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Early reports suggest that this may be somehow connected with Mt. Gox. That's why I want everyone affected to confirm if they have indeed had Mt. Gox accounts with same usernames and passwords as on Bitmarket.
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Sounds like Mt.Gox would save passwords as clear text, not hashes. Hopefully not, do somebody know?
Perhaps the hacker has the account name from Mt.Gox, the password from other sites.