diff --git a/website/deploy/README.md b/website/deploy/README.md
index 5967691..8da7a21 100644
--- a/website/deploy/README.md
+++ b/website/deploy/README.md
@@ -37,7 +37,8 @@ Before using these templates:
   from the local repo to stage the current committed `website/` tree into a VPS
   temp checkout, boot it on the host-safe staging port, verify the real
   `/health`, `/api/auth/health`, `/api/releases/manifest`, and root shell
-  surfaces, and clean the temp lane back up on success; add
+  surfaces, fail if the live anonymous release-manifest drifted from the
+  rendered launch authority, and clean the temp lane back up on success; add
   `--archive-source worktree` when the proof should use the in-progress local
   worktree rather than committed `HEAD`
 - after staging proof or for direct root-owned rollout, you can now also run
diff --git a/website/scripts/runtime-readiness-lib.mjs b/website/scripts/runtime-readiness-lib.mjs
index 4307ea7..04fe088 100644
--- a/website/scripts/runtime-readiness-lib.mjs
+++ b/website/scripts/runtime-readiness-lib.mjs
@@ -69,6 +69,27 @@ function isHttpsUrl(url) {
   return url?.protocol === 'https:'
 }
 
+const RELEASE_MANIFEST_PLATFORM_EXPECTATIONS = [
+  {
+    platformKey: 'windows',
+    envPrefix: 'WINDOWS',
+    legacyFrontendUrlKey: 'VITE_WINDOWS_DOWNLOAD_URL',
+    label: 'Windows',
+  },
+  {
+    platformKey: 'macos',
+    envPrefix: 'MACOS',
+    legacyFrontendUrlKey: 'VITE_MAC_DOWNLOAD_URL',
+    label: 'macOS',
+  },
+  {
+    platformKey: 'linux',
+    envPrefix: 'LINUX',
+    legacyFrontendUrlKey: 'VITE_LINUX_DOWNLOAD_URL',
+    label: 'Linux',
+  },
+]
+
 function createBucket() {
   return {
     failures: [],
@@ -202,6 +223,189 @@ function resolveEnvCandidate(frontendEnv, serverEnv, frontendKey, serverKey) {
   }
 }
 
+function readEnvFirst(frontendEnv, serverEnv, frontendKey, serverKey = frontendKey) {
+  return normalizeTrimmed(frontendEnv[frontendKey] || serverEnv[serverKey])
+}
+
+function readServerOnly(serverEnv, key) {
+  return normalizeTrimmed(serverEnv[key])
+}
+
+function readOptionalInteger(serverEnv, key) {
+  const rawValue = readServerOnly(serverEnv, key)
+  if (!rawValue) {
+    return null
+  }
+
+  const value = Number(rawValue)
+  if (!Number.isFinite(value) || value < 0) {
+    return null
+  }
+
+  return Math.trunc(value)
+}
+
+function formatRuntimeComparableValue(value) {
+  if (value === null || value === undefined) {
+    return '(blank)'
+  }
+
+  if (typeof value === 'boolean') {
+    return value ? 'true' : 'false'
+  }
+
+  if (typeof value === 'number') {
+    return Number.isFinite(value) ? String(value) : '(blank)'
+  }
+
+  const trimmed = normalizeTrimmed(value)
+  return trimmed || '(blank)'
+}
+
+function compareRuntimeComparableValues(expected, actual) {
+  return formatRuntimeComparableValue(expected) === formatRuntimeComparableValue(actual)
+}
+
+function pushLiveManifestDriftFailure(failures, label, expected, actual) {
+  failures.push(
+    `${label} drifted from configured launch authority (expected ${formatRuntimeComparableValue(expected)}, got ${formatRuntimeComparableValue(actual)}).`,
+  )
+}
+
+function appendLiveReleaseManifestDriftChecks({
+  failures,
+  frontendEnv,
+  serverEnv,
+  liveReleaseManifest,
+}) {
+  const manifest = liveReleaseManifest?.manifest
+  if (!manifest) {
+    return
+  }
+
+  const topLevelExpectations = [
+    {
+      label: 'Live release manifest support email',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_SUPPORT_EMAIL', 'SUPPORT_EMAIL') || 'hello@hypertwist.app',
+      actual: manifest.support_email,
+    },
+    {
+      label: 'Live release manifest public docs URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_PUBLIC_DOCS_URL', 'PUBLIC_DOCS_URL'),
+      actual: manifest.public_docs_url,
+    },
+    {
+      label: 'Live release manifest release-notes URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_RELEASE_NOTES_URL', 'RELEASE_NOTES_URL'),
+      actual: manifest.release_notes_url,
+    },
+    {
+      label: 'Live release manifest corresponding-source URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_MPL_SOURCE_URL', 'MPL_SOURCE_URL'),
+      actual: manifest.corresponding_source_url,
+    },
+    {
+      label: 'Live release manifest open-source repo URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_OPEN_SOURCE_REPO_URL', 'OPEN_SOURCE_REPO_URL'),
+      actual: manifest.open_source_repo_url,
+    },
