docs(extensions): register Settlement Attestation, Composite Trust Query, and RFC 9421 Message Signing extensions (AlgoVoi-authored)#1896
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…omposite Trust Query, and RFC 9421 Message Signing extensions (AlgoVoi-authored)
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This pull request updates the extensions documentation by adding four new AlgoVoi-authored extensions to the reference table. The review feedback suggests appending a version indicator (v1) to the RFC 9421 Message Signing Extension description to maintain consistency with the other entries in the table.
…tlement-ctq-rfc9421 # Conflicts: # .github/actions/spelling/expect.txt
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Closes #1897.
Summary
Registers four AlgoVoi-authored extensions in the example extensions table -- Compliance Gate, Settlement Attestation, Composite Trust Query, and RFC 9421 Message Signing.
Compliance Gate Extension (https://docs.algovoi.co.uk/compliance-gate-v1)
Method Extension -- admission-time sanctions/KYC gate returning ALLOW / REFER / DENY as a Compliance Receipt canonicalized under RFC 8785 (JCS). Companion IETF I-D: draft-hopley-x402-compliance-receipt. Also filed as PR #1886 (superseded by this combined PR if preferred by maintainers).
Settlement Attestation Extension (https://docs.algovoi.co.uk/settlement-attestation-v1)
Method Extension -- post-settlement categorical record from the facilitator: SETTLED / PENDING_FINALITY / REVERSED. settled_payment_ref binds the attestation to its Payment Mandate by JCS canonical sha256: reference. Companion IETF I-D: draft-hopley-x402-settlement-attestation.
Composite Trust Query Extension (https://docs.algovoi.co.uk/composite-trust-query-v1)
Method Extension -- multi-issuer composite verdict: TRUSTED / PROVISIONAL / INSUFFICIENT_EVIDENCE / UNTRUSTED. Composes compliance, settlement, and counterparty-risk evidence from independent parties into a single verifiable envelope. Companion IETF I-D: draft-hopley-x402-composite-trust-query.
RFC 9421 Message Signing Extension (https://docs.algovoi.co.uk/rfc9421-binding-v1)
AlgoVoi-authored binding of RFC 9421 (HTTP Message Signatures) and RFC 9530 (Digest Fields) to A2A task envelopes -- transport-layer cryptographic signing with multi-hop proxy-chain survival. Reference impl: algovoi-rfc9421-verifier (PyPI / npm, Apache 2.0).
All four are AlgoVoi-authored, Apache 2.0, with reference implementations on PyPI and npm. Byte-for-byte cross-validated across 8 independent JCS implementations.
AlgoVoi (chopmob-cloud) -- Acquisition enquiries: https://docs.algovoi.co.uk/acquisition