{
  "manageEntity": {
    "action": "Save",
    "entityId": "502578",
    "entityType": "Track",
    "nonce": "0xfba7134f021762306f31f4aacd3c4ca915ef17e812cca3faa4acab1da102c05d",
    "signature": "0x82c7573eb426f1260a259e8116403cd8a92fcde48f38406c649868b61ee51f355200405c3c3ffd599da245c678634a75a41909147016caa62d4b970aa04fcd401c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}