Fix duplicate messages after channel switch\n\n- Dedup on per-geohash append (skip if ID exists)\n- Dedup and sort timeline by timestamp when switching into a geohash\n- Keep content/layout unchanged; add lightweight debug logs for empty rows

- Use NSString.length for all NSRange regex scans
- Guard string slicing when lastEnd > match.lowerBound
- Advance lastEnd safely to avoid backtracking overlaps
- Apply to formatMessageContent, formatMessage, formatMessageAsText, parseMentions

bitchat.xcodeproj/project.pbxproj

@@ -32,6 +32,10 @@
 		048A4BE72E5CCCC300162C4A /* TransportConfig.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4BE62E5CCCC300162C4A /* TransportConfig.swift */; };
 		048A4BE82E5CCCC300162C4A /* TransportConfig.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4BE62E5CCCC300162C4A /* TransportConfig.swift */; };
 		048A4BE92E5CCCC300162C4B /* TransportConfig.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4BE62E5CCCC300162C4A /* TransportConfig.swift */; };
+		048A4C282E5FCD6600162C4A /* GeohashBookmarksStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4C272E5FCD6600162C4A /* GeohashBookmarksStore.swift */; };
+		048A4C292E5FCD6600162C4A /* GeohashBookmarksStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4C272E5FCD6600162C4A /* GeohashBookmarksStore.swift */; };
+		048A4C2B2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4C2A2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift */; };
+		048A4C2C2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 048A4C2A2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift */; };
 		049BD3902E4EC4F0001A566B /* PrivateChatManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38F2E4EC4F0001A566B /* PrivateChatManager.swift */; };
 		049BD3912E4EC4F0001A566B /* AutocompleteService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38C2E4EC4F0001A566B /* AutocompleteService.swift */; };
 		049BD3922E4EC4F0001A566B /* CommandProcessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38D2E4EC4F0001A566B /* CommandProcessor.swift */; };
@@ -56,12 +60,6 @@
 		049BD3B32E51F319001A566B /* MessageRouter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD3B02E51F319001A566B /* MessageRouter.swift */; };
 		049BD3B42E51F319001A566B /* NostrTransport.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD3B12E51F319001A566B /* NostrTransport.swift */; };
 		049BD3B52E51F319001A566B /* MessageRouter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD3B02E51F319001A566B /* MessageRouter.swift */; };
-		ABCD00022E5CCCC300162C4A /* ReadReceiptTracker.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00012E5CCCC300162C4A /* ReadReceiptTracker.swift */; };
-		ABCD00032E5CCCC300162C4A /* ReadReceiptTracker.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00012E5CCCC300162C4A /* ReadReceiptTracker.swift */; };
-		ABCD00052E5CCCC300162C4C /* NostrInboxService.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00042E5CCCC300162C4C /* NostrInboxService.swift */; };
-		ABCD00062E5CCCC300162C4D /* NostrInboxService.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00042E5CCCC300162C4C /* NostrInboxService.swift */; };
-		ABCD00082E5CCCC300162C4E /* NostrOutboxService.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00072E5CCCC300162C4E /* NostrOutboxService.swift */; };
-		ABCD00092E5CCCC300162C4F /* NostrOutboxService.swift in Sources */ = {isa = PBXBuildFile; fileRef = ABCD00072E5CCCC300162C4E /* NostrOutboxService.swift */; };
 		0AE840940F21AFC07C226636 /* PrivateChatE2ETests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8A262EDDC04B7D7B5E31F321 /* PrivateChatE2ETests.swift */; };
 		0B6F25559A21F8C69C8357C6 /* BinaryProtocolTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0B3CC6FA298729906109F61B /* BinaryProtocolTests.swift */; };
 		10E68BB889356219189E38EC /* BitchatApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = EF625BB3AD919322C01A46B2 /* BitchatApp.swift */; };
@@ -211,6 +209,8 @@
 		047502B32E55FED60083520F /* MeshPeerList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MeshPeerList.swift; sourceTree = "<group>"; };
 		047502B82E560F690083520F /* RelayController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RelayController.swift; sourceTree = "<group>"; };
 		048A4BE62E5CCCC300162C4A /* TransportConfig.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TransportConfig.swift; sourceTree = "<group>"; };
+		048A4C272E5FCD6600162C4A /* GeohashBookmarksStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeohashBookmarksStore.swift; sourceTree = "<group>"; };
+		048A4C2A2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeohashBookmarksStoreTests.swift; sourceTree = "<group>"; };
 		049BD38C2E4EC4F0001A566B /* AutocompleteService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutocompleteService.swift; sourceTree = "<group>"; };
 		049BD38D2E4EC4F0001A566B /* CommandProcessor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CommandProcessor.swift; sourceTree = "<group>"; };
 		049BD38F2E4EC4F0001A566B /* PrivateChatManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PrivateChatManager.swift; sourceTree = "<group>"; };
@@ -219,9 +219,6 @@
 		049BD39E2E51DBF4001A566B /* Packets.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Packets.swift; sourceTree = "<group>"; };
 		049BD39F2E51DBF4001A566B /* PeerID.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PeerID.swift; sourceTree = "<group>"; };
 		049BD3A42E51DC0E001A566B /* MessageDeduplicator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MessageDeduplicator.swift; sourceTree = "<group>"; };
-		ABCD00012E5CCCC300162C4A /* ReadReceiptTracker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ReadReceiptTracker.swift; sourceTree = "<group>"; };
-		ABCD00042E5CCCC300162C4C /* NostrInboxService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NostrInboxService.swift; sourceTree = "<group>"; };
-		ABCD00072E5CCCC300162C4E /* NostrOutboxService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NostrOutboxService.swift; sourceTree = "<group>"; };
 		049BD3AA2E51E38E001A566B /* PeerIDResolver.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PeerIDResolver.swift; sourceTree = "<group>"; };
 		049BD3AD2E51ED60001A566B /* Transport.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Transport.swift; sourceTree = "<group>"; };
 		049BD3B02E51F319001A566B /* MessageRouter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MessageRouter.swift; sourceTree = "<group>"; };
@@ -492,6 +489,7 @@
 		C3D98EB3E1B455E321F519F4 /* bitchatTests */ = {
 			isa = PBXGroup;
 			children = (
+				048A4C2A2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift */,
 				D69A18D27F9A565FD6041E12 /* Info.plist */,
 				047502912E547ACC0083520F /* LocationChannelsTests.swift */,
 				C272F137CE00FC5A96E0CC06 /* NostrProtocolTests.swift */,
@@ -528,10 +526,8 @@
 		D98A3186D7E4C72E35BDF7FE /* Services */ = {
 			isa = PBXGroup;
 			children = (
+				048A4C272E5FCD6600162C4A /* GeohashBookmarksStore.swift */,
 				048A4BE62E5CCCC300162C4A /* TransportConfig.swift */,
-				ABCD00012E5CCCC300162C4A /* ReadReceiptTracker.swift */,
-				ABCD00042E5CCCC300162C4C /* NostrInboxService.swift */,
-				ABCD00072E5CCCC300162C4E /* NostrOutboxService.swift */,
 				AA77BB10CC22DD33EE44FF55 /* VerificationService.swift */,
 				047502B82E560F690083520F /* RelayController.swift */,
 				0475028B2E54171C0083520F /* LocationChannelManager.swift */,
@@ -754,11 +750,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-                048A4BE72E5CCCC300162C4A /* TransportConfig.swift in Sources */,
+				048A4BE72E5CCCC300162C4A /* TransportConfig.swift in Sources */,
-                ABCD00022E5CCCC300162C4A /* ReadReceiptTracker.swift in Sources */,
+				1234567890ABCDEFFEDCBA13 /* PeerDisplayNameResolver.swift in Sources */,
-                ABCD00052E5CCCC300162C4C /* NostrInboxService.swift in Sources */,
-                ABCD00082E5CCCC300162C4E /* NostrOutboxService.swift in Sources */,
-                1234567890ABCDEFFEDCBA13 /* PeerDisplayNameResolver.swift in Sources */,
 				AA77BB12CC22DD33EE44FF56 /* VerificationService.swift in Sources */,
 				AA77BB15CC22DD33EE44FF59 /* VerificationViews.swift in Sources */,
 				A1B2C3D54E5F60718293A4B6 /* XChaCha20Poly1305Compat.swift in Sources */,
@@ -786,6 +779,7 @@
 				0475028C2E54171C0083520F /* LocationChannelManager.swift in Sources */,
 				AFF33EF44626EF0579D17EB1 /* NoiseHandshakeCoordinator.swift in Sources */,
 				8C1AB0F2D48207E0755DA91A /* NoiseProtocol.swift in Sources */,
+				048A4C282E5FCD6600162C4A /* GeohashBookmarksStore.swift in Sources */,
 				049BD3AC2E51E38E001A566B /* PeerIDResolver.swift in Sources */,
 				D691938B4029A04CC905FDC8 /* NoiseSecurityConsiderations.swift in Sources */,
 				8A14ADADF5CD7A79919CB655 /* NoiseSession.swift in Sources */,
@@ -816,11 +810,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-                048A4BE82E5CCCC300162C4A /* TransportConfig.swift in Sources */,
+				048A4BE82E5CCCC300162C4A /* TransportConfig.swift in Sources */,
-                ABCD00032E5CCCC300162C4A /* ReadReceiptTracker.swift in Sources */,
+				1234567890ABCDEFFEDCBA14 /* PeerDisplayNameResolver.swift in Sources */,
-                ABCD00062E5CCCC300162C4D /* NostrInboxService.swift in Sources */,
-                ABCD00092E5CCCC300162C4F /* NostrOutboxService.swift in Sources */,
-                1234567890ABCDEFFEDCBA14 /* PeerDisplayNameResolver.swift in Sources */,
 				AA77BB11CC22DD33EE44FF55 /* VerificationService.swift in Sources */,
 				AA77BB14CC22DD33EE44FF58 /* VerificationViews.swift in Sources */,
 				A1B2C3D44E5F60718293A4B5 /* XChaCha20Poly1305Compat.swift in Sources */,
@@ -848,6 +839,7 @@
 				0475028D2E54171C0083520F /* LocationChannelManager.swift in Sources */,
 				6D0D4A0B1D8B659DCBAE7C9C /* NoiseHandshakeCoordinator.swift in Sources */,
 				A7187D48B07C6857DE01D0ED /* NoiseProtocol.swift in Sources */,
+				048A4C292E5FCD6600162C4A /* GeohashBookmarksStore.swift in Sources */,
 				049BD3AB2E51E38E001A566B /* PeerIDResolver.swift in Sources */,
 				9CCF09F7527EC681A13FC246 /* NoiseSecurityConsiderations.swift in Sources */,
 				92D1CF17DF88EA298F6E5E8E /* NoiseSession.swift in Sources */,
@@ -884,6 +876,7 @@
 				047502B12E55E8450083520F /* InputValidatorTests.swift in Sources */,
 				D727EA273CB214FC32612469 /* MockBluetoothMeshService.swift in Sources */,
 				047502932E547ACC0083520F /* LocationChannelsTests.swift in Sources */,
+				048A4C2B2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift in Sources */,
 				6C803BF930E7E19BE6E99EAA /* MockBLEService.swift in Sources */,
 				765254F56997F01054699AC0 /* NoiseProtocolTests.swift in Sources */,
 				968181D255CA7A804340B4DA /* NostrProtocolTests.swift in Sources */,
@@ -906,6 +899,7 @@
 				047502B02E55E8450083520F /* InputValidatorTests.swift in Sources */,
 				8851F08D88C5B1DE7B9F55C6 /* MockBluetoothMeshService.swift in Sources */,
 				047502922E547ACC0083520F /* LocationChannelsTests.swift in Sources */,
+				048A4C2C2E5FCE0300162C4A /* GeohashBookmarksStoreTests.swift in Sources */,
 				3849CA6D99B2D536636DF4A6 /* MockBLEService.swift in Sources */,
 				BC4DC75F4FB823FF40569676 /* NoiseProtocolTests.swift in Sources */,
 				EE8C3ECADAB3083A2687D50B /* NostrProtocolTests.swift in Sources */,

