diff --git a/internal/ipc/ipc.go b/internal/ipc/ipc.go
index 3a75ca0..e98aee2 100644
--- a/internal/ipc/ipc.go
+++ b/internal/ipc/ipc.go
@@ -459,6 +459,22 @@ func stateSnapshot(mgr *netmgr.Manager) proto.IpcMessage {
 				msg.Rooms = append(msg.Rooms, r)
 			}
 		}
+		// Include all historically-known peers so the UI can resolve aliases in history.
+		if known, err := all[0].Store.KnownPeers(); err == nil {
+			connected := map[proto.PeerID]bool{}
+			for _, p := range msg.ConnectedPeers {
+				connected[p.ID] = true
+			}
+			for id, alias := range known {
+				if connected[id] {
+					continue // already in ConnectedPeers
+				}
+				msg.KnownPeers = append(msg.KnownPeers, proto.PeerInfo{
+					ID:    id,
+					Alias: alias,
+				})
+			}
+		}
 	}
 
 	return msg
diff --git a/internal/proto/proto.go b/internal/proto/proto.go
index 418cee2..432fb02 100644
--- a/internal/proto/proto.go
+++ b/internal/proto/proto.go
@@ -350,6 +350,7 @@ type IpcMessage struct {
 	MasterID       string        `json:"master_id,omitempty"`    // daemon's master public key hex
 	LocalPeer      *PeerInfo     `json:"local_peer,omitempty"`
 	ConnectedPeers []PeerInfo    `json:"connected_peers,omitempty"`
+	KnownPeers     []PeerInfo    `json:"known_peers,omitempty"` // historically seen, not currently connected
 	Rooms          []string      `json:"rooms,omitempty"`
 	// multi-network: all joined networks (additive)
 	Networks       []NetworkInfo `json:"networks,omitempty"`
diff --git a/web/src/App.css b/web/src/App.css
index e286821..8d48852 100644
--- a/web/src/App.css
+++ b/web/src/App.css
@@ -88,7 +88,7 @@ details summary { color: var(--muted); font-size: 12px; cursor: pointer; }
 .messages { flex: 1; overflow-y: auto; padding: 8px 0; display: flex; flex-direction: column; }
 .message { display: flex; align-items: baseline; gap: 0; padding: 2px 16px; line-height: 1.5; }
 .message:hover { background: rgba(255,255,255,0.02); }
-.message-ts { color: var(--muted); font-size: 11px; white-space: nowrap; flex-shrink: 0; width: 52px; }
+.message-ts { color: var(--muted); font-size: 11px; white-space: nowrap; flex-shrink: 0; width: 72px; }
 .message-alias { font-weight: 600; font-size: 13px; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex-shrink: 0; width: 90px; padding-right: 10px; }
 .message.mine .message-alias { color: var(--accent); }
 .message-text { word-break: break-word; font-size: 14px; color: var(--text); }
diff --git a/web/src/components/MessagePane.tsx b/web/src/components/MessagePane.tsx
index b845887..c8330ac 100644
--- a/web/src/components/MessagePane.tsx
+++ b/web/src/components/MessagePane.tsx
@@ -4,17 +4,16 @@ import { useWaste } from '../store'
 const today = new Date()
 today.setHours(0, 0, 0, 0)
 const todayMs = today.getTime()
-const yesterdayMs = todayMs - 86400000
 
 function formatTs(ts: number): string {
-  const time = new Date(ts).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', hour12: false })
+  const d = new Date(ts)
+  const time = d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', hour12: false })
   if (ts >= todayMs) return time
-  if (ts >= yesterdayMs) return `Yesterday ${time}`
-  return new Date(ts).toLocaleDateString([], { month: 'short', day: 'numeric' }) + ' ' + time
+  return d.toLocaleDateString([], { month: 'short', day: 'numeric' }) + ' ' + time
 }
 
 export function MessagePane() {
-  const { messages, historyCutoff, activeRoom, activeNetworkId, localPeer, connectedPeers, send } = useWaste()
+  const { messages, historyCutoff, activeRoom, activeNetworkId, localPeer, connectedPeers, knownPeers, send } = useWaste()
   const [draft, setDraft] = useState('')
   const bottomRef = useRef<HTMLDivElement>(null)
   const roomMessages = messages[activeRoom] ?? []
@@ -53,7 +52,9 @@ export function MessagePane() {
 
   function aliasFor(fromId: string) {
     if (fromId === localPeer?.id) return localPeer.alias
-    return connectedPeers.find(p => p.id === fromId)?.alias ?? fromId.slice(0, 8)
+    return connectedPeers.find(p => p.id === fromId)?.alias
+      ?? knownPeers[fromId]
+      ?? fromId.slice(0, 8)
   }
 
   const roomLabel = activeRoom.startsWith('dm:')
diff --git a/web/src/store/index.ts b/web/src/store/index.ts
index 66b185f..e719cdb 100644
--- a/web/src/store/index.ts
+++ b/web/src/store/index.ts
@@ -29,6 +29,7 @@ interface WasteState {
 
   // peers
   connectedPeers: PeerInfo[]
+  knownPeers: Record<string, string> // id → alias for historical peers
 
   // chat — keyed by room
   messages: Record<string, ChatMessage[]>
@@ -87,6 +88,7 @@ export const useWaste = create<WasteState>((set, get) => ({
   networks: [],
   activeNetworkId: null,
   connectedPeers: [],
+  knownPeers: {},
   messages: {},
   historyCutoff: {},
   activeRoom: 'general',
@@ -215,6 +217,8 @@ export const useWaste = create<WasteState>((set, get) => ({
     switch (msg.type) {
       case 'state_snapshot': {
         const networks = msg.networks ?? []
+        const knownPeers: Record<string, string> = {}
+        for (const p of msg.known_peers ?? []) knownPeers[p.id] = p.alias
         set({
           masterAlias: msg.master_alias ?? null,
           masterId: msg.master_id ?? null,
@@ -222,6 +226,7 @@ export const useWaste = create<WasteState>((set, get) => ({
           networks,
           connectedPeers: msg.connected_peers ?? [],
           activeNetworkId: networks[0]?.network_id ?? null,
+          knownPeers,
         })
         break
       }
diff --git a/web/src/types.ts b/web/src/types.ts
index 57ab887..4f2e600 100644
--- a/web/src/types.ts
+++ b/web/src/types.ts
@@ -117,6 +117,7 @@ export interface IpcMessage {
   master_id?: string
   local_peer?: PeerInfo
   connected_peers?: PeerInfo[]
+  known_peers?: PeerInfo[]
   rooms?: string[]
   networks?: NetworkInfo[]
   error_message?: string