diff --git a/src/key.h b/src/key.h
--- a/src/key.h
+++ b/src/key.h
@@ -174,23 +174,6 @@
     bool Derive(CExtKey &out, unsigned int nChild) const;
     CExtPubKey Neuter() const;
     void SetSeed(const uint8_t *seed, unsigned int nSeedLen);
-    template <typename Stream> void Serialize(Stream &s) const {
-        unsigned int len = BIP32_EXTKEY_SIZE;
-        ::WriteCompactSize(s, len);
-        uint8_t code[BIP32_EXTKEY_SIZE];
-        Encode(code);
-        s.write((const char *)&code[0], len);
-    }
-    template <typename Stream> void Unserialize(Stream &s) {
-        unsigned int len = ::ReadCompactSize(s);
-        if (len != BIP32_EXTKEY_SIZE) {
-            throw std::runtime_error("Invalid extended key size\n");
-        }
-
-        uint8_t code[BIP32_EXTKEY_SIZE];
-        s.read((char *)&code[0], len);
-        Decode(code);
-    }
 
     CExtKey() = default;
 };
diff --git a/src/pubkey.h b/src/pubkey.h
--- a/src/pubkey.h
+++ b/src/pubkey.h
@@ -206,29 +206,6 @@
     void Decode(const uint8_t code[BIP32_EXTKEY_SIZE]);
     bool Derive(CExtPubKey &out, unsigned int nChild) const;
 
-    void Serialize(CSizeComputer &s) const {
-        // Optimized implementation for ::GetSerializeSize that avoids copying.
-        // add one byte for the size (compact int)
-        s.seek(BIP32_EXTKEY_SIZE + 1);
-    }
-    template <typename Stream> void Serialize(Stream &s) const {
-        unsigned int len = BIP32_EXTKEY_SIZE;
-        ::WriteCompactSize(s, len);
-        uint8_t code[BIP32_EXTKEY_SIZE];
-        Encode(code);
-        s.write((const char *)&code[0], len);
-    }
-    template <typename Stream> void Unserialize(Stream &s) {
-        unsigned int len = ::ReadCompactSize(s);
-        if (len != BIP32_EXTKEY_SIZE) {
-            throw std::runtime_error("Invalid extended key size\n");
-        }
-
-        uint8_t code[BIP32_EXTKEY_SIZE];
-        s.read((char *)&code[0], len);
-        Decode(code);
-    }
-
     CExtPubKey() = default;
 };
 
diff --git a/src/test/bip32_tests.cpp b/src/test/bip32_tests.cpp
--- a/src/test/bip32_tests.cpp
+++ b/src/test/bip32_tests.cpp
@@ -125,22 +125,6 @@
         }
         key = keyNew;
         pubkey = pubkeyNew;
-
-        CDataStream ssPub(SER_DISK, CLIENT_VERSION);
-        ssPub << pubkeyNew;
-        BOOST_CHECK(ssPub.size() == 75);
-
-        CDataStream ssPriv(SER_DISK, CLIENT_VERSION);
-        ssPriv << keyNew;
-        BOOST_CHECK(ssPriv.size() == 75);
-
-        CExtPubKey pubCheck;
-        CExtKey privCheck;
-        ssPub >> pubCheck;
-        ssPriv >> privCheck;
-
-        BOOST_CHECK(pubCheck == pubkeyNew);
-        BOOST_CHECK(privCheck == keyNew);
     }
 }
 
