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AT Protocol - AT Protocol
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pl-2"><div class="absolute inset-x-0 top-0 bg-zinc-800/2.5 will-change-transform dark:bg-white/2.5" style="border-radius:8px;height:32px;top:0;opacity:0"></div><div class="absolute inset-y-0 left-2 w-px bg-zinc-900/10 dark:bg-white/5"></div><div class="absolute left-2 h-6 w-px bg-blue-500" style="top:4px;opacity:1"></div><ul role="list" class="border-l border-transparent"><li class="relative"><a aria-current="page" class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-900 dark:text-white" href="/specs/atp"><span class="truncate">AT Protocol</span></a><ul role="list" style="opacity:1"><li><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-7 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/atp#protocol-structure"><span class="truncate">Protocol Structure</span></a></li><li><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-7 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/atp#protocol-extension-and-applications"><span class="truncate">Protocol Extension and Applications</span></a></li><li><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-7 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/atp#what-is-missing"><span class="truncate">What Is Missing?</span></a></li><li><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-7 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/atp#future-work"><span class="truncate">Future Work</span></a></li></ul></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/data-model"><span class="truncate">Data Model</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/lexicon"><span class="truncate">Lexicon</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/cryptography"><span class="truncate">Cryptography</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/repository"><span class="truncate">Repository</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/blob"><span class="truncate">Blobs</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/label"><span class="truncate">Labels</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/xrpc"><span class="truncate">HTTP API (XRPC)</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/oauth"><span class="truncate">OAuth</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/event-stream"><span class="truncate">Event Stream</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/did"><span class="truncate">DID</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/handle"><span class="truncate">Handle</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/nsid"><span class="truncate">NSID</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/record-key"><span class="truncate">Record Key</span></a></li><li class="relative"><a class="flex justify-between gap-2 py-1 pr-3 text-sm transition pl-4 text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-white" href="/specs/at-uri-scheme"><span class="truncate">URI Scheme</span></a></li></ul></div></li></ul></nav></div></header><div class="relative flex h-full flex-col px-4 pt-14 sm:px-6 lg:px-8"><main class="flex-auto"><article class="flex h-full flex-col pb-24 pt-16"><div class="flex-auto prose dark:prose-invert [html_:where(&>*)]:mx-auto [html_:where(&>*)]:max-w-2xl [html_:where(&>*)]:lg:mx-[calc(50%-min(50%,theme(maxWidth.lg)))] [html_:where(&>*)]:lg:max-w-3xl"><h1>AT Protocol</h1> <p class="lead">The Authenticated Transfer Protocol (AT Protocol or atproto) is a generic federated protocol for building open social media applications. Some recurring themes and features are:</p> <ul> <li class="lead">Self-authenticating data and identity, allowing seamless account migrations and redistribution of content</li> <li class="lead">Design for "big world" use cases, scaling to billions of accounts</li> <li class="lead">Delegated authority over application-layer schemas and aggregation infrastructure</li> <li class="lead">Re-use of existing data models from the dweb protocol family and network primitives from the web platform</li> </ul> <h2 class="scroll-mt-24" id="protocol-structure"><a class="group text-inherit no-underline hover:text-inherit" href="#protocol-structure">Protocol Structure</a></h2> <p><strong>Identity:</strong> account control is rooted in stable <a href="/specs/did">DID</a> identifiers, which can be rapidly resolved to determine the current service provider location and <a href="/specs/cryptography">Cryptographic keys</a> associated with the account. <a href="/specs/handle">Handles</a> provide a more human-recognizable and mutable identifier for accounts.