Each unit of bitcoin, or 0. This is a form of a wallet that is accessed as a mobile phone app. In selecting the appropriate one for your use, there are factors that you have to consider such as security, convenience, practicability, control, and anonymity. If you do opt to use these and plan to trade in person, make sure to meet in a safe place. In the midst of the turmoil, Bitcoin concept came into being. As the world marks 10 years from the collapse of the Lehman Brothers Investment Bank, it becomes more relevant to think of Bitcoin.