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arXiv · 1812.08829

Formal Specification and Verification of Smart Contracts for Azure Blockchain

Yuepeng Wang·Shuvendu K. Lahiri·Shuo Chen·Rong Pan·Isil Dillig·Cody Born·Immad Naseer
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Abstract

Ensuring correctness of smart contracts is paramount to ensuring trust in blockchain-based systems. This paper studies the safety and security of smart contracts in the \emph{Azure Blockchain Workbench}, an enterprise Blockchain-as-a-Service offering from Microsoft. As part of this study, we formalize \emph{semantic conformance} of smart contracts against a state machine model with access-control policy and develop a highly-automated formal verifier for Solidity that can produce proofs as well as counterexamples. We have applied our verifier {\sc VeriSol} to analyze {\it all} contracts shipped with the Azure Blockchain Workbench, which includes application samples as well as a governance contract for Proof of Authority (PoA). We have found previously unknown bugs in these published smart contracts. After fixing these bugs, {\sc VeriSol} was able to successfully perform full verification for all of these contracts.

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Yuepeng Wang, Shuvendu K. Lahiri, Shuo Chen, Rong Pan, Isil Dillig, Cody Born, Immad Naseer. 2019-04-29. Formal Specification and Verification of Smart Contracts for Azure Blockchain. https://arxiv.org/abs/1812.08829

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