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[109.224.244.26]) by gmr-mx.google.com with ESMTPS id ada2fe7eead31-78a47ab79c5si518526137.3.2026.09.09.11.19.24 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2026 11:19:24 -0700 (PDT) Received-SPF: pass (google.com: domain of 2099999997690000@proton.me designates 109.224.244.26 as permitted sender) client-ip=109.224.244.26; Date: Wed, 09 Sep 2026 18:19:18 +0000 To: "bitcoindev@googlegroups.com" From: "'2099999997690000' via Bitcoin Development Mailing List" Subject: [bitcoindev] bitcoindev@googlegroups.com Message-ID: Feedback-ID: 170389540:user:proton X-Pm-Message-ID: f2e7a7b30d71bfd350e9904baefb29c11cdf8384 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="b1=_HuDmYjZpvkDXrvTnvM3P626yLJu1JJB9qqVZZNQN0" X-Original-Sender: 2099999997690000@proton.me X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@proton.me header.s=cjpbrefv4bdxthgzzlcrpdyuom.protonmail header.b=nQRPAddV; spf=pass (google.com: domain of 2099999997690000@proton.me designates 109.224.244.26 as permitted sender) smtp.mailfrom=2099999997690000@proton.me; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=proton.me X-Original-From: 2099999997690000 <2099999997690000@proton.me> Reply-To: 2099999997690000 <2099999997690000@proton.me> Precedence: list Mailing-list: list bitcoindev@googlegroups.com; contact bitcoindev+owners@googlegroups.com List-ID: X-Google-Group-Id: 786775582512 List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , X-Spam-Score: -1.0 (-) --b1=_HuDmYjZpvkDXrvTnvM3P626yLJu1JJB9qqVZZNQN0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi all, Pursuant to the discussions about standardizing an unspendable NUMS key for= an script path only taproot policy https://delvingbitcoin.org/t/unspendabl= e-keys-in-descriptors/304 and https://github.com/bitcoin/bips/pull/1746 ; w= e undertook the issue with these guiding principles: - We don't police adherence to other bips except when they directly affect = the issue at hand. - We use the already in place mechanisms in other bips. - We don't claim semantic canonicalization of the script and only normalize= the policy to some opinionated extent. The gist is, we define _=E2=80=8B as a placeholder for the unspendable NUMS= key. We sort keys inside musig(...) and sortedmulti_a. We sort sibling pai= rs of the tree. If there is multipath extension, we add the same length tup= le to the _=E2=80=8B so that we don't fall to reuse. Then we pull the keys = out and us @i=E2=80=8B placeholders and hash the whole thing consisting of = the normalized descriptor and the keys. That would be the chain code for th= e H=E2=80=8B defined in BIP 341. The details can be found here: https://github.com/bitryonix/bips/blob/bip-xxxx-unspendable-internal-keys/b= ip-xxxx-unspendable-internal-keys.mediawiki Best, NTL - --=20 You received this message because you are subscribed to the Google Groups "= Bitcoin Development Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an e= mail to bitcoindev+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/= Sk4mSfbFO2smtuHSMyjmpjCrCIhHvnG7cajKVg6H6fx-H1MuS6gDxJxVyAiBXeg3IoSWgNevsE-= xB41H0BsUHNcgUh-walxHAmA2vKIT-dE%3D%40proton.me. --b1=_HuDmYjZpvkDXrvTnvM3P626yLJu1JJB9qqVZZNQN0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi all,

Pursuant t= o the discussions about standardizing an unspendable NUMS key for an script= path only taproot policy https://delvingbitcoin.org/t/unspendable-keys-i= n-descriptors/304 and https://github.com/bitcoin/bips/pull/1746 ; we unde= rtook the issue with these guiding principles:

  1. We don't police adherence to o= ther bips except when they directly affect the issue at hand.
    2. We use the already in p= lace mechanisms in other bips.
  2. We don't claim semantic canonicalization of the script= and only normalize the policy to some opinionated extent.

The gist is, we = define _=E2=80=8B as a placeholder for the unspendable NUMS ke= y. We sort keys inside musig(...) and sortedmulti_a. We sort sibling pairs = of the tree. If there is multipath extension, we add the same length tuple = to the _=E2=80=8B so that we don't fall to reuse. Then we pull= the keys out and us @i=E2=80=8B placeholders and hash the who= le thing consisting of the normalized descriptor and the keys. That would b= e the chain code for the H=E2=80=8B defined in BIP 341.
<= div>
The details can be found here:

Best,
NTL

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