Comment 1 for bug 1679264

I could but, exchange rate will not work and this may introduce other issues,
adding to this:
- There is no official ISO currency code for Bitcoins, although XBT is commonly used
- Notice: Bitcoin is not legal tender in any country and is not recognized as an official currency by any regulatory authority. XE does not endorse nor express an opinion as to whether or not Bitcoin is an official or legitimate currency

source:
http://www.xe.com/currency/xbt-bitcoin