100k diff -> 100000/120 H/s = 833 H/s. A typical CPU can get ~10-15 H/s, so this translates to some 50-80 CPUs from July 2012 to February 2014 (see
graph). Of course, some people have more than 1 CPU so it's hard to know how many holders there are.
If you're going to mention the graph, for pretty much all of 2013 (or at least what claims to be 2013) it was well below 100k, more like 30-50k, which is roughly 20-40 PCs, or a smaller number of powerful workstations or servers. Only in late 2013 did it get as high as 100k. That is not a released coin being widely used by some large secret community in the deep web or anywhere else. It is at best a small group of developers.
