For anyone interested in reading more about the standards of gold storage and exchange, the company BuillionVault has some good information on their help/FAQ pa

For anyone interested in reading more about the standards of gold storage and exchange, the company BuillionVault has some good information on their help/FAQ pages, such as explaining what 'good delivery' bars of gold mean, and how professional gold vaulting works. (Naturally, the pages also promote their own services, but you can ignore all of that) e.g. https://www.bullionvault.com/gold-guide/ready-to-buy-gold https://www.bullionvault.com/gold-guide/ready-to-buy-gold