Format Online paper / PDF
Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 8: THE SHIELD OF SCREWTAPE Back With Satoshi

"Adam Back’s Hashcash paper described a CPU cost-function whose token could serve as proof of work."

Back's paper defines a CPU cost-function that computes tokens usable as proof of work, providing an important technical antecedent to Bitcoin.

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Source title Hashcash - A Denial of Service Counter-Measure
Source authors Adam Back
Source year 2002
Confidence high
Importance high
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