diff --git a/src/blockchain_db/berkeleydb/db_bdb.cpp b/src/blockchain_db/berkeleydb/db_bdb.cpp
index 3eb24494f..d138a1e7e 100644
--- a/src/blockchain_db/berkeleydb/db_bdb.cpp
+++ b/src/blockchain_db/berkeleydb/db_bdb.cpp
@@ -1654,36 +1654,6 @@ tx_out_index BlockchainBDB::get_output_tx_and_index(const uint64_t& amount, cons
     return indices[0];
 }
 
-std::vector<uint64_t> BlockchainBDB::get_tx_output_indices(const crypto::hash& h) const
-{
-    LOG_PRINT_L3("BlockchainBDB::" << __func__);
-    check_open();
-    std::vector<uint64_t> index_vec;
-
-    bdb_cur cur(DB_DEFAULT_TX, m_tx_outputs);
-
-    Dbt_copy<crypto::hash> k(h);
-    Dbt_copy<uint32_t> v;
-    auto result = cur->get(&k, &v, DB_SET);
-    if (result == DB_NOTFOUND)
-        throw1(OUTPUT_DNE("Attempting to get an output by tx hash and tx index, but output not found"));
-    else if (result)
-        throw0(DB_ERROR("DB error attempting to get an output"));
-
-    db_recno_t num_elems = 0;
-    cur->count(&num_elems, 0);
-
-    for (uint64_t i = 0; i < num_elems; ++i)
-    {
-        index_vec.push_back(v);
-        cur->get(&k, &v, DB_NEXT_DUP);
-    }
-
-    cur.close();
-
-    return index_vec;
-}
-
 std::vector<uint64_t> BlockchainBDB::get_tx_amount_output_indices(const crypto::hash& h) const
 {
     LOG_PRINT_L3("BlockchainBDB::" << __func__);
diff --git a/src/blockchain_db/berkeleydb/db_bdb.h b/src/blockchain_db/berkeleydb/db_bdb.h
index 04a33d7c6..3ae90efe1 100644
--- a/src/blockchain_db/berkeleydb/db_bdb.h
+++ b/src/blockchain_db/berkeleydb/db_bdb.h
@@ -312,7 +312,6 @@ public:
   virtual tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index);
   virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<tx_out_index> &indices);
 
-  virtual std::vector<uint64_t> get_tx_output_indices(const crypto::hash& h) const;
   virtual std::vector<uint64_t> get_tx_amount_output_indices(const crypto::hash& h) const;
 
   virtual bool has_key_image(const crypto::key_image& img) const;
diff --git a/src/blockchain_db/testdb.h b/src/blockchain_db/testdb.h
index 1492fb2ae..6c97713d5 100644
--- a/src/blockchain_db/testdb.h
+++ b/src/blockchain_db/testdb.h
@@ -42,98 +42,97 @@ namespace cryptonote
 class BaseTestDB: public cryptonote::BlockchainDB {
 public:
   BaseTestDB() {}
-  virtual void open(const std::string& filename, const int db_flags = 0) { }
-  virtual void close() {}
-  virtual void sync() {}
-  virtual void safesyncmode(const bool onoff) {}
-  virtual void reset() {}
-  virtual std::vector<std::string> get_filenames() const { return std::vector<std::string>(); }
-  virtual bool remove_data_file(const std::string& folder) const { return true; }
-  virtual std::string get_db_name() const { return std::string(); }
-  virtual bool lock() { return true; }
-  virtual void unlock() { }
-  virtual bool batch_start(uint64_t batch_num_blocks=0, uint64_t batch_bytes=0) { return true; }
-  virtual void batch_stop() {}
-  virtual void set_batch_transactions(bool) {}
-  virtual void block_wtxn_start() {}
-  virtual void block_wtxn_stop() {}
-  virtual void block_wtxn_abort() {}
-  virtual bool block_rtxn_start() const { return true; }
-  virtual void block_rtxn_stop() const {}
-  virtual void block_rtxn_abort() const {}
+  virtual void open(const std::string& filename, const int db_flags = 0) override { }
+  virtual void close() override {}
+  virtual void sync() override {}
+  virtual void safesyncmode(const bool onoff) override {}
+  virtual void reset() override {}
+  virtual std::vector<std::string> get_filenames() const override { return std::vector<std::string>(); }
+  virtual bool remove_data_file(const std::string& folder) const override { return true; }
+  virtual std::string get_db_name() const override { return std::string(); }
+  virtual bool lock() override { return true; }
+  virtual void unlock() override { }
+  virtual bool batch_start(uint64_t batch_num_blocks=0, uint64_t batch_bytes=0) override { return true; }
+  virtual void batch_stop() override {}
+  virtual void set_batch_transactions(bool) override {}
+  virtual void block_wtxn_start() override {}
+  virtual void block_wtxn_stop() override {}
+  virtual void block_wtxn_abort() override {}
+  virtual bool block_rtxn_start() const override { return true; }
+  virtual void block_rtxn_stop() const override {}
+  virtual void block_rtxn_abort() const override {}
 