bitchat/Identity/SecureIdentityStateManager.swift

@@ -310,7 +310,7 @@ class SecureIdentityStateManager {
     func getCryptoIdentitiesByPeerIDPrefix(_ peerID: String) -> [CryptographicIdentity] {
         queue.sync {
             // Defensive: ensure hex and correct length
-            guard PeerIDResolver.isShortID(peerID) else { return [] }
+            guard peerID.count == 16, peerID.allSatisfy({ $0.isHexDigit }) else { return [] }
             return cryptographicIdentities.values.filter { $0.fingerprint.hasPrefix(peerID) }
         }
     }

bitchat/Protocols/BinaryEncodingUtils.swift

@@ -6,7 +6,6 @@
 //
 
 import Foundation
-import CryptoKit
 
 // MARK: - Hex Encoding/Decoding
 
@@ -36,16 +35,6 @@ extension Data {
     }
 }
 
-// MARK: - Fingerprint Helpers
-
-extension Data {
-    /// SHA-256 over data, hex-encoded (lowercase)
-    func sha256Fingerprint() -> String {
-        let hash = SHA256.hash(data: self)
-        return hash.map { String(format: "%02x", $0) }.joined()
-    }
-}
-
 // MARK: - Binary Encoding Utilities
 
 extension Data {
@@ -231,3 +220,4 @@ extension Data {
         return data
     }
 }
+

bitchat/Protocols/Geohash.swift

@@ -87,4 +87,28 @@ enum Geohash {
         let lon = (lonInterval.0 + lonInterval.1) / 2
         return (lat, lon)
     }
+
+    /// Decodes a geohash into its latitude and longitude bounds.
+    /// - Parameter geohash: Base32 geohash string.
+    /// - Returns: (latMin, latMax, lonMin, lonMax)
+    static func decodeBounds(_ geohash: String) -> (latMin: Double, latMax: Double, lonMin: Double, lonMax: Double) {
+        var latInterval: (Double, Double) = (-90.0, 90.0)
+        var lonInterval: (Double, Double) = (-180.0, 180.0)
+
+        var isEven = true
+        for ch in geohash.lowercased() {
+            guard let cd = base32Map[ch] else { continue }
+            for mask in [16, 8, 4, 2, 1] {
+                if isEven {
+                    let mid = (lonInterval.0 + lonInterval.1) / 2
+                    if (cd & mask) != 0 { lonInterval.0 = mid } else { lonInterval.1 = mid }
+                } else {
+                    let mid = (latInterval.0 + latInterval.1) / 2
+                    if (cd & mask) != 0 { latInterval.0 = mid } else { latInterval.1 = mid }
+                }
+                isEven.toggle()
+            }
+        }
+        return (latInterval.0, latInterval.1, lonInterval.0, lonInterval.1)
+    }
 }

