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Thanks for mentioning the octocouplers implementation, it looks very interesting and I'll look it. Other options I'm aware of to avoid USB and complex drivers/protocols:

- Scanning QR codes (for example https://air-gap.it/)

- Audio codes (for example https://github.com/romanz/amodem)

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Wow. That is very cool.

Edit: https://air-gap.it/ seems down. But https://github.com/airgap-it is up.

I wonder if one could cut up QR codes, and store pieces separately. If that were done in Gimp or whatever, there could be multiple copies of each piece.

Do you mean sharding them using something like Shamir Secret Sharing, splitting in order to be able to transfer/store a large blob, or something else?

I meant actually cutting them with a sharp knife, or scissors. So you could hide pieces in different places. For stuff like URLs, passphrases, wallet seeds, etc.

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