Digital currency founded DigiCash, an electronic cash company, in Amsterdam to commercialize the ideas in his research. It filed for bankruptcy in 1998. In 1999, Chaum left the company. In 1997, Coca-Cola offered buying from vending machines using mobile payments. After that PayPal emerged in 1998. Other systems followed suit, such as e-gold, but it faced issues because it was used by criminals and was closed by U.S Department of Justice in 2005. In 2008, bitcoin was introduced, which marked the start of digital currencies. Origins of digital currencies date back to the 1990s Dot-com bubble. One of the first was E-gold,
Digital gold currency transaction, while PayPal transfers, for example, could be considered more similar to credit card transactions. The advantage of this arrangement is that the operating costs of the digital currency system are greatly reduced by not having to resolve payment disputes. Additionally, it allows digital gold currency transactions to clear instantly, making the funds available immediately to the recipient. By contrast, credit cards, checks, ACH and other reversible payment methods generally have a "clearing time" of 72 hours or more. As with all financial media, there are several types of risk inherent to the use of DGCs: management risk, political risk,