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Can you explain the concept of a 51% attack in cryptocurrency?

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A 51% attack in cryptocurrency refers to a situation where a single entity or group of entities control more than half of the mining power or network hash rate on a blockchain network. This majority control allows them to manipulate the network's transactions, potentially double-spend coins, prevent new transactions from being confirmed, or even reverse transactions that were completed while they were in control. This undermines the security and integrity of the cryptocurrency network.

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