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 BitCoin protocol just says "well, which ever block chain gets longest is the one we'll go with". So the consensus gets solved either way.
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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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I think you are referring to the orphans blocks... this is something that happens by design, and the longer chain will be the valid one...
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Correct. That is the consensus algorithm of BitCoin, not PoW. PoW does not produce a consensus (obviously, since it requires the longest-chain rule).
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