Cryptocurrencies and blockchain technologies have become increasingly hard to ignore. Case in point: It will be front-and-center at the upcoming lunch between legendary investor Warren Buffett and blockchain company founder, Justin Sun, for which Sun paid a record $4.6 million this year. Each year, Berkshire Hathaway (BRK.B - Get Report) chief Buffett auctions off a lunch with himself in an event that garners nearly as much attention as his company's annual shareholder meeting. Proceeds from the lunch go to support the Glide Foundation, which helps the homeless population in San Francisco. The $4.6 million paid by ... (full story)