Chainalysis restores core tools after login data exposure

Chainalysis has restored its main screening tools after a security incident exposed login data for all users, according to CryptoSlate. The blockchain analytics firm, whose products are used for crime tracking across chains including Solana, Base and Ethereum, said it brought Reactor and its screening products back online on Nov. 7, telling customers by email that reconnecting would require enhanced security steps. CryptoSlate reports that Reactor, the Investigations API and Address Screening were confirmed operational as of Nov. 7, while two investigation services remained under maintenance as of Nov. 9.

The exposure was first disclosed on Oct. 30, when Chainalysis said accessed data included user IDs, names, email addresses and organization role labels, per CryptoSlate's earlier coverage. A later update on Nov. 4 widened that disclosure: the company said it had found on Nov. 2 that names, usernames, password hashes and active login tokens were also exposed, and that abnormal activity on Nov. 4 led it to pull some services offline.

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CryptoSlate notes it remains unclear whether every user account was actually accessed by the unidentified attacker, and whether investigation or attribution data was touched despite Chainalysis's statement that it found no evidence of that. No timeline has been given for restoring the two remaining services.