W3C ActivityPub W3C Recommendation
Federation protocol for social interactions — fediverse/Mastodon ecosystem
AT Protocol Bluesky PBC
Federation protocol with portable data repositories — Bluesky ecosystem
W3C Decentralised Identifiers (DIDs) W3C Recommendation
Protocol-agnostic identity anchoring — resolves to both AP actors and AT Proto repos
W3C Verifiable Credentials v2.0 W3C Recommendation
Data model for all Idun credentials
OpenID4VCI / OpenID4VP OpenID Foundation
Credential issuance and presentation between wallets and services
SD-JWT (Selective Disclosure JWT) IETF Draft
Selective disclosure — reveal only needed claims from a credential
WebFinger (RFC 7033) IETF RFC
Discovery — resolve @handle to DID, actor URI, and Idun credentials
EUDI ARF (Architecture Reference Framework) EU Commission
EU specification for wallet interoperability and credential exchange