{
  "manageEntity": {
    "action": "Save",
    "entityId": "549311406",
    "entityType": "Track",
    "nonce": "1791904387953658001",
    "signature": "0x96c6462e541c521c28c188027339419ebe1bd052f9ad32286142eedb79985bf67507d260b449b91a171f3997f2c7c83348b6368631e750e99f5f32af1dbbc1c01b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}