Per BIP327, MuSig2 key aggregation is defined for u public keys where 0 < u < 2^32.
Previously, the code did not handle u == 0.
This patch updates the code to reject an empty pubkey list and adds a regression test.
musig: Reject empty pubkey list in GetMuSig2KeyAggCache #35316
pull nervana21 wants to merge 1 commits into bitcoin:master from nervana21:reject-empty-pubkey-list changing 2 files +10 −0-
nervana21 commented at 3:33 PM on May 18, 2026: contributor
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musig: Reject empty pubkey list in GetMuSig2KeyAggCache 8ce84321ce
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DrahtBot commented at 3:33 PM on May 18, 2026: contributor
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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35316.
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