It wouldn’t take much for the United States government to become an investor in bitcoin like it is in gold — the question is whether it would do its citizenry any good. Why it matters: The idea’s being touted by President-elect Donald Trump, and seems to be catching on. Catch up quick: There’s two big proposals out there for committing the U.S. to the world’s biggest cryptocurrency, and both of them were introduced the same day in July at the…