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Introduction to AT Protocol
Walkthrough of the various parts and concepts in Bluesky's AT Protocol (ATProto), the types of servers involved and how it all fits together
Records are stored on disk and transferred between servers in a binary format called CBOR, although in most API endpoints they’re returned in a JSON form (they are equivalent, just different encodings of the same data). bsky.social was left as a so-called “ entryway server ”, which handles shared authentication for all Bluesky-hosted PDSes (it’s a private piece of Bluesky PBC infrastructure that’s not open source and not needed for independent PDS hosters). An alternative full-network Bluesky AppView that is used by a few thousands of users shouldn’t be very hard to run, but to be able to serve millions, you’ll need a lot of hardware and something more custom than the Postgres-based version.
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