{
  "manageEntity": {
    "action": "Save",
    "entityId": "1000950",
    "entityType": "Track",
    "nonce": "0x53f013cc12c50b76461ccdcdaa9204ec0dbae0f909153fce09b570a5289f362a",
    "signature": "0x987b25f2c6e75cca5d71d5918b69bbcf8e8908bbc29739a39c767ed92ea926823166a6c960eac843eeb5df677ca51df3932fead27c3d315344c148730a920c621b",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}