Re: [bitcoin-dev] Miners forced to run non-core code in order to get segwit activated

From: "Hampus Sjöberg" <hampus.sjoberg@gmail•com>
To: Gregory Maxwell <greg@xiph•org>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Miners forced to run non-core code in order to get segwit activated
Date: Wed, 21 Jun 2017 00:15:59 +0200	[thread overview]
Message-ID: <CAFMkqK_73RrpaS2oJQ-0o6oC29m6a1h411_P7HmVcAyX712Sgw@mail.gmail.com> (raw)
In-Reply-To: <CAAS2fgSZ_X3G7j3-S6tAGPe2TOTT2umBB8a0RHpD-wAHN9aPgw@mail.gmail.com>

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> Ironically, it looks like most of the segwit2x signaling miners are
> faking it (because they're not signaling segwit which it requires).
> It'll be unfortunate if some aren't faking it and start orphaning
> their own blocks because they are failing to signal segwit.

Well, they're doing some kind of "pre-signaling" in the coinbase at the
moment, because the segwit2x project is still in alpha-phase according to
the timeline. They're just showing commitment.
I'm sure they will begin signaling on version bit 4/BIP91 as well as
actually running a segwit2x node when the time comes.

> As far as prevent a chain split goes, all those things
> (148/91/segwit2x(per today)) effectively guarantee a chainsplit-- so I
> don't think that holds.

Segwit2x/BIP91/BIP148 will orphan miners that do not run a Segwit2x (or
BIP148) node, because they wouldn't have the new consensus rule of
requiring all blocks to signal for segwit.
I don't believe there would be any long lasting chainsplit though (because
of the ~80% hashrate support on segwit2x), perhaps 2-3 blocks if we get
unlucky.

Hampus

2017-06-20 23:49 GMT+02:00 Gregory Maxwell via bitcoin-dev <
bitcoin-dev@lists•linuxfoundation.org>:

> On Tue, Jun 20, 2017 at 3:44 PM, Erik Aronesty via bitcoin-dev
> <bitcoin-dev@lists•linuxfoundation.org> wrote:
> > Because a large percentage of miners are indifferent, right now miners
> have
> > to choose between BIP148 and Segwit2x if they want to activate Segwit.
>
> Miners can simply continuing signaling segwit, which will leave them
> at least soft-fork compatible with BIP148 and BIP91 (and god knows
> what "segwit2x" is since they keep changing the actual definition and
> do not have a specification; but last I saw the near-term behavior the
> same as BIP91 but with a radically reduced activation window, so the
> story would be the same there in the near term).
>
> Ironically, it looks like most of the segwit2x signaling miners are
> faking it (because they're not signaling segwit which it requires).
> It'll be unfortunate if some aren't faking it and start orphaning
> their own blocks because they are failing to signal segwit.
>
> I don't think the rejection of segwit2x from Bitcoin's developers
> could be any more resolute than what we've already seen:
> https://en.bitcoin.it/wiki/Segwit_support
>
> On Tue, Jun 20, 2017 at 5:22 PM, Mark Friedenbach via bitcoin-dev
> <bitcoin-dev@lists•linuxfoundation.org> wrote:
> > I think it is very naïve to assume that any shift would be temporary.
> > We have a hard enough time getting miners to proactively upgrade to
> > recent versions of the reference bitcoin daemon. If miners interpret
> > the situation as being forced to run non-reference software in order
> > to prevent a chain split because a lack of support from Bitcoin Core,
> > that could be a one-way street.
>
> I think this is somewhat naive and sounds a lot like the repeat of the
> previously debunked "XT" and "Classic" hysteria.
>
> There is a reason that segwit2x is pretty much unanimously rejected by
> the technical community.  And just like with XT/Classic/Unlimited
> you'll continue to see a strong correlation with people who are
> unwilling and unable to keep updating the software at an acceptable
> level of quality-- esp. because the very founding on their fork is
> predicated on discarding those properties.
>
> If miners want to go off and create an altcoin-- welp, thats something
> they can always do,  and nothing about that will force anyone to go
> along with it.
>
> As far as prevent a chain split goes, all those things
> (148/91/segwit2x(per today)) effectively guarantee a chainsplit-- so I
> don't think that holds.
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