Abstract This paper presents detailed information about blockchain technology about how blockchain technology is applied for cloud security. Blockchain is one of the novels and ever breaking technology used for high security, which has been used in high-level government applications. In this paper, to tighten the cloud security, the blockchain security model is implemented and integrated with the cloud application. Thus, the healthcare application-based cloud environment is considered as the base application and experiment blockchain algorithm. From the obtained and compared results, it has been found that the blockchain security is highly suitable for cloud security and performs well in securing data during persistence and transmission.