Re: [Bitcoin-development] Payment Protocol for Face-to-face Payments

[Alex Kotenko <alexykot@gmail.com>]

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2014-03-20 17:31 GMT+00:00 Jeff Garzik <jgarzik@bitpay.com>:

> On Thu, Mar 20, 2014 at 8:12 AM, Adam Back <adam@cypherspace.org> wrote:
> > Whats a sensible limit on practical/convenient QR code size?
>
> Extremely limited.  Preferably under 100 bytes.  You will see
> increasingly poor operating in varying light conditions, such as
> paying via QR code on a printed receipt in a pub at night.  That was
> one of the motivations for BIP 73.
>
​Hmm, in this case I think base43 discussion is irrelevant. Even with best
space utilization we can get ​we will not be able to fit in anything bigger
than a smallest unsigned payment certificate. And that is not so useful. So
probably we should stick with BIP73 approach and bluetooth URI scheme we're
inventing.



>
>
> On Thu, Mar 20, 2014 at 4:09 AM, Andreas Schildbach
> <andreas@schildbach.de> wrote:
> > Afaik, BIP73 needs an external server (the web server).
>
> Yes.  Internet connectivity is not a rarity these days.  Near-field
> web servers also work fine.
>
> --
> Jeff Garzik
> Bitcoin core developer and open source evangelist
> BitPay, Inc.      https://bitpay.com/
>
>
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