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In-Reply-To: <2D094CEC-3756-45B0-970F-1EB33DF352C5@xbt.hk>
References: <2D094CEC-3756-45B0-970F-1EB33DF352C5@xbt.hk>
From: "Russell O'Connor" <roconnor@blockstream.io>
Date: Sun, 2 Apr 2017 16:39:13 -0400
Message-ID: <CAMZUoKkFh-uBwzTZoJ0kzyJukEG2HeDf_VmTwgZMm1esD+TaFQ@mail.gmail.com>
To: Johnson Lau <jl2012@xbt.hk>, 
	Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Content-Type: multipart/alternative; boundary=f403045e364c5ab0df054c350a1b
Subject: Re: [bitcoin-dev] BIP draft: Extended block header hardfork
Precedence: list

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On Sun, Apr 2, 2017 at 4:13 PM, Johnson Lau via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

>         =E2=80=A2 the witness of the first input of the coinbase transact=
ion MUST
> have exactly one stack item (the "extended header"), with the following
> data:
>                 =E2=80=A2 bytes 0 to 3: nHeight MUST be equal to the heig=
ht of
> this block (signed little endian)
>

 Someone told me a while back that it would be more natural if we move the
nHeight from the coinbase script to the coinbase locktime.  Have you
considered doing this?

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<div dir=3D"ltr">On Sun, Apr 2, 2017 at 4:13 PM, Johnson Lau via bitcoin-de=
v <span dir=3D"ltr">&lt;<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation=
.org" target=3D"_blank">bitcoin-dev@lists.linuxfoundation.org</a>&gt;</span=
> wrote:<br><div class=3D"gmail_extra"><div class=3D"gmail_quote"><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =E2=80=A2 the witness of =
the first input of the coinbase transaction MUST have exactly one stack ite=
m (the &quot;extended header&quot;), with the following data:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =E2=80=A2 bytes 0 t=
o 3: nHeight MUST be equal to the height of this block (signed little endia=
n)<br></blockquote><div><br></div><div>=C2=A0Someone told me a while back t=
hat it would be more natural if we move the nHeight from the coinbase scrip=
t to the coinbase locktime.=C2=A0 Have you considered doing this?<br></div>=
</div></div></div>

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