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Message-ID: <5466D9FF.3030105@haskoin.com>
Date: Fri, 14 Nov 2014 20:43:43 -0800
From: Jean-Pierre Rupp <root@haskoin.com>
Organization: Haskoin
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Subject: Re: [Bitcoin-development] The difficulty of writing consensus
 critical code: the SIGHASH_SINGLE bug
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Jean-Pierre Rupp from Haskoin here.

I support a hard fork to fix consensus bugs.  The Bitcoin protocol should=
 eventually get to a state where it is documented in a clear and understa=
ndable fashion.  Bugs are bugs, and are the enemy.  We should not attempt=
 to live with them.  We should be opening a process of thoroughly documen=
ting and reparing consensus bugs on a separate branch, and eventually sch=
edule a hard fork.

There are two good things that will come out of that:

1. Known bugs will be gone, and
2. We will have a process in place to get rid of future bugs in eventual =
future hard forks.

We do not need to become paranoid about the ramifications of a hard fork,=
 or how it will open the door for unwanted changes in the protocol.  We a=
re discussing about removing bugs, and bugs that could be used to exploit=
 the network in ways that may not be immediately obvious.

There are 144 blocks generated per day by groups of miners that are mostl=
y identified.  It is not going to be a titanic task to get consensus from=
 the main mining pools on fixing this at the mining level.  We must addre=
ss how the fixes for some of these bugs affect other types of software su=
ch as wallets.  I can think that fixing the bug where OP_CHECKMULTISIG po=
ps an extra value from the stash could be more traumatic, since it requir=
es anything that creates and validates multi-signature transactions to ch=
ange the way it works.  Hardware wallets could be impacted.  But most of =
the consensus bugs would not affect the way the vast majority of bitcoin =
transactions that are currently created.  Therefore it should not be trau=
matic at all for users, but only really affect mining pools, who would on=
ly need to be convinced to upgrade their bitcoind well in advance, which =
seems to me that it is not an issue at all.

We should not compare doing a Bitcoin hard-fork with doing something like=
 deploying IPv6 world-wide or enforcing TLS and SPF on every SMTP connect=
ion.  We should not conflate Bitcoin with other network protocols.  The B=
itcoin protocol is actually relatively easy to upgrade at this point.  Le=
t's take advantage of this fact.

On 06/11/14 15:36, Justus Ranvier wrote:
> Because Bitcoin has a extra consensus requirements, requirements which
> are really rare in engineering, the necessity of fixing bugs is even
> greater.

--=20
Be Happy :)


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