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NihilCredo comments on Another attempt to explain UDT - Less Wrong
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Under UDT you don't even notice the fact that you "are" in tails-universe. You only care that there are two universes, with weights that have been "unchanging" since the beginning of time, and that your decision has certain logical implications in both of them. Then you inspect the sum of utility*weight and see that it's optimal to pay up.
Wait, you said:
But in the CM example, you did learn which it is. I am confused.
The CM example contains two "logical consequences" of your current state - two places that logically depend on your current decision, and so are "glued together" decision-theoretically - but the other "consequence" is not the you in heads-universe, which is occupying a different information state. It's whatever determines Omega's decision whether to give you money in heads-universe. It may be a simulation of you in tails-universe, or any other computation that provably returns the same answer, UDT doesn't care.