I think our government knows about bitcoin because there are some banks here now accepting bitcoin and they are connect bitcoin to them meaning the government approved it.
Yeah i think major world super powers is already much familiar with the use and trading with bitcoins but have not yet issue any sort of rules for it because the people here in our country are earning handsome amount of money through it and contributing a lot in the economy of the country so i dont think they will stop doing trading or investing in cryptocurrency.