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> One bar is meant to reenter the market, the other one not so much... how would you deal with that?

I'm not super knowledgeable about blockchain, but couldn't we arrange for jewelers and such to gift it to a special individual called dev_null, whose wallet keys have been intentionally lost?

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The jeweler could be able to mark his bar as destroyed in the chain, perhaps registering the rings in a separate chain?

That way, if every entity that handles or processes gold did the same, you could have a good idea of where each piece of gold comes from.

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