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- Bitkey vs Coldcard Mk3
Block Bitkey vs Coinkite Coldcard Mk3
What Bitkey does better (1) and where Coldcard Mk3 wins (2) — every spec side by side.
vs
6.4Open source3.0
Why is Bitkey better than Coldcard Mk3?
- Open-source firmwareYes · Coldcard Mk3: No
Why is Coldcard Mk3 better than Bitkey?
- Weight65 g vs 30 g2.2×
- Thickness13 mm vs 9 mm+44%
Specifications
Side by side
| Security | ||
| Secure Element chip | No | — |
| Air-gapped signing | No | — |
| 100% air-gapped | No | — |
| Supply-chain & tamper protection | No | — |
| Secure boot | Yes | — |
| Anti-klepto (anti-exfil) signing | No | — |
| Firmware & open source | ||
| Open-source firmware | Yes | No |
| Source code available | Yes | Yes |
| Reproducible builds | No | No |
| Firmware licence | MIT | — |
| Upgradable firmware | Yes | Yes |
| Firmware update via | NFC | — |
| Bitcoin-only firmware / edition | Yes | — |
| Device lock | ||
| PIN lock | No | — |
| PIN entered on the device | No | — |
| Fingerprint unlock | Yes | — |
| Duress PIN / decoy wallet | No | — |
| Brick / wipe PIN | No | — |
| Wipe after failed attempts | No | — |
| Time-delayed unlock | No | — |
| Anti-phishing words | No | — |
| Keys & backup | ||
| BIP39 passphrase | No | — |
| Shamir backup (SLIP-39) | No | — |
| Seed XOR | No | — |
| BIP85 child seeds | No | — |
| 24-word seed | No | — |
| SeedQR backup | No | — |
| microSD backup | No | — |
| NFC backup card | No | — |
| User-added entropy (dice) | No | — |
| Stateless use (no stored keys) | No | — |
| Multiple seeds on one device | No | — |
| Bitcoin features | ||
| Multisig | Yes | — |
| Taproot | No | — |
| Miniscript | No | — |
| Message signing | No | — |
| Coin control | Yes | — |
| Own node connection | Yes | — |
| Tor support | No | — |
| Replace-by-fee | No | — |
| Silent Payments | No | — |
| Spending limits | No | — |
| Testnet | No | — |
| Supported assets | ||
| Altcoins & tokens | No | — |
| Bitcoin only | Yes | — |
| Connectivity | ||
| Signing connectivity | NFC | — |
| USB | No | — |
| USB-C | Yes | — |
| Bluetooth | No | — |
| NFC | Yes | — |
| QR code camera | No | — |
| Animated QR (UR) | No | — |
| microSD signing | No | — |
| Screen & input | ||
| Screen | No | — |
| Touchscreen | No | — |
| Colour screen | No | — |
| QWERTY keyboard | No | — |
| Battery & power | ||
| Built-in battery | Yes | — |
| Battery capacity | 330 mAh | — |
| Removable battery | No | — |
| Wireless charging | No | — |
| Design | ||
| Weight | 65 g | 30 g |
| Length | 62 mm | 88 mm |
| Width | 56 mm | 51 mm |
| Thickness | 13 mm | 9 mm |
| Materials | Corian and stainless steel | — |
| Water / dust resistance | No | — |
| Several colours available | No | — |
| Warranty (months) | 12 | — |
| Assembled in | USA | — |
| DIY build possible | No | — |
| Apps | ||
| Official apps | Android, iOS | — |
| Desktop app | No | — |
| Mobile app | Yes | — |
| Compatible third-party wallets | 0 | — |
| Other features | ||
| FIDO2 / U2F security key | No | — |
| Password manager | No | — |
