Bitcoin is to be classed as a commodity in the United States along with gold and oil, according to Commodity Futures Trading Commission.<br /><br /> It decision follows a clampdown on unregistered firms which trade derivatives of the crypto-currency.<br /><br /> Bitcoin is a virtual currency that allows users to exchange online credits for goods and services. <br /><br /> While there is no central bank that issues them, bitcoins can be created online by using a computer to complete difficult tasks, a process known as mining.
