{
  "manageEntity": {
    "action": "Save",
    "entityId": "1384818964",
    "entityType": "Track",
    "nonce": "1787484462722005663",
    "signature": "0x616a9baeda47f03bbedb9e4acf5ff6f1aaf79dcb46f400e02e9d9b67f3ec639d20fd1a63fe9f8b3a482c2ce05963324d6acf5bf332c61b28c77e86ec991cd1931b",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}