Coldcard Mk4 review
Bitcoin-only hardware wallet with dual secure elements and advanced air-gapped features.
Price
$148
Warranty
1y
Best for
Connectivity
USB-C, NFC, microSD
When Coldcard Mk4 makes sense
This section focuses on where the device works well in practice: how it handles backups, what trust assumptions it asks you to make, and what trade-offs come with owning it long term.
Asset support
BTC only
Trust model
Secure element / open-source firmware
Pros, trade-offs, and operator fit
Pros
- Bitcoin-only focus
- Dual secure elements
- Open-source firmware
- Air-gapped operation via microSD
- Advanced multisig features
Trade-offs
- Bitcoin only (no altcoins)
- Steeper learning curve
- Less user-friendly interface
- No touchscreen
- Requires technical knowledge
Technical specifications
- Connectivity
- USB-C, NFC, microSD
- Supported assets
- BTC only
- Secure element
- Yes
- Multisig support
- Yes
Next step
If this wallet is on your shortlist, use the safety audit to check whether your backup and recovery plan are ready for it.
Open the audit
About the author
Kevin Kinnett
Senior Software Engineer · Akur8
Kevin Kinnett is a senior software engineer with over a decade of experience in fintech, distributed systems, and cloud architecture. He runs BitcoinSafe as an independent, security-focused review site for Bitcoin hardware wallets and self-custody tooling, applying engineering rigor to a category that often relies on marketing copy. Not affiliated with any wallet manufacturer; reviews are independent. BitcoinSafe earns affiliate commissions on hardware purchases made through linked merchants, but commission structures never influence verdicts.