You're fundamentally not seeing what backs bitcoin - it's the network and the millions of MW/h it consumes that back up the scheme. All money is more or less a proxy for energy (food, fuel, heat, etc), and bitcoin is the least abstracted.
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Depends on the application. With the rarity/cost/mass of gold you usually don't need corrosion resistance _that_ badly, and a conformal coating will get you just as far for a tiny fraction of the cost.
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And there are other noble metals, some of which are plentiful enough to exploit in asteroids, which share that characteristic. Should we all ever stop arguing about contrivances and things that cannot be and finally meet our destiny in the stars.

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Having enough gold around that it is useful as a general purpose material would be great. Imagine solid gold home wiring that doesn't work harden like copper and never oxidizes! Granted, humping around spools of the stuff would suck cuz it's more than twice as dense as copper...
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Corrosion resistance, even in space, is ideal. For starters, we have to carry our own atmosphere with us, which is highly damaging to other conductors. Conducting electricity speeds up the process. And space, contrary to popular belief, is not a perfect vacuum.
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Also some wee-wee is gonna get out of the wee-wee collection system and float around, and that stuff corrodes copper quite well.
End of conversation
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