diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -54,10 +54,4 @@
  */
 std::string ChainNameFromCommandLine();
 
-/**
- * Return true if SelectBaseParamsFromCommandLine() has been called to select
- * a network.
- */
-bool AreBaseParamsConfigured();
-
 #endif // BITCOIN_CHAINPARAMSBASE_H
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -93,7 +93,3 @@
     if (fTestNet) return CBaseChainParams::TESTNET;
     return CBaseChainParams::MAIN;
 }
-
-bool AreBaseParamsConfigured() {
-    return pCurrentBaseParams != nullptr;
-}
diff --git a/src/key.h b/src/key.h
--- a/src/key.h
+++ b/src/key.h
@@ -90,9 +90,6 @@
     //! be) compressed.
     bool IsCompressed() const { return fCompressed; }
 
-    //! Initialize from a CPrivKey (serialized OpenSSL private key data).
-    bool SetPrivKey(const CPrivKey &vchPrivKey, bool fCompressed);
-
     //! Generate a new private key using a cryptographic PRNG.
     void MakeNewKey(bool fCompressed);
 
diff --git a/src/key.cpp b/src/key.cpp
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -152,15 +152,6 @@
     fCompressed = fCompressedIn;
 }
 
-bool CKey::SetPrivKey(const CPrivKey &privkey, bool fCompressedIn) {
-    if (!ec_privkey_import_der(secp256k1_context_sign, (uint8_t *)begin(),
-                               &privkey[0], privkey.size()))
-        return false;
-    fCompressed = fCompressedIn;
-    fValid = true;
-    return true;
-}
-
 CPrivKey CKey::GetPrivKey() const {
     assert(fValid);
     CPrivKey privkey;
diff --git a/src/netaddress.h b/src/netaddress.h
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -82,7 +82,6 @@
     bool IsLocal() const;
     bool IsRoutable() const;
     bool IsValid() const;
-    bool IsMulticast() const;
     enum Network GetNetwork() const;
     std::string ToString() const;
     std::string ToStringIP() const;
diff --git a/src/netaddress.cpp b/src/netaddress.cpp
--- a/src/netaddress.cpp
+++ b/src/netaddress.cpp
@@ -160,10 +160,6 @@
     return false;
 }
 
-bool CNetAddr::IsMulticast() const {
-    return (IsIPv4() && (GetByte(3) & 0xF0) == 0xE0) || (GetByte(15) == 0xFF);
-}
-
 bool CNetAddr::IsValid() const {
     // Cleanup 3-byte shifted addresses caused by garbage in size field of addr
     // messages from versions before 0.2.9 checksum.
diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -296,10 +296,7 @@
                 ScriptError *serror) {
     static const CScriptNum bnZero(0);
     static const CScriptNum bnOne(1);
-    static const CScriptNum bnFalse(0);
-    static const CScriptNum bnTrue(1);
     static const valtype vchFalse(0);
-    static const valtype vchZero(0);
     static const valtype vchTrue(1, 1);
 
     CScript::const_iterator pc = script.begin();
diff --git a/src/wallet/db.h b/src/wallet/db.h
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -78,7 +78,6 @@
     void CheckpointLSN(const std::string &strFile);
 
     void CloseDb(const std::string &strFile);
-    bool RemoveDb(const std::string &strFile);
 
     DbTxn *TxnBegin(int flags = DB_TXN_WRITE_NOSYNC) {
         DbTxn *ptxn = nullptr;
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -495,14 +495,6 @@
     }
 }
 
-bool CDBEnv::RemoveDb(const std::string &strFile) {
-    this->CloseDb(strFile);
-
-    LOCK(cs_db);
-    int rc = dbenv->dbremove(nullptr, strFile.c_str(), nullptr, DB_AUTO_COMMIT);
-    return (rc == 0);
-}
-
 bool CDB::Rewrite(CWalletDBWrapper &dbw, const char *pszSkip) {
     if (dbw.IsDummy()) {
         return true;