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QR codes seems more available, sure it can't store 200kb.

But for elliptic curves you only need a few bytes.

Do QR codes provide any error correction, or is the a crease, fold or spec of dirt on the paper you printed on going to render your QR-encoded key unreadable?

It is a variable setting for each code. Here's a damaged but readable QR code: https://en.wikipedia.org/wiki/QR_code#/media/File:QR_Code_Da...

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