Vitalek Buterin is the billionaire founder of Ethereum, one of the most successful blockchains and cryptocurrencies in the world. With his fortune, he is attempting to solve the problem of death by creating a longevity state - which will fast track life everlasting, without the need for regulation.

They will crowdsource their longevity solutions and organise them through the blockchain. His north star is the Fable of the Dragon Tyrant.

In this series, technology reporter and psychologist Aleks Krotoski explores the frontiers of the extreme longevity pioneers. They've made their money in Silicon Valley. And with their technology solutions - PayPal, Facebook, cryptocurrencies - they've ushered in the world that we live in today, with all its unintended consequences. Some of them now want to solve the "problem" of aging, or even death, and they are making bigger strides than we may think.

Can they? Should they?

A Pillowfort production for BBC Radio 4

New episodes released Mondays. If you're in the UK, listen to the full series of Intrigue: The Immortals first on BBC Sounds: bbc.in/3WEQS5W