Title Insurance
  
See: Title Search.
You need title insurance just in case. In case...what? Well, true legit legal title to ownership gets transferred from buyer to buyer when land/homes change ownership hands. Think of the title to it as the pink slip to your car. That pink slip is, more or less, a bearer bond, entitling the owner to one car with the requisite VIN number. So juuuust in case your home doesn't really belong to the guy who sold it to you, and you paid him the $412,000 all in, and he has suddenly disappeared back home to Mogadishu...then that title insurance company owes you your dough back.
That's more or less how it works. It's a rare event when title doesn't convey properly, but it happens. Our guess: with computer tracking and all kinds of back-up, this relic from an era when things were done by hand on paper...won't be around as a meaningful Thing in 20 years. So if you're in that industry, we suggest drone insurance. Way bigger tailwinds there.