{"alg":"Ed25519","public_key_hex":"3e875570f731122a8715700ffe10c544fddd253a7fd04dec9b38cdcf062c3e10","signer_label":"did:hive:governance:sample-v1","retired_keys":[{"public_key_hex":"422b6aa7be7f275a687f101da1a4d2ff75e62b14d7fd8f3fff20303ba436e7a2","first_observed":"2026-09-05","retired_at":"2026-10-19","note":"Operator key directory moved on redeploy and a fresh key was generated; receipts signed 2026-09-05 through 2026-10-19 verify under this key."}],"signature_field":"mock_sig","signature_prefix_real":"0xsig:","signature_prefix_fallback":"0xmock:","verify_example":"GET /v1/receipts/verify/{seq}","note":"Field is named mock_sig for historical compatibility; production signatures use the 0xsig: prefix and are real Ed25519. Receipts signed before a key rotation keep their original signing key; verify responses report that key in public_key_hex and its era in signer_key_era."}