Convinced that blockchain is on the brink of transforming the package-delivery business, FedEx is testing the technology to track large, higher-value cargo. From a report: "We're quite confident that it has big, big implications in supply chain, transportation and logistics," Chief Executive Officer Fred Smith said at a blockchain conference in New York. "It's the next frontier that's going to completely change worldwide supply chains." Blockchain uses computer code to record every step of a transaction and delivery in a permanent digital ledger, providing transparency. The ledger can't be changed unless all involved agree, reducing common disputes over issues like time stamps, payments and damages. FedEx's interest in blockchain and the Internet of Things are part of the company's strategy to improve customer service and fend off competition, Smith said.