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by jre
3110 days ago
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You forgot to mention that nodes always consider the longest block chain to be the consensus. A 51% (majority) attack is when one miner is able to produce more blocks than the rest of the network, therefore controlling consensus. Such a miner could do a double-spend transaction by first spending on the short chain and then reverting his transaction on the longest chain. See https://en.bitcoin.it/wiki/Majority_attack |
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