I recently did a one-click install of WordPress 2.8.1 and the Dreamhost install included the WP Hashcash plugin: http://wordpress-plugins.feifei.us/hashcash/
I’ve now got version 4.3 installed – may have upgraded from the Dreamhost install.
I have it activated, my theme has
just before the tag and
just before the tag in the comments.php file.
However, I can’t see that the plugin is doing anything other than putting its tagline below the form. [I registered as a new user and posted a comment – there wasn’t any challenge of any sort to that.]
Since this “comes with” the Dreamhost install, I thought I’d check here to see if anyone has other info. [The forum on the plugin site has an unanswered question about how/where to put the plugin hooks.]