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This work presents ContractChecker, a Blockchain-based security protocol forverifying the storage consistency between the mutually distrusting cloudprovider and clients. Unlike existing protocols, the ContractChecker uniquelydelegates log auditing to the Blockchain, and has the advantages in reducingclient cost and lowering requirements on client availability, lending itself tomodern scenarios with mobile and web clients.  The ContractChecker collects the logs from both clients and the cloud server,and verifies the consistency by cross-checking the logs. By this means, it doesnot only detects the attacks from malicious clients and server forging theirlogs, but also is able to mitigate those attacks and recover the system fromthem. In addition, we design new attacks against ContractChecker exploitingvarious limits in real Blockchain systems (e.g., write unavailability,Blockchain forks, contract race conditions). We analyze and harden the securityof ContractChecker protocols against the proposed new attacks.  For evaluating the cost, we build a functional prototype of theContractChecker on Ethereum/Solidity. By experiments on private and publicEthereum testnets, we extensively evaluate the cost of the ContractChecker incomparison with that of existing client-based log auditing works. The resultshows the ContractChecker can scale to hundreds of clients and save clientcosts by more than one order of magnitude.

Secure Consistency Verification for Untrusted Cloud Storage by Public Blockchains