Centralized, gated and closed on weekends, the New York Stock Exchange is the ultimate architectural symbol of everything bitcoin was created to disrupt. And yet, the 233-year-old titan of Wall Street has quietly positioned itself as an unlikely crypto powerhouse. Between a multibillion-dollar blitz into digital assets and a planned 24/7 trading platform for blockchain-based securities, the storied exchange is undergoing its grandest—and likely riskiest—transformation yet: using the distributed ledger technology behind bitcoin to reinvent the very system it spent centuries building.