A Secure and Efficient Account Migration Protocol in Blockchain Sharding Systems

In sharding systems, account migration is viewed as an effective strategy to minimize the proportion of cross-shard transactions and optimize load balancing between shards. However, existing account migration schemes typically require locking the transactions of the target account, which leads to delayed transaction confirmations and reduced system effi-ciency. To address this challenge, our paper proposes a secure and efficient account migration protocol that utilizes a nonce mechanism to eliminate the need for locking operations on the target account, thereby mitigating the impact of migration on confirmation delays for related transactions. Furthermore, we introduce a failure handling mechanism to ensure the consistency and stability of the system. Finally, we assess the feasibility of our protocol and conduct relevant experimental validation.