{
  "manageEntity": {
    "action": "Save",
    "entityId": "487086198",
    "entityType": "Track",
    "nonce": "0x671fa3fc574e2b6dd218333e94764e518fcd11c0939aa60eb7b6473c9292d842",
    "signature": "0xafc274ea24bf5ce954feba0acee26df3d68344b021d408415b5492ac86e37bec0b0f16b8ed7cd6c12ef534625c6e95586cb77575f38f5f28028d535d663b3c241b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}