{
  "manageEntity": {
    "action": "Save",
    "entityId": "1222942410",
    "entityType": "Track",
    "nonce": "0xa4b3e897381e7ba3912e9e017822db643cbd725031effb97f5b3bff9c9ad7749",
    "signature": "0x4e4cb50c8eb56c863d5159b150612ab0243496b16d846e7250cc0031313d83df760dd06e419dec55190f6d68d8cd427185fcd38fccbf8faa928d2987ebf8bf411c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}