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You wouldn't need all of this. You could just use atomic swaps with longer HTLC parameters.
Martians are not going to do all of this extra crap just to carry your BTC bags. This attitude is delusional at this point, the universe does not revolve around bitcoin's brand recognition.
The obvious solution is to just fork BTC again from genesis to make some sort of "MarsCoin" and then do atomic swaps between Bitcoin and MarsCoin.
The universe doesn't have to revolve around BTC. All it takes is a couple bitcoiners on mars to establish a martian lightning network. MarsCoin will certainly exist (it already does). But getting people to use it (even if its martian mineable) might be harder than just using another lightning network. Issue the mars coin on taro if you want!
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I think what you would end up seeing in reality is that the second-biggest coin on the market, (say, litecoin or something similar to bitcoin that has a significant market share) would take over the market segment while bitcoiners are still trying to figure out how to sync the network over massive interplanetary latency.
This would cause litecoin (or whatever other cryptocurrency) to piss off a lot of earthlings because the latency would get higher for them as 51% of blocks are mined on mars. Eventually litecoin (or whatever) would be as unusable on earth as bitcoin is unusable on mars.
I also say litecoin because the BTC<->LTC atomic swap is one of the oldest and most well established, using the HTLC method, and like bitcoin they are ASIC mined.
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