[revelio]

He's saying that won't work, because the goal is not actually to fingerprint or mark users. It's to ensure that the thing connecting to their servers at that moment is a web browser and not something pretending to be a browser. Give away tokens that say "i'm a browser honest" and they'll just get cloned all the bots.

[blincoln]

Rate-limit the number of different source IPs that the token can be used from within a given period of time, or the number of requests per second that can use that token without having to re-verify?

[Brian_K_White]

If they can track the token that way, that blows the whole point, the token becomes a persistent unique id.

The idea was to prove that a token exists without disclosing the token itself, nor any sort of 1:1 substitution.

That sort of thing is definitely possible, that's not the conundrum. What they said is one of the conundrums I have to admit. If the server doesn't know who the user is, then the server doesn't know it's a valid user vs a bot.

But I only agree it's a problem. I don't agree it's a problem without a solution.