Walmart is among the most advanced retailers in deploying an IBM blockchain-based supply chain tracking system, which it hopes will bring more than 100 suppliers into an immutable, transparent ledger that can track food from farm to store in seconds.

Last week, Walmart called on all of its suppliers of leafy green vegetables to submit data to the blockchain tracking system by the end of September, 2019.

Frank Yiannas Walmart Walmart

Frank Yiannis, Walmart's vice president of food safety.

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