# DeepMind's AlphaProof Code Agents Produce Lean Proofs That Signal's Compiled Encryption Code Meets Its Specification

Agent teams produced millions of lines of machine-checked proof in about four weeks against roughly 26,000 lines of human-written specification, and the checks correctly failed on two reintroduced bugs.

- Published: 2026-11-11T06:08:31.146Z
- Canonical: https://polylog.news/ai/2026-11-11/deepmind-s-alphaproof-code-agents-produce-lean-proofs-that-s
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Google DeepMind](https://deepmind.google/blog/introducing-alphaproof-code/), [Unite.AI](https://www.unite.ai/google-deepmind-uses-ai-agents-to-verify-signals-core-machine-code/), [AI Weekly](https://aiweekly.co/alerts/google-deepminds-alphaproof-code-formally-verifies-signal-protocol-guarantees)

Google DeepMind introduced AlphaProof Code on November 10. It is a multi-agent framework that writes proofs in the Lean theorem prover to verify security properties of software. The first target was Signal's core encryption. Unlike most ear…

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