I'd been toying with this idea for a while, and finally found a weekend to hack it out.
There still plenty more to do (make the captcha harder to parse, manual whitisting, reporting, etc) but I thought it was a cool enough idea to share even at an early stage.
There still plenty more to do (make the captcha harder to parse, manual whitisting, reporting, etc) but I thought it was a cool enough idea to share even at an early stage.