Obviously, gold is the most robust solution in terms of consistency because it's hard to defy laws of physics, Bitcoin comes next and a centralized solution such as EVE money is least robust. The way how Bitcoin solves the problem of consistency is it's core feature, and it can be used to define it as property, for example: record in a database distributed among many people that
solves the Byzantine Generals' Problem is property.
To elaborate:
If we think about our universe as database that perceived the same way by everyone then ownership is access rights to certain records and stealing is unauthorized change of those records, e.g. if I own piece of gold it means that I can change the record about it's location or grant to someone else the right to change it, stealing means that someone changed it's location without my permission. The same definitions can be applied to Bitcoin.
Ownership of bitcoins means you are free to change the record by sending it to anywhere.
Stealing of bitcoins means unauthorized change of the record by sending it to an address controlled by someone else.