diff --git a/.github/workflows/rh-run10bzec-bezout-two-lift.yml b/.github/workflows/rh-run10bzec-bezout-two-lift.yml
new file mode 100644
index 000000000..f758c50a7
--- /dev/null
+++ b/.github/workflows/rh-run10bzec-bezout-two-lift.yml
@@ -0,0 +1,78 @@
+name: RH Run10bzEC Bezout two-lift
+
+on:
+  push:
+    branches:
+      - verification/rh-run10bzec-bezout-two-lift-20260819
+    paths:
+      - verification/rh-run10bzec-bezout-two-lift/*.lean
+      - .github/workflows/rh-run10bzec-bezout-two-lift.yml
+  pull_request:
+    paths:
+      - verification/rh-run10bzec-bezout-two-lift/*.lean
+      - .github/workflows/rh-run10bzec-bezout-two-lift.yml
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    runs-on: ubuntu-22.04
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v4
+      - name: Verify flattened Lean theorem source
+        shell: bash
+        run: |
+          set -euo pipefail
+          SRC=verification/rh-run10bzec-bezout-two-lift/Run10bzecBezoutTwoLiftParameterization.lean
+          if grep -nE '\b(sorry|admit|sorryAx|axiom|opaque|unsafe|native_decide|Lean\.ofReduceBool)\b' "$SRC"; then exit 1; fi
+          SRC="$SRC" python3 - <<'PY'
+          import hashlib, json, os, pathlib, urllib.request
+          path = pathlib.Path(os.environ['SRC'])
+          source = path.read_text()
+          payload = json.dumps({
+            'content': source,
+            'environment': 'lean-4.30.0',
+            'ignore_imports': True,
+            'mathlib_options': False,
+            'timeout_seconds': 900,
+          }).encode()
+          req = urllib.request.Request(
+            'https://axle.axiommath.ai/api/v1/check',
+            data=payload,
+            headers={'Content-Type': 'application/json'},
+            method='POST',
+          )
+          with urllib.request.urlopen(req, timeout=960) as response:
+            result = json.load(response)
+          receipt = {
+            'source_path': str(path),
+            'source_sha256': hashlib.sha256(source.encode()).hexdigest(),
+            'axle_environment': 'lean-4.30.0',
+            'axle_result': result,
+          }
+          pathlib.Path('/tmp/rh-run10bzec-axle-receipt.json').write_text(json.dumps(receipt, indent=2))
+          print(json.dumps(receipt, indent=2))
+          lean = result.get('lean_messages', {})
+          tool = result.get('tool_messages', {})
+          bad = (
+            not result.get('okay')
+            or bool(result.get('failed_declarations', []))
+            or bool(lean.get('errors', []))
+            or bool(lean.get('warnings', []))
+            or bool(tool.get('errors', []))
+            or bool(tool.get('warnings', []))
+            or 'sorryAx' in json.dumps(result)
+          )
+          if bad:
+            raise SystemExit(1)
+          PY
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: rh-run10bzec-bezout-two-lift-axle-receipt
+          if-no-files-found: warn
+          retention-days: 30
+          path: /tmp/rh-run10bzec-axle-receipt.json
diff --git a/verification/rh-run10bzec-bezout-two-lift/Run10bzecBezoutTwoLiftParameterization.lean b/verification/rh-run10bzec-bezout-two-lift/Run10bzecBezoutTwoLiftParameterization.lean
new file mode 100644
index 000000000..3a248b851
--- /dev/null
+++ b/verification/rh-run10bzec-bezout-two-lift/Run10bzecBezoutTwoLiftParameterization.lean
@@ -0,0 +1,133 @@
+import Mathlib
+
+/-!
+# RH Run10bzEC — exact Bezout two-lift parameterization
+
+Finite integer-algebra core only.  Given the two reduced band equations and an
+explicit Bezout certificate, the four integer variables lie on two affine
+integer lines and the 2x2 determinant is exactly the Poisson frequency times
+the sum of the two lift indices.
+
+This file does not formalize Heath--Brown identities, dispersion estimates,
+Suzuki's criterion, zeta, or RH.
