I don't know if I understood your idea correctly but there is something called as slock.it which runs on blockchain and they have good IOt projects.A simple remotely controlled lock for example.Right now they haven't based bitcoins as their primary methods but yeah the underlying idea is still the same IE blockchain.
Slock.it is a pipe dream and will never work.
Who the hell would ever install a remote lock that requires ether to unlock it? You certianly wouldnt for a personal home lock, and no hotel would ever rent to an anonymous meth producer.
Exactly, there is no, no way something like this would ever be implemented. I'll just take a key and open my locks, thanks. There is absolutely no need for a lock that requires a cryptocurrency to unlock. It might be "safer" because it is harder (much harder) to forge a wallet address and use it as a way to sign into a lock, but an electronic lock is a bad idea from the get-go. If someone just wants to screw up your day, they can take a magnet to it and make it harder for you to get back into your house. They don't necessarily have to break into anything.