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As a trusted middleware connecting the blockchain and the real world, theblockchain oracle can obtain trusted real-time price information for financialapplications such as payment and settlement, and asset valuation on theblockchain. However, the current oracle schemes face the dilemma of securityand service quality in the process of node selection, and the implicit interestrelationship in financial applications leads to a significant conflict ofinterest between the task publisher and the executor, which reduces theparticipation enthusiasm of both parties and system security. Therefore, thispaper proposes an anonymous node selection scheme that anonymously selectsnodes with high reputations to participate in tasks to ensure the security andservice quality of nodes. Then, this paper also details the interestrequirements and behavioral motives of all parties in the payment settlementand asset valuation scenarios. Under the assumption of rational participants,an incentive mechanism based on the Stackelberg game is proposed. It canachieve equilibrium under the pursuit of the interests of task publishers andexecutors, thereby ensuring the interests of all types of users and improvingthe enthusiasm of participation. Finally, we verify the security of theproposed scheme through security analysis. The experimental results show thatthe proposed scheme can reduce the variance of obtaining price data by about55\% while ensuring security, and meeting the interests of all parties.

A Data Middleware for Obtaining Trusted Price Data for Blockchain