diff --git a/blockdag/blocknode.go b/blockdag/blocknode.go
index 0f233941f..f28e024c2 100644
--- a/blockdag/blocknode.go
+++ b/blockdag/blocknode.go
@@ -102,7 +102,6 @@ type blockNode struct {
 	nonce                uint64
 	timestamp            int64
 	hashMerkleRoot       *daghash.Hash
-	idMerkleRoot         *daghash.Hash
 	acceptedIDMerkleRoot *daghash.Hash
 	utxoCommitment       *daghash.Hash
 
@@ -131,7 +130,6 @@ func initBlockNode(node *blockNode, blockHeader *wire.BlockHeader, parents block
 		node.nonce = blockHeader.Nonce
 		node.timestamp = blockHeader.Timestamp.Unix()
 		node.hashMerkleRoot = blockHeader.HashMerkleRoot
-		node.idMerkleRoot = blockHeader.IDMerkleRoot
 		node.acceptedIDMerkleRoot = blockHeader.AcceptedIDMerkleRoot
 		node.utxoCommitment = blockHeader.UTXOCommitment
 	} else {
@@ -183,7 +181,6 @@ func (node *blockNode) Header() *wire.BlockHeader {
 		Version:              node.version,
 		ParentHashes:         node.ParentHashes(),
 		HashMerkleRoot:       node.hashMerkleRoot,
-		IDMerkleRoot:         node.idMerkleRoot,
 		AcceptedIDMerkleRoot: node.acceptedIDMerkleRoot,
 		UTXOCommitment:       node.utxoCommitment,
 		Timestamp:            time.Unix(node.timestamp, 0),
diff --git a/blockdag/common_test.go b/blockdag/common_test.go
index 7384ed9ae..1a661523d 100644
--- a/blockdag/common_test.go
+++ b/blockdag/common_test.go
@@ -205,7 +205,6 @@ func newTestNode(parents blockSet, blockVersion int32, bits uint32, timestamp ti
 		Bits:                 bits,
 		Timestamp:            timestamp,
 		HashMerkleRoot:       &daghash.ZeroHash,
-		IDMerkleRoot:         &daghash.ZeroHash,
 		AcceptedIDMerkleRoot: &daghash.ZeroHash,
 		UTXOCommitment:       &daghash.ZeroHash,
 	}
diff --git a/blockdag/dag_test.go b/blockdag/dag_test.go
index 731974a91..d9a19cf76 100644
--- a/blockdag/dag_test.go
+++ b/blockdag/dag_test.go
@@ -174,8 +174,7 @@ func TestHaveBlock(t *testing.T) {
 	}
 
 	// Insert an orphan block.
-	isOrphan, err = dag.ProcessBlock(util.NewBlock(&Block100000),
-		BFNoPoWCheck)
+	isOrphan, err = dag.ProcessBlock(util.NewBlock(&Block100000), BFNoPoWCheck)
 	if err != nil {
 		t.Fatalf("Unable to process block: %v", err)
 	}
@@ -192,10 +191,10 @@ func TestHaveBlock(t *testing.T) {
 		{hash: dagconfig.SimNetParams.GenesisHash.String(), want: true},
 
 		// Block 3b should be present (as a second child of Block 2).
-		{hash: "6733a86f4e3a46c0d4df76d6fbfab88eacadf8e44f54eb544a18d6b95570510c", want: true},
+		{hash: "3f2ded16b7115e69a48cee5f4be743ff23ad8d41da16d059c38cc83d14459863", want: true},
 
 		// Block 100000 should be present (as an orphan).
-		{hash: "18bcf45b8c0dbccd7690a728f3486c6d5fc84971688f89f4554297b6a278e554", want: true},
+		{hash: "4e530ee9f967de3b2cd47ac5cd00109bb9ed7b0e30a60485c94badad29ecb4ce", want: true},
 
 		// Random hashes should not be available.
 		{hash: "123", want: false},
@@ -555,7 +554,6 @@ func chainedNodes(parents blockSet, numNodes int) []*blockNode {
 		// synthetic tests to work.
 		header := wire.BlockHeader{
 			Nonce:                testNoncePrng.Uint64(),
-			IDMerkleRoot:         &daghash.ZeroHash,
 			HashMerkleRoot:       &daghash.ZeroHash,
 			AcceptedIDMerkleRoot: &daghash.ZeroHash,
 			UTXOCommitment:       &daghash.ZeroHash,
@@ -919,7 +917,6 @@ func TestValidateFeeTransaction(t *testing.T) {
 				Bits:                 dag.genesis.Header().Bits,
 				ParentHashes:         parentHashes,
 				HashMerkleRoot:       BuildHashMerkleTreeStore(utilTxs).Root(),
-				IDMerkleRoot:         BuildIDMerkleTreeStore(utilTxs).Root(),
 				AcceptedIDMerkleRoot: acceptedIDMerkleRoot,
 				UTXOCommitment:       &daghash.ZeroHash,
 			},
diff --git a/blockdag/dagio.go b/blockdag/dagio.go
index 06d2bab73..edf78eca9 100644
--- a/blockdag/dagio.go
+++ b/blockdag/dagio.go
@@ -623,7 +623,6 @@ func (dag *BlockDAG) deserializeBlockNode(blockRow []byte) (*blockNode, error) {
 		nonce:                header.Nonce,
 		timestamp:            header.Timestamp.Unix(),
 		hashMerkleRoot:       header.HashMerkleRoot,
-		idMerkleRoot:         header.IDMerkleRoot,
 		acceptedIDMerkleRoot: header.AcceptedIDMerkleRoot,
 		utxoCommitment:       header.UTXOCommitment,
 	}
diff --git a/blockdag/example_test.go b/blockdag/example_test.go
index 994c12071..a3f797e50 100644
--- a/blockdag/example_test.go
+++ b/blockdag/example_test.go
@@ -67,5 +67,5 @@ func ExampleBlockDAG_ProcessBlock() {
 	fmt.Printf("Block accepted. Is it an orphan?: %v", isOrphan)
 
 	// Output:
-	// Failed to process block: already have block 5804d0207bdbfd88dd035271fab95944585eb57017b0709d5a0a10a7edb37795
+	// Failed to process block: already have block 63bbcfdd699ffd8cb19878564b14d3af8ba4d7ee4d1dd54925a7c21d5b5b5fdc
 }
diff --git a/blockdag/merkle_test.go b/blockdag/merkle_test.go
index 573a33da4..4fc09a8d7 100644
--- a/blockdag/merkle_test.go
+++ b/blockdag/merkle_test.go
@@ -5,6 +5,7 @@
 package blockdag
 
 import (
+	"github.com/daglabs/btcd/util/daghash"
 	"testing"
 
 	"github.com/daglabs/btcd/util"
@@ -24,8 +25,11 @@ func TestMerkle(t *testing.T) {
 
 	idMerkleTree := BuildIDMerkleTreeStore(block.Transactions())
 	calculatedIDMerkleRoot := idMerkleTree.Root()
-	wantIDMerkleRoot := Block100000.Header.IDMerkleRoot
-	if !wantIDMerkleRoot.IsEqual(calculatedIDMerkleRoot) {
+	wantIDMerkleRoot, err := daghash.NewHashFromStr("65308857c92c4e5dd3c5e61b73d6b78a87456b5f8f16b13c1e02c47768a0b881")
+	if err != nil {
+		t.Errorf("BuildIDMerkleTreeStore: unexpected error: %s", err)
+	}
+	if !calculatedIDMerkleRoot.IsEqual(wantIDMerkleRoot) {
 		t.Errorf("BuildIDMerkleTreeStore: ID merkle root mismatch - "+
 			"got %v, want %v", calculatedIDMerkleRoot, wantIDMerkleRoot)
 	}
diff --git a/blockdag/testdata/blk_0_to_4.dat b/blockdag/testdata/blk_0_to_4.dat
index 67e4e3077..10a82ca25 100644
Binary files a/blockdag/testdata/blk_0_to_4.dat and b/blockdag/testdata/blk_0_to_4.dat differ
diff --git a/blockdag/testdata/blk_3A.dat b/blockdag/testdata/blk_3A.dat
index 77b98c2ff..8bdda0902 100644
Binary files a/blockdag/testdata/blk_3A.dat and b/blockdag/testdata/blk_3A.dat differ
diff --git a/blockdag/testdata/blk_3B.dat b/blockdag/testdata/blk_3B.dat
index eaf5ff6c3..ac21c8108 100644
Binary files a/blockdag/testdata/blk_3B.dat and b/blockdag/testdata/blk_3B.dat differ
diff --git a/blockdag/testdata/blk_3C.dat b/blockdag/testdata/blk_3C.dat
index a33cd8267..57ef5b56e 100644
Binary files a/blockdag/testdata/blk_3C.dat and b/blockdag/testdata/blk_3C.dat differ
diff --git a/blockdag/testdata/blk_3D.dat b/blockdag/testdata/blk_3D.dat
index 0251c5062..8c856d15f 100644
Binary files a/blockdag/testdata/blk_3D.dat and b/blockdag/testdata/blk_3D.dat differ
diff --git a/blockdag/validate.go b/blockdag/validate.go
index 02eeaf625..e3fb94a9f 100644
--- a/blockdag/validate.go
+++ b/blockdag/validate.go
@@ -563,15 +563,6 @@ func (dag *BlockDAG) checkBlockSanity(block *util.Block, flags BehaviorFlags) er
 		return ruleError(ErrBadMerkleRoot, str)
 	}
 
