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 AE905BCF for ; Wed, 9 May 2018 19:45:11 +0000 (UTC) X-Greylist: delayed 00:17:31 by SQLgrey-1.7.6 Received: from outmail148113.authsmtp.com (outmail148113.authsmtp.com [62.13.148.113]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id E8189682 for ; Wed, 9 May 2018 19:45:10 +0000 (UTC) Received: from mail-c245.authsmtp.com (mail-c245.authsmtp.com [62.13.128.245]) by punt20.authsmtp.com. (8.15.2/8.15.2) with ESMTP id w49JRbvk015166; Wed, 9 May 2018 20:27:37 +0100 (BST) (envelope-from user@petertodd.org) Received: from petertodd.org (ec2-52-5-185-120.compute-1.amazonaws.com [52.5.185.120]) (authenticated bits=0) by mail.authsmtp.com (8.15.2/8.15.2) with ESMTPSA id w49JRZoB057517 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 9 May 2018 20:27:36 +0100 (BST) (envelope-from user@petertodd.org) Received: from [127.0.0.1] (localhost [127.0.0.1]) by petertodd.org (Postfix) with ESMTPSA id DF0EC400BF; Wed, 9 May 2018 19:27:34 +0000 (UTC) Received: by localhost (Postfix, from userid 1000) id 577062222A; Wed, 9 May 2018 15:27:33 -0400 (EDT) Date: Wed, 9 May 2018 15:27:33 -0400 From: Peter Todd To: Johnson Lau , Bitcoin Protocol Discussion Message-ID: <20180509192733.6aif4wapolbb5z7c@petertodd.org> References: <87po25lmzs.fsf@rustcorp.com.au> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="cqp4iwdhqcmyciql" Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) X-Server-Quench: 07d073ba-53bf-11e8-a283-9cb654bb2504 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZIVwkA IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aQdMdgsUFVQNAgsB Am4bWVReUlp7WmU7 bghPaBtcak9QXgdq T0pMXVMcUwFhe35r WWweVx53dgIIf3hx YQhiWSRbW0coJFt4 QRwCCGwHMG99OWIX U11RJFFSdQcYLB1A alQxNiYHcQ5VPz4z GA41ejw8IwAXDS1W QwcCZXUqdnoxIxN0 XAwLGzkmB0FSLxvX X-Authentic-SMTP: 61633532353630.1039:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 52.5.185.120/25 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 Subject: Re: [bitcoin-dev] Making OP_TRUE standard? 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: Wed, 09 May 2018 19:45:11 -0000 --cqp4iwdhqcmyciql Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 10, 2018 at 01:56:46AM +0800, Johnson Lau via bitcoin-dev wrote: > You should make a =E2=80=9C0 fee tx with exactly one OP_TRUE output=E2=80= =9D standard, but nothing else. This makes sure CPFP will always be needed,= so the OP_TRUE output won=E2=80=99t pollute the UTXO set >=20 > Instead, would you consider to use ANYONECANPAY to sign the tx, so it is = possible add more inputs for fees? The total tx size is bigger than the OP_= TRUE approach, but you don=E2=80=99t need to ask for any protocol change. >=20 > In long-term, I think the right way is to have a more flexible SIGHASH sy= stem to allow people to add more inputs and outputs easily. I don't think that will work, as a zero-fee tx won't get relayed even with CPFP, due to the fact that we haven't yet implemented package-based tx relaying. --=20 https://petertodd.org 'peter'[:-1]@petertodd.org --cqp4iwdhqcmyciql Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEFcyURjhyM68BBPYTJIFAPaXwkfsFAlrzS6AACgkQJIFAPaXw kfvW0wf/ULVBiKK33f221DJPW7uIpfRsxl2s7n7U9PWyAWSqdjub/EAtqFaqQNfN 7atKZ62H8sUYjtT4rW5T8kxGHj2gvbWEAHizC5aKZZLyfmpd5u9kmn6UHPnK0AnB dX16D5D9Lch+iRSGE/m0hPEEJXvP1QrwO73JtyrI076v+G+gs8fde8l6Pw5wi94v U88Ode5E6NUfBAZxbY0yDVE2NeW2iA2hT934cJlI6hPWmNPSfWkNxMi8eYoSBGv2 b/GCQBhaDYEcL//GRTGWRYIvOqVBSD7fvRU7PECcvlqhyT7lWq8qyhJJY473G27h B8wmf7sEU3RvBqxjGBF8cGtXxmHFlQ== =fAEn -----END PGP SIGNATURE----- --cqp4iwdhqcmyciql--