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A comment on Proof of work - an unobtrusive alternative to captchas.
http://www.hashcash.org/
http://drupal.org/project/hashcash
http://wordpress.org/extend/plugins/wp-hashcash/
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http://www.hashcash.org/
http://drupal.org/project/hashcash
http://wordpress.org/extend/plugins/wp-hashcash/