Jack Dorsey, co-founder of Twitter and CEO of Block, has launched Bitchat, a messaging application that operates independently of the internet or mobile networks, using Bluetooth mesh networking for secure and anonymous communication. The app, currently in beta testing, does not require phone numbers, email addresses, or user accounts, allowing encrypted messages to be transmitted directly between nearby devices. Messages are end-to-end encrypted and disappear by default, with no data stored on a central server. Bitchat also features group chat rooms, mentions using @handles, and password-protected conversations. A store-and-forward mechanism allows messages to be saved and delivered later. Dorsey plans to integrate Wi-Fi Direct support to enhance communication range and speed. The whitepaper discusses potential use cases for Bitchat, including disaster response and community coordination.