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From: Jonathan Toomim <j@toom.im>
In-Reply-To: <5666FD8D.8050201@openbitcoinprivacyproject.org>
Date: Wed, 9 Dec 2015 07:40:42 +0800
Message-Id: <2030FF3C-4F65-44E6-A9D5-9CD144179994@toom.im>
References: <CAAS2fgQyVs1fAEj+vqp8E2=FRnqsgs7VUKqALNBHNxRMDsHdVg@mail.gmail.com>
	<20151208110752.GA31180@amethyst.visucore.com>
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	<5666FD8D.8050201@openbitcoinprivacyproject.org>
To: Justus Ranvier <justus@openbitcoinprivacyproject.org>
Cc: bitcoin-dev@lists.linuxfoundation.org
Subject: Re: [bitcoin-dev] Capacity increases for the Bitcoin system.
Precedence: list


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Agree. This data does not belong in the coinbase. That space is for =
miners to use, not devs.

I also think that a hard fork is better for SegWit, as it reduces the =
size of fraud proofs considerably, makes the whole design more elegant =
and less kludgey, and is safer for clients who do not upgrade in a =
timely fashion. I don't like the idea that SegWit would invalidate the =
security assumptions of non-upgraded clients (including SPV wallets). I =
think that for these clients, no data is better than invalid data. =
Better to force them to upgrade by cutting them off the network than to =
let them think they're validating transactions when they're not.


On Dec 8, 2015, at 11:55 PM, Justus Ranvier via bitcoin-dev =
<bitcoin-dev@lists.linuxfoundation.org> wrote:

> If such a change is going to be deployed via a soft fork instead of a
> hard fork, then the coinbase is the worst place to put the segwitness
> merkle root.
>=20
> Instead, put it in the first output of the generation transaction as =
an
> OP_RETURN script.
>=20
> This is a better pattern because coinbase space is limited while =
output
> space is not. The next time there's a good reason to tie another =
merkle
> tree to a block, that proposal can be designated for the second output
> of the generation transaction.


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