I've Been Involved in a Lot of Electronic Cash Projects Since the Mid Nineties.

hash cash was kind of the inspiration for proof of work. It's a way to impose a cost on the sender without that having been respentable, and that was a simpler thing to do in a decentralized way. We spend a ball, electronit cash out, f it in. Of course, hat's even more difficult. But there were certainly, i many things proposed, like the well known ones, ther could be money by wadi and bit god, by exabo and upheld by halfiny - which are all based on ashgash. The second as a kind of proof of concept that halfiny ran for a while, but it's unfortunately centralized. So eventually we got