From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-3.v43.ch3.sourceforge.com ([172.29.43.193] helo=mx.sourceforge.net) by sfs-ml-3.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1UemGr-0004LQ-Md for bitcoin-development@lists.sourceforge.net; Tue, 21 May 2013 13:06:29 +0000 Received-SPF: pass (sog-mx-3.v43.ch3.sourceforge.com: domain of petertodd.org designates 62.13.148.100 as permitted sender) client-ip=62.13.148.100; envelope-from=pete@petertodd.org; helo=outmail148100.authsmtp.co.uk; Received: from outmail148100.authsmtp.co.uk ([62.13.148.100]) by sog-mx-3.v43.ch3.sourceforge.com with esmtp (Exim 4.76) id 1UemGp-0006UZ-Uz for bitcoin-development@lists.sourceforge.net; Tue, 21 May 2013 13:06:29 +0000 Received: from mail-c232.authsmtp.com (mail-c232.authsmtp.com [62.13.128.232]) by punt5.authsmtp.com (8.14.2/8.14.2/Kp) with ESMTP id r4LD6L0K058200; Tue, 21 May 2013 14:06:21 +0100 (BST) Received: from tilt (dhcp184-48-74-214.hil-sckmthx.sjc.wayport.net [184.48.74.214]) (authenticated bits=128) by mail.authsmtp.com (8.14.2/8.14.2/) with ESMTP id r4LD6Ew8027181 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Tue, 21 May 2013 14:06:17 +0100 (BST) Date: Tue, 21 May 2013 06:06:13 -0700 From: Peter Todd To: Robert Backhaus Message-ID: <20130521130613.GB27580@tilt> References: <519AC3A8.1020306@quinnharris.me> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="jy6Sn24JjFx/iggw" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Server-Quench: 3a128255-c217-11e2-b10b-0025903375e2 X-AuthReport-Spam: If SPAM / abuse - report it at: http://www.authsmtp.com/abuse X-AuthRoute: OCd2Yg0TA1ZNQRgX IjsJECJaVQIpKltL GxAVKBZePFsRUQkR aAdMdAMUFVQNAgsB AmUbWlBeUFt7WGs7 agJVcwFVfE1KQQdr VFdMSlVNFUsqBWB1 AGtZWhlwcAROeTB3 bURlEHMKXUZyd0N4 Xx1WFGobZGY1an1N UUAKagNUcgZDfhxG bVUqVj1vNG8XDQg5 AwQ0PjZ0MThBJSBS WgQAK04nCWoMAzQ4 Slg5BTgpEQUjQDky IR0tI0IdG0B5 X-Authentic-SMTP: 61633532353630.1019:706 X-AuthFastPath: 0 (Was 255) X-AuthSMTP-Origin: 184.48.74.214/587 X-AuthVirus-Status: No virus detected - but ensure you scan with your own anti-virus system. X-Spam-Score: -1.5 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 SPF_PASS SPF: sender matches SPF record X-Headers-End: 1UemGp-0006UZ-Uz Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Double Spend Notification X-BeenThere: bitcoin-development@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 May 2013 13:06:29 -0000 --jy6Sn24JjFx/iggw Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, May 21, 2013 at 01:39:30PM +1000, Robert Backhaus wrote: > That's good - what I had taken away from the replace-by-fee discussions w= as > that it was finally decided. >=20 > My opinion is that we should be doing what we can to make 0-confs as > reliable as possible - which will always be 'not very', but a solid system > to notify on attempted double-spends is a good start. >=20 > I'd like to know how Peter Todd's experiment with the 2BTC reward has gon= e. piuk wrote a double-spender that I think meets the criteria for the reward: https://blockchain.info/create-double-spend I'll get a chance to test it properly when I'm back from vacation, but looks like he's getting the 2BTC. If it does work as intended I'm also planning on doing a demo/video at the next Toronto Bitcoin Meetup to demonstrate the attack in a real-life exchange. --=20 'peter'[:-1]@petertodd.org 00000000000000f31f5cd20f915e3edb8e3fceea49580235b984fea63f1f882c --jy6Sn24JjFx/iggw Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQEcBAEBCAAGBQJRm3FAAAoJEH+rEUJn5PoEkiUH/jQQFcZXAp5B+s9kRGSKZqsY Cen5/w/YW7v+bcLBryn+o72zPPVsQI8PdYpPBBs5WNJFBy0Kfnup/RG2FjBDSKow DkiN/0PqK3j2m6uH5RvJkOluXWRXRtzXxz0mGTYWNPWjCTOOKZ17d2kWZTTOywjt uRP1iCUYthz/fpSR2f8PrphTyL/Z8WyK49VFy1Fa78Xv87Ph9xDZzQGbfHt69vAJ BUnO5bI7f6tglNiJuMV9v5oFRegNwM3d7hnEXCGYosq8YRSjkF09ab+fNjGj5p/V ofg9AUwDKKVG+7zlbbVeEhpKf3Uf8Jns+xG204twiG6v0xhTYQ8NCmMdak/pxEw= =+5d8 -----END PGP SIGNATURE----- --jy6Sn24JjFx/iggw--