{"keys":[{"key_id":"brs-1218b418bf5ce066","algorithm":"Ed25519","public_key_pem":"-----BEGIN PUBLIC KEY-----\nMCowBQYDK2VwAyEAaubJWjTbRa/Gj37hD8bekgUT1oJnDvwcFXPswC9t0b0=\n-----END PUBLIC KEY-----\n","valid_from":"2026-08-26T11:33:52Z","valid_to":null}],"purpose":"delivery-record","signed_payload":"b\"blckrhino-send/v1:\" + purpose + b\":\" + hex(record_digest)"}