Mt. Gox 'Flash Crash' to $0.01

On June 19, 2011, the Bitcoin world witnessed its first major exchange catastrophe. A hacker gained access to a compromised computer belonging to a Mt. Gox auditor (specifically Jed McCaleb's old administrative account), which provided direct access to the exchange's user database and trading engine. The attacker used this access to artificially lower the nominal price of Bitcoin within the exchange to $0.01 and then utilized the compromised account to 'buy' thousands of coins at this rock-bottom price. Simultaneously, a massive sell order was executed to clear out the order book, causing the public price ticker to plummet from $17.50 to a single penny in minutes.

The 'Flash Crash' caused widespread panic. Although the Bitcoin protocol itself was secure, the centralized infrastructure layer had failed spectacularly. The hacker managed to withdraw roughly 2,000 BTC before Mt. Gox pulled the plug on the server, though they attempted to withdraw far more, hitting the exchange's $1,000 daily withdrawal limit. In the aftermath, Mt. Gox rolled back trades to the state prior to the hack—a controversial decision that saved users from losses but violated the ethos of immutability. The site remained offline for a week to rebuild security.

This event exposed the fragility of the 'Gox monopoly.' It proved that while the blockchain was decentralized, the access points were dangerously centralized. The breach also leaked the exchange's user database (usernames, emails, and hashed passwords), leading to a wave of secondary hacks on other services (like MyBitcoin) where users had reused credentials. It was a brutal lesson in exchange security that ended the euphoria of the June bubble and began the long 'bear market' of 2011.

Key Sources: BitMEX Research: 2011 Flash Crash Analysis | Wired: Bitcoin Collapse