Function CheckFinalTxAtTip

src/validation.cpp:155–175

                       EXCLUSIVE_LOCKS_REQUIRED(cs_main);

bool CheckFinalTxAtTip(const CBlockIndex& active_chain_tip, const CTransaction& tx)
{
    AssertLockHeld(cs_main);

    // CheckFinalTxAtTip() uses active_chain_tip.Height()+1 to evaluate
    // nLockTime because when IsFinalTx() is called within
    // AcceptBlock(), the height of the block *being*
    // evaluated is what is used. Thus if we want to know if a
    // transaction can be part of the *next* block, we need to call
    // IsFinalTx() with one more than active_chain_tip.Height().
    const int nBlockHeight = active_chain_tip.nHeight + 1;

    // BIP113 requires that time-locked transactions have nLockTime set to
    // less than the median time of the previous block they're contained in.
    // When the next block is created its previous block will be the current
    // chain tip, so we use that to calculate the median time passed to
    // IsFinalTx().
    const int64_t nBlockTime{active_chain_tip.GetMedianTimePast()};

    return IsFinalTx(tx, nBlockHeight, nBlockTime);
}

namespace {
/**