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3. ‘IBM and Hejia launch blockchain-based supply chain financial services platform for pharmaceutical procurement’,2017
4. ‘Cyber-attacks raise questions about blockchain security’;Kuchler;FT,2016
5. Nakamoto, Satoshi. ‘Bitcoin: A Peer-to-Peer Electronic Cash System’. Bitcoin.org. Accessed Apr 2017. https://bitcoin.org/bitcoin.pdf.