Ok after i disable my Web Malwarebytes protection i tested this new " coinhive proof of work "
The positive side of it is the fact that your eyes will hurt no more trying to complete captchas !
The very negative side of it : 1) If you " claim "
Every 5 freaking minutes will bring your CPU to 100 % for like 10 seconds 2) then again to CPU 100 % for another 10 seconds after you press claim!
Good luck playing a game or doing anything else on that PC during this time... I can understand the 10 sec after claim since captcha was also about that but the 10 sec after the 5 min are horrible because if you do anything else on your PC during that time and you leave
http://claimbtc.in open in your browser your game or work will be interrupted for sure...
What i suggest to the owner of the site is to only take 10 maybe 20 % of a cpu after those 5 mins and 100 % ONLY after someone press the " claim " button.
This way would be not only fair but also much less annoying for the site users. Imagine interrupting someone work / game on his PC every 5 min .... (you will make this site worth only for users keeping their PC idle ?)