diff --git a/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java b/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java
new file mode 100644
index 00000000..1e24a762
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data;
+
+public interface LacertaLibrary {
+}
diff --git a/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
new file mode 100644
index 00000000..b3e9c855
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data.impl;
+
+public class LacertaLibraryImpl {
+}
diff --git a/data/src/main/java/one/nem/lacerta/data/module/LacertaLibraryModule.java b/data/src/main/java/one/nem/lacerta/data/module/LacertaLibraryModule.java
new file mode 100644
index 00000000..889a66ef
--- /dev/null
+++ b/data/src/main/java/one/nem/lacerta/data/module/LacertaLibraryModule.java
@@ -0,0 +1,4 @@
+package one.nem.lacerta.data.module;
+
+public class LacertaLibraryModule {
+}