The Echo Protocol security breach unfolded quickly: unauthorized eBTC was minted on Monad, about $816,000 was lost, and the team says the trigger was a compromised admin key tied to its Monad deployment. Within the response window, Echo Protocol said it regained control of its admin keys and burned 955 eBTC that were still held by the attacker.
That sequence matters because it points to a protocol-level security failure, not a failure of the Monad network itself. Echo Protocol said the chain continued operating normally, while the incident appeared limited to its own deployment.
The immediate fallout now stretches across two ecosystems. Monad took the direct hit, while Aptos was pulled into the containment effort as Echo Protocol paused parts of its cross-chain setup and reviewed whether any exposure had spread.
What happened on Monad
At the center of the incident was unauthorized eBTC minting on Monad. Echo Protocol traced the breach to a Monad admin key compromise on the
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