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Date: Fri, 06 Nov 2015 05:16:46 -0500
From: jl2012@xbt.hk
To: Tier Nolan <tier.nolan@gmail.com>
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Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev]
=?utf-8?q?Dealing_with_OP=5FIF_and_OP=5FNOTIF_malle?=
=?utf-8?q?ability?=
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I assume this proposal is implemented at the same time as BIP62. As long
as OP_IF/OP_NOTIF interprets the argument as a number, zero-padded
number and negative zero are already prohibited in BIP62
Tier Nolan via bitcoin-dev 於 2015-11-06 04:37 寫到:
> I meant not to use the OP_PUSH opcodes to do the push.
>
> Does OP_0 give a zero length byte array?
>
> Would this script return true?
>
> OP_0
>
> OP_PUSHDATA1 (length = 1, data = 0)
>
> OP_EQUAL
>
> The easiest definition is that OP_0 and OP_1 must be used to push the
> data and not any other push opcodes.
>
> On Fri, Nov 6, 2015 at 9:32 AM, Oleg Andreev <oleganza@gmail.com>
> wrote:
>
>>> One and zero should be defined as arrays of length one.
>> Otherwise, it is still possible to mutate the transaction by
>> changing the length of the array.
>>>
>>> They should also be minimally encoded but that is covered by
>> previous rules.
>>
>> These two lines contradict each other. Minimally-encoded "zero" is
>> an array of length zero, not one. I'd suggest defining this
>> explicitly here as "IF/NOTIF argument must be either zero-length
>> array or a single byte 0x01".
>
>
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> bitcoin-dev@lists.linuxfoundation.org
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