Blockchain
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conero: Spending One Note Eight Times Because the Subgroup Check Is in the Wrong Function
A write-up of the blockchain challenge conero from the Codegate 2026 qualifiers, where a patched geth implements Monero-style ring signatures, writes a careful canonical-key-image check, and then verifies proofs in a function that never calls it — so one note yields eight key images and drains the pool.
