bb590813 ...

... is someone who does not wish to be recognized for who they are. That much is obvious. Otherwise one would just sign their name.

But the internet allows a certain level of annonymity that you can't easily find elsewhere. Anyone who can access the information to find one's identity is so far removed, that it is unlikely they would even care to know. To complicate matters further, you might need access to more than one unrelated data-base to get to an actual name.

Without a subpoena, it is unlikely you could get the information, even if you knew who to ask.

That leaves only two reasonable alternatives. Someone who discovers an identity based on revealed information or writing style, and then publishes or broadcasts the alias.

Or the person could just choose to reveal their own identity.

So, can you keep a secret?