diff --git a/blockchain/blockindex.go b/blockchain/blockindex.go
index 2ff2fa27..1531e6b1 100644
--- a/blockchain/blockindex.go
+++ b/blockchain/blockindex.go
@@ -93,6 +93,7 @@ type blockNode struct {
 	nonce      uint32
 	timestamp  int64
 	merkleRoot chainhash.Hash
+	claimTrie  chainhash.Hash
 
 	// status is a bitfield representing the validation state of the block. The
 	// status field, unlike the other fields, may be written to and so should
@@ -114,6 +115,7 @@ func initBlockNode(node *blockNode, blockHeader *wire.BlockHeader, parent *block
 		nonce:      blockHeader.Nonce,
 		timestamp:  blockHeader.Timestamp.Unix(),
 		merkleRoot: blockHeader.MerkleRoot,
+		claimTrie:  blockHeader.ClaimTrie,
 	}
 	if parent != nil {
 		node.parent = parent
@@ -144,6 +146,7 @@ func (node *blockNode) Header() wire.BlockHeader {
 		Version:    node.version,
 		PrevBlock:  *prevHash,
 		MerkleRoot: node.merkleRoot,
+		ClaimTrie:  node.claimTrie,
 		Timestamp:  time.Unix(node.timestamp, 0),
 		Bits:       node.bits,
 		Nonce:      node.nonce,
diff --git a/blockchain/error.go b/blockchain/error.go
index 1e7c879b..f18648f3 100644
--- a/blockchain/error.go
+++ b/blockchain/error.go
@@ -220,6 +220,10 @@ const (
 	// current chain tip. This is not a block validation rule, but is required
 	// for block proposals submitted via getblocktemplate RPC.
 	ErrPrevBlockNotBest
+
+	// ErrBadClaimTrie indicates the calculated ClaimTrie root does not match
+	// the expected value.
+	ErrBadClaimTrie
 )
 
 // Map of ErrorCode values back to their constant names for pretty printing.
@@ -267,6 +271,7 @@ var errorCodeStrings = map[ErrorCode]string{
 	ErrPreviousBlockUnknown:      "ErrPreviousBlockUnknown",
 	ErrInvalidAncestorBlock:      "ErrInvalidAncestorBlock",
 	ErrPrevBlockNotBest:          "ErrPrevBlockNotBest",
+	ErrBadClaimTrie:              "ErrBadClaimTrie",
 }
 
 // String returns the ErrorCode as a human-readable name.
diff --git a/btcjson/chainsvrresults.go b/btcjson/chainsvrresults.go
index 59f18c74..405fd867 100644
--- a/btcjson/chainsvrresults.go
+++ b/btcjson/chainsvrresults.go
@@ -25,6 +25,7 @@ type GetBlockHeaderVerboseResult struct {
 	Version       int32   `json:"version"`
 	VersionHex    string  `json:"versionHex"`
 	MerkleRoot    string  `json:"merkleroot"`
+	ClaimTrie     string  `json:"claimtrie"`
 	Time          int64   `json:"time"`
 	Nonce         uint64  `json:"nonce"`
 	Bits          string  `json:"bits"`
@@ -81,6 +82,7 @@ type GetBlockVerboseResult struct {
 	Version       int32         `json:"version"`
 	VersionHex    string        `json:"versionHex"`
 	MerkleRoot    string        `json:"merkleroot"`
+	ClaimTrie     string        `json:"claimTrie"`
 	Tx            []string      `json:"tx,omitempty"`
 	RawTx         []TxRawResult `json:"rawtx,omitempty"` // Note: this field is always empty when verbose != 2.
 	Time          int64         `json:"time"`
diff --git a/wire/blockheader.go b/wire/blockheader.go
index 9c9c2237..b4d0531e 100644
--- a/wire/blockheader.go
+++ b/wire/blockheader.go
@@ -15,7 +15,7 @@ import (
 // MaxBlockHeaderPayload is the maximum number of bytes a block header can be.
 // Version 4 bytes + Timestamp 4 bytes + Bits 4 bytes + Nonce 4 bytes +
 // PrevBlock and MerkleRoot hashes.
-const MaxBlockHeaderPayload = 16 + (chainhash.HashSize * 2)
+const MaxBlockHeaderPayload = 16 + (chainhash.HashSize * 3)
 
 // BlockHeader defines information about a block and is used in the bitcoin
 // block (MsgBlock) and headers (MsgHeaders) messages.
@@ -29,6 +29,9 @@ type BlockHeader struct {
 	// Merkle tree reference to hash of all transactions for the block.
 	MerkleRoot chainhash.Hash
 
+	// ClaimTrie reference to hash of ClaimTrie.
+	ClaimTrie chainhash.Hash
+
 	// Time the block was created.  This is, unfortunately, encoded as a
 	// uint32 on the wire and therefore is limited to 2106.
 	Timestamp time.Time
@@ -96,7 +99,7 @@ func (h *BlockHeader) Serialize(w io.Writer) error {
 // block hash, merkle root hash, difficulty bits, and nonce used to generate the
 // block with defaults for the remaining fields.
 func NewBlockHeader(version int32, prevHash, merkleRootHash *chainhash.Hash,
-	bits uint32, nonce uint32) *BlockHeader {
+	claimTrieHash *chainhash.Hash, bits uint32, nonce uint32) *BlockHeader {
 
 	// Limit the timestamp to one second precision since the protocol
 	// doesn't support better.
@@ -104,6 +107,7 @@ func NewBlockHeader(version int32, prevHash, merkleRootHash *chainhash.Hash,
 		Version:    version,
 		PrevBlock:  *prevHash,
 		MerkleRoot: *merkleRootHash,
+		ClaimTrie:  *claimTrieHash,
 		Timestamp:  time.Unix(time.Now().Unix(), 0),
 		Bits:       bits,
 		Nonce:      nonce,
@@ -115,7 +119,7 @@ func NewBlockHeader(version int32, prevHash, merkleRootHash *chainhash.Hash,
 // decoding from the wire.
 func readBlockHeader(r io.Reader, pver uint32, bh *BlockHeader) error {
 	return readElements(r, &bh.Version, &bh.PrevBlock, &bh.MerkleRoot,
-		(*uint32Time)(&bh.Timestamp), &bh.Bits, &bh.Nonce)
+		&bh.ClaimTrie, (*uint32Time)(&bh.Timestamp), &bh.Bits, &bh.Nonce)
 }
 
 // writeBlockHeader writes a bitcoin block header to w.  See Serialize for
@@ -124,5 +128,5 @@ func readBlockHeader(r io.Reader, pver uint32, bh *BlockHeader) error {
 func writeBlockHeader(w io.Writer, pver uint32, bh *BlockHeader) error {
 	sec := uint32(bh.Timestamp.Unix())
 	return writeElements(w, bh.Version, &bh.PrevBlock, &bh.MerkleRoot,
-		sec, bh.Bits, bh.Nonce)
+		&bh.ClaimTrie, sec, bh.Bits, bh.Nonce)
 }