Person
Chief technology officer of Ledger, a maker of hardware cryptocurrency wallets, focused on device security and key-protection technology.
Fireblocks' Michael Gutkin ties Bitcoin's quantum risk to exposed public keys, citing estimates that 6.7 million to 7 million BTC already sit behind them. Custodians can apply his remedy, fresh addresses plus a running count of exposed coins, without waiting for BIP 360.
Reality
Blockstream has not said whether its 11-of-15 federation was bypassed or complied. Until someone publishes what share of Liquid's reserves left on September 6, an L-BTC balance is an unverified claim.
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The attackers who drained 4,000 BTC from Liquid handed back 3,400 after the patch and kept 598.5. Blockstream puts about $47 million on that hold and says it will trace the coins instead of paying.
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Blockstream paused the Liquid bridge after roughly 4,000 BTC left the federation wallet, and the people holding it will send most of it back only once the flaw is fixed, which puts the patch timetable in their hands.
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The withdrawal cleared every control the Liquid Federation actually operates, which is why an 11-of-15 quorum released the bitcoin in 23 minutes. Recovery now depends on whoever holds the coins answering an email address.
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Head of cryptography Yehuda Lindell says hash-based post-quantum signatures may not split across parties. So Coinbase is researching threshold decryption plus a programmable HSM for the $250 billion it custodies.
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Blockchain security firm SlowMist says an active exploit chain walks from a Safari page to kernel access and the iOS Keychain on everything from iOS 13 to 26.5, while Apple's patches, by the same account, reach 26.3.
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Blockstream's federation signers behaved correctly and still released roughly 4,000 bitcoin, because the software that decides what counts as a real L-BTC is a different system from the keys guarding the peg.
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Ledger's CTO says the Ethereum clear-signing fix shipped two weeks before disclosure. The public release record cannot confirm that, and an autonomous scanner chose the publication date.
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A 2021 seed flaw cut entropy from 128 bits to about 40, so no attacker needed to touch the hardware. Every seed generated before July 2026 now has to be replaced.
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