501K accounts from Bitcoin Talk (bitcointalk.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesGendersIP addressesPasswordsSecurity questions and answersUsernamesWebsite activity
In May 2015, the Bitcoin forum Bitcoin Talk was hacked and over 500k unique email addresses were exposed. The attack led to the exposure of a raft of personal data including usernames, email and IP addresses, genders, birth dates, security questions and MD5 hashes of their answers plus hashes of the passwords themselves.
Source: Have I Been Pwned (CC BY 4.0)