 Once this process is complete, the current state of the title, as it is sequentially updated by registration of future transactions, is embodied in a certificate of title which both evidences and guarantees title, subject only to the exceptions provided by statute and matters of federal law.The initial decree of registration and the subsequent certificate of title are actions "in rem".Registration is useful when title is insufficient to support a conclusion of ownership under the traditional recording system, or is clearly defective, and the putative owner desires to make the title good and marketable.