Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id B73BAA5E for ; Sun, 10 Mar 2019 00:43:59 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mo.garage.hdemail.jp (mo.garage.hdemail.jp [46.51.242.127]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 69BEE81A for ; Sun, 10 Mar 2019 00:43:57 +0000 (UTC) Received: from ip-10-217-1-36.ap-northeast-1.compute.internal (localhost.localdomain [127.0.0.1]) by mo.garage.hdemail.jp (hde-mf-postfix) with SMTP id C8F6B14C0E7 for ; Sun, 10 Mar 2019 09:43:56 +0900 (JST) (envelope-from karljohan-alm@garage.co.jp) X-Received: from unknown (HELO mo.garage.hdemail.jp) (127.0.0.1) by 0 with SMTP; 10 Mar 2019 09:43:56 +0900 X-Received: from mo.garage.hdemail.jp (localhost.localdomain [127.0.0.1]) by mo.garage.hdemail.jp (hde-ma-postfix) with ESMTP id BF8744C06D for ; Sun, 10 Mar 2019 09:43:56 +0900 (JST) (envelope-from karljohan-alm@garage.co.jp) Received: from gw23.oz.hdemail.jp (ip-10-185-148-17.ap-northeast-1.compute.internal [10.185.148.17]) by mo.garage.hdemail.jp (hde-mf-postfix) with ESMTP id BD12D14C0E7 for ; Sun, 10 Mar 2019 09:43:56 +0900 (JST) (envelope-from karljohan-alm@garage.co.jp) X-Received: from mail-qk1-f200.google.com (lb06.oz.hdemail.jp [54.238.50.28]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by gw23.oz.hdemail.jp (Postfix) with ESMTP id 600AC148C10B for ; Sun, 10 Mar 2019 09:43:56 +0900 (JST) X-Received: by mail-qk1-f200.google.com with SMTP id j1so1306772qkl.23 for ; Sat, 09 Mar 2019 16:43:56 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=3ilURjriRbYCQa8LWF2X5hvk5D3REfY9on7ISRqRoWE=; b=jdU+EkFg47on+4+lNKmBQfre7nPwxeM2DWeuiQCnYBFrJPyPlMtuVFOc2IlW4FYIT+ 7ybLRqAKFpkiFj75tVZP3pl/Yv1yGHZGUUlEZHY7cguevvdIbkukpUsPRxmWBpGfL6in eqH9j1xBf6885nVW7VwJB05mGcD4qaX6rBVWRjHJPAxbWMtZUCyiugn9AEGZvRtLOVhZ KoRBledMZw60ruPn0L/156yzFZwwZlsAL5huQ5BScvyRK6pf0PBB5Y4jhreiFZwr7FLO bh6NlTtCeskOtTmAUQSceU5uyRRp31Htiu336K+FFmo1NPorTAuf/LHAPGOrKEm0G6WY G0pQ== X-Gm-Message-State: APjAAAULDrsOAMKAbFIAYQ7w8auaEw7j7912/GLEHW+bkIE0vaXhw0DM 9203oY8LPje0M8aznNGOolh4kEMqT//xxLopknMx5LL9CG1AK5pyJ4Xv23wPdsYwOw/WtKdVOju 2qf+a/UrtQL2VFJKqCbauvdI2YL2OIm0UfKBOYqeBdJD5mKKE4SG0Q4+SowRMSRa7L36ZfMJc/z cZz7e0x7zJLLwyQB5lGDuquKuNDnDFi9gzlNgmW6iFBeBBITC8zafNfh6Yzgk9NdyMi5hH30Oqu P8GZWLQOpIYzlbbo8K4nql+PoTYHQHEm2myJjE1cbxVla/kLXw1JLLYo487zCtYt4Vh0kIt4SDl avzg11ecUdN8b7s3wmKpPc9ezPE= X-Received: by 2002:a37:c0cb:: with SMTP id v72mr113370qkv.199.1552178634874; Sat, 09 Mar 2019 16:43:54 -0800 (PST) X-Google-Smtp-Source: APXvYqx3m3Kas6uphVlrQKLdXsjywbX+o20pz88K+Bbi4UI3pngHBzPxgaoSq8Grg1r3Q3bbJxLPMUGeUPAt7sYpxi0= X-Received: by 2002:a37:c0cb:: with SMTP id v72mr113355qkv.199.1552178634645; Sat, 09 Mar 2019 16:43:54 -0800 (PST) MIME-Version: 1.0 References: <939C132D-8599-4258-8F14-62E992BA9F51@mattcorallo.com> In-Reply-To: <939C132D-8599-4258-8F14-62E992BA9F51@mattcorallo.com> From: Karl-Johan Alm Date: Sun, 10 Mar 2019 09:43:43 +0900 Message-ID: To: Matt Corallo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,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: Sun, 10 Mar 2019 13:22:48 +0000 Cc: Bitcoin Protocol Discussion Subject: Re: [bitcoin-dev] Signet 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: Sun, 10 Mar 2019 00:43:59 -0000 Hi Matt, On Sat, Mar 9, 2019 at 5:20 AM Matt Corallo wrot= e: > > To make testing easier, it may make sense to keep the existing block head= er format (and PoW) and instead apply the signature rules to some field in = the coinbase transaction. This means SPV clients (assuming they only connec= t to honest/trusted nodes) work as-is. Keeping the PoW rule and moving the signature would mean DoS attacks would be trivial as anyone could mine blocks without a signature in them, unless you ramped up the difficulty, which would mean it's just another testnet. It's a test network, admittedly, but I think it would kind of defeat the purpose. > A previous idea regarding reorgs (that I believe Greg came up with) is to= allow multiple keys to sign blocks, with one signing no reorgs and one sig= ning a reorg every few blocks, allowing users to choose the behavior they w= ant. Not sure how this would work in practice. The idea with signet is to have an actual network that is occasionally reorged, i.e. it's a global network (for those participating) that everyone agrees on. Not sure how you would have choices there.