How the process of creating your own digital currency – known as an “Initial Coin Offering” – is raising billions for startup companies, but also raising fears among regulators that amateur investors are being scammed out of their money.

Rory Cellan-Jones talks to entrepreneurs around the world who claim they will use blockchain tech to disrupt everything from online dating to luxury car investment. And he hears from sceptics who warn the ICO craze is down to a bubble in cryptocurrencies that’s set to burst.

(Photo: The litecoin, ripple and ethereum cryptocurrency 'altcoins'. Credit: Jack Taylor/Getty Images)