{
  "manageEntity": {
    "action": "Save",
    "entityId": "1589878521",
    "entityType": "Track",
    "nonce": "0x5997cb6f669a1acfc7eb83ff8ff285744d98a48f52f9412ee2e104ebc1cc89d7",
    "signature": "0x4beee36a874c74be272b71886719f109f1f4515d277c0c45882aa5ac68a7a1533a8bf44ddc632fd0d6df2a85196320eca738f412bbefb67f1bb104f49d1819511b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}