-	idMerkleTree := BuildIDMerkleTreeStore(block.Transactions())
-	calculatedIDMerkleRoot := idMerkleTree.Root()
-	if !header.IDMerkleRoot.IsEqual(calculatedIDMerkleRoot) {
-		str := fmt.Sprintf("block ID merkle root is invalid - block "+
-			"header indicates %s, but calculated value is %s",
-			header.IDMerkleRoot, calculatedIDMerkleRoot)
-		return ruleError(ErrBadMerkleRoot, str)
-	}
-
 	// Check for duplicate transactions.  This check will be fairly quick
 	// since the transaction IDs are already cached due to building the
 	// merkle tree above.
diff --git a/blockdag/validate_test.go b/blockdag/validate_test.go
index 01b2a31bd..3f95599cf 100644
--- a/blockdag/validate_test.go
+++ b/blockdag/validate_test.go
@@ -222,12 +222,6 @@ func TestCheckBlockSanity(t *testing.T) {
 				0x48, 0x3e, 0x8b, 0xe1, 0xcf, 0xdc, 0x20, 0xba,
 				0xae, 0xec, 0x0a, 0x2f, 0xe4, 0x85, 0x31, 0x30,
 			},
-			IDMerkleRoot: &daghash.Hash{
-				0x4e, 0x06, 0xba, 0x64, 0xd7, 0x61, 0xda, 0x25,
-				0x1a, 0x0e, 0x21, 0xd4, 0x64, 0x49, 0x02, 0xa2,
-				0x80, 0xf7, 0x00, 0xe3, 0x16, 0x3d, 0x04, 0x95,
-				0x5b, 0x7e, 0xaf, 0x84, 0x7e, 0x1b, 0x6b, 0x06,
-			},
 			AcceptedIDMerkleRoot: &daghash.Hash{
 				0x80, 0xf7, 0x00, 0xe3, 0x16, 0x3d, 0x04, 0x95,
 				0x5b, 0x7e, 0xaf, 0x84, 0x7e, 0x1b, 0x6b, 0x06,
@@ -242,7 +236,7 @@ func TestCheckBlockSanity(t *testing.T) {
 			},
 			Timestamp: time.Unix(0x5cd18053, 0),
 			Bits:      0x207fffff,
-			Nonce:     0x0,
+			Nonce:     0x1,
 		},
 		Transactions: []*wire.MsgTx{
 			{
@@ -526,7 +520,7 @@ func TestCheckSerializedHeight(t *testing.T) {
 		msgTx := coinbaseTx.Copy()
 		msgTx.TxIn[0].SignatureScript = test.sigScript
 
-		msgBlock := wire.NewMsgBlock(wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0))
+		msgBlock := wire.NewMsgBlock(wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0))
 		msgBlock.AddTransaction(msgTx)
 		block := util.NewBlock(msgBlock)
 		block.SetHeight(test.wantHeight)
@@ -634,7 +628,6 @@ func TestValidateParents(t *testing.T) {
 	c := generateNode(genesisNode)
 
 	fakeBlockHeader := &wire.BlockHeader{
-		IDMerkleRoot:         &daghash.ZeroHash,
 		HashMerkleRoot:       &daghash.ZeroHash,
 		AcceptedIDMerkleRoot: &daghash.ZeroHash,
 		UTXOCommitment:       &daghash.ZeroHash,
@@ -770,12 +763,6 @@ var Block100000 = wire.MsgBlock{
 			0x6f, 0x22, 0xfa, 0x60, 0x36, 0x80, 0x99, 0xc3,
 			0x6e, 0x39, 0x14, 0x9b, 0xcc, 0x1f, 0x31, 0xa9,
 		},
-		IDMerkleRoot: &daghash.Hash{
-			0x81, 0xb8, 0xa0, 0x68, 0x77, 0xc4, 0x02, 0x1e,
-			0x3c, 0xb1, 0x16, 0x8f, 0x5f, 0x6b, 0x45, 0x87,
-			0x8a, 0xb7, 0xd6, 0x73, 0x1b, 0xe6, 0xc5, 0xd3,
-			0x5d, 0x4e, 0x2c, 0xc9, 0x57, 0x88, 0x30, 0x65,
-		},
 		AcceptedIDMerkleRoot: &daghash.Hash{
 			0x8a, 0xb7, 0xd6, 0x73, 0x1b, 0xe6, 0xc5, 0xd3,
 			0x5d, 0x4e, 0x2c, 0xc9, 0x57, 0x88, 0x30, 0x65,
@@ -1068,12 +1055,6 @@ var BlockWithWrongTxOrder = wire.MsgBlock{
 			0xf3, 0x2d, 0xd1, 0x05, 0x64, 0xb5, 0x16, 0x76,
 			0xe4, 0x66, 0x7d, 0x51, 0x53, 0x18, 0x6d, 0xb1,
 		},
-		IDMerkleRoot: &daghash.Hash{
-			0x0b, 0x79, 0xf5, 0x29, 0x6d, 0x1c, 0xaa, 0x90,
-			0x2f, 0x01, 0xd4, 0x83, 0x9b, 0x2a, 0x04, 0x5e,
-			0xa0, 0x69, 0x2d, 0x16, 0xb5, 0xd7, 0xe4, 0xf3,
-			0xcd, 0xc7, 0xc9, 0xaf, 0xfb, 0xd2, 0x1b, 0x85,
-		},
 		AcceptedIDMerkleRoot: &daghash.Hash{
 			0xa0, 0x69, 0x2d, 0x16, 0xb5, 0xd7, 0xe4, 0xf3,
 			0xcd, 0xc7, 0xc9, 0xaf, 0xfb, 0xd2, 0x1b, 0x85,
@@ -1088,7 +1069,7 @@ var BlockWithWrongTxOrder = wire.MsgBlock{
 		},
 		Timestamp: time.Unix(0x5cd16eaa, 0),
 		Bits:      0x207fffff,
-		Nonce:     0x2,
+		Nonce:     0x0,
 	},
 	Transactions: []*wire.MsgTx{
 		{
diff --git a/btcjson/dagsvrresults.go b/btcjson/dagsvrresults.go
index d4e84c5d4..48336fb5c 100644
--- a/btcjson/dagsvrresults.go
+++ b/btcjson/dagsvrresults.go
@@ -16,7 +16,6 @@ type GetBlockHeaderVerboseResult struct {
 	Version              int32    `json:"version"`
 	VersionHex           string   `json:"versionHex"`
 	HashMerkleRoot       string   `json:"hashMerkleRoot"`
-	IDMerkleRoot         string   `json:"idMerkleRoot"`
 	AcceptedIDMerkleRoot string   `json:"acceptedIdMerkleRoot"`
 	Time                 int64    `json:"time"`
 	Nonce                uint64   `json:"nonce"`
@@ -37,7 +36,6 @@ type GetBlockVerboseResult struct {
 	Version              int32         `json:"version"`
 	VersionHex           string        `json:"versionHex"`
 	HashMerkleRoot       string        `json:"hashMerkleRoot"`
-	IDMerkleRoot         string        `json:"idMerkleRoot"`
 	AcceptedIDMerkleRoot string        `json:"acceptedIdMerkleRoot"`
 	Tx                   []string      `json:"tx,omitempty"`
 	RawTx                []TxRawResult `json:"rawRx,omitempty"`
diff --git a/dagconfig/genesis.go b/dagconfig/genesis.go
index fb0910ced..2d90e2def 100644
--- a/dagconfig/genesis.go
+++ b/dagconfig/genesis.go
@@ -41,10 +41,10 @@ var genesisCoinbaseTx = wire.NewNativeMsgTx(1, genesisTxIns, genesisTxOuts)
 // genesisHash is the hash of the first block in the block chain for the main
 // network (genesis block).
 var genesisHash = daghash.Hash([daghash.HashSize]byte{
-	0x95, 0x77, 0xb3, 0xed, 0xa7, 0x10, 0x0a, 0x5a,
-	0x9d, 0x70, 0xb0, 0x17, 0x70, 0xb5, 0x5e, 0x58,
-	0x44, 0x59, 0xb9, 0xfa, 0x71, 0x52, 0x03, 0xdd,
-	0x88, 0xfd, 0xdb, 0x7b, 0x20, 0xd0, 0x04, 0x58,
+	0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25,
+	0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+	0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+	0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 })
 
 // genesisMerkleRoot is the hash of the first transaction in the genesis block
@@ -63,12 +63,11 @@ var genesisBlock = wire.MsgBlock{
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{},
 		HashMerkleRoot:       &genesisMerkleRoot,
-		IDMerkleRoot:         &genesisMerkleRoot,
 		AcceptedIDMerkleRoot: &daghash.Hash{},
 		UTXOCommitment:       &daghash.Hash{},
-		Timestamp:            time.Unix(0x5cd83da0, 0),
+		Timestamp:            time.Unix(0x5cdac4b0, 0),
 		Bits:                 0x207fffff,
-		Nonce:                0x1,
+		Nonce:                0x0,
 	},
 	Transactions: []*wire.MsgTx{genesisCoinbaseTx},
 }
@@ -119,10 +118,10 @@ var devNetGenesisCoinbaseTx = genesisCoinbaseTx
 // devGenesisHash is the hash of the first block in the block chain for the development
 // network (genesis block).
 var devNetGenesisHash = daghash.Hash([daghash.HashSize]byte{
-	0x53, 0x68, 0x95, 0xd4, 0xf7, 0xc7, 0x3b, 0x94,
-	0x64, 0xfa, 0x98, 0xc7, 0xcb, 0x92, 0x53, 0x71,
-	0x5e, 0x14, 0xd1, 0x83, 0x01, 0xd4, 0x1e, 0x17,
-	0xd4, 0xc4, 0xd3, 0x50, 0xa7, 0x64, 0x00, 0x00,
+	0xab, 0x03, 0xe2, 0x8e, 0xd4, 0x66, 0xf9, 0x75,
+	0x21, 0xd8, 0x8b, 0x49, 0xb2, 0xb4, 0xeb, 0xc6,
+	0x4a, 0x03, 0xbf, 0x9b, 0x41, 0xcb, 0x36, 0x79,
+	0x33, 0x03, 0xc4, 0x4d, 0x37, 0x17, 0x00, 0x00,
 })
 
