{
  "manageEntity": {
    "action": "Save",
    "entityId": "1850590157",
    "entityType": "Track",
    "nonce": "0x550d90de4e5a08af25b07125932e51286c8ac4201009dcdf4ad43ed32d374f9d",
    "signature": "0x5680fe141e3e56301f612986eec2e2732f44141bab9de5197030a85513bf47c1049cbb983d7ce384a1820689ee29f17a685c9241a26c640157095462a3263d701b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}