The Coldcard Mk4 was the gold standard for years. Then Blockstream released the Jade Plus and changed the conversation. Before diving in, one important distinction: Coldcard's firmware is "verifiable source code", meaning you can audit it and verify your device runs the published code, but the license prohibits commercial reuse. The Jade Plus is fully open source under a permissive license. Both let you verify security, but Jade Plus even lets the community fork and improve it. I like that transparency. Functionally, both are air-gapped and Bitcoin-only. The Mk4 uses MicroSD for transactions. The Jade Plus uses QR codes with its built-in camera.
Buying Advice
Get the Jade Plus. Unless you specifically need some of the features the Mk4 offers, the Jade Plus is the better device.
The Bottom Line
The Jade Plus wins. QR codes are faster than swapping MicroSD cards. The built-in camera makes air-gapped signing smoother. The larger screen is easier to verify transactions on. And the fully open-source license means the security community can actually build with it, not just audit it. The Mk4's duress features are cool, but they're edge-case paranoia that most users will never need. The Jade Plus's blind oracle architecture already protects against device theft without needing to brick anything.
Under the Hood: Security
Security is the whole point. Everything else is secondary. Here's how these two handle it:
- Coldcard Mk4: Dual secure elements with extensive anti-tampering. Designed for maximum paranoia with duress features.
- Blockstream Jade Plus: Virtual Secure Element with blind oracle PIN verification. Your seed is never stored in extractable form. Uses a unique architecture where the PIN, device data, and Blockstream oracle combine to reconstruct the key only during signing.
Blockstream Jade Plus is open-source. Coldcard Mk4 uses proprietary firmware. I've said it before: "verifiable source" is not the same as open-source. One lets you audit. The other lets you look but not build. I trust the approach where the community has full access.
How They Compare
The specs that matter for Bitcoin security.
| Feature | Coldcard Mk4 | Blockstream Jade Plus |
|---|---|---|
| Price | $178 | $149 |
| Bitcoin-Only | Yes | Yes |
| Open-Source | No | Yes |
| Air-Gapped | Yes | Yes |
| Secure Element | Dual ATECC608A secure elements (belt and suspenders approach) | Virtual Secure Element (no hardware SE, but cryptographically equivalent security without the black-box trust issues) |
| Connection | MicroSD (air-gapped), USB-C, NFC | QR codes (fully air-gapped), Bluetooth, USB-C |
The Verdict
The Jade Plus is my top recommendation for most Bitcoiners. It hits the sweet spot between uncompromising security and actual usability. The air-gapped QR workflow is smooth, the screen is readable, and the open-source architecture means you're not trusting anyone's pinky promise. At $149, it undercuts the Passport and matches the Coldcard Q on features while being more approachable. Buy it.
What Blockstream Jade Plus Does Better
Best for: Security-focused Bitcoiners who want verifiable, auditable security, Users who value air-gapped operation without compromise, Those concerned about closed-source secure elements, Bitcoin maximalists who don't need altcoin support.
What Holds Coldcard Mk4 Back
Price & Value
At $149, Blockstream Jade Plus costs $29 less than Coldcard Mk4 and delivers a better experience. That's a good deal.
Market Context
The hardware wallet market has matured. Coldcard Mk4 and Blockstream Jade Plus represent two approaches to the same problem: keeping your bitcoin safe from everyone except you. The wallets that survive long-term will be the ones that take security seriously and respect the self-custody ethos.
Common Questions
Can I use my existing seed phrase?
Both wallets support standard BIP39 seed phrases. You can import your existing 12 or 24-word recovery phrase from any compatible wallet.
Do Coldcard Mk4 and Blockstream Jade Plus support multisig?
Most modern hardware wallets support multisig setups. Check the individual reviews for specifics on each wallet's multisig implementation and supported coordinators.
Which wallet is more secure, Coldcard Mk4 or Blockstream Jade Plus?
Blockstream Jade Plus has the edge on security. It earns a higher rating based on firmware approach, security architecture, and track record.
Which should I buy, Coldcard Mk4 or Blockstream Jade Plus?
Blockstream Jade Plus. It's Bitcoin-only, which means cleaner code and a smaller attack surface.
Full Reviews
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