> There's presumably some value in things like digitally signing odometer entries, titles marked as salvage, etc, from dealerships to discourage meddling. It's an area where corruption/fraud has been around a long time.

What value do you presume?

Having the odometer readings digitally signed in a blockchain database does zilch to prevent fraud. The fraud happens when the person inputs the reading.

Likewise, "titles marked as salvage . . . from dealerships to discourage meddling" -- what about blockchain discourages "meddling" over what can be done with a centralized database in the control of the state?