Ethereum's Vitalik Buterin Gives Shocking Blockchain Warning
Vitalik Buterin, Ethereum co-founder, has cautioned that the blockchain's cryptographic guarantees stop where external trust begins.
On October 26, Buterin explained that even a 51% attack cannot validate an invalid block, as each blockchain node independently verifies new blocks and automatically rejects any that break the protocol's rules.
This decentralized verification protects Ethereum from false ledger entries, even under majority control.
However, Buterin emphasized that this security guarantee only applies to the blockchain's protocol, warning that Ethereum's cryptographic security ends once users rely on validators for off-chain tasks.
Author's summary: Buterin warns of Ethereum's security limitations.