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Topic: tampering-proof paper wallets and coins by chemical reactions (Read 442 times)

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Defcon demonstrated that Casascius coins can be read out and sealed again without much traces

What about using ink which reacts with water and dissolves?
by making your coin wet, the private key can be exposed only one time

or by using a dye reacting with air you can have the key dissapear some time after removing the cover
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