That file will not allow you to see what’s being checked against. The hashes have deliberately been created that way.
That file will also have to change routinely so as to keep up with an expanding database, unless you assume that for some reason no new child porn will ever be added from here on out.
With time we’ll see this file change and we won’t be able to tell if it’s because NCEMC added to their database or because Apple was forced to add material to check against while under gag order not to disclose it. I’d like to say this is harder in the States and much more likely in China, but with all the crap we saw after 9/11, especially with FISA & FISC, I have my doubts here as well.