{
  "manageEntity": {
    "action": "Save",
    "entityId": "512817083",
    "entityType": "Track",
    "nonce": "0x16c66b823c3e5d4f1ae349407fa65c1b9987f79ed9948c9f0a32111d70e9989f",
    "signature": "0x489a23ed498c54b08a6018ea056923bcb392189528771ccd51322ce711e90e906a8727ee5169d45689c00605e7253482702dcd517406b3bcfdfb62b012f2a0a61c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}