diff --git a/client/src/components/message-bubble.riot b/client/src/components/message-bubble.riot
index 2692045..70a899b 100644
--- a/client/src/components/message-bubble.riot
+++ b/client/src/components/message-bubble.riot
@@ -23,6 +23,7 @@
       <div class={'message-header ' + (props.isOwn ? 'own' : '')}>
         <span class="sender-name">{props.message?.sender_name}</span>
         <span class="message-time">{formatTime(props.message?.created_at)}</span>
+        <span if={props.message?.hash} class="message-hash" title={props.message.hash}>{props.message.hash.slice(0, 7)}</span>
       </div>
       <div if={hasToolResults()} class="tool-results-section">
         <div each={tr in getToolResults()} class="tool-result-item">
@@ -152,6 +153,20 @@
       color: var(--text-muted);
     }
 
+    .message-hash {
+      font-family: var(--font-mono, 'SF Mono', 'Fira Code', monospace);
+      font-size: 10px;
+      color: var(--text-muted);
+      opacity: 0.5;
+      cursor: default;
+      user-select: all;
+      transition: opacity var(--transition-fast);
+    }
+
+    .message-hash:hover {
+      opacity: 1;
+    }
+
     .message-content {
       padding: var(--space-sm) var(--space-md);
       border-radius: var(--radius-lg);