Bitcoin saw a healthy amount of developer activity, Casa’s Chief Security Officer noted. In a post on X, Jameson Lopp noted that 135 different people had contributed code to Bitcoin Core in 2025.
In 2024 there were a hundred. The increase reflected that there was a cycle of innovation and not just maintenance.
Furthermore, the Bitcoin Development Mailing List grew by 60% to prove this point.
The number has fallen in the past two years mailing list messages. A revival of activity was encouraging, as it is an important vehicle for proposing and discussing protocol changes.
The Bitcoin Core had also changed 285,000 lines of codereported Lop. There was a 1% increase in code commits year-over-year, reaching 2,541.
The expanded participant base came along with the continued promise of support for the Bitcoin Core. The global investment management company VanEck announced a pledge to donate 5% of Bitcoin [BTC] ETF gains, if approved, to support the developers for the next ten years.
Third-party security audit finds no critical vulnerabilities in Bitcoin
In September, cybersecurity firm Quarkslab completed the first public third-party audit of the Bitcoin Core codebase.
A four-month review of the Bitcoin codebase was funded by the nonprofit Brink, coordinated by the Open Source Technology Improvement Fund (OSTIF).
The goal was to “actively look for vulnerabilities“, Brink revealed. Two low severity issues 13 informative recommendations were found, but no moderate, high severity, or critical vulnerabilities were found.
The report concluded,
“No high impact issues were found, but marginal gains were made on both existing fuzzing harnesses and new ones to cover untested scenarios such as chain reorganization.”
A bullish spark for Bitcoin to start the new year
Source: BTC/USDT on TradingView
The leading crypto’s 4-hour chart showed a bullish structural shift on Friday, January 2. The Ichimoku Cloud indicator has since captured Bitcoin’s continued bullish momentum.
The imbalance between $91.6k and $92.1k was a short-term demand zone. The conversion line stood at $90.5k at the time of writing, marking another major short-term support.
Traders can watch out for a price drop under the cloud that could signal a trend shift.
Final thoughts
- The growing number of contributors over the past two years and the increased number of mailing list posts reflected a resurgence in developer activity.
- Bitcoin’s price was back above the $91,000 level, and sentiment and momentum have increased in January.