In this case, it appears the title had already passed to Grandma. A blockchain title could/should prevent Dealer from shutting down Grandma's car over Grandson

In this case, it appears the title had already passed to Grandma. A blockchain title could/should prevent Dealer from shutting down Grandma's car over Grandson's debt. If Grandson is right about the clause not appearing in the contract, of course, he'd be doubly good. To say it less flippantly, the low-hanging fruit in blockchain-assisted contracting seems to be these automatic self-help remedies and simplifying title disputes -- which, right now require judges and police for even simple disagreements. You'll have fewer wrong denials of access, but perhaps more denials overall.