{
  "manageEntity": {
    "action": "Save",
    "entityId": "661428990",
    "entityType": "Track",
    "nonce": "0x88ef00290f1816f06285f1a1e72f153055885f78b089c71937866d97d83faf83",
    "signature": "0x8f351d9b5b47dbbd6c2e289c62ef337bf641756275a75ea8ed95c7f4350133684d7d88671bb195c8393379b33266d192539fb90916fae638deca1af10016e7511c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}