{
  "manageEntity": {
    "action": "Save",
    "entityId": "668504529",
    "entityType": "Track",
    "nonce": "0xd06b8813cfc0897a48d8936dbc12bc11f4e8b3263e1fa6c7dd52c7a43794cdcf",
    "signature": "0x5a9dc4e1c0f9d3b8be074e84fb7181670ebb5be883860ee3b9708a968992d85b47f9a2be903015f56563d1fc9fac8d52d146fcfb4b740b86477141adeeded3291c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}