When cloud services are combined, transactions are regulated by binding contracts specifying obligations of the parties. Contract-regulated cloud is a new class of cloud computing systems. Concerning contract-regulated cloud service compositions, a significant challenge is how to efficiently ensure contract-regulated reliable execution without repeating the proof. This paper describes GPTS (a generic proof approach based on true-situation) method for efficiently and effectively verifying the properties of contract-regulated cloud service composition. We model cloud service behaviours and the contracts governing them as generic specification to reduce the need for proof. We propose the definition of true-situation based on the contracts and PATSS (proof in all true-situations simultaneously) algorithm used to verify completeness of generic specification's properties with more efficiency. Furthermore, a case study is provided to illustrate the proposed method.
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