Появился Bitchat — мессенджер, которому не нужен интернет или вышки связи! 🔋💬 Он передаёт сообщения через Bluetooth mesh-сети: твой телефон становится «ретранслятором», цепляя соседние устройства. Идеально для фестивалей, ЧС или мест с плохим покрытием. Без серверов, шифрование, полный оффлайн-режим. Технология не нова, но реализация — огонь! 🔥 Когда уже добавим в тревожный рюкзак? #децентрализация #bluetooth #mesh
- bitchat
- A secure, decentralized, peer-to-peer messaging app that works over Bluetooth mesh networks. No internet required, no servers, no phone numbers — just pure encrypted communication.
- License
- This project is released into the public domain. See the
- LICENSE
- file for details.
- Features
- Decentralized Mesh Network
- Automatic peer discovery and multi-hop message relay over Bluetooth LE End-to-End Encryption
- X25519 key exchange + AES-256-GCM for private messages Room-Based Chats
- Topic-based group messaging with optional password protection Store & Forward
- Messages cached for offline peers and delivered when they reconnect Privacy First
- No accounts, no phone numbers, no persistent identifiers IRC-Style Commands
- Familiar /join , /msg , /who style interface Message Retention
- Optional room-wide message saving controlled by room owners Universal App
- Native support for iOS and macOS Cover Traffic
- Timing obfuscation and dummy messages for enhanced privacy Emergency Wipe
- Triple-tap to instantly clear all data Performance Optimizations
- LZ4 message compression, adaptive battery modes, and optimized networking Setup Option 1: Using XcodeGen (Recommended) Install XcodeGen if you haven’t already: brew install xcodegen Generate the Xcode project: cd bitchat xcodegen generate Open the generated project: open bitchat.xcodeproj Option 2: Using Swift Package Manager Open the project in Xcode: cd bitchat open Package.swift Select your target device and run Option 3: Manual Xcode Project Open Xcode and create a new iOS/macOS App Copy all Swift files from the bitchat directory into your project Update Info.plist with Bluetooth permissions Set deployment target to iOS 16.0 / macOS 13.0 Usage Basic Commands /j #room — Join or create a room /m @user message — Send a private message /w — List online users /rooms — Show all discovered rooms /clear — Clear chat messages /pass [password] — Set/change room password (owner only) /transfer @user — Transfer room ownership /save — Toggle message retention for room (owner only) Getting Started Launch bitchat on your device Set your nickname (or use the auto-generated one) You’ll automatically connect to nearby peers Join a room with /j #general or start chatting in public Messages relay through the mesh network to reach distant peers Room Features Password Protection
- Room owners can set passwords with /pass Message Retention
- Owners can enable mandatory message saving with /save @ Mentions
- Use @nickname to mention users (with autocomplete) Ownership Transfer
- Pass control to trusted users with /transfer Security & Privacy Encryption Private Messages
- X25519 key exchange + AES-256-GCM encryption Room Messages
- Argon2id password derivation + AES-256-GCM Digital Signatures
- Ed25519 for message authenticity Forward Secrecy
- New key pairs generated each session Privacy Features No Registration
- No accounts, emails, or phone numbers required Ephemeral by Default
- Messages exist only in device memory Cover Traffic
- Random delays and dummy messages prevent traffic analysis Emergency Wipe
- Triple-tap logo to instantly clear all data Local-First
- Works completely offline, no servers involved Performance & Efficiency Message Compression LZ4 Compression
- Automatic compression for messages >100 bytes 30-70% bandwidth savings on typical text messages Smart compression
- Skips already-compressed data Battery Optimization Adaptive Power Modes
- Automatically adjusts based on battery level Performance mode: Full features when charging or >60% battery Balanced mode: Default operation (30-60% battery) Power saver: Reduced scanning when <30% battery Ultra-low power: Emergency mode when <10% battery Background efficiency
- Automatic power saving when app backgrounded Configurable scanning
- Duty cycle adapts to battery state Network Efficiency Optimized Bloom filters
- Faster duplicate detection with less memory Message aggregation
- Batches small messages to reduce transmissions Adaptive connection limits
- Adjusts peer connections based on power mode Technical Architecture Binary Protocol bitchat uses an efficient binary protocol optimized for Bluetooth LE: Compact packet format with 1-byte type field TTL-based message routing (max 7 hops) Automatic fragmentation for large messages Message deduplication via unique IDs Mesh Networking Each device acts as both client and peripheral Automatic peer discovery and connection management Store-and-forward for offline message delivery Adaptive duty cycling for battery optimization For detailed protocol documentation, see the Technical Whitepaper . Building for Production Set your development team in project settings Configure code signing Archive and distribute through App Store or TestFlight Android Compatibility The protocol is designed to be platform-agnostic. An Android client can be built using: Bluetooth LE APIs Same packet structure and encryption Compatible service/characteristic UUIDs
