Definition ∞ A legacy code audit is a systematic examination of existing, older software code, often within a blockchain or smart contract context, to identify vulnerabilities, inefficiencies, or compliance issues. This process assesses the security posture and operational integrity of systems that have been in use for a significant period. The goal is to ensure continued reliability and mitigate potential risks in mature projects.
Context ∞ Legacy code audits are crucial for maintaining the security of established blockchain protocols and decentralized applications, as older codebases may contain undiscovered flaws or become susceptible to new attack vectors. These audits are particularly relevant when protocols undergo upgrades or integrations with newer systems. News often reports on such audits, especially after security incidents or before significant protocol changes, underscoring their importance for long-term project health.
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