Bitcoin Core has successfully passed its first-ever third-party security audit, which shows that this software, safeguarding the world's largest decentralized network, has reached a high level of maturity.
This audit was conducted by the French security company Quarkslab and commissioned by OSTIF on behalf of Brink, focusing on the most sensitive components of the project, particularly the peer-to-peer (P2P) layer and block validation logic. The entire process lasted 104 days, from May to September.
According to the report, the Bitcoin Core codebase is considered "the most mature and thoroughly tested." Even with its large scale—containing over 200,000 lines of C++ code and more than 1,200 existing test cases—it performed excellently.
The team found no high or medium severity vulnerabilities, only identifying two low-severity issues and a series of recommendations primarily related to fuzz testing tools and test coverage improvements. None of the findings impacted the consensus mechanism, denial-of-service resistance, or transaction validation.
The audit focused on the Bitcoin P2P network layer, which is responsible for forwarding blocks, transactions, and node discovery information across approximately 125 connections at each node. The reviewers reported that no malicious data could bypass validation or the ban mechanisms designed to isolate abnormal nodes.
The team also examined the memory pool logic, chain state transitions, and reorganization handling, where subtle vulnerabilities could cause network-wide disruptions. However, no exploitable paths were identified in these areas either.
"No significant security issues were found. Most recommendations focused on optimizing existing fuzz testing tools to further enhance their effectiveness and coverage," the report concluded.
This audit comes at a time of ongoing controversy between Bitcoin Core and Bitcoin Knots supporters. This months-long debate was sparked by the Bitcoin Core v30 version update, which revolves around whether non-financial data should be allowed on-chain, with critics warning that this could "open the floodgates to spam."
Knots supporters argue that such data should be filtered to prevent illegal or unethical content from being embedded in the Bitcoin ledger. In contrast, Bitcoin Core developers state that imposing restrictions would harm network cohesion, confuse users, and contradict the fundamental principles of technological openness and neutrality.
According to Alex Thorn, head of research at Galaxy Digital, most institutional Bitcoin investors seem unaffected by this controversy. Based on Thorn's survey of 25 institutional clients, 46% were unaware of it, 36% expressed indifference, and the remaining 18% fully supported Bitcoin Core.
Related: Analyst: Cathie Wood's ARK Invest significantly increased holdings in Circle, BitMine, and Bullish amid crypto stock declines.
Original article: “Bitcoin Core Rarely Praised: Independent Audit Finds No Serious Defects”
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