Bitchat Introduction

Introducing Bitchat: Decentralized Offline Messaging via Bluetooth Mesh

Bitchat redefines resilient communication by eliminating dependence on infrastructure. Built as a permissionless, serverless messaging protocol, it leverages Bluetooth Low Energy (BLE) mesh networking to enable real-time, multi-hop conversations—entirely offline. Conceived as “the side-groupchat” for the post-internet era, Bitchat requires no accounts, no phone numbers, and no internet connection. Instead, devices discover each other autonomously, form ad-hoc mesh topologies, and relay messages across up to seven hops—making it uniquely suited for remote deployments, disaster response, civil coordination, and privacy-first environments.

Getting Started with Bitchat

Installation is streamlined: download the official iOS app (iOS 16.0+) or Android APK (v1.1.6), or build from source using the public GitHub repository. On first launch, choose a nickname—no registration required—and Bitchat immediately begins scanning for nearby peers via BLE advertising. Join public channels with IRC-style commands like /j #rescue, list active channels with /channels, or initiate private chats using /m @friend Hello. Channel admins can set passwords (/pass secret), assign moderators, and even transfer ownership—all without central coordination. Messages propagate intelligently through the mesh, respecting TTL limits and avoiding loops via cryptographic message IDs and bloom-filter deduplication.

Bluetooth LE Mesh Architecture (Automatic peer discovery, TTL-limited multi-hop routing, adaptive topology management)

End-to-End Cryptographic Assurance (X25519 key exchange, AES-256-GCM encryption for messages and channels, Ed25519 signatures, forward secrecy, cover traffic obfuscation)

IRC-Native Interaction Layer (Channel topics, password protection, role-based permissions, inline mentions, command-driven moderation)

Intelligent Store-and-Forward (Ephemeral by default; optional persistent caching with automatic redelivery upon peer reconnection)

Zero-Identity Design (No identifiers beyond public keys; no metadata collection; no persistent storage unless explicitly enabled)

Cross-Platform Native Implementation (iOS, macOS, Android—with consistent protocol behavior and interoperability)

LZ4 Message Compression (Dynamically applied to reduce BLE packet overhead by 30–70%, preserving bandwidth and latency)

Adaptive Power Intelligence (Five-tier battery profile: Performance → Balanced → Power Saver → Ultra-Low → Deep Sleep, with configurable scan intervals and duty cycling)

One-Tap Emergency Privacy (Triple-tap the logo to trigger instant, cryptographically verified data wipe)

Public Domain & Open Protocol (No copyright restrictions; fully auditable; designed for integration, extension, and hardware portability)