A software bug in the Nomic bridge has frozen roughly 36% of the allBTC supply on Osmosis, according to a report from shattered.io. The defect leaves more than a third of the wrapped Bitcoin asset deployed on the Cosmos-based decentralized exchange inaccessible to holders until engineers ship and execute a fix.

The incident centers on Nomic's bridging infrastructure, the system that mints and redeems nBTC — Bitcoin-pegged collateral that Osmosis aggregates into allBTC alongside other wrapped Bitcoin representations. A bug in that pipeline has severed the normal redemption path for a substantial share of the pooled asset. Holders of the affected allBTC cannot currently move their positions back to native Bitcoin through the intended mechanism.

The 36% figure is significant for a single failure event. Wrapped Bitcoin on Cosmos operates on thin liquidity relative to Ethereum's bridge ecosystem, so the immobilization of more than a third of one pool concentrates risk in a way larger markets rarely see. The remaining unfrozen portion of allBTC continues to trade on Osmosis, but the frozen tranche effectively reduces the redeemable float and could distort swap pricing for the asset if traders price in redemption uncertainty.

The failure mode matters as much as the size. Bridge defects of this type typically fall into two categories: a hold in the minting or redemption logic that locks assets in place, or a misaccounting bug that misstates balances. The shattered.io report characterizes this as a freeze rather than a theft, meaning the underlying Bitcoin remains accounted for but is operationally stranded. No exploit or loss of user funds has been reported in connection with the bug.

For Nomic, the operational consequence is a credibility test of its bridge architecture. Nomic positioned its Bitcoin bridge as a trust-minimized alternative to custodial wrapped Bitcoin issuers, using its own chain and IBC connectivity to move Bitcoin into Cosmos DeFi. Any defect in that pipeline undercuts the core value proposition: if redemption reliability is in question, integrators and treasuries that routed through Nomic may reassess allocations. Osmosis, which built allBTC as a aggregated Bitcoin representation to consolidate fragmented wrapped BTC liquidity, now faces a composability problem — the index-style asset contains a frozen component, and any downstream protocol using allBTC as collateral inherits that impairment.

The immediate task for the Nomic team is a patch, a coordinated upgrade, and a restoration of redemptions for the affected tranche. Frozen-asset incidents of this kind have historically resolved through governance-approved fixes or emergency migrations, processes that depend on the bridge's specific upgrade mechanics and validator coordination. Until redemption flow resumes, the effective circulating supply of allBTC on Osmosis is materially lower than its reported figure, and market participants should treat quoted depth on the asset with caution.

The report does not specify a timeline for remediation. Watch for a fix announcement from the Nomic team, a governance or upgrade proposal on the Nomic chain, and a subsequent restoration of redemption capacity as the signals that determine when the frozen 36% of allBTC re-enters circulation.