{
  "manageEntity": {
    "action": "Save",
    "entityId": "779962743",
    "entityType": "Track",
    "nonce": "0x149a538b2ffcdab511d526e6ec1124ddd31d17ffea4fd48cea2454d3fa54cce0",
    "signature": "0xa1723304ae90801cdacebed26b31492281834622ba6f57bab1eef0d5522b77af267c0a0c0e8025a70bc6c5822b3708c1c32b2dc0b12400c1640ed1f337b3a4861b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}