diff --git a/bitchat/Nostr/GeoRelayDirectory.swift b/bitchat/Nostr/GeoRelayDirectory.swift
index 8151f952..15e73dd2 100644
--- a/bitchat/Nostr/GeoRelayDirectory.swift
+++ b/bitchat/Nostr/GeoRelayDirectory.swift
@@ -14,7 +14,7 @@ final class GeoRelayDirectory {
     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 = 60 * 60 * 24 // 24h
+    private let fetchInterval: TimeInterval = TransportConfig.geoRelayFetchIntervalSeconds // 24h
 
     private init() {
         // Load cached or bundled data synchronously
diff --git a/bitchat/Nostr/NostrRelayManager.swift b/bitchat/Nostr/NostrRelayManager.swift
index d4734eee..69d2f2e1 100644
--- a/bitchat/Nostr/NostrRelayManager.swift
+++ b/bitchat/Nostr/NostrRelayManager.swift
@@ -48,10 +48,10 @@ class NostrRelayManager: ObservableObject {
     private let messageQueueLock = NSLock()
     
     // Exponential backoff configuration
-    private let initialBackoffInterval: TimeInterval = 1.0  // Start with 1 second
-    private let maxBackoffInterval: TimeInterval = 300.0    // Max 5 minutes
-    private let backoffMultiplier: Double = 2.0            // Double each time
-    private let maxReconnectAttempts = 10                  // Stop after 10 attempts
+    private let initialBackoffInterval: TimeInterval = TransportConfig.nostrRelayInitialBackoffSeconds
+    private let maxBackoffInterval: TimeInterval = TransportConfig.nostrRelayMaxBackoffSeconds
+    private let backoffMultiplier: Double = TransportConfig.nostrRelayBackoffMultiplier
+    private let maxReconnectAttempts = TransportConfig.nostrRelayMaxReconnectAttempts
     
     // Reconnection timer
     private var reconnectionTimer: Timer?
@@ -568,7 +568,7 @@ struct NostrFilter: Encodable {
         filter.kinds = [1059] // Gift wrap kind
         filter.since = since?.timeIntervalSince1970.toInt()
         filter.tagFilters = ["p": [pubkey]]
-        filter.limit = 100 // Add a reasonable limit
+        filter.limit = TransportConfig.nostrRelayDefaultFetchLimit // reasonable limit
         return filter
     }
 
diff --git a/bitchat/Services/TransportConfig.swift b/bitchat/Services/TransportConfig.swift
index fa22f5c9..f5e69f17 100644
--- a/bitchat/Services/TransportConfig.swift
+++ b/bitchat/Services/TransportConfig.swift
@@ -57,4 +57,24 @@ enum TransportConfig {
     static let nostrGeohashInitialLookbackSeconds: TimeInterval = 3600
     static let nostrGeohashInitialLimit: Int = 200
     static let nostrGeoRelayCount: Int = 5
+
+    // Compression
+    static let compressionThresholdBytes: Int = 100
+
+    // Message deduplication
+    static let messageDedupMaxAgeSeconds: TimeInterval = 300
+    static let messageDedupMaxCount: Int = 1000
+
+    // Verification QR
+    static let verificationQRMaxAgeSeconds: TimeInterval = 5 * 60
+
+    // Nostr relay backoff
+    static let nostrRelayInitialBackoffSeconds: TimeInterval = 1.0
+    static let nostrRelayMaxBackoffSeconds: TimeInterval = 300.0
+    static let nostrRelayBackoffMultiplier: Double = 2.0
+    static let nostrRelayMaxReconnectAttempts: Int = 10
+    static let nostrRelayDefaultFetchLimit: Int = 100
+
+    // Geo relay directory
+    static let geoRelayFetchIntervalSeconds: TimeInterval = 60 * 60 * 24
 }
diff --git a/bitchat/Services/VerificationService.swift b/bitchat/Services/VerificationService.swift
index 56b4caeb..2a69fbb7 100644
--- a/bitchat/Services/VerificationService.swift
+++ b/bitchat/Services/VerificationService.swift
@@ -102,7 +102,7 @@ final class VerificationService {
     }
 
     /// Verify a scanned QR and return the parsed payload if valid (signature + freshness checks)
-    func verifyScannedQR(_ urlString: String, maxAge: TimeInterval = 5 * 60) -> VerificationQR? {
+    func verifyScannedQR(_ urlString: String, maxAge: TimeInterval = TransportConfig.verificationQRMaxAgeSeconds) -> VerificationQR? {
         guard let url = URL(string: urlString), let qr = VerificationQR.fromURL(url) else { return nil }
         // Freshness
         let now = Date().timeIntervalSince1970
diff --git a/bitchat/Utils/CompressionUtil.swift b/bitchat/Utils/CompressionUtil.swift
index ccbbb0d9..883fdaa8 100644
--- a/bitchat/Utils/CompressionUtil.swift
+++ b/bitchat/Utils/CompressionUtil.swift
@@ -11,7 +11,7 @@ import Compression
 
 struct CompressionUtil {
     // Compression threshold - don't compress if data is smaller than this
-    static let compressionThreshold = 100 // bytes
+    static let compressionThreshold = TransportConfig.compressionThresholdBytes // bytes
     
     // Compress data using zlib algorithm (most compatible)
     static func compress(_ data: Data) -> Data? {
diff --git a/bitchat/Utils/MessageDeduplicator.swift b/bitchat/Utils/MessageDeduplicator.swift
index c5fc701a..6c067466 100644
--- a/bitchat/Utils/MessageDeduplicator.swift
+++ b/bitchat/Utils/MessageDeduplicator.swift
@@ -11,8 +11,8 @@ final class MessageDeduplicator {
     private var entries: [Entry] = []
     private var lookup = Set<String>()
     private let lock = NSLock()
-    private let maxAge: TimeInterval = 300  // 5 minutes
-    private let maxCount = 1000
+    private let maxAge: TimeInterval = TransportConfig.messageDedupMaxAgeSeconds  // 5 minutes
+    private let maxCount = TransportConfig.messageDedupMaxCount
 
     /// Check if message is duplicate and add if not
     func isDuplicate(_ messageID: String) -> Bool {
@@ -84,4 +84,3 @@ final class MessageDeduplicator {
         }
     }
 }
-