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Nomic nBTC double-spend exploit stories

Sep 10, 2026

Cosmos ecosystem shaken by 40 BTC Nomic exploit that went undetected for 74 days

An attacker minted over 40 BTC worth of nBTC out of thin air on Nomic on June 25, but Osmosis took 74 days to discover the exploit, which left allBTC 36% unbacked. The incident contributed to an 8.3% decline in ATOM price amid shaken investor confidence.

Sep 10, 2026·3 sources
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Top claims

  • ▪The attacker combined two separate bugs in Nomic's custom forwarding mechanism to mint 40.650602 BTC of nBTC on Osmosis with no Bitcoin backing.
  • ▪The attacker of the Nomic chain managed to cash out approximately $1 million by sending 671 ETH to Tornado Cash via Ethereum.
  • ▪Transaction fees generated from Injective USDC activity will fund programmatic buybacks of ATOM, the native token of Cosmos Hub.

Subtopics

DeFiBlockchain interoperabilityCrypto securityBitcoin

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