[dreadnip]

This part confused me:

“ Suddenly one day about a week in I got a random anonymous message on Signal containing a single file of 1,704 bytes. I cautiously examine this rogue file in a hex editor and find that it looks like a real private key.”

I’m very unfamiliar with Android development so I’m not sure what the author is implying here. Is this some random Humane owner sending his key to him, or maybe a former Humane employee?

[msephton]

Right. I think it's just a way of saying that he got the key through unorthadox means. But I'd say it's quite likely via a former employee.