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Date: Sat, 26 Apr 2014 18:43:50 +0100
From: Ross Nicoll <jrn@jrn.me.uk>
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To: Mike Hearn <mike@plan99.net>, 
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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Error handling in payment protocol
 (BIP-0070 and BIP-0072)
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I'd be very cautious of security implications of embedding files into
the payment request. Even file formats one would presume safe, such as
images, have had security issues (i.e.
https://technet.microsoft.com/library/security/ms11-006 )

Longer term I was wondering about embedding the PaymentRequest into web
pages directly via the <object> tag, which could eliminate need for
BIP0072 and potentially improve user interface integration that way.
Obviously this would require browser plugins, however.

Ross

On 26/04/14 18:36, Mike Hearn wrote:
>> PaymentRequests are limited to 50,000 bytes. I can't think of a reason why
>> Payment messages would need to be any bigger than that. Submit a pull
>> request to the existing BIP.
>>
> In future it might be nice to have images and things in the payment
> requests, to make UIs look prettier. But with the current version 50kb
> should be plenty indeed.
>