Kotofu exists in two copies, the original copy and the counterpart (duplicate copy), and the Order of the Record of Imperial Lineage stipulates that the original should be stored in the Imperial Household Agency and the counterpart in the Ministry of Justice.
皇統譜には原本と副本があり、原本は宮内庁に、副本は法務省に保管することが皇統譜令で定められている。