You can read more at the WP Hashcash plugin page. WP Hashcash is 100% GPL compatible.
WP Hashcash relies on the presence of two hooks in your theme,
comment_form. If your theme doesn't include these actions, you will need to add them immediately before the end head and end form tags respectively.
Requires: 3.1 or higher
Compatible up to: 3.3.2
Last Updated: 4 years ago
Active Installs: 2,000+
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