This is ridiculous. If any of these crypto currencies became a significant way to hide wealth from the government, all the government has to do is make the crypto currency illegal to use or hold. If the US did this, it could easily pop the speculative bubble in crypto coins, and your wealth would vanish.
US was able to force FATCA on other countries, creating a similar law crypto will kill all crypto<->fiat exchanges that don't follow anti-money laundering laws.