bitchat/Services/BLEService.swift

@@ -512,7 +512,7 @@ final class BLEService: NSObject {
     func isPeerConnected(_ peerID: String) -> Bool {
         // Accept both 16-hex short IDs and 64-hex Noise keys
         let shortID: String = {
-            if PeerIDResolver.isNoiseKeyHex(peerID), let key = Data(hexString: peerID) {
+            if peerID.count == 64, let key = Data(hexString: peerID) {
                 return PeerIDUtils.derivePeerID(fromPublicKey: key)
             }
             return peerID
@@ -523,7 +523,7 @@ final class BLEService: NSObject {
     func isPeerReachable(_ peerID: String) -> Bool {
         // Accept both 16-hex short IDs and 64-hex Noise keys
         let shortID: String = {
-            if PeerIDResolver.isNoiseKeyHex(peerID), let key = Data(hexString: peerID) {
+            if peerID.count == 64, let key = Data(hexString: peerID) {
                 return PeerIDUtils.derivePeerID(fromPublicKey: key)
             }
             return peerID
@@ -664,7 +664,8 @@ final class BLEService: NSObject {
         return collectionsQueue.sync {
             if let publicKey = peers[peerID]?.noisePublicKey {
                 // Use the same fingerprinting method as NoiseEncryptionService/UnifiedPeerService (SHA-256 of raw key)
-                return publicKey.sha256Fingerprint()
+                let hash = SHA256.hash(data: publicKey)
+                return hash.map { String(format: "%02x", $0) }.joined()
             }
             return nil
         }

bitchat/Services/FavoritesPersistenceService.swift

@@ -181,7 +181,7 @@ class FavoritesPersistenceService: ObservableObject {
     /// Falls back to scanning favorites and matching on derived peer ID.
     func getFavoriteStatus(forPeerID peerID: String) -> FavoriteRelationship? {
         // Quick sanity: peerID should be 16 hex chars (8 bytes)
-        guard PeerIDResolver.isShortID(peerID) else { return nil }
+        guard peerID.count == 16 else { return nil }
         for (pubkey, rel) in favorites {
             let derived = PeerIDUtils.derivePeerID(fromPublicKey: pubkey)
             if derived == peerID { return rel }

bitchat/Services/GeohashBookmarksStore.swift

@@ -0,0 +1,227 @@
+import Foundation
+import Combine
+#if os(iOS) || os(macOS)
+import CoreLocation
+#endif
+
+/// Stores a user-maintained list of bookmarked geohash channels.
+/// - Persistence: UserDefaults (JSON string array)
+/// - Semantics: geohashes are normalized to lowercase base32 and de-duplicated
+final class GeohashBookmarksStore: ObservableObject {
+    static let shared = GeohashBookmarksStore()
+
+    @Published private(set) var bookmarks: [String] = []
+    @Published private(set) var bookmarkNames: [String: String] = [:] // geohash -> friendly name
+
+    private let storeKey = "locationChannel.bookmarks"
+    private let namesStoreKey = "locationChannel.bookmarkNames"
+    private var membership: Set<String> = []
+    #if os(iOS) || os(macOS)
+    private let geocoder = CLGeocoder()
+    private var resolving: Set<String> = []
+    #endif
+
+    private init() {
+        load()
+    }
+
+    // MARK: - Public API
+    func isBookmarked(_ geohash: String) -> Bool {
+        return membership.contains(Self.normalize(geohash))
+    }
+
+    func toggle(_ geohash: String) {
+        let gh = Self.normalize(geohash)
+        if membership.contains(gh) {
+            remove(gh)
+        } else {
+            add(gh)
+        }
+    }
+
+    func add(_ geohash: String) {
+        let gh = Self.normalize(geohash)
+        guard !gh.isEmpty else { return }
+        guard !membership.contains(gh) else { return }
+        bookmarks.insert(gh, at: 0)
+        membership.insert(gh)
+        persist()
+        // Resolve and persist a friendly name once when added
+        resolveNameIfNeeded(for: gh)
+    }
+
+    func remove(_ geohash: String) {
+        let gh = Self.normalize(geohash)
+        guard membership.contains(gh) else { return }
+        if let idx = bookmarks.firstIndex(of: gh) { bookmarks.remove(at: idx) }
+        membership.remove(gh)
+        // Clean up stored name to avoid stale cache growth
+        if bookmarkNames.removeValue(forKey: gh) != nil {
+            persistNames()
+        }
+        persist()
+    }
+
+    // MARK: - Persistence
+    private func load() {
+        guard let data = UserDefaults.standard.data(forKey: storeKey) else { return }
+        if let arr = try? JSONDecoder().decode([String].self, from: data) {
+            // Sanitize, normalize, dedupe while preserving order (first occurrence wins)
+            var seen = Set<String>()
+            var list: [String] = []
+            for raw in arr {
+                let gh = Self.normalize(raw)
+                guard !gh.isEmpty else { continue }
+                if !seen.contains(gh) {
+                    seen.insert(gh)
+                    list.append(gh)
+                }
+            }
+            bookmarks = list
+            membership = seen
+        }
+        // Load any saved names
+        if let namesData = UserDefaults.standard.data(forKey: namesStoreKey),
+           let dict = try? JSONDecoder().decode([String: String].self, from: namesData) {
+            bookmarkNames = dict
+        }
+    }
+
+    private func persist() {
+        if let data = try? JSONEncoder().encode(bookmarks) {
+            UserDefaults.standard.set(data, forKey: storeKey)
+        }
+    }
+
+    private func persistNames() {
+        if let data = try? JSONEncoder().encode(bookmarkNames) {
+            UserDefaults.standard.set(data, forKey: namesStoreKey)
+        }
+    }
+
+    // MARK: - Helpers
+    private static func normalize(_ s: String) -> String {
+        let allowed = Set("0123456789bcdefghjkmnpqrstuvwxyz")
+        return s
+            .trimmingCharacters(in: .whitespacesAndNewlines)
+            .lowercased()
+            .replacingOccurrences(of: "#", with: "")
+            .filter { allowed.contains($0) }
+    }
+
+    // MARK: - Name Resolution
+    /// Attempt to resolve and persist a friendly place name for a bookmarked geohash.
+    func resolveNameIfNeeded(for geohash: String) {
+        let gh = Self.normalize(geohash)
+        guard !gh.isEmpty else { return }
+        if bookmarkNames[gh] != nil { return }
+        #if os(iOS) || os(macOS)
+        if resolving.contains(gh) { return }
+        resolving.insert(gh)
+        // For very coarse geohashes, sample multiple points to capture multiple admin areas
+        if gh.count <= 2 {
+            let b = Geohash.decodeBounds(gh)
+            let pts: [CLLocation] = [
+                CLLocation(latitude: (b.latMin + b.latMax) / 2, longitude: (b.lonMin + b.lonMax) / 2), // center
+                CLLocation(latitude: b.latMin, longitude: b.lonMin),
+                CLLocation(latitude: b.latMin, longitude: b.lonMax),
+                CLLocation(latitude: b.latMax, longitude: b.lonMin),
+                CLLocation(latitude: b.latMax, longitude: b.lonMax)
+            ]
+            resolveCompositeAdminName(geohash: gh, points: pts)
+        } else {
+            let center = Geohash.decodeCenter(gh)
+            let loc = CLLocation(latitude: center.lat, longitude: center.lon)
+            geocoder.reverseGeocodeLocation(loc) { [weak self] placemarks, _ in
+                guard let self = self else { return }
+                defer { self.resolving.remove(gh) }
+                if let pm = placemarks?.first {
+                    let name = Self.nameForGeohashLength(gh.count, from: pm)
+                    if let name = name, !name.isEmpty {
+                        DispatchQueue.main.async {
+                            self.bookmarkNames[gh] = name
+                            self.persistNames()
+                        }
+                    }
+                }
+            }
+        }
+        #endif
+    }
+
+    #if os(iOS) || os(macOS)
+    private func resolveCompositeAdminName(geohash gh: String, points: [CLLocation]) {
+        var uniqueAdmins = OrderedSet<String>()
+        var idx = 0
+        func step() {
+            if idx >= points.count {
+                // Compose up to 2 names joined by ' and '
+                let finalName: String? = {
+                    let names = uniqueAdmins.array
+                    if names.count >= 2 { return names[0] + " and " + names[1] }
+                    return names.first
+                }()
+                if let finalName = finalName, !finalName.isEmpty {
+                    DispatchQueue.main.async {
+                        self.bookmarkNames[gh] = finalName
+                        self.persistNames()
+                    }
+                }
+                self.resolving.remove(gh)
+                return
+            }
+            let loc = points[idx]
+            idx += 1
+            geocoder.reverseGeocodeLocation(loc) { [weak self] placemarks, _ in
+                guard self != nil else { return }
+                if let pm = placemarks?.first {
+                    if let admin = pm.administrativeArea, !admin.isEmpty {
+                        uniqueAdmins.insert(admin)
+                    } else if let country = pm.country, !country.isEmpty {
+                        uniqueAdmins.insert(country)
+                    }
+                }
+                // Proceed to next point
+                step()
+            }
+        }
+        step()
+    }
+
+    // Minimal ordered-set for stable joining
+    private struct OrderedSet<Element: Hashable> {
+        private var set: Set<Element> = []
+        private(set) var array: [Element] = []
+        mutating func insert(_ element: Element) {
+            if set.insert(element).inserted { array.append(element) }
+        }
+    }
+
+    private static func nameForGeohashLength(_ len: Int, from pm: CLPlacemark) -> String? {
+        switch len {
+        case 0...2:
+            // Prefer administrative area if available at this coarse level
+            return pm.administrativeArea ?? pm.country
+        case 3...4:
+            return pm.administrativeArea ?? pm.subAdministrativeArea ?? pm.country
+        case 5:
+            return pm.locality ?? pm.subAdministrativeArea ?? pm.administrativeArea
+        case 6...7:
+            return pm.subLocality ?? pm.locality ?? pm.administrativeArea
+        default:
+            return pm.subLocality ?? pm.locality ?? pm.administrativeArea ?? pm.country
+        }
+    }
+    #endif
+
+    #if DEBUG
+    /// Testing-only reset helper
+    func _resetForTesting() {
+        bookmarks.removeAll()
+        membership.removeAll()
+        bookmarkNames.removeAll()
+        persist()
+        persistNames()
+    }
+    #endif
+}

