KYT

Chainalysis Breach Exposes Password Hashes, Usernames, Live Tokens and Personal Data of All Customers

Blockchain analysis firm Chainalysis has confirmed that a cyberattack resulted in the exposure of password hashes, usernames, live tokens, and personal information including names and email addresses belonging to every customer. The company initially reported the incident on 30 October 2026, stating at the time that there were no indications attackers had accessed credentials or investigative data. Chainalysis, which provides blockchain analytics primarily to law enforcement agencies investigating cryptocurrency theft and fraud, later disclosed that the attackers had in fact obtained data from all customer accounts. As a direct result, the firm has reset passwords for every user and is notifying those whose Know-Your-Transaction (KYT) accounts were specifically compromised. KYT is Chainalysis' service that enables businesses to monitor cryptocurrency transactions for compliance and risk purposes. The affected services remain offline while the company continues remediation efforts, and the exact method used to compromise the systems has not been disclosed.