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Cryptocurrencies are a new technology that will change the way we think about money. They are decentralized and run on a peer-to-peer network. This means that they cannot be controlled by any single person or institution. The decentralization of cryptocurrency also means that there is no central source of information about the value of cryptocurrencies and ways to exchange them for other currencies. The main problem with decentralized currencies is that they can be easily stolen by hackers or by other users who don't trust each other.