From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1X31f9-0002BC-FC for bitcoin-development@lists.sourceforge.net; Fri, 04 Jul 2014 11:28:19 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gmail.com designates 209.85.212.180 as permitted sender) client-ip=209.85.212.180; envelope-from=andyparkins@gmail.com; helo=mail-wi0-f180.google.com; Received: from mail-wi0-f180.google.com ([209.85.212.180]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1X31f7-0000Tq-JB for bitcoin-development@lists.sourceforge.net; Fri, 04 Jul 2014 11:28:19 +0000 Received: by mail-wi0-f180.google.com with SMTP id hi2so3778552wib.7 for ; Fri, 04 Jul 2014 04:28:11 -0700 (PDT) X-Received: by 10.194.177.168 with SMTP id cr8mr2103416wjc.134.1404473290474; Fri, 04 Jul 2014 04:28:10 -0700 (PDT) Received: from momentum.localnet ([91.84.15.31]) by mx.google.com with ESMTPSA id l5sm78195732wif.22.2014.07.04.04.28.09 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Jul 2014 04:28:09 -0700 (PDT) From: Andy Parkins To: Alan Reiner Date: Fri, 04 Jul 2014 12:28:08 +0100 Message-ID: <2403605.jQQrFQc91a@momentum> User-Agent: KMail/4.12.4 (Linux/3.10-2-amd64; KDE/4.13.1; x86_64; ; ) In-Reply-To: <53B68E6B.6090602@gmail.com> References: <10566815.3CllqoMfON@momentum> <2734024.vxftdBi7Ll@momentum> <53B68E6B.6090602@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Spam-Score: -1.6 (-) 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 (andyparkins[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 X-Headers-End: 1X31f7-0000Tq-JB Cc: bitcoin-development@lists.sourceforge.net Subject: Re: [Bitcoin-development] ASIC-proof mining 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: Fri, 04 Jul 2014 11:28:19 -0000 On Friday 04 July 2014 07:22:19 Alan Reiner wrote: > I think you misundersood.... using ROMix-like algorithm, each hash I did. Sorry. > requires a different 32 MB of the blockchain. Uniformly distributed > throughout the blockchain, and no way to predict which 32 MB until you > have actually executed it. If the difficulty is high enough, your > miner is likely to end up going through the entire X GB blockchain while > searching for a good hash, but other nodes will only need to do 32 MB > worth of disk accesses to verify your answer (and it will be unknown > which 32 MB until they do the 1,000,000 hash+lookup operations on their > X GB blockchain). Excellent. Andy -- Dr Andy Parkins andyparkins@gmail.com