if by universe you mean “reality itself” then that breaks the meaning of the term. all the other examples you give are small worlds in a small world, and perfectly valid and coherent. i think the profundity of insights provided by bitcoin about reality are incalculable, but they won’t get me to flip the script on how we relate to reality itself. to me, what you do with time inverts that relation. your website referred to the continuity of time as an “assumed self referential axiom” it’s not assumed, it’s demonstrated and earned though a transcendental argument: it’s a necessary relation, a necessary precondition for anything to be at all. our rational faculty cannot draw a boundary around the big world, that is correct, what the big world means to us empirically is nonsensical, means nothing, beyond our mode of being. but, our rational faculty does recognize the way we relate to the beyond. what’s beyond the horizon of human rationality? not an answerable question, it’s a category error but how do we relate to the horizon? much and more can be known