Security Incident · Bridge
Nomic nBTC Bridge Double-Spending Attack: $3.15M Reported Loss
An attacker exploited a bug in Nomic’s custom forwarding mechanism to double-spend nBTC and send unbacked vouchers to Osmosis.
- Reported loss
- $ 3,150,000
- Attack category
- Double-Spending Attack
Incident Overview
Osmosis and IBC themselves were not compromised. 39.84 nBTC of the minted supply sat in Alloyed BTC (~36% of its backing). Osmosis froze Nomic and Alloyed BTC flows, upgraded with validators, and froze 22.65 BTC in the attacker’s address. Governance will be asked to seize those funds and cover the rest from the community pool.
Sources & References
This record presents information attributed to the linked sources. Incident dates describe the original event, not a new report. Reported loss figures reflect the source record and are not current market valuations.