GUEST ESSAY: Tapping Bitcoin’s security — to put a stop to ‘51% attacks’ of cryptocurrency exchanges
The Last Watchdog
OCTOBER 28, 2021
However, if an attacker possesses 51% or more of the computational power of the entire network, they can force nodes to accept their alternate chain, because it’s built with more mining power than the “legitimate” chain currently on the network. Attackers can use this method of rewriting history to reverse transactions.
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