Do your research. In practice, this means the data beyond all comes from BraveNewCoin. Leverage works by using a deposit, known as margin, to provide you with increased exposure. The bitcoin return calculator uses data from BraveNewCoin via Quandl as well as historical bitcoin return data from Bitcoinity. Flags a CPI adjustment on the return and investment fields. It is only accurate to 8 significant figures. Bitcoin as a Speculative Investment Bitcoin is a speculation, but potentially lucrative.