As you said in your edit, you can of course base64 the GUID, but also don't most GUID libraries have an option to just omit the hyphens? I know .NET allows you

As you said in your edit, you can of course base64 the GUID, but also don't most GUID libraries have an option to just omit the hyphens? I know .NET allows you to do that, and even correctly parse GUIDs that don't have any hyphens. I usually did that in .NET simply because I thought it was prettier without the hyphens.