3 files changed, 14 insertions, 9 deletions
diff --git a/pow/block.go b/pow/block.go
index eb07bc86e..3bc63978b 100644
--- a/pow/block.go
+++ b/pow/block.go
@@ -1,14 +1,15 @@
 package pow
 
 import (
-	"github.com/ethereum/go-ethereum/core/types"
 	"math/big"
+
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 type Block interface {
 	Difficulty() *big.Int
 	HashNoNonce() []byte
-	Nonce() []byte
+	Nonce() uint64
 	MixDigest() []byte
 	SeedHash() []byte
 	NumberU64() uint64
diff --git a/pow/ezp/pow.go b/pow/ezp/pow.go
index 49854c3d0..3ca502d06 100644
--- a/pow/ezp/pow.go
+++ b/pow/ezp/pow.go
@@ -1,11 +1,11 @@
 package ezp
 
 import (
+	"encoding/binary"
 	"math/big"
 	"math/rand"
 	"time"
 
-	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/crypto/sha3"
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/logger"
@@ -32,7 +32,7 @@ func (pow *EasyPow) Turbo(on bool) {
 	pow.turbo = on
 }
 
-func (pow *EasyPow) Search(block pow.Block, stop <-chan struct{}) ([]byte, []byte, []byte) {
+func (pow *EasyPow) Search(block pow.Block, stop <-chan struct{}) (uint64, []byte, []byte) {
 	r := rand.New(rand.NewSource(time.Now().UnixNano()))
 	hash := block.HashNoNonce()
 	diff := block.Difficulty()
@@ -57,7 +57,7 @@ empty:
 	for {
 		select {
 		case <-stop:
-			return nil, nil, nil
+			return 0, nil, nil
 		default:
 			i++
 
@@ -65,7 +65,7 @@ empty:
 			hashes := ((float64(1e9) / float64(elapsed)) * float64(i-starti)) / 1000
 			pow.HashRate = int64(hashes)
 
-			sha := crypto.Sha3(big.NewInt(r.Int63()).Bytes())
+			sha := uint64(r.Int63())
 			if verify(hash, diff, sha) {
 				return sha, nil, nil
 			}
@@ -75,16 +75,20 @@ empty:
 			time.Sleep(20 * time.Microsecond)
 		}
 	}
+
+	return 0, nil, nil
 }
 
 func (pow *EasyPow) Verify(block pow.Block) bool {
 	return Verify(block)
 }
 
-func verify(hash []byte, diff *big.Int, nonce []byte) bool {
+func verify(hash []byte, diff *big.Int, nonce uint64) bool {
 	sha := sha3.NewKeccak256()
 
-	d := append(hash, nonce...)
+	n := make([]byte, 8)
+	binary.PutUvarint(n, nonce)
+	d := append(hash, n...)
 	sha.Write(d)
 
 	verification := new(big.Int).Div(ethutil.BigPow(2, 256), diff)
diff --git a/pow/pow.go b/pow/pow.go
index 11aecbd6b..3908e5f76 100644
--- a/pow/pow.go
+++ b/pow/pow.go
@@ -1,7 +1,7 @@
 package pow
 
 type PoW interface {
-	Search(block Block, stop <-chan struct{}) ([]byte, []byte, []byte)
+	Search(block Block, stop <-chan struct{}) (uint64, []byte, []byte)
 	Verify(block Block) bool
 	GetHashrate() int64
 	Turbo(bool)