Best for
Dedicated Bitcoin cold storage, multi-sig setups, and paranoid sovereign security models.
Coinkite
Coldcard Mk4
Air-gapped Bitcoin-only cold wallet with dual secure elements, USB-C power, and optional NFC support.
From $157.99
USD is authoritative · crypto amount locks at invoice creation
Verified selection · 12-month warranty
25 available
Why we selected it
Dispatched in numbered tamper-evident packaging matching on-device serial check.
Privacy considerations
USB data lines can be fully disabled in software or powered via power-only USB adapters.
Shipping & warranty
Includes Coldcard Mk4 device and tamper-evident enclosure bag. MicroSD card sold separately.
Specifications
Display128x64 bright OLED display
StorageSingle MicroSD slot for PSBT signing and encrypted backups
FirmwareOpen-source MicroPython, verifiable build reproducibility
Form FactorPocket-sized calculator form factor with tactile 12-key numeric keypad
ConnectivityUSB-C connector with data isolation switches, optional NFC tap-to-sign
MicrocontrollerHigh-performance ARM Cortex-M4 @ 120MHz
Secure ElementsDual secure elements from independent vendors (Microchip + Maxim)
Security FeaturesAnti-phishing words, duress PIN, brick-me PIN, countdown login locks
Supporting documents
No additional documents are required for this product.
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