From: Luke Dashjr <luke@dashjr•org>
To: bitcoin-development@lists•sourceforge.net
Subject: Re: [Bitcoin-development] [BIP] Normalized Transaction IDs
Date: Wed, 13 May 2015 16:34:52 +0000 [thread overview]
Message-ID: <201505131634.53563.luke@dashjr.org> (raw)
In-Reply-To: <CALxbBHUnt7ToVK9reH6W6uT4HV=7NbxGHyNWWa-OEHg+Z1+qOg@mail.gmail.com>
I think this hardfork is dead-on-arrival given the ideas for OP_CHECKSIG
softforking. Instead of referring to previous transactions by a normalised
hash, it makes better sense to simply change the outpoints in the signed data
and allow nodes to hotfix dependent transactions when/if they are malleated.
Furthermore, the approach of using a hash of scriptPubKey in the input rather
than an outpoint also solves dependencies in the face of intentional
malleability (respending with a higher fee, or CoinJoin, for a few examples).
These aren't barriers to making the proposal or being assigned a BIP number if
you want to go forward with that, but you may wish to reconsider spending time
on it.
Luke
On Wednesday, May 13, 2015 12:48:04 PM Christian Decker wrote:
> Hi All,
>
> I'd like to propose a BIP to normalize transaction IDs in order to address
> transaction malleability and facilitate higher level protocols.
>
> The normalized transaction ID is an alias used in parallel to the current
> (legacy) transaction IDs to address outputs in transactions. It is
> calculated by removing (zeroing) the scriptSig before computing the hash,
> which ensures that only data whose integrity is also guaranteed by the
> signatures influences the hash. Thus if anything causes the normalized ID
> to change it automatically invalidates the signature. When validating a
> client supporting this BIP would use both the normalized tx ID as well as
> the legacy tx ID when validating transactions.
>
> The detailed writeup can be found here:
> https://github.com/cdecker/bips/blob/normalized-txid/bip-00nn.mediawiki.
>
> @gmaxwell: I'd like to request a BIP number, unless there is something
> really wrong with the proposal.
>
> In addition to being a simple alternative that solves transaction
> malleability it also hugely simplifies higher level protocols. We can now
> use template transactions upon which sequences of transactions can be built
> before signing them.
>
> I hesitated quite a while to propose it since it does require a hardfork
> (old clients would not find the prevTx identified by the normalized
> transaction ID and deem the spending transaction invalid), but it seems
> that hardforks are no longer the dreaded boogeyman nobody talks about.
> I left out the details of how the hardfork is to be done, as it does not
> really matter and we may have a good mechanism to apply a bunch of
> hardforks concurrently in the future.
>
> I'm sure it'll take time to implement and upgrade, but I think it would be
> a nice addition to the functionality and would solve a long standing
> problem :-)
>
> Please let me know what you think, the proposal is definitely not set in
> stone at this point and I'm sure we can improve it further.
>
> Regards,
> Christian
next prev parent reply other threads:[~2015-05-13 16:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-13 12:48 Christian Decker
2015-05-13 13:12 ` Tier Nolan
2015-05-13 13:41 ` Gavin Andresen
2015-05-13 15:24 ` Christian Decker
2015-05-13 16:18 ` Tier Nolan
2015-05-13 16:34 ` Luke Dashjr [this message]
2015-05-13 17:14 ` Pieter Wuille
2015-05-13 18:04 ` Christian Decker
2015-05-13 18:40 ` Pieter Wuille
2015-05-13 19:14 ` Christian Decker
2015-05-13 19:40 ` Pieter Wuille
2015-05-13 18:11 ` Tier Nolan
2015-05-13 20:27 ` Tier Nolan
2015-05-13 20:31 ` Pieter Wuille
2015-05-13 20:32 ` Tier Nolan
2015-05-14 0:37 ` Pieter Wuille
2015-05-14 11:01 ` Christian Decker
2015-05-14 11:26 ` Christian Decker
2015-05-15 9:54 ` s7r
2015-05-15 10:45 ` Tier Nolan
2015-05-15 16:31 ` Luke Dashjr
2015-05-16 3:58 ` Stephen
2015-05-16 10:52 ` Tier Nolan
2015-05-19 8:28 ` Christian Decker
2015-05-19 9:13 ` Tier Nolan
2015-05-19 10:43 ` Christian Decker
2015-05-19 12:48 ` Stephen Morse
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