diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ea5ef87..c26a40f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,6 +4,9 @@ add_library(fragment_store
 	./fragment_store/file2_zstd.hpp
 	./fragment_store/file2_zstd.cpp
 
+	./fragment_store/uuid_generator.hpp
+	./fragment_store/uuid_generator.cpp
+
 	./fragment_store/fragment_store_i.hpp
 	./fragment_store/fragment_store_i.cpp
 	./fragment_store/types.hpp
diff --git a/src/fragment_store/fragment_store.cpp b/src/fragment_store/fragment_store.cpp
index 17830d8..450a016 100644
--- a/src/fragment_store/fragment_store.cpp
+++ b/src/fragment_store/fragment_store.cpp
@@ -32,75 +32,17 @@ static const char* metaFileTypeSuffix(MetaFileType mft) {
 }
 
 FragmentStore::FragmentStore(void) {
-	{ // random namespace
-		const auto num0 = _rng();
-		const auto num1 = _rng();
-		const auto num2 = _rng();
-		const auto num3 = _rng();
-
-		_session_uuid_namespace[0+0] = (num0 >> 0) & 0xff;
-		_session_uuid_namespace[0+1] = (num0 >> 8) & 0xff;
-		_session_uuid_namespace[0+2] = (num0 >> 16) & 0xff;
-		_session_uuid_namespace[0+3] = (num0 >> 24) & 0xff;
-
-		_session_uuid_namespace[4+0] = (num1 >> 0) & 0xff;
-		_session_uuid_namespace[4+1] = (num1 >> 8) & 0xff;
-		_session_uuid_namespace[4+2] = (num1 >> 16) & 0xff;
-		_session_uuid_namespace[4+3] = (num1 >> 24) & 0xff;
-
-		_session_uuid_namespace[8+0] = (num2 >> 0) & 0xff;
-		_session_uuid_namespace[8+1] = (num2 >> 8) & 0xff;
-		_session_uuid_namespace[8+2] = (num2 >> 16) & 0xff;
-		_session_uuid_namespace[8+3] = (num2 >> 24) & 0xff;
-
-		_session_uuid_namespace[12+0] = (num3 >> 0) & 0xff;
-		_session_uuid_namespace[12+1] = (num3 >> 8) & 0xff;
-		_session_uuid_namespace[12+2] = (num3 >> 16) & 0xff;
-		_session_uuid_namespace[12+3] = (num3 >> 24) & 0xff;
-	}
 	registerSerializers();
 }
 
 FragmentStore::FragmentStore(
 	std::array<uint8_t, 16> session_uuid_namespace
-) : _session_uuid_namespace(std::move(session_uuid_namespace)) {
+) : _session_uuid_gen(std::move(session_uuid_namespace)) {
 	registerSerializers();
 }
 
-std::vector<uint8_t> FragmentStore::generateNewUID(std::array<uint8_t, 16>& uuid_namespace) {
-	std::vector<uint8_t> new_uid(uuid_namespace.cbegin(), uuid_namespace.cend());
-	new_uid.resize(new_uid.size() + 16);
-
-	const auto num0 = _rng();
-	const auto num1 = _rng();
-	const auto num2 = _rng();
-	const auto num3 = _rng();
-
-	new_uid[uuid_namespace.size()+0] = (num0 >> 0) & 0xff;
-	new_uid[uuid_namespace.size()+1] = (num0 >> 8) & 0xff;
-	new_uid[uuid_namespace.size()+2] = (num0 >> 16) & 0xff;
-	new_uid[uuid_namespace.size()+3] = (num0 >> 24) & 0xff;
-
-	new_uid[uuid_namespace.size()+4+0] = (num1 >> 0) & 0xff;
-	new_uid[uuid_namespace.size()+4+1] = (num1 >> 8) & 0xff;
-	new_uid[uuid_namespace.size()+4+2] = (num1 >> 16) & 0xff;
-	new_uid[uuid_namespace.size()+4+3] = (num1 >> 24) & 0xff;
-
-	new_uid[uuid_namespace.size()+8+0] = (num2 >> 0) & 0xff;
-	new_uid[uuid_namespace.size()+8+1] = (num2 >> 8) & 0xff;
-	new_uid[uuid_namespace.size()+8+2] = (num2 >> 16) & 0xff;
-	new_uid[uuid_namespace.size()+8+3] = (num2 >> 24) & 0xff;
-
-	new_uid[uuid_namespace.size()+12+0] = (num3 >> 0) & 0xff;
-	new_uid[uuid_namespace.size()+12+1] = (num3 >> 8) & 0xff;
-	new_uid[uuid_namespace.size()+12+2] = (num3 >> 16) & 0xff;
-	new_uid[uuid_namespace.size()+12+3] = (num3 >> 24) & 0xff;
-
-	return new_uid;
-}
-
 std::vector<uint8_t> FragmentStore::generateNewUID(void) {
-	return generateNewUID(_session_uuid_namespace);
+	return _session_uuid_gen();
 }
 
 FragmentID FragmentStore::newFragmentMemoryOwned(
diff --git a/src/fragment_store/fragment_store.hpp b/src/fragment_store/fragment_store.hpp
index 0e52e51..26c5204 100644
--- a/src/fragment_store/fragment_store.hpp
+++ b/src/fragment_store/fragment_store.hpp
@@ -7,6 +7,8 @@
 
 #include "./serializer.hpp"
 
+#include "./uuid_generator.hpp"
+
 #include <entt/core/type_info.hpp>
 #include <entt/entity/registry.hpp>
 
