Q&A: Walmart’s Frank Yiannas on the use of blockchain for food safety

Computerworld | By | Oct 1, 2018

walmart and blockchain - Q&A: Walmart's Frank Yiannas on the use of blockchain for food safetyOnce a skeptic about blockchain, Frank Yiannas, Walmart’s vice president in charge of food safety, now contends it's the perfect way to create a transparent, secure and immutable record for tracking food from farm to store shelf.

Walmart is among the most advanced retailers in deploying an IBM blockchain-based supply chain tracking system, which it hopes will bring more than 100 suppliers into an immutable, transparent ledger that can track food from farm to store in seconds.  Last week, Walmart called on all of its suppliers of leafy green vegetables to submit data to the blockchain tracking system by the end of September, 2019.  Frank Yiannas, Walmart's vice president in charge of food safety, was once a skeptic of blockchain, until he began investigating the technology and had what he recently called a "religious conversion" to it.  Deploying blockchain simply for technology's sake, however, is a mistake, said Yiannas. He spoke to Computerworld about Walmart's adoption the distributed ledger food tracking system. Excerpts from that interview follow.

You completed two pilots last year. What's happened since?

Earlier this year, we did a proof of concept with sliced mangoes and did another one with pork in China and imported animal protein. After that..., we reached out to a total of 10 companies, and asked them if they were interested and if they wanted to join, test and scale with us. At some point, I don't know the exact date, we transitioned from pilot into production.

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By collaborating with these 10 other companies, we're now up to 25 different food SKUs or products on blockchain in production, legitimate products going from suppliers to Walmart [distribution centers] to Walmart stores. [The latest]  announcement then accelerates this to a whole broader category of leafy greens.

What advice do you have for enterprises considering blockchain?

The first recommendation is define the business case or what's the problem you're trying to solve. While we believe blockchain is a great use case for supply chain traceability and transparency, you really need to understand what you're trying to solve. We really weren't chasing blockchain, we were trying to solve a business problem.

Once you do that, then I'd recommend they become informed and understand the technology. My recommendation is that it always be business-led but technology-enabled. Often times, people want to relegate blockchain to the technology department in an organization, but it has to be in my view – and why it's been successful here – business led.

Why blockchain? Can't you track food suppliers with a relational database?

You're right. You don't need blockchain to do that with a handful of food products or SKUs. But, blockchain surely helps facilitate it if you have to do it on the scale of 50,000 to 70,000 SKUs. And you need it if you want to do it in a shared and distributed food system where these food system players are also doing business with other retailers and food service organizations.

Frank Yiannas, Walmart's vice president in charge of food safety, spoke during an MIT conference earlier this year on how blockchain reduced the time to track the origin of a package of mangoes from a week to 2.2 seconds.

So, with these linear databases that you're referring to...generally, they have these iron walls around them. So, if you get into the Walmart centralized system and declare information for us..., if you're doing businesses with another retailer, you've got to get into their system and do the same thing. So, there's a lot of redundancy and duplication of effort.

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How will it provide transparency for you and your suppliers?

The food system is  pretty big, distributed, and decentralized. It's not as simple and linear as we think. So, that's one of the reasons blockchain is a good solution..., because it is distributed and decentralized in nature.

Unfortunately, today a lot of transactions that take place, especially as they relate to what we refer to as traceability events – when a food product is handed off from one party to another – and as it travels...occur on paper. So, the current paradigm used is what we refer to one-step-up and one-step-back traceability. Even when it's digitized, it's on disparate systems. So, it's very hard for a retailer like Walmart or any retailer or food services company, health official – or consumer for that matter – to pick up a food item and know with certainty where it came from and how it traveled from farm to store.

What we're trying to do is create the equivalence of FedEx tracking for food; that at each point in the farm-to-food continuum, when there's a traceability event that occurs – a pass off – the information about that product is recorded in the blockchain network. So that record is not only recorded but trusted because of the features of blockchain being immutable and a consensus mechanism.

In some of the early pilots that we've done, we've demonstrated by capturing information along the continuum in the blockchain network we can trace back to source in seconds, not days or weeks.

How can this technology help deal with the potential for food-borne illnesses, such as E. coli?

In the event there's a food-borne outbreak, you want to trace it back to source quickly. The quicker and more precise you can do that, presumably you can stop additional illnesses. So that's preventative in nature. It's also preventative in that it prevents unaffected products from being falsely incriminated.

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The other way it's preventative, while by-and-large the food system is safe, when these incidents do occur you want to be able to trace back to source quickly to do a root-cause analysis to understand what went wrong for future preventative actions. If you can't do rapid traceability, you can never solve for it because you'll never know what were the true contributing factors that lead to that event.

Lastly, the whole idea of being able to digitize and make food [supply] more transparent, it can be preventative in that you can run a smarter and safer supply chain by making sure certain food safety checks are performed at certain places. This is a big idea for public health and for food safety.

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