+    {
+      label: 'Live release manifest operator checkout URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_PADDLE_CHECKOUT_URL_OPERATOR'),
+      actual: manifest.commerce?.operator_checkout_url,
+    },
+    {
+      label: 'Live release manifest studio checkout URL',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_PADDLE_CHECKOUT_URL_STUDIO'),
+      actual: manifest.commerce?.studio_checkout_url,
+    },
+    {
+      label: 'Live release manifest operator price string',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_PLAN_PRICE_OPERATOR') || 'Launch pricing via Paddle',
+      actual: manifest.commerce?.plan_price_operator,
+    },
+    {
+      label: 'Live release manifest studio price string',
+      expected: readEnvFirst(frontendEnv, serverEnv, 'VITE_PLAN_PRICE_STUDIO') || 'Contact for launch readiness',
+      actual: manifest.commerce?.plan_price_studio,
+    },
+  ]
+
+  for (const expectation of topLevelExpectations) {
+    if (!compareRuntimeComparableValues(expectation.expected, expectation.actual)) {
+      pushLiveManifestDriftFailure(failures, expectation.label, expectation.expected, expectation.actual)
+    }
+  }
+
+  const platforms = Array.isArray(manifest.platforms) ? manifest.platforms : []
+  const globalVersion = readServerOnly(serverEnv, 'RELEASE_MANIFEST_VERSION')
+  const globalChannel = readServerOnly(serverEnv, 'RELEASE_MANIFEST_CHANNEL') || 'preview'
+
+  for (const definition of RELEASE_MANIFEST_PLATFORM_EXPECTATIONS) {
+    const platform = platforms.find((entry) => entry?.platform_key === definition.platformKey)
+    if (!platform) {
+      failures.push(`Live release manifest is missing the ${definition.label} platform entry.`)
+      continue
+    }
+
+    const configuredCandidate = resolveEnvCandidate(
+      frontendEnv,
+      serverEnv,
+      definition.legacyFrontendUrlKey,
+      `${definition.envPrefix}_DOWNLOAD_URL`,
+    )
+    const expectedConfigured = Boolean(normalizeTrimmed(configuredCandidate.value))
+    const platformExpectations = [
+      {
+        label: `Live release manifest ${definition.label} configured posture`,
+        expected: expectedConfigured,
+        actual: platform.configured === true,
+      },
+      {
+        label: `Live release manifest ${definition.label} release channel`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_CHANNEL`) || globalChannel,
+        actual: platform.channel,
+      },
+      {
+        label: `Live release manifest ${definition.label} release version`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_VERSION`) || globalVersion,
+        actual: platform.version,
+      },
+      {
+        label: `Live release manifest ${definition.label} release build ID`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_BUILD_ID`),
+        actual: platform.build_id,
+      },
+      {
+        label: `Live release manifest ${definition.label} published-at timestamp`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_PUBLISHED_AT`),
+        actual: platform.published_at,
+      },
+      {
+        label: `Live release manifest ${definition.label} release file name`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_FILE_NAME`),
+        actual: platform.file_name,
+      },
+      {
+        label: `Live release manifest ${definition.label} release file size`,
+        expected: readOptionalInteger(serverEnv, `${definition.envPrefix}_RELEASE_FILE_SIZE_BYTES`),
+        actual: platform.file_size_bytes,
+      },
+      {
+        label: `Live release manifest ${definition.label} release checksum`,
+        expected: readServerOnly(serverEnv, `${definition.envPrefix}_RELEASE_SHA256`),
+        actual: platform.checksum_sha256,
+      },
+    ]
+
+    for (const expectation of platformExpectations) {
+      if (!compareRuntimeComparableValues(expectation.expected, expectation.actual)) {
+        pushLiveManifestDriftFailure(failures, expectation.label, expectation.expected, expectation.actual)
+      }
+    }
+  }
+}
+
 function requireAbsoluteUrlCandidate(bucket, label, value) {
   if (!requireNonEmpty(bucket, label, value)) {
     return null
@@ -571,6 +775,13 @@ export function buildRuntimeReadinessReport({
     if (liveReleaseManifest.manifest?.viewer?.authenticated !== false || liveReleaseManifest.manifest?.viewer?.canDownload !== false) {
       failures.push('Live public release manifest viewer posture is not anonymous/non-downloadable.')
