3 changed files with 165 additions and 2 deletions
--- a/app.js
+++ b/app.js
@@ -34,6 +34,9 @@ let debugOverlay;
 let frameCount = 0, lastFPSTime = 0, fps = 0;
 let chatOpen = true;
 let loadProgress = 0;
+let nostrPubkey = null;
+
+const NOSTR_STORAGE_KEY = 'nexus_nostr_pubkey';

 // ═══ INIT ═══
 function init() {
@@ -95,6 +98,9 @@ function init() {
  setupControls();
  window.addEventListener('resize', onResize);

+  // NIP-07 identity (after DOM is ready)
+  initNostrIdentity();
+
  // Debug overlay ref
  debugOverlay = document.getElementById('debug-overlay');

@@ -866,7 +872,8 @@ function addChatMessage(type, text) {
  const container = document.getElementById('chat-messages');
  const div = document.createElement('div');
  div.className = `chat-msg chat-msg-${type}`;
-  const prefixes = { user: '[ALEXANDER]', timmy: '[TIMMY]', system: '[NEXUS]', error: '[ERROR]' };
+  const userPrefix = nostrPubkey ? `[${formatPubkey(nostrPubkey)}]` : '[VISITOR]';
+  const prefixes = { user: userPrefix, timmy: '[TIMMY]', system: '[NEXUS]', error: '[ERROR]' };
  div.innerHTML = `<span class="chat-msg-prefix">${prefixes[type] || '[???]'}</span> ${text}`;
  container.appendChild(div);
  container.scrollTop = container.scrollHeight;
@@ -980,5 +987,71 @@ function onResize() {
  composer.setSize(w, h);
 }

+// ═══ NIP-07 NOSTR IDENTITY ═══
+function formatPubkey(hex) {
+  return hex.slice(0, 8) + '…' + hex.slice(-4);
+}
+
+function setNostrIdentity(pubkey) {
+  nostrPubkey = pubkey;
+  localStorage.setItem(NOSTR_STORAGE_KEY, pubkey);
+  document.getElementById('nostr-anon').style.display = 'none';
+  document.getElementById('nostr-connect-btn').style.display = 'none';
+  document.getElementById('nostr-pubkey-display').textContent = formatPubkey(pubkey);
+  document.getElementById('nostr-connected').style.display = 'flex';
+  addChatMessage('system', `Identity connected: <span style="color:var(--color-primary)">${formatPubkey(pubkey)}</span>. Timmy recognizes you.`);
+}
+
+function clearNostrIdentity() {
+  nostrPubkey = null;
+  localStorage.removeItem(NOSTR_STORAGE_KEY);
+  document.getElementById('nostr-connected').style.display = 'none';
+  document.getElementById('nostr-anon').style.display = 'flex';
+  if (window.nostr) {
+    document.getElementById('nostr-connect-btn').style.display = 'flex';
+  }
+  addChatMessage('system', 'Identity disconnected. Visitor is anonymous.');
+}
+
+function initNostrIdentity() {
+  const connectBtn = document.getElementById('nostr-connect-btn');
+  const disconnectBtn = document.getElementById('nostr-disconnect-btn');
+
+  connectBtn.addEventListener('click', async () => {
+    try {
+      connectBtn.disabled = true;
+      connectBtn.textContent = 'Connecting…';
+      const pubkey = await window.nostr.getPublicKey();
+      if (pubkey && /^[0-9a-f]{64}$/i.test(pubkey)) {
+        setNostrIdentity(pubkey);
+      } else {
+        throw new Error('Invalid pubkey returned');
+      }
+    } catch (err) {
+      addChatMessage('error', 'Identity request declined or extension unavailable.');
+      connectBtn.disabled = false;
+      connectBtn.innerHTML = '<span class="nostr-icon">⚡</span> Connect Identity';
+    }
+  });
+
+  disconnectBtn.addEventListener('click', () => {
+    clearNostrIdentity();
+  });
+
+  // Check for saved identity in localStorage
+  const saved = localStorage.getItem(NOSTR_STORAGE_KEY);
+  if (saved && /^[0-9a-f]{64}$/i.test(saved)) {
+    nostrPubkey = saved;
+    document.getElementById('nostr-anon').style.display = 'none';
+    document.getElementById('nostr-pubkey-display').textContent = formatPubkey(saved);
+    document.getElementById('nostr-connected').style.display = 'flex';
+  } else if (window.nostr) {
+    // Extension available, offer connect
+    document.getElementById('nostr-anon').style.display = 'none';
+    connectBtn.style.display = 'flex';
+  }
+  // else: stays anonymous (default)
+}
+
 // ═══ START ═══
 init();
--- a/index.html
+++ b/index.html
@@ -86,7 +86,7 @@
        <span class="chat-msg-prefix">[NEXUS]</span> Sovereign space initialized. Timmy is observing.
      </div>
      <div class="chat-msg chat-msg-timmy">
-        <span class="chat-msg-prefix">[TIMMY]</span> Welcome to the Nexus, Alexander. All systems nominal.
+        <span class="chat-msg-prefix">[TIMMY]</span> Welcome to the Nexus. Connect your Nostr identity or explore anonymously.
      </div>
    </div>
    <div class="chat-input-row">
@@ -95,6 +95,21 @@
    </div>
  </div>

