I think this problem is hard.

It's hard to solve better than it's been solved to date. But I think the existing solution (as described in my other reply) is good enough, if everyone adopts it in a more or less compatible fashion.

That's a rather strong statement which smells of the nirvana fallacy and doesn't seem to be shared by most.

FWIW I completely agree with that statement - as long as it says "most" and not "nearly all".