Bitfinex told OCCRP the analysis was “incomplete” and “incorrect” and that there was “evidence of negligence…on the part of other counterparties that led to the hack.” Bitgo declined to comment. Ledger Lab did not respond to a request for comment.

The hacker covered their tracks with a data destruction tool, used to permanently delete logs and other digital artifacts that might have identified the initial entry point into Bitfinex systems, meaning it’s not clear how they got into the exchange’s systems, only the security…