Bitcoin experiences price volatility and remains an uncertain commodity in terms of taxation and legality. Read more about By Eric Rosenberg. While this is platform offers a huge range of currencies at a low cost, there are some bugs reported with the Android mobile app and some users have reported delays withdrawing certain currencies. The limited size of the industry is a problem, as a number of firms have already gone out of business, while others never even started shipping their products. A private key should be a guarded secret and only used to authorize bitcoin transmissions. There are many well-established exchanges that provide one-stop solutions with high security standards and reporting, but due diligence should be exercised when choosing a bitcoin exchange or wallet.