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On March 25, 1994, Timothy C. May responds to a Cypherpunks mailing list discussion on digital cash, highlighting double-spending as a critical challenge. He proposes online clearing and blinding protocols as potential solutions, though neither fully resolves the issue.
Almost 15 years later, Satoshi Nakamoto shared the Bitcoin whitepaper on the same mailing list, presenting the first complete solution to the double-spending problem.