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When society falls apart the rich won’t have anything that the poor won’t. The people who built these bunkers for the super rich are going to put a 9mm in the back of their head and invite their brother Steve to take the owners spot. “Combination locks on the food supply?” Waterboard the guy till he gives us the combo, then kill him.

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This could be solved with resource access requiring multiparty agreement, like the Bitcoin multisignature wallets: the location that contains the food and water for a week requires permission from 2 parties that are located in 2 separate geographical locations

Apologies for the snark, but only on HN would anyone seriously suggest blockchain as a solution to having a gun pointed at your head.

Why would anyone assume the risk to put a gun to your head when they know you can't give them what they want just by yourself? With blockchain you can prove them that's the case. They would have to also put a gun to the head of the cosigner(s) in order to get it.

I am not aware of any other mechanism similar to BTCs multisig that doesn't require a trusted third party.

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