[ownedbycats]

I used 'Save highlighted key to a .k4a file' and then opened it in a text editor.

There's three lines of alphanumeric characters. The first is 72 characters, the second is 40 characters, and the third is 32 characters.

EDIT: I find 72 characters as a bit odd. I'd expect 64. Googling and BCrypt has a maximum of 72 bytes but that's used for password hashing and I'm not sure if relevant here.