     }
+
+    appendLiveReleaseManifestDriftChecks({
+      failures,
+      frontendEnv,
+      serverEnv,
+      liveReleaseManifest,
+    })
   } else if (!liveReleaseManifestAttempted) {
     warnings.push('Live release manifest was not checked; public download-lane runtime posture was evaluated from env posture only.')
   }
diff --git a/website/scripts/runtime-readiness-lib.test.mjs b/website/scripts/runtime-readiness-lib.test.mjs
index 189a14f..e5e3cc0 100644
--- a/website/scripts/runtime-readiness-lib.test.mjs
+++ b/website/scripts/runtime-readiness-lib.test.mjs
@@ -416,6 +416,126 @@ describe('buildRuntimeReadinessReport', () => {
     expect(report.failures).toContain('Live website root is missing the first-party HyperTwist shell marker.')
     expect(report.failures).toContain('Live website root is missing the expected #root app mount.')
   })
+
+  it('fails when the live release manifest drifts from the configured launch authority', () => {
+    const report = buildRuntimeReadinessReport({
+      frontendEnv: {
+        VITE_SUPPORT_EMAIL: 'ops@hypertwist.app',
+        VITE_PUBLIC_DOCS_URL: 'https://docs.hypertwist.app',
+        VITE_RELEASE_NOTES_URL: 'https://notes.hypertwist.app',
+        VITE_SUPERTOKENS_API_DOMAIN: 'https://hypertwist.app',
+        VITE_SUPERTOKENS_WEBSITE_DOMAIN: 'https://hypertwist.app',
+        VITE_AUTH_API_BASE_URL: 'https://hypertwist.app',
+        VITE_PADDLE_CHECKOUT_URL_OPERATOR: 'https://buy.paddle.com/operator-live',
+        VITE_PADDLE_CHECKOUT_URL_STUDIO: 'https://buy.paddle.com/studio-live',
+        VITE_PLAN_PRICE_OPERATOR: '$19 / month',
+        VITE_PLAN_PRICE_STUDIO: '$99 / month',
+        VITE_MPL_SOURCE_URL: 'https://hypertwist.app/open-source/source.zip',
+        VITE_OPEN_SOURCE_REPO_URL: 'https://git.scriptoriumai.io/scriptoriumadmin/hypertwist',
+        VITE_WINDOWS_DOWNLOAD_URL: 'https://downloads.hypertwist.app/windows.exe',
+      },
+      serverEnv: {
+        API_DOMAIN: 'https://hypertwist.app',
+        WEBSITE_DOMAIN: 'https://hypertwist.app',
+        SUPERTOKENS_CORE_URI: 'https://auth-core.internal',
+        COOKIE_SECURE: 'true',
+        PADDLE_WEBHOOK_SECRET: 'secret',
+        PADDLE_PRICE_PLAN_MAP: '{"pri_operator":"operator"}',
+        RELEASE_MANIFEST_VERSION: '1.0.0',
+        RELEASE_MANIFEST_CHANNEL: 'candidate',
+        WINDOWS_RELEASE_BUILD_ID: 'win64-1000',
+        WINDOWS_RELEASE_SHA256: 'abc123',
+        WINDOWS_RELEASE_FILE_SIZE_BYTES: '1048576',
+      },
+      liveHealth: {
+        supertokens: { ready: true },
+        fallback: { active: false },
+        runtime: {
+          public_origin_ready: true,
+          mode: 'public',
+          errors: [],
+          warnings: [],
+        },
+        billing: {
+          webhookSecretConfigured: true,
+          productPlanMapConfigured: false,
+          pricePlanMapConfigured: true,
+        },
+      },
+      liveReleaseManifest: {
+        ok: true,
+        manifest: {
+          support_email: 'hello@hypertwist.app',
+          public_docs_url: 'https://old-docs.hypertwist.app',
+          release_notes_url: 'https://notes.hypertwist.app',
+          corresponding_source_url: 'https://hypertwist.app/open-source/source.zip',
+          open_source_repo_url: 'https://git.scriptoriumai.io/scriptoriumadmin/hypertwist',
+          commerce: {
+            operator_checkout_url: 'https://buy.paddle.com/operator-old',
+            studio_checkout_url: 'https://buy.paddle.com/studio-live',
+            plan_price_operator: '$29 / month',
+            plan_price_studio: '$99 / month',
+          },
+          viewer: {
+            authenticated: false,
+            canDownload: false,
+          },
+          platforms: [
+            {
+              platform_key: 'windows',
+              configured: false,
