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<E2219CF0-4044-42BC-B782-69DCFF33A5A0@sprovoost.nl>
In-Reply-To: <E2219CF0-4044-42BC-B782-69DCFF33A5A0@sprovoost.nl>
From: Greg Sanders <gsanders87@gmail.com>
Date: Thu, 25 Nov 2021 00:00:42 +0800
Message-ID: <CAB3F3DuR3fETgD=h0cWZ_j6XcNRqHub_KReNj3-oa7DhaCq-iQ@mail.gmail.com>
To: Sjors Provoost <sjors@sprovoost.nl>,
Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] Taproot Fields for PSBT
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I may be misunderstanding the question, but it seems essential data for the
finalizer role, which may not know such information on its own.
On Wed, Nov 24, 2021 at 11:15 PM Sjors Provoost via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:
> Hi Andrew,
>
> I'm confused why PSBT_IN_TAP_BIP32_DERIVATION and
> PSBT_OUT_TAP_BIP32_DERIVATION
> contain not just the derivation path for the xonlypubkey, but also the
> tapleaf merkle path.
>
> First I thought it was perhaps necessary in order for a signer to guess
> which
> script leaves it can sign with its own keys. But you can't really know
> that without
> actually seeing the script. When a signer looks at a script, it presumably
> already
> knows the leaf path.
>
> - Sjors
>
> Op 22 jun. 2021, om 23:22 heeft Andrew Chow via bitcoin-dev <
> bitcoin-dev@lists.linuxfoundation.org> het volgende geschreven:
>
> Hi All,
>
> I would like to propose a BIP which defines new fields for Taproot
> support in PSBT.
>
> The full text is below, and the rendered file can be found at
>
>
> Now at: https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki
>
> -
> | Taproot Key BIP 32 Derivation Path
> | <tt>PSBT_IN_TAP_BIP32_DERIVATION = 0x16</tt>
> | <tt><xonlypubkey></tt>
> | The 32 byte X-only public key
> | <tt><hashes len> <leaf hash>* <32-bit uint> <32-bit uint>*</tt>
> | A compact size unsigned integer representing the number of leaf
> hashes, followed by a list of leaf hashes, followed by the master key
> fingerprint concatenated with the derivation path of the public key. The
> derivation path is represented as 32-bit little endian unsigned integer
> indexes concatenated with each other. Public keys are those needed to
> spend this output. The leaf hashes are of the leaves which involve this
> public key.
>
>
> |-
> | Taproot Key BIP 32 Derivation Path
> | <tt>PSBT_OUT_TAP_BIP32_DERIVATION = 0x07</tt>
> | <tt><xonlypubkey></tt>
> | The 32 byte X-only public key
> | <tt><hashes len> <leaf hash>* <32-bit uint> <32-bit uint>*</tt>
>
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>
--00000000000066b41605d18af6f9
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">I may be misunderstanding the question, but it seems essen=
tial data for the finalizer role, which may not know such information on it=
s own.</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Wed, Nov 24, 2021 at 11:15 PM Sjors Provoost via bitcoin-dev <<=
a href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org">bitcoin-dev@lists.l=
inuxfoundation.org</a>> wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex"><div style=3D"overflow-wrap: break-word;">Hi Andrew,<div>=
<br></div><div>I'm confused why PSBT_IN_TAP_BIP32_DERIVATION and PSBT_O=
UT_TAP_BIP32_DERIVATION</div><div>contain not just the derivation path for =
the xonlypubkey, but also the tapleaf merkle path.</div><div><br></div><div=
>First I thought it was perhaps necessary in order for a signer to guess wh=
ich</div><div>script leaves it can sign with its own keys. But you can'=
t really know that without</div><div>actually seeing the script. When a sig=
ner looks at a script, it presumably already</div><div>knows the leaf path.=
</div><div><br></div><div>- Sjors<br><div><br><blockquote type=3D"cite"><di=
v>Op 22 jun. 2021, om 23:22 heeft Andrew Chow via bitcoin-dev <<a href=
=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" target=3D"_blank">bitcoin=
-dev@lists.linuxfoundation.org</a>> het volgende geschreven:</div><br><d=
iv><div>Hi All,<br><br>I would like to propose a BIP which defines new fiel=
ds for Taproot<br>support in PSBT.<br><br>The full text is below, and the r=
endered file can be found at<br></div></div></blockquote><div><br></div><di=
v>Now at:=C2=A0<a href=3D"https://github.com/bitcoin/bips/blob/master/bip-0=
174.mediawiki" target=3D"_blank">https://github.com/bitcoin/bips/blob/maste=
r/bip-0174.mediawiki</a></div><div><br></div><blockquote type=3D"cite"><div=
><div>-<br>| Taproot Key BIP 32 Derivation Path<br>| <tt>PSBT_IN_TAP_=
BIP32_DERIVATION =3D 0x16</tt><br>| <tt><xonlypubkey><=
/tt><br>| The 32 byte X-only public key<br>| <tt><hashes len>=
; <leaf hash>* <32-bit uint> <32-bit uint>*</tt><br=
>| A compact size unsigned integer representing the number of leaf<br>hashe=
s, followed by a list of leaf hashes, followed by the master key<br>fingerp=
rint concatenated with the derivation path of the public key. The<br>deriva=
tion path is represented as 32-bit little endian unsigned integer<br>indexe=
s concatenated with each other. Public keys are those needed to<br>spend th=
is output. The leaf hashes are of the leaves which involve this<br>public k=
ey.<br></div></div></blockquote><br><blockquote type=3D"cite"><div><div>|-<=
br>| Taproot Key BIP 32 Derivation Path<br>| <tt>PSBT_OUT_TAP_BIP32_D=
ERIVATION =3D 0x07</tt><br>| <tt><xonlypubkey></tt>=
<br>| The 32 byte X-only public key<br>| <tt><hashes len> <l=
eaf hash>* <32-bit uint> <32-bit uint>*</tt><br><br></=
div></div></blockquote></div><br></div></div>______________________________=
_________________<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>
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