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)
Cryptography
Cryptographic systems, curves, and key types used in AT Protocol
Data Model
Consistent data encoding for records and messages.
Lexicon
A schema definition language.
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
com.atproto.admin
ATP Lexicon - Admin Schemas
com.atproto.identity
ATP Lexicon - Identity Schemas
com.atproto.label
ATP Lexicon - Label Schemas
com.atproto.moderation
ATP Lexicon - Moderation Schemas
com.atproto.repo
ATP Lexicon - Repo Schemas
com.atproto.server
ATP Lexicon - Server Schemas
com.atproto.sync
ATP Lexicon - Sync Schemas
app.bsky.actor
Bluesky Lexicon - Actor Schemas
app.bsky.embed
Bluesky Lexicon - Embed Schemas
app.bsky.feed
Bluesky Lexicon - Feed Schemas
app.bsky.graph
Bluesky Lexicon - Graph Schemas
app.bsky.notification
Bluesky Lexicon - Notification Schemas
app.bsky.richtext
Bluesky Lexicon - Richtext Schemas