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This idea is also known as a CPU cost function, client puzzle, computational puzzle, or CPU pricing function. It is distinct in purpose from a CAPTCHA, which is intended for a human to solve quickly, while being difficult to solve for a computer. Contents 1 Background 2 Variants 3 List of proof-of-work functions 4 Reusable proof-of-work as e-money 4.1 Bitcoin-type proof of work 4.2 Energy consumption 5 ASICs and mining pools 6 See also 7 Notes 8 References 9 External links...