Jack Dorsey made an encrypted Bluetooth messaging app
Briefly

Bitchat is a new messaging app launched by Jack Dorsey that enables peer-to-peer communication via Bluetooth. It operates entirely without internet or cellular service, relying on Bluetooth Low Energy mesh networks to send encrypted messages. The app has no accounts or servers, ensuring user privacy with features like password-protected channels and a 'Panic Mode' for data clearance. Bitchat boasts a messaging range exceeding 300 meters and aims to assist in resilient communication amidst centralized infrastructure challenges. The app is currently available for beta testing, but capacity is full as review for wider release continues.
"Bitchat addresses the need for resilient, private communication that doesn't depend on centralized infrastructure. By leveraging Bluetooth Low Energy mesh networking, Bitchat enables direct peer-to-peer messaging within physical proximity, with automatic message relay extending the effective range beyond direct Bluetooth connections."
"Images of the app posted by Dorsey also show that Bitchat operates without accounts, servers, or data collection, and includes privacy features like password-protected channels and a 'Panic Mode' that instantly clears all data when the logo is triple-tapped."
Read at The Verge
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