Signed web pages with SXG

Signed exchanges (SXG) let websites cryptographically sign their pages so that content can be prefetched and attributed to its origin, and the author argues this could enable zero-knowledge proofs about publicly available web data. Proposed examples include proving an author said something on a given date, proving a stock's price at a specific time, and proving how an election turned out from a news article. The author notes that Cloudflare offers one-click SXG setup, which the author currently uses, and that most sites do not enable SXG yet. The author suggests lobbying high-value sites, Cloudflare, and the Internet Archive to expand adoption, and says that how SXG handles private information is still unclear.