Alex Thorn: Coldcard wallet vulnerability prompts urgent BTC move

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Ongoing attack affects Coldcard BTC wallets

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Jose Antonio Gastelum

01.08.2026

Alex Thorn: Coldcard wallet vulnerability prompts urgent BTC move — Ongoing attack affects Coldcard BTC wallets

Alex Thorn warns that an attack targeting addresses generated by Coldcard hardware wallets is ongoing.

He urges anyone with BTC in single-sig self-custody addresses created on Coldcard devices to immediately move their coins to either an exchange account or a new self-custody address not generated by a Coldcard wallet.

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Thorn has previously commented on technical developments in bitcoin. He estimated that BIP-110 signaling would fall 51 percentage points short of the required activation threshold. Earlier this year, he also pledged up to $5 million in grants to advance post-quantum cryptography and signature schemes for bitcoin.

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