+-/
+
+namespace Millennium.RH.Run10bzecBezoutTwoLiftParameterization
+
+/-- Every solution of the two reduced band equations has an exact two-lift
+Bezout parameterization, and the determinant slope is the sum of those lifts. -/
+theorem bezout_two_lift_parameterization
+    (A B l₁ l₂ a b h x y : ℤ)
+    (h₁ : A * b - l₁ * a = h)
+    (h₂ : B * a - l₂ * b = h)
+    (hbez : x * a + y * b = 1) :
+    ∃ t u : ℤ,
+      t = x * A + y * l₁ ∧
+      u = y * B + x * l₂ ∧
+      A = h * y + a * t ∧
+      l₁ = b * t - h * x ∧
+      B = h * x + b * u ∧
+      l₂ = a * u - h * y ∧
+      A * B - l₁ * l₂ = h * (t + u) := by
+  let t : ℤ := x * A + y * l₁
+  let u : ℤ := y * B + x * l₂
+  have hA : A = h * y + a * t := by
+    calc
+      A = A * (x * a + y * b) := by rw [hbez]; ring
+      _ = (A * b - l₁ * a) * y + a * (x * A + y * l₁) := by ring
+      _ = h * y + a * t := by rw [h₁]
+  have hl₁ : l₁ = b * t - h * x := by
+    calc
+      l₁ = l₁ * (x * a + y * b) := by rw [hbez]; ring
+      _ = b * (x * A + y * l₁) - (A * b - l₁ * a) * x := by ring
+      _ = b * t - h * x := by rw [h₁]
+  have hB : B = h * x + b * u := by
+    calc
+      B = B * (x * a + y * b) := by rw [hbez]; ring
+      _ = (B * a - l₂ * b) * x + b * (y * B + x * l₂) := by ring
+      _ = h * x + b * u := by rw [h₂]
+  have hl₂ : l₂ = a * u - h * y := by
+    calc
+      l₂ = l₂ * (x * a + y * b) := by rw [hbez]; ring
+      _ = a * (y * B + x * l₂) - (B * a - l₂ * b) * y := by ring
+      _ = a * u - h * y := by rw [h₂]
+  have hD : A * B - l₁ * l₂ = h * (t + u) := by
+    calc
+      A * B - l₁ * l₂ =
+          (h * y + a * t) * (h * x + b * u) -
+            (b * t - h * x) * (a * u - h * y) := by
+              rw [hA, hl₁, hB, hl₂]
+      _ = h * (t + u) * (x * a + y * b) := by ring
+      _ = h * (t + u) := by rw [hbez]; ring
+  exact ⟨t, u, rfl, rfl, hA, hl₁, hB, hl₂, hD⟩
+
+/-- Converse: arbitrary lift indices give a solution of the two band equations. -/
+theorem two_lift_formulas_satisfy_system
+    (a b h x y t u : ℤ)
+    (hbez : x * a + y * b = 1) :
+    let A : ℤ := h * y + a * t
+    let l₁ : ℤ := b * t - h * x
+    let B : ℤ := h * x + b * u
+    let l₂ : ℤ := a * u - h * y
+    A * b - l₁ * a = h ∧
+      B * a - l₂ * b = h ∧
+      A * B - l₁ * l₂ = h * (t + u) := by
+  dsimp
+  constructor
+  · calc
+      (h * y + a * t) * b - (b * t - h * x) * a =
+          h * (x * a + y * b) := by ring
+      _ = h := by rw [hbez]; ring
+  constructor
+  · calc
+      (h * x + b * u) * a - (a * u - h * y) * b =
+          h * (x * a + y * b) := by ring
+      _ = h := by rw [hbez]; ring
+  · calc
+      (h * y + a * t) * (h * x + b * u) -
+          (b * t - h * x) * (a * u - h * y) =
+            h * (t + u) * (x * a + y * b) := by ring
+      _ = h * (t + u) := by rw [hbez]; ring
+
+/-- The lift indices are exactly recovered from the affine formulas. -/
+theorem recover_lift_indices
+    (A B l₁ l₂ a b h x y t u : ℤ)
+    (hbez : x * a + y * b = 1)
+    (hA : A = h * y + a * t)
+    (hl₁ : l₁ = b * t - h * x)
+    (hB : B = h * x + b * u)
+    (hl₂ : l₂ = a * u - h * y) :
+    x * A + y * l₁ = t ∧ y * B + x * l₂ = u := by
+  constructor
+  · calc
+      x * A + y * l₁ =
+          x * (h * y + a * t) + y * (b * t - h * x) := by rw [hA, hl₁]
+      _ = t * (x * a + y * b) := by ring
+      _ = t := by rw [hbez]; ring
+  · calc
+      y * B + x * l₂ =
+          y * (h * x + b * u) + x * (a * u - h * y) := by rw [hB, hl₂]
+      _ = u * (x * a + y * b) := by ring
+      _ = u := by rw [hbez]; ring
+
+/-- At nonzero Poisson frequency, determinant zero is exactly cancellation of
+the two lift indices. -/
+theorem zero_determinant_iff_lifts_cancel
+    (A B l₁ l₂ h t u : ℤ)
+    (hh : h ≠ 0)
+    (hD : A * B - l₁ * l₂ = h * (t + u)) :
+    A * B - l₁ * l₂ = 0 ↔ t + u = 0 := by
+  constructor
+  · intro hz
+    have hzero : h * (t + u) = 0 := by rw [← hD, hz]
+    exact (mul_eq_zero.mp hzero).resolve_left hh
+  · intro htu
+    rw [hD, htu]
+    ring
+
+#print axioms bezout_two_lift_parameterization
+#print axioms two_lift_formulas_satisfy_system
+#print axioms recover_lift_indices
+#print axioms zero_determinant_iff_lifts_cancel
+
+end Millennium.RH.Run10bzecBezoutTwoLiftParameterization