Method GetKeyBirthTimes

src/wallet/wallet.cpp:2696–2754

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

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

    // map in which we'll infer heights of other keys
    std::map<CKeyID, const TxStateConfirmed*> mapKeyFirstBlock;
    TxStateConfirmed max_confirm{uint256{}, /*height=*/-1, /*index=*/-1};
    max_confirm.confirmed_block_height = GetLastBlockHeight() > 144 ? GetLastBlockHeight() - 144 : 0; // the tip can be reorganized; use a 144-block safety margin
    CHECK_NONFATAL(chain().findAncestorByHeight(GetLastBlockHash(), max_confirm.confirmed_block_height, FoundBlock().hash(max_confirm.confirmed_block_hash)));

    {
        LegacyScriptPubKeyMan* spk_man = GetLegacyScriptPubKeyMan();
        assert(spk_man != nullptr);
        LOCK(spk_man->cs_KeyStore);

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

        // Prepare to infer birth heights for keys without metadata
        for (const CKeyID &keyid : spk_man->GetKeys()) {
            if (mapKeyBirth.count(keyid) == 0)
                mapKeyFirstBlock[keyid] = &max_confirm;
        }

        // 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
        for (const auto& entry : mapWallet) {
            // iterate over all wallet transactions...
            const CWalletTx &wtx = entry.second;
            if (auto* conf = wtx.state<TxStateConfirmed>()) {
                // ... which are already in a block
                for (const CTxOut &txout : wtx.tx->vout) {
                    // iterate over all their outputs
                    for (const auto &keyid : GetAffectedKeys(txout.scriptPubKey, *spk_man)) {
                        // ... and all their affected keys
                        auto rit = mapKeyFirstBlock.find(keyid);
                        if (rit != mapKeyFirstBlock.end() && conf->confirmed_block_height < rit->second->confirmed_block_height) {
                            rit->second = conf;
                        }
                    }
                }
            }
        }
    }

    // Extract block timestamps for those keys
    for (const auto& entry : mapKeyFirstBlock) {
        int64_t block_time;
        CHECK_NONFATAL(chain().findBlock(entry.second->confirmed_block_hash, FoundBlock().time(block_time)));
        mapKeyBirth[entry.first] = block_time - TIMESTAMP_WINDOW; // block times can be 2h off
    }