@onglianxian80

Blockchain security vulnerabilities expose networks to various attacks. A 51% attack occurs when a single entity controls over half of a blockchain’s computing power, enabling them to manipulate transactions, double-spend coins, or halt the network. For example, Ethereum Classic suffered a 51% attack in 2020, resulting in millions in losses. Replay attacks exploit transaction malleability across chains, where a valid transaction is reused on another blockchain to steal funds, as seen in some Bitcoin forks. Other vulnerabilities include smart contract bugs, like the 2016 DAO hack, and phishing attacks targeting private keys, emphasizing the need for robust security measures.

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