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PoW is also hard to tune for multiple device types. A cheaper phone is going to struggle to do what a modern desktop CPU can do instantly … so what people end up proposing is reusable pow, where you pay a server to make pow for you, but then we’re kind of back to using bitcoin (which is ultimately reusable pow).
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A coincidence that I came across this post, as for the past 5 hours I've been designing a PoW system as fun activity, for a cooler stateless auth sync.
Only to come to the conclusion that
a) it's kinda absurd for this
b) iOS JS just shits itself