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>
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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
> >
>
>
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next prev parent 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 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
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