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QR codes are considered air gapped.

I first learned of this method after reading this, but the Cold Card is much better. The Keystone has a larger attack surface than the Q.

Let me know if you have any more questions. This is one of my favorite rabbit holes.

Do you know the reason for the larger attack surface of Keystone?

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It's basically a cell phone without the cell phone. The touch screen is one attack surface. The Q also has dual secure encleves.

I also prefer the way the Cold Card allows you to chose BIP39 seed phrases for the passphrases. This makes typos less likely.

They Keyboard on the keystone is terrible for someone with thumbs as fat as mine.

I also prefer the Seed XOR standards to Shamir Secret Sharing. SSS is not as standardized, but this is super geeky advanced stuff.

Thank you, i've heard about Keystone, but never laid my hands on one.

No problem. 😃