Bitcoin

Hardware wallet

By Paul Brock·Updated on 22-04-2026
TL;DR

A hardware wallet is a physical device (USB-stick-like) that generates and stores private keys offline, with an air-gapped signing process.

Hardware wallets (Ledger, Trezor, Coldcard, BitBox) keep private keys permanently offline. Transactions are signed internally on the device; only the signed tx leaves. Even on a hacked computer an attacker cannot steal your keys. For serious amounts (€1,000+) a hardware wallet is the absolute minimum standard.

Example

User opens Sparrow Wallet on laptop, composes transaction, sends to Coldcard Q (air-gapped via QR or SD card). Coldcard shows tx on own screen, asks confirmation, signs. Signed tx returns to laptop via QR. No key exposure.

Frequently asked questions

Can a hardware wallet be hacked?

In theory via physical chip attack (requires lab equipment). Mitigation: passphrase ('25th word') means even physical compromise doesn't automatically grant fund access.

Related terms

Cold storageSelf-custodySeed phraseOrdinals

Further reading

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