There are however other records which directly dispute this, with the Nihontô Meikan showing 50 different mei or signatures for Nagasone Kotetsu. Additionally, there are Honomi records of sword polishers and master appraisers receiving Mumei or unsigned blades from Nagasone Kotetsu, and adding signature to them later after having completely substantiated the maker and provenance of the sword in question, increasing this count even further.
On the other hand, there are alternative documents that challenge this claim, citing the Nihontô Meikan as evidence of 50 different mei or signatures for Nagasone Kotetsu. Additionally, Honomi records reveal that sword polishers and master appraisers received unsigned blades from Nagasone Kotetsu, which they later signed themselves after verifying the sword's authenticity.