</p> <p><strong>Data:</strong> public content is stored in content-addressed and cryptographically verifiable <a href="/specs/repository">Repositories</a>. Data records and network messages all conform to a unified <a href="/specs/data-model">Data Model</a> (with <a href="https://en.wikipedia.org/wiki/CBOR">CBOR</a> and JSON representations). <a href="/specs/label">Labels</a> are a separate lightweight form of metadata, individually signed and distributed outside repositories.</p> <p><strong>Network:</strong> HTTP client-server and server-server <a href="/specs/xrpc">APIs</a> are described with Lexicons, as are WebSocket <a href="/specs/event-stream">Event Streams</a>. Individual records can be referenced across the network by <a href="/specs/at-uri-scheme">AT URI</a>. A Personal Data Server (PDS) acts as an account's trusted agent in the network, routes client network requests, and hosts repositories. A relay (previously referred to as a Big Graph Service, or BGS) crawls many repositories and outputs a unified event firehose.</p> <p><strong>Application:</strong> APIs and record schemas for applications built on atproto are specified in <a href="/specs/lexicon">Lexicons</a>, which are referenced by <a href="/specs/nsid">Namespaced Identifiers</a> (NSIDs). Application-specific aggregations (such as search) are provided by an Application View (App View) service. Clients can include mobile apps, desktop software, or web interfaces.</p> <p>The AT Protocol itself does not specify common social media conventions like follows or avatars, leaving these to application-level Lexicons. The <code>com.atproto.*</code> Lexicons provide common APIs for things like account signup and login. These could be considered part of AT Protocol itself, though they can also be extended or replaced over time as needed. Bluesky is a microblogging social app built on top of AT Protocol, with lexicons under the <code>app.bsky.*</code> namespace.</p> <p>While atproto borrows several formats and specifications from the IPFS ecosystem (such as <a href="https://ipld.io/">IPLD</a> and <a href="https://github.com/multiformats/cid">CID</a>), atproto data does not need to be stored in the IPFS network, and the atproto reference implementation does not use the IPFS network at all.</p> <h2 class="scroll-mt-24" id="protocol-extension-and-applications"><a class="group text-inherit no-underline hover:text-inherit" href="#protocol-extension-and-applications">Protocol Extension and Applications</a></h2> <p>AT Protocol was designed from the beginning to balance stability and interoperation against flexibility for third-party application development.</p> <p>The core protocol extension mechanism is development of new Lexicons under independent namespaces. Lexicons can declare new repository record schemas (stored in collections by NSID), new HTTP API endpoints, and new event stream endpoints and message types. It is also expected that new applications might require new network aggregation services ("AppViews") and client apps (eg, mobile apps or web interfaces).</p> <p>It is expected that third parties will reuse Lexicons and record data across namespaces. For example, new applications are welcome to build on top of the social graph records specified in the <code>app.bsky.*</code> Lexicons, as long as they comply with the schemas controlled by the <code>bsky.app</code> authority.</p> <p>Governance structures for individual Lexicon namespaces are flexible. They could be developed and maintained by volunteer communities, corporations, consortia, academic researchers, funded non-profits, etc.</p> <h2 class="scroll-mt-24" id="what-is-missing"><a class="group text-inherit no-underline hover:text-inherit" href="#what-is-missing">What Is Missing?</a></h2> <p>These specifications cover most details as implemented in Bluesky's reference implementation. A few important pieces have not been finalized, both in that reference implementation and in these specifications.</p> <p><strong>Account Migration:</strong> the identity and repository systems were designed to enable easy migration of accounts between PDS service providers, even in the face of a non-cooperative service provider, without impact on the social graph. Some details have not been worked out yet: optional PDS-to-PDS repository transfer; downstream behavior during transfer grace periods; rate-limit norms to prevent network abuse; blob migration; etc.</p> <p><strong>Repository Sync:</strong> the repository commit schema has a revision field, and the <code>com.atproto.sync.*</code> Lexicons can reference these via a <code>since</code> parameter to do partial fetches of repository content. This mechanism is largely settled, but not yet specified here in detail.