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From: Christopher Allen <ChristopherA@lifewithalacrity.com>
To: Ava Chow <lists@achow101.com>,
	 Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>
Cc: bitcoindev@groups.io
Subject: Re: [bitcoin-dev] MuSig2 derivation, descriptor, and PSBT field BIPs
Date: Tue, 16 Jan 2024 00:18:26 -0800	[thread overview]
Message-ID: <CACrqygDY0p-trbHGyhg0_uyViyryyJqO-CkOS6+tknTUG05Wew@mail.gmail.com> (raw)
In-Reply-To: <5d299fc4-8809-4f32-a9b8-17e353d6ff30@achow101.com>

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On Mon, Jan 15, 2024 at 4:28 PM Ava Chow via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> I've also made a change to the PSBT fields BIP where the aggregate
> pubkey is included as a plain pubkey rather than as xonly. I think this
> change is necessary for to make discovering derived keys easier. The
> derivation paths for derived keys contain the fingerprint of the parent
> (i.e. the aggregate pubkey) and the fingerprint requires the evenness
> bit to be serialized. So the aggregate pubkey in the PSBT fields need to
> contain that evenness information in order for something looking at only
> the PSBT to be able to determine whether a key is derived from an
> aggregate pubkey also specified in the PSBT.
>

The topic of some challenges in using x-only pubkeys with FROST recently
came up in a conversation that I didn't completely understand. It sounds
like it may be related to this issue with MuSig2.

What are the gotcha's in x-only keys with these multisig protocols? Can you
explain a little more? Any other particular things do we need to be careful
about with x-only pubkeys? I had mistakenly assumed the technique was just
a useful trick, not that it might cause some problems in higher level
protocols.

Thanks!

-- Christopher Allen

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  reply	other threads:[~2024-01-16  8:19 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-15 23:29 [bitcoin-dev] MuSig2 derivation, descriptor, and PSBT field BIPs Ava Chow
2024-01-16  8:18 ` Christopher Allen [this message]
2024-01-23 12:12   ` Michael Folkson

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