From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1VdIsu-0002XF-CZ for bitcoin-development@lists.sourceforge.net; Mon, 04 Nov 2013 12:03:56 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.214.178 as permitted sender) client-ip=209.85.214.178; envelope-from=mh.in.england@gmail.com; helo=mail-ob0-f178.google.com; Received: from mail-ob0-f178.google.com ([209.85.214.178]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1VdIst-0006NB-MW for bitcoin-development@lists.sourceforge.net; Mon, 04 Nov 2013 12:03:56 +0000 Received: by mail-ob0-f178.google.com with SMTP id wm4so6885507obc.23 for ; Mon, 04 Nov 2013 04:03:50 -0800 (PST) MIME-Version: 1.0 X-Received: by 10.60.42.203 with SMTP id q11mr861603oel.54.1383566630305; Mon, 04 Nov 2013 04:03:50 -0800 (PST) Sender: mh.in.england@gmail.com Received: by 10.76.156.42 with HTTP; Mon, 4 Nov 2013 04:03:50 -0800 (PST) In-Reply-To: <52778BCE.8030904@ceptacle.com> References: <52778BCE.8030904@ceptacle.com> Date: Mon, 4 Nov 2013 13:03:50 +0100 X-Google-Sender-Auth: LwesrqqpQuoV6vUh2yZiLPJZsV0 Message-ID: From: Mike Hearn To: Michael Gronager Content-Type: multipart/alternative; boundary=001a11c207f085c5eb04ea58b573 X-Spam-Score: -0.5 (/) 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 (mh.in.england[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 1.0 HTML_MESSAGE BODY: HTML included in message 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 X-Headers-End: 1VdIst-0006NB-MW Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Auto-generated miner backbone X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Nov 2013 12:03:56 -0000 --001a11c207f085c5eb04ea58b573 Content-Type: text/plain; charset=UTF-8 > > The suggested change is actually very simple (minutes of coding) and > elegant and addresses precisely the identified problem. > Disagree. Unless I'm misunderstanding what they propose, their suggested change would mean anyone could broadcast a newly discovered block at any point and have a 50% chance of being the winner. That is a fundamental change to the dynamics of how Bitcoin works that would require careful thought and study. Also, their solution doesn't really address the problem they bring up, it just changes the size of the threshold required. Fundamentally, their attack is a sybil attack. It doesn't work if they can't delay or block a pools competitors because mostly their block will come in second place and they'll lose the race. Thus the solution should be a solution to sybil attacks. --001a11c207f085c5eb04ea58b573 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
The suggested change is actually very simple (minutes of coding) and<= /span>
elegant and addresses precisely the identified problem.

Disagree. Unless I'm misunderstanding what they propo= se, their suggested change would mean anyone could broadcast a newly discov= ered block at any point and have a 50% chance of being the winner. That is = a fundamental change to the dynamics of how Bitcoin works that would requir= e careful thought and study.

Also, their solution doesn't really address the pro= blem they bring up, it just changes the size of the threshold required.=C2= =A0

Fundamentally, their attack is a sybil attack.= It doesn't work if they can't delay or block a pools competitors b= ecause mostly their block will come in second place and they'll lose th= e race. Thus the solution should be a solution to sybil attacks.
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