From b2f2806055c90f6956db6c89bfdc3df65b95d6b6 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Wed, 27 May 2015 00:11:54 +0200
Subject: [PATCH 1/2] cmd/geth, core: Updated DB version & seedhash debug
 method

---
 cmd/geth/admin.go       | 25 ++++++++++++++++++++++++-
 core/block_processor.go |  5 ++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/cmd/geth/admin.go b/cmd/geth/admin.go
index 28786553c..8f9a009d7 100644
--- a/cmd/geth/admin.go
+++ b/cmd/geth/admin.go
@@ -88,6 +88,7 @@ func (js *jsre) adminBindings() {
 	debug.Set("getBlockRlp", js.getBlockRlp)
 	debug.Set("setHead", js.setHead)
 	debug.Set("processBlock", js.debugBlock)
+	debug.Set("seedhash", js.seedHash)
 	// undocumented temporary
 	debug.Set("waitForBlocks", js.waitForBlocks)
 }
@@ -118,6 +119,27 @@ func (js *jsre) getBlock(call otto.FunctionCall) (*types.Block, error) {
 	return block, nil
 }
 
+func (js *jsre) seedHash(call otto.FunctionCall) otto.Value {
+	if len(call.ArgumentList) > 0 {
+		if call.Argument(0).IsNumber() {
+			num, _ := call.Argument(0).ToInteger()
+			hash, err := ethash.GetSeedHash(uint64(num))
+			if err != nil {
+				fmt.Println(err)
+				return otto.UndefinedValue()
+			}
+			v, _ := call.Otto.ToValue(fmt.Sprintf("0x%x", hash))
+			return v
+		} else {
+			fmt.Println("arg not a number")
+		}
+	} else {
+		fmt.Println("requires number argument")
+	}
+
+	return otto.UndefinedValue()
+}
+
 func (js *jsre) pendingTransactions(call otto.FunctionCall) otto.Value {
 	txs := js.ethereum.TxPool().GetTransactions()
 
@@ -220,10 +242,11 @@ func (js *jsre) debugBlock(call otto.FunctionCall) otto.Value {
 	vm.Debug = true
 	_, err = js.ethereum.BlockProcessor().RetryProcess(block)
 	if err != nil {
-		glog.Infoln(err)
+		fmt.Println(err)
 	}
 	vm.Debug = old
 
+	fmt.Println("ok")
 	return otto.UndefinedValue()
 }
 
diff --git a/core/block_processor.go b/core/block_processor.go
index 3f10e5efd..037782407 100644
--- a/core/block_processor.go
+++ b/core/block_processor.go
@@ -21,7 +21,7 @@ import (
 const (
 	// must be bumped when consensus algorithm is changed, this forces the upgradedb
 	// command to be run (forces the blocks to be imported again using the new algorithm)
-	BlockChainVersion = 2
+	BlockChainVersion = 3
 )
 
 var receiptsPre = []byte("receipts-")
@@ -159,6 +159,9 @@ func (sm *BlockProcessor) RetryProcess(block *types.Block) (logs state.Logs, err
 		return nil, ParentError(header.ParentHash)
 	}
 	parent := sm.bc.GetBlock(header.ParentHash)
+	if !sm.Pow.Verify(block) {
+		return nil, ValidationError("Block's nonce is invalid (= %x)", block.Nonce)
+	}
 
 	return sm.processWithParent(block, parent)
 }

From 222249e622cd552b0500051fbbcbfb00a5366da4 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Wed, 27 May 2015 01:36:59 +0200
Subject: [PATCH 2/2] cmd/geth: Flush instead of close. This solves a nil ptr
 error

---
 cmd/geth/main.go | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 9d935efbd..742dae10f 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -533,9 +533,9 @@ func importchain(ctx *cli.Context) {
 	}
 
 	// force database flush
-	ethereum.BlockDb().Close()
-	ethereum.StateDb().Close()
-	ethereum.ExtraDb().Close()
+	ethereum.BlockDb().Flush()
+	ethereum.StateDb().Flush()
+	ethereum.ExtraDb().Flush()
 
 	fmt.Printf("Import done in %v", time.Since(start))
 
@@ -630,9 +630,9 @@ func upgradeDb(ctx *cli.Context) {
 	}
 
 	// force database flush
-	ethereum.BlockDb().Close()
-	ethereum.StateDb().Close()
-	ethereum.ExtraDb().Close()
+	ethereum.BlockDb().Flush()
+	ethereum.StateDb().Flush()
+	ethereum.ExtraDb().Flush()
 
 	os.Remove(exportFile)