Cloud computing has attracted wide attention because it can provide data storage and
computation to us. However, when the users outsource the data to the cloud server, the users
lose control over the data, so the data auditing is very important to protect users’ data. To
reduce computation and communication costs of the users, the existing schemes utilized a
trusted third party (TPA) to conduct verification on behalf of users. However, TPA is a
centralized party, which is vulnerable to external attacks and internal faults. In this paper, we
present a decentralized public auditing scheme for cloud storage based on blockchain, which
improves the reliability and stability of auditing results. In the proposed scheme, the cloud
service providers work together to perform data verification without TPA. Finally, the security
analysis shows that the scheme can resist a variety of attacks, and the experimental results
demonstrate that the proposed scheme has enhanced security and reliability.