I built the same thing in terrible form a few years ago! https://github.com/007/hashcash-js https://github.com/007/hashcash-js I always wanted to go back and p

I built the same thing in terrible form a few years ago! https://github.com/007/hashcash-js https://github.com/007/hashcash-js I always wanted to go back and put in a TOTP seed and properly productize it to make it easier to use, but I never made the time. It makes me happy to see someone take it seriously, and build a proper version for modern browsers.