Eager to curb foodborne-illness outbreaks, retail giants like Walmart and Albertsons are turning to blockchain technology  to track exactly where their foods are coming from. Blockchain, as compared to the eye-straining, paper-heavy tracking systems before it, allows retailers to trace the supply-chain history for a single food item within seconds.
For example, in a test case using IBM’s blockchain technology, Walmart traced the supply chain for two off-the-shelf mangoes randomly taken from one of its stores. Using conventional source-checking methods, it took them 7 days to do so. Through blockchain, however, they were able to track the entire supply chain in 2.2 seconds! As a former Walmart executive put it, blockchain “allows us to see the whole chain in seconds! We [could] take a jar of baby food and see where it was manufactured and trace back all the ingredients to the farms!” Before blockchain, that simply would not have been feasible.