According to an official announcement by Umbra (@UmbraCash), the privacy payment protocol Umbra has been used to transfer funds related to a recent hacking incident, involving an amount of 349 ETH (approximately $800,000). Umbra stated that, as its primary function as a privacy address system is to protect the identity of the recipient rather than the sender, its actual assistance in concealing the source of funds for hackers is limited. All related stolen funds can be identified and tracked, and the team has maintained communication and collaboration with security researchers. Umbra also pointed out that the protocol is driven by autonomous smart contracts, and the team cannot prevent anyone from using the contracts or self-hosted front-end versions. In consideration of cooperating with fund recovery efforts, the team switched the hosted front-end to maintenance mode at 6:45 AM Eastern Time on April 21. Access will be restored once it is confirmed that it will not hinder the recovery process. The protocol itself is operating normally, and all funds within privacy addresses remain secure.