From: Gregory Maxwell <gmaxwell@gmail•com>
To: Luke Dashjr <luke@dashjr•org>
Cc: Bitcoin Dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] [BIP] Normalized transaction IDs
Date: Wed, 21 Oct 2015 07:48:39 +0000 [thread overview]
Message-ID: <CAAS2fgT4DU1MuOwo0Qr4yMNRamajD=KrOVP93pzApWMpry-Srg@mail.gmail.com> (raw)
In-Reply-To: <201510210618.56159.luke@dashjr.org>
On Wed, Oct 21, 2015 at 6:18 AM, Luke Dashjr via bitcoin-dev
<bitcoin-dev@lists•linuxfoundation.org> wrote:
> On Monday, October 19, 2015 2:01:04 PM Christian Decker via bitcoin-dev wrote:
>> The proposal is implemented (see below), by computing the normalized
>> transaction ID when adding them to the UTXO and storing them along with the
>> coin state. OP_CHECKSIGEX mostly duplicates OP_CHECKSIG and
>> OP_CHECKMULTISIG, but I'm hoping somebody can give me some pointers into
>> how to best refactor the common functionality into reusable blocks. And the
>> annotating incoming transactions with their normalized inputs is a bit
>> cumbersome, maye somebody has some pointers here as well?
>
> 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.
>
> Additionally, you have a flag to control whether the opcode behaves as VERIFY
> or not. Non-VERIFY is not possible as a softfork (without doing a second/new
> P2SH) since it can be negated.
Flagability cannot work recursively which is necessary for any
improvement to be useful for multi-phase protocols. (which, I think,
is the only real application of this class of improvement-- third
party mutation can be prevented by enforced canonical encodings;)
One still wants sighash flags--, but they're going to inherently
result in malleability.
I'm still sad that uniform segregated witeness is so hard to deploy,
adding another id to every utxo set won't be a nice cost. :( But I
have been trying for a long time to come up with anything better and
not being successful.
next prev parent reply other threads:[~2015-10-21 7:48 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
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 [this message]
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
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