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From: Peter Vessenes <peter@coinlab.com>
Date: Fri, 6 Jul 2012 10:02:47 -0700
Message-ID: <CAMGNxUvN5fCuXsSp7a8UCgQoqMHKZPFsHkemJr7_5GSWZ0X-fA@mail.gmail.com>
To: Jeff Garzik <jgarzik@exmulti.com>
Content-Type: multipart/alternative; boundary=e0cb4efe3502fa582b04c42c3c19
Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] BIP 34: Block v2, Height in Coinbase
Precedence: list

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On Fri, Jul 6, 2012 at 9:49 AM, Jeff Garzik <jgarzik@exmulti.com> wrote:

> On Fri, Jul 6, 2012 at 12:45 PM, Peter Vessenes <peter@coinlab.com> wrote:
> > The proposal is simple, and it's a small change for miners, I imagine.
> >
> > My question is: why?
> >
> > I worry about stuffing too many requirements on the coinbase. I suppose
> > the coinbase is easily extendible if we run out of bytes, but I think I'd
> > like to see some more discussion / good / bad type cases for making this
> > change. What do we get over just the prev_hash by doing this?
>
> With the existing setup (sans height in coinbase), you might not have
> unique transactions, with all that entails.
>
> Yes, I've experienced that myself, actually.


> > Anyway, some background would be great; if I missed it, I'm happy to go
> > read up, but I didn't see any links on the wiki.
>
> Gavin wrote some notes on upgrades and BIP16 lessons-learned at
> https://gist.github.com/2355445
>
> This is a super coherent and excellent writeup. I may come back with more
thoughts, I want to let it percolate. Thanks!

>  --
> Jeff Garzik
> exMULTI, Inc.
> jgarzik@exmulti.com
>



-- 
------------------------------

[image: CoinLab Logo]PETER VESSENES
CEO

*peter@coinlab.com * /  206.486.6856  / SKYPE: vessenes
811 FIRST AVENUE  /  SUITE 480  /  SEATTLE, WA 98104

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<br><br><div class=3D"gmail_quote">On Fri, Jul 6, 2012 at 9:49 AM, Jeff Gar=
zik <span dir=3D"ltr">&lt;<a href=3D"mailto:jgarzik@exmulti.com" target=3D"=
_blank">jgarzik@exmulti.com</a>&gt;</span> wrote:<br><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">

<div class=3D"im">On Fri, Jul 6, 2012 at 12:45 PM, Peter Vessenes &lt;<a hr=
ef=3D"mailto:peter@coinlab.com">peter@coinlab.com</a>&gt; wrote:<br>
&gt; The proposal is simple, and it&#39;s a small change for miners, I imag=
ine.<br>
&gt;<br>
&gt; My question is: why?<br>
&gt;<br>
&gt; I worry about stuffing too many requirements on the coinbase. I suppos=
e<br>
&gt; the coinbase is easily extendible if we run out of bytes, but I think =
I&#39;d<br>
&gt; like to see some more discussion / good / bad type cases for making th=
is<br>
&gt; change. What do we get over just the prev_hash by doing this?<br>
<br>
</div>With the existing setup (sans height in coinbase), you might not have=
<br>
unique transactions, with all that entails.<br>
<div class=3D"im"><br></div></blockquote><div>Yes, I&#39;ve experienced tha=
t myself, actually.</div><div>=A0</div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div =
class=3D"im">


&gt; Anyway, some background would be great; if I missed it, I&#39;m happy =
to go<br>
&gt; read up, but I didn&#39;t see any links on the wiki.<br>
<br>
</div>Gavin wrote some notes on upgrades and BIP16 lessons-learned at<br>
<a href=3D"https://gist.github.com/2355445" target=3D"_blank">https://gist.=
github.com/2355445</a><br>
<div class=3D"HOEnZb"><div class=3D"h5"><br></div></div></blockquote><div>T=
his is a super coherent and excellent writeup. I may come back with more th=
oughts, I want to let it percolate. Thanks!=A0</div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">

<div class=3D"HOEnZb"><div class=3D"h5">
--<br>
Jeff Garzik<br>
exMULTI, Inc.<br>
<a href=3D"mailto:jgarzik@exmulti.com">jgarzik@exmulti.com</a><br>
</div></div></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>=
<hr style=3D"font-family:Times;font-size:medium;border-right-width:0px;bord=
er-bottom-width:0px;border-left-width:0px;border-top-style:solid;border-top=
-color:rgb(204,204,204);margin:10px 0px">

<p style=3D"font-size:medium;font-family:Helvetica,sans-serif;line-height:1=
em"><span style=3D"color:rgb(50,90,135);text-transform:uppercase"><img src=
=3D"http://coinlab.com/static/images/email_logo.jpg" align=3D"right" alt=3D=
"CoinLab Logo" width=3D"130">PETER=A0<span style=3D"font-weight:bold">VESSE=
NES=A0</span><br>

<span style=3D"color:rgb(96,58,23);font-size:0.8em">CEO</span></span></p><p=
 style=3D"font-size:medium;font-family:Helvetica,sans-serif;line-height:1em=
"><span style=3D"color:rgb(96,58,23);font-size:0.9em"><strong><a href=3D"ma=
ilto:peter@coinlab.com" style=3D"text-decoration:none;color:rgb(96,58,23)" =
target=3D"_blank">peter@coinlab.com</a>=A0</strong>=A0/=A0=A0206.486.6856 =
=A0/=A0<span style=3D"font-size:0.7em;text-transform:uppercase">SKYPE:</spa=
n>=A0vessenes=A0</span><br>

<span style=3D"color:rgb(96,58,23);font-size:0.7em;text-transform:uppercase=
">811 FIRST AVENUE =A0/=A0 SUITE 480 =A0/=A0 SEATTLE, WA 98104</span></p><b=
r>

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