{"endpoint":"POST /verify/action-ref","description":"Compute the canonical action_ref for any agent action payload. Returns the RFC 8785 JCS canonical form and SHA-256 digest. Verified byte-identical across 8 independent implementations.","input_schema":{"agent_id":"string — DID or URL identifying the agent","action_type":"string — dot-namespaced action class (e.g. payment.authorize)","scope":"string — chain-scoped target (e.g. base:0xabc...)","timestamp_ms":"integer — Unix timestamp in milliseconds, not float"},"canonicalization":"RFC 8785 (JCS) — rfc8785.dumps()","hash":"SHA-256 hex digest of canonical bytes","spec_ref":"https://datatracker.ietf.org/doc/draft-hopley-x402-canonicalisation-jcs-v1/","implementations_attested":8,"attestation_ref":"https://api.algovoi.co.uk/.well-known/interop-harness.json"}