What Is a 51% Attack, and How Does It Work?
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最新报道：A 51% attack, where an entity controls over half of a blockchain's consensus, poses significant risks like transaction reversals and double-spending, particularly on smaller proof-of-work networks. While theoretically possible on proof-of-stake chains, such attacks are costlier and riskier due to token slashing. Data shows a 24-hour attack on Ethereum Classic costs over $144,000 versus nearly $53 million for Bitcoin. Past incidents, including Ethereum Classic's multiple attacks in 2019-2020 and Monero's 2025 reorgs, highlight vulnerabilities, though larger networks are becoming more resilient with improved security measures.
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