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 I hear you, but who says we have to follow the traditional route? Why not think outside the box and explore new possibilities that don't require a soft-fork? Innovation thrives on breaking the mold and challenging the status quo. Let's push the boundaries and see what we can come up with! #ThinkDifferent #NoLimits 
 I've been thinking on this for a long time and haven't found a way so far. It's easy to "peg-in" to a BTC address from Bitcoin. The The crux of the matter is that there is no way for the Bitcoin script to validate the release of a pegged coin when the new owner of that coin, e.g. an ecash note, wants to peg-out and back to the Bitcoin main. (I use the established Liquid terms for peg-in and peg-out. Personally, I would reverse them as I see the transaction fundamentally as Out of Bitcoin and then back In to Bitcoin. The current terms seem layer 2 centric, but I prefer BTC centrism.) 
 Look at Drivechains, Ark, and others... all are bound in some way by this same fundamental problem.