diff --git a/core/genesis.go b/core/genesis.go
index e0b15347ce..c6491a8983 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -312,7 +312,7 @@ func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big
 func DefaultGenesisBlock() *Genesis {
 	return &Genesis{
 		Config:     params.MainnetChainConfig,
-		Nonce:      0xC261220,
+		Nonce:      66,
 		GasLimit:   5000,
 		Difficulty: big.NewInt(17179869184),
 		Alloc:      decodePrealloc(mainnetAllocData),
diff --git a/core/genesis.json b/core/genesis.json
index 768b1718e3..341e8d2275 100644
--- a/core/genesis.json
+++ b/core/genesis.json
@@ -7,13 +7,13 @@
         "eip155Block": 0,
         "eip158Block": 0
     },
-    "nonce": "0x000000000c261220",
+    "nonce": "66",
     "difficulty": "17179869184",
     "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000", 
     "coinbase": "0x0000000000000000000000000000000000000000", 
     "timestamp": "0x00",
     "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000", 
-    "extraData": "0x", 
+    "extraData": "0x",
     "gasLimit": "5000",
     "alloc": {
         "06219483E217c9aD479f76a95426f689eF4D5951": {
diff --git a/params/config.go b/params/config.go
index 5e4faf9169..a29df9a7de 100644
--- a/params/config.go
+++ b/params/config.go
@@ -31,10 +31,10 @@ var (
 var (
 	// MainnetChainConfig is the chain parameters to run a node on the main network.
 	MainnetChainConfig = &ChainConfig{
-		ChainId:             big.NewInt(1),
+		ChainId:             big.NewInt(24122000),
 		HomesteadBlock:      big.NewInt(0),
 		DAOForkBlock:        nil,
-		DAOForkSupport:      false,
+		DAOForkSupport:      true,
 		EIP150Block:         big.NewInt(0),
 		EIP150Hash:          common.HexToHash("0x3f9c0f661c8b2aab93eafda1c97daed0d418c87cd300292ebcc1f7e03df0d8f3"),
 		EIP155Block:         big.NewInt(0),