After the establishment of kin-za, the Goto family only worked for appraising and approving of gold coins as Gokin Aratame-yaku (inspector of gold coins) at the official residence in Hongoku-cho and actual casting was performed by workmen called koban-shi.
金座成立以後、後藤家は御金改役（ごきんあらためやく）として本石町の役宅において金貨の鑑定と検印のみを行い、実際の鋳造は小判師（こばんし）などと呼ばれる職人達が行っていた。