entry: Entry, distance: Double)] = []
+        best.reserveCapacity(count)
+
+        for entry in entries {
+            let distance = haversineKm(lat, lon, entry.lat, entry.lon)
+            if best.count < count {
+                let idx = best.firstIndex { $0.distance > distance } ?? best.count
+                best.insert((entry, distance), at: idx)
+            } else if let worstDistance = best.last?.distance, distance < worstDistance {
+                let idx = best.firstIndex { $0.distance > distance } ?? best.count
+                best.insert((entry, distance), at: idx)
+                best.removeLast()
+            }
+        }
+
+        return best.map { "wss://\($0.entry.host)" }
     }
 
     // MARK: - Remote Fetch
-    func prefetchIfNeeded() {
+    func prefetchIfNeeded(force: Bool = false) {
+        guard !isFetching else { return }
+
         let now = Date()
         let last = UserDefaults.standard.object(forKey: lastFetchKey) as? Date ?? .distantPast
+
+        if !force {
             guard now.timeIntervalSince(last) >= fetchInterval else { return }
+        } else if last != .distantPast,
+                  now.timeIntervalSince(last) < TransportConfig.geoRelayRetryInitialSeconds {
+            // Skip forced fetches if we just refreshed moments ago.
+            return
+        }
+
+        cancelRetry()
         fetchRemote()
     }
 
     private func fetchRemote() {
-        let req = URLRequest(url: remoteURL, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 15)
-        // Ensure Tor readiness before fetching (fail-closed by default)
-        Task.detached {
+        guard !isFetching else { return }
+        isFetching = true
+
+        let request = URLRequest(
+            url: remoteURL,
+            cachePolicy: .reloadIgnoringLocalCacheData,
+            timeoutInterval: 15
+        )
+
+        Task.detached { [weak self] in
+            guard let self else { return }
+
             let ready = await TorManager.shared.awaitReady()
             if !ready {
-                SecureLogger.warning("GeoRelayDirectory: Tor not ready; skipping remote fetch (fail-closed)", category: .session)
+                await self.handleFetchFailure(.torNotReady)
                 return
             }
-            let task = TorURLSession.shared.session.dataTask(with: req) { [weak self] data, _, error in
-                guard let self = self else { return }
-                if let data = data, error == nil, let text = String(data: data, encoding: .utf8) {
+
+            do {
+                let (data, _) = try await TorURLSession.shared.session.data(for: request)
+                guard let text = String(data: data, encoding: .utf8) else {
+                    await self.handleFetchFailure(.invalidData)
+                    return
+                }
+
                 let parsed = GeoRelayDirectory.parseCSV(text)
-                    if !parsed.isEmpty {
-                        Task { @MainActor in
-                            self.entries = parsed
-                            self.persistCache(text)
-                            UserDefaults.standard.set(Date(), forKey: self.lastFetchKey)
-                            SecureLogger.info("GeoRelayDirectory: refreshed \(parsed.count) relays from remote", category: .session)
-                        }
+                guard !parsed.isEmpty else {
+                    await self.handleFetchFailure(.invalidData)
                     return
                 }
+
+                await self.handleFetchSuccess(entries: parsed, csv: text)
+            } catch {
+                await self.handleFetchFailure(.network(error))
             }
-                SecureLogger.warning("GeoRelayDirectory: remote fetch failed; keeping local entries", category: .session)
         }
-            task.resume()
     }
+
+    private enum FetchFailure {
+        case torNotReady
+        case invalidData
+        case network(Error)
+    }
+
+    @MainActor
+    private func handleFetchSuccess(entries parsed: [Entry], csv: String) {
+        entries = parsed
+        persistCache(csv)
+        UserDefaults.standard.set(Date(), forKey: lastFetchKey)
+        SecureLogger.info("GeoRelayDirectory: refreshed \(parsed.count) relays from remote", category: .session)
+        isFetching = false
+        retryAttempt = 0
+        cancelRetry()
+    }
+
+    @MainActor
+    private func handleFetchFailure(_ reason: FetchFailure) {
+        switch reason {
+        case .torNotReady:
+            SecureLogger.warning("GeoRelayDirectory: Tor not ready; scheduling retry", category: .session)
+        case .invalidData:
+            SecureLogger.warning("GeoRelayDirectory: remote fetch returned invalid data; scheduling retry", category: .session)
+        case .network(let error):
+            SecureLogger.warning("GeoRelayDirectory: remote fetch failed with error: \(error.localizedDescription)", category: .session)
+        }
+        isFetching = false
+        scheduleRetry()
+    }
+
+    @MainActor
+    private func scheduleRetry() {
+        retryAttempt = min(retryAttempt + 1, 10)
+        let base = TransportConfig.geoRelayRetryInitialSeconds
+        let maxDelay = TransportConfig.geoRelayRetryMaxSeconds
+        let multiplier = pow(2.0, Double(max(retryAttempt - 1, 0)))
+        let calculated = base * multiplier
+        let delay = min(maxDelay, max(base, calculated))
+
+        cancelRetry()
+        retryTask = Task { [weak self] in
+            let nanoseconds = UInt64(delay * 1_000_000_000)
+            try? await Task.sleep(nanoseconds: nanoseconds)
+            await MainActor.run {
+                self?.prefetchIfNeeded(force: true)
+            }
+        }
+    }
+
+    @MainActor
+    private func cancelRetry() {
+        retryTask?.cancel()
+        retryTask = nil
     }
 
     private func persistCache(_ text: String) {
@@ -91,30 +205,35 @@ final class GeoRelayDirectory {
     // MARK: - Loading
     private func loadLocalEntries() -> [Entry] {
         // Prefer cached file if present
-        if let cache = self.cacheURL(),
+        if let cache = cacheURL(),
            let data = try? Data(contentsOf: cache),
            let text = String(data: data, encoding: .utf8) {
             let arr = Self.parseCSV(text)
             if !arr.isEmpty { return arr }
         }
+
         // Try bundled resource(s)
         let bundleCandidates = [
             Bundle.main.url(forResource: "nostr_relays", withExtension: "csv"),
             Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv"),
             Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv", subdirectory: "relays")
         ].compactMap { $0 }
+
         for url in bundleCandidates {
-            if let data = try? Data(contentsOf: url), let text = String(data: data, encoding: .utf8) {
+            if let data = try? Data(contentsOf: url),
+               let text = String(data: data, encoding: .utf8) {
                 let arr = Self.parseCSV(text)
                 if !arr.isEmpty { return arr }
             }
         }
+
         // Try filesystem path (development/test)
         if let cwd = FileManager.default.currentDirectoryPath as String?,
            let data = try? Data(contentsOf: URL(fileURLWithPath: cwd).appendingPathComponent("relays/online_relays_gps.csv")),
            let text = String(data: data, encoding: .utf8) {
             return Self.parseCSV(text)
         }
+
         SecureLogger.warning("GeoRelayDirectory: no local CSV found; entries empty", category: .session)
         return []
     }
@@ -122,7 +241,6 @@ final class GeoRelayDirectory {
     nonisolated static func parseCSV(_ text: String) -> [Entry] {
         var result: Set<Entry> = []
         let lines = text.split(whereSeparator: { $0.isNewline })
-        // Skip header if present
         for (idx, raw) in lines.enumerated() {
             let line = raw.trimmingCharacters(in: .whitespacesAndNewlines)
             if line.isEmpty { continue }
@@ -143,11 +261,67 @@ final class GeoRelayDirectory {
 
     private func cacheURL() -> URL? {
         do {
-            let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+            let base = try FileManager.default.url(
+                for: .applicationSupportDirectory,
+                in: .userDomainMask,
+                appropriateFor: nil,
+                create: true
+            )
             let dir = base.appendingPathComponent("bitchat", isDirectory: true)
             try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
             return dir.appendingPathComponent(cacheFileName)
-        } catch { return nil }
+        } catch {
+            return nil
+        }
+    }
+
+    // MARK: - Observers & Timers
+    private func registerObservers() {
+        let center = NotificationCenter.default
+
+        let torReady = center.addObserver(
+            forName: .TorDidBecomeReady,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            self?.prefetchIfNeeded(force: true)
+        }
+        observers.append(torReady)
+
+#if os(iOS)
+        let didBecomeActive = center.addObserver(
+            forName: UIApplication.didBecomeActiveNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            self?.prefetchIfNeeded()
+        }
+        observers.append(didBecomeActive)
+#elseif os(macOS)
+        let didBecomeActive = center.addObserver(
+            forName: NSApplication.didBecomeActiveNotification,
+            object: nil,
+            queue: .main
+        ) { [weak self] _ in
+            self?.prefetchIfNeeded()
+        }
+        observers.append(didBecomeActive)
+#endif
+    }
+
+    private func startRefreshTimer() {
+        refreshTimer?.invalidate()
+        let interval = TransportConfig.geoRelayRefreshCheckIntervalSeconds
+        guard interval > 0 else { return }
+
+        let timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { [weak self] _ in
+            guard let self else { return }
+            Task { @MainActor in
+                self.prefetchIfNeeded()
+            }
+        }
+        refreshTimer = timer
+        RunLoop.main.add(timer, forMode: .common)
     }
 }
 

bitchat/Nostr/KeychainHelper.swift

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

bitchat/Nostr/NostrEmbeddedBitChat.swift

@@ -4,7 +4,7 @@ import Foundation
 
 struct NostrEmbeddedBitChat {
     /// Build a `bitchat1:` base64url-encoded BitChat packet carrying a private message for Nostr DMs.
-    static func encodePMForNostr(content: String, messageID: String, recipientPeerID: String, senderPeerID: String) -> String? {
+    static func encodePMForNostr(content: String, messageID: String, recipientPeerID: PeerID, senderPeerID: PeerID) -> String? {
         // TLV-encode the private message
         let pm = PrivateMessagePacket(messageID: messageID, content: content)
         guard let tlv = pm.encode() else { return nil }
@@ -14,12 +14,12 @@ struct NostrEmbeddedBitChat {
         payload.append(tlv)
 
         // Determine 8-byte recipient ID to embed
-        let recipientIDHex: String = normalizeRecipientPeerID(recipientPeerID)
+        let recipientID = normalizeRecipientPeerID(recipientPeerID)
 
         let packet = BitchatPacket(
             type: MessageType.noiseEncrypted.rawValue,
-            senderID: Data(hexString: senderPeerID) ?? Data(),
-            recipientID: Data(hexString: recipientIDHex),
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: Data(hexString: recipientID.id),
             timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
             payload: payload,
             signature: nil,
@@ -31,18 +31,18 @@ struct NostrEmbeddedBitChat {
     }
 
     /// Build a `bitchat1:` base64url-encoded BitChat packet carrying a delivery/read ack for Nostr DMs.
-    static func encodeAckForNostr(type: NoisePayloadType, messageID: String, recipientPeerID: String, senderPeerID: String) -> String? {
+    static func encodeAckForNostr(type: NoisePayloadType, messageID: String, recipientPeerID: PeerID, senderPeerID: PeerID) -> String? {
         guard type == .delivered || type == .readReceipt else { return nil }
 
         var payload = Data([type.rawValue])
         payload.append(Data(messageID.utf8))
 
-        let recipientIDHex: String = normalizeRecipientPeerID(recipientPeerID)
+        let recipientID = normalizeRecipientPeerID(recipientPeerID)
 
         let packet = BitchatPacket(
             type: MessageType.noiseEncrypted.rawValue,
-            senderID: Data(hexString: senderPeerID) ?? Data(),
-            recipientID: Data(hexString: recipientIDHex),
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
+            recipientID: Data(hexString: recipientID.id),
             timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
             payload: payload,
             signature: nil,
@@ -54,7 +54,7 @@ struct NostrEmbeddedBitChat {
     }
 
     /// Build a `bitchat1:` ACK (delivered/read) without an embedded recipient peer ID (geohash DMs).
-    static func encodeAckForNostrNoRecipient(type: NoisePayloadType, messageID: String, senderPeerID: String) -> String? {
+    static func encodeAckForNostrNoRecipient(type: NoisePayloadType, messageID: String, senderPeerID: PeerID) -> String? {
         guard type == .delivered || type == .readReceipt else { return nil }
 
         var payload = Data([type.rawValue])
@@ -62,7 +62,7 @@ struct NostrEmbeddedBitChat {
 
         let packet = BitchatPacket(
             type: MessageType.noiseEncrypted.rawValue,
-            senderID: Data(hexString: senderPeerID) ?? Data(),
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
             recipientID: nil,
             timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
             payload: payload,
@@ -75,7 +75,7 @@ struct NostrEmbeddedBitChat {
     }
 
     /// Build a `bitchat1:` payload without an embedded recipient peer ID (used for geohash DMs).
-    static func encodePMForNostrNoRecipient(content: String, messageID: String, senderPeerID: String) -> String? {
+    static func encodePMForNostrNoRecipient(content: String, messageID: String, senderPeerID: PeerID) -> String? {
         let pm = PrivateMessagePacket(messageID: messageID, content: content)
         guard let tlv = pm.encode() else { return nil }
 
@@ -84,7 +84,7 @@ struct NostrEmbeddedBitChat {
 
         let packet = BitchatPacket(
             type: MessageType.noiseEncrypted.rawValue,
-            senderID: Data(hexString: senderPeerID) ?? Data(),
+            senderID: Data(hexString: senderPeerID.id) ?? Data(),
             recipientID: nil,
             timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
             payload: payload,
@@ -96,11 +96,11 @@ struct NostrEmbeddedBitChat {
         return "bitchat1:" + base64URLEncode(data)
     }
 
-    private static func normalizeRecipientPeerID(_ recipientPeerID: String) -> String {
-        if let maybeData = Data(hexString: recipientPeerID) {
+    private static func normalizeRecipientPeerID(_ recipientPeerID: PeerID) -> PeerID {
+        if let maybeData = Data(hexString: recipientPeerID.id) {
             if maybeData.count == 32 {
                 // Treat as Noise static public key; derive peerID from fingerprint
-                return PeerID(publicKey: maybeData).id
+                return PeerID(publicKey: maybeData)
             } else if maybeData.count == 8 {
                 // Already an 8-byte peer ID
                 return recipientPeerID

bitchat/Nostr/NostrIdentity.swift

@@ -1,50 +1,5 @@
 import Foundation
-import CryptoKit
 import P256K
-import Security
-
-// Keychain helper for secure storage
-struct KeychainHelper {
-    static func save(key: String, data: Data, service: String, accessible: CFString? = nil) {
-        var query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key,
-            kSecValueData as String: data
-        ]
-        if let accessible = accessible {
-            query[kSecAttrAccessible as String] = accessible
-        }
-        
-        SecItemDelete(query as CFDictionary)
-        SecItemAdd(query as CFDictionary, nil)
-    }
-    
-    static func load(key: String, service: String) -> Data? {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key,
-            kSecReturnData as String: true
-        ]
-        
-        var result: AnyObject?
-        let status = SecItemCopyMatching(query as CFDictionary, &result)
-        
-        guard status == errSecSuccess else { return nil }
-        return result as? Data
-    }
-    
-    static func delete(key: String, service: String) {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: service,
-            kSecAttrAccount as String: key
-        ]
-        
-        SecItemDelete(query as CFDictionary)
-    }
-}
 
 /// Manages Nostr identity (secp256k1 keypair) for NIP-17 private messaging
 struct NostrIdentity: Codable {
@@ -103,266 +58,3 @@ struct NostrIdentity: Codable {
         return publicKey.hexEncodedString()
     }
 }
-
-/// Bridge between Noise and Nostr identities
-struct NostrIdentityBridge {
-    private static let keychainService = "chat.bitchat.nostr"
-    private static let currentIdentityKey = "nostr-current-identity"
-    private static let deviceSeedKey = "nostr-device-seed"
-    // In-memory cache to avoid transient keychain access issues
-    private static var deviceSeedCache: Data?
-    
-    /// Get or create the current Nostr identity
-    static func getCurrentNostrIdentity() throws -> NostrIdentity? {
-        // Check if we already have a Nostr identity
-        if let existingData = KeychainHelper.load(key: currentIdentityKey, service: keychainService),
-           let identity = try? JSONDecoder().decode(NostrIdentity.self, from: existingData) {
-            return identity
-        }
-        
-        // Generate new Nostr identity
-        let nostrIdentity = try NostrIdentity.generate()
-        
-        // Store it
-        let data = try JSONEncoder().encode(nostrIdentity)
-        KeychainHelper.save(key: currentIdentityKey, data: data, service: keychainService)
-        
-        return nostrIdentity
-    }
-    
-    /// Associate a Nostr identity with a Noise public key (for favorites)
-    static func associateNostrIdentity(_ nostrPubkey: String, with noisePublicKey: Data) {
-        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
-        if let data = nostrPubkey.data(using: .utf8) {
-            KeychainHelper.save(key: key, data: data, service: keychainService)
-        }
-    }
-    
-    /// Get Nostr public key associated with a Noise public key
-    static func getNostrPublicKey(for noisePublicKey: Data) -> String? {
-        let key = "nostr-noise-\(noisePublicKey.base64EncodedString())"
-        guard let data = KeychainHelper.load(key: key, service: keychainService),
-              let pubkey = String(data: data, encoding: .utf8) else {
-            return nil
-        }
-        return pubkey
-    }
-    
-    /// Clear all Nostr identity associations and current identity
-    static func clearAllAssociations() {
-        let query: [String: Any] = [
-            kSecClass as String: kSecClassGenericPassword,
-            kSecAttrService as String: keychainService,
-            kSecMatchLimit as String: kSecMatchLimitAll,
-            kSecReturnAttributes as String: true
-        ]
-
-        var result: AnyObject?
-        let status = SecItemCopyMatching(query as CFDictionary, &result)
-        if status == errSecSuccess, let items = result as? [[String: Any]] {
-            for item in items {
-                var deleteQuery: [String: Any] = [
-                    kSecClass as String: kSecClassGenericPassword,
-                    kSecAttrService as String: keychainService
-                ]
-                if let account = item[kSecAttrAccount as String] as? String {
-                    deleteQuery[kSecAttrAccount as String] = account
-                }
-                SecItemDelete(deleteQuery as CFDictionary)
-            }
-        } else if status == errSecItemNotFound {
-            // nothing persisted; no action needed
-        }
-
-        deviceSeedCache = nil
-    }
-
-    // MARK: - Per-Geohash Identities (Location Channels)
-
-    /// Returns a stable device seed used to derive unlinkable per-geohash identities.
-    /// Stored only on device keychain.
-    private static func getOrCreateDeviceSeed() -> Data {
-        if let cached = deviceSeedCache { return cached }
-        if let existing = KeychainHelper.load(key: deviceSeedKey, service: keychainService) {
-            // Migrate to AfterFirstUnlockThisDeviceOnly for stability during lock
-            KeychainHelper.save(key: deviceSeedKey, data: existing, service: keychainService, accessible: kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly)
-            deviceSeedCache = existing
-            return existing
-        }
-        var seed = Data(count: 32)
-        _ = seed.withUnsafeMutableBytes { ptr in
-            SecRandomCopyBytes(kSecRandomDefault, 32, ptr.baseAddress!)
-        }
-        // Ensure availability after first unlock to prevent unintended rotation when locked
-        KeychainHelper.save(key: deviceSeedKey, data: seed, service: keychainService, accessible: kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly)
-        deviceSeedCache = seed
-        return seed
-    }
-
-    /// Derive a deterministic, unlinkable Nostr identity for a given geohash.
-    /// Uses HMAC-SHA256(deviceSeed, geohash) as private key material, with fallback rehashing
-    /// if the candidate is not a valid secp256k1 private key.
-    static func deriveIdentity(forGeohash geohash: String) throws -> NostrIdentity {
-        let seed = getOrCreateDeviceSeed()
-        guard let msg = geohash.data(using: .utf8) else {
-            throw NSError(domain: "NostrIdentity", code: -1, userInfo: [NSLocalizedDescriptionKey: "Invalid geohash string"])
-        }
-
-        func candidateKey(iteration: UInt32) -> Data {
-            var input = Data(msg)
-            var iterBE = iteration.bigEndian
-            withUnsafeBytes(of: &iterBE) { bytes in
-                input.append(contentsOf: bytes)
-            }
-            let code = CryptoKit.HMAC<CryptoKit.SHA256>.authenticationCode(for: input, using: SymmetricKey(data: seed))
-            return Data(code)
-        }
-
-        // Try a few iterations to ensure a valid key can be formed
-        for i in 0..<10 {
-            let keyData = candidateKey(iteration: UInt32(i))
-            if let identity = try? NostrIdentity(privateKeyData: keyData) {
-                return identity
-            }
-        }
-        // As a final fallback, hash the seed+msg and try again
-        let fallback = (seed + msg).sha256Hash()
-        return try NostrIdentity(privateKeyData: fallback)
-    }
-}
-
-// Bech32 encoding for Nostr (minimal implementation)
-enum Bech32 {
-    private static let charset = "qpzry9x8gf2tvdw0s3jn54khce6mua7l"
-    private static let generator = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3]
-    
-    static func encode(hrp: String, data: Data) throws -> String {
-        let values = convertBits(from: 8, to: 5, pad: true, data: Array(data))
-        let checksum = createChecksum(hrp: hrp, values: values)
-        let combined = values + checksum
-        
-        return hrp + "1" + combined.map { 
-            let index = charset.index(charset.startIndex, offsetBy: Int($0))
-            return String(charset[index])
-        }.joined()
-    }
-    
-    static func decode(_ bech32String: String) throws -> (hrp: String, data: Data) {
-        // Find the last occurrence of '1'
-        guard let separatorIndex = bech32String.lastIndex(of: "1") else {
-            throw Bech32Error.invalidFormat
-        }
-        
-        let hrp = String(bech32String[..<separatorIndex])
-        
-        // Validate HRP contains only ASCII characters
-        for char in hrp {
-            guard char.asciiValue != nil else {
-                throw Bech32Error.invalidCharacter
-            }
-        }
-        
-        let dataString = String(bech32String[bech32String.index(after: separatorIndex)...])
-        
-        // Convert characters to values
-        var values = [UInt8]()
-        for char in dataString {
-            guard let index = charset.firstIndex(of: char) else {
-                throw Bech32Error.invalidCharacter
-            }
-            values.append(UInt8(charset.distance(from: charset.startIndex, to: index)))
-        }
-        
-        // Verify checksum
-        guard values.count >= 6 else {
-            throw Bech32Error.invalidChecksum
-        }
-        
-        let payloadValues = Array(values.dropLast(6))
-        let checksum = Array(values.suffix(6))
-        let expectedChecksum = createChecksum(hrp: hrp, values: payloadValues)
-        
-        guard checksum == expectedChecksum else {
-            throw Bech32Error.invalidChecksum
-        }
-        
-        // Convert back to bytes
-        let bytes = convertBits(from: 5, to: 8, pad: false, data: payloadValues)
-        return (hrp: hrp, data: Data(bytes))
-    }
-    
-    enum Bech32Error: Error {
-        case invalidFormat
-        case invalidCharacter
-        case invalidChecksum
-    }
-    
-    private static func convertBits(from: Int, to: Int, pad: Bool, data: [UInt8]) -> [UInt8] {
-        var acc = 0
-        var bits = 0
-        var result = [UInt8]()
-        let maxv = (1 << to) - 1
-        
-        for value in data {
-            acc = (acc << from) | Int(value)
-            bits += from
-            
-            while bits >= to {
-                bits -= to
-                result.append(UInt8((acc >> bits) & maxv))
-            }
-        }
-        
-        if pad && bits > 0 {
-            result.append(UInt8((acc << (to - bits)) & maxv))
-        }
-        
-        return result
-    }
-    
-    private static func createChecksum(hrp: String, values: [UInt8]) -> [UInt8] {
-        let checksumValues = hrpExpand(hrp) + values + [0, 0, 0, 0, 0, 0]
-        let polymod = polymod(checksumValues) ^ 1
-        var checksum = [UInt8]()
-        
-        for i in 0..<6 {
-            checksum.append(UInt8((polymod >> (5 * (5 - i))) & 31))
-        }
-        
-        return checksum
-    }
-    
-    private static func hrpExpand(_ hrp: String) -> [UInt8] {
-        var result = [UInt8]()
-        for c in hrp {
-            guard let asciiValue = c.asciiValue else {
-                return [] // Return empty array for invalid input
-            }
-            result.append(UInt8(asciiValue >> 5))
-        }
-        result.append(0)
-        for c in hrp {
-            guard let asciiValue = c.asciiValue else {
-                return [] // Return empty array for invalid input
-            }
-            result.append(UInt8(asciiValue & 31))
-        }
-        return result
-    }
-    
-    private static func polymod(_ values: [UInt8]) -> Int {
-        var chk = 1
-        for value in values {
-            let b = chk >> 25
-            chk = (chk & 0x1ffffff) << 5 ^ Int(value)
-            for i in 0..<5 {
-                if (b >> i) & 1 == 1 {
-                    chk ^= generator[i]
-                }
-            }
-        }
-        return chk
-    }
-}
-
-// Data hex encoding extension moved to BinaryEncodingUtils.swift to avoid duplication

bitchat/Nostr/NostrIdentityBridge.swift

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

bitchat/Nostr/NostrRelayManager.swift

@@ -906,6 +906,16 @@ struct NostrFilter: Encodable {
         filter.limit = limit
         return filter
     }
+
+    // For location notes with neighbors: subscribe to multiple geohashes (center + neighbors)
+    static func geohashNotes(_ geohashes: [String], since: Date? = nil, limit: Int = 200) -> NostrFilter {
+        var filter = NostrFilter()
+        filter.kinds = [1]
+        filter.since = since?.timeIntervalSince1970.toInt()
+        filter.tagFilters = ["g": geohashes]
+        filter.limit = limit
+        return filter
+    }
 }
 
 // Dynamic coding key for tag filters

bitchat/Protocols/BinaryEncodingUtils.swift

@@ -6,6 +6,7 @@
 //
 
 import Foundation
+import CryptoKit
 
 // MARK: - Hex Encoding/Decoding
 
@@ -17,6 +18,11 @@ extension Data {
         return self.map { String(format: "%02x", $0) }.joined()
     }
 
+    func sha256Hex() -> String {
+        let digest = SHA256.hash(data: self)
+        return digest.map { String(format: "%02x", $0) }.joined()
+    }
+    
     init?(hexString: String) {
         let len = hexString.count / 2
         var data = Data(capacity: len)

bitchat/Protocols/BinaryProtocol.swift

@@ -22,11 +22,11 @@
 ///
 /// ## Wire Format
 /// ```
-/// Header (Fixed 13 bytes):
-/// +--------+------+-----+-----------+-------+----------------+
+/// Header (Fixed 14 bytes for v1, 16 bytes for v2):
+/// +--------+------+-----+-----------+-------+------------------+
 /// |Version | Type | TTL | Timestamp | Flags | PayloadLength    |
-/// |1 byte  |1 byte|1byte| 8 bytes   | 1 byte| 2 bytes        |
-/// +--------+------+-----+-----------+-------+----------------+
+/// |1 byte  |1 byte|1byte| 8 bytes   | 1 byte| 2 or 4 bytes     |
+/// +--------+------+-----+-----------+-------+------------------+
 ///
 /// Variable sections:
 /// +----------+-------------+---------+------------+
@@ -52,7 +52,7 @@
 /// ## Flag Bits
 /// - Bit 0: Has recipient ID (directed message)
 /// - Bit 1: Has signature (authenticated message)
-/// - Bit 2: Is compressed (LZ4 compression applied)
+/// - Bit 2: Is compressed (zlib compression applied)
 /// - Bits 3-7: Reserved for future use
 ///
 /// ## Size Constraints
@@ -89,6 +89,7 @@
 ///
 
 import Foundation
+import BitLogger
 
 extension Data {
     func trimmingNullBytes() -> Data {
@@ -105,11 +106,33 @@ extension Data {
 /// their binary wire format representation.
 /// - Note: All multi-byte values use network byte order (big-endian)
 struct BinaryProtocol {
-    static let headerSize = 13
+    static let v1HeaderSize = 14
+    static let v2HeaderSize = 16
     static let senderIDSize = 8
     static let recipientIDSize = 8
     static let signatureSize = 64
 
+    // Field offsets within packet header
+    struct Offsets {
+        static let version = 0
+        static let type = 1
+        static let ttl = 2
+        static let timestamp = 3
+        static let flags = 11  // After version(1) + type(1) + ttl(1) + timestamp(8)
+    }
+
+    static func headerSize(for version: UInt8) -> Int? {
+        switch version {
+        case 1: return v1HeaderSize
+        case 2: return v2HeaderSize
+        default: return nil
+        }
+    }
+
+    private static func lengthFieldSize(for version: UInt8) -> Int {
+        return version == 2 ? 4 : 2
+    }
+    
     struct Flags {
         static let hasRecipient: UInt8 = 0x01
         static let hasSignature: UInt8 = 0x02
@@ -118,70 +141,69 @@ struct BinaryProtocol {
     
     // Encode BitchatPacket to binary format
     static func encode(_ packet: BitchatPacket, padding: Bool = true) -> Data? {
-        var data = Data()
+        let version = packet.version
+        guard version == 1 || version == 2 else { return nil }
 
-        
-        // Try to compress payload if beneficial
+        // Try to compress payload when beneficial, keeping original size for later decoding
         var payload = packet.payload
-        var originalPayloadSize: UInt16? = nil
         var isCompressed = false
-        
+        var originalPayloadSize: Int?
         if CompressionUtil.shouldCompress(payload) {
-            if let compressedPayload = CompressionUtil.compress(payload) {
-                // Store original size for decompression (2 bytes after payload)
-                originalPayloadSize = UInt16(payload.count)
+            // Only compress when we can represent the original length in the outbound frame
+            let maxRepresentable = version == 2 ? Int(UInt32.max) : Int(UInt16.max)
+            if payload.count <= maxRepresentable,
+               let compressedPayload = CompressionUtil.compress(payload) {
+                originalPayloadSize = payload.count
                 payload = compressedPayload
                 isCompressed = true
-                
-            } else {
             }
-        } else {
         }
 
-        // Header
-        // Reserve capacity to reduce reallocations. Estimate base size conservatively.
-        // header(13) + sender(8) + opt recipient(8) + opt originalSize(2) + payload + opt signature(64) + up to 255 pad
-        let estimatedPayload = payload.count + (isCompressed ? 2 : 0)
-        let estimated = headerSize + senderIDSize + (packet.recipientID == nil ? 0 : recipientIDSize) + estimatedPayload + (packet.signature == nil ? 0 : signatureSize) + 255
-        data.reserveCapacity(estimated)
-        data.append(packet.version)
+        let lengthFieldBytes = lengthFieldSize(for: version)
+        let originalSizeFieldBytes = isCompressed ? lengthFieldBytes : 0
+        let payloadDataSize = payload.count + originalSizeFieldBytes
+
+        if version == 1 && payloadDataSize > Int(UInt16.max) { return nil }
+        if version == 2 && payloadDataSize > Int(UInt32.max) { return nil }
+
+        guard let headerSize = headerSize(for: version) else { return nil }
+        let estimatedHeader = headerSize + senderIDSize + (packet.recipientID == nil ? 0 : recipientIDSize)
+        let estimatedPayload = payloadDataSize
+        let estimatedSignature = (packet.signature == nil ? 0 : signatureSize)
+        var data = Data()
+        data.reserveCapacity(estimatedHeader + estimatedPayload + estimatedSignature + 255)
+
+        data.append(version)
         data.append(packet.type)
         data.append(packet.ttl)
 
-        // Timestamp (8 bytes, big-endian)
-        for i in (0..<8).reversed() {
-            data.append(UInt8((packet.timestamp >> (i * 8)) & 0xFF))
+        for shift in stride(from: 56, through: 0, by: -8) {
+            data.append(UInt8((packet.timestamp >> UInt64(shift)) & 0xFF))
         }
 
-        // Flags
         var flags: UInt8 = 0
-        if packet.recipientID != nil {
-            flags |= Flags.hasRecipient
-        }
-        if packet.signature != nil {
-            flags |= Flags.hasSignature
-        }
-        if isCompressed {
-            flags |= Flags.isCompressed
-        }
+        if packet.recipientID != nil { flags |= Flags.hasRecipient }
+        if packet.signature != nil { flags |= Flags.hasSignature }
+        if isCompressed { flags |= Flags.isCompressed }
         data.append(flags)
 
-        // Payload length (2 bytes, big-endian) - includes original size if compressed
-        let payloadDataSize = payload.count + (isCompressed ? 2 : 0)
-        let payloadLength = UInt16(payloadDataSize)
+        if version == 2 {
+            let length = UInt32(payloadDataSize)
+            for shift in stride(from: 24, through: 0, by: -8) {
+                data.append(UInt8((length >> UInt32(shift)) & 0xFF))
+            }
+        } else {
+            let length = UInt16(payloadDataSize)
+            data.append(UInt8((length >> 8) & 0xFF))
+            data.append(UInt8(length & 0xFF))
+        }
 
