PANews reported on May 15 that Sonne Finance announced that its Optimism protocol suffered a known donation attack, resulting in a loss of approximately $20 million. The attack exploited a vulnerability in a newly added market. Within two days of the market's creation, the attacker used a multi-signature wallet and time-lock function to execute key transactions and successfully manipulated the market's collateral factors (c-factors). Although the Sonne team quickly organized a response after the attack and suspended the market within 25 minutes of discovering the problem to reduce further losses, approximately $6.5 million in funds were retained. The Sonne team is working hard to track down the attacker and has offered a bounty to the attacker, hoping that he will return the funds to avoid further investigation. At the same time, the Sonne team sincerely apologizes for the incident and is contacting all possible partners to work hard to recover the funds.