Agreed with Mike. It doesn't really matter what the signature field is
set to. Changing the standard now is too hard with too little benefit.

On 4/28/14, 12:14 PM, Mike Hearn wrote:
> Who cares what it is? Setting to an empty byte array is fine, IMO. The
> payment protocol is already rolling out. It's implemented in several
> wallets, BitPay implements it, Coinbase is implementing it, etc.
> 
> -100000 for changing such a basic thing at this point. It'd cause chaos
> for the early adopters, punishing them instead of rewarding them. It'd
> seriously hurt adoption of the payment protocol when it's at its most
> vulnerable. We should mark BIP 70 as accepted and be done with it. 
> 
> 
> 
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-- 
Ryan X. Charles
Software Engineer, BitPay