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From: Sjors Provoost <sjors@sprovoost.nl>
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Date: Wed, 24 Nov 2021 13:44:46 +0100
References: <795f917b-3883-1827-f39b-35123b500f36@achow101.com>
To: Andrew Chow <achow101-lists@achow101.com>,
Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
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Subject: Re: [bitcoin-dev] Taproot Fields for PSBT
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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:
>=20
> Hi All,
>=20
> I would like to propose a BIP which defines new fields for Taproot
> support in PSBT.
>=20
> 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 =
<https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki>
> -
> | Taproot Key BIP 32 Derivation Path
> | <tt>PSBT_IN_TAP_BIP32_DERIVATION =3D 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 =3D 0x07</tt>
> | <tt><xonlypubkey></tt>
> | The 32 byte X-only public key
> | <tt><hashes len> <leaf hash>* <32-bit uint> <32-bit uint>*</tt>
>=20
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charset=us-ascii
<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Andrew,<div class=3D""><br class=3D""></div><div class=3D"">I'm confused =
why PSBT_IN_TAP_BIP32_DERIVATION and =
PSBT_OUT_TAP_BIP32_DERIVATION</div><div class=3D"">contain not just the =
derivation path for the xonlypubkey, but also the tapleaf merkle =
path.</div><div class=3D""><br class=3D""></div><div class=3D"">First I =
thought it was perhaps necessary in order for a signer to guess =
which</div><div class=3D"">script leaves it can sign with its own keys. =
But you can't really know that without</div><div class=3D"">actually =
seeing the script. When a signer looks at a script, it presumably =
already</div><div class=3D"">knows the leaf path.</div><div class=3D""><br=
class=3D""></div><div class=3D"">- Sjors<br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">Op 22 =
jun. 2021, om 23:22 heeft Andrew Chow via bitcoin-dev <<a =
href=3D"mailto:bitcoin-dev@lists.linuxfoundation.org" =
class=3D"">bitcoin-dev@lists.linuxfoundation.org</a>> het volgende =
geschreven:</div><br class=3D"Apple-interchange-newline"><div =
class=3D""><div class=3D"">Hi All,<br class=3D""><br class=3D"">I would =
like to propose a BIP which defines new fields for Taproot<br =
class=3D"">support in PSBT.<br class=3D""><br class=3D"">The full text =
is below, and the rendered file can be found at<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Now =
at: <a =
href=3D"https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki" =
class=3D"">https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki<=
/a></div><div><br class=3D""></div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">-<br class=3D"">| Taproot Key =
BIP 32 Derivation Path<br class=3D"">| =
<tt>PSBT_IN_TAP_BIP32_DERIVATION =3D 0x16</tt><br class=3D"">|=
<tt><xonlypubkey></tt><br class=3D"">| The 32 byte =
X-only public key<br class=3D"">| <tt><hashes len> <leaf =
hash>* <32-bit uint> <32-bit uint>*</tt><br =
class=3D"">| A compact size unsigned integer representing the number of =
leaf<br class=3D"">hashes, followed by a list of leaf hashes, followed =
by the master key<br class=3D"">fingerprint concatenated with the =
derivation path of the public key. The<br class=3D"">derivation path is =
represented as 32-bit little endian unsigned integer<br class=3D"">indexes=
concatenated with each other. Public keys are those needed to<br =
class=3D"">spend this output. The leaf hashes are of the leaves which =
involve this<br class=3D"">public key.<br =
class=3D""></div></div></blockquote><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"">|-<br =
class=3D"">| Taproot Key BIP 32 Derivation Path<br class=3D"">| =
<tt>PSBT_OUT_TAP_BIP32_DERIVATION =3D 0x07</tt><br =
class=3D"">| <tt><xonlypubkey></tt><br class=3D"">| =
The 32 byte X-only public key<br class=3D"">| <tt><hashes =
len> <leaf hash>* <32-bit uint> <32-bit =
uint>*</tt><br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=
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