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Subject: Re: [bitcoindev] The Tragic Tale of BIP30
From: Sjors Provoost <sjors@sprovoost.nl>
In-Reply-To: <CAPv7TjZTWhgzzdps3vb0YoU3EYJwThDFhNLkf4XmmdfhbORTaw@mail.gmail.com>
Date: Mon, 28 Apr 2025 13:48:31 +0200
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Luke Dashr wrote:
> Solution C could be to remove it, but restore the previous UTXO. In other=
words, treat the overwrite as a spend of the overwritten transaction.
This might also be cleaner at the Bitcoin Core implementation level, becaus=
e each UTXO set entry contains its creation height. And it might (conceptua=
lly) help Utreexo and SwiftSync.
Eric Voskuil wrote:
> I'm not aware of any compelling argument to hard fork out the existing ch=
eckpoints
Bitcoin Core plans to remove checkpoints entirely by v30 this fall. I just =
started a thread about this.
Ruben Somsen wrote:
> One last point to address is why BIP34 gets deactivated if block 227931 i=
s reorged out. The reason for this is because otherwise it'd open the door =
to possibly creating outputs prior to BIP34's activation that will conflict=
with BIP34's rules for ensuring coinbase transaction uniqueness (the exact=
issue the Consensus Cleanup is seeking to resolve).
>=20
> Ideally, it'd be nice to be able to sunset the BIP30 UTXO set check compl=
etely, ensuring it's no longer required, even in case of a reorg.
As I suggested in the other thread, it might be useful to have a more gener=
al BIP to describe the various issues around an alien-attack level reorg, f=
or those who want to stick around and salvage the project.
In the case of BIP30, one option could be to have a rule that says: if the =
2014 checkpoint is missing, then enforce the BIP54 Consensus Cleanup nLockT=
ime rule from genesis. BIP34 can then simply go away.
(while you're at it, this rule could disable bare script, p2pk, p2sh, segwi=
t v0, sigops counting and maybe some legacy stuff)
- Sjors
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