bitchat/Services/LocationChannelManager.swift

@@ -50,10 +50,8 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
            let arr = try? JSONDecoder().decode([String].self, from: data) {
             teleportedSet = Set(arr)
         }
-        // Initialize teleported flag from persisted state if a location channel is selected
+        // Do not eagerly mark teleported on startup; wait for location to compute regional set.
-        if case .location(let ch) = selectedChannel {
+        // This avoids showing teleported for in-region channels during cold start.
-            teleported = teleportedSet.contains(ch.geohash)
-        }
         let status: CLAuthorizationStatus
         if #available(iOS 14.0, macOS 11.0, *) {
             status = cl.authorizationStatus
@@ -61,6 +59,15 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
             status = CLLocationManager.authorizationStatus()
         }
         updatePermissionState(from: status)
+        // If we don't have location authorization at startup, fall back to persisted teleport state
+        switch status {
+        case .authorizedAlways, .authorizedWhenInUse, .authorized:
+            break // will compute from location
+        default:
+            if case .location(let ch) = selectedChannel {
+                teleported = teleportedSet.contains(ch.geohash)
+            }
+        }
     }
 
     // MARK: - Public API
@@ -129,7 +136,21 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
             case .mesh:
                 self.teleported = false
             case .location(let ch):
-                self.teleported = self.teleportedSet.contains(ch.geohash)
+                // If this geohash is in our current regional set, do NOT mark teleported.
+                let inRegional = self.availableChannels.contains { $0.geohash == ch.geohash }
+                if inRegional {
+                    self.teleported = false
+                    // Clear persisted teleport for this geohash to keep future selections clean
+                    if self.teleportedSet.contains(ch.geohash) {
+                        self.teleportedSet.remove(ch.geohash)
+                        if let data = try? JSONEncoder().encode(Array(self.teleportedSet)) {
+                            UserDefaults.standard.set(data, forKey: self.teleportedStoreKey)
+                        }
+                    }
+                } else {
+                    // Fall back to persisted mark (set by deep link or manual teleport)
+                    self.teleported = self.teleportedSet.contains(ch.geohash)
+                }
             }
         }
     }
@@ -202,14 +223,25 @@ final class LocationChannelManager: NSObject, CLLocationManagerDelegate, Observa
         }
         Task { @MainActor in
             self.availableChannels = result
-            // Recompute teleported status based on persisted state OR current location vs selected channel
+            // Recompute teleported status based on whether the selected geohash is in our regional set
             switch self.selectedChannel {
             case .mesh:
                 self.teleported = false
             case .location(let ch):
-                let persisted = self.teleportedSet.contains(ch.geohash)
+                // Membership check using freshly computed regional channels; avoids precision/rename drift
-                let currentGH = Geohash.encode(latitude: coord.latitude, longitude: coord.longitude, precision: ch.level.precision)
+                let inRegional = result.contains { $0.geohash == ch.geohash }
-                self.teleported = persisted || (currentGH != ch.geohash)
+                if inRegional {
+                    self.teleported = false
+                    // Clear persisted teleport flag if present
+                    if self.teleportedSet.contains(ch.geohash) {
+                        self.teleportedSet.remove(ch.geohash)
+                        if let data = try? JSONEncoder().encode(Array(self.teleportedSet)) {
+                            UserDefaults.standard.set(data, forKey: self.teleportedStoreKey)
+                        }
+                    }
+                } else {
+                    self.teleported = true
+                }
             }
         }
     }

bitchat/Services/MessageRouter.swift

@@ -4,12 +4,13 @@ import Foundation
 @MainActor
 final class MessageRouter {
     private let mesh: Transport
-    private let nostr: NostrOutboxService
+    private let nostr: NostrTransport
     private var outbox: [String: [(content: String, nickname: String, messageID: String)]] = [:] // peerID -> queued messages
 
-    init(mesh: Transport, nostr: NostrOutboxService) {
+    init(mesh: Transport, nostr: NostrTransport) {
         self.mesh = mesh
         self.nostr = nostr
+        self.nostr.senderPeerID = mesh.myPeerID
 
