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When Satoshi Nakamoto created the digital currency Bitcoin, he also decided there would never be more than 21 million coins. These coins would slowly be released over time, as a reward for those participating in the block creation process for Bitcoin’s underlying blockchain. Satoshi described the “steady addition of a constant of amount of new coins” as “analogous to gold miners expending resources to add gold to circulation”, and noted that “in our case, it is CPU time and electricity that is expended”.