diff --git a/ethchain/state.go b/ethchain/state.go
index be25fe7b4..b9c2c576d 100644
--- a/ethchain/state.go
+++ b/ethchain/state.go
@@ -112,6 +112,10 @@ func (s *State) Cmp(other *State) bool {
 	return s.trie.Cmp(other.trie)
 }
 
+func (s *State) Copy() *State {
+	return NewState(s.trie.Copy())
+}
+
 type ObjType byte
 
 const (
diff --git a/ethchain/state_manager.go b/ethchain/state_manager.go
index c01084fc6..3be940745 100644
--- a/ethchain/state_manager.go
+++ b/ethchain/state_manager.go
@@ -266,7 +266,7 @@ func (sm *StateManager) ValidateBlock(block *Block) error {
 
 	// Verify the nonce of the block. Return an error if it's not valid
 	if !sm.Pow.Verify(block.HashNoNonce(), block.Difficulty, block.Nonce) {
-		return ValidationError("Block's nonce is invalid (= %v)", block.Nonce)
+		return ValidationError("Block's nonce is invalid (= %v)", ethutil.Hex(block.Nonce))
 	}
 
 	return nil
diff --git a/peer.go b/peer.go
index 89b567fb6..4e927ada4 100644
--- a/peer.go
+++ b/peer.go
@@ -301,6 +301,7 @@ func (p *Peer) HandleInbound() {
 						if ethutil.Config.Debug {
 							ethutil.Config.Log.Infof("[PEER] Block %x failed\n", block.Hash())
 							ethutil.Config.Log.Infof("[PEER] %v\n", err)
+							ethutil.Config.Log.Infoln(block)
 						}
 						break
 					} else {