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 Date: 2016-08-24 14:55:21Cryptography Artificial intelligence Human-based computation Computing Cryptocurrencies CAPTCHA Computer security Computer vision Proof-of-work system Hashcash Challengeresponse authentication Zero-knowledge proof |
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Designing Proof of Human-work Puzzles for Cryptocurrency and Beyond∗ Jeremiah Blocki Purdue University, Hong-Sheng Zhou Virginia Commonwealth University, 