-        
-        data.append(UInt8((payloadLength >> 8) & 0xFF))
-        data.append(UInt8(payloadLength & 0xFF))
-        
-        // SenderID (exactly 8 bytes)
         let senderBytes = packet.senderID.prefix(senderIDSize)
         data.append(senderBytes)
         if senderBytes.count < senderIDSize {
             data.append(Data(repeating: 0, count: senderIDSize - senderBytes.count))
         }
 
-        // RecipientID (if present)
         if let recipientID = packet.recipientID {
             let recipientBytes = recipientID.prefix(recipientIDSize)
             data.append(recipientBytes)
@@ -190,29 +212,29 @@ struct BinaryProtocol {
             }
         }
 
-        // Payload (with original size prepended if compressed)
         if isCompressed, let originalSize = originalPayloadSize {
-            // Prepend original size (2 bytes, big-endian)
-            data.append(UInt8((originalSize >> 8) & 0xFF))
-            data.append(UInt8(originalSize & 0xFF))
+            if version == 2 {
+                let value = UInt32(originalSize)
+                for shift in stride(from: 24, through: 0, by: -8) {
+                    data.append(UInt8((value >> UInt32(shift)) & 0xFF))
+                }
+            } else {
+                let value = UInt16(originalSize)
+                data.append(UInt8((value >> 8) & 0xFF))
+                data.append(UInt8(value & 0xFF))
+            }
         }
         data.append(payload)
 
-        // Signature (if present)
         if let signature = packet.signature {
             data.append(signature.prefix(signatureSize))
         }
 
-        
-        // Apply padding to standard block sizes for traffic analysis resistance
         if padding {
             let optimalSize = MessagePadding.optimalBlockSize(for: data.count)
-            let paddedData = MessagePadding.pad(data, toSize: optimalSize)
-            return paddedData
-        } else {
-            // Caller explicitly requested no padding (e.g., BLE write path)
-            return data
+            return MessagePadding.pad(data, toSize: optimalSize)
         }
+        return data
     }
     
     // Decode binary data to BitchatPacket
@@ -227,87 +249,113 @@ struct BinaryProtocol {
 
     // Core decoding implementation used by decode(_:) with and without padding removal
     private static func decodeCore(_ raw: Data) -> BitchatPacket? {
-        // Minimum size: header + senderID
-        guard raw.count >= headerSize + senderIDSize else { return nil }
+        guard raw.count >= v1HeaderSize + senderIDSize else { return nil }
 
         return raw.withUnsafeBytes { (buf: UnsafeRawBufferPointer) -> BitchatPacket? in
             guard let base = buf.baseAddress else { return nil }
             var offset = 0
             func require(_ n: Int) -> Bool { offset + n <= buf.count }
-            // Read single byte
             func read8() -> UInt8? {
                 guard require(1) else { return nil }
-                let v = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self).pointee
+                let value = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self).pointee
                 offset += 1
-                return v
+                return value
             }
-            // Read big-endian 16-bit
             func read16() -> UInt16? {
                 guard require(2) else { return nil }
-                let p = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self)
-                let v = (UInt16(p[0]) << 8) | UInt16(p[1])
+                let ptr = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self)
+                let value = (UInt16(ptr[0]) << 8) | UInt16(ptr[1])
                 offset += 2
-                return v
+                return value
+            }
+            func read32() -> UInt32? {
+                guard require(4) else { return nil }
+                let ptr = base.advanced(by: offset).assumingMemoryBound(to: UInt8.self)
+                let value = (UInt32(ptr[0]) << 24) | (UInt32(ptr[1]) << 16) | (UInt32(ptr[2]) << 8) | UInt32(ptr[3])
+                offset += 4
+                return value
             }
-            // Copy N bytes into Data
             func readData(_ n: Int) -> Data? {
                 guard require(n) else { return nil }
                 let ptr = base.advanced(by: offset)
-                let d = Data(bytes: ptr, count: n)
+                let data = Data(bytes: ptr, count: n)
                 offset += n
-                return d
+                return data
             }
 
-            // Version
-            guard let version = read8(), version == 1 else { return nil }
-            guard let type = read8() else { return nil }
-            guard let ttl = read8() else { return nil }
+            guard let version = read8(), version == 1 || version == 2 else { return nil }
+            let lengthFieldBytes = lengthFieldSize(for: version)
+            guard let headerSize = headerSize(for: version) else { return nil }
+            let minimumRequired = headerSize + senderIDSize
+            guard raw.count >= minimumRequired else { return nil }
 
-            // Timestamp 8 bytes BE
-            guard require(8) else { return nil }
-            var ts: UInt64 = 0
+            guard let type = read8(), let ttl = read8() else { return nil }
+
+            var timestamp: UInt64 = 0
             for _ in 0..<8 {
-                guard let b = read8() else { return nil }
-                ts = (ts << 8) | UInt64(b)
+                guard let byte = read8() else { return nil }
+                timestamp = (timestamp << 8) | UInt64(byte)
             }
 
-            // Flags
             guard let flags = read8() else { return nil }
             let hasRecipient = (flags & Flags.hasRecipient) != 0
             let hasSignature = (flags & Flags.hasSignature) != 0
             let isCompressed = (flags & Flags.isCompressed) != 0
 
-            // Payload length
-            guard let payloadLen = read16(), payloadLen <= 65535 else { return nil }
+            let payloadLength: Int
+            if version == 2 {
+                guard let len = read32() else { return nil }
+                payloadLength = Int(len)
+            } else {
+                guard let len = read16() else { return nil }
+                payloadLength = Int(len)
+            }
+
+            guard payloadLength >= 0 else { return nil }
 
-            // SenderID
             guard let senderID = readData(senderIDSize) else { return nil }
 
-            // Recipient
             var recipientID: Data? = nil
             if hasRecipient {
                 recipientID = readData(recipientIDSize)
                 if recipientID == nil { return nil }
             }
 
-            // Payload
             let payload: Data
             if isCompressed {
-                // Need original size (2 bytes)
-                guard let origSize16 = read16() else { return nil }
-                let originalSize = Int(origSize16)
-                guard originalSize >= 0 && originalSize <= 1_048_576 else { return nil }
-                let compSize = Int(payloadLen) - 2
-                guard compSize >= 0, let compressed = readData(compSize) else { return nil }
+                guard payloadLength >= lengthFieldBytes else { return nil }
+                let originalSize: Int
+                if version == 2 {
+                    guard let rawSize = read32() else { return nil }
+                    originalSize = Int(rawSize)
+                } else {
+                    guard let rawSize = read16() else { return nil }
+                    originalSize = Int(rawSize)
+                }
+                // Guard to keep decompression bounded to sane BLE payload limits
+                // Use maxFramedFileBytes to account for TLV overhead in file transfer payloads
+                guard originalSize >= 0 && originalSize <= FileTransferLimits.maxFramedFileBytes else { return nil }
+                let compressedSize = payloadLength - lengthFieldBytes
+                guard compressedSize >= 0, let compressed = readData(compressedSize) else { return nil }
+
+                // Validate compression ratio to prevent zip bomb attacks
+                // Primary protection: originalSize capped at 1MB (line 336)
+                // Defense-in-depth: reject extreme ratios (prevents DoS via memory allocation)
+                guard compressedSize > 0 else { return nil }
+                let compressionRatio = Double(originalSize) / Double(compressedSize)
+                guard compressionRatio <= 50_000.0 else {
+                    SecureLogger.warning("🚫 Suspicious compression ratio: \(String(format: "%.0f", compressionRatio)):1", category: .security)
+                    return nil
+                }
+
                 guard let decompressed = CompressionUtil.decompress(compressed, originalSize: originalSize),
                       decompressed.count == originalSize else { return nil }
                 payload = decompressed
             } else {
-                guard let p = readData(Int(payloadLen)) else { return nil }
-                payload = p
+                guard let rawPayload = readData(payloadLength) else { return nil }
+                payload = rawPayload
             }
 
-            // Signature
             var signature: Data? = nil
             if hasSignature {
                 signature = readData(signatureSize)
@@ -320,10 +368,11 @@ struct BinaryProtocol {
                 type: type,
                 senderID: senderID,
                 recipientID: recipientID,
-                timestamp: ts,
+                timestamp: timestamp,
                 payload: payload,
                 signature: signature,
-                ttl: ttl
+                ttl: ttl,
+                version: version
             )
         }
     }

bitchat/Protocols/BitchatFilePacket.swift

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

bitchat/Protocols/BitchatProtocol.swift

@@ -79,6 +79,7 @@ enum MessageType: UInt8 {
     
     // Fragmentation (simplified)
     case fragment = 0x20        // Single fragment type for large messages
+    case fileTransfer = 0x22    // Binary file/audio/image payloads
     
     var description: String {
         switch self {
@@ -89,6 +90,7 @@ enum MessageType: UInt8 {
         case .noiseHandshake: return "noiseHandshake"
         case .noiseEncrypted: return "noiseEncrypted"
         case .fragment: return "fragment"
+        case .fileTransfer: return "fileTransfer"
         }
     }
 }
@@ -160,7 +162,6 @@ enum DeliveryStatus: Codable, Equatable, Hashable {
 
 // MARK: - Delegate Protocol
 
-@MainActor
 protocol BitchatDelegate: AnyObject {
     func didReceiveMessage(_ message: BitchatMessage)
     func didConnectToPeer(_ peerID: PeerID)
@@ -181,7 +182,6 @@ protocol BitchatDelegate: AnyObject {
 }
 
 // Provide default implementation to make it effectively optional
-@MainActor
 extension BitchatDelegate {
     func isFavorite(fingerprint: String) -> Bool {
         return false

bitchat/Protocols/Geohash.swift

@@ -119,4 +119,57 @@ enum Geohash {
         }
         return (latInterval.0, latInterval.1, lonInterval.0, lonInterval.1)
     }
+
+    /// Returns all 8 neighboring geohash cells at the same precision.
+    /// - Parameter geohash: Base32 geohash string.
+    /// - Returns: Array of 8 neighboring geohashes (N, NE, E, SE, S, SW, W, NW order).
+    static func neighbors(of geohash: String) -> [String] {
+        guard !geohash.isEmpty else { return [] }
+
+        let precision = geohash.count
+        let bounds = decodeBounds(geohash)
+        let center = decodeCenter(geohash)
+
+        // Calculate cell dimensions
+        let latHeight = bounds.latMax - bounds.latMin
+        let lonWidth = bounds.lonMax - bounds.lonMin
+
+        // Helper to wrap longitude around ±180
+        func wrapLongitude(_ lon: Double) -> Double {
+            var wrapped = lon
+            while wrapped > 180.0 { wrapped -= 360.0 }
+            while wrapped < -180.0 { wrapped += 360.0 }
+            return wrapped
+        }
+
+        // Helper to clamp latitude to ±90
+        func clampLatitude(_ lat: Double) -> Double {
+            return max(-90.0, min(90.0, lat))
+        }
+
+        // Calculate 8 neighbor centers
+        let neighbors: [(lat: Double, lon: Double)] = [
+            (center.lat + latHeight, center.lon),                    // N
+            (center.lat + latHeight, center.lon + lonWidth),         // NE
+            (center.lat, center.lon + lonWidth),                     // E
+            (center.lat - latHeight, center.lon + lonWidth),         // SE
+            (center.lat - latHeight, center.lon),                    // S
+            (center.lat - latHeight, center.lon - lonWidth),         // SW
+            (center.lat, center.lon - lonWidth),                     // W
+            (center.lat + latHeight, center.lon - lonWidth)          // NW
+        ]
+
+        // Encode each neighbor, handling boundary conditions
+        return neighbors.compactMap { neighbor in
+            let lat = clampLatitude(neighbor.lat)
+            let lon = wrapLongitude(neighbor.lon)
+
+            // Skip if we've crossed a pole (latitude clamped to boundary)
+            if (neighbor.lat > 90.0 || neighbor.lat < -90.0) {
+                return nil
+            }
+
+            return encode(latitude: lat, longitude: lon, precision: precision)
+        }
+    }
 }

bitchat/Services/CommandProcessor.swift

@@ -42,7 +42,7 @@ final class CommandProcessor {
             case .location: return true
             }
         }()
-        let inGeoDM = (chatViewModel?.selectedPrivateChatPeer?.hasPrefix("nostr_") == true)
+        let inGeoDM = chatViewModel?.selectedPrivateChatPeer?.isGeoDM == true
 
         switch cmd {
         case "/m", "/msg":
@@ -65,9 +65,6 @@ final class CommandProcessor {
         case "/unfav":
             if inGeoPublic || inGeoDM { return .error(message: "favorites are only for mesh peers in #mesh") }
             return handleFavorite(args, add: false)
-        //
-        case "/help", "/h":
-            return .error(message: "unknown command: \(cmd)")
         default:
             return .error(message: "unknown command: \(cmd)")
         }
@@ -104,7 +101,7 @@ final class CommandProcessor {
         case .location(let ch):
             // Geohash context: show visible geohash participants (exclude self)
             guard let vm = chatViewModel else { return .success(message: "nobody around") }
-            let myHex = (try? NostrIdentityBridge.deriveIdentity(forGeohash: ch.geohash))?.publicKeyHex.lowercased()
+            let myHex = (try? chatViewModel?.idBridge.deriveIdentity(forGeohash: ch.geohash))?.publicKeyHex.lowercased()
             let people = vm.visibleGeohashPeople().filter { person in
                 if let me = myHex { return person.id.lowercased() != me }
                 return true
@@ -148,9 +145,9 @@ final class CommandProcessor {
         
         if chatViewModel?.selectedPrivateChatPeer != nil {
             // In private chat
-            if let peerNickname = meshService?.peerNickname(peerID: PeerID(str: targetPeerID)) {
+            if let peerNickname = meshService?.peerNickname(peerID: targetPeerID) {
                 let personalMessage = "* \(emoji) \(myNickname) \(action) you\(suffix) *"
-                meshService?.sendPrivateMessage(personalMessage, to: PeerID(str: targetPeerID),
+                meshService?.sendPrivateMessage(personalMessage, to: targetPeerID,
                                                recipientNickname: peerNickname,
                                                messageID: UUID().uuidString)
                 // Also add a local system message so the sender sees a natural-language confirmation
@@ -214,7 +211,7 @@ final class CommandProcessor {
         let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
         
         if let peerID = chatViewModel?.getPeerIDForNickname(nickname),
-           let fingerprint = meshService?.getFingerprint(for: PeerID(str: peerID)) {
+           let fingerprint = meshService?.getFingerprint(for: peerID) {
             if identityManager.isBlocked(fingerprint: fingerprint) {
                 return .success(message: "\(nickname) is already blocked")
             }
@@ -258,7 +255,7 @@ final class CommandProcessor {
         let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
         
         if let peerID = chatViewModel?.getPeerIDForNickname(nickname),
-           let fingerprint = meshService?.getFingerprint(for: PeerID(str: peerID)) {
+           let fingerprint = meshService?.getFingerprint(for: peerID) {
             if !identityManager.isBlocked(fingerprint: fingerprint) {
                 return .success(message: "\(nickname) is not blocked")
             }
@@ -285,7 +282,7 @@ final class CommandProcessor {
         let nickname = targetName.hasPrefix("@") ? String(targetName.dropFirst()) : targetName
         
         guard let peerID = chatViewModel?.getPeerIDForNickname(nickname),
-              let noisePublicKey = Data(hexString: peerID) else {
+              let noisePublicKey = Data(hexString: peerID.id) else {
             return .error(message: "can't find peer: \(nickname)")
         }
         
@@ -311,19 +308,4 @@ final class CommandProcessor {
         }
     }
     
-    private func handleHelp() -> CommandResult {
-        let helpText = """
-        commands:
-        /msg @name - start private chat
-        /who - list who's online
-        /clear - clear messages
-        /hug @name - send a hug
-        /slap @name - slap with a trout
-        /fav @name - add to favorites
-        /unfav @name - remove from favorites
-        /block @name - block
-        /unblock @name - unblock
-        """
-        return .success(message: helpText)
-    }
 }

bitchat/Services/FavoritesPersistenceService.swift

@@ -26,6 +26,7 @@ final class FavoritesPersistenceService: ObservableObject {
 
     private static let storageKey = "chat.bitchat.favorites"
     private static let keychainService = "chat.bitchat.favorites"
+    private let keychain: KeychainHelperProtocol
     
     @Published private(set) var favorites: [Data: FavoriteRelationship] = [:] // Noise pubkey -> relationship
     @Published private(set) var mutualFavorites: Set<Data> = []
@@ -35,7 +36,8 @@ final class FavoritesPersistenceService: ObservableObject {
     
     static let shared = FavoritesPersistenceService()
     
-    private init() {
+    init(keychain: KeychainHelperProtocol = KeychainHelper()) {
+        self.keychain = keychain
         loadFavorites()
         
         // Update mutual favorites when favorites change
@@ -196,7 +198,7 @@ final class FavoritesPersistenceService: ObservableObject {
         saveFavorites()
         
         // Delete from keychain directly
-        KeychainHelper.delete(
+        keychain.delete(
             key: Self.storageKey,
             service: Self.keychainService
         )
@@ -216,10 +218,11 @@ final class FavoritesPersistenceService: ObservableObject {
             let data = try encoder.encode(relationships)
             
             // Store in keychain for security
-            KeychainHelper.save(
+            keychain.save(
                 key: Self.storageKey,
                 data: data,
-                service: Self.keychainService
+                service: Self.keychainService,
+                accessible: nil
             )
             
             // Successfully saved favorites
@@ -231,7 +234,7 @@ final class FavoritesPersistenceService: ObservableObject {
     private func loadFavorites() {
         // Loading favorites from keychain
         
-        guard let data = KeychainHelper.load(
+        guard let data = keychain.load(
             key: Self.storageKey,
             service: Self.keychainService
         ) else { 

bitchat/Services/GeohashBookmarksStore.swift

@@ -216,15 +216,4 @@ final class GeohashBookmarksStore: ObservableObject {
         }
     }
     #endif
-
-    #if DEBUG
-    /// Testing-only reset helper
-    func _resetForTesting() {
-        bookmarks.removeAll()
-        membership.removeAll()
-        bookmarkNames.removeAll()
-        persist()
-        persistNames()
-    }
-    #endif
 }

bitchat/Services/KeychainManager.swift

@@ -27,34 +27,6 @@ final class KeychainManager: KeychainManagerProtocol {
     private let service = BitchatApp.bundleID
     private let appGroup = "group.\(BitchatApp.bundleID)"
     
-    private func isSandboxed() -> Bool {
-        #if os(macOS)
-        // More robust sandbox detection using multiple methods
-        
-        // Method 1: Check environment variable (can be spoofed)
-        let environment = ProcessInfo.processInfo.environment
-        let hasEnvVar = environment["APP_SANDBOX_CONTAINER_ID"] != nil
-        
-        // Method 2: Check if we can access a path outside sandbox
-        let homeDir = FileManager.default.homeDirectoryForCurrentUser
-        let testPath = homeDir.appendingPathComponent("../../../tmp/bitchat_sandbox_test_\(UUID().uuidString)")
-        let canWriteOutsideSandbox = FileManager.default.createFile(atPath: testPath.path, contents: nil, attributes: nil)
-        if canWriteOutsideSandbox {
-            try? FileManager.default.removeItem(at: testPath)
-        }
-        
-        // Method 3: Check container path
-        let containerPath = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask).first?.path ?? ""
-        let hasContainerPath = containerPath.contains("/Containers/")
-        
-        // If any method indicates sandbox, we consider it sandboxed
-        return hasEnvVar || !canWriteOutsideSandbox || hasContainerPath
-        #else
-        // iOS is always sandboxed
-        return true
-        #endif
-    }
-    
     // MARK: - Identity Keys
     
     func saveIdentityKey(_ keyData: Data, forKey key: String) -> Bool {

bitchat/Services/LocationChannelManager.swift

@@ -64,7 +64,9 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
         switch status {
         case .authorizedAlways, .authorizedWhenInUse, .authorized:
             break // will compute from location
-        default:
+        case .notDetermined, .restricted, .denied:
+            fallthrough
+        @unknown default:
             if case .location(let ch) = selectedChannel {
                 teleported = teleportedSet.contains(ch.geohash)
             }

bitchat/Services/LocationNotesCounter.swift

@@ -1,104 +0,0 @@
-import BitLogger
-import Foundation
-
-struct LocationNotesCounterDependencies {
-    typealias RelayLookup = @MainActor (_ geohash: String, _ count: Int) -> [String]
-    typealias Subscribe = @MainActor (_ filter: NostrFilter, _ id: String, _ relays: [String], _ handler: @escaping (NostrEvent) -> Void, _ onEOSE: (() -> Void)?) -> Void
-    typealias Unsubscribe = @MainActor (_ id: String) -> Void
-
-    var relayLookup: RelayLookup
-    var subscribe: Subscribe
-    var unsubscribe: Unsubscribe
-
-    static let live = LocationNotesCounterDependencies(
-        relayLookup: { geohash, count in
-            GeoRelayDirectory.shared.closestRelays(toGeohash: geohash, count: count)
-        },
-        subscribe: { filter, id, relays, handler, onEOSE in
-            NostrRelayManager.shared.subscribe(
-                filter: filter,
-                id: id,
-                relayUrls: relays,
-                handler: handler,
-                onEOSE: onEOSE
-            )
-        },
-        unsubscribe: { id in
-            NostrRelayManager.shared.unsubscribe(id: id)
-        }
-    )
-}
-
-/// Lightweight background counter for location notes (kind 1) at building-level geohash (8 chars).
-@MainActor
-final class LocationNotesCounter: ObservableObject {
-    static let shared = LocationNotesCounter()
-
-    @Published private(set) var geohash: String? = nil
-    @Published private(set) var count: Int? = 0
-    @Published private(set) var initialLoadComplete: Bool = false
-    @Published private(set) var relayAvailable: Bool = true
-
-    private var subscriptionID: String? = nil
-    private var noteIDs = Set<String>()
-    private let dependencies: LocationNotesCounterDependencies
-
-    private init(dependencies: LocationNotesCounterDependencies = .live) {
-        self.dependencies = dependencies
-    }
-
-    init(testDependencies: LocationNotesCounterDependencies) {
-        self.dependencies = testDependencies
-    }
-
-    func subscribe(geohash gh: String) {
-        let norm = gh.lowercased()
-        if geohash == norm, subscriptionID != nil { return }
-        // Validate geohash (building-level precision: 8 chars)
-        guard Geohash.isValidBuildingGeohash(norm) else {
-            SecureLogger.warning("LocationNotesCounter: rejecting invalid geohash '\(norm)' (expected 8 valid base32 chars)", category: .session)
-            return
-        }
-        // Unsubscribe previous without clearing count to avoid flicker
-        if let sub = subscriptionID { dependencies.unsubscribe(sub) }
-        subscriptionID = nil
-        geohash = norm
-        noteIDs.removeAll()
-        initialLoadComplete = false
-        relayAvailable = true
-
-        // Subscribe only to the building geohash (precision 8)
-        let subID = "locnotes-count-\(norm)-\(UUID().uuidString.prefix(6))"
-        let relays = dependencies.relayLookup(norm, TransportConfig.nostrGeoRelayCount)
-        guard !relays.isEmpty else {
-            relayAvailable = false
-            initialLoadComplete = true
-            count = 0
-            SecureLogger.warning("LocationNotesCounter: no geo relays for geohash=\(norm)", category: .session)
-            return
-        }
-
-        subscriptionID = subID
-        let filter = NostrFilter.geohashNotes(norm, since: nil, limit: 200)
-        dependencies.subscribe(filter, subID, relays, { [weak self] event in
-            guard let self = self else { return }
-            guard event.kind == NostrProtocol.EventKind.textNote.rawValue else { return }
-            guard event.tags.contains(where: { $0.count >= 2 && $0[0].lowercased() == "g" && $0[1].lowercased() == norm }) else { return }
-            if !self.noteIDs.contains(event.id) {
-                self.noteIDs.insert(event.id)
-                self.count = self.noteIDs.count
-            }
-        }, { [weak self] in
-            self?.initialLoadComplete = true
-        })
-    }
-
-    func cancel() {
-        if let sub = subscriptionID { dependencies.unsubscribe(sub) }
-        subscriptionID = nil
-        geohash = nil
-        count = 0
-        noteIDs.removeAll()
-        relayAvailable = true
-    }
-}

bitchat/Services/LocationNotesManager.swift

@@ -15,6 +15,8 @@ struct LocationNotesDependencies {
     var deriveIdentity: (_ geohash: String) throws -> NostrIdentity
     var now: () -> Date
     
+    private static let idBridge = NostrIdentityBridge()
+
     static let live = LocationNotesDependencies(
         relayLookup: { geohash, count in
             GeoRelayDirectory.shared.closestRelays(toGeohash: geohash, count: count)
@@ -35,7 +37,7 @@ struct LocationNotesDependencies {
             NostrRelayManager.shared.sendEvent(event, to: relays)
         },
         deriveIdentity: { geohash in
-            try NostrIdentityBridge.deriveIdentity(forGeohash: geohash)
+            try idBridge.deriveIdentity(forGeohash: geohash)
         },
         now: { Date() }
     )
@@ -161,14 +163,22 @@ final class LocationNotesManager: ObservableObject {
 
         subscriptionID = subID
         initialLoadComplete = false
-        // For persistent notes, allow relays to return recent history without an aggressive time cutoff
-        let filter = NostrFilter.geohashNotes(geohash, since: nil, limit: 200)
+
+        // Subscribe to center + 8 neighbors (± 1 grid)
+        let neighbors = Geohash.neighbors(of: geohash)
+        let allGeohashes = [geohash] + neighbors
+        let filter = NostrFilter.geohashNotes(allGeohashes, since: nil, limit: 200)
+
+        // Build a set of valid geohashes for tag matching (includes all 9 cells)
+        let validGeohashes = Set(allGeohashes.map { $0.lowercased() })
 
         dependencies.subscribe(filter, subID, relays, { [weak self] event in
             guard let self = self else { return }
             guard event.kind == NostrProtocol.EventKind.textNote.rawValue else { return }
-            // Ensure matching tag
-            guard event.tags.contains(where: { $0.count >= 2 && $0[0].lowercased() == "g" && $0[1].lowercased() == self.geohash }) else { return }
+            // Ensure matching tag - accept any of our 9 geohashes
+            guard event.tags.contains(where: { tag in
+                tag.count >= 2 && tag[0].lowercased() == "g" && validGeohashes.contains(tag[1].lowercased())
+            }) else { return }
             guard !self.noteIDs.contains(event.id) else { return }
             self.noteIDs.insert(event.id)
             let nick = event.tags.first(where: { $0.first?.lowercased() == "n" && $0.count >= 2 })?.dropFirst().first

bitchat/Services/NostrTransport.swift

@@ -16,9 +16,11 @@ final class NostrTransport: Transport {
     private var isSendingReadAcks = false
     private let readAckInterval: TimeInterval = TransportConfig.nostrReadAckInterval
     private let keychain: KeychainManagerProtocol
+    private let idBridge: NostrIdentityBridge
 
-    init(keychain: KeychainManagerProtocol) {
+    init(keychain: KeychainManagerProtocol, idBridge: NostrIdentityBridge) {
         self.keychain = keychain
+        self.idBridge = idBridge
     }
 
     // MARK: - Transport Protocol Conformance
@@ -50,11 +52,10 @@ final class NostrTransport: Transport {
     
     // Nostr does not use Noise sessions here; return a cached placeholder to avoid reallocation
     private static var cachedNoiseService: NoiseEncryptionService?
-    private static let noiseServiceLock = NSLock()
     func getNoiseService() -> NoiseEncryptionService {
-        Self.noiseServiceLock.lock()
-        defer { Self.noiseServiceLock.unlock() }
-        if let noiseService = Self.cachedNoiseService { return noiseService }
+        if let noiseService = Self.cachedNoiseService {
+            return noiseService
+        }
         let noiseService = NoiseEncryptionService(keychain: keychain)
         Self.cachedNoiseService = noiseService
         return noiseService
@@ -66,7 +67,7 @@ final class NostrTransport: Transport {
     func sendPrivateMessage(_ content: String, to peerID: PeerID, recipientNickname: String, messageID: String) {
         Task { @MainActor in
             guard let recipientNpub = resolveRecipientNpub(for: peerID) else { return }
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { return }
+            guard let senderIdentity = try? idBridge.getCurrentNostrIdentity() else { return }
             SecureLogger.debug("NostrTransport: preparing PM to \(recipientNpub.prefix(16))… for peerID \(peerID.id.prefix(8))… id=\(messageID.prefix(8))…", category: .session)
             // Convert recipient npub -> hex (x-only)
             let recipientHex: String
@@ -81,7 +82,7 @@ final class NostrTransport: Transport {
                 SecureLogger.error("NostrTransport: failed to decode npub -> hex: \(error)", category: .session)
                 return
             }
-            guard let embedded = NostrEmbeddedBitChat.encodePMForNostr(content: content, messageID: messageID, recipientPeerID: peerID.id, senderPeerID: senderPeerID.id) else {
+            guard let embedded = NostrEmbeddedBitChat.encodePMForNostr(content: content, messageID: messageID, recipientPeerID: peerID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed PM packet", category: .session)
                 return
             }
@@ -103,7 +104,7 @@ final class NostrTransport: Transport {
     func sendFavoriteNotification(to peerID: PeerID, isFavorite: Bool) {
         Task { @MainActor in
             guard let recipientNpub = resolveRecipientNpub(for: peerID) else { return }
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { return }
+            guard let senderIdentity = try? idBridge.getCurrentNostrIdentity() else { return }
             let content = isFavorite ? "[FAVORITED]:\(senderIdentity.npub)" : "[UNFAVORITED]:\(senderIdentity.npub)"
             SecureLogger.debug("NostrTransport: preparing FAVORITE(\(isFavorite)) to \(recipientNpub.prefix(16))…", category: .session)
             // Convert recipient npub -> hex
@@ -113,7 +114,7 @@ final class NostrTransport: Transport {
                 guard hrp == "npub" else { return }
                 recipientHex = data.hexEncodedString()
             } catch { return }
-            guard let embedded = NostrEmbeddedBitChat.encodePMForNostr(content: content, messageID: UUID().uuidString, recipientPeerID: peerID.id, senderPeerID: senderPeerID.id) else {
+            guard let embedded = NostrEmbeddedBitChat.encodePMForNostr(content: content, messageID: UUID().uuidString, recipientPeerID: peerID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed favorite notification", category: .session)
                 return
             }
@@ -130,7 +131,7 @@ final class NostrTransport: Transport {
     func sendDeliveryAck(for messageID: String, to peerID: PeerID) {
         Task { @MainActor in
             guard let recipientNpub = resolveRecipientNpub(for: peerID) else { return }
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { return }
+            guard let senderIdentity = try? idBridge.getCurrentNostrIdentity() else { return }
             SecureLogger.debug("NostrTransport: preparing DELIVERED ack for id=\(messageID.prefix(8))… to \(recipientNpub.prefix(16))…", category: .session)
             let recipientHex: String
             do {
@@ -138,7 +139,7 @@ final class NostrTransport: Transport {
                 guard hrp == "npub" else { return }
                 recipientHex = data.hexEncodedString()
             } catch { return }
-            guard let ack = NostrEmbeddedBitChat.encodeAckForNostr(type: .delivered, messageID: messageID, recipientPeerID: peerID.id, senderPeerID: senderPeerID.id) else {
+            guard let ack = NostrEmbeddedBitChat.encodeAckForNostr(type: .delivered, messageID: messageID, recipientPeerID: peerID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed DELIVERED ack", category: .session)
                 return
             }
@@ -160,7 +161,7 @@ extension NostrTransport {
     func sendDeliveryAckGeohash(for messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity) {
         Task { @MainActor in
             SecureLogger.debug("GeoDM: send DELIVERED -> recip=\(recipientHex.prefix(8))… mid=\(messageID.prefix(8))… from=\(identity.publicKeyHex.prefix(8))…", category: .session)
-            guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .delivered, messageID: messageID, senderPeerID: senderPeerID.id) else { return }
+            guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .delivered, messageID: messageID, senderPeerID: senderPeerID) else { return }
             guard let event = try? NostrProtocol.createPrivateMessage(content: embedded, recipientPubkey: recipientHex, senderIdentity: identity) else { return }
             NostrRelayManager.registerPendingGiftWrap(id: event.id)
             NostrRelayManager.shared.sendEvent(event)
@@ -170,7 +171,7 @@ extension NostrTransport {
     func sendReadReceiptGeohash(_ messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity) {
         Task { @MainActor in
             SecureLogger.debug("GeoDM: send READ -> recip=\(recipientHex.prefix(8))… mid=\(messageID.prefix(8))… from=\(identity.publicKeyHex.prefix(8))…", category: .session)
-            guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .readReceipt, messageID: messageID, senderPeerID: senderPeerID.id) else { return }
+            guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .readReceipt, messageID: messageID, senderPeerID: senderPeerID) else { return }
             guard let event = try? NostrProtocol.createPrivateMessage(content: embedded, recipientPubkey: recipientHex, senderIdentity: identity) else { return }
             NostrRelayManager.registerPendingGiftWrap(id: event.id)
             NostrRelayManager.shared.sendEvent(event)
@@ -183,7 +184,7 @@ extension NostrTransport {
             guard !recipientHex.isEmpty else { return }
             SecureLogger.debug("GeoDM: send PM -> recip=\(recipientHex.prefix(8))… mid=\(messageID.prefix(8))… from=\(identity.publicKeyHex.prefix(8))…", category: .session)
             // Build embedded BitChat packet without recipient peer ID
-            guard let embedded = NostrEmbeddedBitChat.encodePMForNostrNoRecipient(content: content, messageID: messageID, senderPeerID: senderPeerID.id) else {
+            guard let embedded = NostrEmbeddedBitChat.encodePMForNostrNoRecipient(content: content, messageID: messageID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed geohash PM packet", category: .session)
                 return
             }
@@ -213,7 +214,7 @@ extension NostrTransport {
         let item = readQueue.removeFirst()
         Task { @MainActor in
             guard let recipientNpub = resolveRecipientNpub(for: item.peerID) else { scheduleNextReadAck(); return }
-            guard let senderIdentity = try? NostrIdentityBridge.getCurrentNostrIdentity() else { scheduleNextReadAck(); return }
+            guard let senderIdentity = try? idBridge.getCurrentNostrIdentity() else { scheduleNextReadAck(); return }
             SecureLogger.debug("NostrTransport: preparing READ ack for id=\(item.receipt.originalMessageID.prefix(8))… to \(recipientNpub.prefix(16))…", category: .session)
             // Convert recipient npub -> hex
             let recipientHex: String
@@ -222,7 +223,7 @@ extension NostrTransport {
                 guard hrp == "npub" else { scheduleNextReadAck(); return }
                 recipientHex = data.hexEncodedString()
             } catch { scheduleNextReadAck(); return }
-            guard let ack = NostrEmbeddedBitChat.encodeAckForNostr(type: .readReceipt, messageID: item.receipt.originalMessageID, recipientPeerID: item.peerID.id, senderPeerID: senderPeerID.id) else {
+            guard let ack = NostrEmbeddedBitChat.encodeAckForNostr(type: .readReceipt, messageID: item.receipt.originalMessageID, recipientPeerID: item.peerID, senderPeerID: senderPeerID) else {
                 SecureLogger.error("NostrTransport: failed to embed READ ack", category: .session)
                 scheduleNextReadAck(); return
             }

bitchat/Services/NotificationStreamAssembler.swift

@@ -6,10 +6,19 @@
 // For more information, see <https://unlicense.org>
 //
 
+import BitLogger
 import Foundation
 
 struct NotificationStreamAssembler {
     private var buffer = Data()
+    private var pendingFrameStartedAt: DispatchTime?
+    private var pendingFrameExpectedLength: Int = 0
+
+    private mutating func resetState() {
+        buffer.removeAll(keepingCapacity: false)
+        pendingFrameStartedAt = nil
+        pendingFrameExpectedLength = 0
+    }
 
     mutating func append(_ chunk: Data) -> (frames: [Data], droppedPrefixes: [UInt8], reset: Bool) {
         guard !chunk.isEmpty else { return ([], [], false) }
@@ -18,64 +27,107 @@ struct NotificationStreamAssembler {
 
         var frames: [Data] = []
         var dropped: [UInt8] = []
-        var reset = false
-        let maxFrameLength = TransportConfig.blePendingWriteBufferCapBytes
+        var didReset = false
+        let now = DispatchTime.now()
+        let maxFrameLength = TransportConfig.bleNotificationAssemblerHardCapBytes
+        let minimumFramePrefix = BinaryProtocol.v1HeaderSize + BinaryProtocol.senderIDSize
 
