From: "Luke-Jr" <luke@dashjr.org>
To: bitcoin-development@lists.sourceforge.net
Date: Fri, 23 Sep 2011 19:21:58 -0400
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Subject: Re: [Bitcoin-development] Beyond IP transactions: towards a bitcoin
	payment protocol
Precedence: list

On Friday, September 23, 2011 7:15:48 PM Pieter Wuille wrote:
> What I want to do is to standardize part of that out-of-band communication
> inside a protocol. 

Email and XMPP are suitable. Just sign the message with the "from" key.

> The first observation is that if you want a freshly negotiated key each
> time, some form of bidirectional communication is necessary anyway, and a
> static txout template does not suffice anymore.

False. Deterministic keypairs remove the necessity of bidirectional 
communication. A standard for a "public key root" "address" could be 
worthwhile.

Both of these combined retain pseudonomity, while providing stateless 
transactions with out-of-band data.