From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 28DD0BAF for ; Mon, 19 Jun 2017 19:26:30 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from zinan.dashjr.org (zinan.dashjr.org [192.3.11.21]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id BF271203 for ; Mon, 19 Jun 2017 19:26:29 +0000 (UTC) Received: from ishibashi.localnet (unknown [IPv6:2001:470:5:265:a45d:823b:2d27:961c]) (Authenticated sender: luke-jr) by zinan.dashjr.org (Postfix) with ESMTPSA id 3580238A3121 for ; Mon, 19 Jun 2017 19:26:26 +0000 (UTC) X-Hashcash: 1:25:170619:bitcoin-dev@lists.linuxfoundation.org::M1+EURhu6rB/yGpY:AINt From: Luke Dashjr To: bitcoin-dev@lists.linuxfoundation.org Date: Mon, 19 Jun 2017 19:26:22 +0000 User-Agent: KMail/1.13.7 (Linux/4.9.16-gentoo; KDE/4.14.32; x86_64; ; ) X-PGP-Key-Fingerprint: E463 A93F 5F31 17EE DE6C 7316 BD02 9424 21F4 889F X-PGP-Key-ID: BD02942421F4889F X-PGP-Keyserver: hkp://pgp.mit.edu MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Message-Id: <201706191926.25006.luke@dashjr.org> X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD 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] BIP148 temporary service bit (1 << 27) 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: Mon, 19 Jun 2017 19:26:30 -0000 To ease the transition to BIP148 and to minimise risks in the event miners choose to perform a chain split attack, at least Bitcoin Knots will be using the temporary service bit (1 << 27) to indicate BIP148 support. Once the transition is complete, this will no longer be necessary, and the bit will be (manually) returned for reuse. I encourage other software implementing BIP148 (both full and light nodes) to set and use this service bit to avoid network partitioning risks. Luke