diff --git a/src/components/feed/Feed.tsx b/src/components/feed/Feed.tsx
index 270e4c5..502c70a 100644
--- a/src/components/feed/Feed.tsx
+++ b/src/components/feed/Feed.tsx
@@ -42,7 +42,11 @@ export function Feed() {
 
   const filteredNotes = activeNotes.filter((event) => {
     const c = event.content.trim();
-    return c.length > 0 && !c.startsWith("{") && !c.startsWith("[");
+    if (!c || c.startsWith("{") || c.startsWith("[")) return false;
+    // Filter out notes that look like base64 blobs or relay protocol messages
+    if (c.length > 500 && /^[A-Za-z0-9+/=]{50,}$/.test(c.slice(0, 100))) return false;
+    if (c.startsWith("nlogpost:") || c.startsWith("T1772")) return false;
+    return true;
   });
 
   return (
diff --git a/src/components/profile/ProfileView.tsx b/src/components/profile/ProfileView.tsx
index a510a31..b044f66 100644
--- a/src/components/profile/ProfileView.tsx
+++ b/src/components/profile/ProfileView.tsx
@@ -1,24 +1,118 @@
 import { useEffect, useState } from "react";
 import { NDKEvent } from "@nostr-dev-kit/ndk";
 import { useUIStore } from "../../stores/ui";
+import { useUserStore } from "../../stores/user";
 import { useProfile } from "../../hooks/useProfile";
-import { fetchUserNotes } from "../../lib/nostr";
+import { fetchUserNotes, publishProfile } from "../../lib/nostr";
 import { shortenPubkey } from "../../lib/utils";
 import { NoteCard } from "../feed/NoteCard";
 
+function EditProfileForm({ pubkey, onSaved }: { pubkey: string; onSaved: () => void }) {
+  const { profile, fetchOwnProfile } = useUserStore();
+  const [name, setName] = useState(profile?.name || "");
+  const [displayName, setDisplayName] = useState(profile?.displayName || "");
+  const [about, setAbout] = useState(profile?.about || "");
+  const [picture, setPicture] = useState(profile?.picture || "");
+  const [banner, setBanner] = useState(profile?.banner || "");
+  const [website, setWebsite] = useState(profile?.website || "");
+  const [nip05, setNip05] = useState(profile?.nip05 || "");
+  const [lud16, setLud16] = useState(profile?.lud16 || "");
+  const [saving, setSaving] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [saved, setSaved] = useState(false);
+
+  const handleSave = async () => {
+    setSaving(true);
+    setError(null);
+    try {
+      await publishProfile({
+        name: name.trim() || undefined,
+        display_name: displayName.trim() || undefined,
+        about: about.trim() || undefined,
+        picture: picture.trim() || undefined,
+        banner: banner.trim() || undefined,
+        website: website.trim() || undefined,
+        nip05: nip05.trim() || undefined,
+        lud16: lud16.trim() || undefined,
+      });
+      await fetchOwnProfile();
+      setSaved(true);
+      setTimeout(onSaved, 1000);
+    } catch (err) {
+      setError(`Failed to save: ${err}`);
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const field = (label: string, value: string, onChange: (v: string) => void, placeholder = "") => (
+    <div>
+      <label className="text-text-dim text-[10px] block mb-1">{label}</label>
+      <input
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        placeholder={placeholder}
+        className="w-full bg-bg border border-border px-3 py-1.5 text-text text-[12px] focus:outline-none focus:border-accent/50"
+        style={{ WebkitUserSelect: "text", userSelect: "text" } as React.CSSProperties}
+      />
+    </div>
+  );
+
+  return (
+    <div className="px-4 py-4 border-b border-border">
+      <div className="grid grid-cols-2 gap-3 mb-3">
+        {field("Display name", displayName, setDisplayName, "Square that Circle")}
+        {field("Username", name, setName, "squarethecircle")}
+        {field("NIP-05 (verified name)", nip05, setNip05, "you@domain.com")}
+        {field("Lightning address (lud16)", lud16, setLud16, "you@walletofsatoshi.com")}
+        {field("Website", website, setWebsite, "https://…")}
+        {field("Profile picture URL", picture, setPicture, "https://…")}
+      </div>
+      <div className="mb-3">
+        <label className="text-text-dim text-[10px] block mb-1">Bio</label>
+        <textarea
+          value={about}
+          onChange={(e) => setAbout(e.target.value)}
+          placeholder="Tell people about yourself…"
+          rows={3}
+          className="w-full bg-bg border border-border px-3 py-1.5 text-text text-[12px] resize-none focus:outline-none focus:border-accent/50"
+          style={{ WebkitUserSelect: "text", userSelect: "text" } as React.CSSProperties}
+        />
+      </div>
+      <div className="mb-3">
+        {field("Banner image URL", banner, setBanner, "https://…")}
+      </div>
+      {error && <p className="text-danger text-[11px] mb-2">{error}</p>}
+      <div className="flex items-center gap-2">
+        <button
+          onClick={handleSave}
+          disabled={saving || saved}
+          className="px-4 py-1.5 text-[11px] bg-accent hover:bg-accent-hover text-white transition-colors disabled:opacity-30 disabled:cursor-not-allowed"
+        >
+          {saved ? "saved ✓" : saving ? "saving…" : "save profile"}
+        </button>
+      </div>
+    </div>
+  );
+}
+
 export function ProfileView() {
   const { selectedPubkey, goBack } = useUIStore();
+  const { pubkey: ownPubkey } = useUserStore();
   const pubkey = selectedPubkey!;
-  const profile = useProfile(pubkey);
+  const isOwn = pubkey === ownPubkey;
 
