After $38M Coldcard Hack, Ledger CTO Warns on Bitcoin Wallet Security

A wallet believed to be nearly impossible to break got broken anyway, and roughly $38 million in Bitcoin vanished in under half an hour. That real-world jolt is now shaping how the industry talks about Bitcoin wallet security, with Ledger CTO Charles Guillemet urging users not to treat multisig wallets as an automatic upgrade just because a rival device failed.

Key takeaways

• Ledger CTO Charles Guillemet warns Bitcoin holders against rushing into multisig setups after a Coldcard hardware wallet flaw let an attacker drain roughly 594 BTC, worth about $38 million, from around 500 wallets in a 25-minute sweep, according to CoinDesk.
• Guillemet argues that adding complexity to a wallet setup can introduce new risks rather than eliminate old ones.
• He points to Bitcoin Miniscript as a way to build advanced spending rules, including inheritance plans and time-locked recovery keys, without the full complexity of traditional multisig.
• Ledger’s “clear signing” feature and its support for the cryptographic MuSig2 standard are presented as practical alternatives already built into its hardware wallets.
• For most people, Guillemet says, a properly backed-up single-signature hardware wallet is still the most sensible option.

Ledger CTO Warns Against Rushing Into Multisig Wallets

Guillemet’s message is straightforward: don’t let a headline dictate your entire security setup. He has urged Bitcoin users not to rush into adopting multisig wallets simply because a competing device suffered a breach, arguing that the reflex to “add more signatures” can backfire.

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