freebsd-ports/mail/hashcash/pkg-descr

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The hashcash tool allows you to create hashcash tokens to attach to
emails you send, and to verify hashcash tokens attached to emails you
receive. A hashcash token constitutes a proof-of-work which takes a
parameterizable amount of work to compute for the sender.
Author: Adam Back <adam@cypherspace.org>
WWW: http://www.hashcash.org/