TRANSACTION AUDIT SYSTEM

Provided is a transaction audit system that ensures authenticity of data and allows performing an audit work in a short period at low cost. The transaction audit system of this disclosure includes a terminal that constitute a blockchain server, a database that stores master data including automated deployment rule data, and an audit engine. First transaction data is input to the audit engine by the terminal, the audit engine refers to the master data to generate second transaction data, and the first and the second transaction data are each decomposed into a data item and a value of the data item to generate first table information. The data item includes at least a data model name, a version number, an application name, a user name, and an operation date and time. A block for a blockchain is generated based on the first table information and recorded in the blockchain database by the terminal.