Reference implementations
External standards cited
- RFC 2119 / RFC 8174 — Key words for use in RFCs to Indicate Requirement Levels.
- RFC 8785 — JSON Canonicalization Scheme (JCS), the deterministic serialization ARP signs over.
- RFC 3339 — Date and Time on the Internet: Timestamps, the format of
issued_at. - W3C did:key Method — the DID method used for
issuer_didandprincipal_did. - BCP 47 — Tags for Identifying Languages, used by
accessibility.summary_language. - ISO 3166-1 / ISO 3166-2 — Country and subdivision codes, used by
jurisdictionfields. - ISO 4217 — Currency codes, used by
action.amount.currency. - IANA Media Types — used by
evidence.screenshots.mime. - EU AI Act, Article 13 — transparency obligations the receipt shape is designed to satisfy.
- GDPR Articles 5, 6, 30 — data residency and processing records relevant to
jurisdiction.data_residency. - HIPAA §164.312(b) — audit controls.