568K accounts from BTC-E (btc-e.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Account balancesEmail addressesIP addressesPasswordsUsernamesWebsite activity
In October 2014, the Bitcoin exchange BTC-E was hacked and 568k accounts were exposed. The data included email and IP addresses, wallet balances and hashed passwords.
Source: Have I Been Pwned (CC BY 4.0)