Adjust difficulty target (2 min) and full reward zone (60 kbytes) for block version 2

src/cryptonote_config.h

@@ -51,11 +51,12 @@
 
 // MONEY_SUPPLY - total number coins to be generated
 #define MONEY_SUPPLY                                    ((uint64_t)(-1))
-#define EMISSION_SPEED_FACTOR                           (20)
+#define EMISSION_SPEED_FACTOR_PER_MINUTE                (20)
 #define FINAL_SUBSIDY_PER_MINUTE                        ((uint64_t)300000000000) // 3 * pow(10, 11)
 
 #define CRYPTONOTE_REWARD_BLOCKS_WINDOW                 100
-#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE       20000 //size of block (bytes) after which reward for block calculated using block size
+#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE       60000 //size of block (bytes) after which reward for block calculated using block size
+#define CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1    20000 //size of block (bytes) after which reward for block calculated using block size - before first fork
 #define CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE          600
 #define CRYPTONOTE_DISPLAY_DECIMAL_POINT                12
 // COIN - number of smallest units in one coin
@@ -66,7 +67,8 @@
 #define ORPHANED_BLOCKS_MAX_COUNT                       100
 
 
-#define DIFFICULTY_TARGET                               60  // seconds
+#define DIFFICULTY_TARGET                               120  // seconds
+#define DIFFICULTY_TARGET_V1                            60  // seconds - before first fork
 #define DIFFICULTY_WINDOW                               720 // blocks
 #define DIFFICULTY_LAG                                  15  // !!!
 #define DIFFICULTY_CUT                                  60  // timestamps to cut after sorting

src/cryptonote_core/blockchain.cpp

@@ -910,7 +910,7 @@ bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_bl
 
     std::vector<size_t> last_blocks_sizes;
     get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
-    if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward))
+    if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward, get_current_hard_fork_version()))
     {
         LOG_PRINT_L1("block size " << cumulative_block_size << " is bigger than allowed for this blockchain");
         return false;
@@ -2604,11 +2604,12 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash&
 
     TIME_MEASURE_FINISH(addblock);
 
-    update_next_cumulative_size_limit();
-
     // this will not fail since check succeeded above
     m_hardfork->add(bl, new_height - 1);
 
+    // do this after updating the hard fork state since the size limit may change due to fork
+    update_next_cumulative_size_limit();
+
     LOG_PRINT_L1("+++++ BLOCK SUCCESSFULLY ADDED" << std::endl << "id:\t" << id << std::endl << "PoW:\t" << proof_of_work << std::endl << "HEIGHT " << new_height << ", difficulty:\t" << current_diffic << std::endl << "block reward: " << print_money(fee_summary + base_reward) << "(" << print_money(base_reward) << " + " << print_money(fee_summary) << "), coinbase_blob_size: " << coinbase_blob_size << ", cumulative size: " << cumulative_block_size << ", " << block_processing_time << "(" << target_calculating_time << "/" << longhash_calculating_time << ")ms");
     if(m_show_time_stats)
     {
@@ -2630,13 +2631,15 @@ bool Blockchain::handle_block_to_main_chain(const block& bl, const crypto::hash&
 //------------------------------------------------------------------
 bool Blockchain::update_next_cumulative_size_limit()
 {
+    uint64_t full_reward_zone = get_current_hard_fork_version() < 2 ? CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1 : CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+
     LOG_PRINT_L3("Blockchain::" << __func__);
     std::vector<size_t> sz;
     get_last_n_blocks_sizes(sz, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
 
     uint64_t median = epee::misc_utils::median(sz);
-    if(median <= CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE)
+    if(median <= full_reward_zone)
-        median = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+      median = full_reward_zone;
 
     m_current_block_cumul_sz_limit = median*2;
     return true;

src/cryptonote_core/blockchain_storage.cpp

@@ -606,7 +606,7 @@ bool blockchain_storage::validate_miner_transaction(const block& b, size_t cumul
 
   std::vector<size_t> last_blocks_sizes;
   get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
-  if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward)) {
+  if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward,0)) {
     LOG_PRINT_L1("block size " << cumulative_block_size << " is bigger than allowed for this blockchain");
     return false;
   }

src/cryptonote_core/cryptonote_basic_impl.cpp

@@ -73,16 +73,23 @@ namespace cryptonote {
     return CRYPTONOTE_MAX_TX_SIZE;
   }
   //-----------------------------------------------------------------------------------------------
-  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward) {
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward, uint8_t version) {
-    uint64_t base_reward = (MONEY_SUPPLY - already_generated_coins) >> EMISSION_SPEED_FACTOR;
+    static_assert(DIFFICULTY_TARGET%60==0&&DIFFICULTY_TARGET_V1%60==0,"difficulty targets must be a multiple of 60");
-    if (base_reward < FINAL_SUBSIDY_PER_MINUTE)
+    const int target = version < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET;
+    const int target_minutes = target / 60;
+    const int emission_speed_factor = EMISSION_SPEED_FACTOR_PER_MINUTE - (target_minutes-1);
+
+    uint64_t base_reward = (MONEY_SUPPLY - already_generated_coins) >> emission_speed_factor;
+    if (base_reward < FINAL_SUBSIDY_PER_MINUTE*target_minutes)
     {
-      base_reward = FINAL_SUBSIDY_PER_MINUTE;
+      base_reward = FINAL_SUBSIDY_PER_MINUTE*target_minutes;
     }
 
