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Date: Mon, 22 Jul 2024 06:43:14 -1000
From: "David A. Harding" <dave@dtrt.org>
To: Peter Todd <pete@petertodd.org>
Cc: bitcoindev@googlegroups.com
Subject: Re: [bitcoindev] RBFR makes the CPFP carve-out obsolete with cluster
mempool, without upgrading LN nodes; TRUC/V3 does not
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On 2024-07-22 01:45, Peter Todd wrote:
> TRUC meanwhile isn't even a drop-in solution, and requires everyone to
> upgrade before cluster mempool is even possible.
The proposed BIP for TRUC[1] is indeed entirely opt-in and would require
all users of CPFP-CO (e.g. LN anchors channels) to upgrade their
software and switch to a new commitment transactions format, which
currently requires closing and reopening all anchors channels. There's
work on improving upgrade mechanisms in LN, but it would still be a pain
and a major delay to cluster mempool to depend on every LN user
upgrading.
However, there has also been significant discussion and analysis[2] of
an
imbued-semantics form of TRUC that could be retroactively applied to
LN-style anchor outputs (which are the only users of CPFP-CO we know
about). In that case, nobody needs to upgrade before cluster mempool
becomes possible.
In my previous email, I assumed you were familiar with the imbued
semantics proposal; I'm sorry for the miscommunication.
-Dave
[1]
https://github.com/bitcoin/bips/blob/158acdbbbf8ef13f6b345b6281a96e88e20d2cf9/bip-truc.mediawiki#user-content-Specification
[2]
https://delvingbitcoin.org/t/analysis-of-attempting-to-imbue-ln-commitment-transaction-spends-with-v3-semantics/527
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