Method GetKeyBirthTimes

src/wallet/wallet.cpp:3787–3836

/** @} */ // end of Actions

void CWallet::GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const {
    AssertLockHeld(cs_wallet); // mapKeyMetadata
    mapKeyBirth.clear();

    // get birth times for keys with metadata
    for (const auto& entry : mapKeyMetadata) {
        if (entry.second.nCreateTime) {
            mapKeyBirth[entry.first] = entry.second.nCreateTime;
        }
    }

    // map in which we'll infer heights of other keys
    CBlockIndex *pindexMax = chainActive[std::max(0, chainActive.Height() - 144)]; // the tip can be reorganized; use a 144-block safety margin
    std::map<CKeyID, CBlockIndex*> mapKeyFirstBlock;
    for (const CKeyID &keyid : GetKeys()) {
        if (mapKeyBirth.count(keyid) == 0)
            mapKeyFirstBlock[keyid] = pindexMax;
    }

    // if there are no such keys, we're done
    if (mapKeyFirstBlock.empty())
        return;

    // find first block that affects those keys, if there are any left
    std::vector<CKeyID> vAffected;
    for (const auto& entry : mapWallet) {
        // iterate over all wallet transactions...
        const CWalletTx &wtx = entry.second;
        CBlockIndex* pindex = LookupBlockIndex(wtx.hashBlock);
        if (pindex && chainActive.Contains(pindex)) {
            // ... which are already in a block
            int nHeight = pindex->nHeight;
            for (const CTxOut &txout : wtx.tx->vout) {
                // iterate over all their outputs
                CAffectedKeysVisitor(*this, vAffected).Process(txout.scriptPubKey);
                for (const CKeyID &keyid : vAffected) {
                    // ... and all their affected keys
                    std::map<CKeyID, CBlockIndex*>::iterator rit = mapKeyFirstBlock.find(keyid);
                    if (rit != mapKeyFirstBlock.end() && nHeight < rit->second->nHeight)
                        rit->second = pindex;
                }
                vAffected.clear();
            }
        }
    }

    // Extract block timestamps for those keys
    for (const auto& entry : mapKeyFirstBlock)
        mapKeyBirth[entry.first] = entry.second->GetBlockTime() - TIMESTAMP_WINDOW; // block times can be 2h off
}

/**
 * Compute smart timestamp for a transaction being added to the wallet.