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From: Michael Gronager <gronager@ceptacle.com>
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Date: Tue, 27 Nov 2012 09:43:39 +0100
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To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Payment Protocol Proposal:
	Invoices/Payments/Receipts
Precedence: list

Short comments:

* What if the SignedReceipt is not received AND the transactions IS =
posted on the p2p. Then you have payed for the goods, but you don't have =
a receipt. This could happen both from malice or system failures.
** Suggestion - sign the invoice with the key to which to send the =
transaction, the proof of payment, equivalent to a signed receipt is =
then in the blockchain.

This scheme would work both with or without x509, if you want to include =
x509, the message in the invoice could simply be signed by the x509 =
certificate as well.

PRO: Any user can send signed invoices, not only those with a x509 cert.
PRO: No limbo situation with no SignedReceipt
CON: This disables the use of anything but payment to key/address incl =
multisig etc.

However, the wast majority of use will anyway be payment to key/address.

Support of general pay to script could be supported through the payment =
scheme proposed earlier by Mike: No non-fee payments are accepted, =
except in a group - i.e. it is up to the merchant to generate the final =
transaction incl the fees, and that one could be to a general script. =
This also keeps the support of pay to general script needed for a client =
to a minimum.

Cheers,

Michael