Jack Dorsey’s Game-Changing Bluetooth Mesh Messaging App
Jack Dorsey has a new endeavor BitChat
Co‑founder of Twitter and former CEO, has quietly launched Bitchat, a groundbreaking offline-first messaging app that operates via Bluetooth mesh networks.
Bitchat leverages Bluetooth Low Energy (BLE) mesh to create an ad hoc communication network, enabling encrypted peer-to-peer chats without internet, cellular, Wi‑Fi, or central servers. Users can form decentralized chat rooms and private channels that operate within ~30 m per hop and can extend up to ~300 m via multi-hop relays .
Was BitChat Entirely Vibecoded?
BitChat’s development embodies a "vibecoded" ethos, prioritizing simplicity, resilience, and user sovereignty in its design. Built from the ground up to operate without internet or server dependencies, it uses Bluetooth Low Energy (BLE) mesh for robust, decentralized communication. While not explicitly open-sourced yet, its architecture aligns with privacy-first, permissionless principles championed by Jack Dorsey, as seen in projects like Bitcoin and Bluesky.
What does Jack Dorsey's Bitchat do ?
It enables secure, encrypted peer-to-peer communication without relying on internet, cellular, Wi-Fi, or central servers. By leveraging BLE mesh, BitChat allows users to create decentralized chat rooms and private channels within a range of approximately 30 meters per hop, extendable to 300 meters through multi-hop relays, making it ideal for scenarios like festivals, protests, or disaster zones where traditional connectivity may be unavailable.
BitChat Is Fully Offline & Mesh-Relayed Encrypted Communication
- Internet‑free resilience: Bitchat enables offline Bluetooth mesh messaging, perfect for festival crowds, protests, remote camps, or disaster zones.
- Multi-hop mesh network: Devices automatically relay messages to peers, creating a decentralized network that expands the usable range to nearly 300 m .
- End-to-end encryption & ephemeral messaging: All texts are encrypted using X25519 and AES‑256‑GCM, reside only in device memory by default, and vanish when no longer needed
No Accounts, No Metadata, No Middlemen, Just Bitchat.
What is Jack Dorsey's Bitchat Use Cases ?
Festivals and Remote Events
Imagine a music festival with no cell reception but hundreds of attendees—Bitchat turns that into a Bluetooth mesh jackpot, enabling coordination, finder messaging ("I’m by main stage"), or group chat for friends.
Protests, Occupy Movements & Emergency Zones
No internet? No problem. Officers might attempt to shut down infrastructure, but Bitchat’s peer-to-peer jackpot resilience keeps communications flowing—and encrypted—with no central point of control.
Disaster Relief & Off-Grid Communities
After earthquakes or hurricanes, infrastructure can get wiped. A Bitchat mesh network becomes a communication jackpot for field responders, survivors, and volunteers—even in remote shelters or relief sites.
Architecture Deep Dive: How Bitchat Works
Bitchat operates on a decentralized Bluetooth Low Energy (BLE) mesh network, leveraging the Bluetooth SIG’s mesh specification (2017) to enable many-to-many communication without internet or servers. Each device acts as both a client and peripheral, forming a self-organizing mesh where messages are relayed hop-by-hop, extending the range from ~30 meters per hop to ~300 meters via up to seven hops with a Time-To-Live (TTL) mechanism. Messages are fragmented into 500-byte chunks, encrypted using X25519 key exchange and AES-256-GCM, and stored ephemerally in device memory, ensuring no persistent logs. The store-and-forward model caches messages for offline peers, with privacy enhancements like dummy traffic and a triple-tap logo "panic mode" for instant data wipe.
Bitchat is currently in beta, available via Apple’s TestFlight (capped at 10,000 users) and Android APK on GitHub, with full public release pending battery optimization and relay stability improvements. For technical details, see the Bitchat whitepaper on GitHub and Bluetooth Mesh specifications.
The Bitchat whitepaper can be found on GitHub at the following link:
https://github.com/permissionlesstech/bitchat/blob/main/WHITEPAPER.md.
my weekend project to learn about bluetooth mesh networks, relays and store and forward models, message encryption models, and a few other things.
— jack (@jack) July 6, 2025
bitchat: bluetooth mesh chat...IRC vibes.
TestFlight: https://t.co/P5zRRX0TB3
GitHub: https://t.co/Yphb3Izm0P pic.twitter.com/yxZxiMfMH2


