Walmart is asking all of its leafy greens suppliers to get on blockchain by this time next year. With instances of E. coli on the rise, particularly in romaine lettuce, Walmart is insisting that its suppliers use blockchain to track and trace products from source to the customer. Walmart notes that, while health officials at the Centers for Disease Control told Americans have already warned citizens to avoid eating lettuce grown in Yuma, Arizona, it’s near impossible for consumers to know where their greens are coming from. On one hand this could be a great system for reducing waste. Earlier…

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