Thank you. @tom74

US gold

gold's shortfall is the unknown amounts that the US may have stored decades

Have a look, Thomas

As of November 2017, Fort Knox holdings are 4,582 metric tons (147.3 million oz. troy), with a book value of over $100 billion. In contrast the GDP of the United States was $19.4 Trillion as of 2017 April. Some of the gold in the depository is in the form of monetary gold coins.
Google

Russian & Chinese gold.

unknown quantities from years of Chinese/Russian mining.

• Russia

Blockvault is the answer, or similar technology.

Let’s hope so.