Cryptocurrency or crypto currency is gaining ground in the world and in Africa. It crossed the symbolic threshold of $50,000 per unit and reached record highs. One bitcoin reached corresponds to $53,274. The highest value since Friday, February 19, 2021, a surge of +435% for a year. With more than 18.6 million bitcoins issued since its creation by anonymous people in 2008, the entire market is theoretically worth $990 billion (€815 billion) today. This electronic payment system, published in 2009, is the birth of a global market for purely digital transactions. The system, which is fully decentralized, operates without any central authority or administrator. Transactions are based on block cryptography, which are added to each other and are verified by the nodes of a computer network and are irreversibly recorded in a public ledger called a "blockchain". If bitcoin is the most popular of the system, the main popular ones are ethereum, tether and binance coin. We can also mention the obscure maidsafecoin, dogecoin, monero, factum, bitshares, peercoin, namecoin, lisk, solarcoin... Bitcoin is convertible into a classic currency (euro, dollar...), allowing to carry out financial transactions between individuals or with a company. "Cryptocurrencies, bitcoin in the lead, will prevail for transactions. Individuals will vote for them because transactions become transparent and decentralized. This avoids all conventional intermediaries taking commissions. Today, we can shop in bitcoins via Revolut, tomorrow we will exchange bitcoins between us - for instant and free transfers - and the day after tomorrow we will buy a house with - avoiding the 8% of notary fees, "says Karl Toussaint du Wast, co-founder of the wealth management consulting firm Netinvestissement. As virtual currency is not without consequences, savers who risk cryptocurrencies must be ready to lose their entire bet. This is why the president of the European Central Bank, Christine Lagarde, said in early February that bitcoin was "not a currency" and that it was a "highly speculative asset". However, defenders of bitcoin and cryptocurrencies also have a good point of defense when they point out that these instruments help give freedom to citizens in countries where hyperinflation is rampant.