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Each Ark having its own shitcoin necessitates a swap for each Ark, yes? Sure anyone could in theory run that swap service, but its still trust centralized against the given ASP for the shitcoin being swapped to/from.
You don't have to trust anyone you are literally holding a signed Bitcoin transaction.
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Ideally you receive a signed Bitcoin transaction, but there's trust along the way to that state.
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