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From: Greg Sanders <gsanders87@gmail.com>
Date: Sat, 23 May 2020 11:25:06 -0400
Message-ID: <CAB3F3DtCgdWOPpTdr-cMcnRO1RE2isEAavGZSOTvtSi-0_x64w@mail.gmail.com>
To: Thomas Voegtlin <thomasv@electrum.org>, 
 Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Content-Type: multipart/alternative; boundary="00000000000070904105a6525a13"
Subject: Re: [bitcoin-dev] MIN_STANDARD_TX_NONWITNESS_SIZE and OP_RETURN
Precedence: list

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So I think the question to ask would be "why can't we just make sure it's
not 64?"

On Sat, May 23, 2020 at 11:24 AM Greg Sanders <gsanders87@gmail.com> wrote:

> AFAIU the number was picked to protect against CVE-2017-12842 covertly.
> See: https://github.com/bitcoin/bitcoin/pull/16885
> <https://github.com/bitcoin/bitcoin/pull/16885/files> which updated the
> text to explicitly mention this fact.
>
> On Sat, May 23, 2020 at 11:20 AM Thomas Voegtlin via bitcoin-dev <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
>> Hello list,
>>
>> I have been trying to CPFP a transaction using OP_RETURN, because the
>> remaining output value would have been lower than the dust threshold.
>>
>> The scriptPubkey of the output was OP_RETURN + OP_0, and there was a
>> single p2wsh input.
>>
>> The result is a 60 bytes transaction (without witness), that gets
>> rejected because it is lower than MIN_STANDARD_TX_NONWITNESS_SIZE, which
>> is equal to 82 bytes.
>>
>> Why is that value so high? Would it make sense to lower it to 60?
>>
>>
>> Thomas
>> _______________________________________________
>> bitcoin-dev mailing list
>> bitcoin-dev@lists.linuxfoundation.org
>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>>
>

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<div dir=3D"ltr">So I think the question to ask would be &quot;why can&#39;=
t we just make sure it&#39;s not 64?&quot;</div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, May 23, 2020 at 11:24 AM =
Greg Sanders &lt;<a href=3D"mailto:gsanders87@gmail.com">gsanders87@gmail.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr">AFAIU the number was picked to protect against=C2=A0CVE-=
2017-12842 covertly. See:=C2=A0<a href=3D"https://github.com/bitcoin/bitcoi=
n/pull/16885/files" target=3D"_blank">https://github.com/bitcoin/bitcoin/pu=
ll/16885</a>=C2=A0which updated the text to explicitly mention this fact.</=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Sat, May 23, 2020 at 11:20 AM Thomas Voegtlin via bitcoin-dev &lt;<a href=
=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">bitcoin=
-dev@lists.linuxfoundation.org</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex">Hello list,<br>
<br>
I have been trying to CPFP a transaction using OP_RETURN, because the<br>
remaining output value would have been lower than the dust threshold.<br>
<br>
The scriptPubkey of the output was OP_RETURN + OP_0, and there was a<br>
single p2wsh input.<br>
<br>
The result is a 60 bytes transaction (without witness), that gets<br>
rejected because it is lower than MIN_STANDARD_TX_NONWITNESS_SIZE, which<br=
>
is equal to 82 bytes.<br>
<br>
Why is that value so high? Would it make sense to lower it to 60?<br>
<br>
<br>
Thomas<br>
_______________________________________________<br>
bitcoin-dev mailing list<br>
<a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">=
bitcoin-dev@lists.linuxfoundation.org</a><br>
<a href=3D"https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev" =
rel=3D"noreferrer" target=3D"_blank">https://lists.linuxfoundation.org/mail=
man/listinfo/bitcoin-dev</a><br>
</blockquote></div>
</blockquote></div>

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