This study explores the transformative impact of blockchain technology on data integrity and security in digital environments. The research assesses data integrity metrics across prominent blockchain networks, including Bitcoin, Ethereum, and Hyperledger Fabric, revealing nuanced differences in immutability and reliability. The security analysis focuses on cryptographic strength and resistance to unauthorized access, highlighting the outstanding security features of Hyperledger Fabric and Bitcoin, while Ethereum exhibits moderate security levels. The study underscores the importance of selecting a blockchain platform aligned with specific use cases, with Hyperledger Fabric and Bitcoin being strong contenders for high-integrity and robust security applications, and Ethereum offering a reliable but moderate alternative. The findings provide valuable insights for practitioners and researchers, guiding the strategic selection of blockchain platforms to harness their transformative potential in diverse digital environments.This study explores the transformative impact of blockchain technology on data integrity and security in digital environments. The research assesses data integrity metrics across prominent blockchain networks, including Bitcoin, Ethereum, and Hyperledger Fabric, revealing nuanced differences in immutability and reliability. The security analysis focuses on cryptographic strength and resistance to unauthorized access, highlighting the outstanding security features of Hyperledger Fabric and Bitcoin, while Ethereum exhibits moderate security levels. The study underscores the importance of selecting a blockchain platform aligned with specific use cases, with Hyperledger Fabric and Bitcoin being strong contenders for high-integrity and robust security applications, and Ethereum offering a reliable but moderate alternative. The findings provide valuable insights for practitioners and researchers, guiding the strategic selection of blockchain platforms to harness their transformative potential in diverse digital environments.