Comment: Correct me if I'm wrong

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Correct me if I'm wrong

but I don't think it's possible for two forks to merge:
("Because a block can only reference one previous block, it is impossible for two forked chains to merge.")

When connectivity is restored, certainly any mining done on the losing blockchains is lost, along with any transactions done with those now-invalidated bitcoins. And anyone who had connectivity to both networks somehow could double spend. But are transactions from the shorter blockchain, that aren't based on bitcoins mined in the shorter blockchain after the split (since those are invalid) and that are not invalidated by double-spending, merged when connectivity is restored? Or are they orphaned, and permanently invalid?

Note that this problem isn't just about global meltdowns. A war that result in highly restricted international internet connectivity, a restriction that is pretty much guaranteed to happen for obvious reasons, would make validating transactions impossible even if the internet is available within your country.

I don't know how you would solve that problem with a new algorithm, but considering how easy it is to launch a new digital currency, if there's a good solution I"m sure someone will come up with it.

If you want physical money though, why would you want some physical representation of an abstract currency like bitcoin, instead of just converting bitcoin to gold and/or silver? You're taking much greater risks with bitcoin, which might not recover at all, and you're losing the recognizability value of gold and silver. If there's any hint of an impending global meltdown that could possibly interrupt international internet connectivity then bitcoin (along with any other digital currencies and all electronic accounts for that matter) should drop to zero as everyone tries to get out of it and into something that will survive a meltdown, and at the same time gold will obviously be going up, so you lose on both sides of that exchange.