diff --git a/src/Makefile.am b/src/Makefile.am
index 9145ad2380..02c80d3e57 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -297,6 +297,7 @@ BITCOIN_CORE_H = \
   support/events.h \
   support/lockedpool.h \
   sync.h \
+  timestampindex.h \
   threadsafety.h \
   threadinterrupt.h \
   timedata.h \
diff --git a/src/spentindex.h b/src/spentindex.h
index b7b5a60aa4..3c03d66e95 100644
--- a/src/spentindex.h
+++ b/src/spentindex.h
@@ -99,73 +99,6 @@ struct CSpentIndexTxInfo
     std::map<CSpentIndexKey, CSpentIndexValue, CSpentIndexKeyCompare> mSpentInfo;
 };
 
-struct CTimestampIndexIteratorKey {
-public:
-    uint32_t m_time;
-
-public:
-    CTimestampIndexIteratorKey() {
-        SetNull();
-    }
-
-    CTimestampIndexIteratorKey(uint32_t time) : m_time{time} {};
-
-    void SetNull() {
-        m_time = 0;
-    }
-
-public:
-    size_t GetSerializeSize(int nType, int nVersion) const {
-        return 4;
-    }
-
-    template<typename Stream>
-    void Serialize(Stream& s) const {
-        ser_writedata32be(s, m_time);
-    }
-
-    template<typename Stream>
-    void Unserialize(Stream& s) {
-        m_time = ser_readdata32be(s);
-    }
-};
-
-struct CTimestampIndexKey {
-public:
-    uint32_t m_block_time;
-    uint256 m_block_hash;
-
-public:
-    CTimestampIndexKey() {
-        SetNull();
-    }
-
-    CTimestampIndexKey(uint32_t block_time, uint256 block_hash) :
-        m_block_time{block_time}, m_block_hash{block_hash} {};
-
-    void SetNull() {
-        m_block_time = 0;
-        m_block_hash.SetNull();
-    }
-
-public:
-    size_t GetSerializeSize(int nType, int nVersion) const {
-        return 36;
-    }
-
-    template<typename Stream>
-    void Serialize(Stream& s) const {
-        ser_writedata32be(s, m_block_time);
-        m_block_hash.Serialize(s);
-    }
-
-    template<typename Stream>
-    void Unserialize(Stream& s) {
-        m_block_time = ser_readdata32be(s);
-        m_block_hash.Unserialize(s);
-    }
-};
-
 struct CAddressUnspentKey {
 public:
     uint8_t m_address_type{AddressType::UNKNOWN};
diff --git a/src/timestampindex.h b/src/timestampindex.h
new file mode 100644
index 0000000000..a1e300bfda
--- /dev/null
+++ b/src/timestampindex.h
@@ -0,0 +1,80 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2015 The Bitcoin Core developers
+// Copyright (c) 2016 BitPay, Inc.
+// Copyright (c) 2023 The Dash Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_TIMESTAMPINDEX_H
+#define BITCOIN_TIMESTAMPINDEX_H
+
+#include <uint256.h>
+
+struct CTimestampIndexIteratorKey {
+public:
+    uint32_t m_time;
+
+public:
+    CTimestampIndexIteratorKey() {
+        SetNull();
+    }
+
+    CTimestampIndexIteratorKey(uint32_t time) : m_time{time} {};
+
+    void SetNull() {
+        m_time = 0;
+    }
+
+public:
+    size_t GetSerializeSize(int nType, int nVersion) const {
+        return 4;
+    }
+
+    template<typename Stream>
+    void Serialize(Stream& s) const {
+        ser_writedata32be(s, m_time);
+    }
+
+    template<typename Stream>
+    void Unserialize(Stream& s) {
+        m_time = ser_readdata32be(s);
+    }
+};
+
+struct CTimestampIndexKey {
+public:
+    uint32_t m_block_time;
+    uint256 m_block_hash;
+
+public:
+    CTimestampIndexKey() {
+        SetNull();
+    }
+
+    CTimestampIndexKey(uint32_t block_time, uint256 block_hash) :
+        m_block_time{block_time}, m_block_hash{block_hash} {};
+
+    void SetNull() {
+        m_block_time = 0;
+        m_block_hash.SetNull();
+    }
+
+public:
+    size_t GetSerializeSize(int nType, int nVersion) const {
+        return 36;
+    }
+
+    template<typename Stream>
+    void Serialize(Stream& s) const {
+        ser_writedata32be(s, m_block_time);
+        m_block_hash.Serialize(s);
+    }
+
+    template<typename Stream>
+    void Unserialize(Stream& s) {
+        m_block_time = ser_readdata32be(s);
+        m_block_hash.Unserialize(s);
+    }
+};
+
+#endif // BITCOIN_TIMESTAMPINDEX_H
diff --git a/src/txdb.h b/src/txdb.h
index bac6c8bb58..9b73e4780b 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -11,6 +11,7 @@
 #include <chain.h>
 #include <primitives/block.h>
 #include <spentindex.h>
+#include <timestampindex.h>
 
 #include <memory>
 #include <string>