>>20That's the point of the link system, no need for javashit, since it will be all server based authentication by following links. If you want the client to do the work, then for that use any of the other third party tools/VMs (java, flash, silverlight,haXe,fuck_off).
Right now on current captcha based systems, you are using javashit, images, music, and a lame cookie. All of these can be delivered to another person to solve, instead of the requester. With a link based system that has false positives, it would prevent a bunch bots from getting subscriptions.
Please note, this is NOT for us. This is only for subscription based services.