A cross-chain electricity transaction scheme for multi-microgrid with user privacy protection and regulation

Multi-microgrid smart electricity market can facilitate energy complementarity between microgrids and improve the utilization rate of renewable energy. However, in the transaction payment between multiple blockchain-based microgrids, transaction data and transaction assets on different blockchains are not only difficult to interoperate, but also attackers can obtain private information such as the account addresses and transaction amount of electricity prosumers from the blockchain ledger. This allows attackers to infer the true identities of users, undermining the security and fairness of electricity transaction. To address these issues, a cross-chain electricity transaction scheme for multi-microgrid with user privacy protection and regulation is proposed. Firstly, Pedersen commitment is used to encrypt the transaction amount, and Signature of Knowledge is used to encrypt the electricity transaction payment message while hiding the true identities of the users, achieving anonymous payment. Secondly, the stealth address generation algorithm in the blockchain is improved, achieving unlinkability between users' real address and payment address, preventing inference attacks and enhancing address generation efficiency. Finally, relay chain technology is used to ensure the security of cross-chain electricity transaction payment between different microgrids. Theoretical analysis proves the scheme's unforgeability, anonymity, and traceability. Performance evaluation indicates that the scheme has low computational costs.