update difficulty minimum and guess

src/cryptonote_basic/difficulty.cpp

@@ -296,7 +296,7 @@ namespace cryptonote {
         
     assert(timestamps.size() == cumulative_difficulties.size() && timestamps.size() <= N+1 );
 
-   if ( height <= DIFFICULTY_HEIGHT + 1 + N ) { return DIFFICULTY_GUESS;  }
+   if ( height <= DIFFICULTY_HEIGHT + 1 ) { return DIFFICULTY_GUESS;  }
  
    // Safely convert out-of-sequence timestamps into > 0 solvetimes.
    std::vector<uint64_t>TS(N+1);
@@ -344,6 +344,12 @@ namespace cryptonote {
    if ( next_D > 100000 ) { 
     next_D = ((next_D+500)/1000)*1000 + std::min(static_cast<uint64_t>(999), (TS[N]-TS[N-10])/10); 
    }
-   return  next_D;
+
+   if ( next_D < DIFFICULTY_MINIMUM ) {
+    return static_cast<uint64_t>(DIFFICULTY_MINIMUM);
+   } 
+   else { 
+    return static_cast<uint64_t>(next_D); 
+   }
   }
 }

src/cryptonote_config.h

@@ -83,8 +83,8 @@
 #define DIFFICULTY_BLOCKS_COUNT_V2                      DIFFICULTY_WINDOW_V2 + 1 // added +1 to make N=N
 #define DIFFICULTY_BLOCKS_COUNT                         DIFFICULTY_WINDOW + DIFFICULTY_LAG
 #define DIFFICULTY_HEIGHT                               63469 // v10 fork height
-#define DIFFICULTY_GUESS                                40000000 // difficulty at fork 40m
-#define DIFFICULTY_MINIMUM                              25000000 // minimum difficulty set to 25m
+#define DIFFICULTY_GUESS                                100000069 // difficulty at fork 100m
+#define DIFFICULTY_MINIMUM                              40000069 // minimum difficulty set to 40m
 
 #define CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V1   DIFFICULTY_TARGET_V1 * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS
 #define CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V2   DIFFICULTY_TARGET_V2 * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS