Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from <gavinandresen@gmail.com>) id 1S2sIY-00064J-GD for bitcoin-development@lists.sourceforge.net; Wed, 29 Feb 2012 22:47:02 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.212.175 as permitted sender) client-ip=209.85.212.175; envelope-from=gavinandresen@gmail.com; helo=mail-wi0-f175.google.com; Received: from mail-wi0-f175.google.com ([209.85.212.175]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1S2sIX-0005m1-N5 for bitcoin-development@lists.sourceforge.net; Wed, 29 Feb 2012 22:47:02 +0000 Received: by wibhq12 with SMTP id hq12so2733486wib.34 for <bitcoin-development@lists.sourceforge.net>; Wed, 29 Feb 2012 14:46:55 -0800 (PST) Received-SPF: pass (google.com: domain of gavinandresen@gmail.com designates 10.216.82.141 as permitted sender) client-ip=10.216.82.141; Authentication-Results: mr.google.com; spf=pass (google.com: domain of gavinandresen@gmail.com designates 10.216.82.141 as permitted sender) smtp.mail=gavinandresen@gmail.com; dkim=pass header.i=gavinandresen@gmail.com Received: from mr.google.com ([10.216.82.141]) by 10.216.82.141 with SMTP id o13mr1261645wee.2.1330555615592 (num_hops = 1); Wed, 29 Feb 2012 14:46:55 -0800 (PST) MIME-Version: 1.0 Received: by 10.216.82.141 with SMTP id o13mr1018517wee.2.1330555615521; Wed, 29 Feb 2012 14:46:55 -0800 (PST) Received: by 10.223.121.197 with HTTP; Wed, 29 Feb 2012 14:46:55 -0800 (PST) In-Reply-To: <CAPBPUnqgV_hHYwFoB_1qXMvEaE1pM0vm8=V=AKe2n-rPFzz+mQ@mail.gmail.com> References: <CAPg+sBhb+gYMwp1OJuCHYt5=BU63=YBWOFaLLthHBkN_U-scaA@mail.gmail.com> <CAPBPUnqgV_hHYwFoB_1qXMvEaE1pM0vm8=V=AKe2n-rPFzz+mQ@mail.gmail.com> Date: Wed, 29 Feb 2012 17:46:55 -0500 Message-ID: <CABsx9T1YbFLcuCLbZZvSJGPy9k0PRgWttOp-KPUW+99XSYTkQQ@mail.gmail.com> From: Gavin Andresen <gavinandresen@gmail.com> To: Ben Reeves <support@pi.uk.com> Content-Type: text/plain; charset=ISO-8859-1 X-Spam-Score: -1.4 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (gavinandresen[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.2 AWL AWL: From: address is in the auto white-list X-Headers-End: 1S2sIX-0005m1-N5 Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net> Subject: Re: [Bitcoin-development] Duplicate transactions vulnerability X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: <bitcoin-development.lists.sourceforge.net> List-Unsubscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, <mailto:bitcoin-development-request@lists.sourceforge.net?subject=unsubscribe> List-Archive: <http://sourceforge.net/mailarchive/forum.php?forum_name=bitcoin-development> List-Post: <mailto:bitcoin-development@lists.sourceforge.net> List-Help: <mailto:bitcoin-development-request@lists.sourceforge.net?subject=help> List-Subscribe: <https://lists.sourceforge.net/lists/listinfo/bitcoin-development>, <mailto:bitcoin-development-request@lists.sourceforge.net?subject=subscribe> X-List-Received-Date: Wed, 29 Feb 2012 22:47:02 -0000 On Wed, Feb 29, 2012 at 5:05 PM, Ben Reeves <support@pi.uk.com> wrote: > A malicious miner can produce a duplicate coinbase which the majority > of clients will accept but the majority of hashing power won't. > Spending the coinbase output after.... That can't happen until the coinbase matures, which takes 100 blocks. And it won't mature because a majority of hashing power is rejecting it, right? -- -- Gavin Andresen