The National White Collar Crime Center (NW3C) recently released an online training course on virtual currency.  The 30-minute course covers basic information and concepts that serve as an introduction to virtual currencies and their relationship to other types of currency.  It covers various types of virtual currency, including the difference between decentralized and centralized currencies, with a strong focus on Bitcoin: what it is, how it is stored, and Bitcoin-specific investigative tips and techniques.  Individuals must have an NW3C online learning account and be employed by a law enforcement organization to access the no-cost training.