Can all financial transactions can be described as:

From: Andrew B Brown <andrewbb@gmail.com>
Date: Thu, 28 Feb 2013 15:34:34 -0500
To: <public-web-payments@w3.org>
Message-ID: <CCAB3EDD8592465D9CD7106787E22634@AndrewPC>

One promise for another.
Did each side deliver?

Abbreviated example of a banking protocol:

  transaction
    promise
      1USD
    endpromise
    promise
      1 pack of gum
    endpromise
  endtransaction

Received on Friday, 1 March 2013 17:06:34 UTC