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Incident information

Are You a Chainalysis Customer? Learn About Your Options After the October 2026 Security Incident

Information about this incident and a simple way to see if you may qualify to be connected with independent attorneys.

What happened

Chainalysis Inc., a U.S. blockchain analytics and compliance platform, published a series of updates beginning October 30, 2026 about a multifront cyberattack against its systems. On November 4, 2026 the company confirmed that certain customer information—including names, usernames, password hashes, and live tokens for all Chainalysis users—was exposed to a malicious actor.

According to Chainalysis’s official incident page and contemporaneous reporting:

Customer information including names, usernames, password hashes, and live tokens for all Chainalysis users was exposed
A subset of customer passwords was also exposed through an “on-path attack,” which the company says has been contained
Chainalysis required password resets and API-key rotation and temporarily took products such as KYT and Address Screening offline while restoring access in phases
The company has stated it continues to have no evidence that investigation graph data or attribution repositories were accessed or manipulated
Some customers whose KYT accounts appeared accessed without authorization were notified separately

Chainalysis has not published a total number of affected individuals. The notice is directed at Chainalysis platform users and customer organizations.

If you are, or were, a Chainalysis customer or user and received a notice about this incident, you can see if you may qualify to connect with an independent attorney.

Possible remedies

Possible remedies, if any, depend on the facts of your situation and applicable law. No outcome or payment is guaranteed.

Official source

Read the original public notice or report about this incident (opens in a new tab):

https://www.chainalysis.com/blog/security-incident-october-30/

See if you may qualify

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