Nah, IRS wouldn't need DHS to do their dirty work. DHS being involved means someone thinks they are funding terrorists or some other national security threat. Or, at least, that's the excuse they'll have to use to explain DHS's involvement should this turn out to be a conspiracy by the US government to eliminate a competing currency that they can't control.

Figures this would happen on the same day I got my new GPU and tripled my hash rate.