Chris Kelsey reportedly became a millionaire overnight when he sold his app development company Appsitude at the age of 19.

Just two years later, he believes his new venture into cryptocurrency is going to lead to even more financial success.

In a detailed blog post on Medium, Kelsey has laid out how he plans to expand his wealth, stating that he wants to 'change the world in a way that has never been done before'. 

Mr Kelsey, based in Los Angeles, laid out his plans in an in-depth Medium blog post. 

Writing in it, he said: 'I became a f***ing millionaire at 19. I finessed my way there and I didn't give the time of day to anyone who wanted to stop me.

'Now I'm on my way to becoming the youngest self-made billionaire in the world at 21. I will become the world's first trillionaire.

'My goal is to change the world in a way that has never been done before. Most billionaires are p****** afraid to make a difference, thankfully I'm not a little b****.'