{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907448598",
    "entityType": "Track",
    "nonce": "0x667521de549cfe826bab1e153ab02345af7424adb156421f4648fe4e19683036",
    "signature": "0x7581f145c373cd86bfdc2d592f13a9c80f9d7b3727c1c897345322d6ae405a910ffb151f914093c83815bc660c08c52b303058c1378837c8277fe8d715aa0ea01b",
    "signer": "0x9e28dC40BF975c92B3D575d5b719850167D30fB6",
    "userId": "606506732"
  }
}