Comment by perihelions
1 year ago
That's apparently explained in their citation [1], the paper about cryptographically anonymous token protocols. It's not a simple plaintext token.
https://news.ycombinator.com/item?id=19623110 ("Privacy Pass (cloudflare.com)", 53 comments)
Yep, in fact Cloudflare are the original people who came up with this, when people were complaining about seeing turnstile screens too often