Threshold Network: Attackers attempted to mint tBTC without collateral but failed; preventative measures have been taken.

CoinFeed reported on May 20th that Threshold Network posted on the X platform that at 18:04 Beijing time on May 18th, an attacker attempted to mint tBTC without depositing the underlying BTC, but failed. No invalid tBTC was generated, and user funds were not at risk. Out of caution, given the increased frequency of malicious activity across the crypto ecosystem, Optimistic Minting has been temporarily suspended. Minting is now conducted via a sweeping mechanism, extending the minting time from approximately 1.5 hours to approximately 6-7 hours. It is understood that tBTC's basic security model involves a decentralized network of signers holding the underlying Bitcoin, and each native minting is verified through verifiable Bitcoin SPV proofs.