In voluntary transactions the owner’s certificate of title must be presented along with the writing or instrument conveying or effecting the sale, and thereupon and not otherwise the register shall be authorized to register the conveyance or other transaction upon proof of payment of all delinquent taxes or liens, if any, or if such payment be not shown the entry and new certificate shall note such taxes or liens as having priority thereto. (1913, c. 90, s. 15; C.S.,  s. 2411.)