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Date: Tue, 03 Jun 2025 21:07:06 +0000
To: bitcoindev@googlegroups.com
From: "'Ava Chow' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Subject: [bitcoindev] Allowing Duplicate Keys in BIP 390 musig() Expressions
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Hi All,
In implementing musig() descriptor expressions, I realized that the
restriction "Repeated participant public keys are not allowed" is a bit
complicated to implement. While I don't see why anyone would want to
duplicate keys, MuSig2 does allow duplicate participant keys and
allowing them would make the implementation of musig() expressions much
easier. Thus I'd like to propose changing the BIP to remove this
restriction.
Has anyone implemented musig() expressions yet with this restriction,
and would removing it be a significant breaking change to anyone? If
not, I'll make the change to the BIP in a few days.
Thanks,
Ava
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