ColdCard
ColdCard is a hardware wallet for advanced users prioritizing security verification, air-gapped signing, and open-source principles. Manufactured by Coinkite, widely used in multisig setups.
Properties
| Property | Detail |
|---|---|
| Form factor | Calculator-style with physical keypad |
| Source | Verifiable source; reproducible builds offered |
| Connectivity | MicroSD + USB (USB can be disabled) |
| Key storage | Dual secure elements (different vendors) |
Key Features
- Air-gapped signing — sign PSBTs via MicroSD; no USB required
- Tamper-evident bag — physical delivery security
- Brick PIN + duress PIN — anti-coercion measures
- Multisig native — designed for complex m-of-n setups
Round Rock meetups note: "ColdCard: verifiable-source, air-gapped"
Related
- Trezor — Open-source USB alternative
- Ledger — Secure-element competitor
- Sparrow Wallet — Desktop multisig companion