public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Mark Friedenbach <mark@friedenbach.org>
To: s7r@sky-ip.org
Cc: Bitcoin Development <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] 75%/95% threshold for transaction versions
Date: Thu, 16 Apr 2015 10:34:31 -0700	[thread overview]
Message-ID: <CAOG=w-vMjysbF5H8wWN2y45U3djFwpKMtXq3vCvB=-eFr7GqFg@mail.gmail.com> (raw)
In-Reply-To: <552FDF73.6010104@sky-ip.org>

[-- Attachment #1: Type: text/plain, Size: 3146 bytes --]

At this moment anyone can alter the txid. Assume transactions are 100%
malleable.
On Apr 16, 2015 9:13 AM, "s7r" <s7r@sky-ip.org> wrote:

> Hi Pieter,
>
> Thanks for your reply. I agree. Allen has a good point in the previous
> email too, so the suggestion might not fix anything and complicate things.
>
> The problem I am trying to solve is making all transactions
> non-malleable by default. I guess there is a very good reason why BIP62
> will not touch v1 anyway.
>
> I am trying to build a bitcoin contract which will relay on 3 things:
> - coinjoin / txes with inputs from multiple users which are signed by
> all users after they are merged together (every user is sure his coins
> will not be spent without the other users to spend anything, as per
> agreed contract);
> - pre-signed txes with nLockTime 'n' weeks. These txes will be signed
> before the inputs being spent are broadcasted/confirmed, using the txid
> provided by the user before broadcasting it. Malleability hurts here.
> - P2SH
>
> In simple terms, how malleable transactions really are in the network at
> this moment? Who can alter a txid without invalidating the tx? Just the
> parties who sign it? The miners? Anyone in the network? This is a little
> bit unclear to me.
>
> Another thing I would like to confirm, the 3 pieces of the bitcoin
> protocol mentioned above will be supported in _any_ future transaction
> version or block version, regardless what changes are made or features
> added to bitcoin core? The contract needs to be built and left unchanged
> for a very very long period of time...
>
>
> On 4/16/2015 8:22 AM, Pieter Wuille wrote:
> >
> > On Apr 16, 2015 1:46 AM, "s7r" <s7r@sky-ip.org <mailto:s7r@sky-ip.org>>
> > wrote:
> >> but for transaction versions? In simple terms, if > 75% from all the
> >> transactions in the latest 1000 blocks are version 'n', mark all
> >> previous transaction versions as non-standard and if > 95% from all the
> >> transactions in the latest 1000 blocks are version 'n' mark all previous
> >> transaction versions as invalid.
> >
> > What problem are you trying to solve?
> >
> > The reason why BIP62 (as specified, it is just a draft) does not make v1
> > transactions invalid is because it is opt-in. The creator of a
> > transaction needs to agree to protect it from malleability, and this
> > subjects him to extra rules in the creation.
> >
> > Forcing v3 transactions would require every piece of wallet software to
> > be changed.
> >
> > --
> > Pieter
> >
>
>
> ------------------------------------------------------------------------------
> BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> Develop your own process in accordance with the BPMN 2 standard
> Learn Process modeling best practices with Bonita BPM through live
> exercises
> http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual-
> event?utm_
> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>

[-- Attachment #2: Type: text/html, Size: 4046 bytes --]

  reply	other threads:[~2015-04-16 18:05 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-15 23:43 [Bitcoin-development] 75%/95% threshold for transaction versions s7r
2015-04-16  2:04 ` Allen Piscitello
2015-04-16  5:22 ` Pieter Wuille
2015-04-16 16:12   ` s7r
2015-04-16 17:34     ` Mark Friedenbach [this message]
2015-04-16 23:17       ` s7r
2015-04-17  9:02         ` Pieter Wuille
2015-04-18 14:49           ` s7r
2015-04-24  8:55             ` Jorge Timón
2015-04-24  8:58               ` Jorge Timón
2015-04-24 19:58     ` William Swanson
2015-04-24 20:16       ` Gregory Maxwell
2015-04-25 15:40         ` Stephen Morse
2015-04-26  0:01           ` s7r
2015-04-26  6:51             ` Joseph Poon
2015-04-26 16:48               ` Joseph Poon
2015-04-25 14:32       ` Stephen Morse
2015-04-27 19:21         ` Peter Todd
2015-04-28 10:17           ` Oleg Andreev

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='CAOG=w-vMjysbF5H8wWN2y45U3djFwpKMtXq3vCvB=-eFr7GqFg@mail.gmail.com' \
    --to=mark@friedenbach.org \
    --cc=bitcoin-development@lists.sourceforge.net \
    --cc=s7r@sky-ip.org \
    /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