Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 1D282B4C for ; Sun, 5 Jul 2015 15:00:38 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-pd0-f175.google.com (mail-pd0-f175.google.com [209.85.192.175]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id C6E3132 for ; Sun, 5 Jul 2015 15:00:37 +0000 (UTC) Received: by pdbci14 with SMTP id ci14so90729149pdb.2 for ; Sun, 05 Jul 2015 08:00:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:content-type:content-transfer-encoding; bh=hdVhWos20cwHGGfsRT8CNSLDlYjdKPQtOAWK5Z7cEKM=; b=H8Ctq0IPlPzZAoETGtpzgUDs/LZmCAcUBTqoN+4bqpXgWygtfGGPNSvaUbj2RKHBeC 65SgYDVh+CU2Jf9Zq4aUkvZHXA/VgvI28Nurv1d8nF73QwmcbIiINyAiULoCsc4q9Kv5 +VLImo7KBICrH8johZA85NiEOiOTm3lrieoo7ZGM1LlvqYvnxd45qZNM0XDUJ/qwjE9b YUYyTV7b/85NKvrPlDYZ41GAbyyz9Fw6rAT89onxrqBnS7QY5B6Pr6MwHH/OE4Unul0X unRyhBasbai/HTd7awepMk9lm79WqAA1DAZZlk4ABRWH3qTvYh1MKSlV6M2Zq7UJry7W O//g== X-Gm-Message-State: ALoCoQmYFzCjTJ9PXvfqYHQft0mwfjs/vv9yEQmzFj2FAGBoRi3uiz6ubMNLteOt7cMG9fdEarXR X-Received: by 10.68.204.133 with SMTP id ky5mr96336426pbc.67.1436108437378; Sun, 05 Jul 2015 08:00:37 -0700 (PDT) Received: from [192.168.1.89] (99-8-65-117.lightspeed.davlca.sbcglobal.net. [99.8.65.117]) by mx.google.com with ESMTPSA id a10sm15149339pdn.57.2015.07.05.08.00.35 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 05 Jul 2015 08:00:36 -0700 (PDT) Message-ID: <55994696.1090705@thinlink.com> Date: Sun, 05 Jul 2015 08:00:38 -0700 From: Tom Harding User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: bitcoin-dev@lists.linuxfoundation.org Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Subject: [bitcoin-dev] BIP 68 (Relative Locktime) bug X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 05 Jul 2015 15:00:38 -0000 BIP 68 uses nSequence to specify relative locktime, but nSequence also continues to condition the transaction-level locktime. This dual effect will prevent a transaction from having an effective nLocktime without also requiring at least one of its inputs to be mined at least one block (or one second) ahead of its parent. The fix is to shift the semantics so that nSequence = MAX_INT - 1 specifies 0 relative locktime, rather than 1. This change will also preserve the semantics of transactions that have already been created with the specific nSequence value MAX_INT - 1 (for example all transactions created by the bitcoin core wallet starting in 0.11).