Bitcoin Core has completed its first public third-party security audit in its 16-year history, and the results were overwhelmingly positive. Quarkslab, the independent firm commissioned by the Open Source Technology Improvement Fund and funded by Brink, found no critical or high-severity vulnerabilities in the software that underpins the Bitcoin network.
The review ran from May to September and focused on key components, including the peer-to-peer layer, mempool behavior, chain management, and consensus logic. Quarkslab reported only two low-severity issues and 13 informational recommendations. None met Bitcoin Core’s criteria for actual security vulnerabilities.
As part of the audit, Quarkslab also built new fuzzing tools that tested previously untouched parts of the code, while suggesting improvements to thread-safety annotations and testing infrastructure. The project involved engineers from Quarkslab, Brink, and Chaincode Labs.
The milestone is notable given Bitcoin Core’s massive codebase and long history of community-driven development. Despite thousands of contributors and years of peer review, the software had never undergone a formal external assessment until now.
The audit arrives during a volatile period for Bitcoin, with prices sliding and investor sentiment mixed. Even so, industry figures like Bitwise CIO Matt Hougan and MicroStrategy’s Michael Saylor argue that Bitcoin’s long-term fundamentals remain intact, pointing to declining volatility and growing global demand.
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