51% Attack

A 51% attack occurs when a malicious actor controls more than half the computer power or mining hash rate on a network to disrupt the integrity of the blockchain. The actor could be a single person or a group acting in concert. Consensus between network participants is required for transactions to be confirmed. When an entity forms the majority in the consensus mechanism, it can modify the order of transactions, prevent transactions from being confirmed and double spend. The risk of a 51% attack decreases as the hashing power increases because it takes more computing power to obtain a majority control.

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