Why do proof of work systems ramp up the difficulty of hash solving while keeping latency constant, instead of keeping difficulty constant while nodes compete to reduce latency? The later seems more useful, and not inflationary.
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Because every BitCoin block has to be validated by every (main) node, because there is nothing to keep miners "honest". They can just put double-spends or unsigned stuff in there, or whatever. So BitCoin counts on all the nodes to actually validate each block, which is expensive.
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How there is nothing? you are constantly incentivized to be honest, otherwise this whole thing would be pointless and unprofitable in the long run... PoW is what prevents the double spending.
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