Kraken is probably one of the more accessible and easiest methods for US based peeps (like myself). I'm so thankful that our powerful overlords in Mordor on the Potomac who sit in the shiny tower of the SEC know how I can best risk and spend my money. It always feels good to have their bindings of government keeping me safe.
RE: Shorting Cryptocurrencies: Why it is important and why you should do it