{
  "manageEntity": {
    "action": "Save",
    "entityId": "428755",
    "entityType": "Track",
    "nonce": "0xba5eddf3982e23fa0b4e42e25ddaced96d2b1a42ac99d610465e48e508ba574b",
    "signature": "0xec41e9b654bbd911ca59b73b9b971eb5218ad13cc247922573cb53764acce28e6f55b8133beb91f64387cef0db0e52ad9062beef962a57ff763d33c2964611f21c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}