-  virtual void drop_hard_fork_info() {}
-  virtual bool block_exists(const crypto::hash& h, uint64_t *height) const { return false; }
-  virtual cryptonote::blobdata get_block_blob_from_height(const uint64_t& height) const { return cryptonote::t_serializable_object_to_blob(get_block_from_height(height)); }
-  virtual cryptonote::blobdata get_block_blob(const crypto::hash& h) const { return cryptonote::blobdata(); }
-  virtual bool get_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
-  virtual bool get_pruned_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
-  virtual bool get_prunable_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const { return false; }
-  virtual bool get_prunable_tx_hash(const crypto::hash& tx_hash, crypto::hash &prunable_hash) const { return false; }
-  virtual uint64_t get_block_height(const crypto::hash& h) const { return 0; }
-  virtual cryptonote::block_header get_block_header(const crypto::hash& h) const { return cryptonote::block_header(); }
-  virtual uint64_t get_block_timestamp(const uint64_t& height) const { return 0; }
-  virtual std::vector<uint64_t> get_block_cumulative_rct_outputs(const std::vector<uint64_t> &heights) const { return {}; }
-  virtual uint64_t get_top_block_timestamp() const { return 0; }
-  virtual size_t get_block_weight(const uint64_t& height) const { return 128; }
-  virtual std::vector<uint64_t> get_block_weights(uint64_t start_height, size_t count) const { return {}; }
-  virtual cryptonote::difficulty_type get_block_cumulative_difficulty(const uint64_t& height) const { return 10; }
-  virtual cryptonote::difficulty_type get_block_difficulty(const uint64_t& height) const { return 0; }
-  virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const { return 10000000000; }
-  virtual uint64_t get_block_long_term_weight(const uint64_t& height) const { return 128; }
-  virtual std::vector<uint64_t> get_long_term_block_weights(uint64_t start_height, size_t count) const { return {}; }
-  virtual crypto::hash get_block_hash_from_height(const uint64_t& height) const { return crypto::hash(); }
-  virtual std::vector<cryptonote::block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const { return std::vector<cryptonote::block>(); }
-  virtual std::vector<crypto::hash> get_hashes_range(const uint64_t& h1, const uint64_t& h2) const { return std::vector<crypto::hash>(); }
-  virtual crypto::hash top_block_hash(uint64_t *block_height = NULL) const { if (block_height) *block_height = 0; return crypto::hash(); }
-  virtual cryptonote::block get_top_block() const { return cryptonote::block(); }
-  virtual uint64_t height() const { return 1; }
-  virtual bool tx_exists(const crypto::hash& h) const { return false; }
-  virtual bool tx_exists(const crypto::hash& h, uint64_t& tx_index) const { return false; }
-  virtual uint64_t get_tx_unlock_time(const crypto::hash& h) const { return 0; }
-  virtual cryptonote::transaction get_tx(const crypto::hash& h) const { return cryptonote::transaction(); }
-  virtual bool get_tx(const crypto::hash& h, cryptonote::transaction &tx) const { return false; }
-  virtual uint64_t get_tx_count() const { return 0; }
-  virtual std::vector<cryptonote::transaction> get_tx_list(const std::vector<crypto::hash>& hlist) const { return std::vector<cryptonote::transaction>(); }
-  virtual uint64_t get_tx_block_height(const crypto::hash& h) const { return 0; }
-  virtual uint64_t get_num_outputs(const uint64_t& amount) const { return 1; }
-  virtual uint64_t get_indexing_base() const { return 0; }
-  virtual cryptonote::output_data_t get_output_key(const uint64_t& amount, const uint64_t& index, bool include_commitmemt) const { return cryptonote::output_data_t(); }
-  virtual cryptonote::tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const { return cryptonote::tx_out_index(); }
-  virtual cryptonote::tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index) const { return cryptonote::tx_out_index(); }
-  virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<cryptonote::tx_out_index> &indices) const {}
-  virtual void get_output_key(const epee::span<const uint64_t> &amounts, const std::vector<uint64_t> &offsets, std::vector<cryptonote::output_data_t> &outputs, bool allow_partial = false) const {}
-  virtual bool can_thread_bulk_indices() const { return false; }
-  virtual std::vector<uint64_t> get_tx_output_indices(const crypto::hash& h) const { return std::vector<uint64_t>(); }
-  virtual std::vector<std::vector<uint64_t>> get_tx_amount_output_indices(const uint64_t tx_index, size_t n_txes) const { return std::vector<std::vector<uint64_t>>(); }
-  virtual bool has_key_image(const crypto::key_image& img) const { return false; }
-  virtual void remove_block() { }
-  virtual uint64_t add_transaction_data(const crypto::hash& blk_hash, const std::pair<cryptonote::transaction, cryptonote::blobdata>& tx, const crypto::hash& tx_hash, const crypto::hash& tx_prunable_hash) {return 0;}
-  virtual void remove_transaction_data(const crypto::hash& tx_hash, const cryptonote::transaction& tx) {}
-  virtual uint64_t add_output(const crypto::hash& tx_hash, const cryptonote::tx_out& tx_output, const uint64_t& local_index, const uint64_t unlock_time, const rct::key *commitment) {return 0;}
-  virtual void add_tx_amount_output_indices(const uint64_t tx_index, const std::vector<uint64_t>& amount_output_indices) {}
-  virtual void add_spent_key(const crypto::key_image& k_image) {}
-  virtual void remove_spent_key(const crypto::key_image& k_image) {}
+  virtual void drop_hard_fork_info() override {}
+  virtual bool block_exists(const crypto::hash& h, uint64_t *height) const override { return false; }