@@ -158,141 +142,4 @@
     RunTest(test3);
 }
 
-bool check_key_size_message(const std::runtime_error &e) {
-    BOOST_CHECK_EQUAL(e.what(), "Invalid extended key size\n");
-    return true;
-}
-
-BOOST_AUTO_TEST_CASE(bip32_serialization) {
-    std::vector<std::string> pubkeys{
-        "013442193e8000000047fdacbd0f1097043b78c63c20c34ef4ed9a111d980047ad1628"
-        "2c7ae6236141035a784662a4a20a65bf6aab9ae98a6c068a81c52e4b032c0fb5400c70"
-        "6cfccc56",
-        "025c1bd648000000012a7857631386ba23dacac34180dd1983734e444fdbf774041578"
-        "e9b6adb37c1903501e454bf00751f24b1b489aa925215d66af2234e3891c3b21a52bed"
-        "b3cd711c",
-        "03bef5a2f98000000204466b9cc8e161e966409ca52986c584f07e9dc81f735db683c3"
-        "ff6ec7b1503f0357bfe1e341d01c69fe5654309956cbea516822fba8a601743a012a78"
-        "96ee8dc2",
-        "04ee7ab90c00000002cfb71883f01676f587d023cc53a35bc7f88f724b1f8c2892ac12"
-        "75ac822a3edd02e8445082a72f29b75ca48748a914df60622a609cacfce8ed0e358045"
-        "60741d29",
-        "05d880d7d83b9aca00c783e67b921d2beb8f6b389cc646d7263b4145701dadd2161548"
-        "a8b078e65e9e022a471424da5e657499d1ff51cb43c47481a03b1e77f951fe64cec9f5"
-        "a48f7011",
-        "06d69aa10200000000739379b40b549fdb7f2439c028dac3192d4706deec3f0fef6816"
-        "ea36c8fc3fda028817473b2e81a20b60a24fc7a0d7869368ebc36740cfe08a18a19a9d"
-        "dafae67c",
-        "01bd16bee500000000f0909affaa7ee7abe5dd4e100598d4dc53cd709d5a5c2cac40e7"
-        "412f232f7c9c02fc9e5af0ac8d9b3cecfe2a888e2117ba3d089d8585886c9c826b6b22"
-        "a98d12ea",
-        "025a61ff8effffffffbe17a268474a6bb9c61e1d720cf6215e2a88c5406c4aee7b3854"
-        "7f585c9a37d903c01e7425647bdefa82b12d9bad5e3e6865bee0502694b94ca58b666a"
-        "bc0a5c3b",
-        "03d8ab493700000001f366f48f1ea9f2d1d3fe958c95ca84ea18e4c4ddb9366c336c92"
-        "7eb246fb38cb03a7d1d856deb74c508e05031f9895dab54626251b3806e16b4bd12e78"
-        "1a7df5b9",
-        "0478412e3afffffffe637807030d55d01f9a0cb3a7839515d796bd07706386a6eddf06"
-        "cc29a65a0e2902d2b36900396c9282fa14628566582f206a5dd0bcc8d5e892611806ca"
-        "fb0301f0",
-        "0531a507b8000000029452b549be8cea3ecb7a84bec10dcfd94afe4d129ebfd3b3cb58"
-        "eedf394ed271024d902e1a2fc7a8755ab5b694c575fce742c48d9ff192e63df5193e4c"
-        "7afe1f9c",
-        "0626132fdb0000000005bcc50a4c1bbfa6d982ae1f410f88ddcbacad781b11b8790c86"
-        "f49cdf9e77b0031c0517fff3d483f06ca769bd2326bf30aca1c4de278e676e6ef760c3"
-        "301244c6",
-        "0141d63b5080000000e5fea12a97b927fc9dc3d2cb0d1ea1cf50aa5a1fdc1f933e8906"
-        "bb38df3377bd026557fdda1d5d43d79611f784780471f086d58e8126b8c40acb82272a"
-        "7712e7f2",
-        "02c61368bb000000007c63ec0429a7324b76014ad222a32b7fdd3ae8755d0d2b2e3dfb"
-        "5ede9787af990379e45b3cf75f9c5f9befd8e9506fb962f6a9d185ac87001ec44a8d3d"
-        "f8d4a9e3",
-    };
-
-    for (const std::string &hex : pubkeys) {
-        CDataStream ss(SER_DISK, CLIENT_VERSION);
-        ss << ParseHex(hex);
-        BOOST_CHECK(ss.size() == 75);
-
-        CExtPubKey pubkey;
-        BOOST_CHECK_NO_THROW(ss >> pubkey);
-
-        ss << ParseHex(hex + "00");
-        BOOST_CHECK(ss.size() == 76);
-        BOOST_CHECK_EXCEPTION(ss >> pubkey, std::runtime_error,
-                              check_key_size_message);
-
-        ss.clear();
-        ss << ParseHex(hex.substr(0, hex.size() - 1));
-        BOOST_CHECK(ss.size() == 74);
