Interesting exercise.

If the node is accepting blocks this means that transactions are technically valid for that network. The "real" assumption in related to the transactions value, so the consensus/adoption.

Could be the real Bitcoin outside the bunker, but it is certainly if inside it someone accept a paper wallet as payment for something :)

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Interesting point thinking about the value of it being isolated. Probably, being alone in the world makes money useless. My idea in the question was more to thinkabout how would you be sure that what you are receiving (blocks) is real

Ah ok! I think #[4] spotted the matter