diff --git a/core/genesis.go b/core/genesis.go
index e73141aed1..0cf6bad0fa 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -309,10 +309,12 @@ func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big
 func DefaultGenesisBlock() *Genesis {
 	return &Genesis{
 		Config:     params.MainnetChainConfig,
-		Nonce:      66,
-		ExtraData:  hexutil.MustDecode("0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa"),
-		GasLimit:   5000,
-		Difficulty: big.NewInt(17179869184),
+		Nonce:      2184,
+		Timestamp:  1485633600,
+		ExtraData:  hexutil.MustDecode("0x4a756d6275636b734545"),
+		GasLimit:   134217728,
+		Difficulty: big.NewInt(80000000000),
+		Coinbase:   common.StringToAddress("3333333333333333333333333333333333333333"),
 		Alloc:      decodePrealloc(mainnetAllocData),
 	}
 }
@@ -321,10 +323,10 @@ func DefaultGenesisBlock() *Genesis {
 func DefaultTestnetGenesisBlock() *Genesis {
 	return &Genesis{
 		Config:     params.TestnetChainConfig,
-		Nonce:      66,
-		ExtraData:  hexutil.MustDecode("0x3535353535353535353535353535353535353535353535353535353535353535"),
-		GasLimit:   16777216,
-		Difficulty: big.NewInt(1048576),
+		Nonce:      273,
+		ExtraData:  hexutil.MustDecode("0x4a756d6275636b734545"),
+		GasLimit:   134217728,
+		Difficulty: big.NewInt(983040),
 		Alloc:      decodePrealloc(testnetAllocData),
 	}
 }