Digital currency destabilizing effect on the Chinese Yuan currency due to speculation. Recent interest in cryptocurrencies has prompted renewed interest in digital currencies, with bitcoin, introduced in 2008, becoming the most widely used and accepted digital currency. According to the European Central Bank's 2015 "Virtual currency schemes – a further analysis" report, virtual currency is a digital representation of value, not issued by a central bank, credit institution or e-money institution, which, in some circumstances, can be used as an alternative to money. In the previous report of October 2012, the virtual currency was defined as a type of unregulated, digital money,
Digital gold currency each of which provides a system that enables users to pay each other in units that hold the same value as gold bullion. These competing providers issue a type of independent currency. Proponents claim that DGC offers a truly global and borderless world currency system which is independent of exchange rate variations and political manipulation. Gold, silver, platinum and palladium each have recognized international currency codes under ISO 4217. Unlike fractional-reserve banking, DGCs hold 100% of clients' funds in reserve as gold, silver, and/or platinum, which can be exchanged via digital certificates. Proponents of DGC systems say that deposits are