+  virtual cryptonote::blobdata get_block_blob_from_height(const uint64_t& height) const override { return cryptonote::t_serializable_object_to_blob(get_block_from_height(height)); }
+  virtual cryptonote::blobdata get_block_blob(const crypto::hash& h) const override { return cryptonote::blobdata(); }
+  virtual bool get_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
+  virtual bool get_pruned_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
+  virtual bool get_prunable_tx_blob(const crypto::hash& h, cryptonote::blobdata &tx) const override { return false; }
+  virtual bool get_prunable_tx_hash(const crypto::hash& tx_hash, crypto::hash &prunable_hash) const override { return false; }
+  virtual uint64_t get_block_height(const crypto::hash& h) const override { return 0; }
+  virtual cryptonote::block_header get_block_header(const crypto::hash& h) const override { return cryptonote::block_header(); }
+  virtual uint64_t get_block_timestamp(const uint64_t& height) const override { return 0; }
+  virtual std::vector<uint64_t> get_block_cumulative_rct_outputs(const std::vector<uint64_t> &heights) const override { return {}; }
+  virtual uint64_t get_top_block_timestamp() const override { return 0; }
+  virtual size_t get_block_weight(const uint64_t& height) const override { return 128; }
+  virtual std::vector<uint64_t> get_block_weights(uint64_t start_height, size_t count) const override { return {}; }
+  virtual cryptonote::difficulty_type get_block_cumulative_difficulty(const uint64_t& height) const override { return 10; }
+  virtual cryptonote::difficulty_type get_block_difficulty(const uint64_t& height) const override { return 0; }
+  virtual uint64_t get_block_already_generated_coins(const uint64_t& height) const override { return 10000000000; }
+  virtual uint64_t get_block_long_term_weight(const uint64_t& height) const override { return 128; }
+  virtual std::vector<uint64_t> get_long_term_block_weights(uint64_t start_height, size_t count) const override { return {}; }
+  virtual crypto::hash get_block_hash_from_height(const uint64_t& height) const override { return crypto::hash(); }
+  virtual std::vector<cryptonote::block> get_blocks_range(const uint64_t& h1, const uint64_t& h2) const override { return std::vector<cryptonote::block>(); }
+  virtual std::vector<crypto::hash> get_hashes_range(const uint64_t& h1, const uint64_t& h2) const override { return std::vector<crypto::hash>(); }
+  virtual crypto::hash top_block_hash(uint64_t *block_height = NULL) const override { if (block_height) *block_height = 0; return crypto::hash(); }
+  virtual cryptonote::block get_top_block() const override { return cryptonote::block(); }
+  virtual uint64_t height() const override { return 1; }
+  virtual bool tx_exists(const crypto::hash& h) const override { return false; }
+  virtual bool tx_exists(const crypto::hash& h, uint64_t& tx_index) const override { return false; }
+  virtual uint64_t get_tx_unlock_time(const crypto::hash& h) const override { return 0; }
+  virtual cryptonote::transaction get_tx(const crypto::hash& h) const override { return cryptonote::transaction(); }
+  virtual bool get_tx(const crypto::hash& h, cryptonote::transaction &tx) const override { return false; }
+  virtual uint64_t get_tx_count() const override { return 0; }
+  virtual std::vector<cryptonote::transaction> get_tx_list(const std::vector<crypto::hash>& hlist) const override { return std::vector<cryptonote::transaction>(); }
+  virtual uint64_t get_tx_block_height(const crypto::hash& h) const override { return 0; }
+  virtual uint64_t get_num_outputs(const uint64_t& amount) const override { return 1; }
+  virtual uint64_t get_indexing_base() const override { return 0; }
+  virtual cryptonote::output_data_t get_output_key(const uint64_t& amount, const uint64_t& index, bool include_commitmemt) const override { return cryptonote::output_data_t(); }
+  virtual cryptonote::tx_out_index get_output_tx_and_index_from_global(const uint64_t& index) const override { return cryptonote::tx_out_index(); }
+  virtual cryptonote::tx_out_index get_output_tx_and_index(const uint64_t& amount, const uint64_t& index) const override { return cryptonote::tx_out_index(); }
+  virtual void get_output_tx_and_index(const uint64_t& amount, const std::vector<uint64_t> &offsets, std::vector<cryptonote::tx_out_index> &indices) const override {}
+  virtual void get_output_key(const epee::span<const uint64_t> &amounts, const std::vector<uint64_t> &offsets, std::vector<cryptonote::output_data_t> &outputs, bool allow_partial = false) const override {}
+  virtual bool can_thread_bulk_indices() const override { return false; }
+  virtual std::vector<std::vector<uint64_t>> get_tx_amount_output_indices(const uint64_t tx_index, size_t n_txes) const override { return std::vector<std::vector<uint64_t>>(); }
+  virtual bool has_key_image(const crypto::key_image& img) const override { return false; }
+  virtual void remove_block() override { }
+  virtual uint64_t add_transaction_data(const crypto::hash& blk_hash, const std::pair<cryptonote::transaction, cryptonote::blobdata>& tx, const crypto::hash& tx_hash, const crypto::hash& tx_prunable_hash) override {return 0;}
+  virtual void remove_transaction_data(const crypto::hash& tx_hash, const cryptonote::transaction& tx) override {}
+  virtual uint64_t add_output(const crypto::hash& tx_hash, const cryptonote::tx_out& tx_output, const uint64_t& local_index, const uint64_t unlock_time, const rct::key *commitment) override {return 0;}
+  virtual void add_tx_amount_output_indices(const uint64_t tx_index, const std::vector<uint64_t>& amount_output_indices) override {}
+  virtual void add_spent_key(const crypto::key_image& k_image) override {}
+  virtual void remove_spent_key(const crypto::key_image& k_image) override {}
 
