diff --git a/ngc_hs1.cpp b/ngc_hs1.cpp
index de6ea77..61c1abd 100644
--- a/ngc_hs1.cpp
+++ b/ngc_hs1.cpp
@@ -2,10 +2,35 @@
 
 #include <cstdint>
 #include <new>
-#include <unordered_map>
+#include <map>
+#include <list>
 
 struct _GroupID {
-}
+	std::array<uint8_t, TOX_GROUP_CHAT_ID_SIZE> data;
+
+	bool operator<(const _GroupID& rhs) const {
+		for (size_t i = 0; i < data.size(); i++) {
+			if (data[i] > rhs.data[i]) {
+				return false;
+			}
+		}
+		return true;
+	}
+};
+
+struct _PeerID {
+	std::array<uint8_t, TOX_GROUP_PEER_PUBLIC_KEY_SIZE> data;
+
+	bool operator<(const _PeerID& rhs) const {
+		for (size_t i = 0; i < data.size(); i++) {
+			if (data[i] > rhs.data[i]) {
+				return false;
+			}
+		}
+		return true;
+	}
+};
+
 
 struct NGC_HS1 {
 	void* temp;
@@ -14,6 +39,28 @@ struct NGC_HS1 {
 
 	// key			- key			- key		- value store
 	// group pubkey - peer pubkey	- msg_id	- message(type + text)
+	struct Message {
+		uint32_t msg_id{};
+		Tox_Message_Type type;
+		std::string text;
+	};
+
+	struct Messages {
+		std::map<uint32_t, Message> dict;
+		std::list<uint32_t> order; // ordered list of message ids
+
+		void append(uint32_t msg_id, Tox_Message_Type type, const std::string& text) {
+			order.push_back(msg_id);
+
+			// overwrites
+			auto& new_msg = dict[msg_id];
+			new_msg.msg_id = msg_id;
+			new_msg.type = type;
+			new_msg.text = text;
+		}
+	};
+
+	std::map<_GroupID, std::map<_PeerID, Messages>> history;
 };
 
 NGC_HS1* NGC_HS1_new(const struct NGC_HS1_options* options) {
@@ -44,13 +91,13 @@ bool NGC_HS1_shim_group_send_message(
 ) {
 	uint32_t* msg_id_ptr = message_id;
 	uint32_t msg_id_placeholder = 0;
-	if (msg_id_ptr == NULL) {
+	if (msg_id_ptr == nullptr) {
 		msg_id_ptr = &msg_id_placeholder;
 	}
 
 	bool ret = tox_group_send_message(tox, group_number, type, message, length, msg_id_ptr, error);
 
-	NGC_HS1_record_own_message(tox, group_number, type, message, length, *msg_id_ptr);
+	NGC_HS1_record_own_message(tox, ngc_hs1_ctx, group_number, type, message, length, *msg_id_ptr);
 
 	return ret;
 }
@@ -66,5 +113,18 @@ void NGC_HS1_record_own_message(
 	Tox_Message_Type type, const uint8_t *message, size_t length, uint32_t message_id
 ) {
 	printf("record_own_message %u\n", message_id);
+	// get group id
+	_GroupID g_id{};
+	{ // TODO: error
+		tox_group_get_chat_id(tox, group_number, g_id.data.data(), nullptr);
+	}
+
+	// get peer id
+	_PeerID p_id{};
+	{ // TODO: error
+		tox_group_self_get_public_key(tox, group_number, p_id.data.data(), nullptr);
+	}
+
+	ngc_hs1_ctx->history[g_id];
 }
 
diff --git a/ngc_hs1.h b/ngc_hs1.h
index 57cf31b..29180eb 100644
--- a/ngc_hs1.h
+++ b/ngc_hs1.h
@@ -39,7 +39,7 @@ struct NGC_HS1_options {
 	// 2 mods
 	// 3 founders
 	// 4 no one (above founder)
-	uint8_t default_trust_level = 2;
+	uint8_t default_trust_level /*= 2*/;
 
 	//bool test;
 };