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Event August 15, 2010 Added February 22, 2026 Updated October 13, 2026 Article

Value overflow incident — 184 billion BTC created in Block 74638

Jeff Garzik ↔ Satoshi Nakamoto, Gavin Andresen

An integer overflow (CVE-2010-5139) let Block 74638 create 184 billion BTC. Satoshi released a fix 5h 40m after discovery; the fixed chain overtook the bad one about 15 hours after the block.