{
  "manageEntity": {
    "action": "Save",
    "entityId": "1583674909",
    "entityType": "Track",
    "nonce": "0xe428089c892c9ed64afa76c0c54b28cbd127b397a78a20123142e4368429a332",
    "signature": "0xc390956adc87c6dcdc2e522c0f603c520848a1b59547823b7903765bb52fc23e617aaf82df1103fc7e6f57a6f5a7e4ff3f9747e2287e55639052cc609e8ba37c1b",
    "signer": "0x367680E9B4EfE77a6636091FA6c2c71749Cf7C60",
    "userId": "40274"
  }
}