-  virtual bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const { return true; }
-  virtual bool for_blocks_range(const uint64_t&, const uint64_t&, std::function<bool(uint64_t, const crypto::hash&, const cryptonote::block&)>) const { return true; }
-  virtual bool for_all_transactions(std::function<bool(const crypto::hash&, const cryptonote::transaction&)>, bool pruned) const { return true; }
-  virtual bool for_all_outputs(std::function<bool(uint64_t amount, const crypto::hash &tx_hash, uint64_t height, size_t tx_idx)> f) const { return true; }
-  virtual bool for_all_outputs(uint64_t amount, const std::function<bool(uint64_t height)> &f) const { return true; }
-  virtual bool is_read_only() const { return false; }
-  virtual std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const { return std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>>(); }
-  virtual bool get_output_distribution(uint64_t amount, uint64_t from_height, uint64_t to_height, std::vector<uint64_t> &distribution, uint64_t &base) const { return false; }
+  virtual bool for_all_key_images(std::function<bool(const crypto::key_image&)>) const override { return true; }
+  virtual bool for_blocks_range(const uint64_t&, const uint64_t&, std::function<bool(uint64_t, const crypto::hash&, const cryptonote::block&)>) const override { return true; }
+  virtual bool for_all_transactions(std::function<bool(const crypto::hash&, const cryptonote::transaction&)>, bool pruned) const override { return true; }
+  virtual bool for_all_outputs(std::function<bool(uint64_t amount, const crypto::hash &tx_hash, uint64_t height, size_t tx_idx)> f) const override { return true; }
+  virtual bool for_all_outputs(uint64_t amount, const std::function<bool(uint64_t height)> &f) const override { return true; }
+  virtual bool is_read_only() const override { return false; }
+  virtual std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>> get_output_histogram(const std::vector<uint64_t> &amounts, bool unlocked, uint64_t recent_cutoff, uint64_t min_count) const override { return std::map<uint64_t, std::tuple<uint64_t, uint64_t, uint64_t>>(); }
+  virtual bool get_output_distribution(uint64_t amount, uint64_t from_height, uint64_t to_height, std::vector<uint64_t> &distribution, uint64_t &base) const override { return false; }
 
