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Cloud computing has come out as a key technology to deliver infrastructure and data service requirements at low cost and with minimal efforts and high level of scalability and hence have been highly implemented in various aspects of IT industry. A rapid growth in Cloud Computing adaption has been observed but, still, the information security concerns have not been fully countered. Information security concerns are still hindering the growth of Cloud Computing to some extents and need to be resolved. At the same time Blockchain has emerged as a key technology to provide security especially in aspects of integrity, authenticity and confidentiality. This paper reviews the various aspects of security in Blockchain and Cloud Computing and further analyses the application of Blockchain in Cloud Computing security.