{
  "manageEntity": {
    "action": "Save",
    "entityId": "863436937",
    "entityType": "Track",
    "nonce": "0x2952a6f9f22d90e9b888b09e31023fa8c280f8a18ec999f65386db01c7b72bed",
    "signature": "0x028a83903992254df0979bceba31778cbc87722a689f66b971aebd19b5a3f4e57f9b349b2af23a2b15e570cc35f910242d12166b87509f136b8b614506f19d001c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}