 By contrast, a digital currency that is issued by a central bank is defined as "central bank digital currency".In 2012, the European Central Bank (ECB) defined virtual currency as "a type of unregulated, digital money, which is issued and usually controlled by its developers, and used and accepted among the members of a specific virtual community".In 2013, US Financial Crimes Enforcement Network (FinCEN), a bureau of the US Treasury, in contrast to its regulations defining currency as "the coin and paper money of the United States or of any other country that [i] is designated as legal tender and that [ii] circulates and [iii] is customarily used and accepted as a medium of exchange in the country of issuance", also called "real currency" by FinCEN, defined virtual currency as "a medium of exchange that operates like a currency in some environments, but does not have all the attributes of real currency".