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bip138: clarify MuSig participant eligibility

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MuSig aggregation hides participant keys, so account xpubs do not need
individual trailing derivation.

Specify that encryption uses participant roots rather than the aggregate key.

Add MuSig2 test vectors: one for a bare aggregate and one for aggregate
derivation.
This commit is contained in:
Sjors Provoost authored and Murch committed 2026-09-24 20:11:20 -07:00
1 parent 5fc05e2b17
commit 11a3be7458
2 files changed
+35 -8
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bip-0138/test_vectors/recipient_keys.json
+20
View File
@@ -71,5 +71,25 @@
"pk(04ebd252ca0877aae09b9d058219682775aa3cbcd049c12f07832f2cf6a3b517089e956909c4c07e8529f45f3ff8904d28df5a181619e21bdf748a896322530039)"
],
"expected_keys": null
},
{
"description": "Bare MuSig participant xpubs",
"descriptors": [
"tr(musig(tpubDEPBvXvhta3pjVaKokqC3eeMQnszj9ehFaA2zD5nSdkaccwGAizu8jVB2NeSpvmP2P52MBoZvNCixqXRJnTyXx51FQzARR63tjxQSyP3Btw,tpubDC5FSnBiZDMmhiuCmWAYsLwgLYrrT9rAqvTySfuCCrgsWz8wxMXUS9Tb9iVMvcRbvFcAHGkMD5Kx8koh4GquNGNTfohfk7pgjhaPCdXpoba))"
],
"expected_keys": [
"8b42cd4776376c82791b494155151f56c2d7b471e0c7a526a7ce60dd872e3867",
"ebd252ca0877aae09b9d058219682775aa3cbcd049c12f07832f2cf6a3b51708"
]
},
{
"description": "Derivation after MuSig aggregation",
"descriptors": [
"tr(musig(tpubDEPBvXvhta3pjVaKokqC3eeMQnszj9ehFaA2zD5nSdkaccwGAizu8jVB2NeSpvmP2P52MBoZvNCixqXRJnTyXx51FQzARR63tjxQSyP3Btw,tpubDC5FSnBiZDMmhiuCmWAYsLwgLYrrT9rAqvTySfuCCrgsWz8wxMXUS9Tb9iVMvcRbvFcAHGkMD5Kx8koh4GquNGNTfohfk7pgjhaPCdXpoba)/<0;1>/*)"
],
"expected_keys": [
"8b42cd4776376c82791b494155151f56c2d7b471e0c7a526a7ce60dd872e3867",
"ebd252ca0877aae09b9d058219682775aa3cbcd049c12f07832f2cf6a3b51708"
]
}
]