Bitcoin Core sees development uptick, reversing multi-year decline: Casa CSO

Jameson Lopp, Casa CSO, reported that Bitcoin Core development experienced a notable resurgence in 2025, reversing a multi-year decline. Email volume on the Bitcoin Development Mailing List rose 60% compared to 2024, following a 25% drop the previous year. Furthermore, the contributor base expanded to 135 individuals, up from 112, reversing a trend that saw contributor counts fall from a peak of around 193 in 2018. While the total volume of code changes remained consistent with previous years, the uptick coincides with significant technical milestones, including the completion of Bitcoin Core's first public third-party security audit by Quarkslab and contentious debates leading to the merge of a controversial OP_RETURN policy change in the v30 release. Development funding efforts continue, notably VanEck's pledge of 5% of spot Bitcoin ETF profits to the Brink nonprofit.

(Source：The Block)