diff --git a/storage/storage_server.go b/storage/storage_server.go
index 160db1b..3036e98 100644
--- a/storage/storage_server.go
+++ b/storage/storage_server.go
@@ -11,14 +11,14 @@ type StorageServer interface {
 	SetStorageRoot(path string)
 
 	// Block-level interactions
-	ChangeBlock(targetState world.BlockID, world_position world.BlockPos) error
+	ChangeBlock(pos world.BlockPos, targetState world.BlockID) error
 	ReadBlockAt(pos world.BlockPos) (world.BlockID, error)
 
 	// Region-level interactions
 	ChangeBlockRange(targetState world.BlockID, start, end world.BlockPos) error
 
 	// Network-level operations
-	ReadChunkAt(pos world.ChunkPos) error
+	ReadChunkAt(pos world.ChunkPos) (world.ChunkData, error)
 }
 
 var (