Trusted Cloud Service Assurance for Banking Outsourcing: a Blockchain and Prisoner's Game Based Approach

In this paper, we study the trust problem faced by banks in outsourcing cloud computing services. We propose a credit evaluation system based on blockchain technology and game theory. For the three roles of bank user side, cloud service provider side, smart contract module and trusted third party (TTP), the system adopts smart contracts to automate the task assignment, result verification and arbitration process, ensuring transparency and traceability of data processing. On the other hand, a game theory-based model ensures reasonable rewards and punishments, enabling cloud service providers to deliver high-quality services and prevent fraud. In addition, we provide logical details of the key pieces in the smart contract, which provides an efficient and trustworthy credit evaluation solution for the digital transformation of banks.