diff --git a/.github/workflows/vercel-web-deploy.yml b/.github/workflows/vercel-web-deploy.yml
index eaa38eb8..28b256b9 100644
--- a/.github/workflows/vercel-web-deploy.yml
+++ b/.github/workflows/vercel-web-deploy.yml
@@ -49,5 +49,37 @@ jobs:
         run: npx vercel@latest build --prod --token=$VERCEL_TOKEN
 
       - name: Deploy web to Vercel production
+        id: deploy
         working-directory: web
-        run: npx vercel@latest deploy --prebuilt --prod --token=$VERCEL_TOKEN
+        run: |
+          deployment_url="$(npx vercel@latest deploy --prebuilt --prod --token=$VERCEL_TOKEN)"
+          echo "deployment_url=${deployment_url}" >> "$GITHUB_OUTPUT"
+
+      - name: Smoke-check production deployment
+        env:
+          DEPLOYMENT_URL: ${{ steps.deploy.outputs.deployment_url }}
+          PRODUCTION_URL: https://blockdata.run
+        run: |
+          node --input-type=module - <<'EOF'
+          const targets = [
+            ['deployment', process.env.DEPLOYMENT_URL?.trim()],
+            ['production', process.env.PRODUCTION_URL?.trim()],
+          ];
+
+          for (const [label, url] of targets) {
+            if (!url) {
+              throw new Error(`Missing ${label} url for smoke verification`);
+            }
+
+            const response = await fetch(url, { redirect: 'follow' });
+            const html = await response.text();
+
+            if (!response.ok) {
+              throw new Error(`${label} smoke check failed with ${response.status} for ${url}`);
+            }
+
+            if (!html.includes('<title>BlockData</title>')) {
+              throw new Error(`${label} smoke check did not find the BlockData HTML title for ${url}`);
+            }
+          }
+          EOF
diff --git a/scripts/tests/vercel-web-deploy-workflow.test.mjs b/scripts/tests/vercel-web-deploy-workflow.test.mjs
index 2b255e39..56f59ba0 100644
--- a/scripts/tests/vercel-web-deploy-workflow.test.mjs
+++ b/scripts/tests/vercel-web-deploy-workflow.test.mjs
@@ -42,4 +42,17 @@ test('vercel web deploy workflow is repo-owned and production-scoped', () => {
   assert.match(workflow, /vercel@latest pull --yes --environment=production/, 'workflow must pull production config');
   assert.match(workflow, /vercel@latest build --prod/, 'workflow must build through Vercel CLI');
   assert.match(workflow, /vercel@latest deploy --prebuilt --prod/, 'workflow must deploy the prebuilt output');
+  assert.match(workflow, /id:\s*deploy/, 'workflow must capture the production deploy step output');
+  assert.match(workflow, /PRODUCTION_URL:\s*https:\/\/blockdata\.run/, 'workflow must smoke-check the official production domain');
+  assert.match(workflow, /BlockData/, 'workflow smoke verification must assert the production shell marker');
+});
+
+test('web vercel config disables direct master git deployments', () => {
+  const config = JSON.parse(read('web/vercel.json'));
+
+  assert.equal(
+    config.git?.deploymentEnabled?.master,
+    false,
+    'web/vercel.json must disable direct Vercel Git deployments for master so production flows through the repo-owned workflow',
+  );
 });
diff --git a/web/vercel.json b/web/vercel.json
index 8b166e22..a55eb51f 100644
--- a/web/vercel.json
+++ b/web/vercel.json
@@ -1,4 +1,10 @@
 {
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "git": {
+    "deploymentEnabled": {
+      "master": false
+    }
+  },
   "outputDirectory": "dist",
   "rewrites": [
     { "source": "/docs/:path*", "destination": "https://blockdata-ct.vercel.app/docs/:path*" }