51% Attack Resistance

Definition ∞ 51% Attack Resistance describes a blockchain network’s ability to defend against a single entity controlling over half of its computational power. This control could permit a malicious actor to alter transaction history or prevent new transactions from being confirmed. Such robustness is vital for the security and integrity of decentralized digital asset systems. A widely distributed network of participants significantly enhances this protective quality.
Context ∞ Discussions around 51% attack resistance frequently appear in news concerning network security and the decentralization of proof-of-work chains. The financial and computational resources required to execute such an attack against major networks remain substantial, reinforcing their current security. However, smaller or newer chains often face ongoing challenges in maintaining sufficient resistance against potential hostile takeovers. This security aspect is a constant focus in network development and analysis.