$15M of Optimism Tokens Stolen by an Attacker After Wintermute Sent Wrong Wallet Address

An opportunity for attack came when Wintermute gave the wrong wallet address to Optimism. The money was supposed to be held in a multi-signature wallet belonging to the Wintermute team, but the address provided by Wintermute was for a wallet on Ethereum, whereas it should have been an address on Optimism.