889.15 Proceedings of other courts as evidence. The records and judicial proceedings of any court of the United States, or of any state or territory or district thereof and of any foreign country, and copies thereof, shall be admissible in evidence in all cases in this state when authenticated or certified in the manner directed by ss. 889.07 and 889.08 or by acts of congress, or the laws of such state, territory or district, or of such foreign country.