http://blogs.wsj.com/moneybeat/2014/08/18/bitbeat-a-bitcoin-flash-crash-as-volume-spike-briefly-takes-price-to-309/All of that took place on the BTC-e exchange; the low on Bitstamp was $445. The low on CoinDesk’s index was $435. It’s currently at $458.77. On BTC-e, the most recent trade went off at $443.99.
BTC-e is an opaque exchange – It’s not clear whether it’s located in Bulgaria or Cyprus, and the people running it keep themselves out of the public eye. The site notes its located in a “European time zone (GMT +2), which includes both locales. Our colleagues at MarketWatch described it as a “black hole” in a February profile, even as it became one of the biggest of the bitcoin exchanges.