 // devNetGenesisMerkleRoot is the hash of the first transaction in the genesis block
@@ -136,12 +135,11 @@ var devNetGenesisBlock = wire.MsgBlock{
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{},
 		HashMerkleRoot:       &devNetGenesisMerkleRoot,
-		IDMerkleRoot:         &devNetGenesisMerkleRoot,
 		AcceptedIDMerkleRoot: &daghash.Hash{},
 		UTXOCommitment:       &daghash.Hash{},
-		Timestamp:            time.Unix(0x5cd83da0, 0),
+		Timestamp:            time.Unix(0x5cdac4b0, 0),
 		Bits:                 0x1e7fffff,
-		Nonce:                0xfe2a,
+		Nonce:                0xc79c,
 	},
 	Transactions: []*wire.MsgTx{devNetGenesisCoinbaseTx},
 }
diff --git a/dagconfig/genesis_test.go b/dagconfig/genesis_test.go
index b3eddfff0..b98fb2c12 100644
--- a/dagconfig/genesis_test.go
+++ b/dagconfig/genesis_test.go
@@ -121,39 +121,35 @@ func TestSimNetGenesisBlock(t *testing.T) {
 // genesisBlockBytes are the wire encoded bytes for the genesis block of the
 // main network as of protocol version 60002.
 var genesisBlockBytes = []byte{
-	0x01, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xdc, 0x8b,
-	0xb8, 0x76, 0x57, 0x9d, 0x7d, 0xe9, 0x9d, 0xae,
-	0xdb, 0xf8, 0x22, 0xd2, 0x0d, 0xa2, 0xe0, 0xbb,
-	0xbe, 0xed, 0xb0, 0xdb, 0xba, 0xeb, 0x18, 0x4d,
-	0x42, 0x01, 0xff, 0xed, 0x9d, 0xd4, 0xdc, 0x8b,
-	0xb8, 0x76, 0x57, 0x9d, 0x7d, 0xe9, 0x9d, 0xae,
-	0xdb, 0xf8, 0x22, 0xd2, 0x0d, 0xa2, 0xe0, 0xbb,
-	0xbe, 0xed, 0xb0, 0xdb, 0xba, 0xeb, 0x18, 0x4d,
-	0x42, 0x01, 0xff, 0xed, 0x9d, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x3d, 0xd8,
-	0x5c, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7f,
-	0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff,
-	0xff, 0xff, 0xff, 0x0e, 0x00, 0x00, 0x0b, 0x2f,
-	0x50, 0x32, 0x53, 0x48, 0x2f, 0x62, 0x74, 0x63,
-	0x64, 0x2f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-	0xff, 0xff, 0x01, 0x00, 0xf2, 0x05, 0x2a, 0x01,
-	0x00, 0x00, 0x00, 0x01, 0x51, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00,
+	0x01, 0x00, 0x00, 0x00, 0x00, 0xd4, 0xdc, 0x8b, /* |........| */
+	0xb8, 0x76, 0x57, 0x9d, 0x7d, 0xe9, 0x9d, 0xae, /* |.vW.}...| */
+	0xdb, 0xf8, 0x22, 0xd2, 0x0d, 0xa2, 0xe0, 0xbb, /* |..".....| */
+	0xbe, 0xed, 0xb0, 0xdb, 0xba, 0xeb, 0x18, 0x4d, /* |.......M| */
+	0x42, 0x01, 0xff, 0xed, 0x9d, 0x00, 0x00, 0x00, /* |B.......| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0xb0, 0xc4, 0xda, /* |........| */
+	0x5c, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7f, /* |\.......| */
+	0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* | .......| */
+	0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, /* |........| */
+	0xff, 0xff, 0xff, 0x0e, 0x00, 0x00, 0x0b, 0x2f, /* |......./| */
+	0x50, 0x32, 0x53, 0x48, 0x2f, 0x62, 0x74, 0x63, /* |P2SH/btc| */
+	0x64, 0x2f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* |d/......| */
+	0xff, 0xff, 0x01, 0x00, 0xf2, 0x05, 0x2a, 0x01, /* |......*.| */
+	0x00, 0x00, 0x00, 0x01, 0x51, 0x00, 0x00, 0x00, /* |....Q...| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* |........| */
+	0x00, /* |.| */
 }
 
 // regTestGenesisBlockBytes are the wire encoded bytes for the genesis block of
diff --git a/database/example_test.go b/database/example_test.go
index b5cc906af..93b1afcd1 100644
--- a/database/example_test.go
+++ b/database/example_test.go
@@ -175,5 +175,5 @@ func Example_blockStorageAndRetrieval() {
 	fmt.Printf("Serialized block size: %d bytes\n", len(loadedBlockBytes))
 
 	// Output:
-	// Serialized block size: 257 bytes
+	// Serialized block size: 225 bytes
 }
diff --git a/database/ffldb/blockio_test.go b/database/ffldb/blockio_test.go
index 6fd57063b..3d380501c 100644
--- a/database/ffldb/blockio_test.go
+++ b/database/ffldb/blockio_test.go
@@ -16,7 +16,7 @@ import (
 
 func TestDeleteFile(t *testing.T) {
 	testBlock := util.NewBlock(wire.NewMsgBlock(
-		wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
+		wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
 
 	tests := []struct {
 		fileNum     uint32
@@ -69,7 +69,7 @@ func TestDeleteFile(t *testing.T) {
 // and makes sure no panic occurs, as well as ensures the writeCursor was updated correctly.
 func TestHandleRollbackErrors(t *testing.T) {
 	testBlock := util.NewBlock(wire.NewMsgBlock(
-		wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
+		wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
 
 	testBlockSize := uint32(testBlock.MsgBlock().SerializeSize())
 	tests := []struct {
diff --git a/database/ffldb/db_test.go b/database/ffldb/db_test.go
index 021e9e10f..9086f7857 100644
--- a/database/ffldb/db_test.go
+++ b/database/ffldb/db_test.go
@@ -553,7 +553,7 @@ func TestForEachBucket(t *testing.T) {
 // TestStoreBlockErrors tests all error-cases in *tx.StoreBlock().
 // The non-error-cases are tested in the more general tests.
 func TestStoreBlockErrors(t *testing.T) {
-	testBlock := util.NewBlock(wire.NewMsgBlock(wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
+	testBlock := util.NewBlock(wire.NewMsgBlock(wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)))
 
 	tests := []struct {
 		name        string
@@ -716,7 +716,7 @@ func TestWritePendingAndCommitErrors(t *testing.T) {
 	rollbackCalled = false
 	err = pdb.Update(func(dbTx database.Tx) error {
 		return dbTx.StoreBlock(util.NewBlock(wire.NewMsgBlock(
-			wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0))))
+			wire.NewBlockHeader(1, []*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0))))
 	})
 	if err == nil {
 		t.Errorf("No error returned when blockIdx.Put() should have returned an error")
diff --git a/database/testdata/blocks1-256.bz2 b/database/testdata/blocks1-256.bz2
index ad970d813..41874ec34 100644
Binary files a/database/testdata/blocks1-256.bz2 and b/database/testdata/blocks1-256.bz2 differ
diff --git a/database/testdata/generator.go b/database/testdata/generator.go
index 239e9e20a..d31ca7e85 100644
--- a/database/testdata/generator.go
+++ b/database/testdata/generator.go
@@ -47,7 +47,6 @@ func generateBlock(parent *wire.MsgBlock) *wire.MsgBlock {
 			Version:              1,
 			ParentHashes:         []*daghash.Hash{parent.BlockHash()},
 			HashMerkleRoot:       &genesisMerkleRoot,
-			IDMerkleRoot:         &daghash.ZeroHash,
 			AcceptedIDMerkleRoot: &daghash.ZeroHash,
 			UTXOCommitment:       &daghash.ZeroHash,
 			Timestamp:            time.Unix(0x5b28c4c8, 0), // 2018-06-19 08:54:32 +0000 UTC
diff --git a/integration/rpctest/blockgen.go b/integration/rpctest/blockgen.go
index d44b3c2e7..da02ca018 100644
--- a/integration/rpctest/blockgen.go
+++ b/integration/rpctest/blockgen.go
@@ -183,13 +183,11 @@ func CreateBlock(parentBlock *util.Block, inclusionTxs []*util.Tx,
 		blockTxns = append(blockTxns, inclusionTxs...)
 	}
 	hashMerkleTree := blockdag.BuildHashMerkleTreeStore(blockTxns)
-	idMerkleTree := blockdag.BuildIDMerkleTreeStore(blockTxns)
 	var block wire.MsgBlock
 	block.Header = wire.BlockHeader{
 		Version:              blockVersion,
 		ParentHashes:         []*daghash.Hash{parentHash},
 		HashMerkleRoot:       hashMerkleTree.Root(),
-		IDMerkleRoot:         idMerkleTree.Root(),
 		AcceptedIDMerkleRoot: &daghash.ZeroHash,
 		UTXOCommitment:       &daghash.ZeroHash,
 		Timestamp:            ts,
diff --git a/mempool/estimatefee_test.go b/mempool/estimatefee_test.go
index 51f3a5a0c..83a07c91d 100644
--- a/mempool/estimatefee_test.go
+++ b/mempool/estimatefee_test.go
@@ -71,7 +71,6 @@ func (eft *estimateFeeTester) newBlock(txs []*wire.MsgTx) {
 
 	block := util.NewBlock(&wire.MsgBlock{
 		Header: wire.BlockHeader{
-			IDMerkleRoot:         &daghash.ZeroHash,
 			HashMerkleRoot:       &daghash.ZeroHash,
 			AcceptedIDMerkleRoot: &daghash.ZeroHash,
 			UTXOCommitment:       &daghash.ZeroHash,
diff --git a/mining/mining.go b/mining/mining.go
index 71a65b83a..d85af6968 100644
--- a/mining/mining.go
+++ b/mining/mining.go
@@ -652,7 +652,6 @@ func (g *BlkTmplGenerator) NewBlockTemplate(payToAddress util.Address) (*BlockTe
 
 	// Create a new block ready to be solved.
 	hashMerkleTree := blockdag.BuildHashMerkleTreeStore(blockTxns)
-	idMerkleTree := blockdag.BuildIDMerkleTreeStore(blockTxns)
 	acceptedIDMerkleRoot, err := g.dag.NextAcceptedIDMerkleRoot()
 	if err != nil {
 		return nil, err
@@ -662,7 +661,6 @@ func (g *BlkTmplGenerator) NewBlockTemplate(payToAddress util.Address) (*BlockTe
 		Version:              nextBlockVersion,
 		ParentHashes:         g.dag.TipHashes(),
 		HashMerkleRoot:       hashMerkleTree.Root(),
-		IDMerkleRoot:         idMerkleTree.Root(),
 		AcceptedIDMerkleRoot: acceptedIDMerkleRoot,
 		UTXOCommitment:       &daghash.ZeroHash,
 		Timestamp:            ts,
@@ -747,8 +745,6 @@ func (g *BlkTmplGenerator) UpdateExtraNonce(msgBlock *wire.MsgBlock, blockHeight
 	block := util.NewBlock(msgBlock)
 	hashMerkleTree := blockdag.BuildHashMerkleTreeStore(block.Transactions())
 	msgBlock.Header.HashMerkleRoot = hashMerkleTree.Root()
-	idMerkleTree := blockdag.BuildIDMerkleTreeStore(block.Transactions())
-	msgBlock.Header.IDMerkleRoot = idMerkleTree.Root()
 
 	return nil
 }
diff --git a/mining/simulator/mineloop.go b/mining/simulator/mineloop.go
index 889adecb7..93ae55d1a 100644
--- a/mining/simulator/mineloop.go
+++ b/mining/simulator/mineloop.go
@@ -37,7 +37,7 @@ func parseBlock(template *btcjson.GetBlockTemplateResult) (*util.Block, error) {
 	bits := uint32(bitsInt64)
 
