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From tracking virtual tokens to containers of fresh produce

IBM uses technology behind bitcoin to create blockchain, helping companies keep track of their shipments

Wal-Mart has already completed two pilots with IBM - moving pork from Chinese farms to Chinese stores, and produce from Latin America to the United States.

New York

FRANK Yiannas has spent years looking in vain for a better way to track lettuce, steaks and snack cakes from farm and factory to the shelves of Wal-Mart, where he is the vice-president for food safety.

When the company dealt with salmonella outbreaks, it often took weeks...

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