{
  "manageEntity": {
    "action": "Save",
    "entityId": "687400410",
    "entityType": "Track",
    "nonce": "0x0ce2e88990f771d79e109d3d4645c7f60e7c60c7465cc439d12f01c03150a51e",
    "signature": "0xa429011b37c40caff91c5df3f7c4ebd7e101ff3854f17041b53d1310a25d2afc4795ce86ad4c15b6d89502d3b1193d2014e553d53a761e7d35558ddecabf1b551c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}