There are now more than 1,500 cryptos - Bitcoin, Bitcoin Cash, Ethereum, Litecoin to name just a few - being traded on about 190 exchanges around the world.
Prices have soared and crashed alarmingly. In 2017 the price of a bitcoin rocketed to nearly £15,000 before losing two-thirds of its value in just a few months. It's currently worth about £5,000.
This volatility may be a speculative trader's friend, but it has reinforced cryptos' reputation for being high-risk investments for the adrenalin-fuelled "get rich quick" brigade.
Crypto fundraising schemes, known as Initial Coin Offerings, have alarmed regulators around the world.
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