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- The hashcash tool allows you to create hashcash stamps to attach to
- emails you send, and to verify hashcash stamps attached to emails you
- receive. Email senders attach hashcash stamps with the X-Hashcash:
- header. A hashcash stamp constitutes a proof-of-work which takes a
- parameterizable amount of work to compute for the sender. The
- recipient can verify received stamps efficiently.
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