Have you looked at Bitshares Openledger? They let you buy and sell OPEN.STEEM that you can then turn into anything of your choice via a service called Blocktrades. You own your own wallet in form of a "brainkey". The Openledger network run on a MIT designed blockchain dubbed Bitshares and is backed by BTS (underlying currency is Bitshares) i am coindup-hasho on OL
use my referral link https://bitshares.openledger.info?r=coindup-hasho