Analysis of a possible bug in the ntHash code (or maybe I'm missing something obvious in my implementations...)
I recommend clicking on the "Launch binder" button above and exploring the notebook interactively (GitHub doesn't keep some of the formatting). Alternatively, use nbviewer (which preserves the formatting).
UPDATE: I opened an issue and seems
like the current master version is the culprit (more specifically
57af16a).
Reverting back to the 1.0.4 release
fixes the problem. There is a new section at the end of the notebook with more details.