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how that come? What Eth does which Btc can't? You understand that the very idea to shovel useful computations into the blockchain is so stupid.

Ethereum is a smart contract platform. Also useful computation is "useful" so how can it be stupid?

Smart contract? Is it? Even single example of such a 'smart contract', please. :) And if you please a definition? I really challenge you. Will continue to explain what I mean after your reply on this...