PRIVACY-FOCUSED REDACTABLE BLOCKCHAIN WITH RESTRICTED ACCESS IN DECENTRALIZED ECOSYSTEMS

Redactable blockchain, which provides decentralization, traceability, and transparency while permitting permitted changes to on-chain data, has become a promising technology in recent years. Despite their benefits, existing redactable blockchain systems are limited in their practical use by issues including significant communication overhead and data privacy breaches. This study presents PriChain, a fine-grained redactable blockchain technology for decentralized contexts that preserves privacy in order to address these problems. PriChain gives data owners the authority to manage who may access and alter their on-chain data, guaranteeing that redaction can only be carried out by authorized users while maintaining data confidentiality. Through the use of attributebased encryption with several authorities, PriChain guarantees resistance to unwanted cooperation or collusion and permits exact access control. When compared to traditional techniques, the framework dramatically lowers communication and storage overhead. PriChain is a reliable and useful option for blockchain applications that prioritize privacy as security analysis demonstrates that it is impervious to chosen-plaintext attacks.