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

From: Jeff Garzik <[email-masked]>
Date: Thu, 20 Mar 2014 13:31:44 -0400

On Thu, Mar 20, 2014 at 8:12 AM, Adam Back <[email-masked]> 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.

On Thu, Mar 20, 2014 at 4:09 AM, Andreas Schildbach
<[email-masked]> 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/