Osmosis Freezes 22.65 BTC After Nomic nBTC Double-Spend Exploit

Osmosis has frozen 22.65 BTC worth nearly $1.8 million after an exploit markets involving Nomic’s nBTC bridge affected the backing of Alloyed BTC on the decentralized exchange. The incident prompted Osmosis to halt several Bitcoin-related functions while the security issue is contained.

According to Coin Bureau, the attacker exploited Nomic’s bridge by creating fraudulent nBTC through a double-spend attack. The affected assets subsequently impacted Alloyed BTC, Osmosis’ Bitcoin-backed asset.

The incident involved 39.84 nBTC, representing around 36% of Alloyed BTC’s backing. Osmosis responded by suspending deposits, withdrawals, minting and redemptions associated with the affected asset.

Nomic Vulnerability Isolated From Osmosis and IBC

The distinction between the compromised infrastructure and the affected destination is significant. Available incident reporting indicates that the vulnerability was located within Nomic’s custom forwarding mechanism, which allowed the attacker to double-spend nBTC and send fraudulent vouchers toward Osmosis.

Osmosis and the Inter-Blockchain Communication (IBC) protocol were not themselves compromised. The affected assets instead entered the Osmosis ecosystem through the cross-chain infrastructure after the underlying Nomic issue was exploited.

Osmosis and its validators subsequently carried out an emergency markets upgrade that froze 22.65 BTC associated with the attacker’s address. The measure was designed to prevent the affected Bitcoin from being moved while the broader incident was investigated.

Recovery Depends on Backing and Governance

The scale of the affected nBTC relative to Alloyed BTC’s backing places the incident beyond a conventional transaction halt. Osmosis must determine how the affected assets can be reconciled with the collateral supporting Alloyed BTC before normal minting and redemption activity can fully resume.

Osmosis has indicated that a broader recovery process will follow, including governance decisions concerning the frozen assets and the restoration of the affected backing. The episode also highlights the risks that can emerge when assets depend on multiple cross-chain financial components even when the destination blockchain itself has not been directly breached.

The immediate priority remains containment and a full accounting of the affected nBTC and BTC. Osmosis is expected to provide further details through its incident analysis and recovery plan before the suspended functions can return to normal.

Writer: Victoria Hale
Technology & Blockchain Writer

Victoria Hale writes about blockchain technology, digital infrastructure, and the intersection of emerging technologies with finance. Her articles explore how new protocols and systems are shaping the evolving digital economy.

She prioritises clarity and accuracy when explaining technical developments to a general audience.