Bitchat: The Offline BLE Mesh Chat Developed by Jack Dorsey
In early July 2025, Jack Dorsey, CEO of Block (formerly Square) and co-founder of Twitter, announced "Bitchat," a new app that utilizes Bluetooth mesh networking, as a private project he worked on over the weekend. This article provides an easy-to-understand explanation of Bitchat's technical features, its relationship to existing apps, Dorsey's philosophical background, and future prospects, incorporating specific examples and quotes.
1. What is Bitchat?
1-1. How Bluetooth Mesh Communication Works
Bitchat utilizes Bluetooth Low Energy (BLE) to form a "mesh network" where users' smartphones autonomously relay messages to each other as nodes. While Bluetooth typically has a communication range of about 30m, this is extended to a maximum of 300m (approximately 984 feet) through message relaying (multi-hop) between devices.
1-2. Fully Offline & Encrypted Chat
It does not require the internet or cellular networks, and functions in environments where communication infrastructure is limited, such as during disasters, at festivals, or at protest demonstrations.
Messages are end-to-end encrypted and are not stored on a central server, but are held only temporarily within the devices.
No personal information such as account registration, phone numbers, or email addresses is required at all.
2. Technical Details and Design Philosophy
2-1. Store and Forward
Bitchat is equipped with a mechanism that holds messages even when network participants are temporarily offline, and sends them upon reconnection. Large messages are automatically split into 500-byte fragments and relayed efficiently.
2-2. IRC-style Chat Structure
As Dorsey described it as having "IRC vibes," group chats use rooms with hashtags, and password settings are also optionally available.
2-3. Power-saving Design and Connection Management
Leveraging the energy-saving characteristics of BLE, the design controls scan frequency and the number of connections to suppress battery consumption even when running in the background.
3. Comparison with Preceding Mesh Chats
3-1. Similarities and Differences with Bridgefy
Bridgefy gained attention during the 2019 Hong Kong protests and introduced BLE mesh + Signal protocol (encryption).
While both share the ability to operate offline and provide encrypted communication, Bitchat is characterized by a richer design, such as store-and-forward functionality and IRC-style chat rooms.
3-2. Relationship with FireChat
FireChat, which became a hot topic around 2014, also adopted mesh communication via BLE and multi-hop, but it ceased operations. Bitchat is more sophisticated, equipped with modern encryption technology and network control mechanisms.
4. Dorsey's Background and Philosophy
4-1. The "Protocol-First" Philosophy
Since founding Twitter, Dorsey has continued to focus on decentralized protocols such as Bluesky and Damus. Bitchat is an extension of this, representing an attempt to realize a messaging protocol that eliminates centralization.
4-2. As a Cypherpunk and Bitcoin Supporter
He takes a cypherpunk stance that emphasizes thorough respect for privacy and censorship avoidance, and he is also a Bitcoin believer. Bitchat aligns with the philosophy of "establishing censorship-resistant communication."
5. Current Status and Future Outlook
5-1. Beta Testing Status
The beta test via Apple TestFlight reached its 10,000-user capacity on the same day it was released and was subsequently closed. It is currently under review, and an official release date has not yet been determined.
5-2. Application Scenarios
Communication in crowded environments such as music festivals and sporting events
Emergency communication networks during natural disasters or crises
Protest activities under censorship or communication restrictions
In the future, expansion to Wi-Fi hybrids and the introduction of voice calling (VoIP) features are also anticipated.
Technically, Bitchat integrates multiple advanced features such as "BLE mesh," "end-to-end encryption," "store-and-forward," "IRC-style chat structure," and "power-saving design," embodying Dorsey's philosophy of "protocol-first" and "censorship-resistant" communication. We look forward to further refinements in technology, UX, and operations leading up to the official release. It is necessary to continue monitoring its potential and challenges while comparing it with similar technologies.
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