51 Attack | Vibepedia

A 51% attack is a theoretical scenario where a single entity or coordinated group gains control of more than half of a cryptocurrency's mining power or stake. This allows them to manipulate the blockchain, potentially double-spending coins, preventing transactions from confirming, or even reversing recent transactions. While difficult and expensive to execute on large, established blockchains like Bitcoin, smaller altcoins with less distributed mining power are significantly more vulnerable. The threat of a 51% attack remains a persistent concern, impacting investor confidence and the perceived security of decentralized ledger technology.