It doesn't. hence: proof of work.

A better direction would be thinking of how to irreversibly imbue data with the PoW.

When I thought about that a little, I ended up with: you have to have an entire compute stack that respects PoW-imbued-data and only talks to other computers that do the same. And then I walked away from the idea because I realized it was just Urbit/Plunder/OPFN/doomed again.