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Coldcard MK4 vs Bitkey

Coldcard MK4
Overall Rating
Bitkey
Overall Rating
Visit Coldcard's Site
Visit Bitkey's Site
Coldcard MK4 logo Visit Coldcard's Website Bitkey logo Visit Bitkey's Website

Key differences

  1. Coldcard MK4 is built for advanced users with secure elements, offline microSD signing, and keypad entry; Bitkey focuses on simplicity with fingerprint login and no screen.
  2. Bitkey is easier to set up and use for mobile-first users with its 2-of-3 multisig and NFC tap-to-confirm, while Coldcard requires more technical understanding and manual steps.
  3. Coldcard provides more granular control for air-gapped Bitcoin-only custody; Bitkey trades control for convenience, relying partly on cloud-based recovery.


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Price

Coldcard MK4

$167.94 USD

Bitkey

$150 USD

Launch

Coldcard MK4

2022

Bitkey

2023

Screen Size

Coldcard MK4

128x64 pixel OLED display

Bitkey

No display

Box Includes

Coldcard MK4

  • COLDCARD™ Mk4

Bitkey

Bitkey hardware device, USB-C to USB-A charging cable, Getting started guide

Security Features

Passphrase Support

Coldcard MK4

Bitkey

Passphrase Entry

Coldcard MK4

Device

Bitkey

-

PIN Protection

Coldcard MK4

Bitkey

Shamir Secret Sharing

Coldcard MK4

Bitkey

Tor Support

Coldcard MK4

Bitkey

Usage

Platforms

Coldcard MK4

  • Windows
  • macOS
  • Linux
  • Android
  • iOS

Bitkey

  • Android
  • iOS

Supported Coins

Coldcard MK4

Bitcoin Only

Bitkey

Bitcoin Only

Interfaces

Coldcard MK4

Numeric Keypad, NFC-V, USB-C, AirGap SneakerNET, Virtual Disk, MicroSD Card

Bitkey

NFC, USB-C

Technical Details

Secure Elements

Coldcard MK4

  • Dual Secure Elements (ATECC608 & DS28C36B)
  • AES-256-CTR encrypted storage
  • COLDCARD Co-Signing (CCC)

Bitkey

Fingerprint scanner, 2-of-3 multisig setup

Open Source

Coldcard MK4


Firmware & Software

Bitkey


Software

FIDO Authentication

Coldcard MK4

Bitkey

Size

Coldcard MK4

86x50x7.5 mm (3.39x1.97x0.3 in)

Bitkey

56 mm x 62 mm x 13 mm (2.20 x 2.44 x 0.51 in)

Weight

Coldcard MK4

30g (1.1oz)

Bitkey

65g (2.3oz)

Bitcoin-Only Version

Coldcard MK4

Bitkey

Integration & Multisig

Integrations

Coldcard MK4

  • Nunchuk
  • Sparrow
  • Bitcoin Core
  • Electrum
  • BlueWallet
  • Casa
  • Fully Noded
  • Specter Desktop
  • Unchained
  • Wasabi Wallet
  • Coldcore
  • Theya

Bitkey

  • Azteco
  • Blockchain.com
  • Cash App
  • Coinbase
  • Moonpay
  • Robinhood

Multisig Support

Coldcard MK4

Bitkey

  • Bitkey 2-of-3 Multisig Setup

Company Details

Parent Company

Coldcard MK4

Coinkite

Bitkey

Block Inc.

Parent Company Founded

Coldcard MK4

2011

Bitkey

2009

Security Incidents

Coldcard MK4

No known security incidents

Bitkey

No known security incidents

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