diff --git a/.gitea/workflows/manual-publish.yaml b/.gitea/workflows/manual-publish.yaml
index b391ce2..a7bd3b5 100644
--- a/.gitea/workflows/manual-publish.yaml
+++ b/.gitea/workflows/manual-publish.yaml
@@ -40,6 +40,9 @@ jobs:
         
         # Install tar for packaging
         which tar || sudo apt-get update && sudo apt-get install -y tar
+        
+        # Install xxhash for calculating template hashes
+        which xxhsum || sudo apt-get update && sudo apt-get install -y xxhash
     
     - name: Bump versions if requested
       if: inputs.bump_version != 'none'
diff --git a/.gitea/workflows/test-and-publish.yaml b/.gitea/workflows/test-and-publish.yaml
index 75f346c..a0bd933 100644
--- a/.gitea/workflows/test-and-publish.yaml
+++ b/.gitea/workflows/test-and-publish.yaml
@@ -27,6 +27,9 @@ jobs:
         
         # Install tar for packaging
         which tar || sudo apt-get update && sudo apt-get install -y tar
+        
+        # Install xxhash for calculating template hashes
+        which xxhsum || sudo apt-get update && sudo apt-get install -y xxhash
     
     - name: Run tests
       run: |
diff --git a/publish.sh b/publish.sh
index d7d4f51..e196354 100755
--- a/publish.sh
+++ b/publish.sh
@@ -115,21 +115,26 @@ for TEMPLATE in $TEMPLATES_TO_PUBLISH; do
     SIZE=$(du -h "$TARBALL" | cut -f1)
     info "Created $TEMPLATE.tgz ($SIZE)"
     
+    # Calculate XXHash64 of the unpacked template contents
+    info "Calculating XXHash64 for $TEMPLATE"
+    XXHASH=$(find "$TEMPLATE" -type f -exec xxhsum -H64 {} \; | sort | xxhsum -H64 | cut -d' ' -f1)
+    info "XXHash64 for $TEMPLATE: $XXHASH"
+    
     # Upload to templates.dropshell.app using sos
     info "Uploading $TEMPLATE to templates.dropshell.app"
     
     # Always upload with :latest tag
-    sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:latest" || die "Failed to upload $TEMPLATE:latest"
+    sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:latest" --metadata "templateXXHash64=$XXHASH" || die "Failed to upload $TEMPLATE:latest"
     info "Uploaded ${TEMPLATE}:latest"
     
     # Also upload with specific version tag
-    sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:${VERSION}" || die "Failed to upload $TEMPLATE:${VERSION}"
+    sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:${VERSION}" --metadata "templateXXHash64=$XXHASH" || die "Failed to upload $TEMPLATE:${VERSION}"
     info "Uploaded ${TEMPLATE}:${VERSION}"
     
     # If we have a major version, also tag with major version only (e.g., v1)
     MAJOR_VERSION=$(echo "$VERSION" | cut -d. -f1)
     if [ -n "$MAJOR_VERSION" ]; then
-        sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:v${MAJOR_VERSION}" || die "Failed to upload $TEMPLATE:v${MAJOR_VERSION}"
+        sos upload templates.dropshell.app "$TARBALL" "${TEMPLATE}:v${MAJOR_VERSION}" --metadata "templateXXHash64=$XXHASH" || die "Failed to upload $TEMPLATE:v${MAJOR_VERSION}"
         info "Uploaded ${TEMPLATE}:v${MAJOR_VERSION}"
     fi