The base currency – BTC. The counter currency – USD. The BTC/USD rate mirrors the relationship between Bitcoin and the American Dollar. Bitcoin is a non-government system of money, devised in reaction to the financial crisis of 2008. This cryptocurrency relies on blockchain technology, meaning every bitcoin transaction is recorded on a special database rather than controlled by a particular financial institution. The BTC/USD is regarded as the most popular bitcoin pair in the world, largely owing to the central role the dollar plays in global finance. Browse the BTC/USD chart in real time and stay tuned to the cryptocurrency phenomenon.