{
  "manageEntity": {
    "action": "Save",
    "entityId": "250136",
    "entityType": "Track",
    "nonce": "0x710dcfe47e8edb12f963a028acde87808d7fe30b52f56e781171523fbcd5efac",
    "signature": "0xc2c3fa050fe3754dd53be9ff37dbc3c3ea6408fcc4bc12add97176fbfd4da0426fb46d11f2e6e799f1010f28e5a2b91670e574a4b9374bcd8fac127227f7125f1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}