-        let minHeaderBytes = 14 // version + type + ttl + timestamp(8) + flags + length(2)
-        let minFramePrefix = minHeaderBytes + BinaryProtocol.senderIDSize
+        if buffer.count > TransportConfig.bleNotificationAssemblerHardCapBytes {
+            SecureLogger.error("❌ Notification assembler overflow (\(buffer.count) bytes); dropping partial frame", category: .session)
+            resetState()
+            return ([], [], true)
+        }
 
-        while buffer.count >= minFramePrefix {
-            guard let first = buffer.first else { break }
-            if first != 1 {
+        while buffer.count >= minimumFramePrefix {
+            guard let version = buffer.first else { break }
+            guard version == 1 || version == 2 else {
                 dropped.append(buffer.removeFirst())
+                pendingFrameStartedAt = nil
+                pendingFrameExpectedLength = 0
                 continue
             }
 
-            guard buffer.count >= minHeaderBytes else { break }
+            guard let headerSize = BinaryProtocol.headerSize(for: version) else {
+                dropped.append(buffer.removeFirst())
+                pendingFrameStartedAt = nil
+                pendingFrameExpectedLength = 0
+                continue
+            }
+            let framePrefix = headerSize + BinaryProtocol.senderIDSize
+            guard buffer.count >= framePrefix else { break }
 
-            let headerBytes = Array(buffer.prefix(minFramePrefix))
-            guard headerBytes.count == minFramePrefix else { break }
-
-            let flags = headerBytes[11]
+            let flagsIndex = buffer.startIndex + BinaryProtocol.Offsets.flags
+            guard flagsIndex < buffer.endIndex else { break }
+            let flags = buffer[flagsIndex]
             let hasRecipient = (flags & BinaryProtocol.Flags.hasRecipient) != 0
             let hasSignature = (flags & BinaryProtocol.Flags.hasSignature) != 0
-            let payloadLen = (Int(headerBytes[12]) << 8) | Int(headerBytes[13])
+            let isCompressed = (flags & BinaryProtocol.Flags.isCompressed) != 0
 
-            var frameLength = minFramePrefix + payloadLen
+            let lengthOffset = 12
+            let payloadLength: Int
+            if version == 2 {
+                let lengthIndex = buffer.startIndex + lengthOffset
+                payloadLength =
+                    (Int(buffer[lengthIndex]) << 24) |
+                    (Int(buffer[lengthIndex + 1]) << 16) |
+                    (Int(buffer[lengthIndex + 2]) << 8) |
+                    Int(buffer[lengthIndex + 3])
+            } else {
+                let lengthIndex = buffer.startIndex + lengthOffset
+                payloadLength = (Int(buffer[lengthIndex]) << 8) | Int(buffer[lengthIndex + 1])
+            }
+
+            var frameLength = framePrefix + payloadLength
             if hasRecipient { frameLength += BinaryProtocol.recipientIDSize }
             if hasSignature { frameLength += BinaryProtocol.signatureSize }
+            if isCompressed {
+                let rawLengthFieldBytes = (version == 2) ? 4 : 2
+                if payloadLength < rawLengthFieldBytes {
+                    SecureLogger.error("❌ Invalid compressed payload length (\(payloadLength))", category: .session)
+                    resetState()
+                    didReset = true
+                    break
+                }
+            }
 
             guard frameLength > 0, frameLength <= maxFrameLength else {
-                buffer.removeAll()
-                reset = true
+                SecureLogger.error("❌ Notification frame length \(frameLength) invalid (cap=\(maxFrameLength)); resetting stream", category: .session)
+                resetState()
+                didReset = true
                 break
             }
 
             if buffer.count < frameLength {
-                // Check if a new frame start exists within the incomplete buffer; if so, drop leading partial bytes.
-                if let nextStart = buffer.dropFirst().firstIndex(of: 1) {
-                    let dropCount = buffer.distance(from: buffer.startIndex, to: nextStart)
-                    if dropCount > 0 {
-                        buffer.removeFirst(dropCount)
-                        dropped.append(1) // treat as dropped partial start
+                let remaining = frameLength - buffer.count
+                if pendingFrameStartedAt == nil || frameLength != pendingFrameExpectedLength {
+                    pendingFrameStartedAt = now
+                    pendingFrameExpectedLength = frameLength
+                } else if let started = pendingFrameStartedAt {
+                    let elapsed = now.uptimeNanoseconds - started.uptimeNanoseconds
+                    let threshold = UInt64(TransportConfig.bleAssemblerStallResetMs) * 1_000_000
+                    if elapsed >= threshold {
+                        SecureLogger.debug("📉 Resetting notification assembler after waiting \(remaining)B for \(TransportConfig.bleAssemblerStallResetMs)ms", category: .session)
+                        resetState()
+                        didReset = true
+                    } else {
+                        SecureLogger.debug("⌛ Waiting for remaining \(remaining)B to complete BLE frame", category: .session)
                     }
                 }
                 break
             }
 
+            pendingFrameStartedAt = nil
+            pendingFrameExpectedLength = 0
+
             let frame = Data(buffer.prefix(frameLength))
             frames.append(frame)
             buffer.removeFirst(frameLength)
         }
 
         if !buffer.isEmpty, buffer.allSatisfy({ $0 == 0 }) {
-            buffer.removeAll(keepingCapacity: false)
+            resetState()
         }
 
-        return (frames, dropped, reset)
-    }
-
-    mutating func reset() {
-        buffer.removeAll(keepingCapacity: false)
+        return (frames, dropped, didReset)
     }
 }

bitchat/Services/PrivateChatManager.swift

@@ -12,9 +12,9 @@ import SwiftUI
 
 /// Manages all private chat functionality
 final class PrivateChatManager: ObservableObject {
-    @Published var privateChats: [String: [BitchatMessage]] = [:]
-    @Published var selectedPeer: String? = nil
-    @Published var unreadMessages: Set<String> = []
+    @Published var privateChats: [PeerID: [BitchatMessage]] = [:]
+    @Published var selectedPeer: PeerID? = nil
+    @Published var unreadMessages: Set<PeerID> = []
     
     private var selectedPeerFingerprint: String? = nil
     var sentReadReceipts: Set<String> = []  // Made accessible for ChatViewModel
@@ -31,11 +31,11 @@ final class PrivateChatManager: ObservableObject {
     private let privateChatCap = TransportConfig.privateChatCap
     
     /// Start a private chat with a peer
-    func startChat(with peerID: String) {
+    func startChat(with peerID: PeerID) {
         selectedPeer = peerID
         
         // Store fingerprint for persistence across reconnections
-        if let fingerprint = meshService?.getFingerprint(for: PeerID(str: peerID)) {
+        if let fingerprint = meshService?.getFingerprint(for: peerID) {
             selectedPeerFingerprint = fingerprint
         }
         
@@ -55,7 +55,7 @@ final class PrivateChatManager: ObservableObject {
     }
 
     /// Remove duplicate messages by ID and keep chronological order
-    func sanitizeChat(for peerID: String) {
+    func sanitizeChat(for peerID: PeerID) {
         guard let arr = privateChats[peerID] else { return }
         if arr.count <= 1 {
             return
@@ -79,7 +79,7 @@ final class PrivateChatManager: ObservableObject {
     }
     
     /// Mark messages from a peer as read
-    func markAsRead(from peerID: String) {
+    func markAsRead(from peerID: PeerID) {
         unreadMessages.remove(peerID)
         
         // Send read receipts for unread messages that haven't been sent yet
@@ -105,7 +105,7 @@ final class PrivateChatManager: ObservableObject {
         // Create read receipt using the simplified method
         let receipt = ReadReceipt(
             originalMessageID: message.id,
-            readerID: meshService?.myPeerID.id ?? "",
+            readerID: meshService?.myPeerID ?? PeerID(str: ""),
             readerNickname: meshService?.myNickname ?? ""
         )
         

bitchat/Services/TransferProgressManager.swift

@@ -0,0 +1,65 @@
+import Foundation
+import Combine
+
+/// Centralized progress bus for Bluetooth file transfers.
+/// Emits Combine events consumed by ChatViewModel to update UI progress indicators.
+final class TransferProgressManager {
+    static let shared = TransferProgressManager()
+
+    enum Event {
+        case started(id: String, totalFragments: Int)
+        case updated(id: String, sentFragments: Int, totalFragments: Int)
+        case completed(id: String, totalFragments: Int)
+        case cancelled(id: String, sentFragments: Int, totalFragments: Int)
+    }
+
+    private let subject = PassthroughSubject<Event, Never>()
+    private let queue = DispatchQueue(label: "com.bitchat.transfer-progress", attributes: .concurrent)
+    private var states: [String: (sent: Int, total: Int)] = [:]
+
+    var publisher: AnyPublisher<Event, Never> {
+        subject.eraseToAnyPublisher()
+    }
+
+    func start(id: String, totalFragments: Int) {
+        queue.async(flags: .barrier) { [weak self] in
+            guard let self = self else { return }
+            self.states[id] = (sent: 0, total: totalFragments)
+            self.subject.send(.started(id: id, totalFragments: totalFragments))
+        }
+    }
+
+    func recordFragmentSent(id: String) {
+        queue.async(flags: .barrier) { [weak self] in
+            guard let self = self, var state = self.states[id] else { return }
+            state.sent = min(state.sent + 1, state.total)
+            self.states[id] = state
+            self.subject.send(.updated(id: id, sentFragments: state.sent, totalFragments: state.total))
+            if state.sent >= state.total {
+                self.states.removeValue(forKey: id)
+                self.subject.send(.completed(id: id, totalFragments: state.total))
+            }
+        }
+    }
+
+    func cancel(id: String) {
+        queue.async(flags: .barrier) { [weak self] in
+            guard let self = self, let state = self.states.removeValue(forKey: id) else { return }
+            self.subject.send(.cancelled(id: id, sentFragments: state.sent, totalFragments: state.total))
+        }
+    }
+
+    func reset(id: String) {
+        queue.async(flags: .barrier) { [weak self] in
+            self?.states.removeValue(forKey: id)
+        }
+    }
+
+    func snapshot(id: String) -> (sent: Int, total: Int)? {
+        var result: (sent: Int, total: Int)?
+        queue.sync {
+            result = states[id]
+        }
+        return result
+    }
+}

bitchat/Services/Transport.swift

@@ -50,6 +50,9 @@ protocol Transport: AnyObject {
     func sendFavoriteNotification(to peerID: PeerID, isFavorite: Bool)
     func sendBroadcastAnnounce()
     func sendDeliveryAck(for messageID: String, to peerID: PeerID)
+    func sendFileBroadcast(_ packet: BitchatFilePacket, transferId: String)
+    func sendFilePrivate(_ packet: BitchatFilePacket, to peerID: PeerID, transferId: String)
+    func cancelTransfer(_ transferId: String)
 
     // QR verification (optional for transports)
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data)
@@ -59,6 +62,9 @@ protocol Transport: AnyObject {
 extension Transport {
     func sendVerifyChallenge(to peerID: PeerID, noiseKeyHex: String, nonceA: Data) {}
     func sendVerifyResponse(to peerID: PeerID, noiseKeyHex: String, nonceA: Data) {}
+    func sendFileBroadcast(_ packet: BitchatFilePacket, transferId: String) {}
+    func sendFilePrivate(_ packet: BitchatFilePacket, to peerID: PeerID, transferId: String) {}
+    func cancelTransfer(_ transferId: String) {}
 }
 
 protocol TransportPeerEventsDelegate: AnyObject {

bitchat/Services/TransportConfig.swift

@@ -30,7 +30,11 @@ enum TransportConfig {
     static let bleDynamicRSSIThresholdDefault: Int = -90
     static let bleConnectionCandidatesMax: Int = 100
     static let blePendingWriteBufferCapBytes: Int = 1_000_000
-    static let blePendingNotificationsCapCount: Int = 20
+    static let bleNotificationAssemblerHardCapBytes: Int = 8 * 1024 * 1024
+    static let bleAssemblerStallResetMs: Int = 250
+    static let blePendingNotificationsCapCount: Int = 128
+    static let bleNotificationRetryDelayMs: Int = 25
+    static let bleNotificationRetryMaxAttempts: Int = 80
 
     // Nostr
     static let nostrReadAckInterval: TimeInterval = 0.35 // ~3 per second
@@ -141,6 +145,9 @@ enum TransportConfig {
 
     // Geo relay directory
     static let geoRelayFetchIntervalSeconds: TimeInterval = 60 * 60 * 24
+    static let geoRelayRefreshCheckIntervalSeconds: TimeInterval = 60 * 60
+    static let geoRelayRetryInitialSeconds: TimeInterval = 60
+    static let geoRelayRetryMaxSeconds: TimeInterval = 60 * 60
 
     // BLE operational delays
     static let bleInitialAnnounceDelaySeconds: TimeInterval = 0.6

bitchat/Services/UnifiedPeerService.swift

@@ -27,6 +27,7 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
     private var peerIndex: [PeerID: BitchatPeer] = [:]
     private var fingerprintCache: [PeerID: String] = [:]
     private let meshService: Transport
+    private let idBridge: NostrIdentityBridge
     private let identityManager: SecureIdentityStateManagerProtocol
     weak var messageRouter: MessageRouter?
     private let favoritesService = FavoritesPersistenceService.shared
@@ -34,8 +35,13 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
     
     // MARK: - Initialization
     
-    init(meshService: Transport, identityManager: SecureIdentityStateManagerProtocol) {
+    init(
+        meshService: Transport,
+        idBridge: NostrIdentityBridge,
+        identityManager: SecureIdentityStateManagerProtocol
+    ) {
         self.meshService = meshService
+        self.idBridge = idBridge
         self.identityManager = identityManager
         
         // Subscribe to changes from both services
@@ -229,10 +235,10 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
     }
     
     /// Get peer ID for nickname
-    func getPeerID(for nickname: String) -> String? {
+    func getPeerID(for nickname: String) -> PeerID? {
         for peer in peers {
             if peer.displayName == nickname || peer.nickname == nickname {
-                return peer.peerID.id
+                return peer.peerID
             }
         }
         return nil
@@ -285,7 +291,7 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
             var peerNostrKey = peer.nostrPublicKey
             if peerNostrKey == nil {
                 // Try to get from NostrIdentityBridge association
-                peerNostrKey = NostrIdentityBridge.getNostrPublicKey(for: peer.noisePublicKey)
+                peerNostrKey = idBridge.getNostrPublicKey(for: peer.noisePublicKey)
             }
             
             // Add favorite
@@ -341,7 +347,7 @@ final class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
     // MARK: - Compatibility Methods (for easy migration)
     
     var allPeers: [BitchatPeer] { peers }
-    var connectedPeers: [PeerID] { Array(connectedPeerIDs) }
+    var connectedPeers: Set<PeerID> { connectedPeerIDs }
     var favoritePeers: Set<String> {
         Set(favorites.compactMap { getFingerprint(for: $0.peerID) })
     }

bitchat/Sync/GossipSyncManager.swift

@@ -13,6 +13,9 @@ final class GossipSyncManager {
         var gcsMaxBytes: Int = 400           // filter size budget (128..1024)
         var gcsTargetFpr: Double = 0.01      // 1%
         var maxMessageAgeSeconds: TimeInterval = 900  // 15 min - discard older messages
+        var maintenanceIntervalSeconds: TimeInterval = 30.0
+        var stalePeerCleanupIntervalSeconds: TimeInterval = 60.0
+        var stalePeerTimeoutSeconds: TimeInterval = 60.0
     }
 
     private let myPeerID: PeerID
@@ -27,6 +30,7 @@ final class GossipSyncManager {
     // Timer
     private var periodicTimer: DispatchSourceTimer?
     private let queue = DispatchQueue(label: "mesh.sync", qos: .utility)
+    private var lastStalePeerCleanup: Date = .distantPast
 
     init(myPeerID: PeerID, config: Config = Config()) {
         self.myPeerID = myPeerID
@@ -36,10 +40,10 @@ final class GossipSyncManager {
     func start() {
         stop()
         let timer = DispatchSource.makeTimerSource(queue: queue)
-        timer.schedule(deadline: .now() + 30.0, repeating: 30.0, leeway: .seconds(1))
+        let interval = max(0.1, config.maintenanceIntervalSeconds)
+        timer.schedule(deadline: .now() + interval, repeating: interval, leeway: .seconds(1))
         timer.setEventHandler { [weak self] in
-            self?.cleanupExpiredMessages()
-            self?.sendRequestSync()
+            self?.performPeriodicMaintenance()
         }
         timer.resume()
         periodicTimer = timer
@@ -73,6 +77,15 @@ final class GossipSyncManager {
         return packet.timestamp >= cutoffMs
     }
 
+    private func isAnnouncementFresh(_ packet: BitchatPacket) -> Bool {
+        guard config.stalePeerTimeoutSeconds > 0 else { return true }
+        let nowMs = UInt64(Date().timeIntervalSince1970 * 1000)
+        let timeoutMs = UInt64(config.stalePeerTimeoutSeconds * 1000)
+        guard nowMs >= timeoutMs else { return true }
+        let cutoffMs = nowMs - timeoutMs
+        return packet.timestamp >= cutoffMs
+    }
+
     private func _onPublicPacketSeen(_ packet: BitchatPacket) {
         let mt = MessageType(rawValue: packet.type)
         let isBroadcastRecipient: Bool = {
@@ -86,6 +99,14 @@ final class GossipSyncManager {
         // Reject expired packets to prevent ghost peers and old messages
         guard isPacketFresh(packet) else { return }
 
+        if isAnnounce {
+            guard isAnnouncementFresh(packet) else {
+                let sender = packet.senderID.hexEncodedString().lowercased()
+                removeState(forNormalizedPeerID: sender)
+                return
+            }
+        }
+
         let idHex = PacketIdUtil.computeId(packet).hexEncodedString()
 
         if isBroadcastMessage {
@@ -100,7 +121,7 @@ final class GossipSyncManager {
                 }
             }
         } else if isAnnounce {
-            let sender = packet.senderID.hexEncodedString()
+            let sender = packet.senderID.hexEncodedString().lowercased()
             latestAnnouncementByPeer[sender] = (id: idHex, packet: packet)
         }
     }
@@ -230,6 +251,34 @@ final class GossipSyncManager {
         }
     }
 
+    private func performPeriodicMaintenance(now: Date = Date()) {
+        cleanupExpiredMessages()
+        cleanupStaleAnnouncementsIfNeeded(now: now)
+        sendRequestSync()
+    }
+
+    private func cleanupStaleAnnouncementsIfNeeded(now: Date) {
+        guard now.timeIntervalSince(lastStalePeerCleanup) >= config.stalePeerCleanupIntervalSeconds else {
+            return
+        }
+        lastStalePeerCleanup = now
+        cleanupStaleAnnouncements(now: now)
+    }
+
+    private func cleanupStaleAnnouncements(now: Date) {
+        let timeoutMs = UInt64(config.stalePeerTimeoutSeconds * 1000)
+        let nowMs = UInt64(now.timeIntervalSince1970 * 1000)
+        guard nowMs >= timeoutMs else { return }
+        let cutoff = nowMs - timeoutMs
+        let stalePeerIDs = latestAnnouncementByPeer.compactMap { (peerHex, pair) -> String? in
+            pair.packet.timestamp < cutoff ? peerHex.lowercased() : nil
+        }
+        guard !stalePeerIDs.isEmpty else { return }
+        for peerKey in stalePeerIDs {
+            removeState(forNormalizedPeerID: peerKey)
+        }
+    }
+
     // Explicit removal hook for LEAVE/stale peer
     func removeAnnouncementForPeer(_ peerID: PeerID) {
         queue.async { [weak self] in
@@ -239,8 +288,11 @@ final class GossipSyncManager {
 
     private func _removeAnnouncementForPeer(_ peerID: PeerID) {
         let normalizedPeerID = peerID.id.lowercased()
-        _ = latestAnnouncementByPeer.removeValue(forKey: normalizedPeerID)
+        removeState(forNormalizedPeerID: normalizedPeerID)
+    }
 
+    private func removeState(forNormalizedPeerID normalizedPeerID: String) {
+        _ = latestAnnouncementByPeer.removeValue(forKey: normalizedPeerID)
         // Remove messages from this peer
         // Collect IDs to remove first to avoid concurrent modification
         let messageIdsToRemove = messages.compactMap { (id, message) -> String? in
@@ -254,3 +306,25 @@ final class GossipSyncManager {
         }
     }
 }
+
+#if DEBUG
+extension GossipSyncManager {
+    func _performMaintenanceSynchronously(now: Date = Date()) {
+        queue.sync {
+            performPeriodicMaintenance(now: now)
+        }
+    }
+
+    func _hasAnnouncement(for peerID: PeerID) -> Bool {
+        queue.sync {
+            latestAnnouncementByPeer[peerID.id.lowercased()] != nil
+        }
+    }
+
+    func _messageCount(for peerID: PeerID) -> Int {
+        queue.sync {
+            messages.values.filter { $0.senderID.hexEncodedString().lowercased() == peerID.id.lowercased() }.count
+        }
+    }
+}
+#endif

bitchat/Utils/FileTransferLimits.swift

@@ -0,0 +1,25 @@
+import Foundation
+
+/// Centralized thresholds for Bluetooth file transfers to keep payload sizes sane on constrained radios.
+enum FileTransferLimits {
+    /// Absolute ceiling enforced for any file payload (voice, image, other).
+    static let maxPayloadBytes: Int = 1 * 1024 * 1024 // 1 MiB
+    /// Voice notes stay small for low-latency relays.
+    static let maxVoiceNoteBytes: Int = 1 * 1024 * 1024 // 1 MiB
+    /// Compressed images after downscaling should comfortably fit under this budget.
+    static let maxImageBytes: Int = 1 * 1024 * 1024 // 1 MiB
+    /// Worst-case size once TLV metadata and binary packet framing are included for the largest payloads.
+    static let maxFramedFileBytes: Int = {
+        let maxMetadataBytes = Int(UInt16.max) * 2 // fileName + mimeType TLVs
+        let tlvEnvelopeOverhead = 18 + maxMetadataBytes // TLV tags + lengths + metadata bytes
+        let binaryEnvelopeOverhead = BinaryProtocol.v2HeaderSize
+            + BinaryProtocol.senderIDSize
+            + BinaryProtocol.recipientIDSize
+            + BinaryProtocol.signatureSize
+        return maxPayloadBytes + tlvEnvelopeOverhead + binaryEnvelopeOverhead
+    }()
+
+    static func isValidPayload(_ size: Int) -> Bool {
+        size <= maxPayloadBytes
+    }
+}

bitchat/Views/Components/TextMessageView.swift

@@ -91,6 +91,7 @@ struct TextMessageView: View {
     .environmentObject(
         ChatViewModel(
             keychain: keychain,
+            idBridge: NostrIdentityBridge(),
             identityManager: SecureIdentityStateManager(keychain)
         )
     )

bitchat/Views/FingerprintView.swift

@@ -10,7 +10,7 @@ import SwiftUI
 
 struct FingerprintView: View {
     @ObservedObject var viewModel: ChatViewModel
-    let peerID: String
+    let peerID: PeerID
     @Environment(\.dismiss) var dismiss
     @Environment(\.colorScheme) var colorScheme
     
@@ -65,15 +65,15 @@ struct FingerprintView: View {
             
             VStack(alignment: .leading, spacing: 16) {
                 // Prefer short mesh ID for session/encryption status
-                let statusPeerID: String = {
-                    if peerID.count == 64, let short = viewModel.getShortIDForNoiseKey(peerID) { return short }
+                let statusPeerID: PeerID = {
+                    if peerID.id.count == 64, let short = viewModel.getShortIDForNoiseKey(peerID.id) { return short }
                     return peerID
                 }()
                 // Resolve a friendly name
                 let peerNickname: String = {
                     if let p = viewModel.getPeer(byID: statusPeerID) { return p.displayName }
-                    if let name = viewModel.meshService.peerNickname(peerID: PeerID(str: statusPeerID)) { return name }
-                    if peerID.count == 64, let data = Data(hexString: peerID) {
+                    if let name = viewModel.meshService.peerNickname(peerID: statusPeerID) { return name }
+                    if let data = peerID.noiseKey {
                         if let fav = FavoritesPersistenceService.shared.getFavoriteStatus(for: data), !fav.peerNickname.isEmpty { return fav.peerNickname }
                         let fp = data.sha256Fingerprint()
                         if let social = viewModel.identityManager.getSocialIdentity(for: fp) {
@@ -239,8 +239,6 @@ struct FingerprintView: View {
         .padding()
         .frame(maxWidth: .infinity, maxHeight: .infinity)
         .background(backgroundColor)
-        .presentationDetents([.large])
-        .presentationDragIndicator(.visible)
     }
     
     private func formatFingerprint(_ fingerprint: String) -> String {

bitchat/Views/GeohashPeopleList.swift

@@ -28,7 +28,7 @@ struct GeohashPeopleList: View {
         } else {
             let myHex: String? = {
                 if case .location(let ch) = LocationChannelManager.shared.selectedChannel,
-                   let id = try? NostrIdentityBridge.deriveIdentity(forGeohash: ch.geohash) {
+                   let id = try? viewModel.idBridge.deriveIdentity(forGeohash: ch.geohash) {
                     return id.publicKeyHex.lowercased()
                 }
                 return nil

bitchat/Views/LocationChannelsSheet.swift

@@ -125,9 +125,6 @@ struct LocationChannelsSheet: View {
             .navigationTitle("")
             #endif
         }
-        #if os(iOS)
-        .presentationDetents([.large])
-        #endif
         #if os(macOS)
         .frame(minWidth: 420, minHeight: 520)
         #endif
@@ -599,7 +596,7 @@ extension LocationChannelsSheet {
         switch level {
         case .region:
             return ""
-        default:
+        case .building, .block, .neighborhood, .city, .province:
             return "~"
         }
     }

bitchat/Views/LocationNotesView.swift

@@ -78,9 +78,6 @@ struct LocationNotesView: View {
             .navigationTitle("")
             #endif
         }
-       #if os(iOS)
-        .presentationDetents([.large])
-        #endif
         .background(backgroundColor)
         .onDisappear { manager.cancel() }
         .onChange(of: geohash) { newValue in
@@ -141,7 +138,7 @@ struct LocationNotesView: View {
         String(
             format: String(localized: "location_notes.header", comment: "Header displaying the geohash and localized note count"),
             locale: .current,
-            geohash, count
+            "\(geohash) ± 1", count
         )
     }
 

bitchat/Views/Media/BlockRevealImageView.swift

@@ -0,0 +1,191 @@
+import SwiftUI
+
+#if os(iOS)
+import UIKit
+private typealias PlatformImage = UIImage
+#else
+import AppKit
+private typealias PlatformImage = NSImage
+#endif
+
+struct BlockRevealImageView: View {
+    private let url: URL
+    private let revealProgress: Double?
+    private let isSending: Bool
+    private let onCancel: (() -> Void)?
+    private let initiallyBlurred: Bool
+    private let onOpen: (() -> Void)?
+    private let onDelete: (() -> Void)?
+
+    @State private var platformImage: PlatformImage?
+    @State private var aspectRatio: CGFloat = 1
+    @State private var isBlurred: Bool = false
+
+    init(
+        url: URL,
+        revealProgress: Double?,
+        isSending: Bool,
+        onCancel: (() -> Void)?,
+        initiallyBlurred: Bool = false,
+        onOpen: (() -> Void)? = nil,
+        onDelete: (() -> Void)? = nil
+    ) {
+        self.url = url
+        self.revealProgress = revealProgress
+        self.isSending = isSending
+        self.onCancel = onCancel
+        self.initiallyBlurred = initiallyBlurred
+        self.onOpen = onOpen
+        self.onDelete = onDelete
+    }
+
+    private var fraction: Double {
+        guard let revealProgress = revealProgress else { return 1 }
+        return max(0, min(1, revealProgress))
+    }
+
+    var body: some View {
+        ZStack(alignment: .topTrailing) {
+            if let image = platformImage {
+                Image(platformImage: image)
+                    .resizable()
+                    .aspectRatio(aspectRatio, contentMode: .fit)
+                    .clipShape(RoundedRectangle(cornerRadius: 16, style: .continuous))
+                    .overlay(
+                        RoundedRectangle(cornerRadius: 16, style: .continuous)
+                            .stroke(Color.gray.opacity(0.2), lineWidth: 1)
+                    )
+                    .mask(
+                        BlockRevealMask(
+                            fraction: fraction,
+                            columns: 24,
+                            rows: 16
+                        )
+                        .animation(.easeOut(duration: 0.2), value: fraction)
+                    )
+                    .blur(radius: isBlurred ? 20 : 0)
+                    .overlay {
+                        if isBlurred {
+                            RoundedRectangle(cornerRadius: 16, style: .continuous)
+                                .fill(Color.black.opacity(0.35))
+                                .overlay(
+                                    Image(systemName: "eye.slash.fill")
+                                        .font(.bitchatSystem(size: 24, weight: .semibold))
+                                        .foregroundColor(.white.opacity(0.85))
+                                )
+                        }
+                    }
+            } else {
+                RoundedRectangle(cornerRadius: 16, style: .continuous)
+                    .fill(Color.gray.opacity(0.2))
+                    .frame(height: 200)
+                    .overlay(
+                        ProgressView()
+                            .progressViewStyle(.circular)
+                    )
+            }
+
+            if let onCancel = onCancel, isSending {
+                Button(action: onCancel) {
+                    Image(systemName: "xmark")
+                        .font(.bitchatSystem(size: 12, weight: .bold))
+                        .padding(8)
+                        .background(Circle().fill(Color.black.opacity(0.7)))
+                        .foregroundColor(.white)
+                        .padding(8)
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .onAppear {
+            isBlurred = initiallyBlurred
+            loadImage()
+        }
+        .onChange(of: url) { _ in
+            isBlurred = initiallyBlurred
+            loadImage()
+        }
+        .gesture(mainGesture)
+    }
+
+    private func loadImage() {
+        DispatchQueue.global(qos: .userInitiated).async {
+            #if os(iOS)
+            guard let image = UIImage(contentsOfFile: url.path) else { return }
+            #else
+            guard let image = NSImage(contentsOf: url) else { return }
+            #endif
+            let ratio = image.size.height > 0 ? image.size.width / image.size.height : 1
+            DispatchQueue.main.async {
+                self.platformImage = image
+                self.aspectRatio = ratio
+            }
+        }
+    }
+
+    private var mainGesture: some Gesture {
+        let doubleTap = TapGesture(count: 2).onEnded {
+            guard !isSending else { return }
+            onDelete?()
+        }
+        let singleTap = TapGesture().onEnded {
+            guard !isSending else { return }
+            if isBlurred {
+                withAnimation(.easeOut(duration: 0.2)) {
+                    isBlurred = false
+                }
+            } else {
+                onOpen?()
+            }
+        }
+        let swipe = DragGesture(minimumDistance: 20, coordinateSpace: .local).onEnded { value in
+            guard !isSending else { return }
+            let horizontal = value.translation.width
+            let vertical = value.translation.height
+            guard abs(horizontal) > abs(vertical), abs(horizontal) > 40 else { return }
+            if !isBlurred {
+                withAnimation(.easeInOut(duration: 0.2)) {
+                    isBlurred = true
+                }
+            }
+        }
+        return doubleTap.exclusively(before: singleTap).simultaneously(with: swipe)
+    }
+}
+
+private struct BlockRevealMask: Shape {
+    let fraction: Double
+    let columns: Int
+    let rows: Int
+
+    func path(in rect: CGRect) -> Path {
+        var path = Path()
+        guard fraction > 0, columns > 0, rows > 0 else { return path }
+        let totalBlocks = columns * rows
+        let revealCount = max(0, min(totalBlocks, Int(ceil(fraction * Double(totalBlocks)))))
+        guard revealCount > 0 else { return path }
+        let blockWidth = rect.width / CGFloat(columns)
+        let blockHeight = rect.height / CGFloat(rows)
+        var remaining = revealCount
+        for row in 0..<rows {
+            for column in 0..<columns {
+                if remaining <= 0 { return path }
+                let x = CGFloat(column) * blockWidth
+                let y = CGFloat(row) * blockHeight
+                path.addRect(CGRect(x: x, y: y, width: blockWidth, height: blockHeight))
+                remaining -= 1
+            }
+        }
+        return path
+    }
+}
+
+private extension Image {
+    init(platformImage: PlatformImage) {
+        #if os(iOS)
+        self.init(uiImage: platformImage)
+        #else
+        self.init(nsImage: platformImage)
+        #endif
+    }
+}

