Tridirectional Discriminating-Power Formal Verification of Smart Contract Reentrancy Defense Against Production-Deployed Solidity Source
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arXiv
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| Format: | Preprint |
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2026
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| author | Iskander, Ray |
| author_facet | Iskander, Ray |
| contents | We present the first machine-checked correctness proof of the OpenZeppelin reentrancy-guard pattern against a Lean 4 state-machine model of production-deployed Solidity source. All thirteen theorems are machine-checked with zero sorry, zero user-introduced axioms, and an axiom footprint bounded by [propext] (a standard mathlib4 axiom), gated under continuous integration.
Smart contract reentrancy has caused over US$500M in documented losses since 2016, with the DAO 2016 attack draining ~3.6M ETH and forcing the hard fork that split Ethereum. The OpenZeppelin ReentrancyGuard pattern is the de facto defense across production DeFi, yet no prior work has established its discriminating power: that the guard blocks attacks on vulnerable instances, preserves correct execution for non-attacking transactions, and distinguishes adjacent safe and vulnerable variants. Prior efforts formalized either guard correctness on toy contracts or attack feasibility on isolated instances - not both directions plus boundary cases against production source.
We verify three production instantiations - DAO 2016, Compound v2, and Aave V3 flashLoan - plus a minimal-diff mutant of Aave V3's flashLoan (flashLoanVulnerable) isolating one security-critical difference, via mutation testing. The tridirectional structure pairs (a) attack reproduction of the DAO 2016 pattern, (b) a correctness proof for Compound v2, and (c) a boundary-case proof distinguishing Aave V3's CEI-correct flashLoan from the mutant. A capstone meta-theorem composes the three under a no-retrofit discipline, demonstrated at the first cross-protocol stress test (Compound v2 to Aave V3); broader-family portability is future work.
Full Lean 4 source, CI config and reproduction commands are at https://github.com/rayiskander2406/qanary-contracts, reproducible at v1.6-phase7-closure (substrate: v1.3-layer6-closure). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2606_01794 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tridirectional Discriminating-Power Formal Verification of Smart Contract Reentrancy Defense Against Production-Deployed Solidity Source Iskander, Ray Cryptography and Security Logic in Computer Science Programming Languages 68N30, 68Q60, 94A60 D.2.4; F.3.1; K.6.5 We present the first machine-checked correctness proof of the OpenZeppelin reentrancy-guard pattern against a Lean 4 state-machine model of production-deployed Solidity source. All thirteen theorems are machine-checked with zero sorry, zero user-introduced axioms, and an axiom footprint bounded by [propext] (a standard mathlib4 axiom), gated under continuous integration. Smart contract reentrancy has caused over US$500M in documented losses since 2016, with the DAO 2016 attack draining ~3.6M ETH and forcing the hard fork that split Ethereum. The OpenZeppelin ReentrancyGuard pattern is the de facto defense across production DeFi, yet no prior work has established its discriminating power: that the guard blocks attacks on vulnerable instances, preserves correct execution for non-attacking transactions, and distinguishes adjacent safe and vulnerable variants. Prior efforts formalized either guard correctness on toy contracts or attack feasibility on isolated instances - not both directions plus boundary cases against production source. We verify three production instantiations - DAO 2016, Compound v2, and Aave V3 flashLoan - plus a minimal-diff mutant of Aave V3's flashLoan (flashLoanVulnerable) isolating one security-critical difference, via mutation testing. The tridirectional structure pairs (a) attack reproduction of the DAO 2016 pattern, (b) a correctness proof for Compound v2, and (c) a boundary-case proof distinguishing Aave V3's CEI-correct flashLoan from the mutant. A capstone meta-theorem composes the three under a no-retrofit discipline, demonstrated at the first cross-protocol stress test (Compound v2 to Aave V3); broader-family portability is future work. Full Lean 4 source, CI config and reproduction commands are at https://github.com/rayiskander2406/qanary-contracts, reproducible at v1.6-phase7-closure (substrate: v1.3-layer6-closure). |
| title | Tridirectional Discriminating-Power Formal Verification of Smart Contract Reentrancy Defense Against Production-Deployed Solidity Source |
| topic | Cryptography and Security Logic in Computer Science Programming Languages 68N30, 68Q60, 94A60 D.2.4; F.3.1; K.6.5 |
| url | https://arxiv.org/abs/2606.01794 |