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it looks like it, but requires op_cat. I took waxwing's meaning here to be "maybe you can figure out how to build the thing you want using weird math, rather than trying to change bitcoin -- stop waiting for permission."
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I wouldn't be hung up about an experiment/demo requiring op_cat. It was showcasing a direction.
Its exactly that same direction, from where I am sitting. Maybe the next question on things like that ought to be: what can we do without op_cat. Not even a tradeoff, but rather a solution to something new.
I think I agree with all of that but not the "irrelevance". The thing that is hopefully becoming irrelevant are all these dreams of enhancing the protocol with features.
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Isn't that what Andrew Poelstra was aiming towards with cat+schorr tricks?