Application of Smart Contracts in Engineering Audit Data Verification: Systematic Review and Future Research Directions
The difficulties in engineering audit data verification lie in the evidence gap among on-site facts, contract rules, measurement and payment, and responsibility attribution. Blockchain and smart contracts provide new governance interfaces for this gap, but existing research is scattered in adjacent fields such as construction contract management and Audit 4.0, and has not yet formed a comprehensive explanation for engineering audit. Based on the PRISMA approach, this paper searches and screens relevant literature, combines the evidence mapping method, and reconstructs the knowledge structure of this field around “input of facts – translation of rules – execution of contracts – anchoring of evidence – audit feedback”. The study shows that the role of smart contracts in engineering audit is not to replace audit judgments, but to embed verifiable items in the project process, converting engineering quantities into traceable audit events. The literature also reveals that the real bottleneck does not lie in the chain-based evidence storage, but in whether the facts can be trusted to enter the contract, whether the contract rules can accommodate the engineering context, and whether the contract execution results can be recognized by the system. Based on this, this paper proposes a hierarchical mechanism framework and future research agenda for engineering audit data verification, emphasizing trusted oracles, BIM-IoT-chain integration, and privacy protection verification as the main lines of subsequent research.