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Subject: Re: [bitcoindev] The Tragic Tale of BIP30
From: Sjors Provoost <sjors@sprovoost.nl>
In-Reply-To: <CAPv7TjbEK8r8AQgzLvrwPmQHavU-ujgJqSz+7CFy_8W0_pwMvQ@mail.gmail.com>
Date: Tue, 29 Apr 2025 17:28:13 +0200
Cc: bitcoindev@googlegroups.com,
Eric Voskuil <eric@voskuil.org>,
luke@dashjr.org
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<CAPv7TjbEK8r8AQgzLvrwPmQHavU-ujgJqSz+7CFy_8W0_pwMvQ@mail.gmail.com>
To: Ruben Somsen <rsomsen@gmail.com>
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Ruben Somsen wrote:
> >In the case of BIP30, one option could be to have a rule that says: if t=
he 2014 checkpoint is missing, then enforce the BIP54 Consensus Cleanup nLo=
ckTime rule from genesis. BIP34 can then simply go away.
>=20
> I'm afraid it's not that simple. If you wanted to fork off from some arbi=
trary point prior to the last checkpoint, you'd want to enforce the new con=
sensus rules from that exact point (not from genesis), but that requires sh=
ipping the full node software with a hash for every possible block that cou=
ld be forked off from. It's roughly 8MB of data so it's not impossible, and=
I even had this written up as an alternative solution, but I removed it in=
favor of the solution I ended up describing.
The trick is that no blocks obey the BIP54 rule for nLockTime, so they'll a=
ll be rejected and you can fork off starting at block 1.
- Sjors
--=20
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