I bought shares of GBTC for bitcoin exposure and RIOT for block chain exposure and they have both skyrocketed since September, RIOT is up over 500%, GBTC about 200%. Great ways to make a mint without owning BTC. I own a small amount of BTC and don't plan owning more, I've read too many horror stories of people literally losing millions because they lost their device or can't find/remember their passphrase.