In China, supply chain finance is still in infancy. However, it is the problems of information sharing, trust transfer, and risk management that have been making it difficult to meet the financing needs of small- and medium-sized enterprises (SMEs) in supply chain. The emerging blockchain technology, with its unique decentralization, traceability, and other characteristics, has found a digital solution for traditional supply chain finance. Although blockchain has attracted widespread attention and there are more general descriptions of blockchain application areas, there are few researches on the impact mechanisms of blockchain in-depth. Especially in the field of supply chain finance, there is little research on optimal incentive contract in online supply chain finance empowered by blockchain technology. Therefore, this paper explores the influence of blockchain technology maturity on participants, and thus finds the optimal incentive contract in online supply chain empowered by blockchain technology. Because of the mastery of blockchain technology, platforms believe they are well protected against risk and may behave irrationally. Therefore, this paper considers the overconfident behavior of blockchain supply chain finance platform in actual operation, and then applies the principal-agent model and incentive theory to design the incentive mechanism between platforms, banks, and central banks. Finally, numerical analyses show that overconfident behavior and the maturity of blockchain technology have an impact on the optimal decision for the whole supply chain.
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