diff --git a/CMakeLists.txt b/CMakeLists.txt
index deb61cc..0706aef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,6 +43,21 @@ target_link_libraries(solanaceae_ngcft1 PUBLIC
 
 ########################################
 
+add_library(solanaceae_ngchs2
+	./solanaceae/ngc_hs2/ngc_hs2.hpp
+	./solanaceae/ngc_hs2/ngc_hs2.cpp
+)
+target_include_directories(solanaceae_ngchs2 PUBLIC .)
+target_compile_features(solanaceae_ngchs2 PUBLIC cxx_std_17)
+target_link_libraries(solanaceae_ngchs2 PUBLIC
+	solanaceae_ngcft1
+	solanaceae_tox_contacts
+	solanaceae_message3
+	solanaceae_object_store
+)
+
+########################################
+
 add_library(solanaceae_sha1_ngcft1
 	# hacky deps
 	./solanaceae/ngc_ft1_sha1/mio.hpp
diff --git a/solanaceae/ngc_ft1/ngcft1_file_kind.hpp b/solanaceae/ngc_ft1/ngcft1_file_kind.hpp
index e4427b7..b4936c0 100644
--- a/solanaceae/ngc_ft1/ngcft1_file_kind.hpp
+++ b/solanaceae/ngc_ft1/ngcft1_file_kind.hpp
@@ -72,5 +72,23 @@ enum class NGCFT1_file_kind : uint32_t {
 	// id: sha256
 	// always of size 16KiB, except if last piece in file
 	TORRENT_V2_PIECE,
+
+	// https://gist.github.com/Green-Sky/440cd9817a7114786850eb4c62dc57c3
+	// id: ts start, ts end
+	// content:
+	//  - ts start (do we need this? when this is part of the id?)
+	//  - ts end (same)
+	//  - list size
+	//    - ppk
+	//    - mid
+	//    - ts
+	HS2_INFO_RANGE_TIME = 0x00000f00,
+	// TODO: half open ranges
+	// TODO: id based
+	// TODO: ppk based?
+
+	// id: ppk, mid, ts
+	HS2_SINGLE_MESSAGE,
+	// TODO: message pack
 };
 
diff --git a/solanaceae/ngc_hs2/ngc_hs2.cpp b/solanaceae/ngc_hs2/ngc_hs2.cpp
new file mode 100644
index 0000000..e9b2640
--- /dev/null
+++ b/solanaceae/ngc_hs2/ngc_hs2.cpp
@@ -0,0 +1,91 @@
+#include "./ngc_hs2.hpp"
+
+#include <solanaceae/tox_contacts/tox_contact_model2.hpp>
+
+NGCHS2::NGCHS2(
+	ToxContactModel2& tcm,
+	ToxEventProviderI& tep,
+	NGCFT1& nft
+) :
+	_tcm(tcm),
+	_tep_sr(tep.newSubRef(this)),
+	_nft(nft),
+	_nftep_sr(_nft.newSubRef(this))
+{
+	_tep_sr
+		.subscribe(TOX_EVENT_GROUP_PEER_JOIN)
+		.subscribe(TOX_EVENT_GROUP_PEER_EXIT)
+	;
+
+	_nftep_sr
+		.subscribe(NGCFT1_Event::recv_init)
+		.subscribe(NGCFT1_Event::recv_request)
+		.subscribe(NGCFT1_Event::recv_init)
+		.subscribe(NGCFT1_Event::recv_data)
+		.subscribe(NGCFT1_Event::send_data)
+		.subscribe(NGCFT1_Event::recv_done)
+		.subscribe(NGCFT1_Event::send_done)
+	;
+}
+
+NGCHS2::~NGCHS2(void) {
+}
+
+float NGCHS2::iterate(float delta) {
+	return 1000.f;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_recv_request& e) {
+	if (
+		e.file_kind != NGCFT1_file_kind::HS2_INFO_RANGE_TIME &&
+		e.file_kind != NGCFT1_file_kind::HS2_SINGLE_MESSAGE
+	) {
+		return false; // not for us
+	}
+
+	return false;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_recv_init& e) {
+	if (
+		e.file_kind != NGCFT1_file_kind::HS2_INFO_RANGE_TIME &&
+		e.file_kind != NGCFT1_file_kind::HS2_SINGLE_MESSAGE
+	) {
+		return false; // not for us
+	}
+
+	return false;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_recv_data&) {
+	return false;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_send_data&) {
+	return false;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_recv_done&) {
+	return false;
+}
+
+bool NGCHS2::onEvent(const Events::NGCFT1_send_done&) {
+	return false;
+}
+
+bool NGCHS2::onToxEvent(const Tox_Event_Group_Peer_Join* e) {
+	const auto group_number = tox_event_group_peer_join_get_group_number(e);
+	const auto peer_number = tox_event_group_peer_join_get_peer_id(e);
+
+	const auto c = _tcm.getContactGroupPeer(group_number, peer_number);
+	assert(c);
+
+	// add to check list with inital cooldown
+
+	return false;
+}
+
+bool NGCHS2::onToxEvent(const Tox_Event_Group_Peer_Exit* e) {
+	return false;
+}
+
diff --git a/solanaceae/ngc_hs2/ngc_hs2.hpp b/solanaceae/ngc_hs2/ngc_hs2.hpp
new file mode 100644
index 0000000..771203f
--- /dev/null
+++ b/solanaceae/ngc_hs2/ngc_hs2.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+//#include <solanaceae/contact/contact_model3.hpp>
+#include <solanaceae/toxcore/tox_event_interface.hpp>
+
+//#include <solanaceae/message3/registry_message_model.hpp>
+
+#include <solanaceae/ngc_ft1/ngcft1.hpp>
+
+// fwd
+class ToxContactModel2;
+
+class NGCHS2 : public ToxEventI, public NGCFT1EventI {
+	ToxContactModel2& _tcm;
+	//Contact3Registry& _cr;
+	//RegistryMessageModelI& _rmm;
+	ToxEventProviderI::SubscriptionReference _tep_sr;
+	NGCFT1& _nft;
+	NGCFT1EventProviderI::SubscriptionReference _nftep_sr;
+
+	public:
+		NGCHS2(
+			ToxContactModel2& tcm,
+			ToxEventProviderI& tep,
+			NGCFT1& nf
+		);
+
+		~NGCHS2(void);
+
+		float iterate(float delta);
+
+	protected:
+		bool onEvent(const Events::NGCFT1_recv_request&) override;
+		bool onEvent(const Events::NGCFT1_recv_init&) override;
+		bool onEvent(const Events::NGCFT1_recv_data&) override;
+		bool onEvent(const Events::NGCFT1_send_data&) override;
+		bool onEvent(const Events::NGCFT1_recv_done&) override;
+		bool onEvent(const Events::NGCFT1_send_done&) override;
+
+	protected:
+		bool onToxEvent(const Tox_Event_Group_Peer_Join* e) override;
+		bool onToxEvent(const Tox_Event_Group_Peer_Exit* e) override;
+};
+