Bitcoin Core development activity rebounded in 2025, with the number of emails on the main developer mailing list increasing by 60% year-over-year to 285,000 lines of code changes. The number of contributors expanded to 135, reversing a decline that had persisted for years. That year, security audits were completed, and the controversial v30 update was implemented, removing the OP\_RETURN data limit.
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Bitcoin Core development activity rebounded in 2025, with the number of emails on the main developer mailing list increasing by 60% year-over-year to 285,000 lines of code changes. The number of contributors expanded to 135, reversing a decline that had persisted for years. That year, security audits were completed, and the controversial v30 update was implemented, removing the OP\_RETURN data limit.