PANews reports on April 22, according to Cointelegraph, the privacy protocol Umbra has shut down its front-end website to prevent attackers from using the protocol to transfer stolen funds from recent attacks. Umbra stated that approximately $800,000 in stolen funds were transferred through its protocol, but the protocol itself is only meant to protect the identity of the receiver, not the sender; all transferred funds can be identified. This decision comes a few days after the Kelp protocol was attacked (resulting in losses exceeding $280 million, allegedly by North Korean hackers), with reports showing that attackers are attempting to use protocols like Umbra to move funds from Ethereum to Bitcoin. Umbra has put the custodial front-end into maintenance mode, pending confirmation that it will not hinder current recovery efforts before restoring it. However, Umbra cannot prevent anyone from using its smart contracts or the self-hosted version of the open-source front-end.

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