Litecoin's foundation called the weekend exploit a zero-day. The litecoin-project GitHub repository shows the consensus vulnerability was privately patched between March 19 and 26, more than four weeks before the attack. Attackers exploited a previously patched but not fully deployed vulnerability in Litecoin’s Mimblewimble Extension Block protocol, triggering a 13-block chain reorganization that rewound about 32 minutes of activity. Public GitHub commits show the core consensus bug was pr…
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