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diff --git a/security/ct/BTTypes.h b/security/ct/BTTypes.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BTTypes_h
+#define BTTypes_h
+
+#include <vector>
+
+#include "Buffer.h"
+
+namespace mozilla {
+namespace ct {
+
+// Represents a Merkle inclusion proof for purposes of serialization,
+// deserialization, and verification of the proof.  The format for inclusion
+// proofs in RFC 6962-bis is as follows:
+//
+//    opaque LogID<2..127>;
+//    opaque NodeHash<32..2^8-1>;
+//
+//     struct {
+//         LogID log_id;
+//         uint64 tree_size;
+//         uint64 leaf_index;
+//         NodeHash inclusion_path<1..2^16-1>;
+//     } InclusionProofDataV2;
+
+struct InclusionProofDataV2 {
+  Buffer logId;
+  uint64_t treeSize;
+  uint64_t leafIndex;
+  std::vector<Buffer> inclusionPath;
+};
+
+// Represents a Signed Tree Head as per RFC 6962-bis. All extensions are
+// ignored. The signature field covers the data in the tree_head field.
+//
+//     struct {
+//         LogID log_id;
+//         TreeHeadDataV2 tree_head;
+//         opaque signature<0..2^16-1>;
+//     } SignedTreeHeadDataV2;
+//
+//     struct {
+//         uint64 timestamp;
+//         uint64 tree_size;
+//         NodeHash root_hash;
+//         Extension sth_extensions<0..2^16-1>;
+//     } TreeHeadDataV2;
+
+struct SignedTreeHeadDataV2 {
+  Buffer logId;
+  uint64_t timestamp;
+  uint64_t treeSize;
+  Buffer rootHash;
+};
+
+}  // namespace ct
+}  // namespace mozilla
+
+#endif  // BTTypes_h