The largest reserve gold traders on the planet are the six bullion banks. A bullion bank is a large multi-national bank authorized to serve as a conduit through which Central Banks – and the Fed primary dealers – loan their gold out into the market. All central banks lease gold, to maintain their balance sheet and to provide sovereign collateral when a currency swap or paper trade won’t work. It’s called the gold carry trade.
https://www.lewrockwell.com/2019/11/no_author/syria-is-lost-lebanons-gold-is-next/