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Cc: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] Payment Protocol Proposal:
Invoices/Payments/Receipts
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> Further, the inclusion of x509 is not really needed in the spec - you don't need to sign the invoice with an x509, you can use the payment key.
No, the point of using X509 certs is to get a verified identity (a
domain name) on the receipt, this is needed for multi-factor
authentication. You can't do that without some kind of third party
asserting to an identity.
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