Coldcard Mk4 and Foundation Passport both made the right call: Bitcoin only, no altcoin nonsense. The question isn't whether these are good wallets. They are. The question is which one is better for you.
I've tested both of these wallets and formed opinions the old-fashioned way: by actually using them. Here's what stood out.
The Bottom Line
Both are solid Bitcoin-only choices, but Foundation Passport edges out the competition with superior features and community trust.
Side-by-Side Comparison
The specs that matter for Bitcoin security.
| Feature | Coldcard Mk4 | Foundation Passport |
|---|---|---|
| Price | $178 | $199 |
| Bitcoin-Only | Yes | Yes |
| Open-Source | No | Yes |
| Air-Gapped | Yes | Yes |
| Secure Element | Dual ATECC608A secure elements (belt and suspenders approach) | ATECC608A |
| Connection | MicroSD (air-gapped), USB-C, NFC | QR codes (air-gapped), MicroSD |
Under the Hood: Security
The security model is where you should start any comparison. Everything else is just features.
- Coldcard Mk4: Dual secure elements with extensive anti-tampering. Designed for maximum paranoia with duress features.
- Foundation Passport: Open-source with secure element. Premium build quality.
Foundation Passport is fully open-source, inside and out. Coldcard Mk4 technically isn't. This matters more than just about anything else to me. With only "verifiable-source" firmware, no matter what a company says, there's ultimately a small layer of trust still present. Why not let the community gain full access? Open-source means anyone can not just look at the code, but build with it too. Blockstream hosts all kinds of DIY workshops at conferences to showcase the Jade's brutally transparent architecture. I know which approach I trust with my bitcoin.
Why Foundation Passport Wins
Best for: Users who want premium build quality, Those who value air-gapped + open-source combination, Bitcoin-only maximalists with budget for premium device, Users who prefer physical controls over touchscreens.
Where Coldcard Mk4 Falls Short
"Verifiable source" but not truly open source — license restricts community. CEO has worked against other Bitcoin-only manufacturers. MicroSD-only workflow slower than QR codes.
My Take
The Passport is the premium choice and it knows it. The build quality justifies part of the $199 price tag. The open-source firmware and air-gapped capability put it in the same tier as Jade Plus and Coldcard. But it's larger and heavier. If you want something that feels substantial and looks good on a desk, get the Passport. If portability matters, the Jade Plus does air-gapped better in a smaller package.
What You Pay
Coldcard Mk4 costs less at $178, but the $21 you'd save isn't worth the trade-offs. Foundation Passport earns its price tag.
Common Questions
Is Coldcard Mk4 or Foundation Passport better for beginners?
Both are straightforward to set up. Foundation Passport is my overall recommendation. If you're new to hardware wallets, either one will work, but a Bitcoin-only wallet keeps things simpler.
Which should I buy, Coldcard Mk4 or Foundation Passport?
Foundation Passport. It's Bitcoin-only, which means cleaner code and a smaller attack surface.
Are Coldcard Mk4 and Foundation Passport Bitcoin-only?
Yes, both are Bitcoin-only wallets with no altcoin support.
Can I store other cryptocurrencies on these wallets?
No. Both are Bitcoin-only, which I consider a feature. Less code means fewer vulnerabilities.
Full Reviews
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