diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index af0da59..b297c58 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -33,6 +33,7 @@ target_compile_features(totato PUBLIC cxx_std_17)
 target_link_libraries(totato PUBLIC
 	solanaceae_util
 	solanaceae_contact
+	solanaceae_contact_impl
 	solanaceae_message3
 
 	solanaceae_plugin
diff --git a/src/config_commands.cpp b/src/config_commands.cpp
index 0baec0a..744510a 100644
--- a/src/config_commands.cpp
+++ b/src/config_commands.cpp
@@ -1,6 +1,6 @@
 #include "./managment_commands.hpp"
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/contact_store_i.hpp>
 #include <solanaceae/util/config_model.hpp>
 
 #include <solanaceae/message3/message_command_dispatcher.hpp>
@@ -13,7 +13,7 @@
 void registerConfigCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 ) {
 	mcd.registerCommand(
diff --git a/src/config_commands.hpp b/src/config_commands.hpp
index 45260a5..1e2f6e1 100644
--- a/src/config_commands.hpp
+++ b/src/config_commands.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/fwd.hpp>
 #include <solanaceae/message3/registry_message_model.hpp>
 
 // fwd
@@ -10,7 +10,7 @@ struct ConfigModelI;
 void registerConfigCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 );
 
diff --git a/src/fun_commands.cpp b/src/fun_commands.cpp
index a3786a1..1379811 100644
--- a/src/fun_commands.cpp
+++ b/src/fun_commands.cpp
@@ -1,18 +1,19 @@
 #include "./managment_commands.hpp"
 
-#include <random>
-#include <solanaceae/contact/contact_model3.hpp>
 //#include <solanaceae/util/config_model.hpp>
+#include <solanaceae/contact/contact_store_i.hpp>
 
 #include <solanaceae/message3/message_command_dispatcher.hpp>
 
-#include <solanaceae/message3/components.hpp>
 //#include <solanaceae/contact/components.hpp>
+#include <solanaceae/message3/components.hpp>
+
+#include <random>
 
 void registerFunCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 ) {
 	mcd.registerCommand(
diff --git a/src/fun_commands.hpp b/src/fun_commands.hpp
index 81c159a..bbccbb2 100644
--- a/src/fun_commands.hpp
+++ b/src/fun_commands.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <solanaceae/contact/contact_model3.hpp>
 #include <solanaceae/message3/registry_message_model.hpp>
 
 // fwd
@@ -10,7 +9,7 @@ struct ConfigModelI;
 void registerFunCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 );
 
diff --git a/src/main.cpp b/src/main.cpp
index ea78c68..dc036b1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,6 @@
 #include <solanaceae/object_store/object_store.hpp>
 #include <solanaceae/util/simple_config_model.hpp>
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/contact_store_impl.hpp>
 #include <solanaceae/message3/registry_message_model_impl.hpp>
 #include <solanaceae/message3/message_time_sort.hpp>
 #include <solanaceae/plugin/plugin_manager.hpp>
@@ -185,11 +185,11 @@ int main(int argc, char** argv) {
 		// TODO: name
 	}
 
-	Contact3Registry cr;
-	RegistryMessageModelImpl rmm{cr};
+	ContactStore4Impl cs;
+	RegistryMessageModelImpl rmm{cs};
 	MessageTimeSort mts{rmm};
-	MessageCleanser mc{cr, rmm, conf};
-	MessageCommandDispatcher mcd{cr, rmm, conf};
+	MessageCleanser mc{cs, rmm, conf};
+	MessageCommandDispatcher mcd{cs, rmm, conf};
 
 	{ // setup basic commands for bot
 		mcd.registerCommand(
@@ -223,9 +223,9 @@ int main(int argc, char** argv) {
 
 	ToxPrivateImpl tpi{tc.getTox()};
 	AutoDirty ad{tc};
-	ToxContactModel2 tcm{cr, tc, tc};
-	ToxMessageManager tmm{rmm, cr, tcm, tc, tc};
-	ToxTransferManager ttm{rmm, cr, tcm, tc, tc, os};
+	ToxContactModel2 tcm{cs, tc, tc};
+	ToxMessageManager tmm{rmm, cs, tcm, tc, tc};
+	ToxTransferManager ttm{rmm, cs, tcm, tc, tc, os};
 
 	PluginManager pm;
 
@@ -233,7 +233,7 @@ int main(int argc, char** argv) {
 		g_provideInstance<ObjectStore2>("ObjectStore2", "host", &os);
 
 		g_provideInstance<ConfigModelI>("ConfigModelI", "host", &conf);
-		g_provideInstance<Contact3Registry>("Contact3Registry", "1", "host", &cr);
+		g_provideInstance<ContactStore4I>("ContactStore4I", "host", &cs);
 		g_provideInstance<RegistryMessageModelI>("RegistryMessageModelI", "host", &rmm);
 		g_provideInstance<MessageCommandDispatcher>("MessageCommandDispatcher", "host", &mcd);
 
