Return-Path: Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8ED35C0012 for ; Wed, 24 Nov 2021 12:50:56 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 7DF5B81A64 for ; Wed, 24 Nov 2021 12:50:56 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -1.552 X-Spam-Level: X-Spam-Status: No, score=-1.552 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_ABUSE_SURBL=1.25] autolearn=no autolearn_force=no Authentication-Results: smtp1.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=sprovoost.nl header.b="w0bFaKsk"; dkim=pass (2048-bit key) header.d=messagingengine.com header.b="lZNR30mP" Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BH0fMsANqpHg for ; Wed, 24 Nov 2021 12:50:55 +0000 (UTC) X-Greylist: delayed 00:06:06 by SQLgrey-1.8.0 Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by smtp1.osuosl.org (Postfix) with ESMTPS id 6EBB881A5F for ; Wed, 24 Nov 2021 12:50:55 +0000 (UTC) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.west.internal (Postfix) with ESMTP id A230C3200953; Wed, 24 Nov 2021 07:44:48 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Wed, 24 Nov 2021 07:44:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sprovoost.nl; h= from:content-type:mime-version:subject:date:references:to :in-reply-to:message-id; s=fm1; bh=XM9iM/MFFcsE2J3dahnIpmQ3S9Me9 paEfOyG4o4QXSU=; b=w0bFaKskeeNG4ymuCZatY1O9gcAR4M2fyp48zgYc5l8ZC v7ttc2sy0Zy92ZQ/3HQ65cZ3YUMVg0XZ4fMkVayTGWJMu9iHF/URIwE1+BhpUp7E 5ZtgITiSSy1dQ0l+kTSoed4dWAegYnFzY6SCYo0dFmrlzCPG3AXyELpDLUUnqNV4 yfTIgKkAjnxKkKaOe5kQ+0ZZ57BsJBFiDVvs5Kytc6aYiBt8CBI3NQxVrcGX1Cfj aiFWSxEReSjvvGVyA9k+95fyysjeC97+MOzN22qxK8v2kwm9ryTS5YzkZCiTN9iG 26ZikaV+zSYj9mIJZQ/NXh84LijuGwIQsP1AWeS0A== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=XM9iM/ MFFcsE2J3dahnIpmQ3S9Me9paEfOyG4o4QXSU=; b=lZNR30mPxsF3OL70eqnlIQ QlAk7Yyx1mzgfhJoRdbs0Rt9R5mkI9VUk1ziV+1fRfOMmSAi0JX0QztljctZffsk imQTnWtXm6iqZyqN6mst36imr7ThFskdpRZspVNtnQuqLY7YRX28tNi8gurnXoYN CKs0GrEbfNpwCtMD5xNq3rDHn5AIKFmfTNedSgIyzLHH8/NBaiIu3PZ2UtWR3Vh5 0I+FRzwzdzbUgBgg+Qbj3ldmEO7Y/h+DLdEoXG0jrFJwHIqkHdiLJtoHv9nS1clm ATQXz9dGugz+/01DFjR+/tLXpGZjWlCG/TTNxJrOg48+41mzz7PfYLvjDVN5YoUA == X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvuddrgeekgdeghecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhtggguffffhfvjgfkofesghdtmherhhdtvdenucfhrhhomhepufhjohhrshcu rfhrohhvohhoshhtuceoshhjohhrshesshhprhhovhhoohhsthdrnhhlqeenucggtffrrg htthgvrhhnpeevvdfgjeetueetkeegjeetueeljeegieevhfelkeffffdvjeeuteevvedu hfffkeenucffohhmrghinhepghhithhhuhgsrdgtohhmnecuvehluhhsthgvrhfuihiivg eptdenucfrrghrrghmpehmrghilhhfrhhomhepshhjohhrshesshhprhhovhhoohhsthdr nhhl X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 24 Nov 2021 07:44:47 -0500 (EST) From: Sjors Provoost Content-Type: multipart/signed; boundary="Apple-Mail=_92A76D1B-DFD9-4E4C-94D5-EDD1B26C41D5"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 15.0 \(3693.20.0.1.32\)) Date: Wed, 24 Nov 2021 13:44:46 +0100 References: <795f917b-3883-1827-f39b-35123b500f36@achow101.com> To: Andrew Chow , Bitcoin Dev In-Reply-To: <795f917b-3883-1827-f39b-35123b500f36@achow101.com> Message-Id: X-Mailer: Apple Mail (2.3693.20.0.1.32) X-Mailman-Approved-At: Wed, 24 Nov 2021 15:15:44 +0000 Subject: Re: [bitcoin-dev] Taproot Fields for PSBT X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Nov 2021 12:50:56 -0000 --Apple-Mail=_92A76D1B-DFD9-4E4C-94D5-EDD1B26C41D5 Content-Type: multipart/alternative; boundary="Apple-Mail=_0AB63C07-24DA-4227-92FC-4C04F2F8F6C7" --Apple-Mail=_0AB63C07-24DA-4227-92FC-4C04F2F8F6C7 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii 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 = 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 = > - > | Taproot Key BIP 32 Derivation Path > | PSBT_IN_TAP_BIP32_DERIVATION =3D 0x16 > | > | The 32 byte X-only public key > | * <32-bit uint> <32-bit uint>* > | 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 > | PSBT_OUT_TAP_BIP32_DERIVATION =3D 0x07 > | > | The 32 byte X-only public key > | * <32-bit uint> <32-bit uint>* >=20 --Apple-Mail=_0AB63C07-24DA-4227-92FC-4C04F2F8F6C7 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii 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


-
| 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>


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