Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-4.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1SnBia-0003hC-BI for bitcoin-development@lists.sourceforge.net; Fri, 06 Jul 2012 16:49:20 +0000 X-ACL-Warn: Received: from mail-lb0-f175.google.com ([209.85.217.175]) by sog-mx-3.v43.ch3.sourceforge.com with esmtps (TLSv1:RC4-SHA:128) (Exim 4.76) id 1SnBiY-00089F-VX for bitcoin-development@lists.sourceforge.net; Fri, 06 Jul 2012 16:49:20 +0000 Received: by lbol5 with SMTP id l5so14542405lbo.34 for ; Fri, 06 Jul 2012 09:49:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:x-originating-ip:in-reply-to:references:date :message-id:subject:from:to:cc:content-type:x-gm-message-state; bh=I+dY34Xnnqp+wzI4S9dCcXAHBX020jsSzBi/cTSKeDg=; b=clqRbn07efNxh/X48kp+e2P5wJJhxtqeVuU7rYSOZG5Ee5P/tL1e8WhZLVqIBH83w1 xYrprP1kj4zvGBVfWazNk0mpASCzNswJV7JJsyoTi20oJd1JPHGJ6W6COEKN7Nzg5X6G Kym//YiKTOwdUaf9zS3oGef3dYudh+zrAHfgWjLmUn82ISknTpzSyKrfZYfADMViovve xJ0TvOXxSpnW6mQp0Qt1BXYzOCTGcwPx8xJOCOWLsc0tvYHv3i4ZC3gOEKudV+vEpMoX ubrGCFGigcHVTctDJqTO47NzN54j7x5Vav+y8cdcwjZQWgRjATXd7fAdiPUTXsyJOML8 Ioyw== MIME-Version: 1.0 Received: by 10.152.131.68 with SMTP id ok4mr30589076lab.47.1341593352415; Fri, 06 Jul 2012 09:49:12 -0700 (PDT) Received: by 10.114.63.165 with HTTP; Fri, 6 Jul 2012 09:49:12 -0700 (PDT) X-Originating-IP: [2001:4830:1603:2:21c:c0ff:fe79:c8c2] In-Reply-To: References: Date: Fri, 6 Jul 2012 12:49:12 -0400 Message-ID: From: Jeff Garzik To: Peter Vessenes Content-Type: text/plain; charset=ISO-8859-1 X-Gm-Message-State: ALoCoQmxMAMNrLVJoUfDjVlPM56nFAvvFhwMVrXb6TTSqrQshwk8Tla5qV+/+4GYI6r7CvHGIoaP X-Spam-Score: 0.0 (/) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. X-Headers-End: 1SnBiY-00089F-VX Cc: Bitcoin Development Subject: Re: [Bitcoin-development] BIP 34: Block v2, Height in Coinbase 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, 06 Jul 2012 16:49:20 -0000 On Fri, Jul 6, 2012 at 12:45 PM, Peter Vessenes wrote: > The proposal is simple, and it's a small change for miners, I imagine. > > My question is: why? > > I worry about stuffing too many requirements on the coinbase. I suppose > the coinbase is easily extendible if we run out of bytes, but I think I'd > like to see some more discussion / good / bad type cases for making this > change. What do we get over just the prev_hash by doing this? With the existing setup (sans height in coinbase), you might not have unique transactions, with all that entails. > Anyway, some background would be great; if I missed it, I'm happy to go > read up, but I didn't see any links on the wiki. Gavin wrote some notes on upgrades and BIP16 lessons-learned at https://gist.github.com/2355445 -- Jeff Garzik exMULTI, Inc. jgarzik@exmulti.com