Well it would "just" have to be integrated in browsers. :) You don't have to buy it, you could crunch numbers for an equivalent cost if that's preferable. The

Well it would "just" have to be integrated in browsers. :) You don't have to buy it, you could crunch numbers for an equivalent cost if that's preferable. The advantage is that the effort can be stored and used later, so you need not even add a 2 second latency. Similar to "Privacy Pass".