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Secure deduplication techniques have been wildly used in cloud storage to save both disk space and network bandwidth. However, traditional schemes store only one copy in cloud which raises problems with data reliability. Meanwhile, the existence of any third party, which is adopted by many deduplication schemes, will bring the risk of being single-pointed. In order to solve the above problem, this paper proposes a deduplication scheme which distributes files to multi servers and records storage informations on blockchain. We present smart contract based protocols without the participants of the central authorities to provide secure deduplication. With safety analysis, we demonstrate that our deduplication scheme is secure and reliable under the definitions specified in the proposed security model with acceptable performance through simulation experiments.