{
  "manageEntity": {
    "action": "Save",
    "entityId": "741986848",
    "entityType": "Track",
    "nonce": "0x59c4584485527243a5943d964dca58e417302ee1556d38636c86006830b6dea5",
    "signature": "0x00078ea2e0876d56ac30df9bdc11fe068dbc7dabe1978f3f80946cb8928188a80b6e6c22c79c4d7f9bd7f7cd5ce3748b58500342e14e56d6f1ebe34a5c91109a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}