@@ -267,11 +267,11 @@ int main(int argc, char** argv) {
 		}
 	}
 
-	registerManagementCommands(mcd, conf, cr, rmm);
+	registerManagementCommands(mcd, conf, cs, rmm);
 	// TODO: finish impl
-	//registerConfigCommands(mcd, conf, cr, rmm);
-	registerToxCommands(mcd, conf, cr, rmm, tc, tpi);
-	registerFunCommands(mcd, conf, cr, rmm);
+	//registerConfigCommands(mcd, conf, cs, rmm);
+	registerToxCommands(mcd, conf, cs, rmm, tc, tpi);
+	registerFunCommands(mcd, conf, cs, rmm);
 
 	mcd.registerCommand(
 		"totato", "",
diff --git a/src/managment_commands.cpp b/src/managment_commands.cpp
index 9a51a12..b3982e8 100644
--- a/src/managment_commands.cpp
+++ b/src/managment_commands.cpp
@@ -1,6 +1,6 @@
 #include "./managment_commands.hpp"
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/contact_store_i.hpp>
 #include <solanaceae/util/config_model.hpp>
 
 #include <solanaceae/message3/message_command_dispatcher.hpp>
@@ -12,25 +12,22 @@
 #include <iostream>
 #include <algorithm>
 
-static std::optional<Contact3> getContactFromIDStr(
-	Contact3Registry& cr,
+static std::optional<Contact4> getContactFromIDStr(
+	ContactStore4I& cs,
 	std::string_view id_str
 ) {
-	const std::vector<uint8_t> id = hex2bin(std::string{id_str});
-	const auto view = cr.view<Contact::Components::ID>();
-	const auto found_contact = std::find_if(view.begin(), view.end(), [&id, &view](const Contact3 c) -> bool {
-		return view.get<Contact::Components::ID>(c).data == id;
-	});
+	const std::vector<uint8_t> id = hex2bin(id_str);
+	const auto found_contact = cs.getOneContactByID(ByteSpan{id});
 
-	if (found_contact != view.end()) {
-		return *found_contact;
+	if (static_cast<bool>(found_contact)) {
+		return found_contact;
 	} else {
 		return std::nullopt;
 	}
 }
 
 static std::string getStatusFromContact(
-	Contact3Handle c
+	ContactHandle4 c
 ) {
 	std::string status_str;
 
@@ -53,7 +50,7 @@ static std::string getStatusFromContact(
 
 bool handleContactAddToGroup(
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm,
 
 	std::string_view params,
@@ -73,7 +70,7 @@ bool handleContactAddToGroup(
 		return true;
 	}
 
-	const auto target_opt = getContactFromIDStr(cr, params);
+	const auto target_opt = getContactFromIDStr(cs, params);
 	if (!target_opt.has_value()) {
 		rmm.sendText(
 			contact_from,
@@ -99,7 +96,7 @@ bool handleContactAddToGroup(
 	reply += "' to the ";
 	reply += group;
 	reply += "s.\n";
-	reply += getStatusFromContact(Contact3Handle{cr, target_opt.value()});
+	reply += getStatusFromContact(cs.contactHandle(target_opt.value()));
 
 	rmm.sendText(
 		contact_from,
@@ -112,14 +109,14 @@ bool handleContactAddToGroup(
 void registerManagementCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 ) {
 	mcd.registerCommand(
 		"Management", "manage",
 		"admin-add",
 		[&](std::string_view params, Message3Handle m) -> bool {
-			return handleContactAddToGroup(conf, cr, rmm, params, m, "admin");
+			return handleContactAddToGroup(conf, cs, rmm, params, m, "admin");
 		},
 		"Add an admin by ID.",
 		MessageCommandDispatcher::Perms::ADMIN
@@ -129,7 +126,7 @@ void registerManagementCommands(
 		"Management", "manage",
 		"mod-add",
 		[&](std::string_view params, Message3Handle m) -> bool {
-			return handleContactAddToGroup(conf, cr, rmm, params, m, "moderator");
+			return handleContactAddToGroup(conf, cs, rmm, params, m, "moderator");
 		},
 		"Add a moderator by ID.",
 		MessageCommandDispatcher::Perms::ADMIN
diff --git a/src/managment_commands.hpp b/src/managment_commands.hpp
index 08841cb..6efd7d5 100644
--- a/src/managment_commands.hpp
+++ b/src/managment_commands.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/fwd.hpp>
 #include <solanaceae/message3/registry_message_model.hpp>
 
 // fwd
@@ -10,7 +10,7 @@ struct ConfigModelI;
 void registerManagementCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm
 );
 
diff --git a/src/message_cleanser.cpp b/src/message_cleanser.cpp
index 5ccc42e..24a9ef5 100644
--- a/src/message_cleanser.cpp
+++ b/src/message_cleanser.cpp
@@ -1,5 +1,6 @@
 #include "./message_cleanser.hpp"
 
