public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Gregory Maxwell <greg@xiph.org>
To: Pieter Wuille <pieter.wuille@gmail.com>,
	 Bitcoin Protocol Discussion
	<bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Should Graftroot be optional?
Date: Thu, 24 May 2018 02:08:07 +0000	[thread overview]
Message-ID: <CAAS2fgRXYtTyqqQp8Ehs_q_KsT7usA+vYSmngStnndd1rWNVNw@mail.gmail.com> (raw)
In-Reply-To: <CAPg+sBh4CESPV_5TpPn0H3Zpv2Ump_0txxS63W_S2f3Lxezq1A@mail.gmail.com>

On Thu, May 24, 2018 at 1:58 AM, Pieter Wuille via bitcoin-dev
<bitcoin-dev@lists.linuxfoundation.org> wrote:
> Thanks everyone who commented so far, but let me clarify the context
> of this question first a bit more to avoid getting into the weeds too
> much.

My understanding of the question is this:

Are there any useful applications which would be impeded if a signing
party who could authorize an arbitrary transaction spending a coin had
the option to instead sign a delegation to a new script?

The reason this question is interesting to ask is because the obvious
answer is "no":  since the signer(s) could have signed an arbitrary
transaction instead, being able to delegate is strictly less powerful.
Moreover, absent graftroot they could always "delegate" non-atomically
by spending the coin with the output being the delegated script that
they would have graftrooted instead.

Sometimes obvious answers have non-obvious counter examples, e.g.
Andrews points related to blindsigning are worth keeping in mind.


  reply	other threads:[~2018-05-24  2:08 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-22 18:17 [bitcoin-dev] Should Graftroot be optional? Pieter Wuille
2018-05-23  6:15 ` ZmnSCPxj
2018-05-23 13:50 ` Andrew Poelstra
2018-05-23 17:52   ` Andrew Poelstra
2018-05-25  9:46     ` Johnson Lau
2018-05-23 22:06 ` Natanael
2018-05-23 23:45   ` Gregory Maxwell
2018-05-24  9:32     ` Natanael
2018-05-24  1:58 ` Pieter Wuille
2018-05-24  2:08   ` Gregory Maxwell [this message]
2018-05-24  9:44     ` Natanael
2018-05-24 12:39       ` Andrew Poelstra
2018-05-25 10:14     ` Johnson Lau
2018-06-01  0:25       ` Pieter Wuille
2018-06-06 12:48         ` Tim Ruffing
2018-06-06 17:04           ` Pieter Wuille
2018-06-06 21:25             ` Tim Ruffing
2018-06-20 12:12               ` ZmnSCPxj
2018-06-20 14:30                 ` Gregory Maxwell
2018-06-21  7:09                   ` ZmnSCPxj
2018-06-27  7:29         ` Anthony Towns

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAAS2fgRXYtTyqqQp8Ehs_q_KsT7usA+vYSmngStnndd1rWNVNw@mail.gmail.com \
    --to=greg@xiph.org \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=pieter.wuille@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox