{
  "manageEntity": {
    "action": "Save",
    "entityId": "547873969",
    "entityType": "Track",
    "nonce": "0x850a2aa9da0ed0cd6add0c53e5d083c3abf7616183dccac27ab349a237ca723f",
    "signature": "0xb0e8f8b803860cbee7f1f28c7d13f2ba9d83b125b43136a86be1da19622f3707145883e79b473b65233d0c49dbe9417106902ba74f9005a6744e859170e590f41c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}