Note: the article confuses two distinct things wth each other, or at least makes it unclear: the transaction volume that is allegedly dominated by high-speed tr

Note: the article confuses two distinct things wth each other, or at least makes it unclear: the transaction volume that is allegedly dominated by high-speed traders is in the forex market, with people trading a promise to e.g. USD, EUR and Yuan for a promise to bitcoins. Only when someone withdraws his Bitcoin promise does it become a transaction on the blockchain. Until then it's just an exchange saying it owes you a certain amount of bitcoins. This becomes evident when an exchange defaults on this promise because of e.g. a hack, as has been the case with Mt. Gox, Bitfinex, Bitfloor and many others.