To enhance the integrity and security of cloud data storage， a data storage scheme based on hybrid algorithm blockchain and a decentralized framework integrating identity authentication and privacy protection were proposed in Wireless Sensor Network （WSN）. Firstly， the collected information was transmitted to the base station by the cluster heads， and all the key parameters were recorded on the distributed blockchain and transmitted to the cloud storage by the base station. Then， in order to obtain a higher security level， the 160-bit key of Elliptic Curve Cryptography （ECC） and the 128-bit key of Advanced Encryption Standard （AES） were combined， and the key pairs were exchanged between the cloud storage layers. The proposed blockchain is based on a hybrid algorithm and combined with an identity verification scheme， which can well ensure the secure storage of cloud data， thus achieving excellent security. In addition， malicious nodes were able to be directly removed from the blockchain and also their authentication was able to be revoked through the base stations. And this operation is convenient and fast. Simulation results show that compared with schemes of decentralized Blockchain Information Management （BIM） scheme， secure localization algorithm based on trust and Decentralized Blockchain Evaluation （DBE） and Key Derivation Encryption and Data Analysis （KDE-DA） management scheme， the proposed scheme has some advantages in delay， throughput and computational overhead.