Vitalik: 51% attacks cannot rewrite blocks, but off-chain trust poses new risks
2025-10-26 02:56:44
Vitalik Buterin, co-founder of Ethereum, stressed in a post that the key security property of blockchain is that even a 51% attack cannot make an invalid block valid, so 51% validators collude or software failure cannot steal user assets. But he warned that if you start relying on validators to perform tasks off-chain and beyond the control of the chain itself, 51% of validators may collude to give wrong results, and users will lose protection mechanisms.
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