+#include <solanaceae/contact/contact_store_i.hpp>
 #include <solanaceae/contact/components.hpp>
 #include <solanaceae/message3/components.hpp>
 #include <solanaceae/util/utils.hpp>
@@ -9,10 +10,10 @@
 #include <cstdint>
 
 MessageCleanser::MessageCleanser(
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm,
 	ConfigModelI& conf
-) : _cr(cr), _rmm(rmm), _conf(conf) {
+) : _cs(cs), _rmm(rmm), _conf(conf) {
 	if (!_conf.has_int("MessageCleanser", "old_age_minutes")) {
 		_conf.set("MessageCleanser", "old_age_minutes", int64_t(_old_age_default));
 	}
@@ -30,15 +31,17 @@ float MessageCleanser::iterate(float time_delta) {
 
 		uint64_t now_ts = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
 
+		const auto& cr = _cs.registry();
+
 		// TODO: iterate rmm directly
 		//_rmm.get();
 		// workaround by iterating contacts
-		for (const auto& c : _cr.view<Contact::Components::TagBig>()) {
+		for (const auto& c : cr.view<Contact::Components::TagBig>()) {
 			if (auto* reg = _rmm.get(c); reg != nullptr) {
 				float old_age {0.f};
 				{ // old age from conf
 					// TODO: find some way to extract this (maybe map into contact reg?)
-					if (const auto* id_comp = _cr.try_get<Contact::Components::ID>(c); id_comp != nullptr) {
+					if (const auto* id_comp = cr.try_get<Contact::Components::ID>(c); id_comp != nullptr) {
 						const auto id_hex = bin2hex(id_comp->data);
 						old_age = _conf.get_int("MessageCleanser", "old_age_minutes", id_hex).value_or(_old_age_default);
 					} else {
diff --git a/src/message_cleanser.hpp b/src/message_cleanser.hpp
index 7d222c0..b71c7d7 100644
--- a/src/message_cleanser.hpp
+++ b/src/message_cleanser.hpp
@@ -4,7 +4,7 @@
 #include <solanaceae/util/config_model.hpp>
 
 class MessageCleanser {
-	Contact3Registry& _cr;
+	ContactStore4I& _cs;
 	RegistryMessageModelI& _rmm;
 	ConfigModelI& _conf;
 
@@ -15,7 +15,7 @@ class MessageCleanser {
 
 	public:
 		MessageCleanser(
-			Contact3Registry& cr,
+			ContactStore4I& cs,
 			RegistryMessageModelI& rmm,
 			ConfigModelI& conf
 		);
diff --git a/src/tox_commands.cpp b/src/tox_commands.cpp
index 82e690d..2255d0b 100644
--- a/src/tox_commands.cpp
+++ b/src/tox_commands.cpp
@@ -1,6 +1,6 @@
 #include "./tox_commands.hpp"
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/contact_store_i.hpp>
 #include <solanaceae/util/config_model.hpp>
 #include <solanaceae/util/utils.hpp>
 #include <solanaceae/toxcore/tox_interface.hpp>
@@ -17,7 +17,7 @@
 void registerToxCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm,
 	ToxI& t,
 	ToxPrivateI& tp
@@ -43,6 +43,8 @@ void registerToxCommands(
 			reply += "\ndht-closenum-announce-capable:";
 			reply += std::to_string(tp.toxDHTGetNumCloselistAnnounceCapable());
 
+			const auto& cr = cs.registry();
+
 			if (cr.all_of<Contact::Components::ToxFriendEphemeral>(contact_from)) {
 				const auto con_opt = t.toxFriendGetConnectionStatus(cr.get<Contact::Components::ToxFriendEphemeral>(contact_from).friend_number);
 				if (!con_opt.has_value() || con_opt.value() == Tox_Connection::TOX_CONNECTION_NONE) {
@@ -174,6 +176,8 @@ void registerToxCommands(
 				return true;
 			}
 
+			const auto& cr = cs.registry();
+
 			// get current group
 			if (!cr.all_of<Contact::Components::Parent>(contact_from)) {
 				rmm.sendText(
diff --git a/src/tox_commands.hpp b/src/tox_commands.hpp
index 0ed03c3..57e2b85 100644
--- a/src/tox_commands.hpp
+++ b/src/tox_commands.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/contact/fwd.hpp>
 #include <solanaceae/message3/registry_message_model.hpp>
 
 // fwd
@@ -12,7 +12,7 @@ struct ToxPrivateI;
 void registerToxCommands(
 	MessageCommandDispatcher& mcd,
 	ConfigModelI& conf,
-	Contact3Registry& cr,
+	ContactStore4I& cs,
 	RegistryMessageModelI& rmm,
 	ToxI& t,
 	ToxPrivateI& tp