diff --git a/trovedb/db.py b/trovedb/db.py
index e811028..72ee4c0 100644
--- a/trovedb/db.py
+++ b/trovedb/db.py
@@ -71,7 +71,7 @@ class Sqlite3Trove:
             con.commit()
         obj = cls(con)
         if initialize:
-            obj.write_blob(b"", NODE_ROOT_ID)
+            obj.write_blob(b"", NOTE_ROOT_ID)
         return obj
 
     def close(self):
@@ -103,6 +103,15 @@ class Sqlite3Trove:
             return None
         return bytes(row["data"]) if row["data"] is not None else b""
 
+    def get_mtime(self, object_id: int) -> datetime | None:
+        """Return the modified timestamp for an object, or None if not found."""
+        row = self._con.execute(
+            "SELECT modified FROM objects WHERE id = ?", (object_id,)
+        ).fetchone()
+        if row is None:
+            return None
+        return datetime.fromisoformat(row["modified"])
+
     def read_metadata(self, object_id: int, key: str) -> bytes | None:
         """Return raw metadata value for (uuid, key), or None if not found."""
         row = self._con.execute(
diff --git a/trovedb/fs.py b/trovedb/fs.py
index ff6eece..3f36792 100644
--- a/trovedb/fs.py
+++ b/trovedb/fs.py
@@ -1,6 +1,7 @@
 import os
 import sqlite3
 import tempfile
+import datetime as dt
 from pathlib import Path
 from typing import Optional, Dict, List, Self, Iterable
 from .trove import Note, Trove, TreeNote, BlobNote, Blob, Tree, BadNoteType, TreeEntry, NoteNotFound
@@ -24,6 +25,24 @@ class FSNote(Note):
             raise ValueError("Note not yet saved to disk")
         return self._inode
 
+    @property
+    def mtime(self):
+        """Return modification time as datetime."""
+        stat = self._path.stat()
+        return dt.datetime.fromtimestamp(stat.st_mtime, tz=dt.timezone.utc)
+
+    @property
+    def readonly(self) -> bool:
+        """Check if the note is readonly based on file permissions."""
+        if self._inode is None:
+            return False
+        return not os.access(self._path, os.W_OK)
+
+    @property
+    def mime(self) -> str:
+        """Return MIME type, defaulting to generic binary stream."""
+        return "application/octet-stream"
+
     @property
     def _path(self) -> Path:
         if self._fs_path is not None:
@@ -60,6 +79,11 @@ class FSBlobNote(FSNote, BlobNote):
             pass
 
 class FSTreeNote(FSNote, TreeNote):
+    @property
+    def mime(self) -> str:
+        """Return MIME type for directory/tree nodes."""
+        return "inode/directory"
+
     def link(self, name: str, note: Note):
         if not isinstance(note, FSBlobNote):
             raise BadNoteType("Only blob notes can be linked")
diff --git a/trovedb/fuse/server.py b/trovedb/fuse/server.py
index 2441314..f933972 100644
--- a/trovedb/fuse/server.py
+++ b/trovedb/fuse/server.py
@@ -194,20 +194,26 @@ class TroveFuseOps(pyfuse3.Operations):
         attr.st_nlink = 1
         attr.st_uid = os.getuid()
         attr.st_gid = os.getgid()
+
+        mtime_ns = int(note.mtime.timestamp() * 1e9)
         now_ns = int(time.time() * 1e9)
         attr.st_atime_ns = now_ns
-        attr.st_mtime_ns = now_ns
-        attr.st_ctime_ns = now_ns
+        attr.st_mtime_ns = mtime_ns
+        attr.st_ctime_ns = mtime_ns
         attr.generation = 0
         attr.entry_timeout = 5.0
         attr.attr_timeout = 5.0
+
+        # Determine permissions based on readonly property
         if is_tree:
-            attr.st_mode = stat.S_IFDIR | 0o755
+            mode = 0o755 if not note.readonly else 0o555
+            attr.st_mode = stat.S_IFDIR | mode
             attr.st_size = 0
             attr.st_blksize = 512
             attr.st_blocks = 0
         else:
-            attr.st_mode = stat.S_IFREG | 0o644
+            mode = 0o644 if not note.readonly else 0o444
+            attr.st_mode = stat.S_IFREG | mode
             attr.st_size = size
             attr.st_blksize = 512
             attr.st_blocks = (size + 511) // 512
diff --git a/trovedb/trove.py b/trovedb/trove.py
index c9d0be9..924331f 100644
--- a/trovedb/trove.py
+++ b/trovedb/trove.py
@@ -1,6 +1,7 @@
 from typing import Protocol, runtime_checkable, Optional, Dict, List, Self, NamedTuple, Iterable, TypedDict
 from uuid import UUID
 from pathlib import PurePosixPath
+import datetime as dt
 
 
 type ObjectId = int | str | UUID
@@ -26,11 +27,27 @@ class Note(Protocol):
     Protocol for a Note item.
     Represents access to an individual note's content and metadata.
     """
+
     @property
     def object_id(self) -> ObjectId:
         """The unique identifier for this note."""
         ...
 
+    @property
+    def mime(self) -> str:
+        """The MIME type of the note's content."""
+        ...
+
+    @property
+    def readonly(self) -> bool:
+        """Whether the note is read-only."""
+        ...
+
+    @property
+    def mtime(self) -> dt.datetime:
+        """The last modification time of the note."""
+        ...
+
     def get_raw_metadata(self, key: str) -> Optional[bytes]:
         """Retrieve metadata value for the given key."""
         ...
@@ -84,10 +101,12 @@ class Tree(Protocol):
         """Return all entries as {name: object_id}."""
         ...
 
-class BlobNote(Note, Blob):
+@runtime_checkable
+class BlobNote(Note, Blob, Protocol):
     """Blob Note"""
 
-class TreeNote(Note, Tree):
+@runtime_checkable
+class TreeNote(Note, Tree, Protocol):
     """Tree Note"""
 
 
diff --git a/trovedb/trovedb.py b/trovedb/trovedb.py
index 1cf2f2e..7141be4 100644
--- a/trovedb/trovedb.py
+++ b/trovedb/trovedb.py
@@ -8,6 +8,7 @@ tree serialization respectively.
 
 from typing import Optional, Self
 from pathlib import Path
+import datetime as dt
 
 from .db import Sqlite3Trove, NOTE_ROOT_ID
 from .tree import Tree as TreeData
@@ -30,6 +31,20 @@ class NoteImpl(Note):
     def object_id(self) -> int:
         return self._object_id
 
+    @property
+    def readonly(self) -> bool:
+        return False
+
+    @property
+    def mtime(self) -> dt.datetime:
+        """Return modification time as Unix timestamp, or None if not set."""
+        return self._db.get_mtime(self._object_id)
+
+    @property
+    def mime(self) -> str:
+        """Return MIME type, defaulting to generic binary stream."""
+        return "application/octet-stream"
+
     def get_raw_metadata(self, key: str) -> Optional[bytes]:
         return self._db.read_metadata(self._object_id, key)