diff --git a/snip/sync/discovery.py b/snip/sync/discovery.py
index 8b227b7..b92863d 100644
--- a/snip/sync/discovery.py
+++ b/snip/sync/discovery.py
@@ -1,7 +1,8 @@
 """mDNS/Bonjour peer discovery for local network."""
 
-import asyncio
+import json
 import socket
+from pathlib import Path
 from typing import Any
 
 from zeroconf import ServiceInfo, Zeroconf
@@ -11,15 +12,22 @@ class DiscoveryService:
     SERVICE_TYPE = "_snippets._tcp.local."
     SERVICE_NAME = "snip"
 
-    def __init__(self, port: int = 8765):
+    def __init__(self, port: int = 8765, peer_id: str | None = None):
         self.port = port
+        self.peer_id = peer_id or socket.gethostname()
         self.zeroconf = None
         self.service_info = None
+        self._peer_cache_file = Path("~/.snip/peers.json").expanduser()
 
-    def register(self, peer_id: str, host: str | None = None):
+    def register(self, peer_id: str | None = None, host: str | None = None):
         """Register this peer on the network."""
+        if peer_id is None:
+            peer_id = self.peer_id
         if host is None:
-            host = socket.gethostbyname(socket.gethostname())
+            try:
+                host = socket.gethostbyname(socket.gethostname())
+            except Exception:
+                host = "127.0.0.1"
 
         self.zeroconf = Zeroconf()
         self.service_info = ServiceInfo(
@@ -27,7 +35,7 @@ class DiscoveryService:
             f"{self.SERVICE_NAME}_{peer_id}.{self.SERVICE_TYPE}",
             addresses=[socket.inet_aton(host)],
             port=self.port,
-            properties={"peer_id": peer_id},
+            properties={"peer_id": peer_id.encode()},
         )
         self.zeroconf.register_service(self.service_info)
 
@@ -50,9 +58,12 @@ class DiscoveryService:
                             for addr in item.addresses:
                                 peer_host = socket.inet_ntoa(addr)
                                 peer_id = item.properties.get(b"peer_id", b"").decode()
+                                peer_name = item.name.replace(f".{self.SERVICE_TYPE}", "")
                                 peers.append({
                                     "peer_id": peer_id,
+                                    "peer_name": peer_name,
                                     "host": peer_host,
+                                    "addresses": [peer_host],
                                     "port": item.port,
                                 })
         except Exception:
@@ -62,19 +73,15 @@ class DiscoveryService:
 
         return peers
 
-    def discover_peers_async(self, timeout: float = 5.0) -> list[dict[str, Any]]:
-        """Async version of peer discovery."""
-        return asyncio.run(self._discover_async(timeout))
+    def save_peer_cache(self, peers: list[dict[str, Any]]):
+        """Save discovered peers to cache."""
+        self._peer_cache_file.parent.mkdir(parents=True, exist_ok=True)
+        with open(self._peer_cache_file, "w") as f:
+            json.dump(peers, f)
 
-    async def _discover_async(self, timeout: float) -> list[dict[str, Any]]:
-        peers = []
-        zeroconf = Zeroconf()
-
-        try:
-            await asyncio.sleep(timeout)
-        except Exception:
-            pass
-        finally:
-            zeroconf.close()
-
-        return peers
+    def load_peer_cache(self) -> list[dict[str, Any]]:
+        """Load cached peers."""
+        if self._peer_cache_file.exists():
+            with open(self._peer_cache_file, "r") as f:
+                return json.load(f)
+        return []
\ No newline at end of file