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You can convert into Bitcoin (BTC) or Bits, the two most popular scales of the moment. Reminder: 1BTC = 1.000.000 BITS. You can convert into Euro or Dollar. (but also Real, Yuan, Pound, Rupee). It is possible to know the balance of an address by entering it in one of the fields.
The ISO 4217 currency code for Bitcoin is XBT. However, at the moment it is an unofficial code according to the ISO 4217 standard. The unit name BTC is also commonly used to represent one bitcoin, but it violates ISO 4217 because it begins with BT, the country code of Bhutan.