         // Observe favorites changes to learn Nostr mapping and flush queued messages
         NotificationCenter.default.addObserver(
@@ -45,7 +46,7 @@ final class MessageRouter {
         } else if canSendViaNostr(peerID: peerID) {
             SecureLogger.log("Routing PM via Nostr to \(peerID.prefix(8))… id=\(messageID.prefix(8))…",
                             category: SecureLogger.session, level: .debug)
-            nostr.sendPrivate(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
+            nostr.sendPrivateMessage(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
         } else {
             // Queue for later (when mesh connects or Nostr mapping appears)
             if outbox[peerID] == nil { outbox[peerID] = [] }

bitchat/Services/NoiseEncryptionService.swift

@@ -548,7 +548,8 @@ class NoiseEncryptionService {
     }
     
     private func calculateFingerprint(for publicKey: Curve25519.KeyAgreement.PublicKey) -> String {
-        return publicKey.rawRepresentation.sha256Fingerprint()
+        let hash = SHA256.hash(data: publicKey.rawRepresentation)
+        return hash.map { String(format: "%02x", $0) }.joined()
     }
         
     // MARK: - Session Maintenance

bitchat/Services/NostrInboxService.swift

@@ -1,90 +0,0 @@
-//
-// NostrInboxService.swift
-// bitchat
-//
-// Centralizes Nostr subscribe/unsubscribe and event de-duplication for inbox flows.
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-
-@MainActor
-final class NostrInboxService {
-    private var processedIDs: Set<String> = []
-    private var order: [String] = []
-    private let cap: Int
-
-    init(capacity: Int = TransportConfig.uiProcessedNostrEventsCap) {
-        self.cap = capacity
-    }
-
-    private func track(_ id: String) -> Bool {
-        if processedIDs.contains(id) { return false }
-        processedIDs.insert(id)
-        order.append(id)
-        if order.count > cap {
-            let overflow = order.count - cap
-            for _ in 0..<overflow {
-                if let oldest = order.first {
-                    order.removeFirst()
-                    processedIDs.remove(oldest)
-                }
-            }
-        }
-        return true
-    }
-
-    func reset() {
-        processedIDs.removeAll()
-        order.removeAll()
-    }
-
-    // Subscribe to public geohash ephemeral events (kind 20000)
-    @discardableResult
-    func subscribeGeohashEphemeral(
-        geohash: String,
-        lookbackSeconds: TimeInterval,
-        limit: Int,
-        relayCount: Int,
-        subID: String? = nil,
-        handler: @escaping (NostrEvent) -> Void
-    ) -> String {
-        let id = subID ?? "geo-\(geohash)"
-        let filter = NostrFilter.geohashEphemeral(
-            geohash,
-            since: Date().addingTimeInterval(-lookbackSeconds),
-            limit: limit
-        )
-        let relays = GeoRelayDirectory.shared.closestRelays(toGeohash: geohash, count: relayCount)
-        NostrRelayManager.shared.subscribe(filter: filter, id: id, relayUrls: relays) { [weak self] event in
-            guard let self = self else { return }
-            guard event.kind == NostrProtocol.EventKind.ephemeralEvent.rawValue else { return }
-            guard self.track(event.id) else { return }
-            handler(event)
-        }
-        return id
-    }
-
-    // Subscribe to gift wraps (DMs) for a given pubkey
-    @discardableResult
-    func subscribeGiftWrapsFor(
-        pubkeyHex: String,
-        lookbackSeconds: TimeInterval,
-        subID: String? = nil,
-        handler: @escaping (NostrEvent) -> Void
-    ) -> String {
-        let id = subID ?? "dm-\(pubkeyHex.prefix(8))"
-        let filter = NostrFilter.giftWrapsFor(pubkey: pubkeyHex, since: Date().addingTimeInterval(-lookbackSeconds))
-        NostrRelayManager.shared.subscribe(filter: filter, id: id) { [weak self] event in
-            guard let self = self else { return }
-            guard self.track(event.id) else { return }
-            handler(event)
-        }
-        return id
-    }
-
-    func unsubscribe(id: String) {
-        NostrRelayManager.shared.unsubscribe(id: id)
-    }
-}

bitchat/Services/NostrOutboxService.swift

@@ -1,50 +0,0 @@
-//
-// NostrOutboxService.swift
-// bitchat
-//
-// Centralized Nostr outbox for sending PMs and ACKs.
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-
-@MainActor
-final class NostrOutboxService {
-    private let transport: NostrTransport
-
-    init(meshService: Transport) {
-        let t = NostrTransport()
-        t.senderPeerID = meshService.myPeerID
-        self.transport = t
-    }
-
-    func sendGeohashPM(content: String, toRecipientHex recipientHex: String, from identity: NostrIdentity, messageID: String) {
-        transport.sendPrivateMessageGeohash(content: content, toRecipientHex: recipientHex, from: identity, messageID: messageID)
-    }
-
-    func sendGeohashDeliveredAck(messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity) {
-        transport.sendDeliveryAckGeohash(for: messageID, toRecipientHex: recipientHex, from: identity)
-    }
-
-    func sendGeohashReadAck(messageID: String, toRecipientHex recipientHex: String, from identity: NostrIdentity) {
-        transport.sendReadReceiptGeohash(messageID, toRecipientHex: recipientHex, from: identity)
-    }
-
-    // MARK: - Generic outbox via favorites mapping
-    func sendPrivate(_ content: String, to peerID: String, recipientNickname: String, messageID: String) {
-        transport.sendPrivateMessage(content, to: peerID, recipientNickname: recipientNickname, messageID: messageID)
-    }
-
-    func sendReadReceipt(_ receipt: ReadReceipt, to peerID: String) {
-        transport.sendReadReceipt(receipt, to: peerID)
-    }
-
-    func sendDeliveryAck(for messageID: String, to peerID: String) {
-        transport.sendDeliveryAck(for: messageID, to: peerID)
-    }
-
-    func sendFavoriteNotification(to peerID: String, isFavorite: Bool) {
-        transport.sendFavoriteNotification(to: peerID, isFavorite: isFavorite)
-    }
-}

bitchat/Services/NostrTransport.swift

@@ -167,7 +167,7 @@ final class NostrTransport: Transport {
            let npub = fav.peerNostrPublicKey {
             return npub
         }
-        if PeerIDResolver.isShortID(peerID),
+        if peerID.count == 16,
            let fav = FavoritesPersistenceService.shared.getFavoriteStatus(forPeerID: peerID),
            let npub = fav.peerNostrPublicKey {
             return npub

bitchat/Services/PrivateChatManager.swift

@@ -16,15 +16,14 @@ class PrivateChatManager: ObservableObject {
     @Published var unreadMessages: Set<String> = []
     
     private var selectedPeerFingerprint: String? = nil
-    private var readReceiptTracker: ReadReceiptTracker?
+    var sentReadReceipts: Set<String> = []  // Made accessible for ChatViewModel
     
     weak var meshService: Transport?
     // Route acks/receipts via MessageRouter (chooses mesh or Nostr)
     weak var messageRouter: MessageRouter?
     
