From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sog-mx-4.v43.ch3.sourceforge.com ([172.29.43.194] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1WzVuj-0001NB-Nz for bitcoin-development@lists.sourceforge.net; Tue, 24 Jun 2014 18:57:53 +0000 Received-SPF: pass (sog-mx-4.v43.ch3.sourceforge.com: domain of gnomon.org.uk designates 93.93.131.22 as permitted sender) client-ip=93.93.131.22; envelope-from=roy@gnomon.org.uk; helo=darla.gnomon.org.uk; Received: from darla.gnomon.org.uk ([93.93.131.22]) by sog-mx-4.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1WzVuh-0002CT-J4 for bitcoin-development@lists.sourceforge.net; Tue, 24 Jun 2014 18:57:53 +0000 Received: from darla.gnomon.org.uk (localhost.gnomon.org.uk [127.0.0.1]) by darla.gnomon.org.uk (8.14.3/8.14.3) with ESMTP id s5OIYZEH098811 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 24 Jun 2014 19:34:40 +0100 (BST) (envelope-from roy@darla.gnomon.org.uk) Received: (from roy@localhost) by darla.gnomon.org.uk (8.14.3/8.14.1/Submit) id s5OIYYmJ098810; Tue, 24 Jun 2014 19:34:34 +0100 (BST) (envelope-from roy) Date: Tue, 24 Jun 2014 19:34:34 +0100 From: Roy Badami To: Jeff Garzik Message-ID: <20140624183434.GG14815@giles.gnomon.org.uk> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-06-14) 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_HELO_PASS SPF: HELO matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record X-Headers-End: 1WzVuh-0002CT-J4 Cc: Bitcoin Dev Subject: Re: [Bitcoin-development] Proposed BIP 70 extension 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, 24 Jun 2014 18:57:53 -0000 On Tue, Jun 24, 2014 at 10:21:46AM -0400, Jeff Garzik wrote: > On Tue, Jun 24, 2014 at 9:27 AM, Mike Hearn wrote: > > Wallets would then be able to persist this data to disk and compete on cool visualisations for how much money you saved over time. > > heh, this is a cool idea. > > It also seems like it would be subject to instant inflation, as it's > unprovable, and a rational economic actor may choose to exaggerate > such numbers. It also seems collectively rational by some points of > view for all bitcoin actors to inflate this number. Rather than offering discounts, how about offering automatic cashback? I know they're kinda stupid, but I gather cashback deals are very commonplace in the US and (probably as a result) not unheard of elsewhere. So you add an optional cashback_to field to the Payment message, distinct from but conceptually similar to the refund_to field. The wallet can tally up how much cashback is received, without having to trust the merchants. Much harder to game, AFAICS. roy