In June 2011, the largest Bitcoin online exchange was hacked and 400,000 Bitcoins - worth around US$9 million (Dh33m) - were stolen. The thief then flooded the market with stolen Bitcoins, causing the value of a single Bitcoin to fall to $0.01.
*Faceplams* at the mtgox hack.
Press need a clear up about the mtgox hack,
no way 400.000 BTC were stolen in june 2011. Those bitcoins didn't exist, it was just a variable inside mtgox compromised code. A newcomer hearing that ~6% (at the time) of a new currency are in the hands of one thief or that so many bitcoins could be sold at once (and crash the price) may hinder adoption. It simply didn't happen.
Source:
https://mtgox.com/press_release_20110630.htmlII. Bitcoin Sell-Off
On June 20th at approximately 3:00am JST (Japan Time), an unknown person logged in to the compromised admin account, and with the permissions of that account was able to arbitrarily assign himself a large number of Bitcoins, which he subsequently sold on the exchange, driving the price from $17.50 to $0.01 within the span of 30 minutes. With the price low, the thief was able to make a larger withdrawal (approximately 2000 BTC) before our security measures stopped further action.
We would like to note that the Bitcoins sold were not taken from other users’ accounts—they were simply numbers with no wallet backing. For a brief period, the number of Bitcoins in the Mt. Gox exchange vastly outnumbered the Bitcoins in our wallet. Normally, this should be impossible. Unfortunately, the 2000 BTC withdrawn did have real wallet backing and they will be replaced at Mt. Gox’s expense. Again, apart from the compromised admin account, no individual user’s account was manipulated in any way. All BTC and cash balances remain intact.
What about a currency that isn't backed and controlled by a government and central bank but is instead controlled by all of us? And that doesn't exist in messy, resource-consuming, inconvenient physical form, but is digital? Welcome to the virtual currency age.
I liked that part.