{"extension":"https://dynamicfeed.ai/a2a/ext/ground-truth/v1","name":"Dynamic Feed ground-truth witnessing","summary":"This agent can wrap any Dynamic Feed signed receipt as a W3C-shaped GroundTruthReceipt Verifiable Credential that binds to an AP2 mandate id, an A2A interaction id, or a Ruflo decision id. Authorization proves what was intended; ground truth proves what was real.","wrap_endpoint":"POST https://dynamicfeed.ai/v1/vc {\"receipt\": <signed DF envelope>, \"binds_to\": {\"ap2_mandate_id\": \"...\"}}","credential_type":["VerifiableCredential","GroundTruthReceipt"],"binds_to_keys":["ap2_mandate_id","a2a_interaction_id","a2a_task_id","ruflo_decision_id","ref"],"verify":"https://dynamicfeed.ai/.well-known/keys","profile":"VC-Data-Model-shaped; Ed25519 envelope signature (json-sorted-compact); not a JSON-LD DataIntegrityProof. Advisory evidence, not a certification.","human_view":"https://dynamicfeed.ai/receipt-spec","served_by":{"provider":"Dynamic Feed","url":"https://dynamicfeed.ai","verify":"https://dynamicfeed.ai/.well-known/keys","facts":"https://dynamicfeed.ai/v1/facts","mcp":"https://dynamicfeed.ai/mcp","docs":"https://dynamicfeed.ai/llms.txt"},"signature":{"alg":"Ed25519","key_id":"df-ed25519-4cb32e72f333","canonicalization":"json-sorted-compact","sig":"yuSGDFJ2nL7ewTR2wdLJXrbryh_PacFQlTUzf1Wxic7JMXIjyGROQp_8JbxE-LuQekrWDjhEHTeOfVv1mod2CA=="}}