diff --git a/sandbox/btree/btree.c b/sandbox/btree/btree.c
new file mode 100644
index 0000000..53daab3
--- /dev/null
+++ b/sandbox/btree/btree.c
@@ -0,0 +1,37 @@
+#include "include/socks/btree.h"
+#include <socks/bree.h>
+
+static void insert_fixup(btree_t *tree, btree_node_t *node)
+{
+
+}
+
+void btree_insert(btree_t *tree, btree_node_t *node)
+{
+	if (!tree->b_root) {
+		tree->b_root = node;
+		return;
+	}
+
+	btree_node_t *cur = tree->b_root;
+	while (1) {
+		btree_node_t **nextp = NULL;
+		
+		if (node->b_key >= cur->b_key) {
+			nextp = &cur->b_right;
+		} else {
+			nextp = &cur->b_left;
+		}
+
+		if (*nextp) {
+			cur = *nextp;
+		} else {
+			*nextp = node;
+			break;
+		}
+	}
+
+	insert_fixup(tree, node);
+}
+
+void btree_delete(btree_t *tree, btree_node_t *node) {}
diff --git a/sandbox/btree/include/socks/btree.h b/sandbox/btree/include/socks/btree.h
new file mode 100644
index 0000000..7768215
--- /dev/null
+++ b/sandbox/btree/include/socks/btree.h
@@ -0,0 +1,21 @@
+#ifndef SOCKS_BTREE_H_
+#define SOCKS_BTREE_H_
+
+#include <stdint.h>
+
+typedef uint64_t btree_key_t;
+
+typedef struct btree_node {
+	struct btree_node *b_left, *b_right;
+	signed char b_bfactor;
+	btree_key_t b_key;
+} btree_node_t;
+
+typedef struct btree_t {
+	struct btree_node *b_root;
+} btree_t;
+
+extern void btree_insert(btree_t *tree, btree_node_t *node);
+extern void btree_delete(btree_t *tree, btree_node_t *node);
+
+#endif