Bitcoin Core, the software for the Bitcoin
The review was handled by Quarkslab, a French cybersecurity company. The audit was organized by OSTIF on behalf of Brink, a nonprofit that supports Bitcoin development.
The audit lasted over three months, from May to September. It focused mainly on the parts of the software that handle data sharing between users and block validation.
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The codebase is large, over 200,000 lines of C++ code, but the report described it as well-maintained and thoroughly tested. According to the reviewers, the software showed no major or moderate security issues.
They identified just two low-priority problems and offered advice on strengthening the test tools and increasing their coverage.
A key area of the review was Bitcoin’s peer-to-peer network layer. This part lets users’ computers share transactions, find other nodes, and pass around new blocks. Each node usually connects to over 100 others.
The audit found no way for harmful data to bypass checks, nor any flaws in the system used to block misbehaving peers.
The audit also included a look at how Bitcoin Core manages pending transactions, updates the blockchain state, and handles changes when different versions of the chain compete.
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