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What is blockchain (brief review)? How is it going to transform the supply chain? What else can BC be used for (other than supply chain)? Any of enterprise-application providers (vendors) that you can find that do offer BC solutions for organizations? What are the challenges of implementing BC business usage? Find examples (3-4) of companies/networks that are already using the blockchain in their supply chains; briefly describe how are they using it, what was the impact of use?