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Reusable Proof-of-Work (RPOW) was invented by Hal Finney intended as a prototype for a digital cash based on Nick Szabo's theory of collectibles. RPOW was a significant early step in the history of digital cash and was a precursor to Bitcoin. Although never intended to be more than a prototype, RPOW was a very sophisticated piece of software that would have been capable of serving a huge network, had it caught on.