multi signature – Do BIP199’s HTLCs suffer from script malleability?

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The Script define in bip-0199 may suffer from OP_IF malleability if not used in a witness Script (which enforces that the argument to OP_IF is minimal, that is either the empty vector or 0x01).

There may be other malleability sources in this Script that i didn’t spot, and more generally malleability being very difficult to reason about it’s worth using tools such as Miniscript to prevent your Script’s satisfaction(s) to be (too much) malleable.



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