 	// parse rest of block
-	msgBlock := wire.NewMsgBlock(wire.NewBlockHeader(template.Version, parentHashes, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, uint32(bits), 0))
+	msgBlock := wire.NewMsgBlock(wire.NewBlockHeader(template.Version, parentHashes, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, uint32(bits), 0))
 
 	for i, txResult := range append([]btcjson.GetBlockTemplateResultTx{*template.CoinbaseTxn}, template.Transactions...) {
 		reader := hex.NewDecoder(strings.NewReader(txResult.Data))
@@ -127,7 +127,6 @@ func solveLoop(newTemplateChan chan *btcjson.GetBlockTemplateResult, foundBlock
 		msgBlock := block.MsgBlock()
 
 		msgBlock.Header.HashMerkleRoot = blockdag.BuildHashMerkleTreeStore(block.Transactions()).Root()
-		msgBlock.Header.IDMerkleRoot = blockdag.BuildIDMerkleTreeStore(block.Transactions()).Root()
 
 		go solveBlock(block, stopOldTemplateSolving, foundBlock)
 	}
diff --git a/mining/test_utils.go b/mining/test_utils.go
index 706c465dd..b5271273d 100644
--- a/mining/test_utils.go
+++ b/mining/test_utils.go
@@ -115,7 +115,6 @@ func PrepareBlockForTest(dag *blockdag.BlockDAG, params *dagconfig.Params, paren
 			utilTxs[i] = util.NewTx(tx)
 		}
 		template.Block.Header.HashMerkleRoot = blockdag.BuildHashMerkleTreeStore(utilTxs).Root()
-		template.Block.Header.IDMerkleRoot = blockdag.BuildIDMerkleTreeStore(utilTxs).Root()
 
 		acceptedIDMerkleRoot, err := dag.NextAcceptedIDMerkleRoot()
 		if err != nil {
diff --git a/peer/peer_test.go b/peer/peer_test.go
index 5c28974b8..e6893d315 100644
--- a/peer/peer_test.go
+++ b/peer/peer_test.go
@@ -494,7 +494,7 @@ func TestPeerListeners(t *testing.T) {
 		{
 			"OnBlock",
 			wire.NewMsgBlock(wire.NewBlockHeader(1,
-				[]*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 1, 1)),
+				[]*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 1, 1)),
 		},
 		{
 			"OnInv",
@@ -560,7 +560,7 @@ func TestPeerListeners(t *testing.T) {
 		{
 			"OnMerkleBlock",
 			wire.NewMsgMerkleBlock(wire.NewBlockHeader(1,
-				[]*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 1, 1)),
+				[]*daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 1, 1)),
 		},
 		// only one version message is allowed
 		// only one verack message is allowed
diff --git a/server/rpc/rpcserver.go b/server/rpc/rpcserver.go
index 6dbde4a47..661eca64a 100644
--- a/server/rpc/rpcserver.go
+++ b/server/rpc/rpcserver.go
@@ -1198,7 +1198,6 @@ func handleGetBlock(s *Server, cmd interface{}, closeChan <-chan struct{}) (inte
 		Version:              blockHeader.Version,
 		VersionHex:           fmt.Sprintf("%08x", blockHeader.Version),
 		HashMerkleRoot:       blockHeader.HashMerkleRoot.String(),
-		IDMerkleRoot:         blockHeader.IDMerkleRoot.String(),
 		AcceptedIDMerkleRoot: blockHeader.AcceptedIDMerkleRoot.String(),
 		ParentHashes:         daghash.Strings(blockHeader.ParentHashes),
 		Nonce:                blockHeader.Nonce,
@@ -1401,7 +1400,6 @@ func handleGetBlockHeader(s *Server, cmd interface{}, closeChan <-chan struct{})
 		Version:              blockHeader.Version,
 		VersionHex:           fmt.Sprintf("%08x", blockHeader.Version),
 		HashMerkleRoot:       blockHeader.HashMerkleRoot.String(),
-		IDMerkleRoot:         blockHeader.IDMerkleRoot.String(),
 		AcceptedIDMerkleRoot: blockHeader.AcceptedIDMerkleRoot.String(),
 		NextHashes:           nextHashStrings,
 		ParentHashes:         daghash.Strings(blockHeader.ParentHashes),
@@ -1680,8 +1678,6 @@ func (state *gbtWorkState) updateBlockTemplate(s *Server, useCoinbaseValue bool)
 			block := util.NewBlock(template.Block)
 			hashMerkleTree := blockdag.BuildHashMerkleTreeStore(block.Transactions())
 			template.Block.Header.HashMerkleRoot = hashMerkleTree.Root()
-			idMerkleTree := blockdag.BuildIDMerkleTreeStore(block.Transactions())
-			template.Block.Header.IDMerkleRoot = idMerkleTree.Root()
 		}
 
 		// Set locals for convenience.
diff --git a/server/rpc/rpcserverhelp.go b/server/rpc/rpcserverhelp.go
index ea2d0e525..284c7dee9 100644
--- a/server/rpc/rpcserverhelp.go
+++ b/server/rpc/rpcserverhelp.go
@@ -242,7 +242,6 @@ var helpDescsEnUS = map[string]string{
 	"getBlockVerboseResult-version":              "The block version",
 	"getBlockVerboseResult-versionHex":           "The block version in hexadecimal",
 	"getBlockVerboseResult-hashMerkleRoot":       "Merkle tree reference to hash of all transactions for the block",
-	"getBlockVerboseResult-idMerkleRoot":         "Merkle tree reference to hash of all transactions' IDs for the block",
 	"getBlockVerboseResult-acceptedIdMerkleRoot": "Merkle tree reference to hash all transactions accepted form the block blues",
 	"getBlockVerboseResult-tx":                   "The transaction hashes (only when verbosetx=false)",
 	"getBlockVerboseResult-rawRx":                "The transactions as JSON objects (only when verbosetx=true)",
@@ -277,7 +276,6 @@ var helpDescsEnUS = map[string]string{
 	"getBlockHeaderVerboseResult-version":              "The block version",
 	"getBlockHeaderVerboseResult-versionHex":           "The block version in hexadecimal",
 	"getBlockHeaderVerboseResult-hashMerkleRoot":       "Merkle tree reference to hash of all transactions for the block",
-	"getBlockHeaderVerboseResult-idMerkleRoot":         "Merkle tree reference to hash of all transactions' IDs for the block",
 	"getBlockHeaderVerboseResult-acceptedIdMerkleRoot": "Merkle tree reference to hash all transactions accepted form the block blues",
 	"getBlockHeaderVerboseResult-time":                 "The block time in seconds since 1 Jan 1970 GMT",
 	"getBlockHeaderVerboseResult-nonce":                "The block nonce",
diff --git a/util/block_test.go b/util/block_test.go
index 2f2973c47..bfb25e859 100644
--- a/util/block_test.go
+++ b/util/block_test.go
@@ -38,7 +38,7 @@ func TestBlock(t *testing.T) {
 	}
 
 	// Hash for block 100,000.
-	wantHashStr := "df1b3cc747f665f36df84bdaa54a9ea695fbe12e102156fc1fc61d89366bc2d7"
+	wantHashStr := "839a8e072e6d402128f6f9a32ffc012e471e071e8ef8405552b1e58ef7b681f0"
 	wantHash, err := daghash.NewHashFromStr(wantHashStr)
 	if err != nil {
 		t.Errorf("NewHashFromStr: %v", err)
@@ -147,10 +147,10 @@ func TestBlock(t *testing.T) {
 
 	// Transaction offsets and length for the transaction in Block100000.
 	wantTxLocs := []wire.TxLoc{
-		{TxStart: 218, TxLen: 163},
-		{TxStart: 381, TxLen: 287},
-		{TxStart: 668, TxLen: 285},
-		{TxStart: 953, TxLen: 253},
+		{TxStart: 186, TxLen: 163},
+		{TxStart: 349, TxLen: 287},
+		{TxStart: 636, TxLen: 285},
+		{TxStart: 921, TxLen: 253},
 	}
 
 	// Ensure the transaction location information is accurate.
@@ -259,7 +259,7 @@ func TestBlockErrors(t *testing.T) {
 	}
 
