It is differed from virtual money used in virtual economies due to its use in transactions with real goods and services; not being limited to circulation within online games. Earlier digital currencies are often backed by a promise to pay a set amount of gold or silver bullion in exchange for each of its units. Others float against whatever individuals are willing to exchange for it.
 FinCen guidanceOn 20 March 2013, the Financial Crimes Enforcement Network (FinCen), a bureau of the United States Department of the Treasury, issued a document providing interpretive guidance to clarify the applicability of the Bank Secrecy Act (BSA) to persons creating, exchanging and transmitting digital or "virtual currencies".
 List of digital currencies
|Currency||Year Est.||Active||Ledger||Website||Monetary base/USD (April 2013)||Bitcoin-based|
|e-gold||1996||No||Gold & Silver Reserve Inc.||e-gold.com||N/A||No|
|Ven||2007||Yes||Hub Culture||venmoney.net||$2 million (est.)||No|
|Bitcoin||2009||Yes||P2P network||bitcoin.org||$2.75 billion (10 April 2013)||N/A|
|NovaCoin||2013||Yes||P2P network||Forum thread||N/A||Yes|
 SafetyMany of these currencies have not yet seen widespread usage, and there is concern that the newer bitcoin based systems may be scams.
 See also
- Other names include: Cryptocurrency, Virtual currency, Payment Scheme, Virtual Medium of Exchange, etc.
- Melik, James. "Digital currency: Brave new world or criminal haven?". BBC News. Retrieved 28 February 2013.
- Chen, Adrian. "The Underground Website Where You Can Buy Any Drug Imaginable". Gawker. Retrieved 28 February 2013. "He entered his address and paid the seller 50 Bitcoins—untraceable digital currency—worth around $150. Four days later the drugs, sent from Canada, arrived at his house."
- "FIN-2013-G001 : Application of FinCEN's Regulations to Persons Administering, Exchanging, or Using Virtual Currencies". Financial Crimes Enforcement Network. March 18, 2013.
- "Bitcoin Exchange Rate in USD". Retrieved 21 March 2013.
- "Market Capitalization". Blockchain.info. Retrieved 21 March 2013.
- "Litecoin Exchange Rate in USD". Retrieved 1 March 2013.
- "NovaCoin Exchange Rate in BTC". BTC-E. Retrieved 1 March 2013.
- "News / Closing the trading of currency pairs, RUC/BTC". BTC-E. Retrieved 1 March 2013.