Nah, it didn't come off as disagreeing to me so much as subtly distinguishing - I wanted to clarify no disagreement for the readers (so, you're all good).Related note - Double-Spending is absolutely critical with Bitcoin. Satoshi stated in the crytography mailing list that he had been working on bitcoin for a while running tests etc. I think he was more of a double-spending scholar than a digital cash guy (although, I'm not sure how you separate the two concepts in bitcoin - I don't think you can, and that's point) Anyway, I've been holding on to this conference paper abstract for over a year, anyone read it before: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4268195 (note the date, a few months before the Satoshi paper). Actually, the papers at this conference all seem pretty interesting - http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=4268147 . Anyway, Satoshi could very well be an author of that first paper or have attended that conference. Not trying to out him/her/them, only commenting that bitcoin is about double-spending in a big-way to buttress my earlier point.Edit-I also book marked this PhD dissertation abstract a while ago - http://tuprints.ulb.tu-darmstadt.de/1193/