51% Attack, Majority Hash Rate Attack
This definition comes from the technical glossary.
Definition
The ability of someone controlling a majority of network hash rate to revise transaction history and prevent new transactions from confirming.
Synonyms
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51 percent attack
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Majority attack
Links
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51% attack — Bitcoin.org Developer Guide
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What can an attacker with 51% of hash power do? — Bitcoin StackExchange
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Bitcoin.pdf — Satoshi Nakamoto (Bitcoin.org)