Decred inflation bug exploited to mint 2,077.97 DCR; network opts against rollback
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Decred disclosed an exploited long-standing consensus inflation bug that minted ~2,078 DCR via edge-case doublespend behavior, with no chain rollback planned. While the amount is small and does not change the stated 21M cap, the incident highlights consensus-risk and upgrade-response gaps, potentially pressuring confidence in smaller L1 security assurances. Broader crypto impact should be limited, but it reinforces protocol-risk sensitivity across the sector.
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Decred said an inflation flaw on its mainnet was exploited between Aug. 16 and Aug. 17, leading to the unauthorized minting of about 2,077.97 DCR, Huoxing Finance reported.
The issue dates back to Decred's February 2016 mainnet launch and originated in consensus logic handling edge cases between the regular transaction tree and the stake transaction tree. Under certain conditions, it enabled double-spending of inputs.
The vulnerability was submitted through the project's bounty program on Aug. 12, but it was exploited before a fix was deployed. Decred said it will not roll back the blockchain, citing the need to limit disruption to users.
Decred added that the roughly 2,000 DCR created does not alter its 21 million supply cap and is far smaller than prior subsidy shortfalls tied to missed votes and other factors, which have exceeded 215,000 DCR.
In response, the team has built an additional double-spend monitoring service and said it will strengthen its emergency upgrade signaling mechanism.
