Brandable versions of keywords, however strong, works much better in .com and not that much in other extensions. Bitcoining would be a pretty good brandable in .com, could probably even sell in the mid-high 5 figs, if you are patient enough.
I have altcoining in .com and I really like the name and plan to hold on to it for the right buyer, but bitcoining is definitely a better name as along as its in .com