Casascius Coin comes from Series 5, a set in Cardsmiths Currency, a premium collector line tracing the history of money from ancient coinage to cryptocurrency. The art is by Rachid Lotf. Of the 167 cards in the set, this is number 29. It exists in 25 variants, and Onyx is the tightest of them at 1.
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Casacius Coins are physical representations of Bitcoin created by Mike Caldwell in 2011. Each coin contains a private key hidden under a tamper-evident hologram, allowing the holder to access the Bitcoin stored within. Popular among early Bitcoin enthusiasts as a tangible way to hold and trade the cryptocurrency, production of Casascius Coins was halted in 2013 due to regulatory concerns.