+  const profile = useProfile(pubkey);
   const [notes, setNotes] = useState<NDKEvent[]>([]);
   const [loading, setLoading] = useState(true);
+  const [editing, setEditing] = useState(false);
 
   const name = profile?.displayName || profile?.name || shortenPubkey(pubkey);
   const avatar = profile?.picture;
   const about = profile?.about;
   const nip05 = profile?.nip05;
   const website = profile?.website;
+  const lud16 = profile?.lud16;
 
   useEffect(() => {
     setLoading(true);
@@ -31,73 +125,73 @@ export function ProfileView() {
   return (
     <div className="h-full flex flex-col">
       {/* Header */}
-      <header className="border-b border-border px-4 py-2.5 flex items-center gap-3 shrink-0">
-        <button
-          onClick={goBack}
-          className="text-text-dim hover:text-text text-[11px] transition-colors"
-        >
-          ← back
-        </button>
-        <h1 className="text-text text-sm font-medium">Profile</h1>
+      <header className="border-b border-border px-4 py-2.5 flex items-center justify-between shrink-0">
+        <div className="flex items-center gap-3">
+          <button
+            onClick={editing ? () => setEditing(false) : goBack}
+            className="text-text-dim hover:text-text text-[11px] transition-colors"
+          >
+            ← {editing ? "cancel" : "back"}
+          </button>
+          <h1 className="text-text text-sm font-medium">{isOwn ? "Your Profile" : "Profile"}</h1>
+        </div>
+        {isOwn && !editing && (
+          <button
+            onClick={() => setEditing(true)}
+            className="text-[11px] px-3 py-1 border border-border text-text-muted hover:text-accent hover:border-accent/40 transition-colors"
+          >
+            edit profile
+          </button>
+        )}
       </header>
 
       <div className="flex-1 overflow-y-auto">
+        {/* Edit form */}
+        {editing && (
+          <EditProfileForm pubkey={pubkey} onSaved={() => setEditing(false)} />
+        )}
+
         {/* Profile card */}
-        <div className="border-b border-border px-4 py-4">
-          <div className="flex gap-4 items-start">
-            {avatar ? (
-              <img
-                src={avatar}
-                alt=""
-                className="w-14 h-14 rounded-sm object-cover bg-bg-raised shrink-0"
-                onError={(e) => { (e.target as HTMLImageElement).style.display = "none"; }}
-              />
-            ) : (
-              <div className="w-14 h-14 rounded-sm bg-bg-raised border border-border flex items-center justify-center text-text-dim text-lg shrink-0">
-                {name.charAt(0).toUpperCase()}
+        {!editing && (
+          <div className="border-b border-border">
+            {/* Banner */}
+            {profile?.banner && (
+              <div className="h-24 bg-bg-raised overflow-hidden">
+                <img src={profile.banner} alt="" className="w-full h-full object-cover" onError={(e) => { (e.target as HTMLImageElement).style.display = "none"; }} />
               </div>
             )}
 
