The AT Protocol (Authenticated Transfer Protocol, pronounced "@ protocol" and commonly shortened to ATProto) is a protocol and open standard for distributed social networking services. It is under development by Bluesky Social PBC, a public benefit corporation originally created as an independent research group within Twitter to investigate the possibility of decentralizing the service.
The AT Protocol aims to address perceived issues with other decentralized protocols, such as user experience, platform interoperability, discoverability, network scalability, and portability of user data and social graphs. It employs a modular microservice architecture and a federated, server-agnostic user identity to enable movement between protocol services, with the goal of providing an integrated online experience. Platforms can access and serve any user content within the network by fetching content formatted as predefined data schemas from federated network-wide data streams.
The AT Protocol powers the Bluesky social network, which was created as a proof of concept for the protocol, and is the main service in an ecosystem of platforms and services built on...
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