Kinzo claims that, in exchange for his soul, the witch Beatrice gave him ten tons of gold. Towards the end of his life, Kinzo created the witch's epitaph and displayed it beneath a large portrait of Beatrice in the Ushiromiya Main Building. Anyone who solves the riddle of the epitaph would discover Kinzo's gold and inherit the family headship from him.
- While most of the gold is located beneath Rokkenjima, a single ingot is owned by Krauss Ushiromiya and is hidden away in the Ushiromiya Main Building. This ingot was given to Krauss as proof that the gold exists.
- Not adjusting for inflation, ¥20 billion amounts to only about $200 million by today's standards. However, adjusting for inflation, by 1986, when Umineko no Naku Koro ni takes place, the gold is worth roughly $1.2 billion or around ¥100 billion. Furthermore, adjusted for inflation, by today's standards the gold is worth around $2.6 billion or ¥319 billion.
- Kinzo's gold accounts for roughly 0.005% of all the gold in the world and roughly 0.01% of all the gold mined by humans.