The other way around though, if we don't cover this stuff then we are ruling out a possibility entirely because we think they're going to be different from us. You know that sometimes, truth will be stranger than fiction. On the topic about the aliens though, I think that we will either establish a contact first or we're going to them for war, that's my first thought about this, humans are a big pile of xenophobes so I don't think we will be using bitcoin for diplomacy or even diplomacy for that matter when we meet extraterrestrials.