If you want the TLDR; the meat is the "Candidates" section about Len Sassaman and the original Bitcoin paper's references (in particular, how Len was the only person with the right skill set, in the right place, at the right time to even get a copy of the referenced work).... among a mountain of other circumstantial evidence.
https://arxiv.org/pdf/2206.10257v14.pdf
If you want the TLDR; the meat is the "Candidates" section about Len Sassaman and the original Bitcoin paper's references (in particular, how Len was the only person with the right skill set, in the right place, at the right time to even get a copy of the referenced work).... among a mountain of other circumstantial evidence.