diff --git a/src/bctklib/bctklib.csproj b/src/bctklib/bctklib.csproj
index 11495a8..69f0247 100644
--- a/src/bctklib/bctklib.csproj
+++ b/src/bctklib/bctklib.csproj
@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <AssemblyName>neo-bctklib</AssemblyName>
     <Authors>The Neo Project</Authors>
     <Company>The Neo Project</Company>
diff --git a/src/bctklib/persistence/Extensions.cs b/src/bctklib/persistence/Extensions.cs
index ea1ad7e..c930778 100644
--- a/src/bctklib/persistence/Extensions.cs
+++ b/src/bctklib/persistence/Extensions.cs
@@ -29,12 +29,12 @@ public static ColumnFamilyHandle GetOrCreateColumnFamily(this RocksDb db, string
 
             if (direction == SeekDirection.Forward)
             {
-                Seek(iterator, prefix);
+                iterator.Seek(prefix);
                 return SeekInternal(iterator, iterator.Next);
             }
             else
             {
-                SeekForPrev(iterator, prefix);
+                iterator.SeekForPrev(prefix);
                 return SeekInternal(iterator, iterator.Prev);
             }
 
@@ -49,22 +49,6 @@ public static ColumnFamilyHandle GetOrCreateColumnFamily(this RocksDb db, string
                     }
                 }
             }
-
-            unsafe static Iterator Seek(Iterator @this, ReadOnlySpan<byte> prefix)
-            {
-                fixed (byte* prefixPtr = prefix)
-                {
-                    return @this.Seek(prefixPtr, (ulong)prefix.Length);
-                }
-            }
-
-            unsafe static Iterator SeekForPrev(Iterator @this, ReadOnlySpan<byte> prefix)
-            {
-                fixed (byte* prefixPtr = prefix)
-                {
-                    return @this.SeekForPrev(prefixPtr, (ulong)prefix.Length);
-                }
-            }
         }
 
         public static byte[]? TryGet(this TrackingMap trackingMap, IReadOnlyStore store, byte[]? key)