diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -91,6 +91,7 @@
   base58.h \
   bloom.h \
   blockencodings.h \
+  blockfileinfo.h \
   blockindexworkcomparator.h \
   cashaddr.h \
   cashaddrenc.h \
diff --git a/src/blockfileinfo.h b/src/blockfileinfo.h
new file mode 100644
--- /dev/null
+++ b/src/blockfileinfo.h
@@ -0,0 +1,75 @@
+// Copyright (c) 2018 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_BLOCKFILEINFO_H
+#define BITCOIN_BLOCKFILEINFO_H
+
+#include "serialize.h"
+
+#include <cstdint>
+#include <string>
+
+class CBlockFileInfo {
+public:
+    //!< number of blocks stored in file
+    unsigned int nBlocks;
+    //!< number of used bytes of block file
+    unsigned int nSize;
+    //!< number of used bytes in the undo file
+    unsigned int nUndoSize;
+    //!< lowest height of block in file
+    unsigned int nHeightFirst;
+    //!< highest height of block in file
+    unsigned int nHeightLast;
+    //!< earliest time of block in file
+    uint64_t nTimeFirst;
+    //!< latest time of block in file
+    uint64_t nTimeLast;
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream &s, Operation ser_action) {
+        READWRITE(VARINT(nBlocks));
+        READWRITE(VARINT(nSize));
+        READWRITE(VARINT(nUndoSize));
+        READWRITE(VARINT(nHeightFirst));
+        READWRITE(VARINT(nHeightLast));
+        READWRITE(VARINT(nTimeFirst));
+        READWRITE(VARINT(nTimeLast));
+    }
+
+    void SetNull() {
+        nBlocks = 0;
+        nSize = 0;
+        nUndoSize = 0;
+        nHeightFirst = 0;
+        nHeightLast = 0;
+        nTimeFirst = 0;
+        nTimeLast = 0;
+    }
+
+    CBlockFileInfo() { SetNull(); }
+
+    std::string ToString() const;
+
+    /** update statistics (does not update nSize) */
+    void AddBlock(unsigned int nHeightIn, uint64_t nTimeIn) {
+        if (nBlocks == 0 || nHeightFirst > nHeightIn) {
+            nHeightFirst = nHeightIn;
+        }
+        if (nBlocks == 0 || nTimeFirst > nTimeIn) {
+            nTimeFirst = nTimeIn;
+        }
+        nBlocks++;
+        if (nHeightIn > nHeightLast) {
+            nHeightLast = nHeightIn;
+        }
+        if (nTimeIn > nTimeLast) {
+            nTimeLast = nTimeIn;
+        }
+    }
+};
+
+#endif // BITCOIN_BLOCKFILEINFO_H
diff --git a/src/chain.h b/src/chain.h
--- a/src/chain.h
+++ b/src/chain.h
@@ -30,68 +30,6 @@
  */
 static const int64_t TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME;
 
-class CBlockFileInfo {
-public:
-    //!< number of blocks stored in file
-    unsigned int nBlocks;
-    //!< number of used bytes of block file
-    unsigned int nSize;
-    //!< number of used bytes in the undo file
-    unsigned int nUndoSize;
-    //!< lowest height of block in file
-    unsigned int nHeightFirst;
-    //!< highest height of block in file
-    unsigned int nHeightLast;
-    //!< earliest time of block in file
-    uint64_t nTimeFirst;
-    //!< latest time of block in file
-    uint64_t nTimeLast;
-
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream &s, Operation ser_action) {
-        READWRITE(VARINT(nBlocks));
-        READWRITE(VARINT(nSize));
-        READWRITE(VARINT(nUndoSize));
-        READWRITE(VARINT(nHeightFirst));
-        READWRITE(VARINT(nHeightLast));
-        READWRITE(VARINT(nTimeFirst));
-        READWRITE(VARINT(nTimeLast));
-    }
-
-    void SetNull() {
-        nBlocks = 0;
-        nSize = 0;
-        nUndoSize = 0;
-        nHeightFirst = 0;
-        nHeightLast = 0;
-        nTimeFirst = 0;
-        nTimeLast = 0;
-    }
-
-    CBlockFileInfo() { SetNull(); }
-
-    std::string ToString() const;
-
-    /** update statistics (does not update nSize) */
-    void AddBlock(unsigned int nHeightIn, uint64_t nTimeIn) {
-        if (nBlocks == 0 || nHeightFirst > nHeightIn) {
-            nHeightFirst = nHeightIn;
-        }
-        if (nBlocks == 0 || nTimeFirst > nTimeIn) {
-            nTimeFirst = nTimeIn;
-        }
-        nBlocks++;
-        if (nHeightIn > nHeightLast) {
-            nHeightLast = nHeightIn;
-        }
-        if (nTimeIn > nTimeLast) {
-            nTimeLast = nTimeIn;
-        }
-    }
-};
-
 struct CDiskBlockPos {
     int nFile;
     unsigned int nPos;
diff --git a/src/txdb.h b/src/txdb.h
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -6,6 +6,7 @@
 #ifndef BITCOIN_TXDB_H
 #define BITCOIN_TXDB_H
 
+#include "blockfileinfo.h"
 #include "chain.h"
 #include "coins.h"
 #include "dbwrapper.h"
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -12,6 +12,7 @@
 #endif
 
 #include "amount.h"
+#include "blockfileinfo.h"
 #include "chain.h"
 #include "coins.h"
 #include "consensus/consensus.h"