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Walmart mandates leafy greens suppliers use blockchain by September 2019

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Top Walmart officials notified leafy greens suppliers Monday that by Sept. 30, 2019, all suppliers will need to use blockchain to trace back products in seconds, not days. The landmark move comes as the Yuma, Ariz. season begins for romaine lettuce, and as health officials so far, have been unsuccessful in tracking down the cause of last season’s outbreak.


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