{
  "manageEntity": {
    "action": "Save",
    "entityId": "566535959",
    "entityType": "Track",
    "nonce": "0xa8465ed3214c3b4c009704c4145da82c1ceb3489d60c795b7905b418f61d0b37",
    "signature": "0x02a6c4c8353a852158378ad43c8803b664bdebe2c3d3dc331c667f72c67a3523633ccf5089c5ce7e986c15329cc4432860f25ff83b188e11b7bb0b7629951d991b",
    "signer": "0x6f4f67A10406f9800A35FFB82F5B17431982dA70",
    "userId": "548107023"
  }
}