Meet the pre-teen whose 'bank balance' is bigger than yours - a 12-year-old crypto expert whose NFTs have traded for more than $5MILLION.Benyamin Ahmed learned to code from his dad when he was just five-year-old, and was instantly hooked.But the bitcoin started rolling in last year when he released his own whale themed collection of NFTs - one-of-a-kind digital artworks which can be bought and sold.His first sale of colourful pixelated whales sold out in hours and netted him £110,000 - a fortune which, combined with his other ventures, has risen to £750,000 in a matter of months.The schoolboy doesn't have a bank account though, and hasn't withdrawn a single pound from his fortune.It's all tied up in a cryptocurrency called Ethereum, which some argue could become worthless before investors even have time to withdraw.But Benjamin - who has lectured at Oxford University on NFTs - reckons it's the future of currency, and he's sitting on a huge future fortune.The child genius plans to leave his fortune where it is for now because he said he's simply only in the game to build his skills and experience.In total, his collection of NFTs has traded - gone on to be sold over and over by other people - for a total more than $5million.And the figure continues to rise as they become more and more popular.