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 use of the digital currency for daily monetary transactions, even though most of their normal income and expenses are denominated in the national currency of their home country. Fluctuations in the value of gold against their national currency can create some confusion and difficulty for new users as they see the "value" of their DGC account fluctuate in terms of their native currency. In contrast to exchange risk, caused by gold's fluctuation against national currency, the purchasing power of gold (and therefore DGCs) is measured by its fluctuation against other commodities, goods and services. Since gold has historically been the