45.7K accounts from HoundDawgs (hounddawgs.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsWebsite activity
In December 2017, the Danish torrent tracker known as HoundDawgs suffered a data breach. More than 55GB of data was dumped publicly and whilst there was initially contention as to the severity of the incident, the data did indeed contain more than 45k unique email addresses complete extensive logs of torrenting activity, IP addresses and SHA1 passwords.
Source: Have I Been Pwned (CC BY 4.0)