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There are two types of double spend. The first is the easy one, solved by nodes validating the chain; the second one is the harder one, and what mining is intended to solve (or at least, disincentivize). In both Bitcoin and the system you're describing, it is indeed easy to make sure the chain received by nodes does not contain any double spends: just ...


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A Proof of Work scheme could theoretically "fail" if a large majority of miners are malicious. Similarly, your scheme could theoretically "fail" if a large majority of block composers are malicious. Nakamoto 2008 "solved" the problem of choosing the next miner (Byzantine Generals) by introducing a Deus Ex Machina, the physical ...


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