Merge pull request #490

baf101e More changes for 2-min blocks Use the correct block time for realtime fuzz on locktime Use the correct block time to calculate next_difficulty on alt chains (will not work as-is with voting) Lock unit tests to original block time for now (Javier Smooth)
4fea1a5 Adjust difficulty target (2 min) and full reward zone (60 kbytes) for block version 2 (Javier Smooth)

1 files changed, 13 insertions, 6 deletions

diff --git a/src/cryptonote_core/cryptonote_basic_impl.cpp b/src/cryptonote_core/cryptonote_basic_impl.cpp
index bd0b8a304..73e8d8fb9 100644
--- a/src/cryptonote_core/cryptonote_basic_impl.cpp
+++ b/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) {
-    uint64_t base_reward = (MONEY_SUPPLY - already_generated_coins) >> EMISSION_SPEED_FACTOR;
-    if (base_reward < FINAL_SUBSIDY_PER_MINUTE)
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward, uint8_t version) {
+    static_assert(DIFFICULTY_TARGET%60==0&&DIFFICULTY_TARGET_V1%60==0,"difficulty targets must be a multiple of 60");
+    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) {
-      median_size = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE;
+    if (median_size < full_reward_zone) {
+      median_size = full_reward_zone;
     }
 
     if (current_block_size <= median_size) {