479K accounts from Coinmama (coinmama.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In August 2017, the crypto coin brokerage service Coinmama suffered a data breach that impacted 479k subscribers. The breach was discovered in February 2019 with exposed data including email addresses, usernames and passwords stored as MD5 WordPress hashes. The data was provided to HIBP by white hat security researcher and data analyst Adam Davies.
Source: Have I Been Pwned (CC BY 4.0)