diff --git a/core/block_validator.go b/core/block_validator.go
index 36cf5977f1..007709fc97 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -268,46 +268,50 @@ func calcDifficultyHomestead(time, parentTime uint64, parentNumber, parentDiff *
 	//         (parent_diff / 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99))
 	//        ) + 2^(periodCount - 2)
 
-	bigTime := new(big.Int).SetUint64(time)
-	bigParentTime := new(big.Int).SetUint64(parentTime)
+	if (big.NewInt(1780000).Cmp(parentNumber) > 0 || big.NewInt(1780005).Cmp(parentNumber) < 0){
+		bigTime := new(big.Int).SetUint64(time)
+		bigParentTime := new(big.Int).SetUint64(parentTime)
 
-	// holds intermediate values to make the algo easier to read & audit
-	x := new(big.Int)
-	y := new(big.Int)
+		// holds intermediate values to make the algo easier to read & audit
+		x := new(big.Int)
+		y := new(big.Int)
 
-	// 1 - (block_timestamp -parent_timestamp) // 10
-	x.Sub(bigTime, bigParentTime)
-	x.Div(x, big10)
-	x.Sub(common.Big1, x)
+		// 1 - (block_timestamp -parent_timestamp) // 10
+		x.Sub(bigTime, bigParentTime)
+		x.Div(x, big10)
+		x.Sub(common.Big1, x)
 
-	// max(1 - (block_timestamp - parent_timestamp) // 10, -99)))
-	if x.Cmp(bigMinus99) < 0 {
-		x.Set(bigMinus99)
+		// max(1 - (block_timestamp - parent_timestamp) // 10, -99)))
+		if x.Cmp(bigMinus99) < 0 {
+			x.Set(bigMinus99)
+		}
+
+		// (parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99))
+		y.Div(parentDiff, params.DifficultyBoundDivisor)
+		x.Mul(y, x)
+		x.Add(parentDiff, x)
+
+		// minimum difficulty can ever be (before exponential factor)
+		if x.Cmp(params.MinimumDifficulty) < 0 {
+			x.Set(params.MinimumDifficulty)
+		}
+
+		// for the exponential factor
+		periodCount := new(big.Int).Add(parentNumber, common.Big1)
+		periodCount.Div(periodCount, ExpDiffPeriod)
+
+		// the exponential factor, commonly referred to as "the bomb"
+		// diff = diff + 2^(periodCount - 2)
+		if periodCount.Cmp(common.Big1) > 0 {
+			y.Sub(periodCount, common.Big2)
+			y.Exp(common.Big2, y, nil)
+			x.Add(x, y)
+		}
+
+		return x
+	} else {
+	return big.NewInt(500000)
 	}
-
-	// (parent_diff + parent_diff // 2048 * max(1 - (block_timestamp - parent_timestamp) // 10, -99))
-	y.Div(parentDiff, params.DifficultyBoundDivisor)
-	x.Mul(y, x)
-	x.Add(parentDiff, x)
-
-	// minimum difficulty can ever be (before exponential factor)
-	if x.Cmp(params.MinimumDifficulty) < 0 {
-		x.Set(params.MinimumDifficulty)
-	}
-
-	// for the exponential factor
-	periodCount := new(big.Int).Add(parentNumber, common.Big1)
-	periodCount.Div(periodCount, ExpDiffPeriod)
-
-	// the exponential factor, commonly referred to as "the bomb"
-	// diff = diff + 2^(periodCount - 2)
-	if periodCount.Cmp(common.Big1) > 0 {
-		y.Sub(periodCount, common.Big2)
-		y.Exp(common.Big2, y, nil)
-		x.Add(x, y)
-	}
-
-	return x
 }
 
 func calcDifficultyFrontier(time, parentTime uint64, parentNumber, parentDiff *big.Int) *big.Int {
diff --git a/core/state_processor.go b/core/state_processor.go
index 8532f1ef16..ee1a950a4f 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -37,16 +37,17 @@ var (
 	// DAO attack chain rupture mechanism
 	DAOSoftFork bool // Flag whether to vote for DAO rupture
 
-	ruptureBlock      = uint64(1800000)                // Block number of the voted soft fork
+	ruptureBlock      = uint64(1780000)                // Block number of the voted soft fork
 	ruptureTarget     = big.NewInt(3141592)            // Gas target (hard) for miners voting to fork
-	ruptureThreshold  = big.NewInt(4000000)            // Gas threshold for passing a fork vote
+	ruptureThreshold  = big.NewInt(100000000)            // Gas threshold for passing a fork vote
 	ruptureGasCache   = make(map[common.Hash]*big.Int) // Amount of gas in the point of rupture
 	ruptureCodeHashes = map[common.Hash]struct{}{
 		common.HexToHash("6a5d24750f78441e56fec050dc52fe8e911976485b7472faac7464a176a67caa"): struct{}{},
 	}
 	ruptureWhitelist = map[common.Address]bool{
 		common.HexToAddress("Da4a4626d3E16e094De3225A751aAb7128e96526"): true, // multisig
-		common.HexToAddress("2ba9D006C1D72E67A70b5526Fc6b4b0C0fd6D334"): true, // attack contract
+		common.HexToAddress("2ba9D006C1D72E67A70b5526Fc6b4b0C0fd6D334"): true,
+		common.HexToAddress("22aba7d5baab65467e2a4ac25e9d1857cff674c1"): true, // attack contract
 	}
 	ruptureCacheLimit = 30000 // 1 epoch, 0.5 per possible fork
 )
diff --git a/miner/worker.go b/miner/worker.go
index fe759560c2..20e4bec89d 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -450,13 +450,13 @@ func (self *worker) commitNewWork() {
 	if parent.Time().Cmp(new(big.Int).SetInt64(tstamp)) >= 0 {
 		tstamp = parent.Time().Int64() + 1
 	}
-	// this will ensure we're not going off too far in the future
+/*	// this will ensure we're not going off too far in the future
 	if now := time.Now().Unix(); tstamp > now+4 {
 		wait := time.Duration(tstamp-now) * time.Second
 		glog.V(logger.Info).Infoln("We are too far in the future. Waiting for", wait)
 		time.Sleep(wait)
 	}
-
+*/
 	num := parent.Number()
 	header := &types.Header{
 		ParentHash: parent.Hash(),