Vitalik: 51% Attack cannot rewrite a Block, but off-chain trust will bring new risks.

Golden Finance reported that Ethereum co-founder Vitalik Buterin emphasized that the key security attribute of Blockchain is that even in the event of a 51% attack, invalid blocks cannot be turned into valid ones. Therefore, collusion among 51% validators or software failures cannot steal user assets. However, he warned that if there is a reliance on validators to perform off-chain tasks that the chain itself cannot control, then the 51% validators could collude to provide incorrect results, and users would lose their protection mechanism.

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