Return-Path: Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 31E45C002B for ; Tue, 7 Feb 2023 19:04:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 0508561033 for ; Tue, 7 Feb 2023 19:04:08 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org 0508561033 Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=messagingengine.com header.i=@messagingengine.com header.a=rsa-sha256 header.s=fm3 header.b=MXJU/SA8 X-Virus-Scanned: amavisd-new at osuosl.org X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aK4sRVU5Sh96 for ; Tue, 7 Feb 2023 19:04:06 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org C8A8661040 Received: from out2-smtp.messagingengine.com (out2-smtp.messagingengine.com [66.111.4.26]) by smtp3.osuosl.org (Postfix) with ESMTPS id C8A8661040 for ; Tue, 7 Feb 2023 19:04:06 +0000 (UTC) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id E44025C01CE; Tue, 7 Feb 2023 14:04:05 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute1.internal (MEProxy); Tue, 07 Feb 2023 14:04:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:date:date:feedback-id :feedback-id:from:from:in-reply-to:in-reply-to:message-id :mime-version:references:reply-to:sender:subject:subject:to:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm3; t=1675796645; x=1675883045; bh=Opfibo3uqLqgZ5eH7iHQYfMmZNta vHEddkhSUu/Fe3E=; b=MXJU/SA8GuxRoJdVUBZnm1orS/DrSOAXkeR209MPZJ8P L0QZ4+Fa3Gts5ES2oeV96bMugdcAj4eOoVEb9ZyKdalCw7u1f1S7wcgWiFkLzzn0 +IQMay0txJYkHDzWXlVFEsp4I4D64bwu2pJrdZ1/I3B9nSadqkb2neVxvOsAlVbN XXdOcoL2YaToZTHfAVrWXH/VO3CevXGaPyY5ZR5/5Evmsq7JjBzGAuGuy25ywIfa w1uzctoxOGkBhHQZbI3gki4JDWf75qvQpyXwIJKR32JB3ZzEMtTcQrTC8CLrm5fm soL+vBTK1cezVKOL8etw0SMmQLpPGnXsaaRvM9M7yA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrudegkedguddujecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd enucfjughrpeffhffvvefukfhfgggtuggjsehgtderredttddvnecuhfhrohhmpefrvght vghrucfvohguugcuoehpvghtvgesphgvthgvrhhtohguugdrohhrgheqnecuggftrfgrth htvghrnhepledvleelffdtudekudffjefgfeejueehieelfedtgfetudetgeegveeutefh jedtnecuffhomhgrihhnpehpvghtvghrthhouggurdhorhhgnecuvehluhhsthgvrhfuih iivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepphgvthgvsehpvghtvghrthhouggu rdhorhhg X-ME-Proxy: Feedback-ID: i525146e8:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 7 Feb 2023 14:04:04 -0500 (EST) Received: by localhost (Postfix, from userid 1000) id BCF775F824; Tue, 7 Feb 2023 14:04:00 -0500 (EST) Date: Tue, 7 Feb 2023 14:04:00 -0500 From: Peter Todd To: Russell O'Connor , Bitcoin Protocol Discussion Message-ID: References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="efovbRgJqQEYHyKc" Content-Disposition: inline In-Reply-To: Subject: Re: [bitcoin-dev] Unenforceable fee obligations in multiparty protocols with Taproot inputs 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: Tue, 07 Feb 2023 19:04:08 -0000 --efovbRgJqQEYHyKc Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Feb 07, 2023 at 01:35:12PM -0500, Russell O'Connor via bitcoin-dev = wrote: > There is a bug in Taproot that allows the same Tapleaf to be repeated > multiple times in the same Taproot, potentially at different Taplevels > incurring different Tapfee rates. >=20 > The countermeasure is that you should always know the entire Taptree when > interacting with someone's Tapspend. Another countermeasure could be to implement RBF on taproot witnesses, allo= wing transactions with deeper, less efficient, tapleaf scripts to be replaced wi= th shallower, more efficient, tapleafs. If implemented by giving your peer some kind of delta encoded update, the bandwidth efficiency may be sufficient to always allow such updates. --=20 https://petertodd.org 'peter'[:-1]@petertodd.org --efovbRgJqQEYHyKc Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE0RcYcKRzsEwFZ3N5Lly11TVRLzcFAmPioJ0ACgkQLly11TVR LzciBg//c7gaOFcXL8gHZbPs9kyqfa661M4vTd92h4Zciq7przlZzkv7A7+euhTW RFAHDWYC5QtngelVf7VaasVtm3qIpO5GUuOBw+oKMk/1ncxXw7dJv1TlLff5xy5d wwxMrfCTR3t4S/22hx95IUL+kiuO41p3BhXgQax3IbGs4wwZEd9jLmt0Lp43OKYF izdpM3NeQiOqeG9GgKQsgX6GBYDZ8H+fJ8aTxmAX95zs3w8esuDR8+XntB/r6SJs oYaeNYVUCoVdCA4eY6YNJ6wm56YRD45yv3a9qd7KbkzAdCm/aExKVBnvdSvJruxJ hOGhKtSYphmpBa1NQlNKa2GqrACO0K8/xNuEA7BjGElqrn9ed9hEy55iNBah80z/ Ocub/Wkts+5ZdAwLjRTXCL6fZKK+kO37MwnB2k6SNk0JnEzswyXo9Kir0PCXKuia VyswIPvX/F5xt5E7ccQjKFPJdKQNfPt/mvMqhoDhCJmHvJUomoWpycmGhqQLH1bq MEtquSZIKwJgVcmMiN4efYvPTOmqCUOiiRiehCGGYSp39beyf3p2eFXv8PeySy1k TSmRKakJJCv3CA/ZxwJEjWzYmXU3lpnaYURyGw/Frenn96Jt/rKlwN8TMLSGTUtX TzxAxgyL59ndTYtT9/nUf+k2USs59SOCbQAA4cEUP4xe47ZoajI= =NPjl -----END PGP SIGNATURE----- --efovbRgJqQEYHyKc--