Subject: Re: [bitcoindev] RBFR makes the CPFP carve-out obsolete with cluster mempool, without upgrading LN nodes; TRUC/V3 does not

From: "David A. Harding" <[email-masked]>
Date: Mon, 22 Jul 2024 06:43:14 -1000

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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