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But then the recipient doesn’t know if the original owner has made a copy of the key.

There can be options, the OpenDime[0] is one that’s intriguing. The owner seeds the entropy before it can be used and the only way to get the private key is to physically (and visibly) alter it.

[0] https://opendime.com/

I wonder how difficult it would be to extract the key from the device. Probably not very.

I also like how they say "no trust", but in reality, you have to trust them (and their entire supply chain).

Edit: from their FAQ: "Can I re-seal after breaking the seal? No. A permanent change is made inside the flash memory of the processor." Oof. Big oof.

It would be interesting and probably a big deal to test this out, I don’t think I have the chops for it but hope to read about it if you (or anyone else) gives it a shot!

I don't either (although I certainly wish I did). I hope someone does too, though.

Yes, but to put the money on the OpenDime device requires an on-network transaction.

That won't matter anymore after they transfer it to a wallet they control, like they did today. Will it?

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