China’s National Internet Emergency Response Center (CERT) has launched a website for blockchain security vulnerabilities. It has an existing database, the China National Vulnerability Database with blockchain now added as a subset. So far, it identified 247 blockchain vulnerabilities, of which 246 are for public blockchains. One was in a peripheral system.
The fact that the vulnerabilities are almost exclusively with public blockchains does not imply private blockchains are more secure. They’re just less open to scrutiny.
Public blockchain advocates argue that because of the extreme openness and regular hacking attempts, public blockchains tend to be more security hardened. And those that are well decentralized are immutable. Any blockchain on just two nodes isn’t immutable, because two nodes are capable of manipulation. The larger the number of nodes, the more data that needs manipulation.
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