</p> <p><strong>Repository Event Stream:</strong> the <code>com.atproto.sync.subscribeRepos</code> subscription Lexicon is a core part of the protocol and the details need to be described in more detail. This includes the semantics of the "commit" message type, which includes both a "CAR slice" of new repository blocks, and an operation list.</p> <p><strong>Moderation Primitives:</strong> The <code>com.atproto.admin.*</code> routes for handling moderation reports and doing infrastructure-level take-downs is specified in Lexicons but should also be described in more detail.</p> <p><strong>Lexicon Resolution:</strong> an automated way to look up and fetch Lexicon schema definition files for a given type name (NSID)</p> <h2 class="scroll-mt-24" id="future-work"><a class="group text-inherit no-underline hover:text-inherit" href="#future-work">Future Work</a></h2> <p>Smaller changes are described in individual specification documents, but a few large changes span the entire protocol.</p> <p><strong>Non-Public Content:</strong> mechanisms for private group and one-to-one communication will be an entire second phase of protocol development. This encompasses primitives like "private accounts", direct messages, encrypted data, and more. We recommend against simply "bolting on" encryption or private content using the existing protocol primitives.</p> <p><strong>Protocol Governance and Formal Standards Process:</strong> The current development focus is to demonstrate all the core protocol features via the reference implementation, including open federation. After that milestone, the intent is to stabilize the lower-level protocol and submit the specification for independent review and revision through a standards body such as the IETF or the W3C.</p></div></article></main><footer class="mx-auto w-full max-w-2xl space-y-10 pb-16 lg:max-w-5xl"><div class="flex"><div class="flex flex-col items-start gap-3"><a class="inline-flex gap-0.5 justify-center overflow-hidden text-sm font-medium transition rounded-full bg-zinc-100 py-1 px-3 text-zinc-900 hover:bg-zinc-200 dark:bg-zinc-800/40 dark:text-zinc-400 dark:ring-1 dark:ring-inset dark:ring-zinc-800 dark:hover:bg-zinc-800 dark:hover:text-zinc-300" aria-label="Previous: Schemas & Lexicon" href="/guides/lexicon"><svg viewBox="0 0 20 20" fill="none" aria-hidden="true" class="mt-0.5 h-5 w-5 -ml-1 rotate-180"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" d="m11.5 6.5 3 3.5m0 0-3 3.5m3-3.5h-9"></path></svg>Previous</a><a tabindex="-1" aria-hidden="true" class="text-base font-semibold text-zinc-900 transition hover:text-zinc-600 dark:text-white dark:hover:text-zinc-300" href="/guides/lexicon">Schemas & Lexicon</a></div><div class="ml-auto flex flex-col items-end gap-3"><a class="inline-flex gap-0.5 justify-center overflow-hidden text-sm font-medium transition rounded-full bg-zinc-100 py-1 px-3 text-zinc-900 hover:bg-zinc-200 dark:bg-zinc-800/40 dark:text-zinc-400 dark:ring-1 dark:ring-inset dark:ring-zinc-800 dark:hover:bg-zinc-800 dark:hover:text-zinc-300" aria-label="Next: Data Model" href="/specs/data-model">Next<svg viewBox="0 0 20 20" fill="none" aria-hidden="true" class="mt-0.5 h-5 w-5 -mr-1"><path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" d="m11.5 6.5 3 3.5m0 0-3 3.5m3-3.5h-9"></path></svg></a><a tabindex="-1" aria-hidden="true" class="text-base font-semibold text-zinc-900 transition hover:text-zinc-600 dark:text-white dark:hover:text-zinc-300" href="/specs/data-model">Data Model</a></div></div><div class="flex flex-col items-center justify-between gap-5 border-t border-zinc-900/5 pt-8 sm:flex-row dark:border-white/5"><p class="text-xs text-zinc-600 dark:text-zinc-400">© Copyright <!-- -->2024<!-- -->. 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A Personal Data Server (PDS) acts as an account's trusted agent in the network, routes client network requests, and hosts repositories. A relay (previously referred to as a Big Graph Service, or BGS) crawls many repositories and outputs a unified event firehose.\"]}],\"\\n\",[\"$\",\"p\",null,{\"children\":[[\"$\",\"strong\",null,{\"children\":\"Application:\"}],\" APIs and record schemas for applications built on atproto are specified in \",[\"$\",\"$L5\",null,{\"href\":\"/specs/lexicon\",\"children\":\"Lexicons\"}],\", which are referenced by \",[\"$\",\"$L5\",null,{\"href\":\"/specs/nsid\",\"children\":\"Namespaced Identifiers\"}],\" (NSIDs). Application-specific aggregations (such as search) are provided by an Application View (App View) service. 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