From: Mike Hearn <mike@plan99•net>
To: Jeff Garzik <jgarzik@bitpay•com>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>,
Andreas Schildbach <andreas@schildbach•de>
Subject: Re: [Bitcoin-development] Payment Protocol: BIP 70, 71, 72
Date: Wed, 25 Sep 2013 16:38:58 +0200 [thread overview]
Message-ID: <CANEZrP3KJL1+4ks7VNMDSzNtWGP-5B7fJemD3m-TPQVBAwc_jw@mail.gmail.com> (raw)
In-Reply-To: <CAJHLa0NbEjnQ2V8HPjVfC_mZ33ojMBMQP2i90KvmEsZik7h3kA@mail.gmail.com>
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Low light shouldn't be an issue for QRcodes generated by phones. They have
backlit screens that should always be bright enough. I can see how it might
be an issue for printed codes.
If your phone has no Bitcoin app installed then being redirected to an
invoice page is pretty useless, you still won't be able to pay the bill no
matter what (where do you get the money from?). If they are just raw HTTP
URLs then it means the effect of scanning a QRcode with a standalone
scanner app is different to scanning it inside the wallet, which is unlike
all other uses of QRcodes I know of. So I'm not really convinced by that UX
yet. Perhaps we can thrash it out in Amsterdam. Right now I'm thinking
QRcodes should always contain bitcoin URIs.
On Wed, Sep 25, 2013 at 4:31 PM, Jeff Garzik <jgarzik@bitpay•com> wrote:
> BitPay experimented with QR codes in low light, restaurant and other
> conditions. QR codes become difficult to use even at 100 chars.
>
> On the merchant side, we prefer a short URL that speaks payment
> protocol if visited via bitcoin client, but will gracefully work if
> scanned by a phone with zero bitcoin support -- you will simply be
> redirected to a BitPay invoice page for a normal browser.
>
>
>
> On Wed, Sep 25, 2013 at 7:59 AM, Andreas Schildbach
> <andreas@schildbach•de> wrote:
> > On 09/25/2013 01:45 PM, Mike Hearn wrote:
> >
> >> OK, it might fit if you don't use any of the features the protocol
> >> provides :)
> >
> > Now you're dver-dramaticing (-:
> >
> > I'm just skipping one feature which I think is useless for QR codes
> > scanned in person.
> >
> >> You can try it here:
> >
> > Thanks. A typical request would be around 60 bytes, which should produce
> > an URL with around 100 chars. That should be fine for scanning, but I
> > will experiment.
> >
> >> If you're thinking about governments and so on subverting CA's, then
> >> there is a plan for handling that (outside the Bitcoin world) called
> >> certificate transparency which is being implemented now.
> >
> > Good to hear. Let's see if it gets momentum.
> >
> >> Now when you are getting a QR code from the web, it's already being
> >> served over HTTPS. So if you're up against an attacker who can break a
> >> CA in order to steal your money, then you already lose, the QRcode
> >> itself as MITMd.
> >
> > Sure. I was talking about QR codes scanned in person.
> >
> >> In the Bluetooth case we might have to keep the address around and use
> >> it to do ECDHE or something like that.
> >
> > Yeah, will look at that as soon as we're implementing the payment
> > protocol fully.
> >
> >
> >
> >
> ------------------------------------------------------------------------------
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> > _______________________________________________
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> > Bitcoin-development@lists•sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
>
> --
> Jeff Garzik
> Senior Software Engineer and open source evangelist
> BitPay, Inc. https://bitpay.com/
>
>
> ------------------------------------------------------------------------------
> October Webinars: Code for Performance
> Free Intel webinars can help you accelerate application performance.
> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most
> from
> the latest Intel processors and coprocessors. See abstracts and register >
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>
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next prev parent reply other threads:[~2013-09-25 14:39 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-31 6:28 Gavin Andresen
2013-07-31 8:45 ` Roy Badami
[not found] ` <CABsx9T3Xvnw2H6awgnT7mr-HzJOqCp_nOVM57BD-B9mY4R43aQ@mail.gmail.com>
2013-07-31 11:33 ` Gavin Andresen
2013-07-31 11:45 ` Melvin Carvalho
2013-07-31 23:30 ` E willbefull
2013-07-31 23:38 ` Gavin Andresen
2013-07-31 23:52 ` E willbefull
2013-08-07 20:12 ` Roy Badami
2013-07-31 8:59 ` Mike Hearn
2013-07-31 11:19 ` Gavin Andresen
2013-08-07 20:31 ` Pieter Wuille
2013-08-07 21:10 ` Gavin Andresen
2013-08-07 21:17 ` Mike Hearn
2013-08-07 21:36 ` Pieter Wuille
2013-08-07 21:44 ` Mike Hearn
2013-08-07 21:49 ` Pieter Wuille
2013-08-07 21:28 ` Roy Badami
2013-08-07 21:47 ` Alan Reiner
2013-08-14 10:56 ` Jouke Hofman
2013-08-07 21:47 ` Roy Badami
2013-08-07 21:54 ` Pieter Wuille
2013-08-07 22:03 ` Roy Badami
2013-08-08 0:48 ` Gavin Andresen
2013-08-08 9:13 ` Mike Hearn
2013-08-08 14:13 ` Pieter Wuille
2013-08-19 22:15 ` Andreas Petersson
2013-08-19 23:19 ` Gavin Andresen
2013-08-20 10:05 ` Mike Hearn
2013-09-24 13:52 ` Mike Hearn
2013-09-24 23:35 ` Gavin Andresen
2013-09-25 9:27 ` Mike Hearn
2013-09-25 10:28 ` Andreas Schildbach
2013-09-25 11:15 ` Mike Hearn
2013-09-25 11:33 ` Andreas Schildbach
2013-09-25 11:45 ` Mike Hearn
2013-09-25 11:59 ` Andreas Schildbach
2013-09-25 14:31 ` Jeff Garzik
2013-09-25 14:38 ` Mike Hearn [this message]
2013-09-25 11:35 ` Melvin Carvalho
2013-09-25 16:12 ` The Doctor
2013-09-26 6:37 ` Peter Todd
2013-09-25 14:26 ` Jeff Garzik
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