{
  "manageEntity": {
    "action": "Save",
    "entityId": "1216232588",
    "entityType": "Track",
    "nonce": "0xe65f54d4d7fa3e7ef6de8a1251ca924103acf83b703ef7c5dd0cb535552e9c78",
    "signature": "0x394d9a7f8808d9c66b131bd24bd82047ffb0afc2ead6e603714274c6fa9ee0cc0ff262dcd519e0c635b764d38c54a7e8ee28abb2cda0470a5cc164f1350de5eb1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}