Proving safety of Tendermint consensus with Apalache and AI

Update (2026-07-28): Add Lean 4 proofs This text is artisanally typed using Das Keyboard, with occasional suggestions by Copilot (most of them ignored anyways). The figures are generated with ChatGPT 5.5. If you read my previous blog post , you know that I was impressed by the ability of the frontier AI tools to write complete proofs of safety for the Ben-Or's consensus using Lean 4 and TLAPS. Not…