Subject: [bitcoindev] Allowing Duplicate Keys in BIP 390 musig() Expressions

From: "'Ava Chow' via Bitcoin Development Mailing List" <[email-masked]>
Date: Tue, 03 Jun 2025 21:07:06 +0000

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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