Broken Money mentioned Nostr and was published in August 2023. I assume some other printed books must have at least mentioned it within the year prior to that?
quoting note1u7h…z4ukEverything about all the ledgers and the difference between transaction speed versus settlement speed you can read about in "Broken Money" by LynAlden (npub1a2c…w83a). It is also the first printed book I have read mentioning Nostr.
