According to The Block, Bitcoin Core development activity saw a significant increase in 2025, reversing a years-long downward trend. Annual data released by Jameson Lopp, Chief Security Officer at Casa, showed a 60% year-over-year increase in Bitcoin Core mailing list traffic, with 135 independent code contributors participating in development and approximately 285,000 lines of code changes. This upward trend reversed the continuous decline since 2018, when the number of contributors had peaked at around 193. In 2025, Bitcoin Core also completed its first public third-party security audit, conducted by Quarkslab and funded by the nonprofit organization Brink, which found no critical or high-risk vulnerabilities.
Bitcoin Core Development Activity Surges in 2025, Reversing Years of Decline
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Summary
Bitcoin news in 2025 highlights a significant surge in Bitcoin Core development activity, reversing years of decline. Mailing list traffic increased by 60% year-over-year, with 135 contributors and 285,000 code changes. While these numbers were lower than the 193 contributors in 2018, they now indicate a strong recovery. A public security audit conducted by Quarkslab, funded by Brink, found no critical vulnerabilities. Analysis of Bitcoin suggests a renewed focus on protocol security and development.
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