Starbucks is working with Microsoft to develop a blockchain-based supply chain tracking system and mobile app that will allow customers to track the supply chain journey of the beans they buy and the coffee they drink.

In March, Starbucks announced a "digital transparency plan" that would let it verify their coffee beans as 100% ethically and sustainably sourced.

Last year, Starbucks worked with more than 380,000 coffee farms to ensure ethical sourcing. However, digital real-time traceability will allow customers to know more about their coffee beans, the company said.

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