A 21-year-old upstart believes he can beat the likes of Amazon founder Jeff Bezos, Facebook CEO Mark Zuckerberg, and Tesla chairman Elon Musk to become the first trillionaire in history.

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'.

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A 21 year old upstart believes he can take on the big boys of the tech world to become the world's first trillionaire. Chris Kelsey (pictured) reportedly became a millionaire overnight when he sold his his app development company Appsitude at the age of 19

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****.'

His latest venture, dubbed Kelsey Coin, is a digital bank with its own currency based on the US dollar.

The virtual coin offers instant payments to anyone anywhere in the world via their Facebook email.

Kelsey Coin has no transaction fees, as well as full-time support from its founder.

'Our vision is to create a fair global economy,' Mr Kelsey said in a written statement on the currency's website.

'There will always be a total of 1.2 trillion Kelsey Coin and this value will never change. One Kelsey Coin equals $1 (£0.76).'

Kelsey Coins are currently only available by contacting Mr Kelsey directly, but his firm plans to build and deploy Kelsey Coin ATMs that let you deposit cash in exchange for Kelsey Coin using your Facebook email.

Whether they will be able to compete in an increasingly crowded marketplace, dominated by Bitcoin and others, remains to be seen.

Not everyone is convinced, with one user sarcastically labelling one of Mr Kelsey's many YouTube videos 'self congratulating and self promoting'.

On Reddit, one person summed up his feelings saying: 'You sound like a cocaine fuelled t***, mate.'

Kelsey Coin (website pictured) is a digital bank with its own currency based on the US dollar. It offers instant payments to anyone via their Facebook email, anywhere in the world, along with no transaction fees as well as full-time support from its founder

Just two years after his first big business success, Mr Kelsey believes his latest venture into cryptocurrency is going to lead to his true fortune. This image shows his Kelsey Coin account

WHAT IS THE KELSEY COIN CRYPTOCURRENCY? Kelsey Coin is a digital bank with its own currency based on the US dollar set up by millionaire founder Chris Kelsey. It offers instant payments to anyone via their Facebook email, anywhere in the world, along with no transaction fees as well as full-time support from its founder. 'Our vision is to create a fair global economy,' Mr Kelsey said in a written statement. 'There will always be a total of 1.2 trillion Kelsey Coin and this value will never change. One Kelsey Coin equals $1 (£0.76). Kelsey Coins are currently only available by contacting Mr Kelsey directly, but his firm plan to build and deploy Kelsey Coin ATMs that let you deposit cash in exchange for Kelsey Coin using your Facebook email. Advertisement

Jeff Bezos is the richest man in modern human history. The founder and CEO of online retail giant Amazon became worth $150billion (£114bn) last week.

The $150billion mark breaks the record once held by Microsoft founder Bill Gates, who at the height of the dot-com boom was worth $149billion (£113bn) after adjusting for inflation.

In 1999, Gates’ net worth hit its peak, reaching $100billion (£76bn), which translates to $149billion in today’s dollars.

For years, Gates and Bezos were neck-and-neck in the race to be the world’s richest human. However, former Microsoft CEO has donated a large chunk of his fortune to charity and has devoted himself to philanthropic endeavors.

Gates is currently worth $95.5billion (£73bn), according to Bloomberg.

Bezos is expected to become a trillionaire in September 2030, at the age of 66, according to reports in Fin 24.

Tesla's Elon Musk is expected to join him at the age of 78, in November 2050.

Facebook's CEO Mark Zuckerberg is anticipated to pip him at the post, hitting the trillionaire mark in December 2044 at the age of 60.

Jeff Bezos is the richest man in modern human history. The founder and CEO of online retail giant Amazon became worth $150billion (£114bn) last week and is expected to become a trillionaire in September 2030, at the age of 66 (stock image)

Tesla's Elon Musk is expected to join him at the age of 78, in November 2050. Facebook's CEO Mark Zuckerberg is anticipated to pip him at the post, hitting the trillionaire mark in December 2044 at the age of 60 (stock image)