Cloud computing is one of the important business models of modern information technology. It provides users with a variety of services (hardware, software) with minimal interaction and low cost. Security and privacy are the primary concerns of utilizing on cloud environment. The data storage and infrastructure authority in the cloud are offered by the third party. Sometimes sensitive data has the risk of being handed over to cloud service provider. Hence the user always expects useful secure data storage. Overcome those issues to propose a Lightweight Bcrypt Symmetric Key (LBSK) data encryption and decryption algorithm with key rotation technique. Different algorithms and blockchain methods are there in use for protecting the data. Encryption is one of the fascinating parts of data securing technology. For Secured cloud data audit, introduced an Aggregated authority certificate provider (AACP) with blockchain authentication, which reduces the burden of the data owner. In this proposed AACP which run on cloud server continuously and monitor the cloud user request. The Hyperledger blockchain proxy re-encryption is used to achieve higher security and privacy for the non-trusted provider. The Data encryption has been carried out all the way through the Blockchain algorithm and stored in the cloud. Security level is increased with public verification and performance aspects, for remote data verification without keeping the data locally. In this proposed method provides a better result compared to existing methods.