Hashcash is a denial-of-service counter measure tool. Its main current
use is to help hashcash users avoid losing email due to content based and
blacklist based anti-spam systems.
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 hashcash stamps efficiently.
- Hashcash .
- Hashcash format info
- Hashcash Paper Aug 02 -
(5 years on),
Tech Report, Adam Back
- The site is slowly moving over to this new domain, some of the content
is still here:
If you have questions are interested to port to different systems, integrate
into different email clients (MUAs), anti-spam systems, or MTAs email Adam
Back or post
on the .
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