Berty is a peer-to-peer messaging application and framework designed for decentralized private messaging. It utilizes a distributed identity protocol and a decentralized database to enable end-to-end encrypted communication without relying on central servers, phone numbers, or email addresses.
The project distinguishes itself through an offline messaging framework that uses Bluetooth Low Energy and multicast DNS for local device discovery. This allows peers to establish direct connections and exchange messages without internet or cellular data, using QR codes for secure contact exchange.
The system provides a comprehensive peer-to-peer application SDK and framework for building decentralized apps with integrated encryption and network routing. Its operational surface includes a background network daemon, a command line interface for node administration, and tools for network performance monitoring and high-volume usage simulation.