WuBlockchain
Nomic suffered an exploit that let an attacker double-spend nBTC and push fake vouchers into Osmosis across IBC. Osmosis has paused IBC inflows and outflows and pushed an emergency upgrade that froze 22.65 BTC in the attacker's address.
Why it matters
Osmosis and IBC themselves were not compromised. The fault sits on the Nomic side of the bridge: the attacker abused Nomic's logic to mint unbacked nBTC, then routed the counterfeit vouchers across IBC into Osmosis's liquidity pools. The exploit touches 39.84 nBTC, roughly 36% of Alloyed BTC's backing, a non-trivial share of the bridged-BTC product on the chain.
Market impact
Osmosis plans to seek governance approval to seize the 22.65 BTC already frozen in the attacker's address and refill the gap from the community pool, so full backing can be restored without waiting on a slow recovery. Until that vote lands, IBC nBTC flows stay halted and any LP sitting on bridged BTC exposure is effectively frozen. The incident is the second bridge-side exploit to hit a Cosmos IBC asset this quarter, and it lands at a moment when bridged-BTC TVL has been climbing back into the billions.
Frequently asked questions
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What happened in the Nomic nBTC double-spend exploit?
An attacker exploited Nomic-side bridge logic to mint unbacked nBTC, then routed counterfeit vouchers across IBC into Osmosis liquidity pools. Osmosis and IBC consensus were not compromised.
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How much BTC is exposed to the exploit?
39.84 nBTC is affected, roughly 36% of Alloyed BTC's backing. An emergency upgrade froze 22.65 BTC in the attacker's address.
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Did Osmosis or IBC itself get compromised?
No. Osmosis and IBC were not compromised. The fault sits on the Nomic side of the bridge, with the attacker abusing Nomic's minting logic to create unbacked vouchers.
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What is Osmosis doing to recover the funds?
Osmosis paused IBC inflows and outflows, then pushed an emergency upgrade to freeze 22.65 BTC in the attacker's address. It plans to seek governance approval to seize the frozen BTC and refill the gap from the community pool.
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When will nBTC flows resume on Osmosis?
Osmosis has paused IBC nBTC flows and will not resume them until a governance vote to seize the attacker's frozen BTC passes and full backing is restored.
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