Here's a couple more stylistic quirks that jump out on a very cursory glance at Nakamoto's public postings. (Disclaimer: I know nothing about Bitcoin but am a pretty experienced copy-editor. None of these are remotely conclusive, just more incremental evidence.)

Satoshi Nakamoto uses double spaces after sentence-final; so does Nick Szabo.

"Interestingly" is a distinctive word, especially at sentence-initial. Both Nakamoto and Szabo use this.

Hyphenated "e-mail" has been on the way out for a few years; I still use it but I've been in a minority for a long time. Again, both Nakamoto and Szabo use this.

(I'd be interested to see if anyone can find Szabo starting paragraphs with "Right, ...": that's a definite tic in Nakamoto's postings.)