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 but PX-Gold never came into existence. Account holders never recovered their funds. Digital gold systems are completely dependent on electronic storage and transmission of account ownership information. Therefore, the security of a given digital currency account is dependent upon the security of the issuer as well as the security of the accountholder's computer. While the digital gold issuers employ data security experts to protect their systems, the average accountholder's computer is poorly protected against malware (trojans, worms and viruses) that can be used to intercept information used to access the user's DGC account. Therefore, the most common attacks on digital