One more thought… wonder how secure burning your seed phrase onto leather is? People stamp it into steel, I assume leather would be rather durable too and would not be flagged through a metal detector at an airport.
You could sell the patch and people could burn the phrase in themselves.
What about 3D printing
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Would you want to insert you seed phrase into a computer before printing it? I don’t 😅
Me neither, but that doesn't limit me to 3d print the seed phrase.