+  <!-- Top Right: Nostr Identity -->
+  <div id="nostr-identity" class="nostr-identity">
+    <button id="nostr-connect-btn" class="nostr-btn nostr-btn-connect" style="display:none;" title="Connect Nostr identity via NIP-07">
+      <span class="nostr-icon">⚡</span> Connect Identity
+    </button>
+    <div id="nostr-connected" class="nostr-connected" style="display:none;">
+      <span class="nostr-icon">⚡</span>
+      <span id="nostr-pubkey-display" class="nostr-pubkey"></span>
+      <button id="nostr-disconnect-btn" class="nostr-btn nostr-btn-disconnect" title="Disconnect identity">✕</button>
+    </div>
+    <div id="nostr-anon" class="nostr-anon">
+      <span class="nostr-icon-muted">◌</span> Anonymous
+    </div>
+  </div>
+
  <!-- Minimap / Controls hint -->
  <div class="hud-controls">
    <span>WASD</span> move &nbsp; <span>Mouse</span> look &nbsp; <span>Enter</span> chat
--- a/style.css
+++ b/style.css
@@ -330,6 +330,81 @@ canvas#nexus-canvas {
  background: rgba(74, 240, 192, 0.1);
 }

+/* === NOSTR IDENTITY === */
+.nostr-identity {
+  position: absolute;
+  top: var(--space-3);
+  right: var(--space-4);
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  pointer-events: auto;
+}
+.nostr-btn {
+  background: none;
+  border: 1px solid var(--color-border);
+  border-radius: 4px;
+  font-family: var(--font-body);
+  font-size: var(--text-xs);
+  cursor: pointer;
+  transition: background var(--transition-ui), border-color var(--transition-ui);
+  display: flex;
+  align-items: center;
+  gap: var(--space-1);
+}
+.nostr-btn-connect {
+  padding: var(--space-1) var(--space-3);
+  color: var(--color-primary);
+  border-color: rgba(74, 240, 192, 0.3);
+}
+.nostr-btn-connect:hover {
+  background: rgba(74, 240, 192, 0.1);
+  border-color: rgba(74, 240, 192, 0.6);
+}
+.nostr-btn-disconnect {
+  padding: 2px var(--space-2);
+  color: var(--color-text-muted);
+  border-color: transparent;
+  font-size: 10px;
+  line-height: 1;
+}
+.nostr-btn-disconnect:hover {
+  color: var(--color-danger);
+  border-color: rgba(255, 68, 102, 0.3);
+}
+.nostr-connected {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  background: rgba(74, 240, 192, 0.05);
+  border: 1px solid rgba(74, 240, 192, 0.25);
+  border-radius: 4px;
+  padding: var(--space-1) var(--space-3);
+  font-size: var(--text-xs);
+}
+.nostr-icon {
+  color: var(--color-primary);
+  font-style: normal;
+}
+.nostr-pubkey {
+  font-family: var(--font-body);
+  font-size: var(--text-xs);
+  color: var(--color-primary);
+  letter-spacing: 0.05em;
+}
+.nostr-anon {
+  font-size: var(--text-xs);
+  color: var(--color-text-muted);
+  display: flex;
+  align-items: center;
+  gap: var(--space-1);
+  padding: var(--space-1) var(--space-2);
+}
+.nostr-icon-muted {
+  color: var(--color-text-muted);
+  font-style: normal;
+}
+
 /* === FOOTER === */
 .nexus-footer {
  position: fixed;