{
  "manageEntity": {
    "action": "Save",
    "entityId": "438897019",
    "entityType": "Track",
    "nonce": "0xb21eff92d3102b84d17f7a676ef807fddc40091ea8b167b5c6ae4090bea83098",
    "signature": "0x0cf4cab6669dc37c104e04755f9fa868ea17945bc1816f4f8eab288816969a461c72124376fb374b27484923d30370a93f2bd9439bf7c21e3a1b50e044ea35cd1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}