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 DF81E72A for ; Mon, 13 Feb 2017 10:54:21 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-pf0-f178.google.com (mail-pf0-f178.google.com [209.85.192.178]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 63665CD for ; Mon, 13 Feb 2017 10:54:20 +0000 (UTC) Received: by mail-pf0-f178.google.com with SMTP id e4so26872979pfg.1 for ; Mon, 13 Feb 2017 02:54:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=voskuil-org.20150623.gappssmtp.com; s=20150623; h=subject:to:references:cc:from:message-id:date:user-agent :mime-version:in-reply-to; bh=xq/H1Z8n0S9CqY8Kkwv/scpfQRtIDflQxrUYW7tehO4=; b=if5Y7E+0tLrWi1cGhiVTmk0WnD9c+j3nuPHVqDMrTkujS5lqPk/x1a9L000BpAkvBa CdaQWndAJ3tevRGMzQ+OfupXHiifzKq/LIhk2pfRvw06OiMcU7SiAJU38ZcpLMqBpAU2 LC2euFjFdDBtsuUHXr2yIZXLn1sjHiE57uJGfcKXjjC0dX7ubmxxc9cHcjY7h0fEPtFA VWp+7JRR0F/NmE8qo0wYImq+4PAGnMpQN+Kwrx2H41ukSW73bc/4BEifz8bBQ7wMCn4P H65EfO+KLBbe394qcV1FYM+t+2rDZuwpESoPooLcFCWOlrbtI3yrTjjixsOnVZh7Ac8e QZ6g== 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:cc:from:message-id:date :user-agent:mime-version:in-reply-to; bh=xq/H1Z8n0S9CqY8Kkwv/scpfQRtIDflQxrUYW7tehO4=; b=pNxRpHoQ+G56813f4/itl+o4SRL0Yw6acp3FHa/3ASPw2+PyIwL1M+sixyBB83sJp0 Pj5tBbFyPEFiBPh+RI5Rp2QSu5W56jO7graYAV51pyJaaenZfXEFEvZQ6H58EOZJNR/C dkT4aiw0r+c7zvQvhG6d+SN44BcJEDhWUx8Uhs2aupeujGVFKTdQU/w1u6Mbvk6zExTq LtiselWD8D1koYEw2HAXnNCdFRtCm8ZzUW19qerBkuEelpGW/49jvRvYWoX3bTFcqLGj gy12JYwM6vUs+PK3SLwujfbvnZA7v04BKHZZnqtLBytAeTkGrkzUXCWkGNXut25HhU7Z 6RMw== X-Gm-Message-State: AMke39nr6Zu6rdgmNzT9Skqm+ndmif6JVN5gV6P2o0MfS8XX2G9FZUghIygxKKaizlLZCg== X-Received: by 10.98.252.203 with SMTP id e194mr25275646pfh.8.1486983259916; Mon, 13 Feb 2017 02:54:19 -0800 (PST) Received: from ?IPv6:2601:600:9000:d69e:29fe:db3d:631d:9499? ([2601:600:9000:d69e:29fe:db3d:631d:9499]) by smtp.gmail.com with ESMTPSA id 19sm13928953pfj.107.2017.02.13.02.54.18 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Feb 2017 02:54:18 -0800 (PST) To: Matt Corallo , Bitcoin Protocol Discussion , Pieter Wuille References: <424C9E40-0B90-46A6-9C5E-30AE3E84E119@mattcorallo.com> From: Eric Voskuil X-Enigmail-Draft-Status: N1110 Message-ID: <9ca02a65-23df-5eb4-f9bd-7e05b54ec4ea@voskuil.org> Date: Mon, 13 Feb 2017 02:54:23 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <424C9E40-0B90-46A6-9C5E-30AE3E84E119@mattcorallo.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="rLjSAArkAN4xWPuSQ4FlU5RdD4aD4VV56" 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: Mon, 13 Feb 2017 11:43:34 +0000 Cc: libbitcoin@lists.dyne.org Subject: Re: [bitcoin-dev] BIP151 protocol incompatibility 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, 13 Feb 2017 10:54:22 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --rLjSAArkAN4xWPuSQ4FlU5RdD4aD4VV56 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 02/13/2017 02:16 AM, Matt Corallo wrote: > For the reasons Pieter listed, an explicit part of our version handshake and protocol negotiation is the exchange of otherwise-ignored messages to set up optional features. Only if the peer is at the protocol level that allows the message: compact blocks: https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L217-L242 fee filter: https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L211-L216 send headers: https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L204-L210 filters: https://github.com/bitcoin/bitcoin/blob/master/src/protocol.h#L170-L196 > Peers that do not support this ignore such messages, just as if they had indicated they wouldn't support it, see, eg BIP 152's handshake. Not sure why you consider this backwards incompatible, as I would say it's pretty clearly allowing old nodes to communicate just fine. No, it is not the same as BIP152. Control messages apart from BIP151 are not sent until *after* the version is negotiated. I assume that BIP151 is different in this manner because it has a desire to negotiate encryption before any other communications, including versio= n. e --rLjSAArkAN4xWPuSQ4FlU5RdD4aD4VV56 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBAgAGBQJYoZBfAAoJEDzYwH8LXOFOQgUIAJf2JQ6x2sDvZl2EsfWjp+2W 7pOFOZpQl3RrlOxB43lS0WyPsqjuIZNfx2b3UGJYU051bJJku8FskiTv+WHQ520E yXPu9Je+dqbdUzchR1w7bql1iH5z8MaBw2lT9siWEmXfQnmTdtPjYrykUlb6s/GB W1Tj06HWFI8SiEAgn+AVIYr1Wj1DXwNd06DIabAIIZ7tGYBtTlhUN0GbUPEfkqxr UNDxKeS3/ASMZTHaObq/yC3ZN30/al7fi6OGPhjcmByCtljWOBq84CjHwbSg4DHg L1YnuRA67mdT+VO2lqUGKyHPGGBXiqFr3C/4C8ui2O93Hp8oRB/lVHYA4dPA54E= =Ayxv -----END PGP SIGNATURE----- --rLjSAArkAN4xWPuSQ4FlU5RdD4aD4VV56--