Bitcoin WikiWallets & custody

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Updated 9 October 2026StubRandom article

In plain words

A device that never connects to a computer by cable or network; data moves by QR code or SD card.

Glossary on the Learn page

See also

Hardware wallet
A hardware wallet is a small device that keeps your private keys offline and signs transactions inside itself. Even if your computer is infected, the keys never leave the device.
PSBT
Partially Signed Bitcoin Transaction: a standard file format to pass a transaction between wallets for signing.
Hot / cold wallet
Hot: keys on an internet-connected device. Cold: keys kept offline.