diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -327,6 +327,7 @@
 	sync.cpp
 	threadinterrupt.cpp
 	uint256.cpp
+	util/bip32.cpp
 	util/bytevectorhash.cpp
 	util/error.cpp
 	util/moneystr.cpp
diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -237,6 +237,7 @@
   ui_interface.h \
   undo.h \
   util/bitmanip.h \
+  util/bip32.h \
   util/bytevectorhash.h \
   util/check.h \
   util/error.h \
@@ -545,6 +546,7 @@
   uint256.cpp \
   uint256.h \
   util/error.cpp \
+  util/bip32.cpp \
   util/system.cpp \
   util/moneystr.cpp \
   util/settings.cpp \
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -31,6 +31,7 @@
 #include <script/standard.h>
 #include <txmempool.h>
 #include <uint256.h>
+#include <util/bip32.h>
 #include <util/error.h>
 #include <util/strencodings.h>
 #include <validation.h>
diff --git a/src/script/descriptor.cpp b/src/script/descriptor.cpp
--- a/src/script/descriptor.cpp
+++ b/src/script/descriptor.cpp
@@ -11,6 +11,7 @@
 #include <script/script.h>
 #include <script/standard.h>
 #include <span.h>
+#include <util/bip32.h>
 #include <util/strencodings.h>
 #include <util/system.h>
 
@@ -26,17 +27,6 @@
 
 typedef std::vector<uint32_t> KeyPath;
 
-std::string FormatKeyPath(const KeyPath &path) {
-    std::string ret;
-    for (auto i : path) {
-        ret += strprintf("/%i", (i << 1) >> 1);
-        if (i >> 31) {
-            ret += '\'';
-        }
-    }
-    return ret;
-}
-
 /** Interface for public key objects in descriptors. */
 struct PubkeyProvider {
     virtual ~PubkeyProvider() = default;
@@ -69,7 +59,7 @@
     std::string OriginString() const {
         return HexStr(std::begin(m_origin.fingerprint),
                       std::end(m_origin.fingerprint)) +
-               FormatKeyPath(m_origin.path);
+               FormatHDKeypath(m_origin.path);
     }
 
 public:
@@ -225,7 +215,7 @@
         return true;
     }
     std::string ToString() const override {
-        std::string ret = EncodeExtPubKey(m_extkey) + FormatKeyPath(m_path);
+        std::string ret = EncodeExtPubKey(m_extkey) + FormatHDKeypath(m_path);
         if (IsRange()) {
             ret += "/*";
             if (m_derive == DeriveType::HARDENED) {
@@ -240,7 +230,7 @@
         if (!GetExtKey(arg, key)) {
             return false;
         }
-        out = EncodeExtKey(key) + FormatKeyPath(m_path);
+        out = EncodeExtKey(key) + FormatHDKeypath(m_path);
         if (IsRange()) {
             out += "/*";
             if (m_derive == DeriveType::HARDENED) {
diff --git a/src/util/bip32.h b/src/util/bip32.h
new file mode 100644
--- /dev/null
+++ b/src/util/bip32.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_BIP32_H
+#define BITCOIN_UTIL_BIP32_H
+
+#include <attributes.h>
+
+#include <string>
+#include <vector>
+
+/**
+ * Parse an HD keypaths like "m/7/0'/2000".
+ */
+NODISCARD bool ParseHDKeypath(const std::string &keypath_str,
+                              std::vector<uint32_t> &keypath);
+
+/**
+ * Write HD keypaths as strings
+ */
+std::string WriteHDKeypath(const std::vector<uint32_t> &keypath);
+std::string FormatHDKeypath(const std::vector<uint32_t> &path);
+
+#endif // BITCOIN_UTIL_BIP32_H
diff --git a/src/util/bip32.cpp b/src/util/bip32.cpp
new file mode 100644
--- /dev/null
+++ b/src/util/bip32.cpp
@@ -0,0 +1,68 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <util/bip32.h>
+
+#include <tinyformat.h>
+#include <util/strencodings.h>
+
+#include <cstdio>
+#include <sstream>
+
+bool ParseHDKeypath(const std::string &keypath_str,
+                    std::vector<uint32_t> &keypath) {
+    std::stringstream ss(keypath_str);
+    std::string item;
+    bool first = true;
+    while (std::getline(ss, item, '/')) {
+        if (item.compare("m") == 0) {
+            if (first) {
+                first = false;
+                continue;
+            }
+            return false;
+        }
+        // Finds whether it is hardened
+        uint32_t path = 0;
+        size_t pos = item.find("'");
+        if (pos != std::string::npos) {
+            // The hardened tick can only be in the last index of the string
+            if (pos != item.size() - 1) {
+                return false;
+            }
+            path |= 0x80000000;
+            // Drop the last character which is the hardened tick
+            item = item.substr(0, item.size() - 1);
+        }
+
+        // Ensure this is only numbers
+        if (item.find_first_not_of("0123456789") != std::string::npos) {
+            return false;
+        }
+        uint32_t number;
+        if (!ParseUInt32(item, &number)) {
+            return false;
+        }
+        path |= number;
+
+        keypath.push_back(path);
+        first = false;
+    }
+    return true;
+}
+
+std::string FormatHDKeypath(const std::vector<uint32_t> &path) {
+    std::string ret;
+    for (auto i : path) {
+        ret += strprintf("/%i", (i << 1) >> 1);
+        if (i >> 31) {
+            ret += '\'';
+        }
+    }
+    return ret;
+}
+
+std::string WriteHDKeypath(const std::vector<uint32_t> &keypath) {
+    return "m" + FormatHDKeypath(keypath);
+}
diff --git a/src/util/strencodings.h b/src/util/strencodings.h
--- a/src/util/strencodings.h
+++ b/src/util/strencodings.h
@@ -217,10 +217,6 @@
     return true;
 }
 
