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Crypto Score 35 Bearish

Umbra Disables Interface to Block Movement of Stolen Kelp Protocol Funds

Apr 22, 2026 06:11 UTC
ETH, BTC
Short term

Privacy protocol Umbra has taken its front-end website offline to hinder hackers moving stolen assets. The move follows a massive exploit of the Kelp protocol suspected to be linked to North Korean actors.

  • Umbra front end disabled to stop movement of stolen funds
  • Approximately $800,000 in stolen assets moved via Umbra
  • Linked to the $280 million Kelp protocol exploit
  • Suspected involvement of sanctioned North Korean hacking groups
  • Smart contracts remain operational despite UI shutdown
  • Legal precedent from Tornado Cash suggests UI control implies protocol control

Umbra has placed its hosted front-end interface into maintenance mode to obstruct hackers attempting to move funds stolen in recent high-profile exploits. The protocol reported that approximately $800,000 in stolen assets had already been routed through its system before the action was taken. This decision follows a significant breach of the Kelp protocol, where over $280 million was stolen. Intelligence suggests the attack was orchestrated by North Korean hacking groups, which are subject to heavy US sanctions. Umbra was identified as one of the protocols the attackers attempted to use to bridge assets from Ethereum to Bitcoin. Despite the UI shutdown, Umbra clarified that it cannot prevent the use of its underlying smart contracts or self-hosted versions of its open-source front end. The protocol emphasized that its design is intended to protect the receiver's identity rather than the sender's, meaning the trail of stolen funds remains identifiable for security researchers. The move has drawn comparisons to the Tornado Cash legal battle. Roman Storm, co-founder of Tornado Cash, warned that simply disabling a front end may not satisfy regulators. Storm, who was convicted of conspiring to operate an unlicensed money transmitting business, noted that authorities often view the ability to modify a user interface as evidence of full control over the entire protocol.

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