bitchat/Views/Media/VoiceNoteView.swift

@@ -0,0 +1,123 @@
+import SwiftUI
+import AVFoundation
+
+struct VoiceNoteView: View {
+    private let url: URL
+    private let isSending: Bool
+    private let sendProgress: Double?
+    private let onCancel: (() -> Void)?
+
+    @Environment(\.colorScheme) private var colorScheme
+    @StateObject private var playback: VoiceNotePlaybackController
+    @State private var waveform: [Float] = []
+
+    init(url: URL, isSending: Bool, sendProgress: Double?, onCancel: (() -> Void)?) {
+        self.url = url
+        self.isSending = isSending
+        self.sendProgress = sendProgress
+        self.onCancel = onCancel
+        _playback = StateObject(wrappedValue: VoiceNotePlaybackController(url: url))
+    }
+
+    private var samples: [Float] {
+        if waveform.isEmpty {
+            return Array(repeating: 0.25, count: 64)
+        }
+        return waveform
+    }
+
+    private var backgroundColor: Color {
+        colorScheme == .dark ? Color.black.opacity(0.6) : Color.white
+    }
+
+    private var borderColor: Color {
+        colorScheme == .dark ? Color.green.opacity(0.3) : Color.green.opacity(0.2)
+    }
+
+    private var durationText: String {
+        let duration = playback.duration
+        guard duration.isFinite, duration > 0 else { return "--:--" }
+        let minutes = Int(duration) / 60
+        let seconds = Int(duration) % 60
+        return String(format: "%02d:%02d", minutes, seconds)
+    }
+
+    private var currentText: String {
+        let current = playback.currentTime
+        guard current.isFinite, current > 0 else { return "00:00" }
+        let minutes = Int(current) / 60
+        let seconds = Int(current) % 60
+        return String(format: "%02d:%02d", minutes, seconds)
+    }
+
+    private var playbackLabel: String {
+        playback.isPlaying ? currentText + "/" + durationText : durationText
+    }
+
+    var body: some View {
+        HStack(spacing: 12) {
+            Button(action: playback.togglePlayback) {
+                Image(systemName: playback.isPlaying ? "pause.fill" : "play.fill")
+                    .foregroundColor(.white)
+                    .frame(width: 36, height: 36)
+                    .background(Circle().fill(Color.green))
+            }
+            .buttonStyle(.plain)
+
+            WaveformView(
+                samples: samples,
+                playbackProgress: playback.progress,
+                sendProgress: sendProgress,
+                onSeek: { fraction in
+                    playback.seek(to: fraction)
+                },
+                isInteractive: playback.isPlaying
+            )
+
+            Text(playbackLabel)
+                .font(.bitchatSystem(size: 13, design: .monospaced))
+                .foregroundColor(Color.secondary)
+
+            if let onCancel = onCancel, isSending {
+                Button(action: onCancel) {
+                    Image(systemName: "xmark")
+                        .font(.bitchatSystem(size: 12, weight: .bold))
+                        .frame(width: 28, height: 28)
+                        .background(Circle().fill(Color.red.opacity(0.9)))
+                        .foregroundColor(.white)
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .padding(12)
+        .background(
+            RoundedRectangle(cornerRadius: 14)
+                .fill(backgroundColor)
+                .shadow(color: Color.black.opacity(colorScheme == .dark ? 0.3 : 0.1), radius: 6, x: 0, y: 2)
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: 14)
+                .stroke(borderColor, lineWidth: 1)
+        )
+        .task {
+            // Defer loading to let UI settle after view appears
+            try? await Task.sleep(nanoseconds: 100_000_000) // 0.1s
+            playback.loadDuration()
+            await withCheckedContinuation { continuation in
+                WaveformCache.shared.waveform(for: url, completion: { bins in
+                    waveform = bins
+                    continuation.resume()
+                })
+            }
+        }
+        .onChange(of: url) { newValue in
+            WaveformCache.shared.waveform(for: newValue, completion: { bins in
+                self.waveform = bins
+            })
+            playback.replaceURL(newValue)
+        }
+        .onDisappear {
+            playback.stop()
+        }
+    }
+}

bitchat/Views/Media/WaveformView.swift

@@ -0,0 +1,67 @@
+import SwiftUI
+
+struct WaveformView: View {
+    let samples: [Float]
+    let playbackProgress: Double
+    let sendProgress: Double?
+    let onSeek: ((Double) -> Void)?
+    let isInteractive: Bool
+
+    private var clampedPlayback: Double {
+        max(0, min(1, playbackProgress))
+    }
+
+    private var clampedSend: Double? {
+        guard let sendProgress = sendProgress else { return nil }
+        return max(0, min(1, sendProgress))
+    }
+
+    var body: some View {
+        GeometryReader { geometry in
+            ZStack {
+                Canvas { context, size in
+                    guard !samples.isEmpty else { return }
+                    let width = max(size.width, 1)
+                    let height = max(size.height, 1)
+                    let barWidth = max(width / CGFloat(samples.count), 1)
+                    for (index, sample) in samples.enumerated() {
+                        let normalized = max(0, min(sample, 1))
+                        let barHeight = CGFloat(normalized) * height
+                        let originX = CGFloat(index) * barWidth
+                        let rect = CGRect(
+                            x: originX,
+                            y: (height - barHeight) / 2,
+                            width: max(barWidth * 0.7, 1),
+                            height: barHeight
+                        )
+                        let binPosition = Double(index) / Double(samples.count)
+                        let color: Color
+                        if binPosition <= clampedPlayback {
+                            color = Color.green
+                        } else if let send = clampedSend, binPosition <= send {
+                            color = Color.blue
+                        } else {
+                            color = Color.gray.opacity(0.35)
+                        }
+                        context.fill(Path(rect), with: .color(color))
+                    }
+                }
+                .frame(width: geometry.size.width, height: geometry.size.height)
+
+                if isInteractive, let onSeek = onSeek {
+                    Color.clear
+                        .contentShape(Rectangle())
+                        .gesture(
+                            DragGesture(minimumDistance: 0)
+                                .onEnded { value in
+                                    guard geometry.size.width > 0 else { return }
+                                    let fraction = max(0, min(1, value.location.x / geometry.size.width))
+                                    onSeek(fraction)
+                                }
+                        )
+                }
+            }
+        }
+        .frame(height: 48)
+    }
+}

bitchat/Views/MeshPeerList.swift

@@ -4,9 +4,9 @@ struct MeshPeerList: View {
     @ObservedObject var viewModel: ChatViewModel
     let textColor: Color
     let secondaryTextColor: Color
-    let onTapPeer: (String) -> Void
-    let onToggleFavorite: (String) -> Void
-    let onShowFingerprint: (String) -> Void
+    let onTapPeer: (PeerID) -> Void
+    let onToggleFavorite: (PeerID) -> Void
+    let onShowFingerprint: (PeerID) -> Void
     @Environment(\.colorScheme) var colorScheme
 
     @State private var orderedIDs: [String] = []
@@ -21,8 +21,8 @@ struct MeshPeerList: View {
         let myPeerID = viewModel.meshService.myPeerID
         let mapped: [(peer: BitchatPeer, isMe: Bool, hasUnread: Bool, enc: EncryptionStatus)] = viewModel.allPeers.map { peer in
             let isMe = peer.peerID == myPeerID
-            let hasUnread = viewModel.hasUnreadMessages(for: peer.peerID.id)
-            let enc = viewModel.getEncryptionStatus(for: peer.peerID.id)
+            let hasUnread = viewModel.hasUnreadMessages(for: peer.peerID)
+            let enc = viewModel.getEncryptionStatus(for: peer.peerID)
             return (peer, isMe, hasUnread, enc)
         }
         // Stable visual order without mutating state here
@@ -47,7 +47,7 @@ struct MeshPeerList: View {
                     let peer = item.peer
                     let isMe = item.isMe
                     HStack(spacing: 4) {
-                        let assigned = viewModel.colorForMeshPeer(id: peer.peerID.id, isDark: colorScheme == .dark)
+                        let assigned = viewModel.colorForMeshPeer(id: peer.peerID, isDark: colorScheme == .dark)
                         let baseColor = isMe ? Color.orange : assigned
                         if isMe {
                             Image(systemName: "person.fill")
@@ -89,7 +89,7 @@ struct MeshPeerList: View {
                             }
                         }
 
-                        if !isMe, viewModel.isPeerBlocked(peer.peerID.id) {
+                        if !isMe, viewModel.isPeerBlocked(peer.peerID) {
                             Image(systemName: "nosign")
                                 .font(.bitchatSystem(size: 10))
                                 .foregroundColor(.red)
@@ -105,7 +105,7 @@ struct MeshPeerList: View {
                                 }
                             } else {
                                 // Offline: prefer showing verified badge from persisted fingerprints
-                                if let fp = viewModel.getFingerprint(for: peer.peerID.id),
+                                if let fp = viewModel.getFingerprint(for: peer.peerID),
                                    viewModel.verifiedFingerprints.contains(fp) {
                                     Image(systemName: "checkmark.seal.fill")
                                         .font(.bitchatSystem(size: 10))
@@ -130,7 +130,7 @@ struct MeshPeerList: View {
                         }
 
                         if !isMe {
-                            Button(action: { onToggleFavorite(peer.peerID.id) }) {
+                            Button(action: { onToggleFavorite(peer.peerID) }) {
                                 Image(systemName: (peer.favoriteStatus?.isFavorite ?? false) ? "star.fill" : "star")
                                     .font(.bitchatSystem(size: 12))
                                     .foregroundColor((peer.favoriteStatus?.isFavorite ?? false) ? .yellow : secondaryTextColor)
@@ -142,8 +142,8 @@ struct MeshPeerList: View {
                     .padding(.vertical, 4)
                     .padding(.top, idx == 0 ? 10 : 0)
                     .contentShape(Rectangle())
-                    .onTapGesture { if !isMe { onTapPeer(peer.peerID.id) } }
-                    .onTapGesture(count: 2) { if !isMe { onShowFingerprint(peer.peerID.id) } }
+                    .onTapGesture { if !isMe { onTapPeer(peer.peerID) } }
+                    .onTapGesture(count: 2) { if !isMe { onShowFingerprint(peer.peerID) } }
                 }
             }
             // Seed and update order outside result builder

bitchat/Views/VerificationViews.swift

@@ -292,7 +292,7 @@ struct VerificationSheetView: View {
     private var boxColor: Color { Color.gray.opacity(0.1) }
 
     private func myQRString() -> String {
-        let npub = try? NostrIdentityBridge.getCurrentNostrIdentity()?.npub
+        let npub = try? viewModel.idBridge.getCurrentNostrIdentity()?.npub
         return VerificationService.shared.buildMyQRString(nickname: viewModel.nickname, npub: npub) ?? ""
     }
 
@@ -388,10 +388,6 @@ struct VerificationSheetView: View {
             .padding(.vertical, 14)
         }
         .background(backgroundColor)
-        #if os(iOS)
-        .presentationDetents([.large])
-        .presentationDragIndicator(.visible)
-        #endif
         .onDisappear { showingScanner = false }
     }
 }

bitchat/bitchat-macOS.entitlements

@@ -10,11 +10,19 @@
 	</array>
 	<key>com.apple.security.device.bluetooth</key>
 	<true/>
+	<key>com.apple.security.device.microphone</key>
+	<true/>
 	<key>com.apple.security.personal-information.location</key>
 	<true/>
 	<key>com.apple.security.network.client</key>
 	<true/>
 	<key>com.apple.security.network.server</key>
 	<true/>
+	<key>com.apple.security.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.files.user-selected.read-write</key>
+	<true/>
+	<key>com.apple.security.assets.pictures.read-only</key>
+	<true/>
 </dict>
 </plist>

bitchatShareExtension/Localization/Localizable.xcstrings

@@ -108,6 +108,13 @@
             "value": "공유된 링크",
             "comment": "Fallback title when saving a shared link"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "paylaşılan bağlantı",
+            "comment": "Fallback title when saving a shared link"
+          }
         }
       }
     },
@@ -218,6 +225,13 @@
             "value": "링크를 인코딩하는 데 실패했습니다",
             "comment": "Shown when the share payload cannot be encoded"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "bağlantı kodlanamadı",
+            "comment": "Shown when the share payload cannot be encoded"
+          }
         }
       }
     },
@@ -328,6 +342,13 @@
             "value": "공유할 수 있는 내용이 없습니다",
             "comment": "Shown when provided content cannot be shared"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "paylaşılabilir içerik yok",
+            "comment": "Shown when provided content cannot be shared"
+          }
         }
       }
     },
@@ -438,6 +459,13 @@
             "value": "공유할 내용이 없습니다",
             "comment": "Shown when the share extension receives no content"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "paylaşılacak bir şey yok",
+            "comment": "Shown when the share extension receives no content"
+          }
         }
       }
     },
@@ -548,6 +576,13 @@
             "value": "✓ bitchat으로 링크를 공유했습니다",
             "comment": "Confirmation after successfully sharing a link"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "✓ bitchat'e bağlantı paylaşıldı",
+            "comment": "Confirmation after successfully sharing a link"
+          }
         }
       }
     },
@@ -658,6 +693,13 @@
             "value": "✓ bitchat으로 텍스트를 공유했습니다",
             "comment": "Confirmation after successfully sharing text"
           }
+        },
+        "tr": {
+          "stringUnit": {
+            "state": "translated",
+            "value": "✓ bitchat'e metin paylaşıldı",
+            "comment": "Confirmation after successfully sharing text"
+          }
         }
       }
     }

bitchatTests/BLEServiceTests.swift

@@ -6,122 +6,128 @@
 // For more information, see <https://unlicense.org>
 //
 
-import XCTest
+import Testing
 import CoreBluetooth
 @testable import bitchat
 
-final class BLEServiceTests: XCTestCase {
+struct BLEServiceTests {
+    private let service: MockBLEService
+    private let myUUID = UUID()
+    private let bus = MockBLEBus()
     
-    var service: MockBLEService!
-    
-    override func setUp() {
-        super.setUp()
-        service = MockBLEService()
-        service.myPeerID = "TEST1234"
+    init() {
+        service = MockBLEService.init(bus: bus)
+        service.myPeerID = PeerID(str: myUUID.uuidString)
         service.mockNickname = "TestUser"
     }
     
-    override func tearDown() {
-        service = nil
-        super.tearDown()
-    }
-    
     // MARK: - Basic Functionality Tests
     
-    func testServiceInitialization() {
-        XCTAssertNotNil(service)
-        XCTAssertEqual(service.myPeerID, "TEST1234")
-        XCTAssertEqual(service.myNickname, "TestUser")
+    @Test func serviceInitialization() {
+        #expect(service.myPeerID == PeerID(str: myUUID.uuidString))
+        #expect(service.myNickname == "TestUser")
     }
     
-    func testPeerConnection() {
-        // Test connecting a peer
-        service.simulateConnectedPeer("PEER5678")
-        XCTAssertTrue(service.isPeerConnected("PEER5678"))
-        XCTAssertEqual(service.getConnectedPeers().count, 1)
+    @Test func peerConnection() {
+        let somePeerID = PeerID(str: UUID().uuidString)
         
-        // Test disconnecting a peer
-        service.simulateDisconnectedPeer("PEER5678")
-        XCTAssertFalse(service.isPeerConnected("PEER5678"))
-        XCTAssertEqual(service.getConnectedPeers().count, 0)
+        service.simulateConnectedPeer(somePeerID)
+        #expect(service.isPeerConnected(somePeerID))
+        #expect(service.getConnectedPeers().count == 1)
+        
+        service.simulateDisconnectedPeer(somePeerID)
+        #expect(!service.isPeerConnected(somePeerID))
+        #expect(service.getConnectedPeers().count == 0)
     }
     
-    func testMultiplePeerConnections() {
-        service.simulateConnectedPeer("PEER1")
-        service.simulateConnectedPeer("PEER2")
-        service.simulateConnectedPeer("PEER3")
+    @Test func multiplePeerConnections() {
+        let peerID1 = PeerID(str: UUID().uuidString)
+        let peerID2 = PeerID(str: UUID().uuidString)
+        let peerID3 = PeerID(str: UUID().uuidString)
 
-        XCTAssertEqual(service.getConnectedPeers().count, 3)
-        XCTAssertTrue(service.isPeerConnected("PEER1"))
-        XCTAssertTrue(service.isPeerConnected("PEER2"))
-        XCTAssertTrue(service.isPeerConnected("PEER3"))
+        service.simulateConnectedPeer(peerID1)
+        service.simulateConnectedPeer(peerID2)
+        service.simulateConnectedPeer(peerID3)
         
-        service.simulateDisconnectedPeer("PEER2")
-        XCTAssertEqual(service.getConnectedPeers().count, 2)
-        XCTAssertFalse(service.isPeerConnected("PEER2"))
+        #expect(service.getConnectedPeers().count == 3)
+        #expect(service.isPeerConnected(peerID1))
+        #expect(service.isPeerConnected(peerID2))
+        #expect(service.isPeerConnected(peerID3))
+        
+        service.simulateDisconnectedPeer(peerID2)
+        #expect(service.getConnectedPeers().count == 2)
+        #expect(!service.isPeerConnected(peerID2))
     }
     
     // MARK: - Message Sending Tests
     
-    func testSendPublicMessage() {
-        let expectation = XCTestExpectation(description: "Message sent")
-        
+    @Test func sendPublicMessage() async throws {
+        try await confirmation { receivedPublicMessage in
             let delegate = MockBitchatDelegate { message in
-            XCTAssertEqual(message.content, "Hello, world!")
-            XCTAssertEqual(message.sender, "TestUser")
-            XCTAssertFalse(message.isPrivate)
-            expectation.fulfill()
+                #expect(message.content == "Hello, world!")
+                #expect(message.sender == "TestUser")
+                #expect(!message.isPrivate)
+                receivedPublicMessage()
             }
             service.delegate = delegate
-        
             service.sendMessage("Hello, world!")
             
-        wait(for: [expectation], timeout: 1.0)
-        XCTAssertEqual(service.sentMessages.count, 1)
+            // Allow async processing
+            try await sleep(0.5)
+        }
+        #expect(service.sentMessages.count == 1)
     }
     
-    func testSendPrivateMessage() {
-        let expectation = XCTestExpectation(description: "Private message sent")
-        
+    @Test func sendPrivateMessage() async throws {
+        try await confirmation { receivedPrivateMessage in
             let delegate = MockBitchatDelegate { message in
-            XCTAssertEqual(message.content, "Secret message")
-            XCTAssertEqual(message.sender, "TestUser")
-            XCTAssertTrue(message.isPrivate)
-            XCTAssertEqual(message.recipientNickname, "Bob")
-            expectation.fulfill()
+                #expect(message.content == "Secret message")
+                #expect(message.sender == "TestUser")
+                #expect(message.senderPeerID == PeerID(str: myUUID.uuidString))
+                #expect(message.isPrivate)
+                #expect(message.recipientNickname == "Bob")
+                receivedPrivateMessage()
             }
             service.delegate = delegate
+            service.sendPrivateMessage(
+                "Secret message",
+                to: PeerID(str: UUID().uuidString),
+                recipientNickname: "Bob",
+                messageID: "MSG123"
+            )
             
-        service.sendPrivateMessage("Secret message", to: "PEER5678", recipientNickname: "Bob", messageID: "MSG123")
-        
-        wait(for: [expectation], timeout: 1.0)
-        XCTAssertEqual(service.sentMessages.count, 1)
+            // Allow async processing
+            try await sleep(0.5)
+        }
+        #expect(service.sentMessages.count == 1)
     }
     
-    func testSendMessageWithMentions() {
-        let expectation = XCTestExpectation(description: "Message with mentions sent")
-        
+    @Test func sendMessageWithMentions() async throws {
+        try await confirmation { receivedMessageWithMentions in
             let delegate = MockBitchatDelegate { message in
-            XCTAssertEqual(message.content, "@alice @bob check this out")
-            XCTAssertEqual(message.mentions, ["alice", "bob"])
-            expectation.fulfill()
+                #expect(message.content == "@alice @bob check this out")
+                #expect(message.mentions == ["alice", "bob"])
+                receivedMessageWithMentions()
             }
             service.delegate = delegate
-        
             service.sendMessage("@alice @bob check this out", mentions: ["alice", "bob"])
             
-        wait(for: [expectation], timeout: 1.0)
+            // Allow async processing
+            try await sleep(0.5)
+        }
     }
     
     // MARK: - Message Reception Tests
     
-    func testSimulateIncomingMessage() {
-        let expectation = XCTestExpectation(description: "Message received")
+    @Test func simulateIncomingMessage() async throws {
+        try await confirmation { receiveMessage in
+            let peerID = PeerID(str: UUID().uuidString)
             
             let delegate = MockBitchatDelegate { message in
-            XCTAssertEqual(message.content, "Incoming message")
-            XCTAssertEqual(message.sender, "RemoteUser")
-            expectation.fulfill()
+                #expect(message.content == "Incoming message")
+                #expect(message.sender == "RemoteUser")
+                #expect(message.senderPeerID == peerID)
+                receiveMessage()
             }
             service.delegate = delegate
             
@@ -134,21 +140,24 @@ final class BLEServiceTests: XCTestCase {
                 originalSender: nil,
                 isPrivate: false,
                 recipientNickname: nil,
-            senderPeerID: "REMOTE123",
+                senderPeerID: peerID,
                 mentions: nil
             )
-        
             service.simulateIncomingMessage(incomingMessage)
             
-        wait(for: [expectation], timeout: 1.0)
+            // Allow async processing
+            try await sleep(0.5)
+        }
     }
     
-    func testSimulateIncomingPacket() {
-        let expectation = XCTestExpectation(description: "Packet processed")
+    @Test func simulateIncomingPacket() async throws {
+        try await confirmation { processPacket in
+            let peerID = PeerID(str: UUID().uuidString)
             
             let delegate = MockBitchatDelegate { message in
-            XCTAssertEqual(message.content, "Packet message")
-            expectation.fulfill()
+                #expect(message.content == "Packet message")
+                #expect(message.senderPeerID == peerID)
+                processPacket()
             }
             service.delegate = delegate
             
@@ -161,18 +170,15 @@ final class BLEServiceTests: XCTestCase {
                 originalSender: nil,
                 isPrivate: false,
                 recipientNickname: nil,
-            senderPeerID: "PACKET123",
+                senderPeerID: peerID,
                 mentions: nil
             )
             
-        guard let payload = message.toBinaryPayload() else {
-            XCTFail("Failed to create binary payload")
-            return
-        }
+            let payload = try #require(message.toBinaryPayload(), "Failed to create binary payload")
             
             let packet = BitchatPacket(
                 type: 0x01,
-            senderID: "PACKET123".data(using: .utf8)!,
+                senderID: peerID.id.data(using: .utf8)!,
                 recipientID: nil,
                 timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
                 payload: payload,
@@ -182,56 +188,61 @@ final class BLEServiceTests: XCTestCase {
             
             service.simulateIncomingPacket(packet)
             
-        wait(for: [expectation], timeout: 1.0)
+            // Allow async processing
+            try await sleep(0.5)
+        }
     }
     
     // MARK: - Peer Nickname Tests
     
-    func testGetPeerNicknames() {
-        service.simulateConnectedPeer("PEER1")
-        service.simulateConnectedPeer("PEER2")
+    @Test func getPeerNicknames() {
+        let peerID1 = PeerID(str: UUID().uuidString)
+        let peerID2 = PeerID(str: UUID().uuidString)
+
+        service.simulateConnectedPeer(peerID1)
+        service.simulateConnectedPeer(peerID2)
         
         let nicknames = service.getPeerNicknames()
-        XCTAssertEqual(nicknames.count, 2)
-        XCTAssertEqual(nicknames["PEER1"], "MockPeer_PEER1")
-        XCTAssertEqual(nicknames["PEER2"], "MockPeer_PEER2")
+        #expect(nicknames.count == 2)
+        #expect(nicknames[peerID1] == "MockPeer_\(peerID1)")
+        #expect(nicknames[peerID2] == "MockPeer_\(peerID2)")
     }
     
     // MARK: - Service State Tests
     
-    func testStartStopServices() {
-        // These are mock implementations, just ensure they don't crash
+    @Test func startStopServices() {
         service.startServices()
         service.stopServices()
-        
-        // Service should still be functional after start/stop
-        service.simulateConnectedPeer("PEER999")
-        XCTAssertTrue(service.isPeerConnected("PEER999"))
+        let somePeerID = PeerID(str: UUID().uuidString)
+        service.simulateConnectedPeer(somePeerID)
+        #expect(service.isPeerConnected(somePeerID))
     }
     
     // MARK: - Message Delivery Handler Tests
     
-    func testMessageDeliveryHandler() {
-        let expectation = XCTestExpectation(description: "Delivery handler called")
-        
+    @Test func messageDeliveryHandler() async throws {
+        try await confirmation { deliveryHandler in
             service.packetDeliveryHandler = { packet in
                 if let msg = BitchatMessage(packet.payload) {
-                XCTAssertEqual(msg.content, "Test delivery")
-                expectation.fulfill()
+                    #expect(msg.content == "Test delivery")
+                    deliveryHandler()
                 }
             }
-        
             service.sendMessage("Test delivery")
             
-        wait(for: [expectation], timeout: 1.0)
+            // Allow async processing
+            try await sleep(0.5)
+        }
     }
     
-    func testPacketDeliveryHandler() {
-        let expectation = XCTestExpectation(description: "Packet handler called")
+    @Test func packetDeliveryHandler() async throws {
+        try await confirmation("Packet handler called") { packetHandler in
+            let peerID = PeerID(str: UUID().uuidString)
             
             service.packetDeliveryHandler = { packet in
-            XCTAssertEqual(packet.type, 0x01)
-            expectation.fulfill()
+                #expect(packet.type == 0x01)
+                #expect(packet.senderID == Data(peerID.id.utf8))
+                packetHandler()
             }
             
             let message = BitchatMessage(
@@ -243,18 +254,15 @@ final class BLEServiceTests: XCTestCase {
                 originalSender: nil,
                 isPrivate: false,
                 recipientNickname: nil,
-            senderPeerID: "TEST123",
+                senderPeerID: peerID,
                 mentions: nil
             )
             
-        guard let payload = message.toBinaryPayload() else {
-            XCTFail("Failed to create payload")
-            return
-        }
+            let payload = try #require(message.toBinaryPayload(), "Failed to create payload")
             
             let packet = BitchatPacket(
                 type: 0x01,
-            senderID: "TEST123".data(using: .utf8)!,
+                senderID: peerID.id.data(using: .utf8)!,
                 recipientID: nil,
                 timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
                 payload: payload,
@@ -264,7 +272,9 @@ final class BLEServiceTests: XCTestCase {
             
             service.simulateIncomingPacket(packet)
             
-        wait(for: [expectation], timeout: 1.0)
+            // Allow async processing
+            try await sleep(0.5)
+        }
     }
 }
 

bitchatTests/CommandProcessorTests.swift

@@ -1,54 +1,42 @@
-import XCTest
+import Testing
 @testable import bitchat
 
-final class CommandProcessorTests: XCTestCase {
-    
-    var identityManager: MockIdentityManager!
-    
-    override func setUp() {
-        super.setUp()
-        // Provide a minimal identity manager for commands that query identity/block lists
-        identityManager = MockIdentityManager(MockKeychain())
-    }
-    
-    override func tearDown() {
-        identityManager = nil
-        super.tearDown()
-    }
+struct CommandProcessorTests {
+    private var identityManager = MockIdentityManager(MockKeychain())
 
     @MainActor
-    func test_slap_notFoundGrammar() {
+    @Test func slapNotFoundGrammar() {
         let processor = CommandProcessor(chatViewModel: nil, meshService: nil, identityManager: identityManager)
         let result = processor.process("/slap @system")
         switch result {
         case .error(let message):
-            XCTAssertEqual(message, "cannot slap system: not found")
+            #expect(message == "cannot slap system: not found")
         default:
-            XCTFail("Expected error result")
+            Issue.record("Expected error result")
         }
     }
 
     @MainActor
-    func test_hug_notFoundGrammar() {
+    @Test func hugNotFoundGrammar() {
         let processor = CommandProcessor(chatViewModel: nil, meshService: nil, identityManager: identityManager)
         let result = processor.process("/hug @system")
         switch result {
         case .error(let message):
-            XCTAssertEqual(message, "cannot hug system: not found")
+            #expect(message == "cannot hug system: not found")
         default:
-            XCTFail("Expected error result")
+            Issue.record("Expected error result")
         }
     }
     
     @MainActor
-    func test_slap_usageMessage() {
+    @Test func slapUsageMessage() {
         let processor = CommandProcessor(chatViewModel: nil, meshService: nil, identityManager: identityManager)
         let result = processor.process("/slap")
         switch result {
         case .error(let message):
-            XCTAssertEqual(message, "usage: /slap <nickname>")
+            #expect(message == "usage: /slap <nickname>")
         default:
-            XCTFail("Expected error result for usage message")
+            Issue.record("Expected error result for usage message")
         }
     }
 }

bitchatTests/EndToEnd/PrivateChatE2ETests.swift

@@ -11,21 +11,19 @@ import CryptoKit
 import struct Foundation.UUID
 @testable import bitchat
 
-// TODO: Remove once MockBLEService is refactored to fix race condition
-@Suite(.serialized)
 struct PrivateChatE2ETests {
     
     private let alice: MockBLEService
     private let bob: MockBLEService
     private let charlie: MockBLEService
-    private let mockKeychain: MockKeychain
+    private let mockKeychain = MockKeychain()
+    private let bus = MockBLEBus()
     
     init() {
         // Create services with unique peer IDs to avoid any collision
-        alice = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname1)
-        bob = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname2)
-        charlie = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname3)
-        mockKeychain = MockKeychain()
+        alice = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname1, bus: bus)
+        bob = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname2, bus: bus)
+        charlie = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname3, bus: bus)
     }
     
     // MARK: - Basic Private Messaging Tests
@@ -53,7 +51,7 @@ struct PrivateChatE2ETests {
             )
 
