







Specification for CID-first attestations on AT Protocol records. Inline and remote cryptographic signatures with replay-attack prevention.
ATProtocol Attestations: Cryptographic Signatures for the Decentralized Web - Nick's Blog
This post introduces the formal ATProtocol attestation specification, a framework for adding cryptographic signatures to ATProto records through two complementary patterns: inline attestations that embed signatures directly in records, and remote attestations that store proof in separate repository records. The specification prevents replay attacks through repository binding, uses CID-based content addressing for integrity, and provides the cryptographic foundation for verified credentials, trusted content, and authenticated interactions in the decentralized ATProtocol ecosystem.

AT Protocol - AT Protocol
Specification for the Authenticated Transfer Protocol (AT Protocol)

Building Unforgeable Professional Endorsements with ATProtocol - Nick's Blog
Traditional professional endorsements on platforms like LinkedIn lack cryptographic proof—anyone could forge them, and the platform controls the truth. This article introduces a two-record architecture using ATProtocol's Content Identifiers (CIDs) and Decentralized Identifiers (DIDs) to create mathematically unforgeable mutual attestations. By separating proof creation from endorsement acceptance and leveraging the firehose for distributed validation, we build a system where both parties cryptographically consent and no central authority can manipulate the record.

Introducing attested.network: Proof of Payment for ATProtocol - Nick's Blog
attested.network is an open spec for decentralized proof of payments on ATProtocol, built on what we learned making atprotofans.com. It formalizes the three-party attestation model and opens it up for any app to implement.
OAuth for AT Protocol | Bluesky
We are very happy to release the initial specification of OAuth for AT Protocol! This is expected to be the primary authentication and authorization system between atproto client apps and PDS instances going forward, replacing the current flow using App Passwords and createSession over time.




OAuth Patterns - AT Protocol Docs - AT Protocol
Auth for AT Protocol application developers.

OAuth Patterns - AT Protocol Docs - AT Protocol
Auth for AT Protocol application developers.


ATProtoFans - Support Your Favorite Creators
Decentralized supporter attestation service for the ATProtocol ecosystem. Support creators with cryptographically verifiable relationships.
ATProtoFans - Support Your Favorite Creators
Decentralized supporter attestation service for the ATProtocol ecosystem. Support creators with cryptographically verifiable relationships.

Blink: Intent to Experiment: Signature-based Integrity
Blink: Intent to Experiment: Signature-based Integrity
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