Suppose I have a physical object A. Another person also has some rights over the object A. After some litigations, a schedule has been made under which object A will be passed for some time to the other person (e.g. if I possess A then I must give it to the person at a specific time and then after some agreed upon time he will return it to me). Now, the problem is that I cannot trust the other person and he cannot trust me. At any time when we can cheat each other we will definitely cheat. In this situation, what could be a technologically viable solution for handing over the physical object between untrusting parties? (For example GPS based system or anything of that sort). Thanks in advance.