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 4ACF1279 for ; Tue, 9 Aug 2016 00:46:47 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from outmail149080.authsmtp.com (outmail149080.authsmtp.com [62.13.149.80]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 73180FB for ; Tue, 9 Aug 2016 00:46:46 +0000 (UTC) Received: from mail-c232.authsmtp.com (mail-c232.authsmtp.com [62.13.128.232]) by punt21.authsmtp.com (8.14.2/8.14.2/) with ESMTP id u790kgie099941; Tue, 9 Aug 2016 01:46:42 +0100 (BST) Received: from petertodd.org (ec2-52-5-185-120.compute-1.amazonaws.com [52.5.185.120]) (authenticated bits=0) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id u790kegO046464 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 9 Aug 2016 01:46:41 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by petertodd.org (Postfix) with ESMTPSA id D156E40104; Tue, 9 Aug 2016 00:43:44 +0000 (UTC) Received: by localhost (Postfix, from userid 1000) id 2E84B2054D; Mon, 8 Aug 2016 17:46:33 -0700 (PDT) Date: Mon, 8 Aug 2016 17:46:33 -0700 From: Peter Todd To: Luke Dashjr Message-ID: <20160809004633.GA1653@fedora-21-dvm> References: <20160720054654.GA1420@fedora-21-dvm> <201607200617.40917.luke@dashjr.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Kj7319i9nmIyA2yE" Content-Disposition: inline In-Reply-To: <201607200617.40917.luke@dashjr.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-Server-Quench: bd04d5f2-5dca-11e6-829e-00151795d556 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aQdMdgsUGUATAgsB AmAbW1VeVFt7XWI7 bghPaBtcak9QXgdq T0pMXVMcUQJhAUdU UWEeVh92cQEIcHdy ZwgwCnBfCEEsd1t4 Fh0FCGwHMGF9YGIW BV1YdwJRcQRDe0tA b1YxNiYHcQ5VPz4z GA41ejw8IwAXAgVt Cg0XJFwOEw4rIhoX DwwYFDM0FEYZRiI1 NHQA X-Authentic-SMTP: 61633532353630.1037:706 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 Cc: bitcoin-dev@lists.linuxfoundation.org Subject: Re: [bitcoin-dev] BIP draft: HTLC transactions 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: Tue, 09 Aug 2016 00:46:47 -0000 --Kj7319i9nmIyA2yE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 20, 2016 at 06:17:39AM +0000, Luke Dashjr wrote: > On Wednesday, July 20, 2016 5:46:54 AM Peter Todd via bitcoin-dev wrote: > > On Tue, Jul 19, 2016 at 10:35:39PM -0600, Sean Bowe via bitcoin-dev wro= te: > > > I'm requesting feedback for Hash Time-Locked Contract (HTLC) transact= ions > > > in Bitcoin. > > >=20 > > > HTLC transactions allow you to pay for the preimage of a hash. CSV/CL= TV > > > can be used to recover your funds if the other party is not cooperati= ve. > > > These > > >=20 > > > scripts take the following general form: > > > [HASHOP] OP_EQUAL > > > OP_IF > > > =20 > > > > > > =20 > > > OP_ELSE > > > =20 > > > [TIMEOUTOP] OP_DROP > > > =20 > > > OP_ENDIF > > > OP_CHECKSIG > >=20 > > Note that because you're hashing the top item on the stack regardless > > scriptSig's that satisfy HTLC's are malleable: that top stack item can = be > > changed anything in the digest-not-provided case and the script still > > passes. >=20 > OP_SIZE > OP_IF > [HASHOP] OP_EQUALVERIFY > > OP_ELSE > [TIMEOUTOP] > > OP_ENDIF > OP_CHECKSIG Ha! That's brilliant; good job. --=20 https://petertodd.org 'peter'[:-1]@petertodd.org --Kj7319i9nmIyA2yE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJXqSfmAAoJEGOZARBE6K+yNcYH+gNEXPMrL9wxg2LVDPsk8hyS VIgHUB2SOoJ7jyNADBqPy8CAwOBe/SZ/ziLjQuFXKACk7ZMkNL5zu4nTtwK4mKhQ m7iRI8njopN4uh1iOvZ5wQIYwV2qeb4XdjR8GfBFBGT2tGzL0u5Ihy1YC/hx8cW/ RKMNp1vHFnBAXU1Y8GFw6odAbKSZd7S4tScqfTfFjZZ+uv9CGDeYyfFZsLJr1tLb ps5gX7Y85kroRgaTCJZHFi9aW043lRKBwGUZP3yQUu1R+2i7cj0yHnLJHsokAHG6 rh/6ZNz2SA6m8d3SkYh6SnaFtmSGt7C7kRMTGzxNRuHxcok82Haatqhj/TCxkF4= =j1Jk -----END PGP SIGNATURE----- --Kj7319i9nmIyA2yE--