I did a quick search with the .txt file of "Kicking" but came up empty. Those Adam Back emails (only three or so as I recall) were very early, pre-whitepaper. They show up in the pdf version at page 24. I stuck the txt version into Grok and had it search/think, it came up empty as well. See the query:

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Interesting, you were 100% correct. I was kind of thinking Malmo when you mentioned COPA trial because he had like 150 back and forth and figured just by sheer volume that might have been mentioned. Tha KS for finding that.