Guides
Protocol Overview Start here
An introduction to the AT Protocol.
Identity
How the AT Protocol handles user identity.
Data Repositories
A guide to the AT Protocol repo structure.
Lexicon
A schema-driven interoperability framework
Applications
How applications work on the AT Protocol.
FAQ
Frequently Asked Questions about ATP
Specs
AT Protocol
Specification for the Authenticated Transfer Protocol (AT Protocol)
Data Model
Consistent data encoding for records and messages.
Lexicon
A schema definition language.
Cryptography
Cryptographic systems, curves, and key types used in AT Protocol
Repository
Self-authenticating storage for public account content
HTTP API (XRPC)
Cross-system queries and procedures over HTTP
Event Stream
Network wire protocol for subscribing to a stream of Lexicon objects
DID
Persistent decentralized identifiers (as used in atproto)
Handle
A specification for human-friendly account identifiers.
NSID
A specification for global semantic IDs.
Record Key
Identifier for individual records in a collection
URI Scheme
A URI scheme for addressing ATP repository data.
Lexicons
app.bsky
app.bsky Lexicons
com.atproto
com.atproto Lexicons