-    init(meshService: Transport? = nil, readReceiptTracker: ReadReceiptTracker? = nil) {
+    init(meshService: Transport? = nil) {
         self.meshService = meshService
-        self.readReceiptTracker = readReceiptTracker
     }
 
     // Cap for messages stored per private chat
@@ -122,7 +121,7 @@ class PrivateChatManager: ObservableObject {
             unreadMessages.insert(senderPeerID)
             
             // Avoid notifying for messages already marked as read (dup/resubscribe cases)
-            if !(readReceiptTracker?.contains(message.id) ?? false) {
+            if !sentReadReceipts.contains(message.id) {
                 NotificationService.shared.sendPrivateMessageNotification(
                     from: message.sender,
                     message: message.content,
@@ -161,7 +160,7 @@ class PrivateChatManager: ObservableObject {
         // Send read receipts for unread messages that haven't been sent yet
         if let messages = privateChats[peerID] {
             for message in messages {
-                if message.senderPeerID == peerID && !message.isRelay && !(readReceiptTracker?.contains(message.id) ?? false) {
+                if message.senderPeerID == peerID && !message.isRelay && !sentReadReceipts.contains(message.id) {
                     sendReadReceipt(for: message)
                 }
             }
@@ -213,12 +212,12 @@ class PrivateChatManager: ObservableObject {
     // MARK: - Private Methods
     
     private func sendReadReceipt(for message: BitchatMessage) {
-        guard !(readReceiptTracker?.contains(message.id) ?? false),
+        guard !sentReadReceipts.contains(message.id),
               let senderPeerID = message.senderPeerID else {
             return
         }
         
-        readReceiptTracker?.insert(message.id)
+        sentReadReceipts.insert(message.id)
         
         // Create read receipt using the simplified method
         let receipt = ReadReceipt(

bitchat/Services/ReadReceiptTracker.swift

@@ -1,77 +0,0 @@
-//
-// ReadReceiptTracker.swift
-// bitchat
-//
-// Centralized tracker for sent read receipts with simple persistence.
-// This is free and unencumbered software released into the public domain.
-// For more information, see <https://unlicense.org>
-//
-
-import Foundation
-
-final class ReadReceiptTracker {
-    private let defaults: UserDefaults
-    private let key = "sentReadReceipts"
-    private let queue = DispatchQueue(label: "chat.bitchat.readreceipts", attributes: .concurrent)
-    private var set: Set<String> = []
-
-    init(defaults: UserDefaults = .standard) {
-        self.defaults = defaults
-        if let data = defaults.data(forKey: key),
-           let arr = try? JSONDecoder().decode([String].self, from: data) {
-            self.set = Set(arr)
-        }
-    }
-
-    func contains(_ id: String) -> Bool {
-        queue.sync { set.contains(id) }
-    }
-
-    func insert(_ id: String) {
-        queue.async(flags: .barrier) {
-            if self.set.insert(id).inserted { self.persist() }
-        }
-    }
-
-    func insert<S: Sequence>(_ ids: S) where S.Element == String {
-        queue.async(flags: .barrier) {
-            var changed = false
-            for id in ids { changed = self.set.insert(id).inserted || changed }
-            if changed { self.persist() }
-        }
-    }
-
-    func remove(_ id: String) {
-        queue.async(flags: .barrier) {
-            if self.set.remove(id) != nil { self.persist() }
-        }
-    }
-
-    func removeAll() {
-        queue.async(flags: .barrier) {
-            if !self.set.isEmpty { self.set.removeAll(); self.persist() }
-        }
-    }
-
-    /// Keep only IDs present in the allow-list; useful for pruning stale entries.
-    func prune(toAllowedIDs allowed: Set<String>) {
-        queue.async(flags: .barrier) {
-            let newSet = self.set.intersection(allowed)
-            if newSet.count != self.set.count { self.set = newSet; self.persist() }
-        }
-    }
-
-    /// Snapshot current set for read-only operations (avoid long-lived copies in hot paths)
-    func snapshot() -> Set<String> { queue.sync { set } }
-
-    private func persist() {
-        let arr = Array(set)
-        if let data = try? JSONEncoder().encode(arr) {
-            defaults.set(data, forKey: key)
-        } else {
-            SecureLogger.log("❌ Failed to encode read receipts for persistence",
-                             category: SecureLogger.session, level: .error)
-        }
-    }
-}
-

bitchat/Services/UnifiedPeerService.swift

@@ -412,4 +412,10 @@ class UnifiedPeerService: ObservableObject, TransportPeerEventsDelegate {
 
 // MARK: - Helper Extensions
 
-// Moved sha256Fingerprint() to BinaryEncodingUtils for reuse
+extension Data {
+    func sha256Fingerprint() -> String {
+        // Implementation matches existing fingerprint generation in NoiseEncryptionService
+        let hash = SHA256.hash(data: self)
+        return hash.map { String(format: "%02x", $0) }.joined()
+    }
+}

