On all the Gohonzons issued by Taisekiji and SGI, we find:

1) Facing it, on the upper right-hand side, a phrase
"Jiyaku-Nou-ran-sha, Zu-ha-shichi-bu", means that to those slander will have their head broken in seven places.

2)Facing it, on the upper left-hand side, a phrase
"Yuu-ku-you-sha fuku-ka-juugo", means that to those who
worship, 100% benefit.  None of the known gohonzons
inscribed by Nichiren has those phrases. Even the five
gohonzons inscribed by Nikko at Hon-mon-ji do not have
these phrases.

These phrases only appear in Gosho's p.869 "Haku-roko-sho" (Kechimyaku-sho) which means that this part of the Gosho is also a fake.