Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 2E6B992B for ; Fri, 27 Jan 2017 03:04:52 +0000 (UTC) X-Greylist: whitelisted by SQLgrey-1.7.6 Received: from mail-ua0-f180.google.com (mail-ua0-f180.google.com [209.85.217.180]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 6BFDB1D7 for ; Fri, 27 Jan 2017 03:04:51 +0000 (UTC) Received: by mail-ua0-f180.google.com with SMTP id i68so196085772uad.0 for ; Thu, 26 Jan 2017 19:04:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=7heD2OcMnjvhcMAVr6LQQ7FXpA/YH73uhjWps3PxVKA=; b=la3Bpg5T8HOwnqL2Xtlo6PoWPYcA5jlWousALkrWv5048RLZf5nwz+LRrpKaUZcWby W8gs1p20+z5ZbOORxq/HZFWxAtC1YZ43MQQPbkYhGYQIDqkuPGyJrbW2JJLvrhHFPLyw O+8EyvQhJwHhjeKB2g53PqebBKrc5zii5O5SpyoGP+XEWCDezYoZn/Ory5kkyNq5CgzF gUpFZQMT9EmAJY0ZdaGQzYvdsUhAJN9LeOFKpLSx1blUoAFql6RKuQ/mqj1vxyBFFznA lQNRHkzjkgczilHPzUiejZFPrAqGRgaeBIv5uCRWpE38nHjGnU95EG3V0epgTd2ly8Es pthg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=7heD2OcMnjvhcMAVr6LQQ7FXpA/YH73uhjWps3PxVKA=; b=RNBT909oGSYmc6mSFqlU7ZQ9EbKEMBGTk6VqFUE9oN8VoSUYSi7xL2lK8FIUrqfCUx cwfwDsKBuawcJSCHcG8FdHR2M1kwJO4oDT4IQ/2pF7v/swhHtUxB2FvvHaaPIz2aMzOA Yq+PZhTQx18YLGJj2/UfQlu9NetlWdVpn5lnsz65H4VezMYoFOJWTIAWO4VhDJzg7LX7 GhIGy4yFKCN9y7WR+upXOa7hRPCw4ajEIUfg/3N9y43fLC8KrLoug3Zl5sgzTm9KTbTJ U+MqUqTAlNuPiXCvhTt9pzBk9eWKlIcktCBbPBwuAzgLorcneEKv8PaGxds3ERZI+FPO irdA== X-Gm-Message-State: AIkVDXKpuj/j1Mg5/uHlDp0pf87ztTOh3ogSAS2yqiLyu46i1kUGHGOEwdvpM2Rza3LhPpftKg5TM0MebXpNoQ== X-Received: by 10.159.37.71 with SMTP id 65mr2757797uaz.134.1485486290579; Thu, 26 Jan 2017 19:04:50 -0800 (PST) MIME-Version: 1.0 Received: by 10.103.152.19 with HTTP; Thu, 26 Jan 2017 19:04:50 -0800 (PST) Received: by 10.103.152.19 with HTTP; Thu, 26 Jan 2017 19:04:50 -0800 (PST) In-Reply-To: References: <201701270107.01092.luke@dashjr.org> From: Andrew Johnson Date: Thu, 26 Jan 2017 21:04:50 -0600 Message-ID: To: Luke Dashjr , Bitcoin Dev Content-Type: multipart/alternative; boundary=94eb2c12308aab373205470abaae X-Spam-Status: No, score=-1.2 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_ENVFROM_END_DIGIT,FREEMAIL_FROM, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, RCVD_IN_SORBS_SPAM autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org X-Mailman-Approved-At: Fri, 27 Jan 2017 04:35:41 +0000 Subject: Re: [bitcoin-dev] Three hardfork-related BIPs 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: Fri, 27 Jan 2017 03:04:52 -0000 --94eb2c12308aab373205470abaae Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Comment on #1. You're dropping the blocksize limit to 300KB and only reaching the limit that we have in place today 7 years later? We're already at capacity today, surely you're not serious with this proposal? When you promised code for a hard forking block size increase in the HK agreement I don't believe that a decrease first was made apparent. While not technically in violation of the letter of the agreement, I think this is a pretty obviously not in the spirit of it. On Jan 26, 2017 7:07 PM, "Luke Dashjr via bitcoin-dev" < bitcoin-dev@lists.linuxfoundation.org> wrote: I've put together three hardfork-related BIPs. This is parallel to the ongoing research into the MMHF/SHF WIP BIP, which might still be best long-term. 1) The first is a block size limit protocol change. It also addresses three criticisms of segwit: 1) segwit increases the block size limit which is already considered by many to be too large; 2) segwit treats pre-segwit transactions =E2=80=9Cunfairly=E2=80=9D by giving the witness discount only= to segwit transactions; and 3) that spam blocks can be larger than blocks mining legitimate transactions. This proposal may (depending on activation date) initially reduce the block size limit to a more sustainable size in the short- term, and gradually increase it up over the long-term to 31 MB; it will als= o extend the witness discount to non-segwit transactions. Should the initial block size limit reduction prove to be too controversial, miners can simply wait to activate it until closer to the point where it becomes acceptable and/or increases the limit. However, since the BIP includes a hardfork, the eventual block size increase needs community consensus before it can be deployed. Proponents of block size increases should note that this BIP does not interfere with another more aggressive block size increase hardfork in the meantime. I believe I can immediately recommend this for adoption; however, peer and community review are welcome to suggest changes. Text: https://github.com/luke-jr/bips/blob/bip-blksize/bip-blksize.mediawik= i Code: https://github.com/bitcoin/bitcoin/compare/master...luke- jr:bip-blksize (consensus code changes only) 2) The second is a *preparatory* change, that should allow trivially transforming certain classes of hardforks into softforks in the future. It essentially says that full nodes should relax their rule enforcement, after sufficient time that would virtually guarantee they have ceased to be enforcing the full set of rules anyway. This allows these relaxed rules to be modified or removed in a softfork, provided the proposal to do so is accepted and implemented with enough advance notice. Attempting to implement this ha= s proven more complicated than I originally expected, and it may make more sense for full nodes to simply stop functioning (with a user override) after the cut-off date). In light of this, I do not yet recommend its adoption, but a= m posting it for review and comments only. Text: https://github.com/luke-jr/bips/blob/bip-hfprep/bip-hfprep.mediawiki 3) Third is an anti-replay softfork which can be used to prevent replay attacks whether induced by a hardfork-related chain split, or even in ordinary operation. It does this by using a new opcode (OP_CHECKBLOCKATHEIGHT) for the Bitcoin scripting system that allows construction of transactions which are valid only on specific blockchains. Text: https://github.com/luke-jr/bips/blob/bip-noreplay/bip- noreplay.mediawiki Luke _______________________________________________ bitcoin-dev mailing list bitcoin-dev@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev --94eb2c12308aab373205470abaae Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Comment on #1.=C2=A0 You're dropping the blocksi= ze limit to 300KB and only reaching the limit that we have in place today 7= years later?=C2=A0 We're already at capacity today, surely you're = not serious with this proposal?=C2=A0 When you promised code for a hard for= king block size increase in the HK agreement I don't believe that a dec= rease first was made apparent.=C2=A0 While not technically in violation of = the letter of the agreement, I think this is a pretty obviously not in the = spirit of it.

