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From: Rusty Russell <rusty@rustcorp.com.au>
To: "Wladimir J. van der Laan" <laanwj@gmail.com>,
Peter Todd <pete@petertodd.org>
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Date: Wed, 30 Sep 2015 13:35:42 +0930
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Subject: Re: [bitcoin-dev] Let's deploy BIP65 CHECKLOCKTIMEVERIFY!
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"Wladimir J. van der Laan via bitcoin-dev"
<bitcoin-dev@lists.linuxfoundation.org> writes:
> On Sun, Sep 27, 2015 at 02:50:31PM -0400, Peter Todd via bitcoin-dev wrote:
>
>> It's time to deploy BIP65 CHECKLOCKTIMEVERIFY.
>
> There appears to be common agreement on that.
>
> The only source of some controversy is how to deploy: versionbits versus
> IsSuperMajority. I think the versionbits proposal should first have code
> out there for longer before we consider it for concrete softforks. Haste-ing
> along versionbits because CLTV is wanted would be risky.
Agreed. Unfortunately, a simple "block version >= 4" check is
insufficient, due to XT which sets version bits 001....111.
Given that, I suggest using the simple test:
if (pstart->nVersion & 0x8)
++nFound;
Which means:
1) XT won't trigger it.
2) It won't trigger XT.
3) You can simply set block nVersion to 8 for now.
4) We can still use versionbits in parallel later.
Cheers,
Rusty.
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