-        BOOST_CHECK_EXCEPTION(ss >> pubkey, std::runtime_error,
-                              check_key_size_message);
-    }
-
-    std::vector<std::string> privkeys{
-        "013442193e8000000047fdacbd0f1097043b78c63c20c34ef4ed9a111d980047ad1628"
-        "2c7ae623614100edb2e14f9ee77d26dd93b4ecede8d16ed408ce149b6cd80b0715a2d9"
-        "11a0afea",
-        "025c1bd648000000012a7857631386ba23dacac34180dd1983734e444fdbf774041578"
-        "e9b6adb37c19003c6cb8d0f6a264c91ea8b5030fadaa8e538b020f0a387421a12de931"
-        "9dc93368",
-        "03bef5a2f98000000204466b9cc8e161e966409ca52986c584f07e9dc81f735db683c3"
-        "ff6ec7b1503f00cbce0d719ecf7431d88e6a89fa1483e02e35092af60c042b1df2ff59"
-        "fa424dca",
-        "04ee7ab90c00000002cfb71883f01676f587d023cc53a35bc7f88f724b1f8c2892ac12"
-        "75ac822a3edd000f479245fb19a38a1954c5c7c0ebab2f9bdfd96a17563ef28a6a4b1a"
-        "2a764ef4",
-        "05d880d7d83b9aca00c783e67b921d2beb8f6b389cc646d7263b4145701dadd2161548"
-        "a8b078e65e9e00471b76e389e528d6de6d816857e012c5455051cad6660850e58372a6"
-        "c3e6e7c8",
-        "06d69aa10200000000739379b40b549fdb7f2439c028dac3192d4706deec3f0fef6816"
-        "ea36c8fc3fda00996cbe292e59ce1c8ee257522ce969b9faa413f7e9aa4a8785b8f574"
-        "e0e2f061",
-        "01bd16bee500000000f0909affaa7ee7abe5dd4e100598d4dc53cd709d5a5c2cac40e7"
-        "412f232f7c9c00abe74a98f6c7eabee0428f53798f0ab8aa1bd37873999041703c742f"
-        "15ac7e1e",
-        "025a61ff8effffffffbe17a268474a6bb9c61e1d720cf6215e2a88c5406c4aee7b3854"
-        "7f585c9a37d900877c779ad9687164e9c2f4f0f4ff0340814392330693ce95a58fe18f"
-        "d52e6e93",
-        "03d8ab493700000001f366f48f1ea9f2d1d3fe958c95ca84ea18e4c4ddb9366c336c92"
-        "7eb246fb38cb00704addf544a06e5ee4bea37098463c23613da32020d604506da8c051"
-        "8e1da4b7",
-        "0478412e3afffffffe637807030d55d01f9a0cb3a7839515d796bd07706386a6eddf06"
-        "cc29a65a0e2900f1c7c871a54a804afe328b4c83a1c33b8e5ff48f5087273f04efa83b"
-        "247d6a2d",
-        "0531a507b8000000029452b549be8cea3ecb7a84bec10dcfd94afe4d129ebfd3b3cb58"
-        "eedf394ed27100bb7d39bdb83ecf58f2fd82b6d918341cbef428661ef01ab97c28a484"
-        "2125ac23",
-        "0626132fdb0000000005bcc50a4c1bbfa6d982ae1f410f88ddcbacad781b11b8790c86"
-        "f49cdf9e77b0004b7e8b1aa263519f7fbed001d5b0c4a5fdac81db8abe14c327e2f534"
-        "92e55fa7",
-        "0141d63b5080000000e5fea12a97b927fc9dc3d2cb0d1ea1cf50aa5a1fdc1f933e8906"
-        "bb38df3377bd00491f7a2eebc7b57028e0d3faa0acda02e75c33b03c48fb288c41e2ea"
-        "44e1daef",
-        "02c61368bb000000007c63ec0429a7324b76014ad222a32b7fdd3ae8755d0d2b2e3dfb"
-        "5ede9787af9900129ee831061c31be7d636fc0402fd2299855f40015a2c60b2e5755c5"
-        "7270460d",
-    };
-
-    for (const std::string &hex : privkeys) {
-        CDataStream ss(SER_DISK, CLIENT_VERSION);
-        ss << ParseHex(hex);
-        BOOST_CHECK(ss.size() == 75);
-
-        CExtKey privkey;
-        BOOST_CHECK_NO_THROW(ss >> privkey);
-
-        ss << ParseHex(hex + "00");
-        BOOST_CHECK(ss.size() == 76);
-        BOOST_CHECK_EXCEPTION(ss >> privkey, std::runtime_error,
-                              check_key_size_message);
-
-        ss.clear();
-        ss << ParseHex(hex.substr(0, hex.size() - 1));
-        BOOST_CHECK(ss.size() == 74);
-        BOOST_CHECK_EXCEPTION(ss >> privkey, std::runtime_error,
-                              check_key_size_message);
-    }
-}
-
 BOOST_AUTO_TEST_SUITE_END()