🔍 Bitchat What is it? • Decentralized, serverless: using Bluetooth Low Energy (BLE) mesh Technology forms a peer-to-peer network between mobile phones without the need for SIM、Wi‑Fi Or a network server. • Supports multiple platforms: iOS Tested version passed TestFlight，Android permeable GitHub APK Side loading installation, macOS The version is also under development. ⸻ 🔐 Privacy and Encryption • End to end encryption • Private Chat Usage Curve25519   (X25519 key exchange)+  AES‑GCM Add group information Argon2id Derived keys and AES‑256‑GCM encryption • Strengthen anonymity • Temporary generated every time it starts Peer ID， No registration, phone or email required Intelligent masking mechanism: dummy messages and timing obfuscation can hide true communication behavior One click "Panic Mode" triple tap LOGO All local data can be cleared ⸻ ⛓ Network and functional characteristics Relay forwarding: Information can be relayed by multiple nearby mobile phones, covering a distance of over 300 meters m。 • Chat rooms and favorites: support IRC Chat rooms, password protected channels, mention functions, favorites for receiving messages later Offline Bitcoin transactions: capable of generating and signing BTC Trading, through mesh Transferred to devices with network access, and then pushed to the Bitcoin network - creating a new scenario for offline payments ⸻ 🧰 Usage scenario 1. Natural disasters&network interruptions: During disasters, if there is no signal on the phone, it can still be used for emergency communication and coordination 2. Large scale events or protests: Network congestion due to dense crowds, Bitchat Can provide local network communication 3. Review avoidance: In areas with restricted internet access, anonymous chat and information sharing can be maintained 4. Outdoor adventure: Communication can still be achieved in scenarios with poor network coverage such as camping and hiking ⸻ 🧪 Behind the scenes technology and development • Rapid development AI Assistance:@ jack It means to complete the prototype in about two days over the weekend, using our own resources AI Programming Assistant Goose Assist in development Open source white paper: GitHub There is a technical white paper on it, which explains the protocol architecture and security design, and also publishes it Beta Privacy and identity security vulnerability risks Competitors and technological heritage: such as FireChat、Bridgefy Used in protest scenes, but with weak security, Bitchat Focusing on encryption, anonymity, and UX improve 👀 Bitchat It is an offline network chat tool that is decentralized and has strong privacy BLE mesh Based on this, modern encryption (Curve25519+AES-GCM), anonymity mechanism, multi device broadcast, group chat, bookmarking, emergency erasure and other features are introduced. Its goal is to create a network that can maintain communication, avoid censorship, and even facilitate mutual signing in extreme scenarios, truly implementing the concept of 'offline is functionality'. It combines practical functions with innovation, and is a new opportunity for future disaster relief, democratic movements, outdoor activities, and rural connectivity.