Bitcoin Core development activity is expected to rebound in 2025, with an increase in the number of contributors and discussion.

Bitcoin Core saw a resurgence in development activity in 2025. Data compiled by Jameson Lopp, Chief Security Officer at Casa, shows that emails to the Bitcoin developer mailing list increased by approximately 60% year-over-year, with 135 different contributors submitting code to the Bitcoin Core codebase, up from approximately 112 in 2024, ending a multi-year decline since its 2018 peak. In 2025, Bitcoin Core completed its first publicly disclosed third-party security audit, conducted by Quarkslab and funded by Brink, which found no serious vulnerabilities. Regarding funding, VanEck continued to allocate 5% of its spot Bitcoin ETF profits to support Brink's development efforts. (The Block)