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Plugin for CAPTCHA module.

Proof-of-Work will be required to submit form. As a result in order for spammers or bots to submit a lot of spam, they need to spend a lot of CPU cycles which should become not worth it. On top of it most of the spamming software and bots simply can't run JS to do Proof-of-Work at all.

Because of calculation requirements, this module is not compatible with users of Internet Explorer browser version below 10 and might require tuning down complexity parameter for users of browsers other than Firefox and Chrome. lock widget screencast

You will need API keys from

This is a very early release of both pow_captcha module and If you are interested in testing it and have some feedback - feel free to reach me out directly at

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