Nansen third-party security breach exposes 6.8% of user emails and some blockchain addresses

Quick Take

  • One of Nansen’s third party vendors was compromised.
  • This led to a portion of user emails and password hashes exposed.

Crypto analytics platform Nansen disclosed that one of its third-party vendors was compromised, leading to the loss of emails, password hashes and some blockchain addresses.

The breach impacted 6.8% of its users, who had their emails exposed, according to a post on X. Nansen said a portion of these users also had hashes of their passwords exposed and an even smaller group had their blockchain addresses revealed too.

Nansen said that the breach resulted in the attacker gaining admin access to an account that was used to provide customer access to its platform. 

It didn't name the third-party vendor but encouraged it to publicly disclose the breach.

The company has contacted affected users and encouraged its users to change their passwords and to be wary of phishing attacks.


© 2025 The Block. All Rights Reserved. This article is provided for informational purposes only. It is not offered or intended to be used as legal, tax, investment, financial, or other advice.

AUTHOR

Tim Copeland is the Head of Growth at The Block and host of The Crypto Beat, a live-streaming podcast. He was previously the company's Editor-in-Chief and spent seven years covering the industry as a journalist. Prior to joining The Block, Tim was a news editor at Decrypt. He earned a bachelor's degree in philosophy from the University of York and studied news journalism at Press Association Training. Follow him on X @Timccopeland.

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