Work cat: United States. Congress. Senate. Committee on Banking, Housing, and Urban Affairs. Virtual currencies, 2018: p. 4 (cryptocurrencies; so-called virtual currencies)

Merriam-Webster dictionary online, May 24, 2018 (cryptocurrency; any form of currency that only exists digitally, that usually has no central issuing or regulating authority but instead uses a decentralized system to record transactions and manage the issuance of new units, and that relies on cryptography to prevent counterfeiting and fraudulent transactions)

Forbes website, May 25, 2018: search: "what are the two worlds of crypto" (cryptocurrency; growing divide: decentralized coins (such as Bitcoin) vs. centralized coins (such as Ripple); cryptocoins; when you buy a crypto coin, you buy money)

Investopedia website, June 12, 2018: search: cryptocurrency definition (cryptocurrency; not issued by any central authority; do not have a central repository; prices are based on supply and demand) search: digital currency definition (crypto currencies; form of digital currency which uses cryptography to secure and verify transactions and to manage and control the creation of new currency units; since they are unregulated, they are also considered to be virtual currencies)

Vigna, Paul. The age of cryptocurrency, 2015: p. 5 (built around the principle of a universal, inviolable ledger ... in the case of most cryptocurrencies, this network-based ledger is called a blockchain)

Here are entered works on currencies that use cryptography to secure and verify transactions and to control the creation of new currency units. Works on digital representations of monetary value and fiat currencies in digital form are entered under Digital currency.