diff --git a/core/genesis.go b/core/genesis.go
index a3d701f9f..9c82a28c8 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -31,7 +31,6 @@ func GenesisBlock(db ethutil.Database) *types.Block {
 	genesis.Header().GasLimit = GenesisGasLimit
 	genesis.Header().GasUsed = ethutil.Big0
 	genesis.Header().Time = 0
-	genesis.Header().SeedHash = make([]byte, 32)
 	genesis.Header().MixDigest = make([]byte, 32)
 
 	genesis.Td = ethutil.Big0
diff --git a/core/types/block.go b/core/types/block.go
index 31c7c2b87..50973c804 100644
--- a/core/types/block.go
+++ b/core/types/block.go
@@ -40,8 +40,6 @@ type Header struct {
 	Time uint64
 	// Extra data
 	Extra string
-	// SeedHash used for light client verification
-	SeedHash ethutil.Bytes
 	// Mix digest for quick checking to prevent DOS
 	MixDigest ethutil.Bytes
 	// Nonce
@@ -63,7 +61,6 @@ func (self *Header) rlpData(withNonce bool) []interface{} {
 		self.GasUsed,
 		self.Time,
 		self.Extra,
-		self.SeedHash,
 	}
 	if withNonce {
 		fields = append(fields, self.MixDigest, self.Nonce)
@@ -202,7 +199,6 @@ func (self *Block) RlpDataForStorage() interface{} {
 func (self *Block) Number() *big.Int  { return self.header.Number }
 func (self *Block) NumberU64() uint64 { return self.header.Number.Uint64() }
 func (self *Block) MixDigest() []byte { return self.header.MixDigest }
-func (self *Block) SeedHash() []byte  { return self.header.SeedHash }
 func (self *Block) Nonce() uint64 {
 	return binary.BigEndian.Uint64(self.header.Nonce)
 }
@@ -281,10 +277,9 @@ func (self *Header) String() string {
 	GasUsed:	    %v
 	Time:		    %v
 	Extra:		    %v
-	SeedHash:           %x
 	MixDigest:          %x
 	Nonce:		    %x`,
-		self.ParentHash, self.UncleHash, self.Coinbase, self.Root, self.TxHash, self.ReceiptHash, self.Bloom, self.Difficulty, self.Number, self.GasLimit, self.GasUsed, self.Time, self.Extra, self.SeedHash, self.MixDigest, self.Nonce)
+		self.ParentHash, self.UncleHash, self.Coinbase, self.Root, self.TxHash, self.ReceiptHash, self.Bloom, self.Difficulty, self.Number, self.GasLimit, self.GasUsed, self.Time, self.Extra, self.MixDigest, self.Nonce)
 }
 
 type Blocks []*Block
diff --git a/miner/worker.go b/miner/worker.go
index 7ef113fd4..5c4a13698 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -7,7 +7,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethutil"
@@ -154,7 +153,6 @@ func (self *worker) wait() {
 			if block.Number().Uint64() == work.Number && block.Nonce() == 0 {
 				self.current.block.SetNonce(work.Nonce)
 				self.current.block.Header().MixDigest = work.MixDigest
-				self.current.block.Header().SeedHash = work.SeedHash
 
 				jsonlogger.LogJson(&logger.EthMinerNewBlock{
 					BlockHash:     ethutil.Bytes2Hex(block.Hash()),
@@ -191,8 +189,6 @@ func (self *worker) commitNewWork() {
 	defer self.mu.Unlock()
 
 	block := self.chain.NewBlock(self.coinbase)
-	seednum := ethash.GetSeedBlockNum(block.NumberU64())
-	block.Header().SeedHash = self.chain.GetBlockByNumber(seednum).SeedHash()
 
 	self.current = env(block, self.eth)
 	parent := self.chain.GetBlock(self.current.block.ParentHash())
diff --git a/pow/block.go b/pow/block.go
index 3bc63978b..136e4bf8d 100644
--- a/pow/block.go
+++ b/pow/block.go
@@ -11,7 +11,6 @@ type Block interface {
 	HashNoNonce() []byte
 	Nonce() uint64
 	MixDigest() []byte
-	SeedHash() []byte
 	NumberU64() uint64
 }