Module for WP Hashcash

I have created a Contact Form 7 “module” for integrating WP hashcash spam protection with Contact Form 7. It allows users to add a tag [wphc] that adds the spam protection to a contact form. It only works if WP Hashcash plugin is installed. Please consider my contribution for inclusion in Contact Form 7:

Module: http://abdussamad.com/files/2012/11/hashcash.php_.zip
WP Hashcash: http://wordpress.org/extend/plugins/wp-hashcash/

http://wordpress.org/extend/plugins/contact-form-7/