With the increased access to the Internet of Things (IoT) technology and digital financial sectors, blockchain technology has received extensive attention in recent years.Nowadays, Cloud computing has several researchers based on blockchain technology for effectively provisioning security and privacy to the Cloud users; still, it lacks to stop the attacks of the outsiders. The integrated technology has to improve its research work for preventing attacks, including selfish mining attacks, block discarding attack and difficulty raising attack, eclipse attack, double spending attack, block withholding attack, and anonymity issues in blockchain Cloud.