+              channel: 'preview',
+              version: '0.9.0',
+              build_id: 'old-build',
+              published_at: null,
+              file_name: null,
+              file_size_bytes: 512,
+              checksum_sha256: 'stale',
+              download_url: null,
+            },
+            {
+              platform_key: 'macos',
+              configured: false,
+              channel: 'preview',
+              version: null,
+              build_id: null,
+              published_at: null,
+              file_name: null,
+              file_size_bytes: null,
+              checksum_sha256: null,
+              download_url: null,
+            },
+            {
+              platform_key: 'linux',
+              configured: false,
+              channel: 'preview',
+              version: null,
+              build_id: null,
+              published_at: null,
+              file_name: null,
+              file_size_bytes: null,
+              checksum_sha256: null,
+              download_url: null,
+            },
+          ],
+        },
+      },
+      liveReleaseManifestAttempted: true,
+      liveHealthAttempted: true,
+    })
+
+    expect(report.ok).toBe(false)
+    expect(report.failures).toContain('Live release manifest support email drifted from configured launch authority (expected ops@hypertwist.app, got hello@hypertwist.app).')
+    expect(report.failures).toContain('Live release manifest public docs URL drifted from configured launch authority (expected https://docs.hypertwist.app, got https://old-docs.hypertwist.app).')
+    expect(report.failures).toContain('Live release manifest operator checkout URL drifted from configured launch authority (expected https://buy.paddle.com/operator-live, got https://buy.paddle.com/operator-old).')
+    expect(report.failures).toContain('Live release manifest operator price string drifted from configured launch authority (expected $19 / month, got $29 / month).')
+    expect(report.failures).toContain('Live release manifest Windows configured posture drifted from configured launch authority (expected true, got false).')
+    expect(report.failures).toContain('Live release manifest Windows release channel drifted from configured launch authority (expected candidate, got preview).')
+    expect(report.failures).toContain('Live release manifest Windows release version drifted from configured launch authority (expected 1.0.0, got 0.9.0).')
+    expect(report.failures).toContain('Live release manifest Windows release build ID drifted from configured launch authority (expected win64-1000, got old-build).')
+    expect(report.failures).toContain('Live release manifest Windows release file size drifted from configured launch authority (expected 1048576, got 512).')
+    expect(report.failures).toContain('Live release manifest Windows release checksum drifted from configured launch authority (expected abc123, got stale).')
+  })
 })
 
 describe('deriveHealthBaseUrl', () => {
diff --git a/website/server/README.md b/website/server/README.md
index 02b97c5..b02d900 100644
--- a/website/server/README.md
+++ b/website/server/README.md
@@ -178,6 +178,12 @@ That means the verifier can now fail explicitly when `hypertwist.app` is still
 serving the earlier placeholder rollout page instead of the real same-origin
 website/auth-server deployment.
 
+The same verifier now also compares the live anonymous release-manifest payload
+against the currently configured launch authority for support/docs/source,
+checkout/price, and per-platform release metadata, so a stale host env or
+partially rolled deploy fails as configuration drift instead of passing on
+structural safety alone.
+
 Live same-origin status on `2026-06-22`:
 
 - the root-owned cutover now has `https://hypertwist.app` serving the