{
  "manageEntity": {
    "action": "Save",
    "entityId": "464770308",
    "entityType": "Track",
    "nonce": "0xbfca1030fc6a50a0276ba19f1d5f5075606078ab55f8f192a3bb98a6eb433d77",
    "signature": "0x33214100aafbc11b1a4d7cad42ab21e27cebcc1383163065a02e60e46d92b6eb5dc809de8e1661e4703f7eeadcdece5cf3bb9054340b5a8801d5bffc83fc34691c",
    "signer": "0x2f890F488c7DE6221893B82B90bea73E2304cE3E",
    "userId": "344578316"
  }
}