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👨‍💻 Launch of Bitcoin v0.5.0 Bitcoin-Qt version 0.5.0, released on November 21, 2011, introduced a major graphical overhaul using the Qt user interface toolkit, along with several GUI, RPC, and general improvements like faster initial block downloads. Crucially, this release included a major security fix (CVE-2011-4447) that corrected a flaw in the wallet encryption feature. https://bitcoin-calendar.org/en/events/2011-11-21/launch-of-bitcoin-v05