{
  "manageEntity": {
    "action": "Save",
    "entityId": "937538493",
    "entityType": "Track",
    "nonce": "0x5b586261d08d67ea0b9a51e97911ad53ac3cdedb6da523582049d787c9549f75",
    "signature": "0x919e38c172523c30e60817cf5c779046c9e086bc41844dbb098d89ed6d50f67142c7128bb4170f10e9c622b9f01367640172033e190b049a5204d164a6d8b3741c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}