Proof-of-Stake was printed for Series 2, part of Cardsmiths Currency, a premium collector line tracing the history of money from ancient coinage to cryptocurrency. It was printed in 15 different variants, with Onyx the hardest to find at 1 copies. The illustration is credited to Erica Hesse. This is card 35 on a 74 card checklist.
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Proof-of-Stake is a consensus mechanism for cryptocurrency blockchains where validators of transactions are selected based on the amount of the underlying cryptocurrency they hold.
