The most famous crypto inventor today - Bitcoin - is trying to build a "peer-to-peer electronic cash system". This has been tried many times before, but the main point of difference between Bitcoin and previous attempts like Digicash is that it is fully decentralized. Without a comprehensive entity controlling the currency, the notion of trust will be removed from the system.To combat double spending, the main disadvantage of all the digital cash systems of the time, the inventor of Bitcoin, Satoshi Nakamoto, proposed a revolutionary technology known as blockchain to record all transactions made with its currency.For any balance, transaction, or change to the network to be performed, there will be consensus among those validating the network - the miners. Since the invention of Bitcoin, many other programmers have tried to use the model and tweak it to give what they perceive as a more functional form of digital cassette.Other cryptocurrencies include Litecoin, Monero, Ether, and New Economy Movement. Many of these efforts are adjusting their currency for specific purposes. Speed, price, and privacy, including the most common. Nice @michiel