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Date: Mon, 27 Apr 2015 15:35:26 -0400
From: Peter Todd <pete@petertodd.org>
To: Jorge =?iso-8859-1?Q?Tim=F3n?= <jtimon@jtimon.cc>,
Pieter Wuille <pieter.wuille@gmail.com>
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Relative CHECKLOCKTIMEVERIFY (was CLTV
proposal)
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On Sun, Apr 26, 2015 at 02:20:04PM +0200, Jorge Tim=F3n wrote:
> On Sun, Apr 26, 2015 at 1:35 PM, Jorge Tim=F3n <jtimon@jtimon.cc> wrote:
> > And a new softfork rule could enforce that all new CTxIn set nHeight
> > to the correct height in which its corresponding prevout got into the
> > chain.
> > That would remove the need for the TxOutputGetter param in
> > bitcoinconsensus_verify_script, but unfortunately it is not reorg safe
> > (apart from other ugly implementation details).
>=20
> Wait, wait, this can be made reorg-safe and more backards compatible.
> The new validation rule at the tx validation level (currently in
> main::CheckInputs()) would be
<snip>
So, seems to me that RCLTV opens up a whole rats nest of design
decisions and compromises that CLTV doesn't. Yet CLTV itself is a big
step forward, it's been implemented on Viacoin for the past few months
with no issues found, and has an extremely simple and easy to audit
implementation.
I think I'm going to argue we implement it as-is in a soft-fork. Pieter
Wuille's been working on a new way to handle soft-fork upgrades in the
block nVersion field, so this would be a good opportunity to add
something simple and well tested, and also make sure the new nVersion
soft-fork mechanism works. Equally, doing both at the same time ensures
we don't burn yet another version bit.
--=20
'peter'[:-1]@petertodd.org
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