 	// Truncate the block byte buffer to force errors.
-	shortBytes := block100000Bytes[:218]
+	shortBytes := block100000Bytes[:186]
 	_, err = util.NewBlockFromBytes(shortBytes)
 	if err != io.EOF {
 		t.Errorf("NewBlockFromBytes: did not get expected error - "+
@@ -325,12 +325,6 @@ var Block100000 = wire.MsgBlock{
 			0x28, 0xc3, 0x06, 0x7c, 0xc3, 0x8d, 0x48, 0x85,
 			0xef, 0xb5, 0xa4, 0xac, 0x42, 0x47, 0xe9, 0xf3,
 		}, // f3e94742aca4b5ef85488dc37c06c3282295ffec960994b2c0d5ac2a25a95766
-		IDMerkleRoot: &daghash.Hash{
-			0x66, 0x57, 0xa9, 0x25, 0x2a, 0xac, 0xd5, 0xc0,
-			0xb2, 0x94, 0x09, 0x96, 0xec, 0xff, 0x95, 0x22,
-			0x28, 0xc3, 0x06, 0x7c, 0xc3, 0x8d, 0x48, 0x85,
-			0xef, 0xb5, 0xa4, 0xac, 0x42, 0x47, 0xe9, 0xf3,
-		}, // f3e94742aca4b5ef85488dc37c06c3282295ffec960994b2c0d5ac2a25a95766
 		AcceptedIDMerkleRoot: &daghash.Hash{
 			0x28, 0xc3, 0x06, 0x7c, 0xc3, 0x8d, 0x48, 0x85,
 			0xef, 0xb5, 0xa4, 0xac, 0x42, 0x47, 0xe9, 0xf3,
diff --git a/util/bloom/filter_test.go b/util/bloom/filter_test.go
index 9509e9baf..8e490f98b 100644
--- a/util/bloom/filter_test.go
+++ b/util/bloom/filter_test.go
@@ -537,9 +537,6 @@ func TestFilterInsertP2PubKeyOnly(t *testing.T) {
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, 0x65, 0x9C, 0x79, // HashMerkleRoot
 		0x3C, 0xE3, 0x70, 0xD9, 0x5F, 0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11,
 		0x7B, 0x3C, 0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, 0x65, 0x9C, 0x79, // Fake IDMerkleRoot. TODO: (Ori) Replace to a real IDMerkleRoot
-		0x3C, 0xE3, 0x70, 0xD9, 0x5F, 0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11,
-		0x7B, 0x3C, 0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x3C, 0xE3, 0x70, 0xD9, 0x5F, 0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, // AcceptedIDMerkleRoot
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, 0x65, 0x9C, 0x79,
 		0x7B, 0x3C, 0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
diff --git a/util/bloom/merkleblock_test.go b/util/bloom/merkleblock_test.go
index 0ebbac165..ccce48497 100644
--- a/util/bloom/merkleblock_test.go
+++ b/util/bloom/merkleblock_test.go
@@ -25,9 +25,6 @@ func TestMerkleBlock3(t *testing.T) {
 		0xB5, 0x0C, 0xC0, 0x69, 0xD6, 0xA3, 0xE3, 0x3E, 0x3F, 0xF8, 0x4A, // HashMerkleRoot
 		0x5C, 0x41, 0xD9, 0xD3, 0xFE, 0xBE, 0x7C, 0x77, 0x0F, 0xDC, 0xC9,
 		0x6B, 0x2C, 0x3F, 0xF6, 0x0A, 0xBE, 0x18, 0x4F, 0x19, 0x63,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, 0x65, 0x9C, 0x79, // Fake IDMerkleRoot. TODO: (Ori) Replace to a real IDMerkleRoot
-		0x3C, 0xE3, 0x70, 0xD9, 0x5F, 0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11,
-		0x7B, 0x3C, 0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x3C, 0xE3, 0x70, 0xD9, 0x5F, 0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, // AcceptedIDMerkleRoot
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, 0x65, 0x9C, 0x79,
 		0x7B, 0x3C, 0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
@@ -84,11 +81,7 @@ func TestMerkleBlock3(t *testing.T) {
 		0x69, 0xd6, 0xa3, 0xe3, 0x3e, 0x3f, 0xf8, 0x4a,
 		0x5c, 0x41, 0xd9, 0xd3, 0xfe, 0xbe, 0x7c, 0x77,
 		0x0f, 0xdc, 0xc9, 0x6b, 0x2c, 0x3f, 0xf6, 0x0a,
-		0xbe, 0x18, 0x4f, 0x19, 0x63, 0x7f, 0x16, 0xc5,
-		0x96, 0x2e, 0x8b, 0xd9, 0x63, 0x65, 0x9c, 0x79,
-		0x3c, 0xe3, 0x70, 0xd9, 0x5f, 0x09, 0x3b, 0xc7,
-		0xe3, 0x67, 0x11, 0x7b, 0x3c, 0x30, 0xc1, 0xf8,
-		0xfd, 0xd0, 0xd9, 0x72, 0x87, 0x3c, 0xe3, 0x70,
+		0xbe, 0x18, 0x4f, 0x19, 0x63, 0x3c, 0xe3, 0x70,
 		0xd9, 0x5f, 0x09, 0x3b, 0xc7, 0xe3, 0x67, 0x11,
 		0x7f, 0x16, 0xc5, 0x96, 0x2e, 0x8b, 0xd9, 0x63,
 		0x65, 0x9c, 0x79, 0x7b, 0x3c, 0x30, 0xc1, 0xf8,
diff --git a/util/daghash/hash_test.go b/util/daghash/hash_test.go
index 29151d3ff..e69b9a88f 100644
--- a/util/daghash/hash_test.go
+++ b/util/daghash/hash_test.go
@@ -15,10 +15,10 @@ import (
 // mainNetGenesisHash is the hash of the first block in the block chain for the
 // main network (genesis block).
 var mainNetGenesisHash = Hash([HashSize]byte{
-	0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
-	0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-	0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-	0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25,
+	0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+	0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+	0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 })
 
 // TestHash tests the Hash API.
@@ -151,14 +151,14 @@ func TestNewHashFromStr(t *testing.T) {
 	}{
 		// Genesis hash.
 		{
-			"000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
+			"63bbcfdd699ffd8cb19878564b14d3af8ba4d7ee4d1dd54925a7c21d5b5b5fdc",
 			mainNetGenesisHash,
 			nil,
 		},
 
 		// Genesis hash with stripped leading zeros.
 		{
-			"19d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
+			"63bbcfdd699ffd8cb19878564b14d3af8ba4d7ee4d1dd54925a7c21d5b5b5fdc",
 			mainNetGenesisHash,
 			nil,
 		},
diff --git a/wire/bench_test.go b/wire/bench_test.go
index 6098ce8b6..0e49ca142 100644
--- a/wire/bench_test.go
+++ b/wire/bench_test.go
@@ -426,7 +426,7 @@ func BenchmarkDecodeHeaders(b *testing.B) {
 			}
 			parentHashes[i] = hash
 		}
-		m.AddBlockHeader(NewBlockHeader(1, parentHashes, hash, hash, hash, hash, 0, uint64(i)))
+		m.AddBlockHeader(NewBlockHeader(1, parentHashes, hash, hash, hash, 0, uint64(i)))
 	}
 
 	// Serialize it so the bytes are available to test the decode below.
@@ -572,7 +572,7 @@ func BenchmarkDecodeMerkleBlock(b *testing.B) {
 	if err != nil {
 		b.Fatalf("NewHashFromStr: unexpected error: %v", err)
 	}
-	m.Header = *NewBlockHeader(1, []*daghash.Hash{hash}, hash, hash, hash, hash, 0, uint64(10000))
+	m.Header = *NewBlockHeader(1, []*daghash.Hash{hash}, hash, hash, hash, 0, uint64(10000))
 	for i := 0; i < 105; i++ {
 		hash, err := daghash.NewHashFromStr(fmt.Sprintf("%x", i))
 		if err != nil {
diff --git a/wire/blockheader.go b/wire/blockheader.go
index 1a1325a42..7fc78acc5 100644
--- a/wire/blockheader.go
+++ b/wire/blockheader.go
@@ -15,11 +15,11 @@ import (
 // BaseBlockHeaderPayload is the base number of bytes a block header can be,
 // not including the list of parent block headers.
 // Version 4 bytes + Timestamp 8 bytes + Bits 4 bytes + Nonce 8 bytes +
-// + NumParentBlocks 1 byte + HashMerkleRoot hash + IDMerkleRoot hash +
+// + NumParentBlocks 1 byte + HashMerkleRoot hash +
 // + AcceptedIDMerkleRoot hash + UTXOCommitment hash.
 // To get total size of block header len(ParentHashes) * daghash.HashSize should be
 // added to this value
-const BaseBlockHeaderPayload = 25 + 4*(daghash.HashSize)
+const BaseBlockHeaderPayload = 25 + 3*(daghash.HashSize)
 
 // MaxNumParentBlocks is the maximum number of parent blocks a block can reference.
 // Currently set to 255 as the maximum number NumParentBlocks can be due to it being a byte
@@ -41,9 +41,6 @@ type BlockHeader struct {
 	// HashMerkleRoot is the merkle tree reference to hash of all transactions for the block.
 	HashMerkleRoot *daghash.Hash
 
-	// IDMerkleRoot is the merkle tree reference to hash of all transactions' IDs for the block.
-	IDMerkleRoot *daghash.Hash
-
 	// AcceptedIDMerkleRoot is merkle tree reference to hash all transactions
 	// accepted form the block.Blues
 	AcceptedIDMerkleRoot *daghash.Hash
@@ -126,12 +123,10 @@ func (h *BlockHeader) SerializeSize() int {
 }
 
 // NewBlockHeader returns a new BlockHeader using the provided version, previous
-// block hash, hash merkle root, ID merkle root difficulty bits, and nonce used to generate the
+// block hash, hash merkle root, accepted ID merkle root, difficulty bits, and nonce used to generate the
 // block with defaults or calclulated values for the remaining fields.
 func NewBlockHeader(version int32, parentHashes []*daghash.Hash, hashMerkleRoot *daghash.Hash,
-	idMerkleRoot *daghash.Hash, acceptedIDMerkleRoot *daghash.Hash,
-	utxoCommitment *daghash.Hash,
-	bits uint32, nonce uint64) *BlockHeader {
+	acceptedIDMerkleRoot *daghash.Hash, utxoCommitment *daghash.Hash, bits uint32, nonce uint64) *BlockHeader {
 
 	// Limit the timestamp to one second precision since the protocol
 	// doesn't support better.
@@ -139,7 +134,6 @@ func NewBlockHeader(version int32, parentHashes []*daghash.Hash, hashMerkleRoot
 		Version:              version,
 		ParentHashes:         parentHashes,
 		HashMerkleRoot:       hashMerkleRoot,
-		IDMerkleRoot:         idMerkleRoot,
 		AcceptedIDMerkleRoot: acceptedIDMerkleRoot,
 		UTXOCommitment:       utxoCommitment,
 		Timestamp:            time.Unix(time.Now().Unix(), 0),
@@ -168,12 +162,10 @@ func readBlockHeader(r io.Reader, pver uint32, bh *BlockHeader) error {
 		bh.ParentHashes[i] = hash
 	}
 	bh.HashMerkleRoot = &daghash.Hash{}
-	bh.IDMerkleRoot = &daghash.Hash{}
 	bh.AcceptedIDMerkleRoot = &daghash.Hash{}
 	bh.UTXOCommitment = &daghash.Hash{}
-	return readElements(r, bh.HashMerkleRoot, bh.IDMerkleRoot,
-		bh.AcceptedIDMerkleRoot, bh.UTXOCommitment, (*int64Time)(&bh.Timestamp),
-		&bh.Bits, &bh.Nonce)
+	return readElements(r, bh.HashMerkleRoot, bh.AcceptedIDMerkleRoot, bh.UTXOCommitment,
+		(*int64Time)(&bh.Timestamp), &bh.Bits, &bh.Nonce)
 }
 
