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[103.168.172.148]) by gmr-mx.google.com with ESMTPS id d2e1a72fcca58-70cff6ed25asi14099b3a.3.2024.07.18.18.05.38 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jul 2024 18:05:38 -0700 (PDT) Received-SPF: pass (google.com: domain of pete@petertodd.org designates 103.168.172.148 as permitted sender) client-ip=103.168.172.148; Received: from compute2.internal (compute2.nyi.internal [10.202.2.46]) by mailfout.nyi.internal (Postfix) with ESMTP id CDFD7138016E; Thu, 18 Jul 2024 21:05:37 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute2.internal (MEProxy); Thu, 18 Jul 2024 21:05:37 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeftddrhedtgdegfecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpeffhffvvefukfhfgggtuggjsehgtderredttddvnecuhfhrohhmpefrvghtvghr ucfvohguugcuoehpvghtvgesphgvthgvrhhtohguugdrohhrgheqnecuggftrfgrthhtvg hrnhepledvleelffdtudekudffjefgfeejueehieelfedtgfetudetgeegveeutefhjedt necuffhomhgrihhnpehpvghtvghrthhouggurdhorhhgnecuvehluhhsthgvrhfuihiivg eptdenucfrrghrrghmpehmrghilhhfrhhomhepphgvthgvsehpvghtvghrthhouggurdho rhhg X-ME-Proxy: Feedback-ID: i525146e8:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 18 Jul 2024 21:05:36 -0400 (EDT) Received: by localhost (Postfix, from userid 1000) id 13ACB5F83F; Fri, 19 Jul 2024 01:05:33 +0000 (UTC) Date: Fri, 19 Jul 2024 01:05:33 +0000 From: Peter Todd To: Antoine Riard Cc: Bitcoin Development Mailing List Subject: Re: [bitcoindev] Re: A "Free" Relay Attack Taking Advantage of The Lack of Full-RBF In Core Message-ID: References: <18fc443d-c347-4a84-94fe-81308ae20b76n@googlegroups.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="4SzzqDMzgZ8dve2g" Content-Disposition: inline In-Reply-To: <18fc443d-c347-4a84-94fe-81308ae20b76n@googlegroups.com> X-Original-Sender: pete@petertodd.org X-Original-Authentication-Results: gmr-mx.google.com; dkim=pass header.i=@messagingengine.com header.s=fm2 header.b=wEkjHzh4; spf=pass (google.com: domain of pete@petertodd.org designates 103.168.172.148 as permitted sender) smtp.mailfrom=pete@petertodd.org 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: -0.8 (/) --4SzzqDMzgZ8dve2g Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline On Thu, Jul 18, 2024 at 04:04:47PM -0700, Antoine Riard wrote: > Hi Peter, > > In my understanding, the attack efficiency varies widely in function of the > hashrate ressources > of the miner getting the high-feerate double-spend A2 transaction. I think > higher are the hashrate > ressources, lower would have been the transaction B (re)-broadcast > bandwidth waste. I think you need to re-read the attack carefully before we discuss this further. The % of hash power mining full-rbf does not significantly change the cost efficiency of the attack as long as the fee-rate of the B transaction(s) is below the minimum economic fee-rate necessary for miners to mine a transaction. Above the minimum economic fee-rate, the cost efficiency is an essentially linear function of % of full-rbf miners. -- https://petertodd.org 'peter'[:-1]@petertodd.org -- 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 on the web visit https://groups.google.com/d/msgid/bitcoindev/Zpm73WHBNIkkIT0Y%40petertodd.org. --4SzzqDMzgZ8dve2g Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE0RcYcKRzsEwFZ3N5Lly11TVRLzcFAmaZu9AACgkQLly11TVR LzdgGBAAuXsRgk1khachjU43JtdMxtHAk6xjdaR+qX+0jcOdhLnu2Z+TluwKuEBc 3zH54IwYZNNWibrc8Ncfa0TKUjH38biJm5v21XUGIjX/pXR8ehO9Sb2vJpbLUIM8 e45eYWIn3h8nNeIjZ4xbF8pq2fbANtiWWxlIUU1G8qoMDZUrnswo/1zOj8/SqMa8 94j/WGjlj94BYbAiMbLlbcNr6qtycB/FTKoXkiEd68mjftgBkRV5qFVuNaG0XBYE MdsFVsA7ChYGH51m0YZUJ0hcPmD4VPqXyuYfIXggI6P0NztiSDDP6tltcuriw2UT nyHP9S0Ke3A0MXqSYJeX6yLhVuLNP/oI7ZRK5ISWD9qR9WCcF7B4PUoMaPtZi78T FqHL4S77BPHcV2GcOunlW/M0qL7IT6eFtEXKuqV1Vd9X1ccr5w06TevwcWOgdXJz 3/T0ibXrJpyxidYgh/podvMQxFMTnG5rGl29i4xq0p8f6nJTI4/XSW7vFhgEXKNB lCszdIEzAFujFpPrjiOwMSoDBvoFM4UfgabHQXWhxo15V60nL1tFkHXE6ct5OLou 6pse/0l7V/mAMlrpYOmvXyF0p6oawwYq4cI9ANEDnVsXavOtqGd0Cyu8t7hi8sI3 x3dhV0n8o5qcwSVRXvgjrKcFVNCyNKDlUte6FHfGIz2oR73BvfU= =ZXNG -----END PGP SIGNATURE----- --4SzzqDMzgZ8dve2g--