Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 79B122180 for ; Thu, 8 Oct 2015 17:41:26 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail148096.authsmtp.net (outmail148096.authsmtp.net [62.13.148.96]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 0973D27D for ; Thu, 8 Oct 2015 17:41:24 +0000 (UTC) Received: from mail-c235.authsmtp.com (mail-c235.authsmtp.com [62.13.128.235]) by punt17.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t98HfNZ8065737; Thu, 8 Oct 2015 18:41:23 +0100 (BST) Received: from muck (de2x.mullvad.net [46.165.208.203]) (authenticated bits=128) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id t98HfKP3032047 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Thu, 8 Oct 2015 18:41:22 +0100 (BST) Date: Thu, 8 Oct 2015 19:41:20 +0200 From: Peter Todd To: Rusty Russell Message-ID: <20151008174120.GA9291@muck> References: <20151003143056.GA27942@muck> <87lhbgn4fa.fsf@rustcorp.com.au> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="4Ckj6UjgE2iN1+kY" Content-Disposition: inline In-Reply-To: <87lhbgn4fa.fsf@rustcorp.com.au> X-Server-Quench: ca9b39eb-6de3-11e5-b39a-002590a15da7 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aAdMdgoUF1YAAgsB AmMbWlxeVFx7W2E7 bwxPbANYfEhOVxto UEtWR1pVCwQmRRUJ fkhlMhpydAdGfHk+ YEJiXj4IDU0odk8o EFNSQTgFeGZhPWUC AkNRJh5UcAFPdx8U a1UrBXRDAzANdhEy HhM4ODE3eDlSNhEd aSEgBnEpbH82MxgX ai4vJxQBLAVADxo+ ZxorJ1JUGUELPw0v KlYqUEkVKFcODW8W GkZRATFQO1RJWyom RQhaVEgRHVUA X-Authentic-SMTP: 61633532353630.1023:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 46.165.208.203/587 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: bitcoin-dev@lists.linuxfoundation.org Subject: Re: [bitcoin-dev] CHECKSEQUENCEVERIFY - We need more usecases to motivate the change X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Bitcoin Development Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Oct 2015 17:41:26 -0000 --4Ckj6UjgE2iN1+kY Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Oct 06, 2015 at 12:28:49PM +1030, Rusty Russell wrote: > Peter Todd via bitcoin-dev > writes: > > However I don't think we've done a good job showing why we need to > > implement this feature via nSequence. >=20 > It could be implemented in other ways, but nSequence is the neatest and > most straightforward I've seen. >=20 > - I'm not aware of any other (even vague) proposal for its use? Enlighte= n? There's three that immediately come to mind: Gregory Maxwell has proposed it as a way of discouraging miners from reorging chains, by including some of the low-order bits of a previous block header in nSequence. A few people have proposed implementing proof-of-stake blocksize voting with nSequence. > - BIP68 reserves much of it for future use already. Well, a few low-order bits, if you want to use RCLTV functionality; pure RCLTV would save a lot more bits. > If we apply infinite caution we could never use nSequence, as there > might be a better use tommorrow. Indeed! But lets make sure we have a good argument in the BIP. --=20 'peter'[:-1]@petertodd.org 00000000000000000de60f807a5fd32057510e7715038ecbc888052861b6a5c1 --4Ckj6UjgE2iN1+kY Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQGrBAEBCACVBQJWFqq9XhSAAAAAABUAQGJsb2NraGFzaEBiaXRjb2luLm9yZzAw MDAwMDAwMDAwMDAwMDAwZGU2MGY4MDdhNWZkMzIwNTc1MTBlNzcxNTAzOGVjYmM4 ODgwNTI4NjFiNmE1YzEvFIAAAAAAFQARcGthLWFkZHJlc3NAZ251cGcub3JncGV0 ZUBwZXRlcnRvZC5vcmcACgkQwIXyHOf0udyM+Af9Fta4GSWvY3JEumGy/FgsoRpD cOTcvwkoWD/YlwvnhVbiPc9hzvSngi022s3XDw8qQTUXqaV22hxQ/Iwd37SqAjEr Vvr6mPlJwxAJ0S/zznifY0cfPwHfFtUceB/QpwatT/QoDlHqYLbmxxSjuPuL8g2q BRO2XGdE7X22nOLqnybO4JOHKlsnlO/xLdeoZUml173DVKR7UA0TJi+CadIkU1Bs GTNAjrug8IgoxdZE2Cn82EGyQMGgItzLlch0d0Lw6VIn7Z+14B8dyEMWJAHbZxnE GbDD1fMTlffb+0LRmlFHVJ7RqxSKYcH7qLIwplUNITLI1e8LjqY6Katcs5I8ng== =TzhN -----END PGP SIGNATURE----- --4Ckj6UjgE2iN1+kY--