{
  "manageEntity": {
    "action": "Save",
    "entityId": "1525061946",
    "entityType": "Track",
    "nonce": "0xb30c39663d1e5df968bec2c1331cb583058a6ef7b8e0c990d604db3b69a08d98",
    "signature": "0x6e91a1cc0380ecf365e8a69b7361b6e4e98ba61752da86c831717503990dfdd515d6d8a3bde66ff71c84a251c27a81dffbc496c58ad1d285bf270668f72a1ffa1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}