diff --git a/CMakeLists.txt b/CMakeLists.txt
index 42082ab..10205af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,6 +54,9 @@ add_library(solanaceae_sha1_ngcft1
 	./solanaceae/ngc_ft1_sha1/ft1_sha1_info.hpp
 	./solanaceae/ngc_ft1_sha1/ft1_sha1_info.cpp
 
+	./solanaceae/ngc_ft1_sha1/components.hpp
+	./solanaceae/ngc_ft1_sha1/components.cpp
+
 	./solanaceae/ngc_ft1_sha1/sha1_ngcft1.hpp
 	./solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp
 )
diff --git a/solanaceae/ngc_ft1_sha1/components.cpp b/solanaceae/ngc_ft1_sha1/components.cpp
new file mode 100644
index 0000000..5fbf038
--- /dev/null
+++ b/solanaceae/ngc_ft1_sha1/components.cpp
@@ -0,0 +1,25 @@
+#include "./components.hpp"
+
+std::vector<size_t> Components::FT1ChunkSHA1Cache::chunkIndices(const SHA1Digest& hash) const {
+	const auto it = chunk_hash_to_index.find(hash);
+	if (it != chunk_hash_to_index.cend()) {
+		return it->second;
+	} else {
+		return {};
+	}
+}
+
+bool Components::FT1ChunkSHA1Cache::haveChunk(const SHA1Digest& hash) const {
+	if (have_all) { // short cut
+		return true;
+	}
+
+	if (auto i_vec = chunkIndices(hash); !i_vec.empty()) {
+		// TODO: should i test all?
+		return have_chunk[i_vec.front()];
+	}
+
+	// not part of this file
+	return false;
+}
+
diff --git a/solanaceae/ngc_ft1_sha1/components.hpp b/solanaceae/ngc_ft1_sha1/components.hpp
new file mode 100644
index 0000000..ea8b455
--- /dev/null
+++ b/solanaceae/ngc_ft1_sha1/components.hpp
@@ -0,0 +1,66 @@
+#pragma once
+
+#include <solanaceae/contact/components.hpp>
+#include <solanaceae/message3/components.hpp>
+#include <solanaceae/message3/registry_message_model.hpp>
+
+#include <entt/container/dense_set.hpp>
+
+#include "./ft1_sha1_info.hpp"
+#include "./hash_utils.hpp"
+
+
+#include <vector>
+
+
+// TODO: rename to object components
+namespace Components {
+
+	struct Messages {
+		std::vector<Message3Handle> messages;
+	};
+
+	using FT1InfoSHA1 = FT1InfoSHA1;
+
+	struct FT1InfoSHA1Data {
+		std::vector<uint8_t> data;
+	};
+
+	struct FT1InfoSHA1Hash {
+		std::vector<uint8_t> hash;
+	};
+
+	struct FT1ChunkSHA1Cache {
+		std::vector<bool> have_chunk;
+		bool have_all {false};
+		size_t have_count {0};
+		entt::dense_map<SHA1Digest, std::vector<size_t>> chunk_hash_to_index;
+
+		std::vector<size_t> chunkIndices(const SHA1Digest& hash) const;
+		bool haveChunk(const SHA1Digest& hash) const;
+	};
+
+	struct FT1ChunkSHA1Requested {
+		// requested chunks with a timer since last request
+		entt::dense_map<size_t, float> chunks;
+	};
+
+	// TODO: once announce is shipped, remove the "Suspected"
+	struct SuspectedParticipants {
+		entt::dense_set<Contact3> participants;
+	};
+
+	struct ReRequestInfoTimer {
+		float timer {0.f};
+	};
+
+	struct ReadHeadHint {
+		// points to the first byte we want
+		// this is just a hint, that can be set from outside
+		// to guide the sequential "piece picker" strategy
+		// the strategy *should* set this to the first byte we dont yet have
+		uint64_t offset_into_file {0u};
+	};
+
+} // Components
+
diff --git a/solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp b/solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp
index 83ea9af..03b7cb3 100644
--- a/solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp
+++ b/solanaceae/ngc_ft1_sha1/sha1_ngcft1.cpp
@@ -16,6 +16,8 @@
 
 #include "./file_rw_mapped.hpp"
 
+#include "./components.hpp"
+
 #include <iostream>
 #include <variant>
 #include <filesystem>
@@ -29,80 +31,6 @@ namespace Message::Components {
 
 } // Message::Components
 
-// TODO: rename to object components
-namespace Components {
-
-	struct Messages {
-		std::vector<Message3Handle> messages;
-	};
-
-	using FT1InfoSHA1 = FT1InfoSHA1;
-
-	struct FT1InfoSHA1Data {
-		std::vector<uint8_t> data;
-	};
-
-	struct FT1InfoSHA1Hash {
-		std::vector<uint8_t> hash;
-	};
-
-	struct FT1ChunkSHA1Cache {
-		std::vector<bool> have_chunk;
-		bool have_all {false};
-		size_t have_count {0};
-		entt::dense_map<SHA1Digest, std::vector<size_t>> chunk_hash_to_index;
-
-		std::vector<size_t> chunkIndices(const SHA1Digest& hash) const;
-		bool haveChunk(const SHA1Digest& hash) const;
-	};
-
-	struct FT1ChunkSHA1Requested {
-		// requested chunks with a timer since last request
-		entt::dense_map<size_t, float> chunks;
-	};
-
-	// TODO: once announce is shipped, remove the "Suspected"
-	struct SuspectedParticipants {
-		entt::dense_set<Contact3> participants;
-	};
-
-	struct ReRequestInfoTimer {
-		float timer {0.f};
-	};
-
-	struct ReadHeadHint {
-		// points to the first byte we want
-		// this is just a hint, that can be set from outside
-		// to guide the sequential "piece picker" strategy
-		// the strategy *should* set this to the first byte we dont yet have
-		uint64_t offset_into_file {0u};
-	};
-
-} // Components
-
-std::vector<size_t> Components::FT1ChunkSHA1Cache::chunkIndices(const SHA1Digest& hash) const {
-	const auto it = chunk_hash_to_index.find(hash);
-	if (it != chunk_hash_to_index.cend()) {
-		return it->second;
-	} else {
-		return {};
-	}
-}
-
-bool Components::FT1ChunkSHA1Cache::haveChunk(const SHA1Digest& hash) const {
-	if (have_all) { // short cut
-		return true;
-	}
-
-	if (auto i_vec = chunkIndices(hash); !i_vec.empty()) {
-		// TODO: should i test all?
-		return have_chunk[i_vec.front()];
-	}
-
-	// not part of this file
-	return false;
-}
-
 static size_t chunkSize(const FT1InfoSHA1& sha1_info, size_t chunk_index) {
 	if (chunk_index+1 == sha1_info.chunks.size()) {
 		// last chunk