bitchat/Views/ContentView.swift

@@ -24,6 +24,7 @@ struct ContentView: View {
     
     @EnvironmentObject var viewModel: ChatViewModel
     @ObservedObject private var locationManager = LocationChannelManager.shared
+    @ObservedObject private var bookmarks = GeohashBookmarksStore.shared
     @State private var messageText = ""
     @State private var textFieldSelection: NSRange? = nil
     @FocusState private var isTextFieldFocused: Bool
@@ -164,6 +165,8 @@ struct ContentView: View {
         }
         .sheet(isPresented: $showAppInfo) {
             AppInfoView()
+                .onAppear { viewModel.isAppInfoPresented = true }
+                .onDisappear { viewModel.isAppInfoPresented = false }
         }
         .sheet(isPresented: Binding(
             get: { viewModel.showingFingerprintFor != nil },
@@ -278,8 +281,10 @@ struct ContentView: View {
                         }
                     }()
                     let items = windowedMessages.map { (uiID: "\(contextKey)|\($0.id)", message: $0) }
-                    
+                    // Filter out empty/whitespace-only messages to avoid blank rows
-                    ForEach(items, id: \.uiID) { item in
+                    let filteredItems = items.filter { !$0.message.content.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
+
+                    ForEach(filteredItems, id: \.uiID) { item in
                         let message = item.message
                         VStack(alignment: .leading, spacing: 0) {
                             // Check if current user is mentioned
@@ -459,7 +464,13 @@ struct ContentView: View {
                 }
                 let level = levelForLength(gh.count)
                 let ch = GeohashChannel(level: level, geohash: gh)
-                LocationChannelManager.shared.markTeleported(for: gh, true)
+                // Do not mark teleported when opening a geohash that is in our regional set.
+                // If availableChannels is empty (e.g., cold start), defer marking and let
+                // LocationChannelManager compute teleported based on actual location.
+                let inRegional = LocationChannelManager.shared.availableChannels.contains { $0.geohash == gh }
+                if !inRegional && !LocationChannelManager.shared.availableChannels.isEmpty {
+                    LocationChannelManager.shared.markTeleported(for: gh, true)
+                }
                 LocationChannelManager.shared.select(ChannelID.location(ch))
             }
             .onTapGesture(count: 3) {
@@ -1112,6 +1123,15 @@ struct ContentView: View {
                     .buttonStyle(.plain)
                     .accessibilityLabel("Open unread private chat")
                 }
+                // Bookmark toggle for current geohash (not shown for mesh)
+                if case .location(let ch) = locationManager.selectedChannel {
+                    Button(action: { GeohashBookmarksStore.shared.toggle(ch.geohash) }) {
+                        Image(systemName: GeohashBookmarksStore.shared.isBookmarked(ch.geohash) ? "bookmark.fill" : "bookmark")
+                            .font(.system(size: 12))
+                    }
+                    .buttonStyle(.plain)
+                    .accessibilityLabel("Toggle bookmark for #\(ch.geohash)")
+                }
                 // Location channels button '#'
                 Button(action: { showLocationChannelsSheet = true }) {
                     let badgeText: String = {
@@ -1166,6 +1186,13 @@ struct ContentView: View {
         .padding(.horizontal, 12)
         .sheet(isPresented: $showLocationChannelsSheet) {
             LocationChannelsSheet(isPresented: $showLocationChannelsSheet)
+                .onAppear { viewModel.isLocationChannelsSheetPresented = true }
+                .onDisappear { viewModel.isLocationChannelsSheetPresented = false }
+        }
+        .alert("heads up", isPresented: $viewModel.showScreenshotPrivacyWarning) {
+            Button("ok", role: .cancel) {}
+        } message: {
+            Text("screenshots of location channels will reveal your location. think before sharing publicly.")
         }
         .background(backgroundColor.opacity(0.95))
     }
@@ -1182,7 +1209,7 @@ struct ContentView: View {
     private func privateHeaderContent(for privatePeerID: String) -> some View {
         // Prefer short (mesh) ID whenever available for encryption/session status; keep stable key for display resolution only.
         let headerPeerID: String = {
-            if PeerIDResolver.isNoiseKeyHex(privatePeerID) {
+            if privatePeerID.count == 64 {
                 // Map stable Noise key to short ID if we know it (even if not directly connected)
                 if let short = viewModel.getShortIDForNoiseKey(privatePeerID) { return short }
             }
@@ -1207,14 +1234,14 @@ struct ContentView: View {
             if let fav = FavoritesPersistenceService.shared.getFavoriteStatus(for: Data(hexString: headerPeerID) ?? Data()),
                !fav.peerNickname.isEmpty { return fav.peerNickname }
             // Fallback: resolve from persisted social identity via fingerprint mapping
-            if PeerIDResolver.isShortID(headerPeerID) {
+            if headerPeerID.count == 16 {
                 let candidates = SecureIdentityStateManager.shared.getCryptoIdentitiesByPeerIDPrefix(headerPeerID)
                 if let id = candidates.first,
                    let social = SecureIdentityStateManager.shared.getSocialIdentity(for: id.fingerprint) {
                     if let pet = social.localPetname, !pet.isEmpty { return pet }
                     if !social.claimedNickname.isEmpty { return social.claimedNickname }
                 }
-            } else if PeerIDResolver.isNoiseKeyHex(headerPeerID), let keyData = Data(hexString: headerPeerID) {
+            } else if headerPeerID.count == 64, let keyData = Data(hexString: headerPeerID) {
                 let fp = keyData.sha256Fingerprint()
                 if let social = SecureIdentityStateManager.shared.getSocialIdentity(for: fp) {
                     if let pet = social.localPetname, !pet.isEmpty { return pet }
@@ -1298,7 +1325,7 @@ struct ContentView: View {
                             if !privatePeerID.hasPrefix("nostr_") {
                                 // Use short peer ID if available for encryption status (sessions keyed by short ID)
                                 let statusPeerID: String = {
-                                    if PeerIDResolver.isNoiseKeyHex(privatePeerID), let short = viewModel.getShortIDForNoiseKey(privatePeerID) {
+                                    if privatePeerID.count == 64, let short = viewModel.getShortIDForNoiseKey(privatePeerID) {
                                         return short
                                     }
                                     return headerPeerID

bitchat/Views/FingerprintView.swift

@@ -43,14 +43,14 @@ struct FingerprintView: View {
             VStack(alignment: .leading, spacing: 16) {
                 // Prefer short mesh ID for session/encryption status
                 let statusPeerID: String = {
-                    if PeerIDResolver.isNoiseKeyHex(peerID), let short = viewModel.getShortIDForNoiseKey(peerID) { return short }
+                    if peerID.count == 64, let short = viewModel.getShortIDForNoiseKey(peerID) { 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: statusPeerID) { return name }
-                    if PeerIDResolver.isNoiseKeyHex(peerID), let data = Data(hexString: peerID) {
+                    if peerID.count == 64, let data = Data(hexString: peerID) {
                         if let fav = FavoritesPersistenceService.shared.getFavoriteStatus(for: data), !fav.peerNickname.isEmpty { return fav.peerNickname }
                         let fp = data.sha256Fingerprint()
                         if let social = SecureIdentityStateManager.shared.getSocialIdentity(for: fp) {

bitchat/Views/LocationChannelsSheet.swift

@@ -8,6 +8,7 @@ import AppKit
 struct LocationChannelsSheet: View {
     @Binding var isPresented: Bool
     @ObservedObject private var manager = LocationChannelManager.shared
+    @ObservedObject private var bookmarks = GeohashBookmarksStore.shared
     @EnvironmentObject var viewModel: ChatViewModel
     @Environment(\.colorScheme) var colorScheme
     @State private var customGeohash: String = ""
@@ -98,7 +99,7 @@ struct LocationChannelsSheet: View {
 
     private var channelList: some View {
         List {
-            // Mesh option first
+            // Mesh option first (no bookmark)
             channelRow(title: meshTitleWithCount(), subtitlePrefix: "#bluetooth • \(bluetoothRangeString())", isSelected: isMeshSelected, titleColor: standardBlue, titleBold: meshCount() > 0) {
                 manager.select(ChannelID.mesh)
                 isPresented = false
@@ -112,7 +113,21 @@ struct LocationChannelsSheet: View {
                     let namePart = nameBase.map { formattedNamePrefix(for: channel.level) + $0 }
                     let subtitlePrefix = "#\(channel.geohash) • \(coverage)"
                     let highlight = viewModel.geohashParticipantCount(for: channel.geohash) > 0
-                    channelRow(title: geohashTitleWithCount(for: channel), subtitlePrefix: subtitlePrefix, subtitleName: namePart, isSelected: isSelected(channel), titleBold: highlight) {
+                    channelRow(
+                        title: geohashTitleWithCount(for: channel),
+                        subtitlePrefix: subtitlePrefix,
+                        subtitleName: namePart,
+                        isSelected: isSelected(channel),
+                        titleBold: highlight,
+                        trailingAccessory: {
+                            Button(action: { bookmarks.toggle(channel.geohash) }) {
+                                Image(systemName: bookmarks.isBookmarked(channel.geohash) ? "bookmark.fill" : "bookmark")
+                                    .font(.system(size: 14))
+                            }
+                            .buttonStyle(.plain)
+                            .padding(.leading, 8)
+                        }
+                    ) {
                         // Selecting a suggested nearby channel is not a teleport. Persist this.
                         manager.markTeleported(for: channel.geohash, false)
                         manager.select(ChannelID.location(channel))
@@ -188,6 +203,48 @@ struct LocationChannelsSheet: View {
                 }
             }
 
