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From: Jeff Garzik <jgarzik@bitpay.com>
Date: Sat, 22 Mar 2014 13:24:43 -0400
Message-ID: <CAJHLa0NtpFnvWLNa=poOKho-wH7gXevNj=WfAaoWFxDMCSCZrw@mail.gmail.com>
To: Mark Friedenbach <mark@monetize.io>
Content-Type: text/plain; charset=ISO-8859-1
Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Payment Protocol for Face-to-face Payments
Precedence: list

One participant, yes.  Two participants lacking net would require a
serious revisit of BIP 70's security assumptions and some design, at a
minimum.

On Sat, Mar 22, 2014 at 12:55 PM, Mark Friedenbach <mark@monetize.io> wrote:
> Jeff, there are *plenty* of places that lack local Internet access for
> one or both participants.
>
> Obviously making the case where both participants lack access to the
> bitcoin network is difficult to secure, but not impossible (e.g. use a
> telephany-based system to connect to a centralized double-spend
> database, as VISA does).
>
> I expect the case where one participant has Internet access (the
> merchant) and the other does not to be very, very common. The majority
> of transactions I do on a daily basis are like this, and I live in
> Silicon Valley!
>
> On 03/22/2014 09:35 AM, Jeff Garzik wrote:
>> Let's not pull out silly examples.  Of course you can find locations
>> that lack Internet.
>>
>> Those locations are completely unsuitable to bitcoin transactions,
>> since the receiver cannot verify double-spending or anything else
>> about the transaction.
>
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-- 
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/