-            <div className="min-w-0">
-              <div className="text-text font-medium text-[15px]">{name}</div>
-              {nip05 && (
-                <div className="text-text-dim text-[11px] mt-0.5">{nip05}</div>
+            <div className="px-4 py-4 flex gap-4 items-start">
+              {avatar ? (
+                <img src={avatar} alt="" className="w-14 h-14 rounded-sm object-cover bg-bg-raised shrink-0" onError={(e) => { (e.target as HTMLImageElement).style.display = "none"; }} />
+              ) : (
+                <div className="w-14 h-14 rounded-sm bg-bg-raised border border-border flex items-center justify-center text-text-dim text-lg shrink-0">
+                  {name.charAt(0).toUpperCase()}
+                </div>
               )}
-              {website && (
-                <a
-                  href={website}
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  className="text-accent text-[11px] hover:text-accent-hover mt-0.5 block"
-                >
-                  {website.replace(/^https?:\/\//, "")}
-                </a>
-              )}
-              {about && (
-                <p className="text-text text-[12px] mt-2 leading-relaxed whitespace-pre-wrap">
-                  {about}
-                </p>
-              )}
-              <div className="text-text-dim text-[10px] font-mono mt-2">
-                {shortenPubkey(pubkey)}
+
+              <div className="min-w-0 flex-1">
+                <div className="text-text font-medium text-[15px]">{name}</div>
+                {nip05 && <div className="text-text-dim text-[11px] mt-0.5">{nip05}</div>}
+                {lud16 && <div className="text-zap text-[11px] mt-0.5">⚡ {lud16}</div>}
+                {website && (
+                  <a href={website} target="_blank" rel="noopener noreferrer" className="text-accent text-[11px] hover:text-accent-hover mt-0.5 block">
+                    {website.replace(/^https?:\/\//, "")}
+                  </a>
+                )}
+                {about && <p className="text-text text-[12px] mt-2 leading-relaxed whitespace-pre-wrap">{about}</p>}
+                {isOwn && !about && (
+                  <p className="text-text-dim text-[12px] mt-2 italic">No bio yet — click "edit profile" to add one.</p>
+                )}
+                <div className="text-text-dim text-[10px] font-mono mt-2">{shortenPubkey(pubkey)}</div>
               </div>
             </div>
           </div>
-        </div>
+        )}
 
         {/* Notes */}
-        {loading && (
-          <div className="px-4 py-8 text-text-dim text-[12px] text-center">
-            Loading notes…
-          </div>
-        )}
-
-        {!loading && notes.length === 0 && (
-          <div className="px-4 py-8 text-text-dim text-[12px] text-center">
-            No notes found.
-          </div>
-        )}
-
+        {loading && <div className="px-4 py-8 text-text-dim text-[12px] text-center">Loading notes…</div>}
+        {!loading && notes.length === 0 && <div className="px-4 py-8 text-text-dim text-[12px] text-center">No notes found.</div>}
         {notes.map((event) => (
           <NoteCard key={event.id} event={event} />
         ))}
diff --git a/src/components/sidebar/Sidebar.tsx b/src/components/sidebar/Sidebar.tsx
index 739cea2..7e82aa9 100644
--- a/src/components/sidebar/Sidebar.tsx
+++ b/src/components/sidebar/Sidebar.tsx
@@ -12,7 +12,7 @@ const NAV_ITEMS = [
 ] as const;
 
