Blockchain-based Food Supply Chain Traceability
Sector: Secondary sector · Industry: Food and beverage industry · Organisation: Walmart, Carrefour · Maturity level: Production
Walmart and Carrefour use blockchain technology to dramatically improve food traceability and enable rapid response to contamination incidents. Walmart reduced tracing time for mangoes from 7 days to 2.2 seconds while cutting product recall costs by up to 80 percent. This solution is based on IBM Food Trust and Hyperledger Fabric, achieving complete transparency from production to sale.
Documentation status
- Project status: Production
- Evidence: Evidence high
- Editorial review: Ufuk Avci, 15 April 2026
Description
Walmart launched its first blockchain pilots in 2016 with IBM and Tsinghua University in China (pork traceability). In 2018, the US pilot project with IBM Food Trust for mangoes followed. The result became one of the most cited blockchain successes worldwide: traceability time reduced from 6 days, 18 hours and 26 minutes to 2.2 seconds.
The starting point: When Frank Yiannas (then Walmart VP Food Safety) launched a mango traceability experiment in 2017, it took 6 days, 18 hours and 26 minutes to trace a mango back to its source. The problem with food recalls is not only speed but precision: without accurate traceability, often the entire product category must be removed from the shelves — including unaffected goods. IBM Food Trust (Hyperledger Fabric) solves this: each mango is marked with a unique ID; every transfer is blockchain-documented; a query immediately shows the exact origin. From September 2019, Walmart made participation in IBM Food Trust mandatory for all suppliers of leafy vegetables and fresh greens. IBM Food Trust network: 300+ partners including Carrefour, Nestlé, Dole, Golden State Foods, McCormick. The German Food Association documented the Walmart model as best practice for Germany. Cost of a food recall: on average 10 million USD direct costs, plus reputational damage.
Perspectives
B2B — organisations perspective
Retailers and food manufacturers can carry out recalls in seconds with IBM Food Trust — precisely identify affected batches, keep healthy products on the shelves, and avoid reputational damage caused by blind mass recalls.
B2C — consumers perspective
Supermarket customers benefit twice: in the event of a recall, only truly affected products are removed; and via QR codes, consumers can trace the origin of their food in seconds.
Employees perspective
Employees in quality assurance and logistics gain access to real-time data that makes their daily work easier and faster. New career paths are emerging in blockchain technology and data analysis for supply chains.
Benefits
General
- Traceability time shortened from days or weeks to a few seconds.
- Recall costs reduced by up to 80 percent through precise identification of affected batches.
- Complete transparency of the supply chain builds trust among partners and customers.
B2B — organisations
- Drastic reduction of liability risks through fast and precise problem identification in the supply chain.
Employees
- Employees gain access to real-time data that significantly accelerates decision-making and problem-solving.
Challenges
General
- Integration of all supply chain partners requires comprehensive standardisation and training.
- High initial investments in IT infrastructure and blockchain technology are necessary.
B2B — organisations
- Smaller suppliers need to be convinced and supported with technical integration.
Employees
- Extensive training is required to qualify employees in handling the new technology.
Technology foundation
The solution is based on Hyperledger Fabric, a private blockchain technology specifically developed for enterprise networks. IBM Food Trust provides the cloud-based platform that enables every step of the supply chain to be immutably documented and retrieved within seconds.
Implementation examples
Walmart blockchain traceability for mangoes
Walmart wanted to drastically reduce the response time for food recalls and the associated costs. At the same time, customer trust in food safety was to be strengthened.
Walmart implemented blockchain traceability for mangoes and reduced tracking time from 7 days to 2.2 seconds.
In 2016, Walmart launched a pilot project for blockchain-based traceability of mangoes from the USA. After a successful testing phase, the system was put into production and enables the origin of contaminated fruit to be identified in 2.2 seconds instead of the previous 7 days. The solution is based on IBM Food Trust and Hyperledger Fabric and immutably records every step from farm to shelf on the blockchain.
Traceability time reduced from 7 days to 2.2 seconds, recall costs cut by up to 80 percent
Traditional paper-based traceability was too slow and inaccurate, leading to overly broad recalls and high costs. Sources of contamination could often not be precisely identified.
Tags
Supply chain, Traceability, Food safety, Transparency, Hyperledger