-  virtual void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const cryptonote::txpool_tx_meta_t& details) {}
-  virtual void update_txpool_tx(const crypto::hash &txid, const cryptonote::txpool_tx_meta_t& details) {}
-  virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const { return 0; }
-  virtual bool txpool_has_tx(const crypto::hash &txid) const { return false; }
-  virtual void remove_txpool_tx(const crypto::hash& txid) {}
-  virtual bool get_txpool_tx_meta(const crypto::hash& txid, cryptonote::txpool_tx_meta_t &meta) const { return false; }
-  virtual bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const { return false; }
-  virtual uint64_t get_database_size() const { return 0; }
-  virtual cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const { return ""; }
-  virtual bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const cryptonote::txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = false) const { return false; }
+  virtual void add_txpool_tx(const crypto::hash &txid, const cryptonote::blobdata &blob, const cryptonote::txpool_tx_meta_t& details) override {}
+  virtual void update_txpool_tx(const crypto::hash &txid, const cryptonote::txpool_tx_meta_t& details) override {}
+  virtual uint64_t get_txpool_tx_count(bool include_unrelayed_txes = true) const override { return 0; }
+  virtual bool txpool_has_tx(const crypto::hash &txid) const override { return false; }
+  virtual void remove_txpool_tx(const crypto::hash& txid) override {}
+  virtual bool get_txpool_tx_meta(const crypto::hash& txid, cryptonote::txpool_tx_meta_t &meta) const override { return false; }
+  virtual bool get_txpool_tx_blob(const crypto::hash& txid, cryptonote::blobdata &bd) const override { return false; }
+  virtual uint64_t get_database_size() const override { return 0; }
+  virtual cryptonote::blobdata get_txpool_tx_blob(const crypto::hash& txid) const override { return ""; }
+  virtual bool for_all_txpool_txes(std::function<bool(const crypto::hash&, const cryptonote::txpool_tx_meta_t&, const cryptonote::blobdata*)>, bool include_blob = false, bool include_unrelayed_txes = false) const override { return false; }
 
