At common law, ownership was proven via an unbroken chain of title deeds. The Torrens title system is an alternative way of proving ownership. First introduced in South Australia in 1858 by Sir Robert Torrens and adopted later by the other Australian states and other countries, ownership under Torrens title is proven by possession of a certificate of title and the corresponding entry in the property register. This system removes risks associated with unregistered deeds and fraudulent or otherwise incorrect transactions. It is much easier and cheaper to administer, lowering transaction costs. Some Australian properties are still conveyed using a chain of title deeds – usually properties that have been owned by the same family since the nineteenth century – and these are often referred to as 'Old System' deeds.