Act Governing Relations between the People of the Taiwan Area and the Mainland Area Article 7

Documents produced in the Mainland Area shall be presumed to be genuine provided that they are authenticated by the institution set up or designated, or by the private organization entrusted by the Executive Yuan.
中文原文 臺灣地區與大陸地區人民關係條例第7條
在大陸地區製作之文書,經行政院設立或指定之機構或委託之民間團體驗證者,推定為真正。

English translation for reference only; the Chinese text prevails. Not legal advice.