Securing data today is a major priority since data can easily be used or accessed by unwanted parties. Because digital information storage and sharing are on the rise, there is a greater requirement for strong protection that allows access to information exclusively to authorized parties. Distributing data across decentralized nodes reduces single points of failure and prevents unauthorized modifications. The use of Merkle trees ensures that data in such systems is verified efficiently since any change in the data can be detected by looking at the root hash. NFTs play a crucial role in digital asset management and access control. NFTs help prove who the rightful owner of a certain data asset is and exclude those without permission from viewing it. Together, these technologies enhance data integrity, improve traceability, and simplify user activity logging. This paper discusses the latest innovations in decentralized data systems that rely on blockchain, cryptographic hash functions, and NFTs for security, openness, and tamper-proofness in storing information online.