Walmart is moving some of its food supply chain onto a blockchain system supplied by IBM. As the NY Times article points out, lost in the detail is the fact that the 'blockchain' will live entirely on IBM's servers - so in other words, this is actually just a 'database'.
Walmart says its blockchain will allow it to track food from the field, through washing and cutting facilities, to the warehouse and finally to the store. It will even be possible to pinpoint which part of the field and at what time the vegetables were harvested. Mr. Yiannas said Walmart was focusing on leafy green vegetables because, along with beef, they tend to have the highest incidences of contagion. “We can bring trust to the system,” he said.