FYI: proof of work for spam protection has been around since the late ’90s: https://en.wikipedia.org/wiki/Hashcash https://en.wikipedia.org/wiki/Hashcash. Bitco

FYI: proof of work for spam protection has been around since the late ’90s: https://en.wikipedia.org/wiki/Hashcash https://en.wikipedia.org/wiki/Hashcash. Bitcoin explicitly built on top of that work. In a vacuum, it’s a nice idea, but in practice the problems are more social than technical, and such solutions as these never pan out at scale. If you’re interested in learning more, read up on the term for this phenomenon (coined because enthusiastic proposals happen with monotonous regularity): Final Ultimate Solution to the Spam Problem. https://www.dmuth.org/fussp/ https://www.dmuth.org/fussp/ is a decent starting point.