+            // Bookmarked geohashes
+            if !bookmarks.bookmarks.isEmpty {
+                VStack(alignment: .leading, spacing: 6) {
+                    Text("bookmarked")
+                        .font(.system(size: 12, design: .monospaced))
+                        .foregroundColor(.secondary)
+                }
+                .listRowSeparator(.hidden)
+                ForEach(bookmarks.bookmarks, id: \.self) { gh in
+                    let level = levelForLength(gh.count)
+                    let channel = GeohashChannel(level: level, geohash: gh)
+                    let coverage = coverageString(forPrecision: gh.count)
+                    let subtitle = "#\(gh) • \(coverage)"
+                    let name = bookmarks.bookmarkNames[gh]
+                    channelRow(
+                        title: geohashHashTitleWithCount(gh),
+                        subtitlePrefix: subtitle,
+                        subtitleName: name.map { formattedNamePrefix(for: level) + $0 },
+                        isSelected: isSelected(channel),
+                        trailingAccessory: {
+                            Button(action: { bookmarks.toggle(gh) }) {
+                                Image(systemName: bookmarks.isBookmarked(gh) ? "bookmark.fill" : "bookmark")
+                                    .font(.system(size: 14))
+                            }
+                            .buttonStyle(.plain)
+                            .padding(.leading, 8)
+                        }
+                    ) {
+                        // For bookmarked selection, mark teleported based on regional membership
+                        let inRegional = manager.availableChannels.contains { $0.geohash == gh }
+                        if !inRegional && !manager.availableChannels.isEmpty {
+                            manager.markTeleported(for: gh, true)
+                        } else {
+                            manager.markTeleported(for: gh, false)
+                        }
+                        manager.select(ChannelID.location(channel))
+                        isPresented = false
+                    }
+                    .onAppear { bookmarks.resolveNameIfNeeded(for: gh) }
+                }
+            }
+
             // Footer action inside the list
             if manager.permissionState == LocationChannelManager.PermissionState.authorized {
                 Button(action: {
@@ -220,14 +277,24 @@ struct LocationChannelsSheet: View {
         return false
     }
 
-    private func channelRow(title: String, subtitlePrefix: String, subtitleName: String? = nil, subtitleNameBold: Bool = false, isSelected: Bool, titleColor: Color? = nil, titleBold: Bool = false, action: @escaping () -> Void) -> some View {
+    @ViewBuilder
-        Button(action: action) {
+    private func channelRow(
-            HStack {
+        title: String,
-                VStack(alignment: .leading) {
+        subtitlePrefix: String,
-                    // Render title with smaller font for trailing count in parentheses
+        subtitleName: String? = nil,
-                    let parts = splitTitleAndCount(title)
+        subtitleNameBold: Bool = false,
-                    HStack(spacing: 4) {
+        isSelected: Bool,
-                        Text(parts.base)
+        titleColor: Color? = nil,
+        titleBold: Bool = false,
+        @ViewBuilder trailingAccessory: () -> some View = { EmptyView() },
+        action: @escaping () -> Void
+    ) -> some View {
+        HStack(alignment: .center, spacing: 8) {
+            VStack(alignment: .leading) {
+                // Render title with smaller font for trailing count in parentheses
+                let parts = splitTitleAndCount(title)
+                HStack(spacing: 4) {
+                    Text(parts.base)
                             .font(.system(size: 14, design: .monospaced))
                             .fontWeight(titleBold ? .bold : .regular)
                             .foregroundColor(titleColor ?? Color.primary)
@@ -237,20 +304,17 @@ struct LocationChannelsSheet: View {
                                 .foregroundColor(.secondary)
                         }
                     }
-                    HStack(spacing: 0) {
+                let subtitleFull: String = {
-                        Text(subtitlePrefix)
+                    if let name = subtitleName, !name.isEmpty {
-                            .font(.system(size: 12, design: .monospaced))
+                        return subtitlePrefix + " • " + name
-                            .foregroundColor(.secondary)
-                        if let name = subtitleName {
-                            Text(" • ")
-                                .font(.system(size: 12, design: .monospaced))
-                                .foregroundColor(.secondary)
-                            Text(name)
-                                .font(.system(size: 12, design: .monospaced))
-                                .fontWeight(subtitleNameBold ? .bold : .regular)
-                                .foregroundColor(.secondary)
-                        }
                     }
+                    return subtitlePrefix
+                }()
+                Text(subtitleFull)
+                    .font(.system(size: 12, design: .monospaced))
+                    .foregroundColor(.secondary)
+                    .lineLimit(1)
+                    .truncationMode(.tail)
                 }
                 Spacer()
                 if isSelected {
@@ -258,11 +322,11 @@ struct LocationChannelsSheet: View {
                         .font(.system(size: 16, design: .monospaced))
                         .foregroundColor(standardGreen)
                 }
+                trailingAccessory()
             }
             .frame(maxWidth: .infinity, alignment: .leading)
-            .contentShape(Rectangle())
+        .contentShape(Rectangle())
-        }
+        .onTapGesture(perform: action)
-        .buttonStyle(.plain)
     }
 
     // Split a title like "#mesh [3 people]" into base and suffix "[3 people]"
@@ -291,12 +355,19 @@ struct LocationChannelsSheet: View {
     }
 
     private func geohashTitleWithCount(for channel: GeohashChannel) -> String {
-        // Use ViewModel's 5-minute activity counts; may be 0 for non-selected channels
+        // Main list: keep level labels (block/neighborhood/city/province/region)
         let count = viewModel.geohashParticipantCount(for: channel.geohash)
         let noun = count == 1 ? "person" : "people"
         return "\(channel.level.displayName.lowercased()) [\(count) \(noun)]"
     }
 
+    private func geohashHashTitleWithCount(_ geohash: String) -> String {
+        // Bookmarked list: show the #geohash as the main label
+        let count = viewModel.geohashParticipantCount(for: geohash)
+        let noun = count == 1 ? "person" : "people"
+        return "#\(geohash) [\(count) \(noun)]"
+    }
+
     private func validateGeohash(_ s: String) -> Bool {
         let allowed = Set("0123456789bcdefghjkmnpqrstuvwxyz")
         guard !s.isEmpty, s.count <= 12 else { return false }

bitchatTests/GeohashBookmarksStoreTests.swift

@@ -0,0 +1,51 @@
+import XCTest
+@testable import bitchat
+
+final class GeohashBookmarksStoreTests: XCTestCase {
+    let storeKey = "locationChannel.bookmarks"
+
+    override func setUp() {
+        super.setUp()
+        // Clear persisted state before each test
+        UserDefaults.standard.removeObject(forKey: storeKey)
+        GeohashBookmarksStore.shared._resetForTesting()
+    }
+
+    override func tearDown() {
+        // Clean after each test
+        UserDefaults.standard.removeObject(forKey: storeKey)
+        GeohashBookmarksStore.shared._resetForTesting()
+        super.tearDown()
+    }
+
+    func testToggleAndNormalize() {
+        let store = GeohashBookmarksStore.shared
+        // Start clean
+        XCTAssertTrue(store.bookmarks.isEmpty)
+
+        // Add with mixed case and hash prefix
+        store.toggle("#U4PRUY")
+        XCTAssertTrue(store.isBookmarked("u4pruy"))
+        XCTAssertEqual(store.bookmarks.first, "u4pruy")
+
+        // Toggling again removes
+        store.toggle("u4pruy")
+        XCTAssertFalse(store.isBookmarked("u4pruy"))
+        XCTAssertTrue(store.bookmarks.isEmpty)
+    }
+
+    func testPersistenceWritten() throws {
+        let store = GeohashBookmarksStore.shared
+        store.toggle("ezs42")
+        store.toggle("u4pruy")
+
+        // Verify persisted JSON contains both (order not enforced here)
+        guard let data = UserDefaults.standard.data(forKey: storeKey) else {
+            XCTFail("No persisted data found")
+            return
+        }
+        let arr = try JSONDecoder().decode([String].self, from: data)
+        XCTAssertTrue(arr.contains("ezs42"))
+        XCTAssertTrue(arr.contains("u4pruy"))
+    }
+}