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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The reason PoW "solves" DDoS is because nodes don't have to process a 1 (or up to 32mb?) block of transactions and validate each one if the PoW header doesn't match. If you didn't have the PoW header, then DDoS'ers would just spam the network with bad blocks and crash it.
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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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isn't that a proof that more work has been done.. hence the proof-of-work? xD
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