   virtual void add_block( const cryptonote::block& blk
                         , size_t block_weight
@@ -142,20 +141,20 @@ public:
                         , const uint64_t& coins_generated
                         , uint64_t num_rct_outs
                         , const crypto::hash& blk_hash
-                        ) { }
-  virtual cryptonote::block get_block_from_height(const uint64_t& height) const { return cryptonote::block(); }
-  virtual void set_hard_fork_version(uint64_t height, uint8_t version) {}
-  virtual uint8_t get_hard_fork_version(uint64_t height) const { return 0; }
-  virtual void check_hard_fork_info() {}
+                        ) override { }
+  virtual cryptonote::block get_block_from_height(const uint64_t& height) const override { return cryptonote::block(); }
+  virtual void set_hard_fork_version(uint64_t height, uint8_t version) override {}
+  virtual uint8_t get_hard_fork_version(uint64_t height) const override { return 0; }
+  virtual void check_hard_fork_info() override {}
 
-  virtual uint32_t get_blockchain_pruning_seed() const { return 0; }
-  virtual bool prune_blockchain(uint32_t pruning_seed = 0) { return true; }
-  virtual bool update_pruning() { return true; }
-  virtual bool check_pruning() { return true; }
-  virtual void prune_outputs(uint64_t amount) {}
+  virtual uint32_t get_blockchain_pruning_seed() const override { return 0; }
+  virtual bool prune_blockchain(uint32_t pruning_seed = 0) override { return true; }
+  virtual bool update_pruning() override { return true; }
+  virtual bool check_pruning() override { return true; }
+  virtual void prune_outputs(uint64_t amount) override {}
 
-  virtual uint64_t get_max_block_size() { return 100000000; }
-  virtual void add_max_block_size(uint64_t sz) { }
+  virtual uint64_t get_max_block_size() override { return 100000000; }
+  virtual void add_max_block_size(uint64_t sz) override { }
 };
 
 }
diff --git a/tests/unit_tests/hardfork.cpp b/tests/unit_tests/hardfork.cpp
index bb26b5533..1d1e8e9c0 100644
--- a/tests/unit_tests/hardfork.cpp
+++ b/tests/unit_tests/hardfork.cpp
@@ -46,7 +46,7 @@ namespace
 
 class TestDB: public cryptonote::BaseTestDB {
 public:
-  virtual uint64_t height() const { return blocks.size(); }
+  virtual uint64_t height() const override { return blocks.size(); }
   virtual void add_block( const block& blk
                         , size_t block_weight
                         , uint64_t long_term_block_weight
@@ -54,19 +54,19 @@ public:
                         , const uint64_t& coins_generated
                         , uint64_t num_rct_outs
                         , const crypto::hash& blk_hash
-                        ) {
+                        ) override {
     blocks.push_back(blk);
   }
-  virtual void remove_block() { blocks.pop_back(); }
-  virtual block get_block_from_height(const uint64_t& height) const {
+  virtual void remove_block() override { blocks.pop_back(); }
+  virtual block get_block_from_height(const uint64_t& height) const override {
     return blocks.at(height);
   }
-  virtual void set_hard_fork_version(uint64_t height, uint8_t version) {
+  virtual void set_hard_fork_version(uint64_t height, uint8_t version) override {
     if (versions.size() <= height) 
       versions.resize(height+1); 
     versions[height] = version;
   }
-  virtual uint8_t get_hard_fork_version(uint64_t height) const {
+  virtual uint8_t get_hard_fork_version(uint64_t height) const override {
     return versions.at(height);
   }