Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 84D6040C for ; Tue, 11 Apr 2017 07:59:39 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mx-out03.mykolab.com (mx.kolabnow.com [95.128.36.1]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id A1DEE156 for ; Tue, 11 Apr 2017 07:59:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at kolabnow.com X-Spam-Score: -2.9 X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 Received: from mx03.mykolab.com (mx03.mykolab.com [10.20.7.101]) by mx-out03.mykolab.com (Postfix) with ESMTPS id 629EE2020D for ; Tue, 11 Apr 2017 09:59:35 +0200 (CEST) From: Tom Zander To: bitcoin-dev@lists.linuxfoundation.org Date: Tue, 11 Apr 2017 09:59:33 +0200 Message-ID: <2151650.Y6dYBXdtR5@strawberry> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Tue, 11 Apr 2017 12:50:19 +0000 Subject: Re: [bitcoin-dev] A Small Modification to Segwit 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: Tue, 11 Apr 2017 07:59:39 -0000 The version field is still needed to actually allow future block version=20 upgrades. We would cut off our road forward if that were to be blocked. On Friday, 7 April 2017 22:06:39 CEST Jimmy Song via bitcoin-dev wrote: > Currently, the version bits (currently 4 bytes, or 32 bits) in the header > are used for BIP9 signaling. We change the version bits to a nonce-space > so the miners can use it for overt ASICBoost. The 32-bits are now moved > over to the Coinbase transaction as part of the witness commitment. The > witness commitment goes from 38 bytes to 42 bytes, with the last 4 bytes > being used as the version bits in the block header previously. The > witness commitment becomes required as per Gregory Maxwell=E2=80=99s prop= osal. > Reasoning =2D-=20 Tom Zander Blog: https://zander.github.io Vlog: https://vimeo.com/channels/tomscryptochannel