This article is a little misleading. It should have set out at the early part what it means by currency in the article. It kind of follows a logic that the basis for the ranking is only the total value, which is not really reasonable. Basically, the article talks of values in USD and that makes the whole article not solely about currency but about market value. Bitcoin is rising in market value primarily because of demand and not because of its adoption as designed. The currency side of the coin is still questionable as there is very little portion of its total supply that is actually used as a currency or a medium of exchange when purchasing goods and services.