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From: "'Russell O'Connor' via Bitcoin Development Mailing List" <bitcoindev@googlegroups.com>
Date: Mon, 28 Apr 2025 12:13:01 -0400
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Subject: Re: [bitcoindev] Standard Unstructured Annex
To: Peter Todd <pete@petertodd.org>
Cc: bitcoindev@googlegroups.com
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Can you provide more details on how all inputs having an annex prevents
transaction pinning attacks in multi-party protocols?

From my naive understanding, in multi-party protocols one party can grief
by inflating the weight of their annex and broadcast their heavier /
lower-fee rate version of the transaction, and having an annex in all
inputs does not help this because one party can still change their own
annex, resign, and broadcast their heavier transaction.

However, I'm not up to date on the latest details about full RBF and
pinning attacks, so there is a good chance I'm missing something here.

On Wed, Mar 19, 2025 at 9:02=E2=80=AFPM Peter Todd <pete@petertodd.org> wro=
te:

> I'm working on adding support for the taproot annex to Libre Relay:
>
>
> https://github.com/petertodd/bitcoin/commit/04c8e449a34e74e048bf5751d1359=
2a22763ff7e
>
> I'm basing this on Joost Jager's pull-req:
> https://github.com/bitcoin/bitcoin/pull/27926
>
> Specifically, transactions containing taproot annexes will be standard
> if:
>
> 1) All non-empty annexes start with the byte 0x00, to distinguish them
>    from consensus-relevant annexes. This ensures that any use of the
>    annex will not conflict with future soft-forks that may assign
>    meaning to the annex.
>
> 2) All inputs have an annex. This ensures that use of the annex is
>    opt-in, preventing transaction pinning attacks in multi-party
>    protocols. This requirement may be relaxed in the future, eg to allow
>    spends of keyless outputs, and/or if RBF for witness-only
>    replacements is implemented.
>
> An example of a transaction meeting these requirements is:
>
>
> 010000000001011a559447098aaa14dec0c62ea55f43f9ce6bda07d1759f11b634334ab9d=
a939b0000000000ffffffff010000000000000000076a05616e6e657802406840b6fa27a00b=
a001cc92797ce4f3ab7b7a32c21d1fce49e893b42e506bd92e8db187966a84ef799915cf671=
334cc59779915b192bfb66b2afcf384bb61d0f422500049276d20616e20616e6e6578212041=
726520796f7520616e20616e6e65783f0000000000
>
> --
> https://petertodd.org 'peter'[:-1]@petertodd.org
>
> --
> You received this message because you are subscribed to the Google Groups
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.org
> .
>

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<div dir=3D"ltr"><div dir=3D"ltr"></div><div>Can you provide more details o=
n how all inputs having an annex prevents transaction pinning attacks in mu=
lti-party protocols?</div><div><br></div><div>From my naive understanding, =
in multi-party protocols one party can grief by inflating the weight of the=
ir annex and broadcast their heavier / lower-fee rate version of the transa=
ction, and having an annex in all inputs does not help this because one par=
ty can still change their own annex, resign, and broadcast their heavier tr=
ansaction.</div><div><br></div><div>However, I&#39;m not up to date on the =
latest details about full RBF and pinning attacks, so there is a good chanc=
e I&#39;m missing something here.</div><div><br></div><div class=3D"gmail_q=
uote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, M=
ar 19, 2025 at 9:02=E2=80=AFPM Peter Todd &lt;<a href=3D"mailto:pete@petert=
odd.org">pete@petertodd.org</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex">I&#39;m working on adding support for the taproo=
t annex to Libre Relay:<br>
<br>
<a href=3D"https://github.com/petertodd/bitcoin/commit/04c8e449a34e74e048bf=
5751d13592a22763ff7e" rel=3D"noreferrer" target=3D"_blank">https://github.c=
om/petertodd/bitcoin/commit/04c8e449a34e74e048bf5751d13592a22763ff7e</a><br=
>
<br>
I&#39;m basing this on Joost Jager&#39;s pull-req: <a href=3D"https://githu=
b.com/bitcoin/bitcoin/pull/27926" rel=3D"noreferrer" target=3D"_blank">http=
s://github.com/bitcoin/bitcoin/pull/27926</a><br>
<br>
Specifically, transactions containing taproot annexes will be standard<br>
if:<br>
<br>
1) All non-empty annexes start with the byte 0x00, to distinguish them<br>
=C2=A0 =C2=A0from consensus-relevant annexes. This ensures that any use of =
the<br>
=C2=A0 =C2=A0annex will not conflict with future soft-forks that may assign=
<br>
=C2=A0 =C2=A0meaning to the annex.<br>
<br>
2) All inputs have an annex. This ensures that use of the annex is<br>
=C2=A0 =C2=A0opt-in, preventing transaction pinning attacks in multi-party<=
br>
=C2=A0 =C2=A0protocols. This requirement may be relaxed in the future, eg t=
o allow<br>
=C2=A0 =C2=A0spends of keyless outputs, and/or if RBF for witness-only<br>
=C2=A0 =C2=A0replacements is implemented.<br>
<br>
An example of a transaction meeting these requirements is:<br>
<br>
010000000001011a559447098aaa14dec0c62ea55f43f9ce6bda07d1759f11b634334ab9da9=
39b0000000000ffffffff010000000000000000076a05616e6e657802406840b6fa27a00ba0=
01cc92797ce4f3ab7b7a32c21d1fce49e893b42e506bd92e8db187966a84ef799915cf67133=
4cc59779915b192bfb66b2afcf384bb61d0f422500049276d20616e20616e6e657821204172=
6520796f7520616e20616e6e65783f0000000000<br>
<br>
-- <br>
<a href=3D"https://petertodd.org" rel=3D"noreferrer" target=3D"_blank">http=
s://petertodd.org</a> &#39;peter&#39;[:-1]@<a href=3D"http://petertodd.org"=
 rel=3D"noreferrer" target=3D"_blank">petertodd.org</a><br>
<br>
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rtodd.org</a>.<br>
</blockquote></div></div>

<p></p>

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