Ok. What I'm saying is that the ability to accept and relinquish an automated security deposit does not require a decentralized technology such as ethereum or even bitcoin.
A machine (like the one I linked above) can accept money and dispense money at the discretion of the business rules that determine the appropriate criteria for these operations (via car sensors or whatever).
A machine (like the one I linked above) can accept money and dispense money at the discretion of the business rules that determine the appropriate criteria for these operations (via car sensors or whatever).