-/** Parse an HD keypaths like "m/7/0'/2000". */
-NODISCARD bool ParseHDKeypath(const std::string &keypath_str,
-                              std::vector<uint32_t> &keypath);
-
 /**
  * Converts the given character to its lowercase equivalent.
  * This function is locale independent. It only converts uppercase
diff --git a/src/util/strencodings.cpp b/src/util/strencodings.cpp
--- a/src/util/strencodings.cpp
+++ b/src/util/strencodings.cpp
@@ -619,48 +619,6 @@
     return true;
 }
 
-bool ParseHDKeypath(const std::string &keypath_str,
-                    std::vector<uint32_t> &keypath) {
-    std::stringstream ss(keypath_str);
-    std::string item;
-    bool first = true;
-    while (std::getline(ss, item, '/')) {
-        if (item.compare("m") == 0) {
-            if (first) {
-                first = false;
-                continue;
-            }
-            return false;
-        }
-        // Finds whether it is hardened
-        uint32_t path = 0;
-        size_t pos = item.find("'");
-        if (pos != std::string::npos) {
-            // The hardened tick can only be in the last index of the string
-            if (pos != item.size() - 1) {
-                return false;
-            }
-            path |= 0x80000000;
-            // Drop the last character which is the hardened tick
-            item = item.substr(0, item.size() - 1);
-        }
-
-        // Ensure this is only numbers
-        if (item.find_first_not_of("0123456789") != std::string::npos) {
-            return false;
-        }
-        uint32_t number;
-        if (!ParseUInt32(item, &number)) {
-            return false;
-        }
-        path |= number;
-
-        keypath.push_back(path);
-        first = false;
-    }
-    return true;
-}
-
 void Downcase(std::string &str) {
     std::transform(str.begin(), str.end(), str.begin(),
                    [](uint8_t c) { return ToLower(c); });
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -24,6 +24,7 @@
 #include <script/descriptor.h>
 #include <shutdown.h>
 #include <timedata.h>
+#include <util/bip32.h>
 #include <util/error.h>
 #include <util/moneystr.h>
 #include <util/system.h>
diff --git a/src/wallet/test/psbt_wallet_tests.cpp b/src/wallet/test/psbt_wallet_tests.cpp
--- a/src/wallet/test/psbt_wallet_tests.cpp
+++ b/src/wallet/test/psbt_wallet_tests.cpp
@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <key_io.h>
+#include <util/bip32.h>
 #include <util/error.h>
 #include <util/strencodings.h>
 #include <wallet/psbtwallet.h>
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -29,6 +29,7 @@
 #include <timedata.h>
 #include <txmempool.h>
 #include <ui_interface.h>
+#include <util/bip32.h>
 #include <util/error.h>
 #include <util/moneystr.h>
 #include <util/system.h>