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Round-4 verdicts: Claude reviewer — nothing blocks the freeze, no remaining findings; GPT-5.6 — approve after minor documentation fixes, attestation scoped to the mechanized model. This round is those fixes; no Lean surface changed. - 218/59 → 222/61 everywhere, and STRUCTURALLY: check.sh Phase 3c asserts the audit counts (STATEMENT-MAP + README vs allowlist/CONES) and the four fidelity pins (STATEMENT-MAP vs run_fidelity.py constants) on every run — stale-count drift is a red button now (R4-1, third recurrence of the class). - Gap 14 reworded to evidence-vs-inference (the invariant "is assumed", not "transfers"), witnesses cited (paper §5.3/§5.4; pacta sthstore.py/logclient.py — outside the fidelity target). New gap 15: deployment refinement invariant unmechanized (GPT's principal finding, split out because it carries the deployed-soundness claim). - Runbook: A1 marked done (both approvals on SD); B2 gains the REQUIRED scoped attestation wording (GPT §11) as a gate condition — entry 13 cannot claim "deployed verifier formally verified". - run_bare.sh fail-closes on Lean version AND commit (rejection path tested with a fake toolchain: FATAL, exit 1). - Harness: "consistency baseline family" line (GPT §8); gap 14 says "fixed offsets n−1/n+1/n+7" (R4-5). - RESPONSE round 5, incl. refutation of GPT §7 (the target tarball demonstrably contains MANIFEST.sha256 + TARGET-PROVENANCE.md; the round-5 kit also ships both unpacked as a courtesy). check.sh exit 0 ATTESTATION GREEN (Phases 0-4 incl. new 3c); selftest exit 0, 9/9 + control. Live LTL untouched (12 leaves, bcd15f9d…). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
57 lines
4 KiB
Markdown
57 lines
4 KiB
Markdown
# ltl-accumulator-verified
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Lean 4 mechanization of the security analysis (§6) of the paper
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"The Lean Transparency Log" (https://ltl.zkdefi.org/paper): the Merkle
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accumulator's own correctness and soundness theorems, kernel-checked, in
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the same discipline as the four `*-ed25519-verified` subject corpora.
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## Status: **FROZEN for external review** (corpus complete)
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All paper-§10 mechanization targets are kernel-checked; the audit surface
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is defined and green (`verification/check.sh`, exit 0). See
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[STATEMENT-MAP.md](STATEMENT-MAP.md) for the paper↔Lean review surface and
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[KNOWN-GAPS.md](KNOWN-GAPS.md) for the honest scope ledger.
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Revised across four external review rounds (GPT-5.6 + a second Claude,
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adversarial; zero broken theorems in any round; both approved after
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round 4). The audit surface is an environment-derived inventory
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(`Proofs/Inventory.lean` + pinned allowlist — 222 constants,
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61 human-reviewed cones, self-tested by `selftest_audit.sh`); the review
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kit is push-button reproducible (`run_bare.sh`, self-contained fidelity
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target); `acceptIncl`/`acceptCons_sound` route the theorems through the
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named acceptance predicates; fidelity = agreement over pinned families
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(230,271 + 230,016 baseline; 73,573 lied-size boundary cases with
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3,867 expected one-sided divergences — KNOWN-GAPS gaps 14/15, not
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extensional equality). Doc counts are asserted by check.sh Phase 3c.
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The finished certificates' attestation into the LTL is a separate,
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explicitly-authorized operator decision, scoped per the runbook.
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| layer | content | status |
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|---|---|---|
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| L1 | bytes, hleaf/hnode, domain separation (Lemma 1) | **done** (domsep: axiom-free) |
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| L2 | MTH, Root, ConsRec definitions + termination | **done** (cones: propext, LTLAcc.sha256, Quot.sound) |
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| L3 | inclusion completeness (Theorem 1) + named acceptance `acceptIncl` | **done** (incl_complete: propext, Classical.choice, LTLAcc.sha256, Quot.sound) |
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| L4 | frontier binding content (Lemma 2) | **done as specializations** — inlined in the extractor walk (`extractIncl`), whole-tree (`extractMTH`), ConsRec (`consRecBinding`); the standalone `Root` receipt-uniqueness instance was deleted with the vacuous `root_binding` in S3.5 and deliberately NOT restored (optional, unused — KNOWN-GAPS gap 3) |
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| L5 | inclusion soundness = EXPLICIT extractor `extractIncl` (Theorem 2) | **done, non-vacuous** |
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| L6a | descent extractor `extractMTH` (Theorem 3 step 3 = Lemma 2, whole-tree instance) | **done, non-vacuous** |
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| L6b | Theorem 3 (consistency soundness): `consRecBinding` (steps 1–2) + `extractCons`/`extractCons_correct` (+ `_paper` at the paper's exact quantifiers; `acceptCons_sound` routes it through the named `acceptCons` predicate, size bound derived from acceptance via `consRec_some_le`) | **done, non-vacuous** |
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| L6c | pin-store state machine safety (Proposition 1): `pinAccept_monotone`, `pin_prefix_correct`, `fork_distinct` | **done, non-vacuous** (per-step; multi-step chain = gap 7) |
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## Discipline (identical to the subject corpora)
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- `verification/Proofs/` contains ZERO `axiom` declarations; the single
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sanctioned axiom site is `verification/gen/` — here, one opaque
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function: SHA-256. The theorems are constructive collision extractors,
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so collision resistance is never assumed, only interpreted.
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- `verification/check.sh` is THE button: compiles every file through
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`lean-guard` (memory cap, core pinning, timeout, single-flight lock)
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and axiom-audits every certificate against its documented exact cone.
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- Reviewers without the operator toolchain: `verification/run_bare.sh`
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compiles, axiom-audits, and inventory-gates the corpus with a plain
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public `lean` (version pinned in `verification/lean-toolchain`); the
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operator path is overridable via `AENEAS_ENV`.
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- Expected boundary: `propext, Classical.choice, Quot.sound` plus
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`LTLAcc.sha256` for hash-touching certificates — documented per
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certificate in `check.sh`, audited both directions.
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The finished certificates are destined for the LTL itself as attestation
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leaves: the log carrying kernel-checked proofs of its own machinery.
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