> Sure this isn't exactly blockchains or whatever, but it's basically the same idea. This idea is older than blockchains; it's basically hashcash (https://en.w

> Sure this isn't exactly blockchains or whatever, but it's basically the same idea. This idea is older than blockchains; it's basically hashcash (https://en.wikipedia.org/wiki/Hashcash https://en.wikipedia.org/wiki/Hashcash), which AFAIK was one of the inspirations for Bitcoin.