There is, this though. > chain of hash-based proof-of-work and > chain of blocks in this paper. His later communication does call this "block chain". So yo

There is, this though. > chain of hash-based proof-of-work and > chain of blocks in this paper. His later communication does call this "block chain". So you are right that he/them/she does not use the term "blockchain" in the paper. Nor "block chain" but the term can be extracted from there clearly.