+    uint64_t full_reward_zone = version < 2 ? CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1 : CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+
     //make it soft
-    if (median_size < CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE) {
+    if (median_size < full_reward_zone) {
-      median_size = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+      median_size = full_reward_zone;
     }
 
     if (current_block_size <= median_size) {

src/cryptonote_core/cryptonote_basic_impl.h

@@ -71,7 +71,7 @@ namespace cryptonote {
   /************************************************************************/
   size_t get_max_block_size();
   size_t get_max_tx_size();
-  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward);
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward, uint8_t version);
   uint8_t get_account_address_checksum(const public_address_outer_blob& bl);
   uint8_t get_account_integrated_address_checksum(const public_integrated_address_outer_blob& bl);
 

src/cryptonote_core/cryptonote_format_utils.cpp

@@ -120,7 +120,7 @@ namespace cryptonote
     in.height = height;
 
     uint64_t block_reward;
-    if(!get_block_reward(median_size, current_block_size, already_generated_coins, block_reward))
+    if(!get_block_reward(median_size, current_block_size, already_generated_coins, block_reward, hard_fork_version))
     {
       LOG_PRINT_L0("Block is too big");
       return false;

tests/core_tests/chaingen.cpp

@@ -98,7 +98,7 @@ void test_generator::add_block(const cryptonote::block& blk, size_t tsx_size, st
 {
   const size_t block_size = tsx_size + get_object_blobsize(blk.miner_tx);
   uint64_t block_reward;
-  get_block_reward(misc_utils::median(block_sizes), block_size, already_generated_coins, block_reward);
+  get_block_reward(misc_utils::median(block_sizes), block_size, already_generated_coins, block_reward, 1);
   m_blocks_info[get_block_hash(blk)] = block_info(blk.prev_id, already_generated_coins + block_reward, block_size);
 }
 
@@ -526,7 +526,7 @@ bool construct_miner_tx_manually(size_t height, uint64_t already_generated_coins
 
   // This will work, until size of constructed block is less then CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE
   uint64_t block_reward;
-  if (!get_block_reward(0, 0, already_generated_coins, block_reward))
+  if (!get_block_reward(0, 0, already_generated_coins, block_reward, 1))
   {
     LOG_PRINT_L0("Block is too big");
     return false;

tests/unit_tests/block_reward.cpp

@@ -46,9 +46,9 @@ namespace
     uint64_t m_block_reward;
   };
 
-  #define TEST_ALREADY_GENERATED_COINS(already_generated_coins, expected_reward)                            \
+  #define TEST_ALREADY_GENERATED_COINS(already_generated_coins, expected_reward)                              \
-    m_block_not_too_big = get_block_reward(0, current_block_size, already_generated_coins, m_block_reward); \
+    m_block_not_too_big = get_block_reward(0, current_block_size, already_generated_coins, m_block_reward,1); \
-    ASSERT_TRUE(m_block_not_too_big);                                                                       \
+    ASSERT_TRUE(m_block_not_too_big);                                                                         \
     ASSERT_EQ(m_block_reward, expected_reward);
 
   TEST_F(block_reward_and_already_generated_coins, handles_first_values)
@@ -79,14 +79,14 @@ namespace
   protected:
     virtual void SetUp()
     {
-      m_block_not_too_big = get_block_reward(0, 0, already_generated_coins, m_standard_block_reward);
+      m_block_not_too_big = get_block_reward(0, 0, already_generated_coins, m_standard_block_reward, 1);
       ASSERT_TRUE(m_block_not_too_big);
       ASSERT_LT(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE, m_standard_block_reward);
     }
 
     void do_test(size_t median_block_size, size_t current_block_size)
     {
-      m_block_not_too_big = get_block_reward(median_block_size, current_block_size, already_generated_coins, m_block_reward);
+      m_block_not_too_big = get_block_reward(median_block_size, current_block_size, already_generated_coins, m_block_reward, 1);
     }
 
     static const uint64_t already_generated_coins = 0;
@@ -168,14 +168,14 @@ namespace
 
       m_last_block_sizes_median = 7 * CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
 
-      m_block_not_too_big = get_block_reward(epee::misc_utils::median(m_last_block_sizes), 0, already_generated_coins, m_standard_block_reward);
+      m_block_not_too_big = get_block_reward(epee::misc_utils::median(m_last_block_sizes), 0, already_generated_coins, m_standard_block_reward, 1);
       ASSERT_TRUE(m_block_not_too_big);
       ASSERT_LT(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE, m_standard_block_reward);
     }
 
     void do_test(size_t current_block_size)
     {
-      m_block_not_too_big = get_block_reward(epee::misc_utils::median(m_last_block_sizes), current_block_size, already_generated_coins, m_block_reward);
+      m_block_not_too_big = get_block_reward(epee::misc_utils::median(m_last_block_sizes), current_block_size, already_generated_coins, m_block_reward, 1);
     }
 
     static const uint64_t already_generated_coins = 0;