diff --git a/blockpool/blockpool.go b/blockpool/blockpool.go
index e65032fb557245f50951cdd27c2c8908e11bf70c..79b6f8cc06f3478fa061122fe0c878987612beb7 100644
--- a/blockpool/blockpool.go
+++ b/blockpool/blockpool.go
@@ -622,6 +622,8 @@ func (self *BlockPool) AddBlock(block *types.Block, peerId string) {
 
 	entry := self.get(hash)
 
+	fmt.Println("block number", block.Number())
+	defer fmt.Println("AddBlock done")
 	// a peer's current head block is appearing the first time
 	if hash == sender.currentBlockHash {
 		if sender.currentBlock == nil {
diff --git a/core/block_processor.go b/core/block_processor.go
index 6b18d4cf9b2fc7a0963fc2a30c418bb9b9ffb27f..39134c63e03b74f63fc94bc40a9a52673fa28d09 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -268,15 +268,15 @@ func (sm *BlockProcessor) ValidateHeader(block, parent *types.Header) error {
 		return BlockNumberErr
 	}
 
+	if block.Time <= parent.Time {
+		return BlockEqualTSErr //ValidationError("Block timestamp equal or less than previous block (%v - %v)", block.Time, parent.Time)
+	}
+
 	// Verify the nonce of the block. Return an error if it's not valid
 	if !sm.Pow.Verify(types.NewBlockWithHeader(block)) {
 		return ValidationError("Block's nonce is invalid (= %x)", block.Nonce)
 	}
 
-	if block.Time <= parent.Time {
-		return BlockEqualTSErr //ValidationError("Block timestamp equal or less than previous block (%v - %v)", block.Time, parent.Time)
-	}
-
 	return nil
 }
 
diff --git a/core/chain_manager.go b/core/chain_manager.go
index 7b4034b63a5109e463690cf350d5f604af4fec47..2a5d2f2c5af7549ee68a3eb7e75e0ba1b0a51f1e 100644
--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -437,21 +437,20 @@ type queueEvent struct {
 }
 
 func (self *ChainManager) procFutureBlocks() {
-	self.futureBlocks.mu.Lock()
-
 	blocks := make([]*types.Block, len(self.futureBlocks.blocks))
 	for i, hash := range self.futureBlocks.hashes {
 		blocks[i] = self.futureBlocks.Get(hash)
 	}
-	self.futureBlocks.mu.Unlock()
 
 	types.BlockBy(types.Number).Sort(blocks)
 	self.InsertChain(blocks)
 }
 
 func (self *ChainManager) InsertChain(chain types.Blocks) error {
-	//self.tsmu.Lock()
-	//defer self.tsmu.Unlock()
+	if len(chain) > 0 {
+		fmt.Println("insert chain", len(chain))
+		defer fmt.Println("insert chain done")
+	}
 
 	// A queued approach to delivering events. This is generally faster than direct delivery and requires much less mutex acquiring.
 	var queue = make([]interface{}, len(chain))
@@ -472,23 +471,17 @@ func (self *ChainManager) InsertChain(chain types.Blocks) error {
 			// Do not penelise on future block. We'll need a block queue eventually that will queue
 			// future block for future use
 			if err == BlockFutureErr {
+				fmt.Println("added future block", block.Number())
 				self.futureBlocks.Push(block)
 				continue
 			}
 
 			if IsParentErr(err) && self.futureBlocks.Has(block.ParentHash()) {
+				fmt.Println("added future block 2", block.Number())
 				self.futureBlocks.Push(block)
 				continue
 			}
 
-			/*
-				if err == BlockEqualTSErr {
-					//queue[i] = ChainSideEvent{block, logs}
-					// XXX silently discard it?
-					continue
-				}
-			*/
-
 			h := block.Header()
 			chainlogger.Errorf("INVALID block #%v (%x)\n", h.Number, h.Hash().Bytes()[:4])
 			chainlogger.Errorln(err)