diff --git a/.github/workflows/publish-npm.yaml b/.github/workflows/publish-npm.yaml
index 9a66bf4..592a33a 100644
--- a/.github/workflows/publish-npm.yaml
+++ b/.github/workflows/publish-npm.yaml
@@ -59,6 +59,21 @@ jobs:
       - name: Clean and Build
         run: npm run build
 
+      - name: Verify package contents
+        run: |
+          if [ ! -f lib/index.js ]; then
+            echo "Error: lib/index.js missing after build. Refusing to publish."
+            exit 1
+          fi
+
+          # Ensure the tarball includes the compiled entrypoint and excludes TypeScript sources
+          PACK_LIST=$(npm pack --dry-run 2>&1)
+          echo "$PACK_LIST"
+          echo "$PACK_LIST" | grep -q 'lib/index.js' || { echo "Error: lib/index.js not in package tarball."; exit 1; }
+          echo "$PACK_LIST" | grep -q 'src/' && { echo "Error: TypeScript src/ must not be published."; exit 1; } || true
+          echo "$PACK_LIST" | grep -q 'contracts/' || { echo "Error: contracts/ missing from package tarball."; exit 1; }
+          echo "Package contents look correct ✅"
+
       - name: Publish Package
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/package.json b/package.json
index d58148a..ed5b3d4 100644
--- a/package.json
+++ b/package.json
@@ -6,11 +6,19 @@
   "bin": {
     "wire-cli": "lib/index.js"
   },
+  "files": [
+    "lib",
+    "contracts",
+    "blockproducer",
+    "chain-api",
+    "bp-relay"
+  ],
   "scripts": {
     "test": "jest",
-    "start": "tsc && node bin/index.js",
+    "start": "tsc && node lib/index.js",
     "build": "tsc",
-    "watch": "tsc -w"
+    "watch": "tsc -w",
+    "prepublishOnly": "npm run build"
   },
   "keywords": [],
   "author": "Svetla Syrimis",