With 50% of the bitcoin hashrate located behind the Great Firewall of China (GFC), the only way for the NSA to take out the majority of bitcoin miners, consists in operating deep behind the GFC.

According to Edward Snowden, the NSA is already planning on thoroughly disturbing Chinese infrastructure. The Chinese defense response should simply be a long overdue thermonuclear strike on Fort Meade, Maryland. If the Chinese don't do it, then the Russians should.

In fact, it is not in the interest of neither the Chinese nor the Russians to wait until the NSA wreaks havoc on their infrastructure. In terms of their own national security -- as the NSA already attack their population -- they should do the world a favour and launch a thermonuclear strike against Fort Meade right now.