- crypto-monnaie (French)
No definition in earlier IP projects. ITrust definition not yet developed.
- Blockchain Technologies 2016 (†789 s.v. "Cryptocurrency"): A form of digital currency based on mathematics, where encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds. Furthermore, cryptocurrencies operate independently of a central bank.
- ISO TC307 N55 (France). 2017 (†858 ): Fiduciary value unit of transactions on the Blockchain ecosystem (fiduciary meant for trusted).
- Buterin  (†818 s.v. "History" ): In 2005, Hal Finney introduced a concept of "reusable proofs of work", a system which uses ideas from b-money together with Adam Back's computationally difficult Hashcash puzzles to create a concept for a cryptocurrency, but once again fell short of the ideal by relying on trusted computing as a backend. (†2348)
- Walport 2016 (†802 p.33): Bitcoin is a new form of digital cash. Rather than being issued by a central bank, such as the Bank of England, its issuance is controlled by a decentralised network of computers. This network relies on cryptography and other techniques to regulate the supply of Bitcoins and keep track of who owns them. Bitcoin is consequently known as a cryptocurrency. (†2331)