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On Sunday, the Chicago Board of Exchange began offering bitcoin futures, allowing investors to speculate on whether the digital currency's price will go up or down. Monday marks the first full day of trading, and it's a historic move. Unlike traditional commodities, bitcoins aren't physical assets and unlike currencies, there isn't a central bank that backs bitcoins. Bitcoins live on computer servers. "Bitcoin is not an asset which can be valued by any traditional financial metrics and basically financial bubbles occur throughout history and really the interesting thing about these bubbles is really what they tell us about societies at the time they occur. And with Bitcoin, I really think it chimes with the sort of collapse in confidence in traditional forms of authority and the traditional financial system," said Miles Johnson, capital markets editor at the Financial Times.