From 2ba9de01cb1f1ebaee4b88a23b6ab8329559b577 Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Mon, 9 Jul 2018 22:15:27 -1100
Subject: [PATCH] 7250 diff cap.16 hardfork for PoS

---
 src/komodo_bitcoind.h | 11 +++++++++--
 src/miner.cpp         | 11 +++++++++--
 src/pow.cpp           | 15 +++++++++++++--
 3 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/komodo_bitcoind.h b/src/komodo_bitcoind.h
index a3077828a..1a679c485 100644
--- a/src/komodo_bitcoind.h
+++ b/src/komodo_bitcoind.h
@@ -1159,6 +1159,13 @@ uint32_t komodo_newstake(int32_t validateflag,arith_uint256 bnTarget,int32_t nHe
     }
     if ( nHeight < 4400 ) // POSTEST64 change newstake to stake and stake to oldstake and remove
         bnTarget.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+    else if ( nHeight >= 7250 )
+    {
+        bnMaxPoSdiff.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+        bnMaxPoSdiff = (bnMaxPoSdiff / arith_uint256(16));
+        if ( bnTarget < bnMaxPoSdiff )
+            bnTarget = bnMaxPoSdiff;
+    }
     mfactor = 1024;
     if ( (minage= nHeight*3) > 6000 ) // about 100 blocks
         minage = 6000;
@@ -1491,8 +1498,8 @@ int32_t komodo_checkPOW(int32_t slowflag,CBlock *pblock,int32_t height)
         {
             if ( KOMODO_TEST_ASSETCHAIN_SKIP_POW )
                 return(0);
-            //fprintf(stderr,"pow violation and no chance it is notary ht.%d %s\n",height,hash.ToString().c_str());
-            return(-1);
+            if ( ASSETCHAINS_STAKED == 0 ) // komodo_is_PoSblock will check bnTarget
+                return(-1);
         }
     }
     if ( ASSETCHAINS_STAKED != 0 && height >= 2 ) // must PoS or have at least 16x better PoW
diff --git a/src/miner.cpp b/src/miner.cpp
index bbcbf6643..bc56df370 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -856,7 +856,7 @@ void static BitcoinMiner()
             //
             // Search
             //
-            uint8_t pubkeys[66][33]; uint32_t blocktimes[66]; int mids[256],nonzpkeys,i,j,externalflag; uint32_t savebits; int64_t nStart = GetTime();
+            uint8_t pubkeys[66][33]; arith_uint256 bnMaxPoSdiff; uint32_t blocktimes[66]; int mids[256],nonzpkeys,i,j,externalflag; uint32_t savebits; int64_t nStart = GetTime();
             savebits = pblock->nBits;
             HASHTarget = arith_uint256().SetCompact(pblock->nBits);
             roundrobin_delay = ROUNDROBIN_DELAY;
@@ -911,10 +911,17 @@ void static BitcoinMiner()
                     } //else fprintf(stderr,"duplicate at j.%d\n",j);
                 } else Mining_start = 0;
             } else Mining_start = 0;
-            if ( ASSETCHAINS_STAKED != 0 && GetArg("-genproclimit", 0) == 0 )
+            if ( ASSETCHAINS_STAKED != 0 )
             {
                 int32_t percPoS,z;
                 HASHTarget_POW = komodo_PoWtarget(&percPoS,HASHTarget,Mining_height,ASSETCHAINS_STAKED);
+                if ( Mining_height >= 7250 )
+                {
+                    bnMaxPoSdiff.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+                    bnMaxPoSdiff = (bnMaxPoSdiff / arith_uint256(16));
+                    if ( HASHtarget < bnMaxPoSdiff )
+                        HASHtarget = bnMaxPoSdiff;
+                }
                 if ( ASSETCHAINS_STAKED < 100 )
                 {
                     for (z=31; z>=0; z--)
diff --git a/src/pow.cpp b/src/pow.cpp
index a6117b35c..39204f7f9 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -190,8 +190,19 @@ bool CheckProofOfWork(int32_t height,uint8_t *pubkey33,uint256 hash,unsigned int
     }
     if (fNegative || bnTarget == 0 || fOverflow || bnTarget > UintToArith256(params.powLimit))
         return error("CheckProofOfWork(): nBits below minimum work");
-    if (  ASSETCHAINS_STAKED != 0 && height >= 4200 && height < 4400 ) // POSTEST64 remove this
-        bnTarget.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+    if (  ASSETCHAINS_STAKED != 0 )
+    {
+        if ( height >= 4200 && height < 4400 )
+            bnTarget.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+        else if ( height >= 7250 )
+        {
+            arith_uint256 bnMaxPoSdiff;
+            bnMaxPoSdiff.SetCompact(KOMODO_MINDIFF_NBITS,&fNegative,&fOverflow);
+            bnMaxPoSdiff = (bnMaxPoSdiff / arith_uint256(16));
+            if ( bnTarget < bnMaxPoSdiff )
+                bnTarget = bnMaxPoSdiff;
+        }
+    }
     // Check proof of work matches claimed amount
     if ( UintToArith256(hash) > bnTarget )
     {