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Lettuce on the blockchain: Walmart's push lends legitimacy to much-hyped technology

from NBC News

After an E.coli outbreak in romaine lettuce sickened more than 200 people in April, Walmart laid out a strict new policy to its suppliers of salad products. "All fresh leafy greens suppliers are expected to be able to trace their products back to farm(s) (by production lot) in seconds — not days," the company said in a recent letter. more

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