GameStop and Bitcoin renewed a push to digitize the stock market

A tectonic digital shift is starting to happen. Many have dreamed of using blockchain technology to enable digital trading of virtually any asset. Recent developments suggest that this concept is now closer to reality than ever before, as experiments in blockchain-based exchanges with nearly instant trading are gaining traction. But, critics warn of volatility and risk. Here, Paul Vigna examines the people behind the push to transform the stock market.