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That's a interesting idea but damned if I'm going to stick a random USB device into my computer.
Maybe that's how you demonstrate your "creds"? "You want me to do what with that USB? In my port? Go away."
Maybe an NFC implementation would be more acceptable.
I don't know, I kind of like the notion of offering someone an USB killer and if they put in into their machine, you never trust them again (cryptographically or otherwise). Jokes aside though, yes, I think NFC would be less likely to be dangerous to your computer, but maybe easier to eavesdrop on?
Also, I'm not sure how they create the private key, but shouldn't it be possible to use the same file twice, giving both of them the same private key? Break the first one, load up bitcoins on the second one, use it as a payment, then use the now known private key to extract the funds before your victim can, and essentially pass a bad check...
Not possible it mixes in user generate entropy https://opendime.com/#faq