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Byzantine Fault Tolerance (BFT) is one of the blockchain consensus algorithms mainly used in blockchain. Scalability has become the main issue due to an increase the number of users, as every user needs to participate in BFT algorithm. Therefore, improvement in scalability is essential in algorithm of BFT in blockchain. In this study, we propose a preprocessing method for a private blockchain where blockchain nodes continue to record data without consensus and the agent informs about situations that require consensus. In the first preprocessing, the agent checks the data uniformity of all the nodes. In the second preprocessing, the agent selects transactions that require consensus. The agent operates as an independent object from blockchain network and is activated by blockchain node. Santa Claus algorithm to Practical Byzantine Fault Tolerance (PBFT) consensus in private blockchain demonstrates an average 39% reduction in response time with the expansion of the nodes.

Santa Claus Algorithm: Agent-Based Consensus Preprocessing Method for Scalability Improvement in Private Blockchain Environment