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In 1997, I invented hashcash originally as a general proof-of-work system with applications for anti-DoS via the creation of computationally expensive to create but fast to verify electronic stamps. Applications included deterring anonymous remailer DoS, email spam, blog spam, pseudonym name-squatting etc. Hashcash was proposed for mining by pre-bitcoin ecash systems b-money in 1998 by Wei Dai, bit-gold in 1998 by Nick Szabo and RPOW in 2005 by Hal Finney and later Bitcoin in 2008 by Satoshi Nakamoto.