https://ztljudge.com/Zero-Trust Logic: a logic for checks on data you do not own, and a judge that says what a claim needs. Machine-checked in Lean 4 with an empty axiom list.https://ztljudge.com/about/https://ztljudge.com/about/Fri, 30 Oct 2026 12:00:00 +0000Who makes ZTL, how it is made with AI, and why every claim here comes with a way to check it.https://ztljudge.com/https://ztljudge.com/Fri, 30 Oct 2026 12:00:00 +0000A logic for checks on data you do not own, and a judge that says what a claim needs. Proofs checked in Lean 4 with an empty axiom list.https://ztljudge.com/tools/api/https://ztljudge.com/tools/api/Fri, 30 Oct 2026 12:00:00 +0000The ZTL judge as a public HTTP API and an MCP server for AI agents — no key, no sign-up.https://ztljudge.com/tools/code/https://ztljudge.com/tools/code/Fri, 30 Oct 2026 12:00:00 +0000Where the ZTL code and the Lean proofs live, and how to rerun them yourself.https://ztljudge.com/tools/engineer/https://ztljudge.com/tools/engineer/Fri, 30 Oct 2026 12:00:00 +0000ZTL Engineer checks an engineering promise — a pump, a solar kit — for every value the tolerances allow.https://ztljudge.com/tools/studio/https://ztljudge.com/tools/studio/Fri, 30 Oct 2026 12:00:00 +0000The ZTL studio in the browser — state a claim as a table of facts with their status, and the ZTL core judges it.https://ztljudge.com/ztl/judge/https://ztljudge.com/ztl/judge/Fri, 30 Oct 2026 12:00:00 +0000For one claim on dirty data, the judge reports three readings at once and combines them into one disposition.https://ztljudge.com/ztl/proved/https://ztljudge.com/ztl/proved/Fri, 30 Oct 2026 12:00:00 +0000What is proved in Lean, what is measured by scripts, what is published, and where ZTL stands among known logics.https://ztljudge.com/ztl/rule/https://ztljudge.com/ztl/rule/Fri, 30 Oct 2026 12:00:00 +0000One rule generates every ZTL connective: false whenever some reading of the arguments makes the classical connective false.