Double Spend is catalogued under Series 4, a set in Cardsmiths Currency, a premium collector line tracing the history of money from ancient coinage to cryptocurrency. It sits at number 46 in a set of 99. There are 21 variants of it to chase, with Onyx the hardest to find at 1 copies. The art is by Aaron Mentzer.
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Double spend refers to the risk in digital currency systems where a single digital token can be spent more than once. This problem can be solved with blockchain, which uses incentives, timestamps, and other features to prevent double spending.
