Hashcash

领测软件测试网 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 FAQ.
• Hashcash format info
• Hashcash Paper Aug 02 - "Hashcash - A Denial of Service Counter-Measure" (5 years on), Tech Report, Adam Back
• The site is slowly moving over to this new domain, some of the content is still here: http://www.cypherspace.org/hashcash/

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 [email protected] or post on the hashcash-list.

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