Topic: New Ixcoin fork -> I0coin - page 46. (Read 217144 times)

diff -Nur I0coinClientv1.0-linux-stable-orig/src/main.cpp I0coinClientv1.0-linux-stable-dev/src/main.cpp
--- I0coinClientv1.0-linux-stable-orig/src/main.cpp 2011-08-18 23:15:50.000000000 +0200
+++ I0coinClientv1.0-linux-stable-dev/src/main.cpp 2011-08-25 08:23:52.143725519 +0200
@@ -644,7 +644,7 @@
     return nSubsidy + nFees;
 }
 
-unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast)
+unsigned int static GetNextWorkRequired_OLD(const CBlockIndex* pindexLast)
 {
     const int64 nTargetTimespan = 7 * 24 * 60 * 60; // two weeks
     const int64 nTargetSpacing = 5 * 60;
@@ -659,6 +659,7 @@
     // Only change once per interval
  if ( nRemaining != 0)
  {
+/* HORRIBLY BROKEN, *NEVER* use time() in here
  const CBlockIndex* pindexFirst = pindexLast;
  for (int i = 0; pindexFirst && i < nRemaining-1; i++)
  pindexFirst = pindexFirst->pprev;
@@ -666,6 +667,7 @@
 
  int64 rema = GetAdjustedTime() - pindexFirst->GetBlockTime();
  if(rema < nTargetTimespan)
+*/
  return pindexLast->nBits;
  }
 
@@ -691,6 +693,71 @@
 
     if (bnNew > bnProofOfWorkLimit)
         bnNew = bnProofOfWorkLimit;
+
+    /// debug print
+    printf("GetNextWorkRequired RETARGET\n");
+    printf("nTargetTimespan = %"PRI64d"    nActualTimespan = %"PRI64d"\n", nTargetTimespan, nActualTimespan);
+    printf("Before: %08x  %s\n", pindexLast->nBits, CBigNum().SetCompact(pindexLast->nBits).getuint256().ToString().c_str());
+    printf("After:  %08x  %s\n", bnNew.GetCompact(), bnNew.getuint256().ToString().c_str());
+
+    return bnNew.GetCompact();
+}
+
+//blatantly stolen from SolidCoin
+unsigned int static GetNextWorkRequired(const CBlockIndex* pindexLast)
+{
+    const int64 nTargetTimespan = 12 * 60 * 60; // 12 hours
+    const int64 nTargetSpacing = 3 * 60;    //3 minute blocks
+    const int64 nInterval = nTargetTimespan / nTargetSpacing;
+
+    // Genesis block
+    if (pindexLast == NULL)
+        return bnProofOfWorkLimit.GetCompact();
+
+//okay, maybe not this line
+    if ((pindexLast->nHeight+1) < 14640)
+        return GetNextWorkRequired_OLD(pindexLast);
+
+    // Only change once per interval
+    if ((pindexLast->nHeight+1) % nInterval != 0)
+        return pindexLast->nBits;
+
+    // Go back by what we want to be 14 days worth of blocks
+    const CBlockIndex* pindexFirst = pindexLast;
+    for (int i = 0; pindexFirst && i < nInterval-1; i++)
+        pindexFirst = pindexFirst->pprev;
+    assert(pindexFirst);
+
+    // Limit adjustment step
+    int64 nActualTimespan = pindexLast->GetBlockTime() - pindexFirst->GetBlockTime();
+    int64 nTwoPercent = nTargetTimespan/50;
+    //printf("  nActualTimespan = %"PRI64d"  before bounds\n", nActualTimespan);
+
+    if (nActualTimespan < nTargetTimespan)  //is time taken for a block less than 3minutes?
+    {
+         //limit increase to a much lower amount than dictates to get past the pump-n-dump mining phase
+        //due to retargets being done more often it also needs to be lowered significantly from the 4x increase
+        if(nActualTimespan<(nTwoPercent*16)) //less than a minute?
+            nActualTimespan=(nTwoPercent*45); //pretend it was only 10% faster than desired
+        else if(nActualTimespan<(nTwoPercent*32)) //less than 2 minutes?
+            nActualTimespan=(nTwoPercent*47); //pretend it was only 6% faster than desired
+        else
+            nActualTimespan=(nTwoPercent*49); //pretend it was only 2% faster than desired
+
+        //int64 nTime=nTargetTimespan-nActualTimespan;
+        //nActualTimespan = nTargetTimespan/2;
+    }
+    else if (nActualTimespan > nTargetTimespan*4)   nActualTimespan = nTargetTimespan*4;
+
+    // Retarget
+    CBigNum bnNew;
+    bnNew.SetCompact(pindexLast->nBits);
+    bnNew *= nActualTimespan;
+    bnNew /= nTargetTimespan;
+
+
+    if (bnNew > bnProofOfWorkLimit)
+        bnNew = bnProofOfWorkLimit;
 
     /// debug print
     printf("GetNextWorkRequired RETARGET\n");