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2019Nov 1
- Nick Szabo
- In the 1990's DigiCash, headed by David Chaum, attempted to make online payments anonymous.
- In 1997 Adam Back created HashCash using a proof-of-work system to reduce email spam and prevent denial of service attacks.
- In 1998 Wei Dai proposed B-money to allow for an "anonymous, distributed electronic cash system".
- In 2004 Hal Finney built upon the idea of Hashcash and created Reusable Proofs of Work.
- And in 2005 Nick Szabo proposed Bit Gold. Where unforgettable proof of work chains would share properties of gold: scarce, valuable and trust minimised but with the benefit of being easily transactable.
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