bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bool fCheckMerkleRoot)
{
    // These are checks that are independent of context
    // that can be verified before saving an orphan block.
/*
    // Size limits
    if (block.vtx.empty() || block.vtx.size() > MAX_BLOCK_SIZE || ::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION) > MAX_BLOCK_SIZE)
        return state.DoS(100, error("CheckBlock() : size limits failed"),
                         REJECT_INVALID, "bad-blk-length");


    // Check proof of work matches claimed amount
    if (fCheckPOW && !CheckProofOfWork(block.GetHash(), block.nBits))
        return state.DoS(50, error("CheckBlock() : proof of work failed"),
                         REJECT_INVALID, "high-hash");
*/

    // Check timestamp
    if (block.GetBlockTime() > GetAdjustedTime() + 2 * 60 * 60)
        return state.Invalid(error("CheckBlock() : block timestamp too far in the future"),
                             REJECT_INVALID, "time-too-new");
/*
    // First transaction must be coinbase, the rest must not be
    if (block.vtx.empty() || !block.vtx[0].IsCoinBase())
        return state.DoS(100, error("CheckBlock() : first tx is not coinbase"),
                         REJECT_INVALID, "bad-cb-missing");
    for (unsigned int i = 1; i < block.vtx.size(); i++)
        if (block.vtx[i].IsCoinBase())
            return state.DoS(100, error("CheckBlock() : more than one coinbase"),
                             REJECT_INVALID, "bad-cb-multiple");
*/

/*
    // Check transactions
    BOOST_FOREACH(const CTransaction& tx, block.vtx)
        if (!CheckTransaction(tx, state))
            return error("CheckBlock() : CheckTransaction failed");
*/

    // Build the merkle tree already. We need it anyway later, and it makes the
    // block cache the transaction hashes, which means they don't need to be
    // recalculated many times during this block's validation.
    block.BuildMerkleTree();

    // Check for duplicate txids. This is caught by ConnectInputs(),
    // but catching it earlier avoids a potential DoS attack:
    set uniqueTx;
    for (unsigned int i = 0; i < block.vtx.size(); i++) {
        uniqueTx.insert(block.GetTxHash(i));
    }
    if (uniqueTx.size() != block.vtx.size())
        return state.DoS(100, error("CheckBlock() : duplicate transaction"),
                         REJECT_INVALID, "bad-txns-duplicate", true);

/*
    unsigned int nSigOps = 0;
    BOOST_FOREACH(const CTransaction& tx, block.vtx)
    {
        nSigOps += GetLegacySigOpCount(tx);
    }
    if (nSigOps > MAX_BLOCK_SIGOPS)
        return state.DoS(100, error("CheckBlock() : out-of-bounds SigOpCount"),
                         REJECT_INVALID, "bad-blk-sigops", true);


    // Check merkle root
    if (fCheckMerkleRoot && block.hashMerkleRoot != block.vMerkleTree.back())
        return state.DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"),
                         REJECT_INVALID, "bad-txnmrklroot", true);
*/

    return true;
}