diff --git a/package-lock.json b/package-lock.json
index 58b17da..7a10a90 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@hono/node-server": "^1.19.6",
         "@noble/ed25519": "^3.0.0",
+        "@xtr-dev/rondevu-client": "^0.13.0",
         "better-sqlite3": "^12.4.1",
         "hono": "^4.10.4"
       },
@@ -23,9 +24,9 @@
       }
     },
     "node_modules/@cloudflare/workers-types": {
-      "version": "4.20251115.0",
-      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20251115.0.tgz",
-      "integrity": "sha512-aM7jp7IfKhqKvfSaK1IhVTbSzxB6KQ4gX8e/W29tOuZk+YHlYXuRd/bMm4hWkfd7B1HWNWdsx1GTaEUoZIuVsw==",
+      "version": "4.20251209.0",
+      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20251209.0.tgz",
+      "integrity": "sha512-O+cbUVwgb4NgUB39R1cITbRshlAAPy1UQV0l8xEy2xcZ3wTh3fMl9f5oBwLsVmE9JRhIZx6llCLOBVf53eI5xA==",
       "dev": true,
       "license": "MIT OR Apache-2.0"
     },
@@ -485,9 +486,9 @@
       }
     },
     "node_modules/@hono/node-server": {
-      "version": "1.19.6",
-      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.6.tgz",
-      "integrity": "sha512-Shz/KjlIeAhfiuE93NDKVdZ7HdBVLQAfdbaXEaoAVO3ic9ibRSLGIQGkcBbFyuLr+7/1D5ZCINM8B+6IvXeMtw==",
+      "version": "1.19.7",
+      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.7.tgz",
+      "integrity": "sha512-vUcD0uauS7EU2caukW8z5lJKtoGMokxNbJtBiwHgpqxEXokaHCBkQUmCHhjFB1VUTWdqj25QoMkMKzgjq+uhrw==",
       "license": "MIT",
       "engines": {
         "node": ">=18.14.1"
@@ -572,15 +573,24 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "24.10.1",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.10.1.tgz",
-      "integrity": "sha512-GNWcUTRBgIRJD5zj+Tq0fKOJ5XZajIiBroOF0yvj2bSU1WvNdYS/dn9UxwsujGW4JX06dnHyjV2y9rRaybH0iQ==",
+      "version": "24.10.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.10.2.tgz",
+      "integrity": "sha512-WOhQTZ4G8xZ1tjJTvKOpyEVSGgOTvJAfDK3FNFgELyaTpzhdgHVHeqW8V+UJvzF5BT+/B54T/1S2K6gd9c7bbA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
         "undici-types": "~7.16.0"
       }
     },
+    "node_modules/@xtr-dev/rondevu-client": {
+      "version": "0.13.0",
+      "resolved": "https://registry.npmjs.org/@xtr-dev/rondevu-client/-/rondevu-client-0.13.0.tgz",
+      "integrity": "sha512-oauCveLga4lploxpoW8U0Fd9Fyz+SAsNQzIDvAIG1fkAnAJu9eajmLsZ5JfzzDi7h2Ew1ClZ7MOrmlRfG4vaBg==",
+      "license": "MIT",
+      "dependencies": {
+        "@noble/ed25519": "^3.0.0"
+      }
+    },
     "node_modules/acorn": {
       "version": "8.15.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
@@ -635,9 +645,9 @@
       "license": "MIT"
     },
     "node_modules/better-sqlite3": {
-      "version": "12.4.1",
-      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.4.1.tgz",
-      "integrity": "sha512-3yVdyZhklTiNrtg+4WqHpJpFDd+WHTg2oM7UcR80GqL05AOV0xEJzc6qNvFYoEtE+hRp1n9MpN6/+4yhlGkDXQ==",
+      "version": "12.5.0",
+      "resolved": "https://registry.npmjs.org/better-sqlite3/-/better-sqlite3-12.5.0.tgz",
+      "integrity": "sha512-WwCZ/5Diz7rsF29o27o0Gcc1Du+l7Zsv7SYtVPG0X3G/uUI1LqdxrQI7c9Hs2FWpqXXERjW9hp6g3/tH7DlVKg==",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {
@@ -645,7 +655,7 @@
         "prebuild-install": "^7.1.1"
       },
       "engines": {
-        "node": "20.x || 22.x || 23.x || 24.x"
+        "node": "20.x || 22.x || 23.x || 24.x || 25.x"
       }
     },
     "node_modules/bindings": {
@@ -827,9 +837,9 @@
       "license": "MIT"
     },
     "node_modules/hono": {
-      "version": "4.10.6",
-      "resolved": "https://registry.npmjs.org/hono/-/hono-4.10.6.tgz",
-      "integrity": "sha512-BIdolzGpDO9MQ4nu3AUuDwHZZ+KViNm+EZ75Ae55eMXMqLVhDFqEMXxtUe9Qh8hjL+pIna/frs2j6Y2yD5Ua/g==",
+      "version": "4.10.8",
+      "resolved": "https://registry.npmjs.org/hono/-/hono-4.10.8.tgz",
+      "integrity": "sha512-DDT0A0r6wzhe8zCGoYOmMeuGu3dyTAE40HHjwUsWFTEy5WxK1x2WDSsBPlEXgPbRIFY6miDualuUDbasPogIww==",
       "license": "MIT",
       "engines": {
         "node": ">=16.9.0"
diff --git a/package.json b/package.json
index 4c5f79f..037e01c 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
   "dependencies": {
     "@hono/node-server": "^1.19.6",
     "@noble/ed25519": "^3.0.0",
+    "@xtr-dev/rondevu-client": "^0.13.0",
     "better-sqlite3": "^12.4.1",
     "hono": "^4.10.4"
   }
diff --git a/src/crypto.ts b/src/crypto.ts
index 61298a0..b43b015 100644
--- a/src/crypto.ts
+++ b/src/crypto.ts
@@ -425,16 +425,24 @@ export async function validateServicePublish(
   }
 
   // Parse message format: "publish:{username}:{serviceFqn}:{timestamp}"
+  // Note: serviceFqn can contain colons (e.g., "chat:2.0.0@user"), so we need careful parsing
   const parts = message.split(':');
-  if (parts.length !== 4 || parts[0] !== 'publish' || parts[1] !== username || parts[2] !== serviceFqn) {
+  if (parts.length < 4 || parts[0] !== 'publish' || parts[1] !== username) {
     return { valid: false, error: 'Invalid message format (expected: publish:{username}:{serviceFqn}:{timestamp})' };
   }
 
-  const timestamp = parseInt(parts[3], 10);
+  // The timestamp is the last part
+  const timestamp = parseInt(parts[parts.length - 1], 10);
   if (isNaN(timestamp)) {
     return { valid: false, error: 'Invalid timestamp in message' };
   }
 
+  // The serviceFqn is everything between username and timestamp
+  const extractedServiceFqn = parts.slice(2, parts.length - 1).join(':');
+  if (extractedServiceFqn !== serviceFqn) {
+    return { valid: false, error: `Service FQN mismatch (expected: ${serviceFqn}, got: ${extractedServiceFqn})` };
+  }
+
   // Validate timestamp
   const timestampCheck = validateTimestamp(timestamp);
   if (!timestampCheck.valid) {