34.2K accounts from BitTorrent (bittorrent.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In January 2016, the forum for the popular torrent software BitTorrent was hacked. The IP.Board based forum stored passwords as weak SHA1 salted hashes and the breached data also included usernames, email and IP addresses.
Source: Have I Been Pwned (CC BY 4.0)