Wall Street’s Biggest Move to Blockchain Begins—With Limits

One promise of the blockchain is that it could simplify the behind-the-scenes work of stock trades on Wall Street. That vision is due for its first real-world test in the coming days, when market infrastructure giant the Depository Trust and Clearing Corp. plans to demonstrate live stock trades on the blockchain. Still, the exercise will be modest. After years of work by the biggest U.S. clearinghouse to bring stocks onto the blockchain, the event on Wednesday this week is expected to involve...