Bitchat

Bitchat is a peer-to-peer encrypted messaging app developed by Jack Dorsey, co‑founder of Twitter (now X) and Block, Inc. Announced in July 2025, Bitchat enables users to send messages via Bluetooth Low Energy (BLE) mesh networks without requiring internet connections, cellular service, user accounts, or central servers. Bitchat also uses the internet-based Nostr protocol for global reach.

== Overview == Bitchat uses a hybrid peer-to-peer encrypted messaging architecture, with two complementary transport layers of Bluetooth mesh networking and Nostr for offline and internet communication. It operates local messaging over Bluetooth based on the Noise Protocol Framework, enabling nearby devices to relay messages without requiring internet connectivity. Users can chat on the local #mesh channel, and since version 1.3.0, Geohash-based location channels are available via Nostr, allowing online users to chat with nearby or global people. Direct messages to other users use end-to-end encryption, with Bluetooth preferred first and Nostr being the fallback routing when Bluetooth is unavailable. Furthermore, the app features a panic mode that erases all stored data upon three taps of the logo. Jack Dorsey has said the app resembles IRC messaging systems.