I found the Proof of Work Captcha on Coinhive's signup page to be quite interesting: https://coin-hive.com/account/signup https://coin-hive.com/account/signup

I found the Proof of Work Captcha on Coinhive's signup page to be quite interesting: https://coin-hive.com/account/signup https://coin-hive.com/account/signup https://coin-hive.com/info/captcha-help https://coin-hive.com/info/captcha-help I'm not super familiar with the inner workings of the world of spam protection, but I'm curious if people think increasing the cost of spamming through extra workload for the machine as opposed to the human in this manner would be helpful to deter spammers in general? Seems like the lack of a human intervention requirement means that the spamming workflow can still be automated, but maybe the extra workload could cut into profits/throughput enough to make the site an unattractive target? The other aspect of a solution like this where you can potentially recoup part of the damage done by spamming through their contribution to your mining operation, so you say hire a human moderator, is super interesting as well.