How big?  There are only sixteen companies in the S&P 500 Index that are bigger.  In a word, stunning:

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Bitcoin explained:   Bitcoin is a digital currency created in 2009. It follows the ideas set out in a white paper by the mysterious Satoshi Nakamoto, whose true identity has yet to be verified. Bitcoin offers the promise of lower transaction fees than traditional online payment mechanisms and is operated by a decentralized authority, unlike government-issued currencies. Today’s market cap for all bitcoin (abbreviated BTC or, less frequently, XBT) in circulation exceeds $7 billion.

More on Bitcoin here: www.investopedia.com

Hat tip Charlie Bilello