 // writeBlockHeader writes a bitcoin block header to w.  See Serialize for
@@ -189,6 +181,5 @@ func writeBlockHeader(w io.Writer, pver uint32, bh *BlockHeader) error {
 			return err
 		}
 	}
-	return writeElements(w, bh.HashMerkleRoot, bh.IDMerkleRoot,
-		bh.AcceptedIDMerkleRoot, bh.UTXOCommitment, sec, bh.Bits, bh.Nonce)
+	return writeElements(w, bh.HashMerkleRoot, bh.AcceptedIDMerkleRoot, bh.UTXOCommitment, sec, bh.Bits, bh.Nonce)
 }
diff --git a/wire/blockheader_test.go b/wire/blockheader_test.go
index 632bc7352..65bf9d959 100644
--- a/wire/blockheader_test.go
+++ b/wire/blockheader_test.go
@@ -25,11 +25,9 @@ func TestBlockHeader(t *testing.T) {
 	hashes := []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash}
 
 	merkleHash := mainNetGenesisMerkleRoot
-	idMerkleRoot := exampleIDMerkleRoot
 	acceptedIDMerkleRoot := exampleAcceptedIDMerkleRoot
 	bits := uint32(0x1d00ffff)
-	bh := NewBlockHeader(1, hashes, merkleHash, idMerkleRoot,
-		acceptedIDMerkleRoot, exampleUTXOCommitment, bits, nonce)
+	bh := NewBlockHeader(1, hashes, merkleHash, acceptedIDMerkleRoot, exampleUTXOCommitment, bits, nonce)
 
 	// Ensure we get the same data back out.
 	if !reflect.DeepEqual(bh.ParentHashes, hashes) {
@@ -62,7 +60,6 @@ func TestBlockHeaderWire(t *testing.T) {
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash},
 		HashMerkleRoot:       mainNetGenesisMerkleRoot,
-		IDMerkleRoot:         exampleIDMerkleRoot,
 		AcceptedIDMerkleRoot: exampleAcceptedIDMerkleRoot,
 		UTXOCommitment:       exampleUTXOCommitment,
 		Timestamp:            time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
@@ -74,10 +71,10 @@ func TestBlockHeaderWire(t *testing.T) {
 	baseBlockHdrEncoded := []byte{
 		0x01, 0x00, 0x00, 0x00, // Version 1
 		0x02,                                           // NumParentBlocks
-		0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72, // mainNetGenesisHash
-		0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-		0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-		0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25, // mainNetGenesisHash
+		0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+		0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+		0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 		0xf6, 0x7a, 0xd7, 0x69, 0x5d, 0x9b, 0x66, 0x2a, // simNetGenesisHash
 		0x72, 0xff, 0x3d, 0x8e, 0xdb, 0xbb, 0x2d, 0xe0,
 		0xbf, 0xa6, 0x7b, 0x13, 0x97, 0x4b, 0xb9, 0x91,
@@ -86,10 +83,6 @@ func TestBlockHeaderWire(t *testing.T) {
 		0x32, 0x51, 0x8a, 0x88, 0xc3, 0x1b, 0xc8, 0x7f,
 		0x61, 0x8f, 0x76, 0x67, 0x3e, 0x2c, 0xc7, 0x7a,
 		0xb2, 0x12, 0x7b, 0x7a, 0xfd, 0xed, 0xa3, 0x3b,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-		0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -183,7 +176,6 @@ func TestBlockHeaderSerialize(t *testing.T) {
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash},
 		HashMerkleRoot:       mainNetGenesisMerkleRoot,
-		IDMerkleRoot:         exampleIDMerkleRoot,
 		AcceptedIDMerkleRoot: exampleAcceptedIDMerkleRoot,
 		UTXOCommitment:       exampleUTXOCommitment,
 		Timestamp:            time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
@@ -195,10 +187,10 @@ func TestBlockHeaderSerialize(t *testing.T) {
 	baseBlockHdrEncoded := []byte{
 		0x01, 0x00, 0x00, 0x00, // Version 1
 		0x02,                                           // NumParentBlocks
-		0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72, // mainNetGenesisHash
-		0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-		0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-		0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25, // mainNetGenesisHash
+		0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+		0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+		0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 		0xf6, 0x7a, 0xd7, 0x69, 0x5d, 0x9b, 0x66, 0x2a, // simNetGenesisHash
 		0x72, 0xff, 0x3d, 0x8e, 0xdb, 0xbb, 0x2d, 0xe0,
 		0xbf, 0xa6, 0x7b, 0x13, 0x97, 0x4b, 0xb9, 0x91,
@@ -207,10 +199,6 @@ func TestBlockHeaderSerialize(t *testing.T) {
 		0x32, 0x51, 0x8a, 0x88, 0xc3, 0x1b, 0xc8, 0x7f,
 		0x61, 0x8f, 0x76, 0x67, 0x3e, 0x2c, 0xc7, 0x7a,
 		0xb2, 0x12, 0x7b, 0x7a, 0xfd, 0xed, 0xa3, 0x3b,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-		0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -277,7 +265,6 @@ func TestBlockHeaderSerializeSize(t *testing.T) {
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash},
 		HashMerkleRoot:       mainNetGenesisMerkleRoot,
-		IDMerkleRoot:         mainNetGenesisMerkleRoot,
 		AcceptedIDMerkleRoot: &daghash.ZeroHash,
 		UTXOCommitment:       &daghash.ZeroHash,
 		Timestamp:            timestamp,
@@ -289,7 +276,6 @@ func TestBlockHeaderSerializeSize(t *testing.T) {
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{},
 		HashMerkleRoot:       mainNetGenesisMerkleRoot,
-		IDMerkleRoot:         mainNetGenesisMerkleRoot,
 		AcceptedIDMerkleRoot: &daghash.ZeroHash,
 		UTXOCommitment:       &daghash.ZeroHash,
 		Timestamp:            timestamp,
@@ -301,10 +287,10 @@ func TestBlockHeaderSerializeSize(t *testing.T) {
 		size int          // Expected serialized size
 	}{
 		// Block with no transactions.
-		{genesisBlockHdr, 153},
+		{genesisBlockHdr, 121},
 
 		// First block in the mainnet block DAG.
-		{baseBlockHdr, 217},
+		{baseBlockHdr, 185},
 	}
 
 	t.Logf("Running %d tests", len(tests))
diff --git a/wire/common_test.go b/wire/common_test.go
index b4c9a787b..259d8c342 100644
--- a/wire/common_test.go
+++ b/wire/common_test.go
@@ -18,10 +18,10 @@ import (
 // mainNetGenesisHash is the hash of the first block in the block chain for the
 // main network (genesis block).
 var mainNetGenesisHash = &daghash.Hash{
-	0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
-	0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-	0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-	0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25,
+	0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+	0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+	0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 }
 
 // simNetGenesisHash is the hash of the first block in the block chain for the
@@ -42,13 +42,6 @@ var mainNetGenesisMerkleRoot = &daghash.Hash{
 	0xb2, 0x12, 0x7b, 0x7a, 0xfd, 0xed, 0xa3, 0x3b,
 }
 
