Which calligraphers wrote for coins in the Song Dynasty?

According to legend, Su Dongpo wrote Yuan Feng and Yuan You wrote Qian Wen. Song Huizong is writing Chongning Bao Tong and Daguan Bao Tong in an original fine gold font. Regular script and running script are better than seal script and official script. The art of calligraphy on coins in Song Dynasty reached an unprecedented height.