             // Wait a bit to ensure message would have been delivered if it was going to be
-            try? await Task.sleep(nanoseconds: UInt64(TestConstants.shortTimeout * 1_000_000_000))
+            try? await sleep(0.1)
         }
 
         #expect(!bobReceivedMessage, "Bob should not have received the message")
@@ -171,7 +169,7 @@ struct PrivateChatE2ETests {
             // Send encrypted private message
             alice.sendPrivateMessage(
                 TestConstants.testMessage1,
-                to: TestConstants.testPeerID2,
+                to: bob.peerID,
                 recipientNickname: TestConstants.testNickname2
             )
         }
@@ -235,7 +233,7 @@ struct PrivateChatE2ETests {
             for i in 0..<messageCount {
                 alice.sendPrivateMessage(
                     "Private message \(i)",
-                    to: TestConstants.testPeerID2,
+                    to: bob.peerID,
                     recipientNickname: TestConstants.testNickname2
                 )
             }
@@ -254,7 +252,7 @@ struct PrivateChatE2ETests {
 
             alice.sendPrivateMessage(
                 TestConstants.testLongMessage,
-                to: TestConstants.testPeerID2,
+                to: bob.peerID,
                 recipientNickname: TestConstants.testNickname2
             )
         }

bitchatTests/EndToEnd/PublicChatE2ETests.swift

@@ -10,22 +10,22 @@ import Testing
 import struct Foundation.UUID
 @testable import bitchat
 
-@Suite(.serialized)
 struct PublicChatE2ETests {
     
     private let alice: MockBLEService
     private let bob: MockBLEService
     private let charlie: MockBLEService
     private let david: MockBLEService
+    private let bus = MockBLEBus()
     
     private var receivedMessages: [String: [BitchatMessage]] = [:]
     
     init() {
         // Create mock services with unique peer IDs to avoid any collision
-        alice = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname1)
-        bob = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname2)
-        charlie = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname3)
-        david = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname4)
+        alice = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname1, bus: bus)
+        bob = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname2, bus: bus)
+        charlie = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname3, bus: bus)
+        david = MockBLEService(peerID: PeerID(str: UUID().uuidString), nickname: TestConstants.testNickname4, bus: bus)
     }
     
     // MARK: - Basic Broadcasting Tests

bitchatTests/Fragmentation/FragmentationTests.swift

@@ -15,20 +15,26 @@ struct FragmentationTests {
     
     private let mockKeychain: MockKeychain
     private let mockIdentityManager: MockIdentityManager
+    private let idBridge: NostrIdentityBridge
     
     init() {
         mockKeychain = MockKeychain()
         mockIdentityManager = MockIdentityManager(mockKeychain)
+        idBridge = NostrIdentityBridge(keychain: MockKeychainHelper())
     }
     
     @Test("Reassembly from fragments delivers a public message")
     func reassemblyFromFragmentsDeliversPublicMessage() async throws {
-        let ble = BLEService(keychain: mockKeychain, identityManager: mockIdentityManager)
+        let ble = BLEService(
+            keychain: mockKeychain,
+            idBridge: idBridge,
+            identityManager: mockIdentityManager
+        )
         let capture = CaptureDelegate()
         ble.delegate = capture
         
         // Construct a big packet (3KB) from a remote sender (not our own ID)
-        let remoteShortID: PeerID = "1122334455667788"
+        let remoteShortID = PeerID(str: "1122334455667788")
         let original = makeLargePublicPacket(senderShortHex: remoteShortID, size: 3_000)
         
         // Use a small fragment size to ensure multiple pieces
@@ -39,15 +45,15 @@ struct FragmentationTests {
         
         // Inject fragments spaced out to avoid concurrent mutation inside BLEService
         for (i, fragment) in shuffled.enumerated() {
-            let delay = UInt64(5 * i) * 1_000_000 // nanoseconds
+            let delay = 5 * Double(i) * 0.001
             Task {
-                try await Task.sleep(nanoseconds: delay)
+                try await sleep(delay)
                 ble._test_handlePacket(fragment, fromPeerID: remoteShortID)
             }
         }
         
         // Allow async processing
-        try await Task.sleep(nanoseconds: 500_000_000) // 0.5s
+        try await sleep(0.5)
         
         #expect(capture.publicMessages.count == 1)
         #expect(capture.publicMessages.first?.content.count == 3_000)
@@ -55,11 +61,15 @@ struct FragmentationTests {
     
     @Test("Duplicate fragment does not break reassembly")
     func duplicateFragmentDoesNotBreakReassembly() async throws {
-        let ble = BLEService(keychain: mockKeychain, identityManager: mockIdentityManager)
+        let ble = BLEService(
+            keychain: mockKeychain,
+            idBridge: idBridge,
+            identityManager: mockIdentityManager
+        )
         let capture = CaptureDelegate()
         ble.delegate = capture
         
-        let remoteShortID: PeerID = "A1B2C3D4E5F60708"
+        let remoteShortID = PeerID(str: "A1B2C3D4E5F60708")
         let original = makeLargePublicPacket(senderShortHex: remoteShortID, size: 2048)
         var frags = fragmentPacket(original, fragmentSize: 300)
         
@@ -69,27 +79,87 @@ struct FragmentationTests {
         }
         
         for (i, fragment) in frags.enumerated() {
-            let delay = UInt64(5 * i) * 1_000_000 // nanoseconds
+            let delay = 5 * Double(i) * 0.001
             Task {
-                try await Task.sleep(nanoseconds: delay)
+                try await sleep(delay)
                 ble._test_handlePacket(fragment, fromPeerID: remoteShortID)
             }
         }
         
         // Allow async processing
-        try await Task.sleep(nanoseconds: 500_000_000) // 0.5s
+        try await sleep(0.5)
 
         #expect(capture.publicMessages.count == 1)
         #expect(capture.publicMessages.first?.content.count == 2048)
     }
 
-    @Test("Invalid fragment header is ignored")
-    func invalidFragmentHeaderIsIgnored() async throws {
-        let ble = BLEService(keychain: mockKeychain, identityManager: mockIdentityManager)
+    @Test("Max-sized file transfer survives reassembly")
+    func maxSizedFileTransferSurvivesReassembly() async throws {
+        let ble = BLEService(
+            keychain: mockKeychain,
+            idBridge: idBridge,
+            identityManager: mockIdentityManager
+        )
         let capture = CaptureDelegate()
         ble.delegate = capture
 
-        let remoteShortID: PeerID = "0011223344556677"
+        let remoteID = PeerID(str: "CAFEBABECAFEBABE")
+        let fileContent = Data(repeating: 0x42, count: FileTransferLimits.maxPayloadBytes)
+        let filePacket = BitchatFilePacket(
+            fileName: "limit.bin",
+            fileSize: UInt64(fileContent.count),
+            mimeType: "application/octet-stream",
+            content: fileContent
+        )
+        let encoded = try #require(filePacket.encode(), "File packet encoding failed")
+
+        let packet = BitchatPacket(
+            type: MessageType.fileTransfer.rawValue,
+            senderID: Data(hexString: remoteID.id) ?? Data(),
+            recipientID: nil,
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: encoded,
+            signature: nil,
+            ttl: 7,
+            version: 2
+        )
+
+        let fragments = fragmentPacket(packet, fragmentSize: 4096, pad: false)
+        #expect(!fragments.isEmpty)
+
+        for (i, fragment) in fragments.enumerated() {
+            let delay = 5 * Double(i) * 0.001
+            Task {
+                try await sleep(delay)
+                ble._test_handlePacket(fragment, fromPeerID: remoteID)
+            }
+        }
+
+        try await sleep(1.0)
+
+        let message = try #require(capture.receivedMessages.first, "Expected file transfer message")
+        #expect(message.content.hasPrefix("[file]"))
+
+        if let fileName = message.content.split(separator: " ").last {
+            let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+            let filesRoot = base.appendingPathComponent("files", isDirectory: true)
+            let incoming = filesRoot.appendingPathComponent("files/incoming", isDirectory: true)
+            let url = incoming.appendingPathComponent(String(fileName))
+            try? FileManager.default.removeItem(at: url)
+        }
+    }
+    
+    @Test("Invalid fragment header is ignored")
+    func invalidFragmentHeaderIsIgnored() async throws {
+        let ble = BLEService(
+            keychain: mockKeychain,
+            idBridge: idBridge,
+            identityManager: mockIdentityManager
+        )
+        let capture = CaptureDelegate()
+        ble.delegate = capture
+        
+        let remoteShortID = PeerID(str: "0011223344556677")
         let original = makeLargePublicPacket(senderShortHex: remoteShortID, size: 1000)
         let fragments = fragmentPacket(original, fragmentSize: 250)
         
@@ -110,15 +180,15 @@ struct FragmentationTests {
         }
         
         for (i, fragment) in corrupted.enumerated() {
-            let delay = UInt64(5 * i) * 1_000_000 // nanoseconds
+            let delay = 5 * Double(i) * 0.001
             Task {
-                try await Task.sleep(nanoseconds: delay)
+                try await sleep(delay)
                 ble._test_handlePacket(fragment, fromPeerID: remoteShortID)
             }
         }
         
         // Allow async processing
-        try await Task.sleep(nanoseconds: 500_000_000) // 0.5s
+        try await sleep(0.5)
 
         // Should not deliver since one fragment is invalid and reassembly can't complete
         #expect(capture.publicMessages.isEmpty)
@@ -128,7 +198,10 @@ struct FragmentationTests {
 extension FragmentationTests {
     private final class CaptureDelegate: BitchatDelegate {
         var publicMessages: [(peerID: PeerID, nickname: String, content: String)] = []
-        func didReceiveMessage(_ message: BitchatMessage) {}
+        var receivedMessages: [BitchatMessage] = []
+        func didReceiveMessage(_ message: BitchatMessage) {
+            receivedMessages.append(message)
+        }
         func didConnectToPeer(_ peerID: PeerID) {}
         func didDisconnectFromPeer(_ peerID: PeerID) {}
         func didUpdatePeerList(_ peers: [PeerID]) {}
@@ -159,8 +232,8 @@ extension FragmentationTests {
     }
 
     // Helper: fragment a packet using the same header format BLEService expects
-    private func fragmentPacket(_ packet: BitchatPacket, fragmentSize: Int, fragmentID: Data? = nil) -> [BitchatPacket] {
-        let fullData = packet.toBinaryData() ?? Data()
+    private func fragmentPacket(_ packet: BitchatPacket, fragmentSize: Int, fragmentID: Data? = nil, pad: Bool = true) -> [BitchatPacket] {
+        guard let fullData = packet.toBinaryData(padding: pad) else { return [] }
         let fid = fragmentID ?? Data((0..<8).map { _ in UInt8.random(in: 0...255) })
         let chunks: [Data] = stride(from: 0, to: fullData.count, by: fragmentSize).map { off in
             Data(fullData[off..<min(off + fragmentSize, fullData.count)])

bitchatTests/GCSFilterTests.swift

@@ -1,22 +1,23 @@
-import XCTest
+import Testing
+import struct Foundation.Data
 @testable import bitchat
 
-final class GCSFilterTests: XCTestCase {
-    func testBuildFilterWithDuplicateIdsProducesStableEncoding() {
+struct GCSFilterTests {
+    @Test func buildFilterWithDuplicateIdsProducesStableEncoding() {
         let id = Data(repeating: 0xAB, count: 16)
         let ids = Array(repeating: id, count: 64)
 
         let params = GCSFilter.buildFilter(ids: ids, maxBytes: 128, targetFpr: 0.01)
-        XCTAssertGreaterThanOrEqual(params.m, 1)
+        #expect(params.m >= 1)
 
         let decoded = GCSFilter.decodeToSortedSet(p: params.p, m: params.m, data: params.data)
-        XCTAssertLessThanOrEqual(decoded.count, 1)
+        #expect(decoded.count <= 1)
     }
 
-    func testBucketAvoidsZeroCandidate() {
+    @Test func bucketAvoidsZeroCandidate() {
         let id = Data(repeating: 0x01, count: 16)
         let bucket = GCSFilter.bucket(for: id, modulus: 2)
-        XCTAssertNotEqual(bucket, 0)
-        XCTAssertLessThan(bucket, 2)
+        #expect(bucket != 0)
+        #expect(bucket < 2)
     }
 }

bitchatTests/GeohashBookmarksStoreTests.swift

@@ -1,52 +1,38 @@
-import XCTest
+import Testing
+import Foundation
 @testable import bitchat
 
-final class GeohashBookmarksStoreTests: XCTestCase {
-    let storeKey = "locationChannel.bookmarks"
-    var storage: UserDefaults!
-    var store: GeohashBookmarksStore!
+struct GeohashBookmarksStoreTests {
+    private let storeKey = "locationChannel.bookmarks"
+    private let storage = UserDefaults(suiteName: UUID().uuidString)!
+    private let store: GeohashBookmarksStore
 
-    override func setUp() {
-        super.setUp()
-        // Unique instance for each test to avoid race condition
-        storage = UserDefaults(suiteName: UUID().uuidString)
-        store = GeohashBookmarksStore(storage: storage!)
+    init() {
+        store = GeohashBookmarksStore(storage: storage)
     }
 
-    override func tearDown() {
-        storage.removeObject(forKey: storeKey)
-        store._resetForTesting()
-        store = nil
-        storage = nil
-        super.tearDown()
-    }
-
-    func testToggleAndNormalize() {
+    @Test func toggleAndNormalize() {
         // Start clean
-        XCTAssertTrue(store.bookmarks.isEmpty)
+        #expect(store.bookmarks.isEmpty)
 
         // Add with mixed case and hash prefix
         store.toggle("#U4PRUY")
-        XCTAssertTrue(store.isBookmarked("u4pruy"))
-        XCTAssertEqual(store.bookmarks.first, "u4pruy")
+        #expect(store.isBookmarked("u4pruy"))
+        #expect(store.bookmarks.first == "u4pruy")
 
         // Toggling again removes
         store.toggle("u4pruy")
-        XCTAssertFalse(store.isBookmarked("u4pruy"))
-        XCTAssertTrue(store.bookmarks.isEmpty)
+        #expect(!store.isBookmarked("u4pruy"))
+        #expect(store.bookmarks.isEmpty)
     }
 
-    func testPersistenceWritten() throws {
+    @Test func persistenceWritten() throws {
         store.toggle("ezs42")
         store.toggle("u4pruy")
-
         // Verify persisted JSON contains both (order not enforced here)
-        guard let data = storage.data(forKey: storeKey) else {
-            XCTFail("No persisted data found")
-            return
-        }
+        let data = try #require(storage.data(forKey: storeKey), "No persisted data found")
         let arr = try JSONDecoder().decode([String].self, from: data)
-        XCTAssertTrue(arr.contains("ezs42"))
-        XCTAssertTrue(arr.contains("u4pruy"))
+        #expect(arr.contains("ezs42"))
+        #expect(arr.contains("u4pruy"))
     }
 }

bitchatTests/GossipSyncManagerTests.swift

@@ -1,24 +1,28 @@
 import Foundation
-import XCTest
+import Testing
 @testable import bitchat
 
-final class GossipSyncManagerTests: XCTestCase {
-    func testConcurrentPacketIntakeAndSyncRequest() {
-        let manager = GossipSyncManager(myPeerID: "0102030405060708")
+struct GossipSyncManagerTests {
+
+    private let myPeerID = PeerID(str: "0102030405060708")
+    
+    @Test func concurrentPacketIntakeAndSyncRequest() async throws {
+        let manager = GossipSyncManager(myPeerID: myPeerID)
         let delegate = RecordingDelegate()
-        let sendExpectation = expectation(description: "sync request sent")
-        delegate.onSend = { sendExpectation.fulfill() }
         manager.delegate = delegate
 
+        try await confirmation("sync request sent") { sent in
+            delegate.onSend = {
+                sent()
+            }
+
             let iterations = 200
-        let group = DispatchGroup()
+            let senderID = try #require(Data(hexString: "1122334455667788"))
             
             for i in 0..<iterations {
-            group.enter()
-            DispatchQueue.global(qos: .userInitiated).async {
                 let packet = BitchatPacket(
                     type: MessageType.message.rawValue,
-                    senderID: Data(hexString: "1122334455667788") ?? Data(),
+                    senderID: senderID,
                     recipientID: nil,
                     timestamp: 1_000_000 + UInt64(i),
                     payload: Data([UInt8(truncatingIfNeeded: i)]),
@@ -26,25 +30,100 @@ final class GossipSyncManagerTests: XCTestCase {
                     ttl: 1
                 )
                 manager.onPublicPacketSeen(packet)
-                Thread.sleep(forTimeInterval: 0.001)
-                group.leave()
-            }
+                try await sleep(0.001)
             }
 
-        DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: .now() + 0.002) {
-            manager.scheduleInitialSyncToPeer("FFFFFFFFFFFFFFFF", delaySeconds: 0.0)
+            manager.scheduleInitialSyncToPeer(PeerID(str: "FFFFFFFFFFFFFFFF"), delaySeconds: 0.0)
+            try await sleep(0.002)
         }
 
-        group.wait()
-        wait(for: [sendExpectation], timeout: 2.0)
-
-        guard let lastPacket = delegate.lastPacket else {
-            XCTFail("Expected sync packet to be sent")
-            return
+        let lastPacket = try #require(delegate.lastPacket, "Expected sync packet to be sent")
+        #expect(lastPacket.type == MessageType.requestSync.rawValue)
+        #expect(RequestSyncPacket.decode(from: lastPacket.payload) != nil)
     }
 
-        XCTAssertEqual(lastPacket.type, MessageType.requestSync.rawValue)
-        XCTAssertNotNil(RequestSyncPacket.decode(from: lastPacket.payload))
+    @Test func staleAnnouncementsArePurgedWithMessages() throws {
+        var config = GossipSyncManager.Config()
+        config.stalePeerCleanupIntervalSeconds = 0
+        config.stalePeerTimeoutSeconds = 5
+
+        let manager = GossipSyncManager(myPeerID: myPeerID, config: config)
+        let peerHex = "0011223344556677"
+        let senderData = try #require(Data(hexString: peerHex))
+        let initialTimestampMs = UInt64(Date().timeIntervalSince1970 * 1000)
+
+        let announcePacket = BitchatPacket(
+            type: MessageType.announce.rawValue,
+            senderID: senderData,
+            recipientID: nil,
+            timestamp: initialTimestampMs,
+            payload: Data(),
+            signature: nil,
+            ttl: 1
+        )
+
+        let messagePacket = BitchatPacket(
+            type: MessageType.message.rawValue,
+            senderID: senderData,
+            recipientID: nil,
+            timestamp: initialTimestampMs,
+            payload: Data([0x01]),
+            signature: nil,
+            ttl: 1
+        )
+
+        manager.onPublicPacketSeen(announcePacket)
+        manager.onPublicPacketSeen(messagePacket)
+
+        // Flush queue without triggering stale cleanup yet
+        manager._performMaintenanceSynchronously(now: Date())
+        #expect(manager._hasAnnouncement(for: PeerID(str: peerHex)))
+        #expect(manager._messageCount(for: PeerID(str: peerHex)) == 1)
+        
+        // Run cleanup past the timeout
+        let future = Date().addingTimeInterval(config.stalePeerTimeoutSeconds + 1)
+        manager._performMaintenanceSynchronously(now: future)
+        #expect(manager._hasAnnouncement(for: PeerID(str: peerHex)) == false)
+        #expect(manager._messageCount(for: PeerID(str: peerHex)) == 0)
+    }
+
+    @Test func ignoresAnnounceOlderThanStaleTimeout() throws {
+        var config = GossipSyncManager.Config()
+        config.stalePeerTimeoutSeconds = 5
+        config.maxMessageAgeSeconds = 100
+
+        let manager = GossipSyncManager(myPeerID: myPeerID, config: config)
+        let peerHex = "8899aabbccddeeff"
+        let senderData = try #require(Data(hexString: peerHex))
+        let staleTimestampMs = UInt64(Date().addingTimeInterval(-(config.stalePeerTimeoutSeconds + 1)).timeIntervalSince1970 * 1000)
+
+        let freshMessage = BitchatPacket(
+            type: MessageType.message.rawValue,
+            senderID: senderData,
+            recipientID: nil,
+            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
+            payload: Data([0xAA]),
+            signature: nil,
+            ttl: 1
+        )
+        manager.onPublicPacketSeen(freshMessage)
+
+        let announcePacket = BitchatPacket(
+            type: MessageType.announce.rawValue,
+            senderID: senderData,
+            recipientID: nil,
+            timestamp: staleTimestampMs,
+            payload: Data(),
+            signature: nil,
+            ttl: 1
+        )
+
+        manager.onPublicPacketSeen(announcePacket)
+
+        manager._performMaintenanceSynchronously()
+
+        #expect(manager._hasAnnouncement(for: PeerID(str: peerHex)) == false)
+        #expect(manager._messageCount(for: PeerID(str: peerHex)) == 0)
     }
 }
 

bitchatTests/Integration/IntegrationTests.swift

@@ -6,52 +6,31 @@
 // For more information, see <https://unlicense.org>
 //
 
-import XCTest
+import Foundation
 import CryptoKit
+import Testing
 @testable import bitchat
 
-final class IntegrationTests: XCTestCase {
+struct IntegrationTests {
     
-    var nodes: [String: MockBLEService] = [:]
-    var noiseManagers: [String: NoiseSessionManager] = [:]
-    private var mockKeychain: MockKeychain!
+    private var helper = TestNetworkHelper()
     
-    override func setUp() {
-        super.setUp()
-        // Use the in-memory test bus with autoFlood enabled to simulate
-        // broadcast propagation across a larger mesh. Integration-only.
-        MockBLEService.resetTestBus()
-        MockBLEService.autoFloodEnabled = true
-        mockKeychain = MockKeychain()
-        
-        // Create a network of nodes
-        createNode("Alice", peerID: TestConstants.testPeerID1)
-        createNode("Bob", peerID: TestConstants.testPeerID2)
-        createNode("Charlie", peerID: TestConstants.testPeerID3)
-        createNode("David", peerID: TestConstants.testPeerID4)
-    }
-    
-    override func tearDown() {
-        // Disable flooding to avoid cross-test interference
-        MockBLEService.autoFloodEnabled = false
-        nodes.removeAll()
-        noiseManagers.removeAll()
-        mockKeychain = nil
-        super.tearDown()
+    init() {
+        helper.createNode("Alice", peerID: PeerID(str: UUID().uuidString))
+        helper.createNode("Bob", peerID: PeerID(str: UUID().uuidString))
+        helper.createNode("Charlie", peerID: PeerID(str: UUID().uuidString))
+        helper.createNode("David", peerID: PeerID(str: UUID().uuidString))
     }
     
     // MARK: - Multi-Peer Scenarios
     
-    func testFullMeshCommunication() {
-        // Create full mesh - everyone connected to everyone
-        connectFullMesh()
+    @Test func fullMeshCommunication() async throws {
+        helper.connectFullMesh()
         
-        let expectation = XCTestExpectation(description: "All nodes communicate")
         var messageMatrix: [String: Set<String>] = [:]
+        for (senderName, _) in helper.nodes { messageMatrix[senderName] = [] }
         
-        // Track all receivers; parse sender name from message content "Hello from <Name>"
-        for (senderName, _) in nodes { messageMatrix[senderName] = [] }
-        for (receiverName, receiver) in nodes {
+        for (receiverName, receiver) in helper.nodes {
             receiver.messageDeliveryHandler = { message in
                 let parts = message.content.components(separatedBy: " ")
                 if let last = parts.last, message.content.contains("Hello from") {
@@ -62,108 +41,96 @@ final class IntegrationTests: XCTestCase {
             }
         }
         
-        // Each node sends a message
-        for (name, node) in nodes {
-            node.sendMessage("Hello from \(name)", mentions: [], to: nil)
+        for (name, node) in helper.nodes {
+            node.sendMessage("Hello from \(name)")
         }
         
-        // Wait and verify
-        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
         // Each sender should have reached all other nodes
         for (sender, receivers) in messageMatrix {
-                let expectedReceivers = Set(self.nodes.keys.filter { $0 != sender })
-                XCTAssertEqual(receivers, expectedReceivers, "\(sender) didn't reach all nodes")
+            let expectedReceivers = Set(helper.nodes.keys.filter { $0 != sender })
+            #expect(receivers == expectedReceivers, "\(sender) didn't reach all nodes")
         }
-            expectation.fulfill()
     }
     
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-    }
-    
-    func testDynamicTopologyChanges() {
+    @Test func dynamicTopologyChanges() async throws {
         // Start with Alice -> Bob -> Charlie
-        connect("Alice", "Bob")
-        connect("Bob", "Charlie")
+        helper.connect("Alice", "Bob")
+        helper.connect("Bob", "Charlie")
         
-        let expectation = XCTestExpectation(description: "Topology changes handled")
+        try await confirmation("Topology changes handled") { receiveMessage in
             var phase = 1
             
-        // Phase 1: Test initial topology
-        nodes["Charlie"]!.messageDeliveryHandler = { message in
+            helper.nodes["Charlie"]!.messageDeliveryHandler = { message in
                 if phase == 1 && message.sender == "Alice" {
                     // Now change topology: disconnect Bob, connect Alice-Charlie
-                self.disconnect("Alice", "Bob")
-                self.disconnect("Bob", "Charlie")
-                self.connect("Alice", "Charlie")
+                    helper.disconnect("Alice", "Bob")
+                    helper.disconnect("Bob", "Charlie")
+                    helper.connect("Alice", "Charlie")
                     phase = 2
                     
                     // Send another message
-                self.nodes["Alice"]!.sendMessage("Direct message", mentions: [], to: nil)
+                    helper.nodes["Alice"]!.sendMessage("Direct message")
                 } else if phase == 2 && message.content == "Direct message" {
-                expectation.fulfill()
+                    receiveMessage()
                 }
             }
             
-        // Initial message through relay
             // Allow relay handler to be set before first send
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.05) {
-            self.nodes["Alice"]!.sendMessage("Relayed message", mentions: [], to: nil)
+            try await sleep(0.05)
+            helper.nodes["Alice"]!.sendMessage("Relayed message")
+        }
     }
     
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-    }
-    
-    func testNetworkPartitionRecovery() {
+    @Test func networkPartitionRecovery() async throws {
         // Create two partitions
-        connect("Alice", "Bob")
-        connect("Charlie", "David")
+        helper.connect("Alice", "Bob")
+        helper.connect("Charlie", "David")
         
-        let expectation = XCTestExpectation(description: "Partitions merge and communicate")
         let messagesBeforeMerge = 0
         var messagesAfterMerge = 0
         
+        try await confirmation("Partitions merge and communicate") { receiveMessage in
             // Monitor cross-partition messages
-        nodes["David"]!.messageDeliveryHandler = { message in
+            helper.nodes["David"]!.messageDeliveryHandler = { message in
                 if message.sender == "Alice" {
                     messagesAfterMerge += 1
                     if messagesAfterMerge == 1 {
-                    expectation.fulfill()
+                        receiveMessage()
                     }
                 }
             }
             
             // Try to send across partition (should fail)
-        nodes["Alice"]!.sendMessage("Before merge", mentions: [], to: nil)
+            helper.nodes["Alice"]!.sendMessage("Before merge")
             
             // Merge partitions after delay
-        DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
+            try await sleep(0.05)
             // Connect partitions
-            self.connect("Bob", "Charlie")
+            helper.connect("Bob", "Charlie")
             
             // Enable relay
-            self.setupRelay("Bob", nextHops: ["Charlie"])
-            self.setupRelay("Charlie", nextHops: ["David"])
+            helper.setupRelay("Bob", nextHops: ["Charlie"])
+            helper.setupRelay("Charlie", nextHops: ["David"])
             
             // Send message across merged network
-            self.nodes["Alice"]!.sendMessage("After merge", mentions: [], to: nil)
+            helper.nodes["Alice"]!.sendMessage("After merge")
         }
         
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-        XCTAssertEqual(messagesBeforeMerge, 0)
-        XCTAssertEqual(messagesAfterMerge, 1)
+        #expect(messagesBeforeMerge == 0)
+        #expect(messagesAfterMerge == 1)
     }
     
     // MARK: - Mixed Message Type Scenarios
     
-    func testMixedPublicPrivateMessages() throws {
-        connectFullMesh()
+    @Test func mixedPublicPrivateMessages() async throws {
+        helper.connectFullMesh()
         
-        let expectation = XCTestExpectation(description: "Mixed messages handled correctly")
         var publicCount = 0
         var privateCount = 0
         
+        await confirmation("Mixed messages handled correctly") { completion in
             // Bob monitors messages
-        nodes["Bob"]!.messageDeliveryHandler = { message in
+            helper.nodes["Bob"]!.messageDeliveryHandler = { message in
                 if message.isPrivate && message.recipientNickname == "Bob" {
                     privateCount += 1
                 } else if !message.isPrivate {
@@ -171,261 +138,239 @@ final class IntegrationTests: XCTestCase {
                 }
                 
                 if publicCount == 2 && privateCount == 1 {
-                expectation.fulfill()
+                    completion()
                 }
             }
             
             // Alice sends mixed messages
-        nodes["Alice"]!.sendMessage("Public 1", mentions: [], to: nil)
-        nodes["Alice"]!.sendPrivateMessage("Private to Bob", to: TestConstants.testPeerID2, recipientNickname: "Bob")
-        nodes["Alice"]!.sendMessage("Public 2", mentions: [], to: nil)
-        
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-        XCTAssertEqual(publicCount, 2)
-        XCTAssertEqual(privateCount, 1)
+            helper.nodes["Alice"]!.sendMessage("Public 1")
+            helper.nodes["Alice"]!.sendPrivateMessage("Private to Bob", to: helper.nodes["Bob"]!.peerID, recipientNickname: "Bob")
+            helper.nodes["Alice"]!.sendMessage("Public 2")
         }
         
-    func testEncryptedAndUnencryptedMix() throws {
-        connect("Alice", "Bob")
+        #expect(publicCount == 2)
+        #expect(privateCount == 1)
+    }
+    
+    @Test func encryptedAndUnencryptedMix() async throws {
+        helper.connect("Alice", "Bob")
         
         // Setup Noise session
-        try establishNoiseSession("Alice", "Bob")
+        try helper.establishNoiseSession("Alice", "Bob")
         
-        let expectation = XCTestExpectation(description: "Both encrypted and plain messages work")
         var plainCount = 0
         var encryptedCount = 0
         
-        // Setup handlers
+        try await confirmation("Both encrypted and plain messages work") { completion in
             // Plain path: send public message and count at Bob
-        nodes["Bob"]!.messageDeliveryHandler = { message in
-            if message.content == "Plain message" { plainCount += 1 }
-            if plainCount == 1 && encryptedCount == 1 { expectation.fulfill() }
+            helper.nodes["Bob"]!.messageDeliveryHandler = { message in
+                if message.content == "Plain message" {
+                    plainCount += 1
+                }
+                if plainCount == 1 && encryptedCount == 1 {
+                    completion()
+                }
             }
             
             // Encrypted path: use NoiseSessionManager explicitly
             let plaintext = "Encrypted message".data(using: .utf8)!
-        let ciphertext = try noiseManagers["Alice"]!.encrypt(plaintext, for: TestConstants.testPeerID2)
-        nodes["Bob"]!.packetDeliveryHandler = { packet in
+            let ciphertext = try helper.noiseManagers["Alice"]!.encrypt(plaintext, for: helper.nodes["Bob"]!.peerID)
+            
+            helper.nodes["Bob"]!.packetDeliveryHandler = { packet in
                 if packet.type == MessageType.noiseEncrypted.rawValue {
-                if let data = try? self.noiseManagers["Bob"]!.decrypt(ciphertext, from: TestConstants.testPeerID1),
+                    if let data = try? helper.noiseManagers["Bob"]!.decrypt(ciphertext, from: helper.nodes["Alice"]!.peerID),
                        data == plaintext {
                         encryptedCount = 1
-                    if plainCount == 1 { expectation.fulfill() }
+                        if plainCount == 1 {
+                            completion()
+                        }
                     }
                 }
             }
             
-        nodes["Alice"]!.sendMessage("Plain message", mentions: [], to: nil)
+            helper.nodes["Alice"]!.sendMessage("Plain message")
             // Deliver encrypted packet directly
             let encPacket = TestHelpers.createTestPacket(type: MessageType.noiseEncrypted.rawValue, payload: ciphertext)
-        nodes["Bob"]!.simulateIncomingPacket(encPacket)
-        
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
+            helper.nodes["Bob"]!.simulateIncomingPacket(encPacket)
+        }
     }
     
     // MARK: - Network Resilience Tests
     
-    func testMessageDeliveryUnderChurn() {
+    @Test func messageDeliveryUnderChurn() async throws {
         // Start with stable network
-        connectFullMesh()
+        helper.connectFullMesh()
         
-        let expectation = XCTestExpectation(description: "Messages delivered despite churn")
-        var receivedMessages = Set<String>()
         let totalMessages = 10
         
+        try await confirmation("Messages delivered despite churn", expectedCount: totalMessages) { completion in
             // David tracks received messages
-        nodes["David"]!.messageDeliveryHandler = { message in
-            receivedMessages.insert(message.content)
-            if receivedMessages.count == totalMessages {
-                expectation.fulfill()
-            }
+            helper.nodes["David"]!.messageDeliveryHandler = { message in
+                completion()
             }
             
