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

[Mike Hearn]

> Perhaps we should agree to talk about everything _except_ that first?

Yeah, alternatives to X.509 chains don't interest me right now except
in the sense that they should be cleanly implementable with future
extensions.

So if you care about DANE or DNSSEC or custom PKI infrastructures or
whatever, rather than proposing them as replacements here (DOA), just
figure out how you would extend the protocol in Gavins mail in a
future extension. If you can't see a clean way to do it then let's
discuss that. If you can think of a way to do it then let's table it.
Better replacements can come in later BIPs.