Wintermute published a blog post taking responsibility for the error, and announced that they would "proceed to buy OP every time the attacker sells it to make the protocol whole eventually". So far the attacker has sold 1 million $OP for about $1 million USD.
Wintermute wrote that they were "open to see this as a white hat exploit", but if the funds were not returned within a week, they were "100% committed to returning all the funds, tracking the person(s) responsible for the exploit, fully doxxing them and delivering them to the corresponding juridical system".
Remarkably, the attacker returned 17 million of the tokens two days later, keeping 2 million as a "bounty". Wintermute agreed to reimburse the Optimism Foundation for the remaining 2 million $OP.
