Bitcoin core development activity surges significantly in 2025, ending years of decline

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On January 5, 2025, the Bitcoin development ecosystem experienced a significant revival, with activity on Bitcoin Core increasing substantially, ending a long period of stagnation since the late 2010s. Data shows that discussions on the Bitcoin developer mailing list increased by approximately 60% year-over-year, serving as a key indicator of the development rebound; a total of 135 independent code contributors participated in protocol optimization throughout the year, marking a notable expansion in developer scale. Technically, 2025 saw the first third-party security audit of Bitcoin in history. The audit was conducted by cybersecurity firm Quarkslab and funded by the nonprofit organization Brink, focusing primarily on the peer-to-peer network layer. The conclusion stated that the codebase is “mature and thoroughly tested,” with no serious or high-risk vulnerabilities found. This result significantly boosted confidence among institutional and sovereign-level participants in Bitcoin infrastructure. Additionally, Bitcoin Core v30 introduced mempool policy updates, including adjustments to OP_RETURN data limits, promoting the development of native Bitcoin applications and sparking widespread discussion about the long-term impacts of on-chain data storage. In terms of funding, 2025 saw a marked increase in institutionalized support for open-source Bitcoin development. Funding pools from organizations such as Brink, Btrust, and OpenSats expanded, and some spot Bitcoin ETF issuers began to formally “give back” to the underlying infrastructure, with VanEck continuing to pledge 5% of ETF profits to support development. This shift reduced core maintainers’ reliance on volunteer models. Moving into 2026, development focus has shifted to scalability of the Lightning Network and enhancing privacy through Silent Payments. Analysts believe that Bitcoin is evolving from a “static store of value” into a financial infrastructure platform capable of continuous evolution.

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