Add intervening v5 fork for increased min block size

Minimum mixin 4 and enforced ringct is moved from v5 to v6.
v5 is now used for an increased minimum block size (from 60000
to 300000) to cater for larger typical/minimum transaction size.

The fee algorithm is also changed to decrease the base per kB
fee, and add a cheap tier for those transactions which we do
not care if they get delayed (or even included in a block).

2 files changed, 11 insertions, 1 deletions

diff --git a/src/cryptonote_basic/cryptonote_basic_impl.cpp b/src/cryptonote_basic/cryptonote_basic_impl.cpp
index 243ae4059..fb9e25c00 100644
--- a/src/cryptonote_basic/cryptonote_basic_impl.cpp
+++ b/src/cryptonote_basic/cryptonote_basic_impl.cpp
@@ -67,6 +67,15 @@ namespace cryptonote {
   /* Cryptonote helper functions                                          */
   /************************************************************************/
   //-----------------------------------------------------------------------------------------------
+  size_t get_min_block_size(uint8_t version)
+  {
+    if (version < 2)
+      return CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1;
+    if (version < 5)
+      return CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2;
+    return CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5;
+  }
+  //-----------------------------------------------------------------------------------------------
   size_t get_max_block_size()
   {
     return CRYPTONOTE_MAX_BLOCK_SIZE;
@@ -89,7 +98,7 @@ namespace cryptonote {
       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_V2;
+    uint64_t full_reward_zone = get_min_block_size(version);
 
     //make it soft
     if (median_size < full_reward_zone) {
diff --git a/src/cryptonote_basic/cryptonote_basic_impl.h b/src/cryptonote_basic/cryptonote_basic_impl.h
index 542ee6c4e..46974330b 100644
--- a/src/cryptonote_basic/cryptonote_basic_impl.h
+++ b/src/cryptonote_basic/cryptonote_basic_impl.h
@@ -69,6 +69,7 @@ namespace cryptonote {
   /************************************************************************/
   /* Cryptonote helper functions                                          */
   /************************************************************************/
+  size_t get_min_block_size(uint8_t version);
   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, uint8_t version);