Erik Finman was 12 years old when he bought $1,000 worth of Bitcoin in the summer of 2011. The world’s first digital currency was just two years old and trading for $10. A month before he made the purchase, he’d cut a deal with his parents. If he could turn a $1,000 gift from his grandmother into $1 million, he wouldn’t have to attend university. By 2017, he’d won the agreement.