Never store all Bitcoin in a single hardware wallet. Use 2-3 hardware wallets from different manufacturers (Coldcard, Ledger, Trezor). If one is compromised, your other holdings remain secure.
Multi-sig requires approval from multiple devices to move Bitcoin. Spend $500 on three hardware wallets; set them up as 2-of-3 multi-sig. A single compromised wallet can't authorize theft.
Subscribe to security advisories from your wallet manufacturer. When firmware updates are released, install them within 48 hours. The Coldcard exploit remained active longer because users delayed patching.
Only download firmware from official manufacturer websites. Use PGP signatures or hash verification to confirm authenticity. Typosquatting and firmware substitution are real attack vectors for large holders.
Under $10K: Single hardware wallet + regular updates. $10K-$100K: Multi-wallet + firmware checks. Over $100K: 2-of-3 multi-sig + offline backup seeds in secure locations.
Hardware wallets are still Bitcoin's safest storage. The Coldcard hack didn't break them—it proved that security requires active participation, regular updates, and redundancy.
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