Centralized virtual currency

Definition
A centralized virtual currency has

"a single administrating authority (administrator) &mdash; i.e., a third party that controls the system. An administrator issues the currency; establishes the rules for its use; maintains a central payment ledger; and has authority to redeem the currency (withdraw it from circulation). The exchange rate for a convertible virtual currency may be either floating &mdash; i.e., determined by market supply and demand for the virtual currency, or pegged &mdash; i.e., fixed by the administrator at a set value measured in fiat currency or another real-world store of value, such as gold or a basket of currencies. Currently, the vast majority of virtual currency payments transactions involve centralised virtual currencies. Examples: E-gold (defunct); Liberty Reserve dollars/euros (defunct); Second Life "Linden dollars"; PerfectMoney; WebMoney “WM units”; and World of Warcraft gold."