Blockchain technology for decentralized storage systems is a vibrant research area that investigates how blockchain can enhance the security, transparency, and trustworthiness of distributed data storage. Research papers in this domain explore blockchain-enabled decentralized storage frameworks such as IPFS, Filecoin, Storj, and Sia, which replace centralized cloud providers with peer-to-peer networks where data is encrypted, fragmented, and distributed across multiple nodes. Studies highlight blockchain’s role in ensuring data integrity, provenance, and access control through immutable ledgers and smart contracts. Recent works investigate incentive mechanisms for storage providers, reputation management, and verifiable storage proofs (e.g., Proof of Replication, Proof of SpaceTime) to guarantee reliable storage and retrieval. Challenges such as scalability, high storage costs on-chain, and latency are addressed through hybrid models that combine blockchain with off-chain and edge/fog storage solutions. Privacy-preserving approaches using homomorphic encryption, differential privacy, and zero-knowledge proofs are increasingly integrated to protect sensitive data while ensuring decentralized trust. Applications include healthcare record management, supply chain data sharing, IoT data storage, and multimedia content distribution, where reliability and user control over data are paramount. Overall, research in blockchain-based decentralized storage systems paves the way for secure, tamper-proof, and user-centric data management beyond traditional centralized cloud infrastructures.