What is the lowest block time of any cryptocurrency? I don't mean the time of an individual block, but the target time per block.
What is the shortest reasonable block interval?
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Ethereum is planning a 12-second block time. Vitalik makes an argument for why that's probably the minimum for now here. Of course, ethereum hasn't been released yet, but Fastcoin with its 12-second block time is probably considered the lowest block generation time currently.