[Significant Growth in Bitcoin Core Development Activity in 2025, Reversing Years of Decline] BlockBeats News, January 5: According to a report by TheBlock, Bitcoin Core saw significant growth in development activity in 2025, reversing a years-long downward trend. Casa Chief Security Officer Jameson Lopp released annual data showing that Bitcoin Core mailing list traffic increased by 60% year-over-year, with 135 independent code contributors participating in development. The code changes amounted to approximately 285,000 lines, reversing the continuous decline since 2018, when the number of contributors peaked at around 193.