Return-Path: <gsanders87@gmail.com> Received: from smtp4.osuosl.org (smtp4.osuosl.org [IPv6:2605:bc80:3010::137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 591D1C0012 for <bitcoin-dev@lists.linuxfoundation.org>; Wed, 24 Nov 2021 16:00:55 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 3AD51403CD for <bitcoin-dev@lists.linuxfoundation.org>; Wed, 24 Nov 2021 16:00:55 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -1.848 X-Spam-Level: X-Spam-Status: No, score=-1.848 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, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: smtp4.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S4V-IzUl3IRl for <bitcoin-dev@lists.linuxfoundation.org>; Wed, 24 Nov 2021 16:00:54 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.8.0 Received: from mail-yb1-xb2a.google.com (mail-yb1-xb2a.google.com [IPv6:2607:f8b0:4864:20::b2a]) by smtp4.osuosl.org (Postfix) with ESMTPS id 365A6403C2 for <bitcoin-dev@lists.linuxfoundation.org>; Wed, 24 Nov 2021 16:00:54 +0000 (UTC) Received: by mail-yb1-xb2a.google.com with SMTP id f9so8597615ybq.10 for <bitcoin-dev@lists.linuxfoundation.org>; Wed, 24 Nov 2021 08:00:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=l3xd5l/lKjsPF+YCXdpEMKbRDxTSduOcHeWtjCJsN6s=; b=kqezx0cOn2m9dzZmTyPlCHODmTvCiQ43gV5qUVXLQmuUMSk8494HH4o3CU+zCnAxhq QqBktbmX9jGBSvn+RctvSY7SpSlYNmvwc1Rydbzp+0XsSs6Zoy9cYnnxlt+du2xzDvER rWRNkEFzkBZ7TjCRvcNR2uyLlQpZHAcucXUf+bawIeW2Dkv7ucC6C6kVy9JH8Uf6VRUQ nYqG9tcv+h5FeNMrZSvgLa9WE7DCwRfXefTPRGS0LvQXXVe6PYP9/9e0Y3cNJgyg/dZJ qpBzjLZs787/n68chhcDBIugjTKG2/VZDvnl99vnjotCjKJ4VDH3lry3B7bPpYPXbEJp Kn3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=l3xd5l/lKjsPF+YCXdpEMKbRDxTSduOcHeWtjCJsN6s=; b=jN2/g2J0nBMV054T7P6g0FcM6k5Kkv9MVSUVKr0Z6LmCGAra4rb8OM1eIDInzu1ImN aDWoHgWUKLjXHFeAph49N/1MPzyMKwB+dB5UY4+sBwKqi+Zmyhwy+LbqJaUxCMwbW70w VVIxoHglOqwDAPzG7SD757WI+VrDXtw7EHrIzSuVwE1hRwPL4SpiOl4UV7zGuSYPrNG3 NODzOIaAWBzPKpXV0S5onkXAINRqnELyOxGTilbYUAlCN3/K+gZi+pZU8xZvzC9J/Lb/ UC2X4AgLcK4Ly+EtGXfih7bqf8EgJqUpGUwff3WwqUMHhIrUFh6lH6oCbE1WztCcI3W9 QeGA== X-Gm-Message-State: AOAM531rf8rl1ggw54ss9qL4lPh0hU5WTsNgGOV8iR9ea+LF8FWWBo+v YteDvZ1VBGkt9zxaJq+wKEZfzzFCBvc4ZhyyCws= X-Google-Smtp-Source: ABdhPJzz2N4fS7S55oBDJm8fmQTP3Eo+LCsdSs2FFc8FbV0EP+rfH4GCVEA8hd4Znhnshdlr4zEsP7jCq/vImSAL1Rs= X-Received: by 2002:a25:da4b:: with SMTP id n72mr18912208ybf.496.1637769653169; Wed, 24 Nov 2021 08:00:53 -0800 (PST) MIME-Version: 1.0 References: <795f917b-3883-1827-f39b-35123b500f36@achow101.com> <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> Content-Type: multipart/alternative; boundary="00000000000066b41605d18af6f9" 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 <bitcoin-dev.lists.linuxfoundation.org> List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/bitcoin-dev>, <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=unsubscribe> List-Archive: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/> List-Post: <mailto:bitcoin-dev@lists.linuxfoundation.org> List-Help: <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=help> List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev>, <mailto:bitcoin-dev-request@lists.linuxfoundation.org?subject=subscribe> X-List-Received-Date: Wed, 24 Nov 2021 16:00:55 -0000 --00000000000066b41605d18af6f9 Content-Type: text/plain; charset="UTF-8" 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> --00000000000066b41605d18af6f9--