Subject: Re: [Bitcoin-development] Payment Protocol Proposal: Invoices/Payments/Receipts

From: Mike Hearn <[email-masked]>
Date: Tue, 27 Nov 2012 19:16:53 +0100

> That hash would then be reported via some secure channel outside of bitcoin's
> domain.

OK, I see. I guess that could be a reasonable fallback for the case
where you have a secure channel.

> I don't understand what the relevance of multi-factor is to invoices?

Yes, exactly. It's about paying who you think you're paying (when you
confirm on a second uncompromised device).