Bitcoin devs flocked back to work amid a big year for crypto

Key metrics tracking the development of Bitcoin Core show 2025 was a good year for the blockchain, with more developers contributing more code, says Jameson Lopp.

Bitcoin developers working on the software that powers most nodes backing the blockchain had a busy year in 2025, with more developers pushing out more code, according to Bitcoiner Jameson Lopp.

Lopp, the co-founder of the crypto management platform Casa, said on Sunday that 135 different people had contributed code to Bitcoin Core last year, rising from just over 100 individuals in 2024 and continuing an uptrend. The number of contributors peaked in 2018 with nearly 200 contributors.

Those developers also changed more code, with Lopp reporting 285,000 lines of code were changed last year, a more than 3% jump from the 276,000 lines of code changed in 2024.

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