             // Send messages while churning network
             for i in 0..<totalMessages {
-            nodes["Alice"]!.sendMessage("Message \(i)", mentions: [], to: nil)
+                helper.nodes["Alice"]!.sendMessage("Message \(i)")
                 
                 // Simulate churn
                 if i % 3 == 0 {
                     // Disconnect and reconnect random connection
                     let pairs = [("Alice", "Bob"), ("Bob", "Charlie"), ("Charlie", "David")]
                     let randomPair = pairs.randomElement()!
-                disconnect(randomPair.0, randomPair.1)
-                
-                DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
-                    self.connect(randomPair.0, randomPair.1)
+                    helper.disconnect(randomPair.0, randomPair.1)
+                    try await sleep(0.01)
+                    helper.connect(randomPair.0, randomPair.1)
+                }
             }
         }
     }
     
-        wait(for: [expectation], timeout: TestConstants.longTimeout)
-        XCTAssertEqual(receivedMessages.count, totalMessages)
-    }
+    @Test func peerPresenceTrackingAndReconnection() async throws {
+        helper.connect("Alice", "Bob")
         
-    func testPeerPresenceTrackingAndReconnection() {
-        // Test that after disconnect/reconnect, message delivery resumes
-        connect("Alice", "Bob")
-
-        let expectation = XCTestExpectation(description: "Delivery after reconnection")
-        var delivered = false
-
-        nodes["Bob"]!.messageDeliveryHandler = { message in
-            if message.content == "After reconnect" && !delivered {
-                delivered = true
-                expectation.fulfill()
+        await confirmation("Delivery after reconnection") { delivered in
+            helper.nodes["Bob"]!.messageDeliveryHandler = { message in
+                if message.content == "After reconnect" {
+                    delivered()
                 }
             }
             
             // Simulate disconnect (out of range)
-        disconnect("Alice", "Bob")
+            helper.disconnect("Alice", "Bob")
             // Reconnect
-        connect("Alice", "Bob")
+            helper.connect("Alice", "Bob")
             
             // Send after reconnection
-        nodes["Alice"]!.sendMessage("After reconnect", mentions: [], to: nil)
-
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-        XCTAssertTrue(delivered)
+            helper.nodes["Alice"]!.sendMessage("After reconnect")
+        }
     }
     
-    func testEncryptedMessageAfterPeerRestart() {
-        // Test that encrypted messages work after one peer restarts
-        connect("Alice", "Bob")
+    @Test func encryptedMessageAfterPeerRestart() async throws {
+        helper.connect("Alice", "Bob")
         do {
-            try establishNoiseSession("Alice", "Bob")
+            try helper.establishNoiseSession("Alice", "Bob")
         } catch {
-            XCTFail("Failed to establish Noise session: \(error)")
+            Issue.record("Failed to establish Noise session: \(error)")
         }
         
         // Exchange an encrypted message
-        let firstExpectation = XCTestExpectation(description: "First message received")
-        nodes["Bob"]!.messageDeliveryHandler = { message in
+        await confirmation("First message received") { received in
+            helper.nodes["Bob"]!.messageDeliveryHandler = { message in
                 if message.content == "Before restart" && message.isPrivate {
-                firstExpectation.fulfill()
+                    received()
                 }
             }
-        
-        nodes["Alice"]!.sendPrivateMessage("Before restart", to: TestConstants.testPeerID2, recipientNickname: "Bob")
-        wait(for: [firstExpectation], timeout: TestConstants.defaultTimeout)
+            helper.nodes["Alice"]!.sendPrivateMessage("Before restart", to: helper.nodes["Bob"]!.peerID, recipientNickname: "Bob")
+        }
         
         // Simulate Bob restart by recreating his Noise manager
         let bobKey = Curve25519.KeyAgreement.PrivateKey()
-        noiseManagers["Bob"] = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
+        helper.noiseManagers["Bob"] = NoiseSessionManager(localStaticKey: bobKey, keychain: helper.mockKeychain)
         
         // Re-establish Noise handshake explicitly via managers
         do {
-            let m1 = try noiseManagers["Bob"]!.initiateHandshake(with: TestConstants.testPeerID1)
-            let m2 = try noiseManagers["Alice"]!.handleIncomingHandshake(from: TestConstants.testPeerID2, message: m1)!
-            let m3 = try noiseManagers["Bob"]!.handleIncomingHandshake(from: TestConstants.testPeerID1, message: m2)!
-            _ = try noiseManagers["Alice"]!.handleIncomingHandshake(from: TestConstants.testPeerID2, message: m3)
+            let m1 = try helper.noiseManagers["Bob"]!.initiateHandshake(with: helper.nodes["Alice"]!.peerID)
+            let m2 = try helper.noiseManagers["Alice"]!.handleIncomingHandshake(from: helper.nodes["Bob"]!.peerID, message: m1)!
+            let m3 = try helper.noiseManagers["Bob"]!.handleIncomingHandshake(from: helper.nodes["Alice"]!.peerID, message: m2)!
+            _ = try helper.noiseManagers["Alice"]!.handleIncomingHandshake(from: helper.nodes["Bob"]!.peerID, message: m3)
         } catch {
-            XCTFail("Failed to re-establish Noise session after restart: \(error)")
+            Issue.record("Failed to re-establish Noise session after restart: \(error)")
         }
         
-        // Now messages should work again
-        let secondExpectation = XCTestExpectation(description: "Message after restart received")
-        nodes["Alice"]!.messageDeliveryHandler = { message in
+        // Now messages should work again - simulate encrypted packet
+        await confirmation("Message after restart received") { received in
+            helper.nodes["Alice"]!.messageDeliveryHandler = { message in
                 if message.content == "After restart success" && message.isPrivate {
-                secondExpectation.fulfill()
+                    received()
                 }
             }
             
-        // Simulate encrypted message using managers
             do {
                 let plaintext = "After restart success".data(using: .utf8)!
-            let ciphertext = try noiseManagers["Bob"]!.encrypt(plaintext, for: TestConstants.testPeerID1)
+                let ciphertext = try helper.noiseManagers["Bob"]!.encrypt(plaintext, for: helper.nodes["Alice"]!.peerID)
                 let packet = TestHelpers.createTestPacket(type: MessageType.noiseEncrypted.rawValue, payload: ciphertext)
-            nodes["Alice"]!.packetDeliveryHandler = { pkt in
+                helper.nodes["Alice"]!.packetDeliveryHandler = { pkt in
                     if pkt.type == MessageType.noiseEncrypted.rawValue {
-                    if let data = try? self.noiseManagers["Alice"]!.decrypt(pkt.payload, from: TestConstants.testPeerID2),
+                        if let data = try? helper.noiseManagers["Alice"]!.decrypt(pkt.payload, from: helper.nodes["Bob"]!.peerID),
                            String(data: data, encoding: .utf8) == "After restart success" {
-                        secondExpectation.fulfill()
+                            received()
                         }
                     }
                 }
-            nodes["Alice"]!.simulateIncomingPacket(packet)
+                helper.nodes["Alice"]!.simulateIncomingPacket(packet)
             } catch {
-            XCTFail("Encryption after restart failed: \(error)")
+                Issue.record("Encryption after restart failed: \(error)")
+            }
         }
-        wait(for: [secondExpectation], timeout: TestConstants.defaultTimeout)
     }
     
-    func testLargeScaleNetwork() {
+    @Test func largeScaleNetwork() async throws {
         // Create larger network
         for i in 5...10 {
-            createNode("Node\(i)", peerID: "PEER\(i)")
+            helper.createNode("Node\(i)", peerID: PeerID(str: "PEER\(i)"))
         }
         
         // Connect in ring topology with cross-connections
-        let allNodes = Array(nodes.keys).sorted()
+        let allNodes = Array(helper.nodes.keys).sorted()
         for i in 0..<allNodes.count {
             // Ring connection
-            connect(allNodes[i], allNodes[(i + 1) % allNodes.count])
+            helper.connect(allNodes[i], allNodes[(i + 1) % allNodes.count])
             
             // Cross connection
             if i + 3 < allNodes.count {
-                connect(allNodes[i], allNodes[i + 3])
+                helper.connect(allNodes[i], allNodes[i + 3])
             }
         }
         
-        let expectation = XCTestExpectation(description: "Large network handles broadcast")
-        var nodesReached = Set<String>()
-        
+        await confirmation("Large network handles broadcast", expectedCount: helper.nodes.count - 1) { nodeReaced in
             // All nodes except Alice listen
-        for (name, node) in nodes where name != "Alice" {
+            for (name, node) in helper.nodes where name != "Alice" {
                 node.messageDeliveryHandler = { message in
                     if message.content == "Broadcast test" {
-                    nodesReached.insert(name)
-                    if nodesReached.count == self.nodes.count - 1 {
-                        expectation.fulfill()
-                    }
+                        nodeReaced()
                     }
                 }
             }
             
             // Alice broadcasts
-        nodes["Alice"]!.sendMessage("Broadcast test", mentions: [], to: nil)
-        
-        wait(for: [expectation], timeout: TestConstants.longTimeout)
-        XCTAssertEqual(nodesReached.count, nodes.count - 1)
+            helper.nodes["Alice"]!.sendMessage("Broadcast test")
+        }
     }
     
     // MARK: - Stress Tests
     
-    func testHighLoadScenario() {
-        connectFullMesh()
+    @Test func highLoadScenario() async throws {
+        helper.connectFullMesh()
         
         let messagesPerNode = 25
-        let expectedTotal = messagesPerNode * nodes.count * (nodes.count - 1)
-        var receivedTotal = 0
-        let expectation = XCTestExpectation(description: "High load handled")
+        let expectedTotal = messagesPerNode * helper.nodes.count * (helper.nodes.count - 1)
         
+        await confirmation("High load handled", expectedCount: expectedTotal) { received in
             // Each node tracks messages
-        for (_, node) in nodes {
+            for (_, node) in helper.nodes {
                 node.messageDeliveryHandler = { _ in
-                receivedTotal += 1
-                if receivedTotal >= (expectedTotal - 2) {
-                    expectation.fulfill()
-                }
+                    received()
                 }
             }
             
             // All nodes send many messages simultaneously
-        DispatchQueue.concurrentPerform(iterations: nodes.count) { index in
-            let nodeName = Array(nodes.keys).sorted()[index]
+            await withTaskGroup(of: Void.self) { group in
+                for (name, node) in helper.nodes {
+                    group.addTask {
                         for i in 0..<messagesPerNode {
-                nodes[nodeName]!.sendMessage("\(nodeName) message \(i)", mentions: [], to: nil)
+                            node.sendMessage("\(name) message \(i)")
+                        }
+                    }
+                }
+                await group.waitForAll()
+            }
         }
     }
     
-        wait(for: [expectation], timeout: TestConstants.longTimeout)
-        XCTAssertGreaterThanOrEqual(receivedTotal, expectedTotal - 2)
-    }
+    @Test func mixedTrafficPatterns() async throws {
+        helper.connectFullMesh()
         
-    func testMixedTrafficPatterns() {
-        connectFullMesh()
-        
-        let expectation = XCTestExpectation(description: "Mixed traffic handled")
         var metrics = [
             "public": 0,
             "private": 0,
@@ -434,7 +379,7 @@ final class IntegrationTests: XCTestCase {
         ]
         
         // Setup complex handlers
-        for (name, node) in nodes {
+        for (name, node) in helper.nodes {
             node.messageDeliveryHandler = { message in
                 if message.isPrivate {
                     metrics["private"]! += 1
@@ -453,88 +398,78 @@ final class IntegrationTests: XCTestCase {
         }
         
         // Generate mixed traffic
-        nodes["Alice"]!.sendMessage("Public broadcast", mentions: [], to: nil)
-        nodes["Alice"]!.sendPrivateMessage("Private to Bob", to: TestConstants.testPeerID2, recipientNickname: "Bob")
-        nodes["Bob"]!.sendMessage("Mentioning @Charlie", mentions: ["Charlie"], to: nil)
+        helper.nodes["Alice"]!.sendMessage("Public broadcast")
+        helper.nodes["Alice"]!.sendPrivateMessage("Private to Bob", to: helper.nodes["Bob"]!.peerID, recipientNickname: "Bob")
+        helper.nodes["Bob"]!.sendMessage("Mentioning @Charlie", mentions: ["Charlie"])
         
         // Disconnect to force relay
-        disconnect("Alice", "David")
-        nodes["Alice"]!.sendMessage("Needs relay to David", mentions: [], to: nil)
+        helper.disconnect("Alice", "David")
+        helper.nodes["Alice"]!.sendMessage("Needs relay to David")
         
-        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
-            XCTAssertGreaterThan(metrics["public"]!, 0)
-            XCTAssertGreaterThan(metrics["private"]!, 0)
-            XCTAssertGreaterThan(metrics["mentions"]!, 0)
-            expectation.fulfill()
-        }
-        
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
+        #expect(metrics["public", default: 0] > 0)
+        #expect(metrics["private", default: 0] > 0)
+        #expect(metrics["mentions", default: 0] > 0)
     }
     
     // MARK: - Security Integration Tests
     // Replacement for the legacy NACK test: verifies that after a
     // decryption failure, peers can rehandshake via NoiseSessionManager
     // and resume secure communication.
-    func testRehandshakeAfterDecryptionFailure() throws {
+    @Test func rehandshakeAfterDecryptionFailure() throws {
         // Alice <-> Bob connected
-        connect("Alice", "Bob")
+        helper.connect("Alice", "Bob")
         
         // Establish initial Noise session
-        try establishNoiseSession("Alice", "Bob")
+        try helper.establishNoiseSession("Alice", "Bob")
         
-        guard let aliceManager = noiseManagers["Alice"],
-              let bobManager = noiseManagers["Bob"],
-              let alicePeerID = nodes["Alice"]?.peerID,
-              let bobPeerID = nodes["Bob"]?.peerID else {
-            return XCTFail("Missing managers or peer IDs")
+        guard let aliceManager = helper.noiseManagers["Alice"],
+              let bobManager = helper.noiseManagers["Bob"],
+              let alicePeerID = helper.nodes["Alice"]?.peerID,
+              let bobPeerID = helper.nodes["Bob"]?.peerID
+        else {
+            Issue.record("Missing managers or peer IDs")
+            return
         }
         
         // Baseline: encrypt from Alice, decrypt at Bob
         let plaintext1 = Data("hello-secure".utf8)
         let encrypted1 = try aliceManager.encrypt(plaintext1, for: bobPeerID)
         let decrypted1 = try bobManager.decrypt(encrypted1, from: alicePeerID)
-        XCTAssertEqual(decrypted1, plaintext1)
+        #expect(decrypted1 == plaintext1)
         
         // Simulate decryption failure by corrupting ciphertext
-        var corrupted = encrypted1
-        if !corrupted.isEmpty { corrupted[corrupted.count - 1] ^= 0xFF }
-        do {
+        let corrupted = encrypted1.prefix(15)
+        #expect(throws: NoiseError.invalidCiphertext) {
             _ = try bobManager.decrypt(corrupted, from: alicePeerID)
-            XCTFail("Corrupted ciphertext should not decrypt")
-        } catch {
-            // Expected: treat as session desync and rehandshake
         }
         
         // Bob initiates a new handshake; clear Bob's session first so initiateHandshake won't throw
         bobManager.removeSession(for: alicePeerID)
-        try establishNoiseSession("Bob", "Alice")
+        try helper.establishNoiseSession("Bob", "Alice")
         
         // After rehandshake, encryption/decryption works again
         let plaintext2 = Data("hello-again".utf8)
         let encrypted2 = try aliceManager.encrypt(plaintext2, for: bobPeerID)
         let decrypted2 = try bobManager.decrypt(encrypted2, from: alicePeerID)
-        XCTAssertEqual(decrypted2, plaintext2)
+        #expect(decrypted2 == plaintext2)
     }
     
-    
-    func testEndToEndSecurityScenario() throws {
-        connect("Alice", "Bob")
-        connect("Bob", "Charlie") // Charlie will try to eavesdrop
+    @Test func endToEndSecurityScenario() async throws {
+        helper.connect("Alice", "Bob")
+        helper.connect("Bob", "Charlie") // Charlie will try to eavesdrop
         
         // Establish secure session between Alice and Bob only
-        try establishNoiseSession("Alice", "Bob")
+        try helper.establishNoiseSession("Alice", "Bob")
         
-        let expectation = XCTestExpectation(description: "Secure communication maintained")
-        var bobDecrypted = false
-        var charlieIntercepted = false
+        await confirmation("Secure communication maintained", expectedCount: 2) { receivedPacket in
             
             // Setup encryption at Alice
-        nodes["Alice"]!.packetDeliveryHandler = { packet in
+            helper.nodes["Alice"]!.packetDeliveryHandler = { packet in
                 if packet.type == 0x01,
                    let message = BitchatMessage(packet.payload),
                    message.isPrivate && packet.recipientID != nil {
                     // Encrypt private messages
-                if let encrypted = try? self.noiseManagers["Alice"]!.encrypt(packet.payload, for: TestConstants.testPeerID2) {
+                    if let encrypted = try? helper.noiseManagers["Alice"]!.encrypt(packet.payload, for: helper.nodes["Bob"]!.peerID) {
                         let encPacket = BitchatPacket(
                             type: 0x02,
                             senderID: packet.senderID,
@@ -544,131 +479,38 @@ final class IntegrationTests: XCTestCase {
                             signature: packet.signature,
                             ttl: packet.ttl
                         )
-                    self.nodes["Bob"]!.simulateIncomingPacket(encPacket)
+                        helper.nodes["Bob"]!.simulateIncomingPacket(encPacket)
                     }
                 }
             }
             
             // Bob can decrypt
-        nodes["Bob"]!.packetDeliveryHandler = { packet in
+            helper.nodes["Bob"]!.packetDeliveryHandler = { packet in
                 if packet.type == 0x02 {
-                if let decrypted = try? self.noiseManagers["Bob"]!.decrypt(packet.payload, from: TestConstants.testPeerID1),
-                   let message = BitchatMessage(decrypted) {
-                    bobDecrypted = message.content == "Secret message"
-                    expectation.fulfill()
+                    receivedPacket()
+                    if let decrypted = try? helper.noiseManagers["Bob"]!.decrypt(packet.payload, from: helper.nodes["Alice"]!.peerID) {
+                        #expect(BitchatMessage(decrypted)?.content == "Secret message")
+                    } else {
+                        Issue.record("Bob was unable to decrypt the message")
                     }
                     
                     // Relay encrypted packet to Charlie
-                self.nodes["Charlie"]!.simulateIncomingPacket(packet)
+                    helper.nodes["Charlie"]!.simulateIncomingPacket(packet)
                 }
             }
             
             // Charlie cannot decrypt
-        nodes["Charlie"]!.packetDeliveryHandler = { packet in
+            helper.nodes["Charlie"]!.packetDeliveryHandler = { packet in
                 if packet.type == 0x02 {
-                charlieIntercepted = true
-                // Try to decrypt (should fail)
-                do {
-                    _ = try self.noiseManagers["Charlie"]?.decrypt(packet.payload, from: TestConstants.testPeerID1)
-                    XCTFail("Charlie should not be able to decrypt")
-                } catch {
-                    // Expected
+                    receivedPacket()
+                    #expect(throws: NoiseSessionError.sessionNotFound, "Charlie should not be able to decrypt") {
+                        _ = try helper.noiseManagers["Charlie"]?.decrypt(packet.payload, from: helper.nodes["Alice"]!.peerID)
                     }
                 }
             }
             
             // Send encrypted private message
-        nodes["Alice"]!.sendPrivateMessage("Secret message", to: TestConstants.testPeerID2, recipientNickname: "Bob")
-        
-        wait(for: [expectation], timeout: TestConstants.defaultTimeout)
-        XCTAssertTrue(bobDecrypted)
-        XCTAssertTrue(charlieIntercepted)
-    }
-    
-    // MARK: - Helper Methods
-    
-    private func createNode(_ name: String, peerID: PeerID) {
-        let node = MockBLEService()
-        node.myPeerID = peerID
-        node.mockNickname = name
-        nodes[name] = node
-        
-        // Create Noise manager
-        let key = Curve25519.KeyAgreement.PrivateKey()
-        noiseManagers[name] = NoiseSessionManager(localStaticKey: key, keychain: mockKeychain)
-    }
-    
-    private func connect(_ node1: String, _ node2: String) {
-        guard let n1 = nodes[node1], let n2 = nodes[node2] else { return }
-        n1.simulateConnectedPeer(n2.peerID)
-        n2.simulateConnectedPeer(n1.peerID)
-    }
-    
-    private func disconnect(_ node1: String, _ node2: String) {
-        guard let n1 = nodes[node1], let n2 = nodes[node2] else { return }
-        n1.simulateDisconnectedPeer(n2.peerID)
-        n2.simulateDisconnectedPeer(n1.peerID)
-    }
-    
-    private func connectFullMesh() {
-        let nodeNames = Array(nodes.keys)
-        for i in 0..<nodeNames.count {
-            for j in i+1..<nodeNames.count {
-                connect(nodeNames[i], nodeNames[j])
+            helper.nodes["Alice"]!.sendPrivateMessage("Secret message", to: helper.nodes["Bob"]!.peerID, recipientNickname: "Bob")
         }
     }
 }
-    
-    private func setupRelay(_ nodeName: String, nextHops: [String]) {
-        guard let node = nodes[nodeName] else { return }
-        
-        node.packetDeliveryHandler = { packet in
-            guard packet.ttl > 1 else { return }
-            
-            if let message = BitchatMessage(packet.payload) {
-                guard message.senderPeerID != node.peerID else { return }
-                
-                let relayMessage = BitchatMessage(
-                    id: message.id,
-                    sender: message.sender,
-                    content: message.content,
-                    timestamp: message.timestamp,
-                    isRelay: true,
-                    originalSender: message.isRelay ? message.originalSender : message.sender,
-                    isPrivate: message.isPrivate,
-                    recipientNickname: message.recipientNickname,
-                    senderPeerID: message.senderPeerID,
-                    mentions: message.mentions
-                )
-                
-                if let relayPayload = relayMessage.toBinaryPayload() {
-                    let relayPacket = BitchatPacket(
-                        type: packet.type,
-                        senderID: packet.senderID,
-                        recipientID: packet.recipientID,
-                        timestamp: packet.timestamp,
-                        payload: relayPayload,
-                        signature: packet.signature,
-                        ttl: packet.ttl - 1
-                    )
-                    
-                    for hop in nextHops {
-                        self.nodes[hop]?.simulateIncomingPacket(relayPacket)
-                    }
-                }
-            }
-        }
-    }
-    
-    private func establishNoiseSession(_ node1: String, _ node2: String) throws {
-        guard let manager1 = noiseManagers[node1],
-              let manager2 = noiseManagers[node2],
-              let peer1ID = nodes[node1]?.peerID,
-              let peer2ID = nodes[node2]?.peerID else { return }
-        
-        let msg1 = try manager1.initiateHandshake(with: peer2ID)
-        let msg2 = try manager2.handleIncomingHandshake(from: peer1ID, message: msg1)!
-        let msg3 = try manager1.handleIncomingHandshake(from: peer2ID, message: msg2)!
-        _ = try manager2.handleIncomingHandshake(from: peer1ID, message: msg3)
-    }
-}

bitchatTests/Integration/TestNetworkHelper.swift

@@ -0,0 +1,123 @@
+//
+// TestNetworkHelper.swift
+// bitchatTests
+//
+// Extracted shared, mutable integration state for nodes and noise sessions.
+// Keeps test containers nonmutating (Swift Testing-friendly).
+//
+
+import Foundation
+import CryptoKit
+@testable import bitchat
+
+final class TestNetworkHelper {
+    // Public, read-only views for tests; mutation only through methods
+    var nodes: [String: MockBLEService] = [:]
+    var noiseManagers: [String: NoiseSessionManager] = [:]
+    let mockKeychain = MockKeychain()
+    private let bus = MockBLEBus(autoFloodEnabled: true)
+    
+    // MARK: - Node/Manager management
+    
+    @discardableResult
+    func createNode(_ name: String, peerID: PeerID) -> MockBLEService {
+        let node = MockBLEService(bus: bus)
+        node.myPeerID = peerID
+        node.mockNickname = name
+        nodes[name] = node
+        
+        // Create/replace Noise manager for this node
+        let key = Curve25519.KeyAgreement.PrivateKey()
+        noiseManagers[name] = NoiseSessionManager(localStaticKey: key, keychain: mockKeychain)
+        return node
+    }
+    
+    func getNode(_ name: String) -> MockBLEService? {
+        nodes[name]
+    }
+    
+    func getManager(_ name: String) -> NoiseSessionManager? {
+        noiseManagers[name]
+    }
+    
+    // MARK: - Topology
+    
+    func connect(_ a: String, _ b: String) {
+        guard let n1 = nodes[a], let n2 = nodes[b] else { return }
+        n1.simulateConnectedPeer(n2.peerID)
+        n2.simulateConnectedPeer(n1.peerID)
+    }
+    
+    func disconnect(_ a: String, _ b: String) {
+        guard let n1 = nodes[a], let n2 = nodes[b] else { return }
+        n1.simulateDisconnectedPeer(n2.peerID)
+        n2.simulateDisconnectedPeer(n1.peerID)
+    }
+    
+    func connectFullMesh() {
+        let names = Array(nodes.keys)
+        for i in 0..<names.count {
+            for j in (i+1)..<names.count {
+                connect(names[i], names[j])
+            }
+        }
+    }
+    
+    // MARK: - Relay
+    
+    func setupRelay(_ nodeName: String, nextHops: [String]) {
+        guard let node = nodes[nodeName] else { return }
+        node.packetDeliveryHandler = { [weak self] packet in
+            guard let self else { return }
+            guard packet.ttl > 1 else { return }
+            
+            if let message = BitchatMessage(packet.payload) {
+                guard message.senderPeerID != node.peerID else { return }
+                
+                let relayMessage = BitchatMessage(
+                    id: message.id,
+                    sender: message.sender,
+                    content: message.content,
+                    timestamp: message.timestamp,
+                    isRelay: true,
+                    originalSender: message.isRelay ? message.originalSender : message.sender,
+                    isPrivate: message.isPrivate,
+                    recipientNickname: message.recipientNickname,
+                    senderPeerID: message.senderPeerID,
+                    mentions: message.mentions
+                )
+                
+                if let relayPayload = relayMessage.toBinaryPayload() {
+                    let relayPacket = BitchatPacket(
+                        type: packet.type,
+                        senderID: packet.senderID,
+                        recipientID: packet.recipientID,
+                        timestamp: packet.timestamp,
+                        payload: relayPayload,
+                        signature: packet.signature,
+                        ttl: packet.ttl - 1
+                    )
+                    
+                    for hop in nextHops {
+                        self.nodes[hop]?.simulateIncomingPacket(relayPacket)
+                    }
+                }
+            }
+        }
+    }
+    
+    // MARK: - Noise sessions
+    
+    func establishNoiseSession(_ node1: String, _ node2: String) throws {
+        guard let manager1 = noiseManagers[node1],
+              let manager2 = noiseManagers[node2],
+              let peer1ID = nodes[node1]?.peerID,
+              let peer2ID = nodes[node2]?.peerID else { return }
+        
+        let msg1 = try manager1.initiateHandshake(with: peer2ID)
+        let msg2 = try manager2.handleIncomingHandshake(from: peer1ID, message: msg1)!
+        let msg3 = try manager1.handleIncomingHandshake(from: peer2ID, message: msg2)!
+        _ = try manager2.handleIncomingHandshake(from: peer1ID, message: msg3)
+    }
+}
+

bitchatTests/LocationChannelsTests.swift

@@ -1,8 +1,9 @@
-import XCTest
+import Testing
+import Foundation
 @testable import bitchat
 
-final class LocationChannelsTests: XCTestCase {
-    func testGeohashEncoderPrecisionMapping() {
+struct LocationChannelsTests {
+    @Test func geohashEncoderPrecisionMapping() {
         // Sanity: known coords (Statue of Liberty approx)
         let lat = 40.6892
         let lon = -74.0445
@@ -12,34 +13,35 @@ final class LocationChannelsTests: XCTestCase {
         let region = Geohash.encode(latitude: lat, longitude: lon, precision: GeohashChannelLevel.province.precision)
         let country = Geohash.encode(latitude: lat, longitude: lon, precision: GeohashChannelLevel.region.precision)
         
-        XCTAssertEqual(block.count, 7)
-        XCTAssertEqual(neighborhood.count, 6)
-        XCTAssertEqual(city.count, 5)
-        XCTAssertEqual(region.count, 4)
-        XCTAssertEqual(country.count, 2)
+        #expect(block.count == 7)
+        #expect(neighborhood.count == 6)
+        #expect(city.count == 5)
+        #expect(region.count == 4)
+        #expect(country.count == 2)
         
         // All prefixes must match progressively
-        XCTAssertTrue(block.hasPrefix(neighborhood))
-        XCTAssertTrue(neighborhood.hasPrefix(city))
-        XCTAssertTrue(city.hasPrefix(region))
-        XCTAssertTrue(region.hasPrefix(country))
+        #expect(block.hasPrefix(neighborhood))
+        #expect(neighborhood.hasPrefix(city))
+        #expect(city.hasPrefix(region))
+        #expect(region.hasPrefix(country))
     }
 
-    func testNostrGeohashFilterEncoding() throws {
+    @Test func nostrGeohashFilterEncoding() throws {
         let gh = "u4pruy"
         let filter = NostrFilter.geohashEphemeral(gh)
         let data = try JSONEncoder().encode(filter)
         let json = String(data: data, encoding: .utf8) ?? ""
         // Expect kinds includes 20000 and tag filter '#g':[gh]
-        XCTAssertTrue(json.contains("20000"))
-        XCTAssertTrue(json.contains("\"#g\":[\"\(gh)\"]"))
+        #expect(json.contains("20000"))
+        #expect(json.contains("\"#g\":[\"\(gh)\"]"))
     }
 
-    func testPerGeohashIdentityDeterministic() throws {
+    @Test func perGeohashIdentityDeterministic() throws {
         // Derive twice for same geohash; should be identical
+        let idBridge = NostrIdentityBridge(keychain: MockKeychainHelper())
         let gh = "u4pruy"
-        let id1 = try NostrIdentityBridge.deriveIdentity(forGeohash: gh)
-        let id2 = try NostrIdentityBridge.deriveIdentity(forGeohash: gh)
-        XCTAssertEqual(id1.publicKeyHex, id2.publicKeyHex)
+        let id1 = try idBridge.deriveIdentity(forGeohash: gh)
+        let id2 = try idBridge.deriveIdentity(forGeohash: gh)
+        #expect(id1.publicKeyHex == id2.publicKeyHex)
     }
 }

bitchatTests/LocationNotesManagerTests.swift

@@ -1,8 +1,9 @@
-import XCTest
+import Testing
+import Foundation
 @testable import bitchat
 
 @MainActor
-final class LocationNotesManagerTests: XCTestCase {
+struct LocationNotesManagerTests {
 //    func testSubscribeWithoutRelaysSetsNoRelaysState() {
 //        var subscribeCalled = false
 //        let deps = LocationNotesDependencies(
@@ -47,15 +48,15 @@ final class LocationNotesManagerTests: XCTestCase {
 //        XCTAssertNotEqual(manager.errorMessage, "location_notes.error.no_relays")
 //    }
 
-    func testSubscribeUsesGeoRelaysAndAppendsNotes() {
+    @Test func subscribeUsesGeoRelaysAndAppendsNotes() {
         var relaysCaptured: [String] = []
         var storedHandler: ((NostrEvent) -> Void)?
         var storedEOSE: (() -> Void)?
         let deps = LocationNotesDependencies(
             relayLookup: { _, _ in ["wss://relay.one"] },
             subscribe: { filter, id, relays, handler, eose in
-                XCTAssertEqual(filter.kinds, [1])
-                XCTAssertFalse(id.isEmpty)
+                #expect(filter.kinds == [1])
+                #expect(!id.isEmpty)
                 relaysCaptured = relays
                 storedHandler = handler
                 storedEOSE = eose
@@ -67,8 +68,8 @@ final class LocationNotesManagerTests: XCTestCase {
         )
 
         let manager = LocationNotesManager(geohash: "u4pruydq", dependencies: deps)
-        XCTAssertEqual(relaysCaptured, ["wss://relay.one"])
-        XCTAssertEqual(manager.state, .loading)
+        #expect(relaysCaptured == ["wss://relay.one"])
+        #expect(manager.state == .loading)
 
         var event = NostrEvent(
             pubkey: "pub",
@@ -81,70 +82,12 @@ final class LocationNotesManagerTests: XCTestCase {
         storedHandler?(event)
         storedEOSE?()
 