-var exampleIDMerkleRoot = &daghash.Hash{
-	0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
-	0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
-}
-
 var exampleAcceptedIDMerkleRoot = &daghash.Hash{
 	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
 	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
diff --git a/wire/message_test.go b/wire/message_test.go
index 9c6b902fe..38924dd29 100644
--- a/wire/message_test.go
+++ b/wire/message_test.go
@@ -68,7 +68,7 @@ func TestMessage(t *testing.T) {
 	msgFilterAdd := NewMsgFilterAdd([]byte{0x01})
 	msgFilterClear := NewMsgFilterClear()
 	msgFilterLoad := NewMsgFilterLoad([]byte{0x01}, 10, 0, BloomUpdateNone)
-	bh := NewBlockHeader(1, []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)
+	bh := NewBlockHeader(1, []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash}, &daghash.Hash{}, &daghash.Hash{}, &daghash.Hash{}, 0, 0)
 	msgMerkleBlock := NewMsgMerkleBlock(bh)
 	msgReject := NewMsgReject("block", RejectDuplicate, "duplicate block")
 	msgGetCFilters := NewMsgGetCFilters(GCSFilterExtended, 0, &daghash.Hash{})
@@ -91,7 +91,7 @@ func TestMessage(t *testing.T) {
 		{msgGetAddr, msgGetAddr, pver, MainNet, 26},
 		{msgAddr, msgAddr, pver, MainNet, 27},
 		{msgGetBlocks, msgGetBlocks, pver, MainNet, 61},
-		{msgBlock, msgBlock, pver, MainNet, 404},
+		{msgBlock, msgBlock, pver, MainNet, 372},
 		{msgInv, msgInv, pver, MainNet, 25},
 		{msgGetData, msgGetData, pver, MainNet, 25},
 		{msgNotFound, msgNotFound, pver, MainNet, 25},
@@ -107,7 +107,7 @@ func TestMessage(t *testing.T) {
 		{msgFilterAdd, msgFilterAdd, pver, MainNet, 26},
 		{msgFilterClear, msgFilterClear, pver, MainNet, 24},
 		{msgFilterLoad, msgFilterLoad, pver, MainNet, 35},
-		{msgMerkleBlock, msgMerkleBlock, pver, MainNet, 247},
+		{msgMerkleBlock, msgMerkleBlock, pver, MainNet, 215},
 		{msgReject, msgReject, pver, MainNet, 79},
 		{msgGetCFilters, msgGetCFilters, pver, MainNet, 65},
 		{msgGetCFHeaders, msgGetCFHeaders, pver, MainNet, 65},
diff --git a/wire/msgblock_test.go b/wire/msgblock_test.go
index 56eb1981c..82b47a339 100644
--- a/wire/msgblock_test.go
+++ b/wire/msgblock_test.go
@@ -25,13 +25,11 @@ func TestBlock(t *testing.T) {
 	// Block 1 header.
 	parentHashes := blockOne.Header.ParentHashes
 	hashMerkleRoot := blockOne.Header.HashMerkleRoot
-	idMerkleRoot := blockOne.Header.IDMerkleRoot
 	acceptedIDMerkleRoot := blockOne.Header.AcceptedIDMerkleRoot
 	utxoCommitment := blockOne.Header.UTXOCommitment
 	bits := blockOne.Header.Bits
 	nonce := blockOne.Header.Nonce
-	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 
 	// Ensure the command is expected value.
 	wantCmd := "block"
@@ -77,7 +75,7 @@ func TestBlock(t *testing.T) {
 // TestBlockHash tests the ability to generate the hash of a block accurately.
 func TestBlockHash(t *testing.T) {
 	// Block 1 hash.
-	hashStr := "8a3a27a37c9e3342b4b38ae9ef29e59fe37b59618adafbf36a106b6d62f80654"
+	hashStr := "22e72b61a572bfb32b8739f4e5db3eebe9870e394288467958e93e4a3d3b749f"
 	wantHash, err := daghash.NewHashFromStr(hashStr)
 	if err != nil {
 		t.Errorf("NewHashFromStr: %v", err)
@@ -221,22 +219,20 @@ func TestBlockWireErrors(t *testing.T) {
 		{&blockOne, blockOneBytes, pver, 37, io.ErrShortWrite, io.EOF},
 		// Force error in hash merkle root.
 		{&blockOne, blockOneBytes, pver, 69, io.ErrShortWrite, io.EOF},
-		// Force error in ID merkle root.
-		{&blockOne, blockOneBytes, pver, 101, io.ErrShortWrite, io.EOF},
 		// Force error in accepted ID merkle root.
-		{&blockOne, blockOneBytes, pver, 133, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 101, io.ErrShortWrite, io.EOF},
 		// Force error in utxo commitment.
-		{&blockOne, blockOneBytes, pver, 165, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 133, io.ErrShortWrite, io.EOF},
 		// Force error in timestamp.
-		{&blockOne, blockOneBytes, pver, 197, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 165, io.ErrShortWrite, io.EOF},
 		// Force error in difficulty bits.
-		{&blockOne, blockOneBytes, pver, 205, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 173, io.ErrShortWrite, io.EOF},
 		// Force error in header nonce.
-		{&blockOne, blockOneBytes, pver, 209, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 177, io.ErrShortWrite, io.EOF},
 		// Force error in transaction count.
-		{&blockOne, blockOneBytes, pver, 217, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 185, io.ErrShortWrite, io.EOF},
 		// Force error in transactions.
-		{&blockOne, blockOneBytes, pver, 218, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, pver, 186, io.ErrShortWrite, io.EOF},
 	}
 
 	t.Logf("Running %d tests", len(tests))
@@ -349,22 +345,20 @@ func TestBlockSerializeErrors(t *testing.T) {
 		{&blockOne, blockOneBytes, 37, io.ErrShortWrite, io.EOF},
 		// Force error in hash merkle root.
 		{&blockOne, blockOneBytes, 69, io.ErrShortWrite, io.EOF},
-		// Force error in ID merkle root.
-		{&blockOne, blockOneBytes, 101, io.ErrShortWrite, io.EOF},
 		// Force error in accepted ID merkle root.
-		{&blockOne, blockOneBytes, 133, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 101, io.ErrShortWrite, io.EOF},
 		// Force error in utxo commitment.
-		{&blockOne, blockOneBytes, 165, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 133, io.ErrShortWrite, io.EOF},
 		// Force error in timestamp.
-		{&blockOne, blockOneBytes, 197, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 165, io.ErrShortWrite, io.EOF},
 		// Force error in difficulty bits.
-		{&blockOne, blockOneBytes, 205, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 173, io.ErrShortWrite, io.EOF},
 		// Force error in header nonce.
-		{&blockOne, blockOneBytes, 209, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 177, io.ErrShortWrite, io.EOF},
 		// Force error in transaction count.
-		{&blockOne, blockOneBytes, 217, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 185, io.ErrShortWrite, io.EOF},
 		// Force error in transactions.
-		{&blockOne, blockOneBytes, 218, io.ErrShortWrite, io.EOF},
+		{&blockOne, blockOneBytes, 186, io.ErrShortWrite, io.EOF},
 	}
 
 	t.Logf("Running %d tests", len(tests))
@@ -428,10 +422,6 @@ func TestBlockOverflowErrors(t *testing.T) {
 				0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76, 0x8f, 0x61,
 				0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32,
 				0x3a, 0x9f, 0xb8, 0xaa, 0x4b, 0x1e, 0x5e, 0x4a,
-				0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-				0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-				0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-				0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 				0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 				0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 				0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -492,7 +482,7 @@ func TestBlockSerializeSize(t *testing.T) {
 		size int       // Expected serialized size
 	}{
 		// Block with no transactions.
-		{noTxBlock, 218},
+		{noTxBlock, 186},
 
 		// First block in the mainnet block chain.
 		{&blockOne, len(blockOneBytes)},
@@ -516,7 +506,6 @@ var blockOne = MsgBlock{
 		Version:              1,
 		ParentHashes:         []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash},
 		HashMerkleRoot:       mainNetGenesisMerkleRoot,
-		IDMerkleRoot:         exampleIDMerkleRoot,
 		AcceptedIDMerkleRoot: exampleAcceptedIDMerkleRoot,
 		UTXOCommitment:       exampleUTXOCommitment,
 		Timestamp:            time.Unix(0x4966bc61, 0), // 2009-01-08 20:54:25 -0600 CST
@@ -562,10 +551,10 @@ var blockOne = MsgBlock{
 var blockOneBytes = []byte{
 	0x01, 0x00, 0x00, 0x00, // Version 1
 	0x02,                                           // NumParentBlocks
-	0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72, // mainNetGenesisHash
-	0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-	0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-	0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25, // mainNetGenesisHash
+	0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+	0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+	0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 	0xf6, 0x7a, 0xd7, 0x69, 0x5d, 0x9b, 0x66, 0x2a, // simNetGenesisHash
 	0x72, 0xff, 0x3d, 0x8e, 0xdb, 0xbb, 0x2d, 0xe0,
 	0xbf, 0xa6, 0x7b, 0x13, 0x97, 0x4b, 0xb9, 0x91,
@@ -574,10 +563,6 @@ var blockOneBytes = []byte{
 	0x32, 0x51, 0x8a, 0x88, 0xc3, 0x1b, 0xc8, 0x7f,
 	0x61, 0x8f, 0x76, 0x67, 0x3e, 0x2c, 0xc7, 0x7a,
 	0xb2, 0x12, 0x7b, 0x7a, 0xfd, 0xed, 0xa3, 0x3b,
-	0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // Fake IDMerkleRoot. TODO: (Ori) Replace to a real IDMerkleRoot
-	0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 	0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -622,5 +607,5 @@ var blockOneBytes = []byte{
 
 // Transaction location information for block one transactions.
 var blockOneTxLocs = []TxLoc{
-	{TxStart: 218, TxLen: 162},
+	{TxStart: 186, TxLen: 162},
 }
diff --git a/wire/msgheaders_test.go b/wire/msgheaders_test.go
index ebe789424..567503cf6 100644
--- a/wire/msgheaders_test.go
+++ b/wire/msgheaders_test.go
@@ -29,7 +29,7 @@ func TestHeaders(t *testing.T) {
 	// Ensure max payload is expected value for latest protocol version.
 	// Num headers (varInt) + max allowed headers (header length + 1 byte
 	// for the number of transactions which is always 0).
-	wantPayload := uint32(16628009)
+	wantPayload := uint32(16564009)
 	maxPayload := msg.MaxPayloadLength(pver)
 	if maxPayload != wantPayload {
 		t.Errorf("MaxPayloadLength: wrong max payload length for "+
@@ -63,13 +63,11 @@ func TestHeaders(t *testing.T) {
 func TestHeadersWire(t *testing.T) {
 	hashes := []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash}
 	hashMerkleRoot := blockOne.Header.HashMerkleRoot
-	idMerkleRoot := blockOne.Header.IDMerkleRoot
 	acceptedIDMerkleRoot := blockOne.Header.AcceptedIDMerkleRoot
 	utxoCommitment := blockOne.Header.UTXOCommitment
 	bits := uint32(0x1d00ffff)
 	nonce := uint64(0x9962e301)
-	bh := NewBlockHeader(1, hashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bh := NewBlockHeader(1, hashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 	bh.Version = blockOne.Header.Version
 	bh.Timestamp = blockOne.Header.Timestamp
 
@@ -86,10 +84,10 @@ func TestHeadersWire(t *testing.T) {
 		0x01,                   // VarInt for number of headers.
 		0x01, 0x00, 0x00, 0x00, // Version 1
 		0x02,                                           // NumParentBlocks
-		0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72, // mainNetGenesisHash
-		0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-		0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-		0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+		0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25, // mainNetGenesisHash
+		0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+		0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+		0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 		0xf6, 0x7a, 0xd7, 0x69, 0x5d, 0x9b, 0x66, 0x2a, // simNetGenesisHash
 		0x72, 0xff, 0x3d, 0x8e, 0xdb, 0xbb, 0x2d, 0xe0,
 		0xbf, 0xa6, 0x7b, 0x13, 0x97, 0x4b, 0xb9, 0x91,
@@ -98,10 +96,6 @@ func TestHeadersWire(t *testing.T) {
 		0x32, 0x51, 0x8a, 0x88, 0xc3, 0x1b, 0xc8, 0x7f,
 		0x61, 0x8f, 0x76, 0x67, 0x3e, 0x2c, 0xc7, 0x7a,
 		0xb2, 0x12, 0x7b, 0x7a, 0xfd, 0xed, 0xa3, 0x3b,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-		0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -178,13 +172,11 @@ func TestHeadersWireErrors(t *testing.T) {
 
 	hashes := []*daghash.Hash{mainNetGenesisHash, simNetGenesisHash}
 	hashMerkleRoot := blockOne.Header.HashMerkleRoot
-	idMerkleRoot := blockOne.Header.IDMerkleRoot
 	acceptedIDMerkleRoot := blockOne.Header.AcceptedIDMerkleRoot
 	utxoCommitment := blockOne.Header.UTXOCommitment
 	bits := uint32(0x1d00ffff)
 	nonce := uint64(0x9962e301)
-	bh := NewBlockHeader(1, hashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bh := NewBlockHeader(1, hashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 	bh.Version = blockOne.Header.Version
 	bh.Timestamp = blockOne.Header.Timestamp
 
