Bitcoin Core saw 135 contributors in 2025, up sharply from 2024.
Code changes, commits, and developer discussions all increased year over year.
A record year for Bitcoin and a clean security audit reinforced developer confidence.
Bitcoin developers returned to work in greater numbers during 2025, delivering more code changes and renewed momentum to the software that powers most of the network, according to leading Bitcoiner Jameson Lopp.
Lopp, the co-founder of Casa, said developer participation in Bitcoin Core rose meaningfully last year. A total of 135 individuals contributed code in 2025, up from just over 100 contributors in 2024. The increase extended a recovery trend that began after developer participation dipped following its peak of nearly 200 contributors in 2018.
Developers also pushed more changes into the codebase. He said that in the year, contributors changed 285,000 lines of code, more than 3% over the 276,000 lines changed in 2024. The figures imply dee
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