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

Mike Hearn mike at plan99.net
Tue Nov 27 12:03:35 UTC 2012

> 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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