From bitcoin and Ethereum to a host of altcoins, cryptocurrency has become a mainstream investment. But it’s also a volatile industry that keeps participants, observers and regulators on their toes. Get high-profile interviews, explainers and unique stories about this fast-moving sector with CNBC Crypto World.

Cryptocurrencies are digital assets built on decentralized networks that use blockchain technology to record transactions and enforce them without central authority. They are often a target for hackers and used to launder money or buy illicit goods, including drugs, by enabling anonymous purchases on dark web marketplaces. The global leader in cryptocurrencies is bitcoin, which is valued at about $118,000 per coin.

The popularity of cryptocurrencies stems in part from their decentralized nature and the ability to transfer funds quickly and easily, with no need for a middleman like a bank. Some governments have embraced them, while others have moved to regulate or restrict them. For example, China has cracked down on trading in cryptocurrencies and banned bitcoin mining. This has caused the price of cryptocurrencies to plummet.

Some analysts say cryptocurrencies are speculative investments, with people purchasing them because they think their prices will rise. They point to soaring valuations, a lack of a clear economic use case and the risk that they could go to zero value. But others warn that the risks of investing in crypto-assets are much higher than those for traditional securities, such as stocks or bonds. Moreover, they argue that investors are not protected by the same laws as other financial customers, such as deposit insurance.