{"issuer":"MIZAN","keys":[{"key_id":"2266fb495f83b0a0","alg":"Ed25519","use":"response-signature","public_key_b64":"DldoufXTa30rmfQINo1q6yAAF68Wk2qfG1A7c3OJ8yw=","format":"raw 32-byte Ed25519"}],"signed_over":"sha256-canonical JSON of the response body with provenance.signature removed (json.dumps(body, sort_keys=True, separators=(',',':')))","verify":"python: Ed25519PublicKey.from_public_bytes(b64decode(public_key_b64)).verify(b64decode(sig), canonical)","scope":"studio.mizan.market REST, A2A, x402 and MCP tool results","rotation":"A rotated key is appended here; old key_ids stay listed with a retired_utc."}