What is TDE doing with the encrypted UUID?

TDE-check.js

  $.ajax( "https://dangeredwolf.com/tdedb/check.php?regname="  + GetPreferencesIdentifierFromCrypto())
  .done(function(meh) {
    if (meh === "No") {
      ShouldUpgrade = true;
      setTimeout(DisplayMigrateUI1,500);
    } else {
      console.log("Welcome back! <3");
    }
  })
  .fail(function() {
    console.log("An error occurred contacting dangeredwolf.com");
  });