Thème 1 - Finance called Satoshi Nakamoto. It must be noted that Blockchain technology uses a lot of computer power and therefore electrical power and is not considered " green " . Bitcoin creators are said to be " mining " bitcoins. Bitcoins may be used as a means of payment and exchanged for other currencies. Cryptocurrencies are very different from the national tenders in the sense that they are completely decentralized. BBC 6 minute English on Bitcoin: https://www.bbc.co.uk/learningenglish/english/features/6-minute- english/ep-210927 It must be noted that at the time this book is being written, the trend on cryptocurrencies is not positive; the bitcoin having lost a lot of its value and not being out of the woods, yet. Furthermore, FTX Trading Limited which was created in 2018 to exchange crypto currencies and other financial instruments collapsed in November 2022. & TECHNICAL TERMS A medium (plural media) of exchange Cryptography Blockchain 42 Un moyen ou instrument d'échange La cryptographie Blockchainhttps://www.bbc.co.uk/learningenglish/english/features/6-minute