>> bill coin futures set to begin trading for the first time tomorrow evening. digital currency has been rallying at phenomenal speed this year. deidre bolton has details. >> bitcoin launched in 2009 after the global credit crisis when many people lost faith in government and the financial system. from a practical standpoint bitcoin is digital currency, no government guarantying it, no central bank printing it. it is peer-to peer software system that mimics what cash does in the physical world. every bitcoin is signed in open ledger constantly updated across every participating computer's program in a public spreadsheet maintained by its users that's called the block chain. as for bitcoin safety whether or not you should buy it, most experts say not without a strong stomach. >> bitcoin is a safe as you can make it. there are elements of it that make it extremely safe and extrially transparent but there