This is a neat idea. I don't know enough about the underlying proof-of-work stuff to comment on how effective this could be, but I think it's pretty funny that

This is a neat idea. I don't know enough about the underlying proof-of-work stuff to comment on how effective this could be, but I think it's pretty funny that the UI examples say "I'm a human". I guess "there's only a few of me at most" or "I could allocate enough computation to this that I'm probably not up to no good" don't read as clearly.