Verifies SPEC.md §23 input_attestations entries against a target artifact's policy_parameters: vc-2.0, c2pa-manifest, rfc3161-snapshot, and zktls, all four types in one report. Each pointer is resolved by RFC 6901 and its digest bound to the attested value; per-entry results carry {pointer, type, structural, verifiable} plus a zero_attestation_caveat_shown marker. This page performs structural pointer/digest checks only; full cryptographic verification (RFC 3161 CMS chain, Data Integrity signatures) runs server-side via the MCP tool.
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Scope
Structural checks only in-browser: pointer resolution (RFC 6901) + canonical digest binding. Full cryptographic verification (RFC 3161 CMS/TSA chain, eddsa-jcs-2022 Data Integrity signatures) runs server-side via the verify_input_attestations MCP tool, reusing the same §20 anchor-binding and §16 proof-binding machinery. An artifact with zero attestations remains fully conformant; the caveat stays visible either way.
Presets
Inputs
Result
Pointer
Type
Structural
Verifiable
Freshness
Execution Hash & §4 Artifact
SHA-256 execution hash (JCS canonical, RFC 8785):
Related
Reuses the §20 anchor-binding RFC 3161 verifier (rfc3161-snapshot) and the §16 Data Integrity proof machinery (vc-2.0). c2pa-manifest structural checks follow art-123's own manifest validator rules.