> And if Satoshi hadn’t thought “how do I make this hard? I know: spin a computer through SHA2 as fast as possible until it finds a magic hash,” Hashcash algor

> And if Satoshi hadn’t thought “how do I make this hard? I know: spin a computer through SHA2 as fast as possible until it finds a magic hash,” Hashcash algorithm used in Bitcoin predates it by about a decade, it was used for spam detection for example. Approaches to secure a blockchain are an active area of research, did you have a better idea to propose?