{
  "manageEntity": {
    "action": "Save",
    "entityId": "780166509",
    "entityType": "Track",
    "nonce": "0x2728481fc9d886f3b1fe383a4f825f39db0a499ea5a4b7d069b43689109f5d4c",
    "signature": "0xe19be57a18775929301a1e53ef2db5c29aafbbd443607949710abee586c0acb616fd9cf9d117beba6656b1d90d4266931db50f22b9bd02d6435658c927fecc161b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}