I think bitcoin becomes the main currency used on Mars because by the time we're settling Mars bitcoin will be the main currency used on Earth. Over time I think Martians will "revolt" and start their own version of bitcoin, to gain the advantages of a combined mining/energy industry. I think this new bitcoin won't be a shitcoin because its center of hash will be far away from Earth -- a property no altcoin on Earth could ever have.

What is the likelihood this *doesn't * come to pass, and bitcoin remains the main currency used on Mars forever ? I hope low, honestly because I love the ideas I put forth in the Bitcoin Astronomy series, and if Martians don't revolt, then maybe none of the rest of it happens. I suppose one reason they might not is if their energy economy grew acceptably without mining. Who knows if that will be true or not!