From: Sjors Provoost <sjors@sprovoost•nl>
To: Andrew Chow <achow101-lists@achow101•com>,
Bitcoin Dev <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] Taproot Fields for PSBT
Date: Wed, 24 Nov 2021 13:44:46 +0100 [thread overview]
Message-ID: <E2219CF0-4044-42BC-B782-69DCFF33A5A0@sprovoost.nl> (raw)
In-Reply-To: <795f917b-3883-1827-f39b-35123b500f36@achow101.com>
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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:
>
> 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 <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>
>
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next prev parent reply other threads:[~2021-11-24 12:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 21:22 Andrew Chow
2021-06-28 10:03 ` Salvatore Ingala
2021-06-28 16:04 ` Andrew Chow
2021-06-28 19:56 ` Salvatore Ingala
2021-07-08 20:06 ` Jeremy
2021-11-24 12:44 ` Sjors Provoost [this message]
2021-11-24 16:00 ` Greg Sanders
2021-11-24 16:08 ` Pieter Wuille
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