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As per the test vectors, musig key expressions require the aggregation step to precede the change/address_index derivations.
jonatack
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Proposed BIP modification
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jonatack
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Jun 22, 2025
| * <tt>wsh(multi(2,@0/**,@1/**))</tt> - SegWit 2-of-2 multisig, keys in order. | ||
| * <tt>sh(sortedmulti(2,@0/**,@1/**,@2/**))</tt> - Legacy 2-of-3 multisig, sorted keys. | ||
| * <tt>tr(musig(@0/**,@1/**))</tt> - MuSig2 2-of-2 in the taproot keypath | ||
| * <tt>tr(musig(@0,@1)/**)</tt> - MuSig2 2-of-2 in the taproot keypath |
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This does remove the contradiction between the example here being the same as the invalid policy example in line 313 below.
Is there further explanation somewhere about the statement in line 313 "Derivation before aggregation is not allowed in wallet policies (despite being allowed in BIP-390)"?
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Thanks! Fine for a different pull, but if there is no further explanation on this in the BIP, it may be good to add some (along with those links).
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As per the test vectors, musig key expressions require the aggregation step to precede the change/address_index derivations in wallet policies.