Bitcoin Core – the reference software operating approximately 78% of the full nodes on the Bitcoin network – shows a strong recovery in development activity in 2025, according to the annual report by Jameson Lopp (Casa). Email traffic on the Bitcoin Development Mailing List increased by 60% compared to 2024, reversing the previous downward trend.
The number of source code contributors also increased, with 135 individuals participating in Bitcoin Core development in 2025, up from about 112 the previous year, ending a multi-year decline. The total code change volume reached approximately 285,000 lines, matching the project’s historical average.
This upward trend occurs as Bitcoin Core completes its first public security audit, with no serious vulnerabilities found, while also witnessing intense debates over mempool policy changes and OP_RETURN limits in release v30. Organizations like VanEck continue to fund development activities.
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