@@ -18,8 +20,7 @@
 #include <random>
 
 struct FragmentStore : public FragmentStoreI {
-	std::minstd_rand _rng{std::random_device{}()};
-	std::array<uint8_t, 16> _session_uuid_namespace;
+	UUIDGenerator_128_128 _session_uuid_gen;
 
 	std::string _default_store_path;
 
@@ -34,7 +35,6 @@ struct FragmentStore : public FragmentStoreI {
 	// TODO: make the frags ref counted
 
 	// TODO: check for exising
-	std::vector<uint8_t> generateNewUID(std::array<uint8_t, 16>& uuid_namespace);
 	std::vector<uint8_t> generateNewUID(void);
 
 	// ========== new fragment ==========
diff --git a/src/fragment_store/uuid_generator.cpp b/src/fragment_store/uuid_generator.cpp
new file mode 100644
index 0000000..cc07985
--- /dev/null
+++ b/src/fragment_store/uuid_generator.cpp
@@ -0,0 +1,68 @@
+#include "./uuid_generator.hpp"
+
+UUIDGenerator_128_128::UUIDGenerator_128_128(void) {
+	{ // random namespace
+		const auto num0 = _rng();
+		const auto num1 = _rng();
+		const auto num2 = _rng();
+		const auto num3 = _rng();
+
+		_uuid_namespace[0+0] = (num0 >> 0) & 0xff;
+		_uuid_namespace[0+1] = (num0 >> 8) & 0xff;
+		_uuid_namespace[0+2] = (num0 >> 16) & 0xff;
+		_uuid_namespace[0+3] = (num0 >> 24) & 0xff;
+
+		_uuid_namespace[4+0] = (num1 >> 0) & 0xff;
+		_uuid_namespace[4+1] = (num1 >> 8) & 0xff;
+		_uuid_namespace[4+2] = (num1 >> 16) & 0xff;
+		_uuid_namespace[4+3] = (num1 >> 24) & 0xff;
+
+		_uuid_namespace[8+0] = (num2 >> 0) & 0xff;
+		_uuid_namespace[8+1] = (num2 >> 8) & 0xff;
+		_uuid_namespace[8+2] = (num2 >> 16) & 0xff;
+		_uuid_namespace[8+3] = (num2 >> 24) & 0xff;
+
+		_uuid_namespace[12+0] = (num3 >> 0) & 0xff;
+		_uuid_namespace[12+1] = (num3 >> 8) & 0xff;
+		_uuid_namespace[12+2] = (num3 >> 16) & 0xff;
+		_uuid_namespace[12+3] = (num3 >> 24) & 0xff;
+	}
+}
+
+UUIDGenerator_128_128::UUIDGenerator_128_128(const std::array<uint8_t, 16>& uuid_namespace) :
+	_uuid_namespace(uuid_namespace)
+{
+}
+
+std::vector<uint8_t> UUIDGenerator_128_128::operator()(void) {
+	std::vector<uint8_t> new_uid(_uuid_namespace.cbegin(), _uuid_namespace.cend());
+	new_uid.resize(new_uid.size() + 16);
+
+	const auto num0 = _rng();
+	const auto num1 = _rng();
+	const auto num2 = _rng();
+	const auto num3 = _rng();
+
+	new_uid[_uuid_namespace.size()+0] = (num0 >> 0) & 0xff;
+	new_uid[_uuid_namespace.size()+1] = (num0 >> 8) & 0xff;
+	new_uid[_uuid_namespace.size()+2] = (num0 >> 16) & 0xff;
+	new_uid[_uuid_namespace.size()+3] = (num0 >> 24) & 0xff;
+
+	new_uid[_uuid_namespace.size()+4+0] = (num1 >> 0) & 0xff;
+	new_uid[_uuid_namespace.size()+4+1] = (num1 >> 8) & 0xff;
+	new_uid[_uuid_namespace.size()+4+2] = (num1 >> 16) & 0xff;
+	new_uid[_uuid_namespace.size()+4+3] = (num1 >> 24) & 0xff;
+
+	new_uid[_uuid_namespace.size()+8+0] = (num2 >> 0) & 0xff;
+	new_uid[_uuid_namespace.size()+8+1] = (num2 >> 8) & 0xff;
+	new_uid[_uuid_namespace.size()+8+2] = (num2 >> 16) & 0xff;
+	new_uid[_uuid_namespace.size()+8+3] = (num2 >> 24) & 0xff;
+
+	new_uid[_uuid_namespace.size()+12+0] = (num3 >> 0) & 0xff;
+	new_uid[_uuid_namespace.size()+12+1] = (num3 >> 8) & 0xff;
+	new_uid[_uuid_namespace.size()+12+2] = (num3 >> 16) & 0xff;
+	new_uid[_uuid_namespace.size()+12+3] = (num3 >> 24) & 0xff;
+
+	return new_uid;
+}
+
diff --git a/src/fragment_store/uuid_generator.hpp b/src/fragment_store/uuid_generator.hpp
new file mode 100644
index 0000000..755e3be
--- /dev/null
+++ b/src/fragment_store/uuid_generator.hpp
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <vector>
+#include <array>
+#include <random>
+#include <cstdint>
+
+struct UUIDGeneratorI {
+	virtual std::vector<uint8_t> operator()(void) = 0;
+};
+
+struct UUIDGenerator_128_128 final : public UUIDGeneratorI {
+	private:
+		std::array<uint8_t, 16> _uuid_namespace;
+		std::minstd_rand _rng{std::random_device{}()};
+
+	public:
+		UUIDGenerator_128_128(void); // default randomly initializes namespace
+		UUIDGenerator_128_128(const std::array<uint8_t, 16>& uuid_namespace);
+
+		std::vector<uint8_t> operator()(void) override;
+};
+