AT Protocol services

The AT Protocol, or Authenticated Transfer Protocol, is an open and decentralized network for building social applications known as the ATmosphere. It differs from ActivityPub and its Fediverse in key aspects, and has given rise to various applications such as Bluesky for microblogging, BLUECAST for real-time audio streaming, and WhiteWind for blogging. The AT Protocol allows for integration with other platforms, including Twitter and the Fediverse, through tools like Sky Follower Bridge and Bridgy Fed. ActivityPub plans to adopt some aspects of ATProto, including discoverability and account portability, in its future development.