Talos provides WebAssembly verification in Lean

Verifying code at the WebAssembly level is a clever approach to language-agnostic formal verification, bypassing the complexity of source-level proofs. However, Lean's steep learning curve and the early stage of the Talos interpreter mean it is not yet ready for mainstream production workloads.

• –Unifies execution and verification in a single Lean 4 codebase, eliminating the risk of specification drift.
• –Operates directly on compiled Wasm binaries, making formal verification accessible to any language compiling to Wasm, including Rust, C++, and Go.
• –Leverages Lean 4's interactive theorem proving capabilities and weakest-precondition calculus to mathematically prove program safety and correctness.
• –Prioritizes mathematical reasoning and proof clarity over execution performance, which may limit its use in performance-critical environments.
• –Part of Cajal Technologies' broader strategy to build Tau, a proprietary binary reasoning and specification extraction tool.