TLDR
- On Oct. 31, Threshold Network suspended tBTC token minting and bitcoin redemptions to perform undisclosed security maintenance work.
- Approximately 4,320 bitcoin currently back 4,185 tBTC tokens in circulation, with Threshold confirming no loss of funds.
- Aave suspended fresh tBTC deposits and borrowing activity on its Ethereum Core market, which holds approximately $136.6 million in tBTC collateral.
- Risk manager Gauntlet removed roughly 65,000 USDC from a Morpho lending vault that uses tBTC as backing.
- Threshold has not disclosed the specific security vulnerability or provided a timeline for resuming redemption services.
Aave has imposed restrictions on approximately $136 million worth of tokenized bitcoin, blocking new deposits and borrowing activity. The decision followed Threshold Network’s unexpected suspension of minting and redemption operations for its tBTC token.
Threshold shut down its bitcoin bridge operations on Oct. 31, citing the need for security maintenance. The development team has not revealed specific details about the security concern prompting the pause.
tBTC enables bitcoin owners to deploy their assets across Ethereum and compatible blockchain networks. The token serves as a popular collateral option in decentralized finance lending markets.
Threshold Confirms Full Collateralization of tBTC
According to a security update released on Oct. 31, Threshold reported that approximately 4,320 bitcoin remain held in its bridge wallet infrastructure. With 4,185 tBTC tokens currently circulating, this creates a surplus of roughly 135 bitcoin in reserve backing.
“tBTC remains fully backed, and no funds have been lost,” Threshold stated in its announcement. The team’s investigation confirmed that no unauthorized token creation had occurred.
Current tBTC holders retain the ability to transfer their tokens between Ethereum and various layer-2 scaling solutions. However, fresh bitcoin deposits, new token minting, and redemption requests remain suspended. Any pending transactions will be processed after normal operations resume.
Threshold has not committed to a specific restart date for bridge functionality. The project indicated the security matter is under control and that full service will return following the implementation of appropriate fixes.
Major DeFi Platforms Reduce tBTC Exposure
LlamaRisk, a risk assessment provider for Aave, advised immediate freezing of tBTC operations on Aave’s Ethereum V3 Core market. Aave’s guardian multisignature wallet executed this recommendation at 10:01 UTC on Oct. 31.
At that moment, approximately 1,760 tBTC valued at $136.6 million had been supplied to the lending market. This represents roughly 42% of the entire tBTC token supply.
Users now cannot make additional tBTC deposits or leverage existing positions to increase their borrowing capacity. However, loan repayment and eligible collateral withdrawal remain available, and liquidation mechanisms continue functioning under existing parameters.
The suspension applies exclusively to Aave’s Ethereum Core market. tBTC lending markets on Base and Arbitrum networks had already been frozen during previous asset reduction initiatives.
LlamaRisk indicated it will continue monitoring collateral exposure and market liquidity conditions. The firm plans to recommend reinstating standard operations when circumstances permit.
Risk management firm Gauntlet also took protective measures on Oct. 31. Its Ethereum Morpho USDC Core vault held approximately 704,000 USDC allocated to a lending market using tBTC as collateral.
Gauntlet added this market to its emergency exclusion list and withdrew approximately 65,000 USDC, leaving around 640,000 USDC still deployed.
The company cautioned that the suspension could negatively impact tBTC trading liquidity. With redemption services offline, holders seeking native bitcoin must locate counterparties in secondary markets.
Should tBTC begin trading below bitcoin’s spot price, lenders may face increased difficulty executing collateral liquidations. This vulnerability proves especially concerning for markets with substantial tBTC exposure.
Threshold has instructed users to avoid sending bitcoin to previous deposit addresses or resubmitting pending transactions. The project committed to providing another security update within 24 hours of its Oct. 31 announcement, or earlier if circumstances change.
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