{
  "manageEntity": {
    "action": "Save",
    "entityId": "737820543",
    "entityType": "Track",
    "nonce": "0xf7e1ce322da1174ebd1c092c1c303aac850891d82602c6b43c7da1094a1ecca4",
    "signature": "0xbba09acb1b17406183978189e1d6017e364d16e4d893693d167b8eb9510cc1631aea8c790446a9c32410a56d14a81535700b8233d9801f7df7305e5bf16a85791b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}