On Jan 26, 2017 7:07 PM, "Luke Dashjr= via bitcoin-dev" <bitcoin-dev@lists.linuxfoundation.org> wrote:
I've put together three hardfork-re= lated BIPs. This is parallel to the ongoing
research into the MMHF/SHF WIP BIP, which might still be best long-term.
1) The first is a block size limit protocol change. It also addresses three=
criticisms of segwit: 1) segwit increases the block size limit which is
already considered by many to be too large; 2) segwit treats pre-segwit
transactions =E2=80=9Cunfairly=E2=80=9D by giving the witness discount only= to segwit
transactions; and 3) that spam blocks can be larger than blocks mining
legitimate transactions. This proposal may (depending on activation date) initially reduce the block size limit to a more sustainable size in the sho= rt-
term, and gradually increase it up over the long-term to 31 MB; it will als= o
extend the witness discount to non-segwit transactions. Should the initial<= br> block size limit reduction prove to be too controversial, miners can simply=
wait to activate it until closer to the point where it becomes acceptable and/or increases the limit. However, since the BIP includes a hardfork, the=
eventual block size increase needs community consensus before it can be
deployed. Proponents of block size increases should note that this BIP does=
not interfere with another more aggressive block size increase hardfork in = the
meantime. I believe I can immediately recommend this for adoption; however,=
peer and community review are welcome to suggest changes.
Text: https://github.com/luke-= jr/bips/blob/bip-blksize/bip-blksize.mediawiki
Code: https://github.com/bitc= oin/bitcoin/compare/master...luke-jr:bip-blksize
(consensus code changes only)

2) The second is a *preparatory* change, that should allow trivially
transforming certain classes of hardforks into softforks in the future. It<= br> essentially says that full nodes should relax their rule enforcement, after=
sufficient time that would virtually guarantee they have ceased to be
enforcing the full set of rules anyway. This allows these relaxed rules to = be
modified or removed in a softfork, provided the proposal to do so is accept= ed
and implemented with enough advance notice. Attempting to implement this ha= s
proven more complicated than I originally expected, and it may make more se= nse
for full nodes to simply stop functioning (with a user override) after the<= br> cut-off date). In light of this, I do not yet recommend its adoption, but a= m
posting it for review and comments only.
Text: https://github.com/luke-jr= /bips/blob/bip-hfprep/bip-hfprep.mediawiki

3) Third is an anti-replay softfork which can be used to prevent replay
attacks whether induced by a hardfork-related chain split, or even in ordin= ary
operation. It does this by using a new opcode (OP_CHECKBLOCKATHEIGHT) for t= he
Bitcoin scripting system that allows construction of transactions which are=
valid only on specific blockchains.
Text: https://github.com/luk= e-jr/bips/blob/bip-noreplay/bip-noreplay.mediawiki

Luke
_______________________________________________
bitcoin-dev mailing list
bitcoin-dev@lists.= linuxfoundation.org
https://lists.linuxfoundation.org= /mailman/listinfo/bitcoin-dev

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