Central bank policymakers oversee the money supply as part of monetary policy. Money is made up of assets that are used to purchase goods and services as well as acting as a store of value, a unit of account, and a medium of exchange. Cryptocurrencies are virtual money that exchange values through the use of cryptography. Their system is based on blockchain technology, which keeps a public, decentralized ledger of all transactions. The Wall Street Journal's article "What is Cryptocurrency, and How Does It Work?"
