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diff --git a/src/core/block.h b/src/core/block.h
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+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2013 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef H_BITCOIN_CORE_BLOCK
+#define H_BITCOIN_CORE_BLOCK
+
+#include "core/transaction.h"
+#include "serialize.h"
+#include "uint256.h"
+
+/** Nodes collect new transactions into a block, hash them into a hash tree,
+ * and scan through nonce values to make the block's hash satisfy proof-of-work
+ * requirements. When they solve the proof-of-work, they broadcast the block
+ * to everyone and the block is added to the block chain. The first transaction
+ * in the block is a special one that creates a new coin owned by the creator
+ * of the block.
+ */
+class CBlockHeader
+{
+public:
+ // header
+ static const int32_t CURRENT_VERSION=2;
+ int32_t nVersion;
+ uint256 hashPrevBlock;
+ uint256 hashMerkleRoot;
+ uint32_t nTime;
+ uint32_t nBits;
+ uint32_t nNonce;
+
+ CBlockHeader()
+ {
+ SetNull();
+ }
+
+ ADD_SERIALIZE_METHODS;
+
+ template <typename Stream, typename Operation>
+ inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+ READWRITE(this->nVersion);
+ nVersion = this->nVersion;
+ READWRITE(hashPrevBlock);
+ READWRITE(hashMerkleRoot);
+ READWRITE(nTime);
+ READWRITE(nBits);
+ READWRITE(nNonce);
+ }
+
+ void SetNull()
+ {
+ nVersion = CBlockHeader::CURRENT_VERSION;
+ hashPrevBlock = 0;
+ hashMerkleRoot = 0;
+ nTime = 0;
+ nBits = 0;
+ nNonce = 0;
+ }
+
+ bool IsNull() const
+ {
+ return (nBits == 0);
+ }
+
+ uint256 GetHash() const;
+
+ int64_t GetBlockTime() const
+ {
+ return (int64_t)nTime;
+ }
+};
+
+
+class CBlock : public CBlockHeader
+{
+public:
+ // network and disk
+ std::vector<CTransaction> vtx;
+
+ // memory only
+ mutable std::vector<uint256> vMerkleTree;
+
+ CBlock()
+ {
+ SetNull();
+ }
+
+ CBlock(const CBlockHeader &header)
+ {
+ SetNull();
+ *((CBlockHeader*)this) = header;
+ }
+
+ ADD_SERIALIZE_METHODS;
+
+ template <typename Stream, typename Operation>
+ inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+ READWRITE(*(CBlockHeader*)this);
+ READWRITE(vtx);
+ }
+
+ void SetNull()
+ {
+ CBlockHeader::SetNull();
+ vtx.clear();
+ vMerkleTree.clear();
+ }
+
+ CBlockHeader GetBlockHeader() const
+ {
+ CBlockHeader block;
+ block.nVersion = nVersion;
+ block.hashPrevBlock = hashPrevBlock;
+ block.hashMerkleRoot = hashMerkleRoot;
+ block.nTime = nTime;
+ block.nBits = nBits;
+ block.nNonce = nNonce;
+ return block;
+ }
+
+ // Build the in-memory merkle tree for this block and return the merkle root.
+ // If non-NULL, *mutated is set to whether mutation was detected in the merkle
+ // tree (a duplication of transactions in the block leading to an identical
+ // merkle root).
+ uint256 BuildMerkleTree(bool* mutated = NULL) const;
+
+ std::vector<uint256> GetMerkleBranch(int nIndex) const;
+ static uint256 CheckMerkleBranch(uint256 hash, const std::vector<uint256>& vMerkleBranch, int nIndex);
+ std::string ToString() const;
+};
+
+
+/** Describes a place in the block chain to another node such that if the
+ * other node doesn't have the same branch, it can find a recent common trunk.
+ * The further back it is, the further before the fork it may be.
+ */
+struct CBlockLocator
+{
+ std::vector<uint256> vHave;
+
+ CBlockLocator() {}
+
+ CBlockLocator(const std::vector<uint256>& vHaveIn)
+ {
+ vHave = vHaveIn;
+ }
+
+ ADD_SERIALIZE_METHODS;
+
+ template <typename Stream, typename Operation>
+ inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+ if (!(nType & SER_GETHASH))
+ READWRITE(nVersion);
+ READWRITE(vHave);
+ }
+
+ void SetNull()
+ {
+ vHave.clear();
+ }
+
+ bool IsNull()
+ {
+ return vHave.empty();
+ }
+};
+
+#endif // H_BITCOIN_CORE_BLOCK