Governments have maintained reserves for centuries to stabilize the economy, promote trade, and create confidence in their currency. The goods selected to be reserved have also changed over time as world trade, financial systems, and technology evolve. From the shine of gold security to fiat by the US dollar, and from International Monetary Fund Special Drawing Rights (SDRs) to digital reserves such as cryptocurrencies, the development of global reserve assets is a story of diverging economic power and innovation.