{
  "manageEntity": {
    "action": "Save",
    "entityId": "108854",
    "entityType": "Track",
    "nonce": "0xffafeaa73601e52743cf422fc59f59c00113ec2ef079b6c8fc31eef78e3d7fb8",
    "signature": "0x1f082dd4738e1261da787b4c864621005643b5b259a43574a853495864ca5030490cbfae220aa9018ba733ecf688b78f2421130a8772f1cb964cf2bb4a06bb431b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}