Anything can be used for money in the right circumstances. Gold, silver, stone, paper, debt and cigarettes were used as money. The rich and often used paper stocks in the form of money. In the case of BitShares there are many different assets that can be used as money, including BTS, BitDefender, BitGold and BitSilver. All assets are property that can be replaced, disassembled, transported and can not be tampered with.