@Dev: If you are using Blizzard graphics to promote this coin, you should have them replaced ASAP. Blizzard graphics are copyrighted. At this point, people are more interested in the coin itself and what it brings to this community. The graphics no longer matter.
I've seen lots of sites and services (big ans small) who use Blizzards artowork but I never heard any of em got sued for it. I feel like its just not Blizzards thing to sue those who somehow bring additional attention to their games. But I agree, I will remove Blizzards artwork after the launch just to play safe
Mineral will you limit by IP or by worker? I hope by IP as it would me much more fair distribution like that
If it's by IP there might be problems with rentals from places like BetaRigs etc. I believe several rigs can be using the same IP. Not 100% sure though.