-        XCTAssertEqual(manager.state, .ready)
-        XCTAssertEqual(manager.notes.count, 1)
-        XCTAssertEqual(manager.notes.first?.content, "hi")
+        #expect(manager.state == .ready)
+        #expect(manager.notes.count == 1)
+        #expect(manager.notes.first?.content == "hi")
     }
 
     private enum TestError: Error {
         case shouldNotDerive
     }
 }
-
-@MainActor
-final class LocationNotesCounterTests: XCTestCase {
-    func testSubscribeWithoutRelaysMarksUnavailable() {
-        var subscribeCalled = false
-        let deps = LocationNotesCounterDependencies(
-            relayLookup: { _, _ in [] },
-            subscribe: { _, _, _, _, _ in subscribeCalled = true },
-            unsubscribe: { _ in }
-        )
-
-        let counter = LocationNotesCounter(testDependencies: deps)
-        counter.subscribe(geohash: "u4pruydq")
-
-        XCTAssertFalse(subscribeCalled)
-        XCTAssertFalse(counter.relayAvailable)
-        XCTAssertTrue(counter.initialLoadComplete)
-        XCTAssertEqual(counter.count, 0)
-    }
-
-    func testSubscribeCountsUniqueNotes() {
-        var storedHandler: ((NostrEvent) -> Void)?
-        var storedEOSE: (() -> Void)?
-        let deps = LocationNotesCounterDependencies(
-            relayLookup: { _, _ in ["wss://relay.geo"] },
-            subscribe: { filter, id, relays, handler, eose in
-                XCTAssertEqual(relays, ["wss://relay.geo"])
-                XCTAssertEqual(filter.kinds, [1])
-                XCTAssertFalse(id.isEmpty)
-                storedHandler = handler
-                storedEOSE = eose
-            },
-            unsubscribe: { _ in }
-        )
-
-        let counter = LocationNotesCounter(testDependencies: deps)
-        counter.subscribe(geohash: "u4pruydq")
-
-        var first = NostrEvent(
-            pubkey: "pub",
-            createdAt: Date(),
-            kind: .textNote,
-            tags: [["g", "u4pruydq"]],
-            content: "a"
-        )
-        first.id = "eventA"
-        storedHandler?(first)
-
-        let duplicate = first
-        storedHandler?(duplicate)
-
-        storedEOSE?()
-
-        XCTAssertTrue(counter.relayAvailable)
-        XCTAssertEqual(counter.count, 1)
-        XCTAssertTrue(counter.initialLoadComplete)
-    }
-}

bitchatTests/Mocks/MockBLEBus.swift

@@ -0,0 +1,57 @@
+//
+// MockBLEBus.swift
+// bitchatTests
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+@testable import bitchat
+
+final class MockBLEBus {
+    private var registry: [PeerID: MockBLEService] = [:]
+    private var adjacency: [PeerID: Set<PeerID>] = [:]
+
+    // Enable automatic flooding for public messages in integration tests only
+    let autoFloodEnabled: Bool
+    
+    init(autoFloodEnabled: Bool = false) {
+        self.autoFloodEnabled = autoFloodEnabled
+    }
+
+    func register(_ service: MockBLEService, for peerID: PeerID) {
+        registry[peerID] = service
+        if adjacency[peerID] == nil { adjacency[peerID] = [] }
+    }
+
+    func connect(_ a: PeerID, _ b: PeerID) {
+        var setA = adjacency[a] ?? []
+        setA.insert(b)
+        adjacency[a] = setA
+        var setB = adjacency[b] ?? []
+        setB.insert(a)
+        adjacency[b] = setB
+    }
+
+    func disconnect(_ a: PeerID, _ b: PeerID) {
+        if var setA = adjacency[a] { setA.remove(b); adjacency[a] = setA }
+        if var setB = adjacency[b] { setB.remove(a); adjacency[b] = setB }
+    }
+
+    func neighbors(of peerID: PeerID) -> [MockBLEService] {
+        let ids = adjacency[peerID] ?? []
+        let result = ids.compactMap { registry[$0] }
+        return result
+    }
+
+    func isDirectNeighbor(_ a: PeerID, _ b: PeerID) -> Bool {
+        let res = adjacency[a]?.contains(b) ?? false
+        return res
+    }
+
+    func service(for peerID: PeerID) -> MockBLEService? {
+        let svc = registry[peerID]
+        return svc
+    }
+}

bitchatTests/Mocks/MockBLEService.swift

@@ -26,13 +26,12 @@ import CoreBluetooth
 ///   simulate broadcast propagation across the mesh. E2E tests keep it off and perform explicit
 ///   relays when needed.
 final class MockBLEService: NSObject {
-    // Enable automatic flooding for public messages in integration tests only
-    static var autoFloodEnabled: Bool = false
+    private let bus: MockBLEBus
     
     // MARK: - Properties matching BLEService
     
     weak var delegate: BitchatDelegate?
-    var myPeerID: PeerID = "MOCK1234"
+    var myPeerID = PeerID(str: "MOCK1234")
     var myNickname: String = "MockUser"
     
     private let mockKeychain = MockKeychain()
@@ -60,8 +59,8 @@ final class MockBLEService: NSObject {
     
     // MARK: - Initialization
     
-    override init() {
-        super.init()
+    init(bus: MockBLEBus) {
+        self.bus = bus
     }
     
     // MARK: - Methods matching BLEService
@@ -71,42 +70,15 @@ final class MockBLEService: NSObject {
     }
     
     // MARK: - In-memory test bus (for E2E/Integration)
-    /// Global per-process bus for deterministic routing in tests.
-    private static var registry: [PeerID: MockBLEService] = [:]
-    private static var adjacency: [PeerID: Set<PeerID>] = [:]
-
-    /// Clears global bus state. Call from test `setUp()`.
-    static func resetTestBus() {
-        registry.removeAll()
-        adjacency.removeAll()
-    }
 
     /// Registers this instance on first use.
     private func registerIfNeeded() {
-        MockBLEService.registry[myPeerID] = self
-        if MockBLEService.adjacency[myPeerID] == nil { MockBLEService.adjacency[myPeerID] = [] }
+        bus.register(self, for: myPeerID)
     }
 
     /// Returns adjacent neighbors based on the current simulated topology.
     private func neighbors() -> [MockBLEService] {
-        guard let ids = MockBLEService.adjacency[myPeerID] else { return [] }
-        return ids.compactMap { MockBLEService.registry[$0] }
-    }
-
-    /// Adds an undirected edge between two peerIDs.
-    private static func connectPeers(_ a: PeerID, _ b: PeerID) {
-        var setA = adjacency[a] ?? []
-        setA.insert(b)
-        adjacency[a] = setA
-        var setB = adjacency[b] ?? []
-        setB.insert(a)
-        adjacency[b] = setB
-    }
-
-    /// Removes an undirected edge between two peerIDs.
-    private static func disconnectPeers(_ a: PeerID, _ b: PeerID) {
-        if var setA = adjacency[a] { setA.remove(b); adjacency[a] = setA }
-        if var setB = adjacency[b] { setB.remove(a); adjacency[b] = setB }
+        bus.neighbors(of: myPeerID)
     }
 
     func startServices() {
@@ -173,7 +145,7 @@ final class MockBLEService: NSObject {
             // Surface raw packet to tests that intercept/relay/encrypt
             packetDeliveryHandler?(packet)
 
-            // Deliver public messages to adjacent peers via test bus
+            // Deliver public messages to adjacent peers via bus
             if recipientID == nil {
                 for neighbor in neighbors() {
                     neighbor.simulateIncomingPacket(packet)
@@ -182,6 +154,14 @@ final class MockBLEService: NSObject {
         }
     }
 
+    func sendFileBroadcast(_ packet: BitchatFilePacket, transferId: String) {
+        // Tests currently ignore file transfer flows; keep stub for protocol conformance.
+    }
+
+    func sendFilePrivate(_ packet: BitchatFilePacket, to peerID: PeerID, transferId: String) {
+        // Tests currently ignore file transfer flows; keep stub for protocol conformance.
+    }
+
     func sendPrivateMessage(_ content: String, to recipientPeerID: PeerID, recipientNickname: String, messageID: String) {
         let message = BitchatMessage(
             id: messageID,
@@ -219,24 +199,20 @@ final class MockBLEService: NSObject {
             packetDeliveryHandler?(packet)
 
             // If directly connected to recipient, deliver only to them.
-            if let neighbors = MockBLEService.adjacency[myPeerID], neighbors.contains(recipientPeerID),
-               let target = MockBLEService.registry[recipientPeerID] {
+            if bus.isDirectNeighbor(myPeerID, recipientPeerID),
+               let target = bus.service(for: recipientPeerID) {
                 target.simulateIncomingPacket(packet)
             } else {
                 // Not directly connected: deliver to neighbors for relay; also deliver directly if target is known
-                if let target = MockBLEService.registry[recipientPeerID] {
+                if let target = bus.service(for: recipientPeerID) {
                     target.simulateIncomingPacket(packet)
                 }
-                if let neighbors = MockBLEService.adjacency[myPeerID] {
-                    for peer in neighbors where peer != recipientPeerID {
-                        if let neighbor = MockBLEService.registry[peer] {
+                for neighbor in neighbors() where neighbor.peerID != recipientPeerID {
                     neighbor.simulateIncomingPacket(packet)
                 }
             }
         }
     }
-        }
-    }
     
     func sendFavoriteNotification(to peerID: String, isFavorite: Bool) {
         // Mock implementation
@@ -279,14 +255,14 @@ final class MockBLEService: NSObject {
     
     func simulateConnectedPeer(_ peerID: PeerID) {
         registerIfNeeded()
-        MockBLEService.connectPeers(myPeerID, peerID)
+        bus.connect(myPeerID, peerID)
         connectedPeers.insert(peerID)
         delegate?.didConnectToPeer(peerID)
         delegate?.didUpdatePeerList(Array(connectedPeers))
     }
     
     func simulateDisconnectedPeer(_ peerID: PeerID) {
-        MockBLEService.disconnectPeers(myPeerID, peerID)
+        bus.disconnect(myPeerID, peerID)
         connectedPeers.remove(peerID)
         delegate?.didDisconnectFromPeer(peerID)
         delegate?.didUpdatePeerList(Array(connectedPeers))
@@ -319,7 +295,7 @@ final class MockBLEService: NSObject {
                 // When enabled, propagate a public broadcast across the entire connected
                 // component regardless of the original TTL to better emulate large-network
                 // broadcast expectations. De-duplication via seenMessageIDs prevents loops.
-                if MockBLEService.autoFloodEnabled,
+                if bus.autoFloodEnabled,
                    packet.recipientID == nil,
                    !message.isPrivate {
                     let nextTTL = packet.ttl > 0 ? packet.ttl - 1 : 0
@@ -353,8 +329,8 @@ typealias MockSimplifiedBluetoothService = MockBLEService
 // MARK: - Helpers
 
 extension MockBLEService {
-    convenience init(peerID: PeerID, nickname: String) {
-        self.init()
+    convenience init(peerID: PeerID, nickname: String, bus: MockBLEBus) {
+        self.init(bus: bus)
         myPeerID = peerID
         mockNickname = nickname
     }

bitchatTests/Mocks/MockKeychain.swift

@@ -44,3 +44,21 @@ final class MockKeychain: KeychainManagerProtocol {
         storage["identity_noiseStaticKey"] != nil
     }
 }
+
+final class MockKeychainHelper: KeychainHelperProtocol {
+    private typealias Service = String
+    private typealias Key = String
+    private var storage: [Service: [Key: Data]] = [:]
+    
+    func save(key: String, data: Data, service: String, accessible: CFString?) {
+        storage[service]?[key] = data
+    }
+    
+    func load(key: String, service: String) -> Data? {
+        storage[service]?[key]
+    }
+    
+    func delete(key: String, service: String) {
+        storage[service]?.removeValue(forKey: key)
+    }
+}

bitchatTests/Noise/NoiseProtocolTests.swift

@@ -6,135 +6,123 @@
 // For more information, see <https://unlicense.org>
 //
 
-import XCTest
+import Testing
 import CryptoKit
+import Foundation
 @testable import bitchat
 
-final class NoiseProtocolTests: XCTestCase {
+struct NoiseProtocolTests {
     
-    var aliceKey: Curve25519.KeyAgreement.PrivateKey!
-    var bobKey: Curve25519.KeyAgreement.PrivateKey!
-    var aliceSession: NoiseSession!
-    var bobSession: NoiseSession!
-    private var mockKeychain: MockKeychain!
+    private let aliceKey = Curve25519.KeyAgreement.PrivateKey()
+    private let bobKey = Curve25519.KeyAgreement.PrivateKey()
+    private let mockKeychain = MockKeychain()
     
-    override func setUp() {
-        super.setUp()
-        aliceKey = Curve25519.KeyAgreement.PrivateKey()
-        bobKey = Curve25519.KeyAgreement.PrivateKey()
-        mockKeychain = MockKeychain()
-    }
+    private let alicePeerID = PeerID(str: UUID().uuidString)
+    private let bobPeerID = PeerID(str: UUID().uuidString)
     
-    override func tearDown() {
-        aliceSession = nil
-        bobSession = nil
-        mockKeychain = nil
-        super.tearDown()
-    }
+    private let aliceSession: NoiseSession
+    private let bobSession: NoiseSession
     
-    // MARK: - Basic Handshake Tests
-    
-    func testXXPatternHandshake() throws {
-        // Create sessions
+    init() {
         aliceSession = NoiseSession(
-            peerID: TestConstants.testPeerID2,
+            peerID: alicePeerID,
             role: .initiator,
             keychain: mockKeychain,
             localStaticKey: aliceKey
         )
         
         bobSession = NoiseSession(
-            peerID: TestConstants.testPeerID1,
+            peerID: bobPeerID,
             role: .responder,
             keychain: mockKeychain,
             localStaticKey: bobKey
         )
+    }
     
+    // MARK: - Basic Handshake Tests
+    
+    @Test func xxPatternHandshake() throws {
         // Alice starts handshake (message 1)
         let message1 = try aliceSession.startHandshake()
-        XCTAssertFalse(message1.isEmpty)
-        XCTAssertEqual(aliceSession.getState(), .handshaking)
+        #expect(!message1.isEmpty)
+        #expect(aliceSession.getState() == .handshaking)
         
         // Bob processes message 1 and creates message 2
         let message2 = try bobSession.processHandshakeMessage(message1)
-        XCTAssertNotNil(message2)
-        XCTAssertFalse(message2!.isEmpty)
-        XCTAssertEqual(bobSession.getState(), .handshaking)
+        #expect(message2 != nil)
+        #expect(!message2!.isEmpty)
+        #expect(bobSession.getState() == .handshaking)
         
         // Alice processes message 2 and creates message 3
         let message3 = try aliceSession.processHandshakeMessage(message2!)
-        XCTAssertNotNil(message3)
-        XCTAssertFalse(message3!.isEmpty)
-        XCTAssertEqual(aliceSession.getState(), .established)
+        #expect(message3 != nil)
+        #expect(!message3!.isEmpty)
+        #expect(aliceSession.getState() == .established)
         
         // Bob processes message 3 and completes handshake
         let finalMessage = try bobSession.processHandshakeMessage(message3!)
-        XCTAssertNil(finalMessage) // No more messages needed
-        XCTAssertEqual(bobSession.getState(), .established)
+        #expect(finalMessage == nil) // No more messages needed
+        #expect(bobSession.getState() == .established)
         
         // Verify both sessions are established
-        XCTAssertTrue(aliceSession.isEstablished())
-        XCTAssertTrue(bobSession.isEstablished())
+        #expect(aliceSession.isEstablished())
+        #expect(bobSession.isEstablished())
         
         // Verify they have each other's static keys
-        XCTAssertEqual(aliceSession.getRemoteStaticPublicKey()?.rawRepresentation, bobKey.publicKey.rawRepresentation)
-        XCTAssertEqual(bobSession.getRemoteStaticPublicKey()?.rawRepresentation, aliceKey.publicKey.rawRepresentation)
+        #expect(aliceSession.getRemoteStaticPublicKey()?.rawRepresentation == bobKey.publicKey.rawRepresentation)
+        #expect(bobSession.getRemoteStaticPublicKey()?.rawRepresentation == aliceKey.publicKey.rawRepresentation)
     }
     
-    func testHandshakeStateValidation() throws {
-        aliceSession = NoiseSession(
-            peerID: TestConstants.testPeerID2,
-            role: .initiator,
-            keychain: mockKeychain,
-            localStaticKey: aliceKey
-        )
-        
+    @Test func handshakeStateValidation() throws {
         // Cannot process message before starting handshake
-        XCTAssertThrowsError(try aliceSession.processHandshakeMessage(Data()))
+        #expect(throws: NoiseSessionError.invalidState) {
+            try aliceSession.processHandshakeMessage(Data())
+        }
         
         // Start handshake
         _ = try aliceSession.startHandshake()
         
         // Cannot start handshake twice
-        XCTAssertThrowsError(try aliceSession.startHandshake())
+        #expect(throws: NoiseSessionError.invalidState) {
+            try aliceSession.startHandshake()
+        }
     }
     
     // MARK: - Encryption/Decryption Tests
     
-    func testBasicEncryptionDecryption() throws {
-        // Establish sessions
-        try establishSessions()
+    @Test func basicEncryptionDecryption() throws {
+        try performHandshake(initiator: aliceSession, responder: bobSession)
         
         let plaintext = "Hello, Bob!".data(using: .utf8)!
         
         // Alice encrypts
         let ciphertext = try aliceSession.encrypt(plaintext)
-        XCTAssertNotEqual(ciphertext, plaintext)
-        XCTAssertGreaterThan(ciphertext.count, plaintext.count) // Should have overhead
+        #expect(ciphertext != plaintext)
+        #expect(ciphertext.count > plaintext.count) // Should have overhead
         
         // Bob decrypts
         let decrypted = try bobSession.decrypt(ciphertext)
-        XCTAssertEqual(decrypted, plaintext)
+        #expect(decrypted == plaintext)
     }
     
-    func testBidirectionalEncryption() throws {
-        try establishSessions()
+    @Test func bidirectionalEncryption() throws {
+        try performHandshake(initiator: aliceSession, responder: bobSession)
         
         // Alice -> Bob
         let aliceMessage = "Hello from Alice".data(using: .utf8)!
         let aliceCiphertext = try aliceSession.encrypt(aliceMessage)
         let bobReceived = try bobSession.decrypt(aliceCiphertext)
-        XCTAssertEqual(bobReceived, aliceMessage)
+        #expect(bobReceived == aliceMessage)
         
         // Bob -> Alice
         let bobMessage = "Hello from Bob".data(using: .utf8)!
         let bobCiphertext = try bobSession.encrypt(bobMessage)
         let aliceReceived = try aliceSession.decrypt(bobCiphertext)
-        XCTAssertEqual(aliceReceived, bobMessage)
+        #expect(aliceReceived == bobMessage)
     }
     
-    func testLargeMessageEncryption() throws {
-        try establishSessions()
+    @Test func largeMessageEncryption() throws {
+        try performHandshake(initiator: aliceSession, responder: bobSession)
         
         // Create a large message
         let largeMessage = TestHelpers.generateRandomData(length: 100_000)
@@ -143,81 +131,78 @@ final class NoiseProtocolTests: XCTestCase {
         let ciphertext = try aliceSession.encrypt(largeMessage)
         let decrypted = try bobSession.decrypt(ciphertext)
         
-        XCTAssertEqual(decrypted, largeMessage)
+        #expect(decrypted == largeMessage)
     }
     
-    func testEncryptionBeforeHandshake() {
-        aliceSession = NoiseSession(
-            peerID: TestConstants.testPeerID2,
-            role: .initiator,
-            keychain: mockKeychain,
-            localStaticKey: aliceKey
-        )
-        
+    @Test func encryptionBeforeHandshake() {
         let plaintext = "test".data(using: .utf8)!
         
-        // Should throw when not established
-        XCTAssertThrowsError(try aliceSession.encrypt(plaintext))
-        XCTAssertThrowsError(try aliceSession.decrypt(plaintext))
+        #expect(throws: NoiseSessionError.notEstablished) {
+            try aliceSession.encrypt(plaintext)
+        }
+        
+        #expect(throws: NoiseSessionError.notEstablished) {
+            try aliceSession.decrypt(plaintext)
+        }
     }
     
     // MARK: - Session Manager Tests
     
-    func testSessionManagerBasicOperations() throws {
+    @Test func sessionManagerBasicOperations() throws {
         let manager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
 
-        // Create session
-        let session = manager.createSession(for: TestConstants.testPeerID2, role: .initiator)
-        XCTAssertNotNil(session)
+        #expect(manager.getSession(for: alicePeerID) == nil)
+
+        _ = try manager.initiateHandshake(with: alicePeerID)
+        #expect(manager.getSession(for: alicePeerID) != nil)
 
         // Get session
-        let retrieved = manager.getSession(for: TestConstants.testPeerID2)
-        XCTAssertNotNil(retrieved)
-        XCTAssertTrue(session === retrieved)
+        let retrieved = manager.getSession(for: alicePeerID)
+        #expect(retrieved != nil)
 
         // Remove session
-        manager.removeSession(for: TestConstants.testPeerID2)
-        XCTAssertNil(manager.getSession(for: TestConstants.testPeerID2))
+        manager.removeSession(for: alicePeerID)
+        #expect(manager.getSession(for: alicePeerID) == nil)
     }
     
-    func testSessionManagerHandshakeInitiation() throws {
+    @Test func sessionManagerHandshakeInitiation() throws {
         let manager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         
         // Initiate handshake
-        let handshakeData = try manager.initiateHandshake(with: TestConstants.testPeerID2)
-        XCTAssertFalse(handshakeData.isEmpty)
+        let handshakeData = try manager.initiateHandshake(with: alicePeerID)
+        #expect(!handshakeData.isEmpty)
         
         // Session should exist
-        let session = manager.getSession(for: TestConstants.testPeerID2)
-        XCTAssertNotNil(session)
-        XCTAssertEqual(session?.getState(), .handshaking)
+        let session = manager.getSession(for: alicePeerID)
+        #expect(session != nil)
+        #expect(session?.getState() == .handshaking)
     }
     
-    func testSessionManagerIncomingHandshake() throws {
+    @Test func sessionManagerIncomingHandshake() throws {
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
         
         // Alice initiates
-        let message1 = try aliceManager.initiateHandshake(with: TestConstants.testPeerID2)
+        let message1 = try aliceManager.initiateHandshake(with: alicePeerID)
         
         // Bob responds
-        let message2 = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: message1)
-        XCTAssertNotNil(message2)
+        let message2 = try bobManager.handleIncomingHandshake(from: bobPeerID, message: message1)
+        #expect(message2 != nil)
         
         // Continue handshake
-        let message3 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: message2!)
-        XCTAssertNotNil(message3)
+        let message3 = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: message2!)
+        #expect(message3 != nil)
         
         // Complete handshake
-        let finalMessage = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: message3!)
-        XCTAssertNil(finalMessage)
+        let finalMessage = try bobManager.handleIncomingHandshake(from: bobPeerID, message: message3!)
+        #expect(finalMessage == nil)
         
         // Both should have established sessions
-        XCTAssertTrue(aliceManager.getSession(for: TestConstants.testPeerID2)?.isEstablished() ?? false)
-        XCTAssertTrue(bobManager.getSession(for: TestConstants.testPeerID1)?.isEstablished() ?? false)
+        #expect(aliceManager.getSession(for: alicePeerID)?.isEstablished() == true)
+        #expect(bobManager.getSession(for: bobPeerID)?.isEstablished() == true)
     }
     
-    func testSessionManagerEncryptionDecryption() throws {
+    @Test func sessionManagerEncryptionDecryption() throws {
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
         
@@ -226,17 +211,17 @@ final class NoiseProtocolTests: XCTestCase {
         
         // Encrypt with manager
         let plaintext = "Test message".data(using: .utf8)!
-        let ciphertext = try aliceManager.encrypt(plaintext, for: TestConstants.testPeerID2)
+        let ciphertext = try aliceManager.encrypt(plaintext, for: alicePeerID)
         
         // Decrypt with manager
-        let decrypted = try bobManager.decrypt(ciphertext, from: TestConstants.testPeerID1)
-        XCTAssertEqual(decrypted, plaintext)
+        let decrypted = try bobManager.decrypt(ciphertext, from: bobPeerID)
+        #expect(decrypted == plaintext)
     }
     
     // MARK: - Security Tests
     
-    func testTamperedCiphertextDetection() throws {
-        try establishSessions()
+    @Test func tamperedCiphertextDetection() throws {
+        try performHandshake(initiator: aliceSession, responder: bobSession)
         
         let plaintext = "Secret message".data(using: .utf8)!
         var ciphertext = try aliceSession.encrypt(plaintext)
@@ -245,11 +230,19 @@ final class NoiseProtocolTests: XCTestCase {
         ciphertext[ciphertext.count / 2] ^= 0xFF
         
         // Decryption should fail
-        XCTAssertThrowsError(try bobSession.decrypt(ciphertext))
+        if #available(macOS 14.4, iOS 17.4, *) {
+            #expect(throws: CryptoKitError.authenticationFailure) {
+                try bobSession.decrypt(ciphertext)
+            }
+        } else {
+            #expect(throws: (any Error).self) {
+                try bobSession.decrypt(ciphertext)
+            }
+        }
     }
     
-    func testReplayPrevention() throws {
-        try establishSessions()
+    @Test func replayPrevention() throws {
+        try performHandshake(initiator: aliceSession, responder: bobSession)
         
         let plaintext = "Test message".data(using: .utf8)!
         let ciphertext = try aliceSession.encrypt(plaintext)
@@ -258,16 +251,18 @@ final class NoiseProtocolTests: XCTestCase {
         _ = try bobSession.decrypt(ciphertext)
         
         // Replaying the same ciphertext should fail
-        XCTAssertThrowsError(try bobSession.decrypt(ciphertext))
+        #expect(throws: NoiseError.replayDetected) {
+            try bobSession.decrypt(ciphertext)
+        }
     }
     
-    func testSessionIsolation() throws {
+    @Test func sessionIsolation() throws {
         // Create two separate session pairs
-        let aliceSession1 = NoiseSession(peerID: "peer1", role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
-        let bobSession1 = NoiseSession(peerID: "alice1", role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
+        let aliceSession1 = NoiseSession(peerID: PeerID(str: "peer1"), role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
+        let bobSession1 = NoiseSession(peerID: PeerID(str: "alice1"), role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
         
-        let aliceSession2 = NoiseSession(peerID: "peer2", role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
-        let bobSession2 = NoiseSession(peerID: "alice2", role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
+        let aliceSession2 = NoiseSession(peerID: PeerID(str: "peer2"), role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
+        let bobSession2 = NoiseSession(peerID: PeerID(str: "alice2"), role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
         
         // Establish both pairs
         try performHandshake(initiator: aliceSession1, responder: bobSession1)
@@ -278,16 +273,24 @@ final class NoiseProtocolTests: XCTestCase {
         let ciphertext1 = try aliceSession1.encrypt(plaintext)
         
         // Should not be able to decrypt with session 2
-        XCTAssertThrowsError(try bobSession2.decrypt(ciphertext1))
+        if #available(macOS 14.4, iOS 17.4, *) {
+            #expect(throws: CryptoKitError.authenticationFailure) {
+                try bobSession2.decrypt(ciphertext1)
+            }
+        } else {
+            #expect(throws: (any Error).self) {
+                try bobSession2.decrypt(ciphertext1)
+            }
+        }
         
         // But should work with correct session
         let decrypted = try bobSession1.decrypt(ciphertext1)
-        XCTAssertEqual(decrypted, plaintext)
+        #expect(decrypted == plaintext)
     }
     
     // MARK: - Session Recovery Tests
     
-    func testPeerRestartDetection() throws {
+    @Test func peerRestartDetection() throws {
         // Establish initial sessions
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -295,38 +298,38 @@ final class NoiseProtocolTests: XCTestCase {
         try establishManagerSessions(aliceManager: aliceManager, bobManager: bobManager)
         
         // Exchange some messages to establish nonce state
-        let message1 = try aliceManager.encrypt("Hello".data(using: .utf8)!, for: TestConstants.testPeerID2)
-        _ = try bobManager.decrypt(message1, from: TestConstants.testPeerID1)
+        let message1 = try aliceManager.encrypt("Hello".data(using: .utf8)!, for: alicePeerID)
+        _ = try bobManager.decrypt(message1, from: bobPeerID)
         
-        let message2 = try bobManager.encrypt("World".data(using: .utf8)!, for: TestConstants.testPeerID1)
-        _ = try aliceManager.decrypt(message2, from: TestConstants.testPeerID2)
+        let message2 = try bobManager.encrypt("World".data(using: .utf8)!, for: bobPeerID)
+        _ = try aliceManager.decrypt(message2, from: alicePeerID)
         
         // Simulate Bob restart by creating new manager with same key
         let bobManagerRestarted = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
         
         // Bob initiates new handshake after restart
-        let newHandshake1 = try bobManagerRestarted.initiateHandshake(with: TestConstants.testPeerID1)
+        let newHandshake1 = try bobManagerRestarted.initiateHandshake(with: bobPeerID)
         
         // Alice should accept the new handshake (clearing old session)
-        let newHandshake2 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: newHandshake1)
-        XCTAssertNotNil(newHandshake2)
+        let newHandshake2 = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: newHandshake1)
+        #expect(newHandshake2 != nil)
         
         // Complete the new handshake
-        let newHandshake3 = try bobManagerRestarted.handleIncomingHandshake(from: TestConstants.testPeerID1, message: newHandshake2!)
-        XCTAssertNotNil(newHandshake3)
-        _ = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: newHandshake3!)
+        let newHandshake3 = try bobManagerRestarted.handleIncomingHandshake(from: bobPeerID, message: newHandshake2!)
+        #expect(newHandshake3 != nil)
+        _ = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: newHandshake3!)
         
