Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 484B788A for ; Wed, 25 Jan 2017 19:32:39 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-it0-f42.google.com (mail-it0-f42.google.com [209.85.214.42]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 18EF2167 for ; Wed, 25 Jan 2017 19:32:37 +0000 (UTC) Received: by mail-it0-f42.google.com with SMTP id 203so116152647ith.0 for ; Wed, 25 Jan 2017 11:32:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=thinlink-com.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding; bh=D9aA8rlh2TGYP05+8lsTiWoO9Us3GawgRy9ZFpc9m9k=; b=kf2JEPi9N4+68Qn3YatHzRE7mimQCw4a42UV6uzz3NZFSG2WrRJBVqzkvOPVETdpaF oTZ7eQxyj249rqSiJHucXhBry+71e3e07MG9sc8n8FrpKvEn0KhvkcAbHjoZChY9b34z RUdXmoDr3ck2+gpIijvOAIcpN4v6F8femiHjARCiwodKyVVQZDrYnplAhhtrjuRPhq0j EOrhSZSaKrF/SMy9FYhhaXAyvH5g7tC+FAlGm41zg7Qn3C5SoQSLX9URAUOe4Xn2a6Vo +gzhEBL+lR/68TSxzKpZGujuS2DPLVj0D9DnqT2o9E25zjlVCFMc5PGwg01oIeKjrtuW ddKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=D9aA8rlh2TGYP05+8lsTiWoO9Us3GawgRy9ZFpc9m9k=; b=mNPKn8nTjp/+lcG2UeGBZ9aJa9SrpdxgpGo8aA9k6LqMXeVYwmtZNmyVrDD1g0HAj9 MUE9W+wRI8OC1v0dSD0KSXkjB17ZTTNvve3t8aTpAbCwCxBwPFoOGzoJ2NAFvI/Nb29e DJPntCp9Nfavg6ANdtERieu2ok2/C4o29HCDWA94sd7goS+sd3kRA3lTc/TmqZzxkFNg pagY4bRxbmgdc1+2hZr/lalS/H19TySIFwbpDKyzPlraw6wLTnvpVjSOsx9xy935mnH1 p825Hk9l3P20mjV2mlmK8RzdGImTxoQYjp9sdECTQdUu7inAQ2ulvvNjnU6RSLr9tQBZ 7uRg== X-Gm-Message-State: AIkVDXKYupENxI9gVodmhRRiQoXb6hY8+xGjP+UJj5zcOZPDhFvMQrX54k8yg/OMm+wdHHW8 X-Received: by 10.36.6.211 with SMTP id 202mr18405294itv.54.1485372756835; Wed, 25 Jan 2017 11:32:36 -0800 (PST) Received: from [10.199.222.147] ([12.0.205.114]) by smtp.gmail.com with ESMTPSA id y71sm10825439itb.1.2017.01.25.11.32.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 25 Jan 2017 11:32:35 -0800 (PST) To: Johnson Lau , bitcoin-dev References: <3F2FDFFC-A73B-4C0F-A7B2-8449332BE70E@xbt.hk> From: Tom Harding Message-ID: <5276b225-0a90-8539-6024-17b74433cb29@thinlink.com> Date: Wed, 25 Jan 2017 11:32:25 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 MIME-Version: 1.0 In-Reply-To: <3F2FDFFC-A73B-4C0F-A7B2-8449332BE70E@xbt.hk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Thu, 26 Jan 2017 09:32:36 +0000 Subject: Re: [bitcoin-dev] Anti-transaction replay in a hardfork X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jan 2017 19:32:39 -0000 On 1/24/2017 8:03 PM, Johnson Lau wrote: > it seems they are not the same: yours is opt-out, while mine is opt-in. I missed this. So in fact you propose a self-defeating requirement on the new network, which would force unmodified yet otherwise compatible systems to change to support the new network at all. This is unlikely to be included in new network designs. I suggest that the opt-out bits proposal comes from a more realistic position that would actually make sense for everyone.