{
  "manageEntity": {
    "action": "Save",
    "entityId": "528880",
    "entityType": "Track",
    "nonce": "0xfd92cbb18279dc026db80a640eed38985980f9a0cfd8383e6664591c29b72da1",
    "signature": "0xd2dd01d7581289f9552824fa2b30f96879e6946696cfb03d3cc71a6ee6c40a9a6870e4a889c26299b346b26d26371f0c8db25d176d242d47ee4ddf3ce404a7531b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}