The word "timestamping" doesn't appear anywhere in the blog post so here's a related link: https://en.wikipedia.org/wiki/Trusted_timestamping https://en.wikipe

The word "timestamping" doesn't appear anywhere in the blog post so here's a related link: https://en.wikipedia.org/wiki/Trusted_timestamping https://en.wikipedia.org/wiki/Trusted_timestamping And for historical trivia, the oldest blockchain via printed ads in NYTimes: https://www.vice.com/en/article/j5nzx4/what-was-the-first-blockchain https://www.vice.com/en/article/j5nzx4/what-was-the-first-bl... And you have other timestamping services like GlobalSign and embedding data into bitcoin blockchain.