 export function Sidebar() {
-  const { currentView, setView, sidebarCollapsed, toggleSidebar, openThread, goBack } = useUIStore();
+  const { currentView, setView, sidebarCollapsed, toggleSidebar, openProfile } = useUIStore();
   const { connected, notes } = useFeedStore();
   const { loggedIn, profile, npub, logout } = useUserStore();
   const [showLogin, setShowLogin] = useState(false);
@@ -77,7 +77,10 @@ export function Sidebar() {
           <div className="border-t border-border shrink-0">
             {loggedIn ? (
               <div className="px-3 py-2">
-                <div className="flex items-center gap-2 mb-1.5">
+                <div
+                  className="flex items-center gap-2 mb-1.5 cursor-pointer hover:opacity-80 transition-opacity"
+                  onClick={() => { const { pubkey } = useUserStore.getState(); if (pubkey) openProfile(pubkey); }}
+                >
                   {userAvatar ? (
                     <img
                       src={userAvatar}
diff --git a/src/components/thread/ThreadView.tsx b/src/components/thread/ThreadView.tsx
index ec36b92..6b2bc63 100644
--- a/src/components/thread/ThreadView.tsx
+++ b/src/components/thread/ThreadView.tsx
@@ -45,7 +45,8 @@ function RootNote({ event }: { event: NDKEvent }) {
 export function ThreadView() {
   const { selectedNote, goBack } = useUIStore();
   const { loggedIn } = useUserStore();
-  const event = selectedNote!;
+  if (!selectedNote) { goBack(); return null; }
+  const event = selectedNote;
 
   const [replies, setReplies] = useState<NDKEvent[]>([]);
   const [loading, setLoading] = useState(true);
diff --git a/src/lib/nostr/client.ts b/src/lib/nostr/client.ts
index 0da76d4..af79490 100644
--- a/src/lib/nostr/client.ts
+++ b/src/lib/nostr/client.ts
@@ -61,6 +61,25 @@ export async function fetchGlobalFeed(limit: number = 50): Promise<NDKEvent[]> {
   return Array.from(events).sort((a, b) => (b.created_at ?? 0) - (a.created_at ?? 0));
 }
 
+export async function publishProfile(fields: {
+  name?: string;
+  display_name?: string;
+  about?: string;
+  picture?: string;
+  banner?: string;
+  website?: string;
+  nip05?: string;
+  lud16?: string;
+}): Promise<void> {
+  const instance = getNDK();
+  if (!instance.signer) throw new Error("Not logged in");
+
+  const event = new NDKEvent(instance);
+  event.kind = 0;
+  event.content = JSON.stringify(fields);
+  await event.publish();
+}
+
 export async function publishArticle(opts: {
   title: string;
   content: string;
diff --git a/src/lib/nostr/index.ts b/src/lib/nostr/index.ts
index c670193..6ef2739 100644
--- a/src/lib/nostr/index.ts
+++ b/src/lib/nostr/index.ts
@@ -1 +1 @@
-export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishReaction, publishReply, fetchUserNotes, fetchProfile } from "./client";
+export { getNDK, connectToRelays, fetchGlobalFeed, fetchFollowFeed, fetchReplies, publishNote, publishArticle, publishProfile, publishReaction, publishReply, fetchUserNotes, fetchProfile } from "./client";
diff --git a/src/stores/ui.ts b/src/stores/ui.ts
index 7ac38df..f969d76 100644
--- a/src/stores/ui.ts
+++ b/src/stores/ui.ts
@@ -26,6 +26,9 @@ export const useUIStore = create<UIState>((set, get) => ({
   setView: (currentView) => set({ currentView }),
   openProfile: (pubkey) => set((s) => ({ currentView: "profile", selectedPubkey: pubkey, previousView: s.currentView as View })),
   openThread: (note, from) => set({ currentView: "thread", selectedNote: note, previousView: from }),
-  goBack: () => set((s) => ({ currentView: s.previousView, selectedNote: null })),
+  goBack: () => set((s) => ({
+    currentView: s.previousView !== s.currentView ? s.previousView : "feed",
+    selectedNote: null,
+  })),
   toggleSidebar: () => set((s) => ({ sidebarCollapsed: !s.sidebarCollapsed })),
 }));