{
  "manageEntity": {
    "action": "Save",
    "entityId": "1209855819",
    "entityType": "Track",
    "nonce": "0x729eb62206890be13dee74f4790eaefff0240caea4ebd95c7bb72a95b920781b",
    "signature": "0x5ccd2d027b746be6e977e7aa31e233d48054550f543b9ff52f3b891336154dc312442808736940ca30fcd03fc2b5a50ce81fff06db90fb1211c88579b76dc7ed1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}