Anil Das

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Event March 28, 1997 Added May 1, 2026 Updated November 9, 2026 Article

Adam Back announces Hashcash on the Cypherpunks list — proof-of-work offered as a backstop for digital cash

Adam Back announces Hashcash to the Cypherpunks list — a proof-of-work postage scheme against spam, pitched as a stopgap until digicash spread or a fallback if it failed.