From: Luke Dashjr <luke@dashjr•org>
To: Christian Decker <decker.christian@gmail•com>
Cc: bitcoin-dev@lists•linuxfoundation.org
Subject: Re: [bitcoin-dev] [BIP] Normalized transaction IDs
Date: Wed, 21 Oct 2015 08:39:41 +0000 [thread overview]
Message-ID: <201510210839.42420.luke@dashjr.org> (raw)
In-Reply-To: <CALxbBHVnb-bLx47RcST0ZP2pg2YPzC5TvCDjL1qXqEQLN2qSGA@mail.gmail.com>
On Wednesday, October 21, 2015 8:31:42 AM Christian Decker wrote:
> On Wed, Oct 21, 2015 at 9:52 AM Luke Dashjr <luke@dashjr•org> wrote:
> > On Wednesday, October 21, 2015 7:39:45 AM Christian Decker wrote:
> > > On Wed, Oct 21, 2015 at 8:19 AM Luke Dashjr <luke@dashjr•org> wrote:
> > > > This doesn't completely close malleability (which should be
> > > > documented
> >
> > in
> >
> > > > the BIP), so I'm not sure it's worth the cost, especially if closing
> > > > malleability later on would need more. How about specifying flags
> >
> > upfront
> >
> > > > in the UTXO-creating transaction specifying which parts the signature
> > > > will cover? This would allow implementation of fully
> > > > malleability-proof wallets.
> > >
> > > As far as I see it the only remaining venues for malleability are the
> > > use of sighash flags that are not SIGHASH_ALL, as mentioned in the
> > > BIP. Any
> >
> > use
> >
> > > of non-sighash_all flags is already an explicit permission to modify
> > > the transactions, by adding and removing inputs and outputs, so I
> > > don't see
> >
> > how
> >
> > > these can be made non-malleable. Am I missing something?
> >
> > Signer malleability is still a notable concern needing consideration.
> > Ideally,
> > wallets should be trying to actively CoinJoin, bump fees on, etc any
> > pending
> > transactions in the background. These forms of malleability affect nearly
> > as
> > many real use cases as third-party malleability.
> >
> > Luke
>
> How is signer malleability still a problem if we remove the signatures from
> the transaction ID of the transaction and all preceding transactions? The
> signer can re-sign a transaction but it won't change the transaction ID.
The signer can also change the order of the inputs, the inputs themselves,
add/remove outputs, etc... all which should be possible without becoming a
different logical transaction. The only unique property of the logical
transaction is the scriptPubKey/address.
Luke
next prev parent reply other threads:[~2015-10-21 8:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-19 14:01 Christian Decker
2015-10-19 15:23 ` Tier Nolan
2015-10-19 19:28 ` Christian Decker
2015-10-19 22:22 ` s7r
2015-10-20 10:30 ` Christian Decker
2015-10-21 6:18 ` Luke Dashjr
2015-10-21 7:39 ` Christian Decker
2015-10-21 7:52 ` Luke Dashjr
2015-10-21 8:31 ` Christian Decker
2015-10-21 8:39 ` Luke Dashjr [this message]
2015-10-21 8:44 ` Christian Decker
2015-10-21 8:46 ` Luke Dashjr
2015-10-21 18:22 ` Danny Thorpe
2015-10-21 19:27 ` Gregory Maxwell
2015-10-21 23:20 ` Luke Dashjr
2015-10-22 8:26 ` Christian Decker
2015-10-22 8:57 ` Gregory Maxwell
2015-10-22 11:54 ` Christian Decker
2015-10-22 9:05 ` Luke Dashjr
2015-11-03 20:37 ` Christian Decker
2015-11-03 20:48 ` Luke Dashjr
2015-11-03 21:44 ` Christian Decker
2015-11-03 22:01 ` Luke Dashjr
2015-11-05 15:27 ` Jorge Timón
2015-11-05 19:36 ` Luke Dashjr
2015-11-05 20:25 ` Jorge Timón
2015-11-05 22:46 ` s7r
2015-11-05 22:29 ` Adam Back
2015-11-06 14:52 ` Christian Decker
2015-11-04 4:00 ` Peter Todd
2015-11-05 9:38 ` Christian Decker
2015-10-21 7:48 ` Gregory Maxwell
2015-10-21 8:26 ` Gregory Maxwell
2015-10-21 8:49 ` Christian Decker
2015-10-21 8:50 ` Christian Decker
2015-10-21 10:14 ` Gregory Maxwell
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=201510210839.42420.luke@dashjr.org \
--to=luke@dashjr$(echo .)org \
--cc=bitcoin-dev@lists$(echo .)linuxfoundation.org \
--cc=decker.christian@gmail$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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