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> You can use PoW as a sort of captcha, for example. If it costs a little bit of CPU to submit a request to a website it's not a big deal for a human. However,
by xtracto 5y ago
> You can use PoW as a sort of captcha, for example. If it costs a little bit of CPU to submit a request to a website it's not a big deal for a human. However, if you're running a bot-net suddenly it starts to hurt!
That's exactly what HashCash was conceived to do (to fight email spam). It was a neat predecessor to Bitcoin.