Bitcoin Core's development activity significantly increased in 2025, reversing years of decline

According to TheBlock, Bitcoin Core's development activity saw significant growth in 2025, reversing years of decline.

Casa's Chief Security Officer Jameson Lopp released annual data showing that Bitcoin Core's mailing list traffic increased by 60% year-on-year, with a total of 135 independent code contributors participating in development. The amount of code changes reached approximately 285,000 lines, reversing the continuous decline since 2018, when the number of contributors peaked at around 193.