@@ -207,10 +199,6 @@ func TestHeadersWireErrors(t *testing.T) {
 		0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76, 0x8f, 0x61,
 		0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32,
 		0x3a, 0x9f, 0xb8, 0xaa, 0x4b, 0x1e, 0x5e, 0x4a,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-		0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -238,8 +226,7 @@ func TestHeadersWireErrors(t *testing.T) {
 
 	// Intentionally invalid block header that has a transaction count used
 	// to force errors.
-	bhTrans := NewBlockHeader(1, hashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bhTrans := NewBlockHeader(1, hashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 	bhTrans.Version = blockOne.Header.Version
 	bhTrans.Timestamp = blockOne.Header.Timestamp
 
@@ -261,10 +248,6 @@ func TestHeadersWireErrors(t *testing.T) {
 		0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76, 0x8f, 0x61,
 		0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32,
 		0x3a, 0x9f, 0xb8, 0xaa, 0x4b, 0x1e, 0x5e, 0x4a,
-		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-		0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 		0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 		0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
@@ -295,7 +278,7 @@ func TestHeadersWireErrors(t *testing.T) {
 		// Force error with greater than max headers.
 		{maxHeaders, maxHeadersEncoded, pver, 3, wireErr, wireErr},
 		// Force error with number of transactions.
-		{transHeader, transHeaderEncoded, pver, 210, io.ErrShortWrite, io.EOF},
+		{transHeader, transHeaderEncoded, pver, 178, io.ErrShortWrite, io.EOF},
 		// Force error with included transactions.
 		{transHeader, transHeaderEncoded, pver, len(transHeaderEncoded), nil, wireErr},
 	}
diff --git a/wire/msgmerkleblock_test.go b/wire/msgmerkleblock_test.go
index 0dd67218d..30d4c45d5 100644
--- a/wire/msgmerkleblock_test.go
+++ b/wire/msgmerkleblock_test.go
@@ -23,13 +23,11 @@ func TestMerkleBlock(t *testing.T) {
 	// Block 1 header.
 	parentHashes := blockOne.Header.ParentHashes
 	hashMerkleRoot := blockOne.Header.HashMerkleRoot
-	idMerkleRoot := blockOne.Header.IDMerkleRoot
 	acceptedIDMerkleRoot := blockOne.Header.AcceptedIDMerkleRoot
 	utxoCommitment := blockOne.Header.UTXOCommitment
 	bits := blockOne.Header.Bits
 	nonce := blockOne.Header.Nonce
-	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 
 	// Ensure the command is expected value.
 	wantCmd := "merkleblock"
@@ -119,13 +117,11 @@ func TestMerkleBlockCrossProtocol(t *testing.T) {
 	// Block 1 header.
 	parentHashes := blockOne.Header.ParentHashes
 	hashMerkleRoot := blockOne.Header.HashMerkleRoot
-	idMerkleRoot := blockOne.Header.IDMerkleRoot
 	acceptedIDMerkleRoot := blockOne.Header.AcceptedIDMerkleRoot
 	utxoCommitment := blockOne.Header.UTXOCommitment
 	bits := blockOne.Header.Bits
 	nonce := blockOne.Header.Nonce
-	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, idMerkleRoot,
-		acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
+	bh := NewBlockHeader(1, parentHashes, hashMerkleRoot, acceptedIDMerkleRoot, utxoCommitment, bits, nonce)
 
 	msg := NewMsgMerkleBlock(bh)
 
@@ -207,28 +203,26 @@ func TestMerkleBlockWireErrors(t *testing.T) {
 		{&merkleBlockOne, merkleBlockOneBytes, pver, 37, io.ErrShortWrite, io.EOF},
 		// Force error in hash merkle root.
 		{&merkleBlockOne, merkleBlockOneBytes, pver, 69, io.ErrShortWrite, io.EOF},
-		// Force error in hash merkle root.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 101, io.ErrShortWrite, io.EOF},
 		// Force error in accepted ID merkle root.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 133, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 101, io.ErrShortWrite, io.EOF},
 		// Force error in utxo commitment.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 165, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 133, io.ErrShortWrite, io.EOF},
 		// Force error in timestamp.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 197, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 165, io.ErrShortWrite, io.EOF},
 		// Force error in difficulty bits.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 205, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 173, io.ErrShortWrite, io.EOF},
 		// Force error in header nonce.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 209, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 177, io.ErrShortWrite, io.EOF},
 		// Force error in transaction count.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 217, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 185, io.ErrShortWrite, io.EOF},
 		// Force error in num hashes.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 221, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 189, io.ErrShortWrite, io.EOF},
 		// Force error in hashes.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 222, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 190, io.ErrShortWrite, io.EOF},
 		// Force error in num flag bytes.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 254, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 222, io.ErrShortWrite, io.EOF},
 		// Force error in flag bytes.
-		{&merkleBlockOne, merkleBlockOneBytes, pver, 255, io.ErrShortWrite, io.EOF},
+		{&merkleBlockOne, merkleBlockOneBytes, pver, 223, io.ErrShortWrite, io.EOF},
 	}
 
 	t.Logf("Running %d tests", len(tests))
@@ -285,7 +279,7 @@ func TestMerkleBlockOverflowErrors(t *testing.T) {
 	// allowed tx hashes.
 	var buf bytes.Buffer
 	WriteVarInt(&buf, maxTxPerBlock+1)
-	numHashesOffset := 221
+	numHashesOffset := 189
 	exceedMaxHashes := make([]byte, numHashesOffset)
 	copy(exceedMaxHashes, merkleBlockOneBytes[:numHashesOffset])
 	spew.Dump(exceedMaxHashes)
@@ -295,7 +289,7 @@ func TestMerkleBlockOverflowErrors(t *testing.T) {
 	// allowed flag bytes.
 	buf.Reset()
 	WriteVarInt(&buf, maxFlagsPerMerkleBlock+1)
-	numFlagBytesOffset := 254
+	numFlagBytesOffset := 222
 	exceedMaxFlagBytes := make([]byte, numFlagBytesOffset)
 	copy(exceedMaxFlagBytes, merkleBlockOneBytes[:numFlagBytesOffset])
 	exceedMaxFlagBytes = append(exceedMaxFlagBytes, buf.Bytes()...)
@@ -337,7 +331,6 @@ var merkleBlockOne = MsgMerkleBlock{
 			0x7b, 0xa1, 0xa3, 0xc3, 0x54, 0x0b, 0xf7, 0xb1,
 			0xcd, 0xb6, 0x06, 0xe8, 0x57, 0x23, 0x3e, 0x0e,
 		},
-		IDMerkleRoot:         exampleIDMerkleRoot,
 		AcceptedIDMerkleRoot: exampleAcceptedIDMerkleRoot,
 		UTXOCommitment:       exampleUTXOCommitment,
 		Timestamp:            time.Unix(0x4966bc61, 0), // 2009-01-08 20:54:25 -0600 CST
@@ -361,10 +354,10 @@ var merkleBlockOne = MsgMerkleBlock{
 var merkleBlockOneBytes = []byte{
 	0x01, 0x00, 0x00, 0x00, // Version 1
 	0x02,                                           // NumParentBlocks
-	0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72, // mainNetGenesisHash
-	0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-	0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-	0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25, // mainNetGenesisHash
+	0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+	0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+	0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63,
 	0xf6, 0x7a, 0xd7, 0x69, 0x5d, 0x9b, 0x66, 0x2a, // simNetGenesisHash
 	0x72, 0xff, 0x3d, 0x8e, 0xdb, 0xbb, 0x2d, 0xe0,
 	0xbf, 0xa6, 0x7b, 0x13, 0x97, 0x4b, 0xb9, 0x91,
@@ -373,10 +366,6 @@ var merkleBlockOneBytes = []byte{
 	0xbb, 0xbe, 0x68, 0x0e, 0x1f, 0xee, 0x14, 0x67,
 	0x7b, 0xa1, 0xa3, 0xc3, 0x54, 0x0b, 0xf7, 0xb1,
 	0xcd, 0xb6, 0x06, 0xe8, 0x57, 0x23, 0x3e, 0x0e,
-	0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63, // IDMerkleRoot
-	0x65, 0x9C, 0x79, 0x3C, 0xE3, 0x70, 0xD9, 0x5F,
-	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C,
-	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 	0x09, 0x3B, 0xC7, 0xE3, 0x67, 0x11, 0x7B, 0x3C, // AcceptedIDMerkleRoot
 	0x30, 0xC1, 0xF8, 0xFD, 0xD0, 0xD9, 0x72, 0x87,
 	0x7F, 0x16, 0xC5, 0x96, 0x2E, 0x8B, 0xD9, 0x63,
diff --git a/wire/msgreject_test.go b/wire/msgreject_test.go
index c79ae115d..626e71514 100644
--- a/wire/msgreject_test.go
+++ b/wire/msgreject_test.go
@@ -174,10 +174,10 @@ func TestRejectWire(t *testing.T) {
 				0x12, // RejectDuplicate
 				0x0f, 0x64, 0x75, 0x70, 0x6c, 0x69, 0x63, 0x61,
 				0x74, 0x65, 0x20, 0x62, 0x6c, 0x6f, 0x63, 0x6b, // "duplicate block"
-				0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
-				0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
-				0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
-				0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, // mainNetGenesisHash
+				0xdc, 0x5f, 0x5b, 0x5b, 0x1d, 0xc2, 0xa7, 0x25,
+				0x49, 0xd5, 0x1d, 0x4d, 0xee, 0xd7, 0xa4, 0x8b,
+				0xaf, 0xd3, 0x14, 0x4b, 0x56, 0x78, 0x98, 0xb1,
+				0x8c, 0xfd, 0x9f, 0x69, 0xdd, 0xcf, 0xbb, 0x63, // mainNetGenesisHash
 			},
 			ProtocolVersion,
 		},