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Date: Tue, 7 Feb 2023 14:04:00 -0500
From: Peter Todd <pete@petertodd.org>
To: Russell O'Connor <roconnor@blockstream.com>,
Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Message-ID: <Y+KgoLiyAvGhuHCE@petertodd.org>
References: <CAAQdECCH=YOcu4g6Ku1_G4CnRg6rsaFPFPwbABx9aZin9A8+2A@mail.gmail.com>
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Subject: Re: [bitcoin-dev] Unenforceable fee obligations in multiparty
protocols with Taproot inputs
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On Tue, Feb 07, 2023 at 01:35:12PM -0500, Russell O'Connor via bitcoin-dev =
wrote:
> There is a bug in Taproot that allows the same Tapleaf to be repeated
> multiple times in the same Taproot, potentially at different Taplevels
> incurring different Tapfee rates.
>=20
> The countermeasure is that you should always know the entire Taptree when
> interacting with someone's Tapspend.
Another countermeasure could be to implement RBF on taproot witnesses, allo=
wing
transactions with deeper, less efficient, tapleaf scripts to be replaced wi=
th
shallower, more efficient, tapleafs. If implemented by giving your peer some
kind of delta encoded update, the bandwidth efficiency may be sufficient to
always allow such updates.
--=20
https://petertodd.org 'peter'[:-1]@petertodd.org
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