diff --git a/src/wallet/monero_wallet_core.cpp b/src/wallet/monero_wallet_core.cpp
index eb81243..a1615dc 100644
--- a/src/wallet/monero_wallet_core.cpp
+++ b/src/wallet/monero_wallet_core.cpp
@@ -1325,8 +1325,6 @@ namespace monero {
     return get_subaddresses_aux(account_idx, subaddress_indices, transfers);
   }
 
-  // get_subaddresses
-
   monero_subaddress monero_wallet_core::create_subaddress(const uint32_t account_idx, const string& label) {
     MTRACE("create_subaddress(" << account_idx << ", " << label << ")");
 
diff --git a/src/wallet/monero_wallet_core.h b/src/wallet/monero_wallet_core.h
index 10a9981..192f6fa 100644
--- a/src/wallet/monero_wallet_core.h
+++ b/src/wallet/monero_wallet_core.h
@@ -108,7 +108,7 @@ namespace monero {
      * @param daemon_connection is connection information to a daemon (default = an unconnected wallet)
      * @param language is the wallet and mnemonic's language (default = "English")
      */
-    static monero_wallet_core* create_wallet_random(const string& path, const string& password, const monero_network_type network_type, const monero_rpc_connection& daemon_connection = monero_rpc_connection, const string& language = "English");
+    static monero_wallet_core* create_wallet_random(const string& path, const string& password, const monero_network_type network_type, const monero_rpc_connection& daemon_connection, const string& language = "English");
 
     /**
      * Create a wallet from an existing mnemonic phrase.
@@ -195,7 +195,6 @@ namespace monero {
     monero_account get_account(const uint32_t account_idx, bool include_subaddresses) const;
     monero_account create_account(const string& label = "");
     vector<monero_subaddress> get_subaddresses(const uint32_t account_idx, const vector<uint32_t>& subaddress_indices) const;
-    monero_subaddress get_subaddress(const uint32_t account_idx, const uint32_t subaddress_idx) const;
     monero_subaddress create_subaddress(uint32_t account_idx, const string& label = "");
     vector<shared_ptr<monero_tx_wallet>> get_txs() const;
     vector<shared_ptr<monero_tx_wallet>> get_txs(const monero_tx_query& query) const;
diff --git a/src/wallet/monero_wallet_keys.cpp b/src/wallet/monero_wallet_keys.cpp
index 3cd01e6..14321ce 100644
--- a/src/wallet/monero_wallet_keys.cpp
+++ b/src/wallet/monero_wallet_keys.cpp
@@ -258,6 +258,16 @@ namespace monero {
     return subaddresses;
   }
 
+  string monero_wallet_keys::sign(const string& msg) const {
+    cout << "monero_wallet_keys::sign()" << endl;
+    throw runtime_error("monero_wallet_keys::sign() not implemented");
+  }
+
+  bool monero_wallet_keys::verify(const string& msg, const string& address, const string& signature) const {
+    cout << "monero_wallet_keys::verify()" << endl;
+    throw runtime_error("monero_wallet_keys::verify() not implemented");
+  }
+
   void monero_wallet_keys::close(bool save) {
     if (save) throw runtime_error("MoneroWalletKeys does not support saving");
     // no pointers to destroy
diff --git a/src/wallet/monero_wallet_keys.h b/src/wallet/monero_wallet_keys.h
index c563b1b..b8eb8bc 100644
--- a/src/wallet/monero_wallet_keys.h
+++ b/src/wallet/monero_wallet_keys.h
@@ -120,7 +120,6 @@ namespace monero {
     monero_integrated_address decode_integrated_address(const string& integrated_address) const;
     monero_account get_account(const uint32_t account_idx, bool include_subaddresses) const;
     vector<monero_subaddress> get_subaddresses(const uint32_t account_idx, const vector<uint32_t>& subaddress_indices) const;
-    monero_subaddress get_subaddress(const uint32_t account_idx, const uint32_t subaddress_idx) const;
     string sign(const string& msg) const;
     bool verify(const string& msg, const string& address, const string& signature) const;
     void close(bool save = false);