> "it proves concretely that someone existed at a certain time and place, as verified by another certain group of people" We've had the PGP/GPG web of trust fo

> "it proves concretely that someone existed at a certain time and place, as verified by another certain group of people" We've had the PGP/GPG web of trust for a while, too. People use that, but it's not exactly popular (mainstream popular). In order for this to become popular, it needs foolproof-simple UI/UX and great marketing. Concluding with "look up BlockchainID on Github" is neither (well, except for people who are already on the PGP/GPG web of trust).