{
  "manageEntity": {
    "action": "Save",
    "entityId": "456088479",
    "entityType": "Track",
    "nonce": "0x6be5013ca15bac8c2007969e515ceea1ccf4105b46e598afe5ccfcbf271c1052",
    "signature": "0x42aa17c2b25d6d2a593bb819468af099a33b1fad05fd3a0314d30c0dcaa75b8f5d86f90ba7694393944a19dd67b6c8d2aed77743f46e7eee198411e262b66fd31b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}