CoinkiteBitcoin-only wallet

Coinkite Coldcard Mk4

Name: Coinkite Coldcard Mk4
Brand: Coinkite

Coinkite Coldcard Mk4 is a Bitcoin-only wallet released in 2022. Key specs: secure element chip, air-gapped signing, signing connectivity USB-C, NFC, microSD, screen size 0.8″.

6.3Score

Security8.2

Open source4.9

Bitcoin features8.8

Ease of use3.0

Connectivity6.2

price range€140–175Reference price converted from USD

Full specifications

Year: 2022
Type: Bitcoin-only wallet
Brand: Coinkite
Popularity: #5 of 141
Series: Coinkite Coldcard · 5 generations

YesSecure Element chip

NoOpen-source firmware

YesAir-gapped signing

USB-C, NFC, microSDSigning connectivity

0.8″Screen size

NoBuilt-in battery

30 gWeight

Spec guide

How it ranks among Bitcoin-only wallets

Spec guide

Screen size · 0.8″Bottom 1%Weight · 30 gTop 43%

Compared with every model of this kind in the catalog.

compared with other Bitcoin-only wallets

Why is Coldcard Mk4 a good choice?

Compatible third-party wallets: 14better than 79% of Bitcoin-only wallets

Thickness: 7.5 mmbetter than 84% of Bitcoin-only wallets

In rankings

#28Best hardware wallets right now #7Best Bitcoin-only hardware wallets #9Most secure hardware wallets #6Best wallets for Bitcoin power users #21Lightest hardware wallets #2Compatible with the most wallet apps #27Best connectivity

Specifications

Full specifications

Security

Secure Element chip: Yes
Dual Secure Elements: Yes
Air-gapped signing: Yes
100% air-gapped: Yes
Supply-chain & tamper protection: Yes
Secure boot: Yes
Anti-klepto (anti-exfil) signing: No

Firmware & open source

Open-source firmware: No
Source code available: Yes
Reproducible builds: Yes
Firmware licence: MIT + anti-sell clause
Upgradable firmware: Yes
Firmware update via: USB, microSD
Bitcoin-only firmware / edition: Yes

Device lock

PIN lock: Yes
PIN entered on the device: Yes
Fingerprint unlock: No
Duress PIN / decoy wallet: Yes
Brick / wipe PIN: Yes
Wipe after failed attempts: Yes
Time-delayed unlock: Yes
Anti-phishing words: Yes

Keys & backup

BIP39 passphrase: Yes
Shamir backup (SLIP-39): No
Seed XOR: Yes
BIP85 child seeds: Yes
24-word seed: Yes
SeedQR backup: Yes
microSD backup: Yes
NFC backup card: No
User-added entropy (dice): Yes
Stateless use (no stored keys): Yes
Multiple seeds on one device: Yes

Bitcoin features

Multisig: Yes
Taproot: Yes
Miniscript: Yes
Message signing: Yes
Coin control: Yes
Own node connection: Yes
Tor support: Yes
Replace-by-fee: Yes
Silent Payments: No
Spending limits: Yes
Testnet: Yes

Supported assets

Altcoins & tokens: No
Bitcoin only: Yes

Connectivity

Signing connectivity: USB-C, NFC, microSD
USB: Yes
USB-C: Yes
Bluetooth: No
NFC: Yes
QR code camera: No
Animated QR (UR): No
microSD signing: Yes

Screen & input

Screen: Yes
Screen size: 0.8″
Screen type: OLED
Screen resolution: 128 × 64
Touchscreen: No
Colour screen: No
Gorilla Glass: No
Controls: Buttons
QWERTY keyboard: No

Battery & power

Built-in battery: No
Wireless charging: No

Design

Weight: 30 g
Length: 86 mm
Width: 50 mm
Thickness: 7.5 mm
Materials: Plastic
Water / dust resistance: No
Several colours available: Yes
Warranty (months): 0
Assembled in: Canada
DIY build possible: No

Apps

Desktop app: No
Mobile app: No
Works with wallet apps: Bitcoin Safe, Theya, Wasabi, Nunchuk, Cove, Electrum, Sparrow, Specter Desktop, Blockstream Green, BlueWallet, Bitcoin Keeper, Liana, Casa, Unchained
Compatible third-party wallets: 14

Other features