No certificate of title issued upon an application to bring land under this Act shall be impeached or defeasible by reason or on account of any informality or irregularity in the application or in the proceedings previous to the registration of the certificate, and every certificate of title issued under this Act shall be received in all courts as evidence of the particulars set forth in the certificate and of the entry of the certificate in the Register Book, and shall be conclusive evidence that the person named in the certificate as the proprietor of or having any estate or interest in or power to appoint or dispose of the land described in the certificate is seized or possessed of that estate or interest or has that power.