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Date: Tue, 18 Jun 2024 08:13:44 +0000
To: Eric Voskuil <eric@voskuil.org>
From: "'Antoine Poinsot' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Cc: Bitcoin Development Mailing List <bitcoindev@googlegroups.com>
Subject: Re: [bitcoindev] Re: Great Consensus Cleanup Revival
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Hi Eric,

It is. This is what is implemented in Bitcoin Core, see [this snippet](http=
s://github.com/bitcoin/bitcoin/blob/41544b8f96dbc9c6b8998acd6522200d67cdc16=
d/src/validation.cpp#L4547-L4552) and section 4.1 of the document you refer=
ence:

> Another check that was also being done in CheckBlock() relates to the coi=
nbase transaction: if the first transaction in a block fails the required s=
tructure of a coinbase =E2=80=93 one input, with previous output hash of al=
l zeros and index of all ones =E2=80=93 then the block will fail validation=
. The side effect of this test being in CheckBlock() was that even though t=
he block malleability discussed in section 3.1 was unknown, we were effecti=
vely protected against it =E2=80=93 as described above, it would take at le=
ast 224 bits of work to produce a malleated block that passed the coinbase =
check.

Best,
Antoine
On Tuesday, June 18th, 2024 at 12:15 AM, Eric Voskuil <eric@voskuil.org> wr=
ote:

> Hi Antoine,
>
> Regarding potential malleability pertaining to blocks with only 64 byte t=
ransactions, why is not a deserialization phase check for the coinbase inpu=
t as a null point not sufficient mitigation (computational infeasibility) f=
or any implementation that desires to perform permanent invalidity marking?
>
> Best,
> Eric
>
> ref: [Weaknesses in Bitcoin=E2=80=99s Merkle Root Construction](https://l=
ists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20190225/a27d883=
7/attachment-0001.pdf)
>
> --
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 "Bitcoin Development Mailing List" group.
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<div style=3D"font-family: Arial, sans-serif; font-size: 14px; color: rgb(0=
, 0, 0); background-color: rgb(255, 255, 255);">Hi Eric,</div><div style=3D=
"font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); back=
ground-color: rgb(255, 255, 255);"><br></div><div style=3D"font-family: Ari=
al, sans-serif; font-size: 14px; color: rgb(0, 0, 0); background-color: rgb=
(255, 255, 255);">It is. This is what is implemented in Bitcoin Core, see <=
a href=3D"https://github.com/bitcoin/bitcoin/blob/41544b8f96dbc9c6b8998acd6=
522200d67cdc16d/src/validation.cpp#L4547-L4552" title=3D"this snippet">this=
 snippet</a> and section 4.1 of the document you reference:</div><blockquot=
e style=3D"border-color: rgb(200, 200, 200); border-left: 3px solid rgb(200=
, 200, 200); padding-left: 10px; color: rgb(102, 102, 102);"><div style=3D"=
font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); backg=
round-color: rgb(255, 255, 255);"><span>Another check that was also being d=
one in </span><span>CheckBlock() relates to the coinbase transaction: if th=
e first transaction in a </span><span>block fails the required structure of=
 a coinbase =E2=80=93 one input, with previous output </span><span>hash of =
all zeros and index of all ones =E2=80=93 then the block will fail validati=
on. The </span><span>side effect of this test being in CheckBlock() was tha=
t even though the block </span><span>malleability discussed in section 3.1 =
was unknown, we were effectively protected </span><span>against it =E2=80=
=93 as described above, it would take at least 224 bits of work to produce<=
/span><span> a malleated block that passed the coinbase check.</span><br></=
div></blockquote><div style=3D"font-family: Arial, sans-serif; font-size: 1=
4px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><br></div>=
<div style=3D"font-family: Arial, sans-serif; font-size: 14px; color: rgb(0=
, 0, 0); background-color: rgb(255, 255, 255);">Best,<br></div><div style=
=3D"font-family: Arial, sans-serif; font-size: 14px; color: rgb(0, 0, 0); b=
ackground-color: rgb(255, 255, 255);">Antoine<br></div><div class=3D"proton=
mail_quote">
        On Tuesday, June 18th, 2024 at 12:15 AM, Eric Voskuil &lt;eric@vosk=
uil.org&gt; wrote:<br>
        <blockquote class=3D"protonmail_quote" type=3D"cite">
            Hi Antoine,<br><br>Regarding potential malleability pertaining =
to blocks with only 64 byte transactions, why is not a deserialization phas=
e check for the coinbase input as a null point not sufficient mitigation (c=
omputational infeasibility) for any implementation that desires to perform =
permanent invalidity marking?<br><br>Best,<br>Eric<div><br></div><div>ref: =
<a href=3D"https://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachme=
nts/20190225/a27d8837/attachment-0001.pdf" rel=3D"noreferrer nofollow noope=
ner" target=3D"_blank">Weaknesses in Bitcoin=E2=80=99s Merkle Root Construc=
tion</a><br></div>

<p></p>

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egroups.com</a>.<br>

        </blockquote><br>
    </div>

<p></p>

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