Private, serverless messaging — no accounts, no internet required. Zemzeme is a fork of bitchat (v1.7.0) for Android, extended with a second internet-capable transport layer built on libp2p. It supports three independent communication methods that can operate simultaneously: offline Bluetooth mesh, direct peer-to-peer over the internet (via libp2p + ICE), and relay-based messaging via the Nostr protocol. All messages are end-to-end encrypted. No registration, no phone number, no central server. Features Messaging Text messages with formatting and @mention support Voice notes (compressed audio) Image and file sharing (chunked binary transfer) Read receipts and delivery indicators Password-protected channels Transport Layers Layer Medium Internet Required BLE Mesh Bluetooth LE No P2P / ICE Wi-Fi / Mobile Yes Nostr Wi-Fi / Mobile (relay) Yes All three layers operate simultaneously; the app routes messages through whichever paths are available and falls back automatically. Location & Channels Geohash-based public channels (city → country granularity) Custom named group chats Geographic group auto-discovery Security Noise Protocol (Noise_NK, Curve25519 + ChaCha20-Poly1305) for all peer sessions Ed25519 signed QR codes for peer identity verification BouncyCastle PBKDF2 PIN hashing EncryptedSharedPreferences (AES-256-GCM) for all local secrets Biometric + PIN app lock (optional) No GPS coordinates transmitted — only coarse geohash Privacy No account or phone number required Zero central server; all state is local or peer-to-peer BLE mesh relays use hop-by-hop encryption Tor integration (optional, in progress)