Date: Wed, 5 Apr 2017 22:49:10 -0400
From: Peter Todd <pete@petertodd.org>
To: Bram Cohen <bram@bittorrent.com>
Message-ID: <20170406024910.GA1271@savin.petertodd.org>
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	<20170406023123.GA1071@savin.petertodd.org>
	<CA+KqGkqSxeAUZFVFqM_QkEWcGFHgZXwGuOE==7HpXp1+D_Tj3Q@mail.gmail.com>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP proposal: Inhibiting a covert attack on the
 Bitcoin POW function
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On Wed, Apr 05, 2017 at 07:39:08PM -0700, Bram Cohen wrote:
> On Wed, Apr 5, 2017 at 7:31 PM, Peter Todd via bitcoin-dev <
> > While I'm in favour of blocking covert usage of ASICBOOST, there's every
> > reason
> > to block non-covert usage of it as well. In a low margin business like
> > mining,
> > the advatange it gives is enormous - quite possibly 10x your profit mar=
gin
> > -
> > and given that barrier free access to being able to purchase ASICs is
> > already
> > an archilles heal for Bitcoin there is every reason to eliminate this l=
egal
> > vulnerability. Additionally, it's a technical vulnerability as well: we
> > want
> > getting into the ASIC manufacturing and design business to have as low
> > barriers
> > to entry as is feasible, and the ASICBOOST exploit significantly increa=
ses
> > the
> > minimum capital requirements to do so.
> >
>=20
> Asicboost also has the problem that it isn't treating the hashing as a
> black box, and thus has impacts on what gets mined. In particular it
> creates an incentive to make blocks smaller. That's a very unwanted effec=
t,
> and anything like it should be engineered out on principle.

Agreed! There's no benefit to Bitcoin for having it - one way or the other
miners are going to destroy ~12BTC/block worth of energy. Meanwhile it appe=
ars
to have lead to something like a year of stupid political bullshit based on=
 a
secret advantage - there's no reason to invite a repeat of this episode.

--=20
https://petertodd.org 'peter'[:-1]@petertodd.org

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