         // Should be able to exchange messages with new sessions
         let testMessage = "After restart".data(using: .utf8)!
-        let encrypted = try bobManagerRestarted.encrypt(testMessage, for: TestConstants.testPeerID1)
-        let decrypted = try aliceManager.decrypt(encrypted, from: TestConstants.testPeerID2)
-        XCTAssertEqual(decrypted, testMessage)
+        let encrypted = try bobManagerRestarted.encrypt(testMessage, for: bobPeerID)
+        let decrypted = try aliceManager.decrypt(encrypted, from: alicePeerID)
+        #expect(decrypted == testMessage)
     }
     
-    func testNonceDesynchronizationRecovery() throws {
+    @Test func nonceDesynchronizationRecovery() throws {
         // Create two sessions
-        aliceSession = NoiseSession(peerID: TestConstants.testPeerID2, role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
-        bobSession = NoiseSession(peerID: TestConstants.testPeerID1, role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
+        let aliceSession = NoiseSession(peerID: alicePeerID, role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
+        let bobSession = NoiseSession(peerID: bobPeerID, role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
         
         // Establish sessions
         try performHandshake(initiator: aliceSession, responder: bobSession)
@@ -344,10 +347,12 @@ final class NoiseProtocolTests: XCTestCase {
         
         // With per-packet nonce carried, decryption should not throw here
         let desyncMessage = try aliceSession.encrypt("This now succeeds".data(using: .utf8)!)
-        XCTAssertNoThrow(try bobSession.decrypt(desyncMessage))
+        #expect(throws: Never.self) {
+            try bobSession.decrypt(desyncMessage)
+        }
     }
     
-    func testConcurrentEncryption() throws {
+    @Test func concurrentEncryption() async throws {
         // Test thread safety of encryption operations
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -355,14 +360,13 @@ final class NoiseProtocolTests: XCTestCase {
         try establishManagerSessions(aliceManager: aliceManager, bobManager: bobManager)
         
         let messageCount = 100
-        let expectation = XCTestExpectation(description: "All messages encrypted and decrypted")
-        expectation.expectedFulfillmentCount = messageCount
         
+        try await confirmation("All messages encrypted and decrypted", expectedCount: messageCount) { completion in
             var encryptedMessages: [Int: Data] = [:]
             // Encrypt messages sequentially to avoid nonce races in manager
             for i in 0..<messageCount {
                 let plaintext = "Concurrent message \(i)".data(using: .utf8)!
-            let encrypted = try aliceManager.encrypt(plaintext, for: TestConstants.testPeerID2)
+                let encrypted = try aliceManager.encrypt(plaintext, for: alicePeerID)
                 encryptedMessages[i] = encrypted
             }
             
@@ -370,22 +374,21 @@ final class NoiseProtocolTests: XCTestCase {
             for i in 0..<messageCount {
                 do {
                     guard let encrypted = encryptedMessages[i] else {
-                    XCTFail("Missing encrypted message \(i)")
+                        Issue.record("Missing encrypted message \(i)")
                         return
                     }
-                let decrypted = try bobManager.decrypt(encrypted, from: TestConstants.testPeerID1)
+                    let decrypted = try bobManager.decrypt(encrypted, from: bobPeerID)
                     let expected = "Concurrent message \(i)".data(using: .utf8)!
-                XCTAssertEqual(decrypted, expected)
-                expectation.fulfill()
+                    #expect(decrypted == expected)
+                    completion()
                 } catch {
-                XCTFail("Decryption failed for message \(i): \(error)")
+                    Issue.record("Decryption failed for message \(i): \(error)")
+                }
+            }
         }
     }
     
-        wait(for: [expectation], timeout: 10.0)
-    }
-    
-    func testSessionStaleDetection() throws {
+    @Test func sessionStaleDetection() throws {
         // Test that sessions are properly marked as stale
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -396,10 +399,10 @@ final class NoiseProtocolTests: XCTestCase {
         let sessions = aliceManager.getSessionsNeedingRekey()
         
         // New session should not need rekey
-        XCTAssertTrue(sessions.isEmpty || sessions.allSatisfy { !$0.needsRekey })
+        #expect(sessions.isEmpty || sessions.allSatisfy { !$0.needsRekey })
     }
     
-    func testHandshakeAfterDecryptionFailure() throws {
+    @Test func handshakeAfterDecryptionFailure() throws {
         // Test that handshake is properly initiated after decryption failure
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -408,17 +411,25 @@ final class NoiseProtocolTests: XCTestCase {
         try establishManagerSessions(aliceManager: aliceManager, bobManager: bobManager)
         
         // Create a corrupted message
-        var encrypted = try aliceManager.encrypt("Test".data(using: .utf8)!, for: TestConstants.testPeerID2)
+        var encrypted = try aliceManager.encrypt("Test".data(using: .utf8)!, for: alicePeerID)
         encrypted[10] ^= 0xFF // Corrupt the data
         
         // Decryption should fail
-        XCTAssertThrowsError(try bobManager.decrypt(encrypted, from: TestConstants.testPeerID1))
-        
-        // Bob should still have the session (it's not removed on single failure)
-        XCTAssertNotNil(bobManager.getSession(for: TestConstants.testPeerID1))
+        if #available(macOS 14.4, iOS 17.4, *) {
+            #expect(throws: CryptoKitError.authenticationFailure) {
+                try bobManager.decrypt(encrypted, from: bobPeerID)
+            }
+        } else {
+            #expect(throws: (any Error).self) {
+                try bobManager.decrypt(encrypted, from: bobPeerID)
+            }
         }
         
-    func testHandshakeAlwaysAcceptedWithExistingSession() throws {
+        // Bob should still have the session (it's not removed on single failure)
+        #expect(bobManager.getSession(for: bobPeerID) != nil)
+    }
+    
+    @Test func handshakeAlwaysAcceptedWithExistingSession() throws {
         // Test that handshake is always accepted even with existing valid session
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -427,38 +438,38 @@ final class NoiseProtocolTests: XCTestCase {
         try establishManagerSessions(aliceManager: aliceManager, bobManager: bobManager)
         
         // Verify sessions are established
-        XCTAssertTrue(aliceManager.getSession(for: TestConstants.testPeerID2)?.isEstablished() ?? false)
-        XCTAssertTrue(bobManager.getSession(for: TestConstants.testPeerID1)?.isEstablished() ?? false)
+        #expect(aliceManager.getSession(for: alicePeerID)?.isEstablished() == true)
+        #expect(bobManager.getSession(for: bobPeerID)?.isEstablished() == true)
         
         // Exchange messages to verify sessions work
         let testMessage = "Session works".data(using: .utf8)!
-        let encrypted = try aliceManager.encrypt(testMessage, for: TestConstants.testPeerID2)
-        let decrypted = try bobManager.decrypt(encrypted, from: TestConstants.testPeerID1)
-        XCTAssertEqual(decrypted, testMessage)
+        let encrypted = try aliceManager.encrypt(testMessage, for: alicePeerID)
+        let decrypted = try bobManager.decrypt(encrypted, from: bobPeerID)
+        #expect(decrypted == testMessage)
         
         // Alice clears her session (simulating decryption failure)
-        aliceManager.removeSession(for: TestConstants.testPeerID2)
+        aliceManager.removeSession(for: alicePeerID)
         
         // Alice initiates new handshake despite Bob having valid session
-        let newHandshake1 = try aliceManager.initiateHandshake(with: TestConstants.testPeerID2)
+        let newHandshake1 = try aliceManager.initiateHandshake(with: alicePeerID)
         
         // Bob should accept the new handshake even though he has a valid session
-        let newHandshake2 = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: newHandshake1)
-        XCTAssertNotNil(newHandshake2, "Bob should accept handshake despite having valid session")
+        let newHandshake2 = try bobManager.handleIncomingHandshake(from: bobPeerID, message: newHandshake1)
+        #expect(newHandshake2 != nil, "Bob should accept handshake despite having valid session")
         
         // Complete the handshake
-        let newHandshake3 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: newHandshake2!)
-        XCTAssertNotNil(newHandshake3)
-        _ = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: newHandshake3!)
+        let newHandshake3 = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: newHandshake2!)
+        #expect(newHandshake3 != nil)
+        _ = try bobManager.handleIncomingHandshake(from: bobPeerID, message: newHandshake3!)
         
         // Verify new sessions work
         let testMessage2 = "New session works".data(using: .utf8)!
-        let encrypted2 = try aliceManager.encrypt(testMessage2, for: TestConstants.testPeerID2)
-        let decrypted2 = try bobManager.decrypt(encrypted2, from: TestConstants.testPeerID1)
-        XCTAssertEqual(decrypted2, testMessage2)
+        let encrypted2 = try aliceManager.encrypt(testMessage2, for: alicePeerID)
+        let decrypted2 = try bobManager.decrypt(encrypted2, from: bobPeerID)
+        #expect(decrypted2 == testMessage2)
     }
     
-    func testNonceDesynchronizationCausesRehandshake() throws {
+    @Test func nonceDesynchronizationCausesRehandshake() throws {
         // Test that nonce desynchronization leads to proper re-handshake
         let aliceManager = NoiseSessionManager(localStaticKey: aliceKey, keychain: mockKeychain)
         let bobManager = NoiseSessionManager(localStaticKey: bobKey, keychain: mockKeychain)
@@ -468,89 +479,43 @@ final class NoiseProtocolTests: XCTestCase {
         
         // Exchange messages normally
         for i in 0..<5 {
-            let msg = try aliceManager.encrypt("Message \(i)".data(using: .utf8)!, for: TestConstants.testPeerID2)
-            _ = try bobManager.decrypt(msg, from: TestConstants.testPeerID1)
+            let msg = try aliceManager.encrypt("Message \(i)".data(using: .utf8)!, for: alicePeerID)
+            _ = try bobManager.decrypt(msg, from: bobPeerID)
         }
         
         // Simulate desynchronization - Alice sends messages that Bob doesn't receive
         for i in 0..<3 {
-            _ = try aliceManager.encrypt("Lost message \(i)".data(using: .utf8)!, for: TestConstants.testPeerID2)
+            _ = try aliceManager.encrypt("Lost message \(i)".data(using: .utf8)!, for: alicePeerID)
         }
         
         // With nonce carried in packet, decryption should not throw here
-        let desyncMessage = try aliceManager.encrypt("This now succeeds".data(using: .utf8)!, for: TestConstants.testPeerID2)
-        XCTAssertNoThrow(try bobManager.decrypt(desyncMessage, from: TestConstants.testPeerID1))
+        let desyncMessage = try aliceManager.encrypt("This now succeeds".data(using: .utf8)!, for: alicePeerID)
+        #expect(throws: Never.self) {
+            try bobManager.decrypt(desyncMessage, from: bobPeerID)
+        }
         
         // Bob clears session and initiates new handshake
-        bobManager.removeSession(for: TestConstants.testPeerID1)
-        let rehandshake1 = try bobManager.initiateHandshake(with: TestConstants.testPeerID1)
+        bobManager.removeSession(for: bobPeerID)
+        let rehandshake1 = try bobManager.initiateHandshake(with: bobPeerID)
         
         // Alice should accept despite having a "valid" (but desynced) session
-        let rehandshake2 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: rehandshake1)
-        XCTAssertNotNil(rehandshake2, "Alice should accept handshake to fix desync")
+        let rehandshake2 = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: rehandshake1)
+        #expect(rehandshake2 != nil, "Alice should accept handshake to fix desync")
         
         // Complete handshake
-        let rehandshake3 = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: rehandshake2!)
-        XCTAssertNotNil(rehandshake3)
-        _ = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: rehandshake3!)
+        let rehandshake3 = try bobManager.handleIncomingHandshake(from: bobPeerID, message: rehandshake2!)
+        #expect(rehandshake3 != nil)
+        _ = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: rehandshake3!)
         
         // Verify communication works again
         let testResynced = "Resynced".data(using: .utf8)!
-        let encryptedResync = try aliceManager.encrypt(testResynced, for: TestConstants.testPeerID2)
-        let decryptedResync = try bobManager.decrypt(encryptedResync, from: TestConstants.testPeerID1)
-        XCTAssertEqual(decryptedResync, testResynced)
-    }
-    
-    // MARK: - Performance Tests
-    
-    func testHandshakePerformance() throws {
-        measure {
-            do {
-                let alice = NoiseSession(peerID: "bob", role: .initiator, keychain: mockKeychain, localStaticKey: aliceKey)
-                let bob = NoiseSession(peerID: "alice", role: .responder, keychain: mockKeychain, localStaticKey: bobKey)
-                try performHandshake(initiator: alice, responder: bob)
-            } catch {
-                XCTFail("Handshake failed: \(error)")
-            }
-        }
-    }
-    
-    func testEncryptionPerformance() throws {
-        try establishSessions()
-        let message = TestHelpers.generateRandomData(length: 1024)
-        
-        measure {
-            do {
-                for _ in 0..<100 {
-                    let ciphertext = try aliceSession.encrypt(message)
-                    _ = try bobSession.decrypt(ciphertext)
-                }
-            } catch {
-                XCTFail("Encryption/decryption failed: \(error)")
-            }
-        }
+        let encryptedResync = try aliceManager.encrypt(testResynced, for: alicePeerID)
+        let decryptedResync = try bobManager.decrypt(encryptedResync, from: bobPeerID)
+        #expect(decryptedResync == testResynced)
     }
     
     // MARK: - Helper Methods
     
-    private func establishSessions() throws {
-        aliceSession = NoiseSession(
-            peerID: TestConstants.testPeerID2,
-            role: .initiator,
-            keychain: mockKeychain,
-            localStaticKey: aliceKey
-        )
-        
-        bobSession = NoiseSession(
-            peerID: TestConstants.testPeerID1,
-            role: .responder,
-            keychain: mockKeychain,
-            localStaticKey: bobKey
-        )
-        
-        try performHandshake(initiator: aliceSession, responder: bobSession)
-    }
-    
     private func performHandshake(initiator: NoiseSession, responder: NoiseSession) throws {
         let msg1 = try initiator.startHandshake()
         let msg2 = try responder.processHandshakeMessage(msg1)!
@@ -559,9 +524,9 @@ final class NoiseProtocolTests: XCTestCase {
     }
     
     private func establishManagerSessions(aliceManager: NoiseSessionManager, bobManager: NoiseSessionManager) throws {
-        let msg1 = try aliceManager.initiateHandshake(with: TestConstants.testPeerID2)
-        let msg2 = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: msg1)!
-        let msg3 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: msg2)!
-        _ = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: msg3)
+        let msg1 = try aliceManager.initiateHandshake(with: alicePeerID)
+        let msg2 = try bobManager.handleIncomingHandshake(from: bobPeerID, message: msg1)!
+        let msg3 = try aliceManager.handleIncomingHandshake(from: alicePeerID, message: msg2)!
+        _ = try bobManager.handleIncomingHandshake(from: bobPeerID, message: msg3)
     }
 }

bitchatTests/NostrProtocolTests.swift

@@ -5,20 +5,20 @@
 // Tests for NIP-17 gift-wrapped private messages
 //
 
-import XCTest
+import Testing
+import CryptoKit
+import Foundation
 @testable import bitchat
 
-final class NostrProtocolTests: XCTestCase {
+struct NostrProtocolTests {
     
-    func testNIP17MessageRoundTrip() throws {
+    @Test func nip17MessageRoundTrip() throws {
         // Create sender and recipient identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
         
-        #if DEBUG
         print("Sender pubkey: \(sender.publicKeyHex)")
         print("Recipient pubkey: \(recipient.publicKeyHex)")
-        #endif
         
         // Create a test message
         let originalContent = "Hello from NIP-17 test!"
@@ -30,10 +30,8 @@ final class NostrProtocolTests: XCTestCase {
             senderIdentity: sender
         )
         
-        #if DEBUG
         print("Gift wrap created with ID: \(giftWrap.id)")
         print("Gift wrap pubkey: \(giftWrap.pubkey)")
-        #endif
         
         // Decrypt the gift wrap
         let (decryptedContent, senderPubkey, timestamp) = try NostrProtocol.decryptPrivateMessage(
@@ -42,20 +40,18 @@ final class NostrProtocolTests: XCTestCase {
         )
         
         // Verify
-        XCTAssertEqual(decryptedContent, originalContent)
-        XCTAssertEqual(senderPubkey, sender.publicKeyHex)
+        #expect(decryptedContent == originalContent)
+        #expect(senderPubkey == sender.publicKeyHex)
         
         // Verify timestamp is reasonable (within last minute)
         let messageDate = Date(timeIntervalSince1970: TimeInterval(timestamp))
         let timeDiff = abs(messageDate.timeIntervalSinceNow)
-        XCTAssertLessThan(timeDiff, 60, "Message timestamp should be recent")
+        #expect(timeDiff < 60, "Message timestamp should be recent")
         
-        #if DEBUG
         print("✅ Successfully decrypted message: '\(decryptedContent)' from \(senderPubkey) at \(messageDate)")
-        #endif
     }
     
-    func testGiftWrapUsesUniqueEphemeralKeys() throws {
+    @Test func giftWrapUsesUniqueEphemeralKeys() throws {
         // Create identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
@@ -74,11 +70,10 @@ final class NostrProtocolTests: XCTestCase {
         )
         
         // Gift wrap pubkeys should be different (unique ephemeral keys)
-        XCTAssertNotEqual(message1.pubkey, message2.pubkey)
-        #if DEBUG
+        #expect(message1.pubkey != message2.pubkey)
+        
         print("Message 1 gift wrap pubkey: \(message1.pubkey)")
         print("Message 2 gift wrap pubkey: \(message2.pubkey)")
-        #endif
         
         // Both should decrypt successfully
         let (content1, _, _) = try NostrProtocol.decryptPrivateMessage(
@@ -90,11 +85,11 @@ final class NostrProtocolTests: XCTestCase {
             recipientIdentity: recipient
         )
         
-        XCTAssertEqual(content1, "Message 1")
-        XCTAssertEqual(content2, "Message 2")
+        #expect(content1 == "Message 1")
+        #expect(content2 == "Message 2")
     }
     
-    func testDecryptionFailsWithWrongRecipient() throws {
+    @Test func decryptionFailsWithWrongRecipient() throws {
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
         let wrongRecipient = try NostrIdentity.generate()
@@ -107,13 +102,20 @@ final class NostrProtocolTests: XCTestCase {
         )
         
         // Try to decrypt with wrong recipient
-        XCTAssertThrowsError(try NostrProtocol.decryptPrivateMessage(
+        if #available(macOS 14.4, iOS 17.4, *) {
+            #expect(throws: CryptoKitError.authenticationFailure) {
+                try NostrProtocol.decryptPrivateMessage(
                     giftWrap: giftWrap,
                     recipientIdentity: wrongRecipient
-        )) { error in
-            #if DEBUG
-            print("Expected error when decrypting with wrong key: \(error)")
-            #endif
+                )
+            }
+        } else {
+            #expect(throws: (any Error).self) {
+                try NostrProtocol.decryptPrivateMessage(
+                    giftWrap: giftWrap,
+                    recipientIdentity: wrongRecipient
+                )
+            }
         }
     }
 
@@ -124,11 +126,12 @@ final class NostrProtocolTests: XCTestCase {
 
         // Build a DELIVERED ack embedded payload (geohash-style, no recipient peer ID)
         let messageID = "TEST-MSG-DELIVERED-1"
-        let senderPeerID = "0123456789abcdef" // 8-byte hex peer ID
-        guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .delivered, messageID: messageID, senderPeerID: senderPeerID) else {
-            XCTFail("Failed to embed delivered ack")
-            return
-        }
+        let senderPeerID = PeerID(str: "0123456789abcdef") // 8-byte hex peer ID
+
+        let embedded = try #require(
+            NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .delivered, messageID: messageID, senderPeerID: senderPeerID),
+            "Failed to embed delivered ack"
+        )
 
         // Create NIP-17 gift wrap to recipient (uses NIP-44 v2 internally)
         let giftWrap = try NostrProtocol.createPrivateMessage(
@@ -138,7 +141,7 @@ final class NostrProtocolTests: XCTestCase {
         )
 
         // Ensure v2 format was used for ciphertext
-        XCTAssertTrue(giftWrap.content.hasPrefix("v2:"))
+        #expect(giftWrap.content.hasPrefix("v2:"))
 
         // Decrypt as recipient
         let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateMessage(
@@ -147,39 +150,37 @@ final class NostrProtocolTests: XCTestCase {
         )
 
         // Verify sender is correct
-        XCTAssertEqual(senderPubkey, sender.publicKeyHex)
+        #expect(senderPubkey == sender.publicKeyHex)
 
         // Parse BitChat payload
-        XCTAssertTrue(content.hasPrefix("bitchat1:"))
+        #expect(content.hasPrefix("bitchat1:"))
         let base64url = String(content.dropFirst("bitchat1:".count))
-        guard let packetData = Self.base64URLDecode(base64url),
-              let packet = BitchatPacket.from(packetData) else {
-            return XCTFail("Failed to decode bitchat packet")
-        }
-        XCTAssertEqual(packet.type, MessageType.noiseEncrypted.rawValue)
-        guard let payload = NoisePayload.decode(packet.payload) else {
-            return XCTFail("Failed to decode NoisePayload")
-        }
+        let packetData = try #require(Self.base64URLDecode(base64url))
+        let packet = try #require(BitchatPacket.from(packetData), "Failed to decode bitchat packet")
+        
+        #expect(packet.type == MessageType.noiseEncrypted.rawValue)
+        let payload = try #require(NoisePayload.decode(packet.payload), "Failed to decode NoisePayload")
+        
         switch payload.type {
         case .delivered:
             let mid = String(data: payload.data, encoding: .utf8)
-            XCTAssertEqual(mid, messageID)
+            #expect(mid == messageID)
         default:
-            XCTFail("Unexpected payload type: \(payload.type)")
+            Issue.record("Unexpected payload type: \(payload.type)")
         }
     }
 
-    func testAckRoundTripNIP44V2_ReadReceipt() throws {
+    @Test func ackRoundTripNIP44V2_ReadReceipt() throws {
         // Identities
         let sender = try NostrIdentity.generate()
         let recipient = try NostrIdentity.generate()
         
         let messageID = "TEST-MSG-READ-1"
-        let senderPeerID = "fedcba9876543210" // 8-byte hex peer ID
-        guard let embedded = NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .readReceipt, messageID: messageID, senderPeerID: senderPeerID) else {
-            XCTFail("Failed to embed read ack")
-            return
-        }
+        let senderPeerID = PeerID(str: "fedcba9876543210") // 8-byte hex peer ID
+        let embedded = try #require(
+            NostrEmbeddedBitChat.encodeAckForNostrNoRecipient(type: .readReceipt, messageID: messageID, senderPeerID: senderPeerID),
+            "Failed to embed read ack"
+        )
 
         let giftWrap = try NostrProtocol.createPrivateMessage(
             content: embedded,
@@ -187,30 +188,28 @@ final class NostrProtocolTests: XCTestCase {
             senderIdentity: sender
         )
 
-        XCTAssertTrue(giftWrap.content.hasPrefix("v2:"))
+        #expect(giftWrap.content.hasPrefix("v2:"))
 
         let (content, senderPubkey, _) = try NostrProtocol.decryptPrivateMessage(
             giftWrap: giftWrap,
             recipientIdentity: recipient
         )
-        XCTAssertEqual(senderPubkey, sender.publicKeyHex)
+        #expect(senderPubkey == sender.publicKeyHex)
 
-        XCTAssertTrue(content.hasPrefix("bitchat1:"))
+        #expect(content.hasPrefix("bitchat1:"))
         let base64url = String(content.dropFirst("bitchat1:".count))
-        guard let packetData = Self.base64URLDecode(base64url),
-              let packet = BitchatPacket.from(packetData) else {
-            return XCTFail("Failed to decode bitchat packet")
-        }
-        XCTAssertEqual(packet.type, MessageType.noiseEncrypted.rawValue)
-        guard let payload = NoisePayload.decode(packet.payload) else {
-            return XCTFail("Failed to decode NoisePayload")
-        }
+        let packetData = try #require(Self.base64URLDecode(base64url))
+        let packet = try #require(BitchatPacket.from(packetData), "Failed to decode bitchat packet")
+        
+        #expect(packet.type == MessageType.noiseEncrypted.rawValue)
+        let payload = try #require(NoisePayload.decode(packet.payload), "Failed to decode NoisePayload")
+        
         switch payload.type {
         case .readReceipt:
             let mid = String(data: payload.data, encoding: .utf8)
-            XCTAssertEqual(mid, messageID)
+            #expect(mid == messageID)
         default:
-            XCTFail("Unexpected payload type: \(payload.type)")
+            Issue.record("Unexpected payload type: \(payload.type)")
         }
     }
 

bitchatTests/NotificationStreamAssemblerTests.swift

@@ -1,7 +1,8 @@
-import XCTest
+import Testing
+import Foundation
 @testable import bitchat
 
-final class NotificationStreamAssemblerTests: XCTestCase {
+struct NotificationStreamAssemblerTests {
     private func makePacket(timestamp: UInt64 = 0x0102030405) -> BitchatPacket {
         let sender = Data([0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77])
         return BitchatPacket(
@@ -15,60 +16,51 @@ final class NotificationStreamAssemblerTests: XCTestCase {
         )
     }
 
-    func testAssemblesSingleFrameAcrossChunks() {
+    @Test func assemblesSingleFrameAcrossChunks() throws {
         var assembler = NotificationStreamAssembler()
         let packet = makePacket()
-        guard let frame = packet.toBinaryData(padding: false) else {
-            return XCTFail("Failed to encode packet")
-        }
-        XCTAssertNotNil(BinaryProtocol.decode(frame))
+        let frame = try #require(packet.toBinaryData(padding: false), "Failed to encode packet")
+
+        #expect(BinaryProtocol.decode(frame) != nil)
         let payloadLen = (Int(frame[12]) << 8) | Int(frame[13])
-        XCTAssertEqual(payloadLen, packet.payload.count)
+        #expect(payloadLen == packet.payload.count)
 
         let splitIndex = min(20, max(1, frame.count / 2))
         let first = frame.prefix(splitIndex)
         let second = frame.suffix(from: splitIndex)
-        XCTAssertEqual(first.count + second.count, frame.count)
+        #expect(first.count + second.count == frame.count)
 
         var result = assembler.append(first)
-        XCTAssertTrue(result.frames.isEmpty)
-        XCTAssertTrue(result.droppedPrefixes.isEmpty)
-        XCTAssertFalse(result.reset)
+        #expect(result.frames.isEmpty)
+        #expect(result.droppedPrefixes.isEmpty)
+        #expect(!result.reset)
 
         result = assembler.append(second)
-        XCTAssertEqual(result.frames.count, 1)
-        XCTAssertTrue(result.droppedPrefixes.isEmpty)
-        XCTAssertFalse(result.reset)
+        #expect(result.frames.count == 1)
+        #expect(result.droppedPrefixes.isEmpty)
+        #expect(!result.reset)
 
-        guard let frameData = result.frames.first else {
-            return XCTFail("Missing frame data")
-        }
-        if frameData.count != frame.count {
-            XCTFail("Frame size mismatch: expected \(frame.count) got \(frameData.count)\nframe=\(Array(frame))\nassembled=\(Array(frameData))")
-            return
-        }
-        guard let decoded = BinaryProtocol.decode(frameData) else {
-            return XCTFail("Failed to decode frame")
-        }
-        XCTAssertEqual(decoded.type, packet.type)
-        XCTAssertEqual(decoded.payload, packet.payload)
-        XCTAssertEqual(decoded.senderID, packet.senderID)
-        XCTAssertEqual(decoded.timestamp, packet.timestamp)
+        let frameData = try #require(result.frames.first, "Missing frame data")
+        #expect(frameData.count == frame.count)
+        
+        let decoded = try #require(BinaryProtocol.decode(frameData), "Failed to decode frame")
+        #expect(decoded.type == packet.type)
+        #expect(decoded.payload == packet.payload)
+        #expect(decoded.senderID == packet.senderID)
+        #expect(decoded.timestamp == packet.timestamp)
 
         var directAssembler = NotificationStreamAssembler()
         let directResult = directAssembler.append(frame)
-        XCTAssertEqual(directResult.frames.first?.count, frame.count)
+        #expect(directResult.frames.first?.count == frame.count)
     }
 
-    func testAssemblesMultipleFramesSequentially() {
+    @Test func assemblesMultipleFramesSequentially() throws {
         var assembler = NotificationStreamAssembler()
         let packet1 = makePacket(timestamp: 0xABC)
         let packet2 = makePacket(timestamp: 0xDEF)
 
-        guard let frame1 = packet1.toBinaryData(padding: false),
-              let frame2 = packet2.toBinaryData(padding: false) else {
-            return XCTFail("Failed to encode packets")
-        }
+        let frame1 = try #require(packet1.toBinaryData(padding: false), "Failed to encode packet")
+        let frame2 = try #require(packet2.toBinaryData(padding: false), "Failed to encode packet")
 
         var combined = Data()
         combined.append(frame1)
@@ -77,35 +69,83 @@ final class NotificationStreamAssemblerTests: XCTestCase {
         let secondChunk = combined.suffix(from: 20)
 
         var result = assembler.append(firstChunk)
-        XCTAssertTrue(result.frames.isEmpty)
+        #expect(result.frames.isEmpty)
 
         result = assembler.append(secondChunk)
-        XCTAssertEqual(result.frames.count, 2)
-        guard let decoded1 = BinaryProtocol.decode(result.frames[0]),
-              let decoded2 = BinaryProtocol.decode(result.frames[1]) else {
-            return XCTFail("Failed to decode frames")
-        }
-        XCTAssertEqual(decoded1.timestamp, packet1.timestamp)
-        XCTAssertEqual(decoded2.timestamp, packet2.timestamp)
+        #expect(result.frames.count == 2)
+        
+        let decoded1 = try #require(BinaryProtocol.decode(result.frames[0]), "Failed to decode frame")
+        let decoded2 = try #require(BinaryProtocol.decode(result.frames[1]), "Failed to decode frame")
+        #expect(decoded1.timestamp == packet1.timestamp)
+        #expect(decoded2.timestamp == packet2.timestamp)
     }
 
-    func testDropsInvalidPrefixByte() {
+    @Test func dropsInvalidPrefixByte() throws {
         var assembler = NotificationStreamAssembler()
         let packet = makePacket(timestamp: 0xF00)
-        guard let frame = packet.toBinaryData(padding: false) else {
-            return XCTFail("Failed to encode packet")
-        }
+        let frame = try #require(packet.toBinaryData(padding: false), "Failed to encode packet")
         var noisyFrame = Data([0x00])
         noisyFrame.append(frame)
 
         let result = assembler.append(noisyFrame)
-        XCTAssertEqual(result.droppedPrefixes, [0x00])
-        XCTAssertEqual(result.frames.count, 1)
-        XCTAssertFalse(result.reset)
+        #expect(result.droppedPrefixes == [0x00])
+        #expect(result.frames.count == 1)
+        #expect(result.reset == false)
 
-        guard let decoded = BinaryProtocol.decode(result.frames[0]) else {
-            return XCTFail("Failed to decode frame after drop")
+        let decoded = try #require(BinaryProtocol.decode(result.frames[0]), "Failed to decode frame after drop")
+        #expect(decoded.timestamp == packet.timestamp)
     }
-        XCTAssertEqual(decoded.timestamp, packet.timestamp)
+
+    func testAssemblesCompressedLargeFrame() throws {
+        var assembler = NotificationStreamAssembler()
+
+        // Keep the fixture below FileTransferLimits.maxPayloadBytes so encoding succeeds while still exercising compression.
+        let largeContent = Data(repeating: 0x41, count: 600_000)
+        let filePacket = BitchatFilePacket(
+            fileName: "large.bin",
+            fileSize: UInt64(largeContent.count),
+            mimeType: "application/octet-stream",
+            content: largeContent
+        )
+        let tlvPayload = try #require(filePacket.encode(), "Failed to encode file packet")
+
+        let senderID = Data(repeating: 0xAA, count: BinaryProtocol.senderIDSize)
+        let packet = BitchatPacket(
+            type: MessageType.fileTransfer.rawValue,
+            senderID: senderID,
+            recipientID: nil,
+            timestamp: 0x010203040506,
+            payload: tlvPayload,
+            signature: nil,
+            ttl: 3,
+            version: 2
+        )
+
+        let frame = try #require(packet.toBinaryData(padding: false), "Failed to encode packet frame")
+
+        #expect(BinaryProtocol.Offsets.flags < frame.count)
+        let flags = frame[frame.startIndex + BinaryProtocol.Offsets.flags]
+        #expect((flags & BinaryProtocol.Flags.isCompressed) != 0, "Frame should be compressed for large payloads")
+
+        let splitIndex = min(4096, frame.count / 2)
+        var result = assembler.append(frame.prefix(splitIndex))
+        #expect(result.frames.isEmpty)
+
+        result = assembler.append(frame.suffix(from: splitIndex))
+        #expect(result.frames.count == 1)
+        #expect(result.droppedPrefixes.isEmpty)
+        #expect(result.reset == false)
+
+        let assembled = try #require(result.frames.first, "Missing assembled frame")
+        #expect(assembled.count == frame.count)
+
+        let decodedPacket = try #require(BinaryProtocol.decode(assembled), "Failed to decode compressed frame")
+        #expect(decodedPacket.payload.count == tlvPayload.count)
+
+        let decodedFile = try #require(BitchatFilePacket.decode(decodedPacket.payload), "Failed to decode TLV payload")
+        #expect(decodedFile.fileName == filePacket.fileName)
+        #expect(decodedFile.mimeType == filePacket.mimeType)
+        #expect(decodedFile.content.count == largeContent.count)
+        #expect(decodedFile.content.prefix(32) == largeContent.prefix(32))
     }
 }

bitchatTests/Protocol/BinaryProtocolPaddingTests.swift

@@ -5,30 +5,29 @@
 // This is free and unencumbered software released into the public domain.
 //
 
-import XCTest
+import Testing
 @testable import bitchat
 
-final class BinaryProtocolPaddingTests: XCTestCase {
-    func test_padded_vs_unpadded_length() throws {
+struct BinaryProtocolPaddingTests {
+    @Test func padded_vs_unpadded_length() throws {
         // Use helper to create a small test packet
         let packet = TestHelpers.createTestPacket()
-        guard let padded = BinaryProtocol.encode(packet, padding: true) else { return XCTFail("encode padded") }
-        guard let unpadded = BinaryProtocol.encode(packet, padding: false) else { return XCTFail("encode unpadded") }
-        XCTAssertGreaterThanOrEqual(padded.count, unpadded.count, "Padded frame should be >= unpadded")
+        let padded = try #require(BinaryProtocol.encode(packet, padding: true), "encode padded")
+        let unpadded = try #require(BinaryProtocol.encode(packet, padding: false), "encode unpadded")
+        #expect(padded.count >= unpadded.count, "Padded frame should be >= unpadded")
     }
 
-    func test_decode_padded_and_unpadded_round_trip() throws {
+    @Test func decode_padded_and_unpadded_round_trip() throws {
         let packet = TestHelpers.createTestPacket()
-        // Padded
-        guard let padded = BinaryProtocol.encode(packet, padding: true) else { return XCTFail("encode padded") }
-        guard let dec1 = BinaryProtocol.decode(padded) else { return XCTFail("decode padded") }
-        XCTAssertEqual(dec1.type, packet.type)
-        XCTAssertEqual(dec1.payload, packet.payload)
-        // Unpadded
-        guard let unpadded = BinaryProtocol.encode(packet, padding: false) else { return XCTFail("encode unpadded") }
-        guard let dec2 = BinaryProtocol.decode(unpadded) else { return XCTFail("decode unpadded") }
-        XCTAssertEqual(dec2.type, packet.type)
-        XCTAssertEqual(dec2.payload, packet.payload)
-    }
-}
 
+        let padded = try #require(BinaryProtocol.encode(packet, padding: true), "encode padded")
+        let dec1 = try #require(BinaryProtocol.decode(padded), "decode padded")
+        #expect(dec1.type == packet.type)
+        #expect(dec1.payload == packet.payload)
+
+        let unpadded = try #require(BinaryProtocol.encode(packet, padding: false), "encode unpadded")
+        let dec2 = try #require(BinaryProtocol.decode(unpadded), "decode unpadded")
+        #expect(dec2.type == packet.type)
+        #expect(dec2.payload == packet.payload)
+    }
+}