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It helps catch attempted identity theft. Lots of people who are not eligible for employment steal the identities of those who are. But they will have to make up any data they don’t know, or that is inapplicable because the true holder of that identity died a while ago.

So basically I just need to hire a professional with access to a data broker to tell me what a prospective employer already knows about me.

The Work Number might be a good start there. Salary history and stuff apparently.

That is correct. TWN has your full employment and pay history basically.

It's used for background checks to identify relevant criminal records, debt records, etc.

That information can be pulled as part of a background check, if that's required for the job.