https://hackepedia.org/index.php?action=history&feed=atom&title=HashcashHashcash - Revision history2026-05-08T22:31:30ZRevision history for this page on the wikiMediaWiki 1.45.3https://hackepedia.org/index.php?title=Hashcash&diff=1846&oldid=prevRoy at 05:01, 10 October 20052005-10-10T05:01:07Z<p></p>
<p><b>New page</b></p><div>[[Hashcash]] is a "proof of work" system originally designed as an anti-spam measure. [[Hashcash]] tokens are "minted" by finding a [[hash collision]] for a unique input string. The result is included in the header of an email message as "proof" that the sender has done a certain amount of work to "pay for" the delivery of the message. A 20-bit collision may take only a fraction of a second to compute, depending on the computer system. 25 bits on the same system would take 11 seconds, and 30 bits would take over 6 minutes. The recipient determines how much work is required to pay for delivery.<br />
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The idea behind [[hashcash]] is that a legitimate email sender can easily afford a few seconds to mint a stamp for an outgoing email, but spammers who want to send millions of emails would be bogged down.<br />
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The [[hashcash]] project may be found [http://www.hashcash.org here].</div>Roy