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[54.240.14.43]) by gmr-mx.google.com with ESMTPS id d9443c01a7336-2ddb75418efsi380045ad.5.2026.09.18.03.38.49 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Sep 2026 03:38:49 -0700 (PDT) Received-SPF: pass (google.com: domain of 010001a0b418f0f2-92c7e013-aea0-4707-ab25-06beafce173a-000000@send.cipherscope.io designates 54.240.14.43 as permitted sender) client-ip=54.240.14.43; In-Reply-To: <010001a06dd4cdd9-b8082042-8750-4e9a-917e-2053c919e4c4-000000@email.amazonses.com> References: <010001a06dd4cdd9-b8082042-8750-4e9a-917e-2053c919e4c4-000000@email.amazonses.com> From: "'duncan0k' via Bitcoin Development Mailing List" To: bitcoindev@googlegroups.com Subject: Re: [bitcoindev] Standardizing public key exposure classification for existing outputs Message-ID: <010001a0b418f0f2-92c7e013-aea0-4707-ab25-06beafce173a-000000@email.amazonses.com> Date: Fri, 18 Sep 2026 10:38:48 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Feedback-ID: :1.us-east-1.uYze2bwK3SHKKircWy/itkS3vRiPQKZLrl6+y7WCGuRPsvW9ql8MorhNCUOEXf2PGCXNSg8zb4wXghGsSzasI0jj39JRaHKfNZGZIx1mhBBywFYJj0UYJyJnxeFR8KB0PocMWVVGOZzOXWt7Tivy/pn7sTtrfNSfjeDxZfpLwxQ=:1.us-east-1.QSNtDRXSTq9sAuvRl56h5mypgasnQ5yDLNpVzTnziu0=:AmazonSES X-SES-Outgoing: 2026.09.18-54.240.14.43 X-Original-Sender: duncan0k@cipherscope.io X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@cipherscope.io header.s=resend header.b="Di6r3Z/f"; dkim=pass header.i=@amazonses.com header.s=224i4yxa5dv7c2xz3womw6peuasteono header.b=f8QzN6Xm; spf=pass (google.com: domain of 010001a0b418f0f2-92c7e013-aea0-4707-ab25-06beafce173a-000000@send.cipherscope.io designates 54.240.14.43 as permitted sender) smtp.mailfrom=010001a0b418f0f2-92c7e013-aea0-4707-ab25-06beafce173a-000000@send.cipherscope.io; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=cipherscope.io X-Original-From: duncan0k Reply-To: duncan0k 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 (-) The draft is now at v0.5.1 and submitted to the BIPs repository as an Informational BIP: https://github.com/bitcoin/bips/pull/2294 Two things changed since the v0.4.0 note, both after murch's review on Delving: - The first two levels are now stated as BIP 360's long exposure and short exposure vulnerabilities, per output, and the draft cites that section as the source of the taxonomy. - P2MR was wrong. My original post said a spend publishes key material for every type except P2MR. That is false: a leaf spend puts the leaf script, its Merkle path and a secp256k1 key in the mempool, the same race as P2WSH. P2MR is EXPOSED_ON_SPEND until post-quantum leaves exist, and NOT_EXPOSED has no member today. Draft, reference implementation and 25 vectors: https://github.com/duncan0k/pubkey-exposure-classification Publication of an Informational BIP depends on feedback on the PR, so if you have a view either way, that is where it counts. duncan0k -- 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 email to bitcoindev+unsubscribe@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/bitcoindev/010001a0b418f0f2-92c7e013-aea0-4707-ab25-06beafce173a-000000%40email.amazonses.com.