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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.
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.that the code commits to Bitcoin Core, essentially updates to the codebase, increased by 1% over the year to 2,541, continuing an uptrend since 2023 after a decline from a peak of nearly 3,500 in 2021. The email volume to the Bitcoin Development Mailing List, a major hub for communicating and hashing out changes to the network, alsoThe metric upswings caps a big year for Bitcoin Core development activity, which included debate over the OP_RETURN data limit, whichthird-party security audit in November, with the security firm Quarkslab finding that the software running the blockchain was “mature and well-tested” with no high or medium-severity vulnerabilities.
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