  "mempoolminfee": 0.00000000

When the minrelaytxfee is > 0.

CUpdatedBlock block;
    {
        std::unique_lock<std::mutex> lock(cs_blockchange);
        if(timeout)
            cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&height]{return latestblock.height >= height || !IsRPCRunning();});
        else
            cond_blockchange.wait(lock, [&height]{return latestblock.height >= height || !IsRPCRunning(); });
        block = latestblock;
    }
    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("hash", block.hash.GetHex()));
    ret.push_back(Pair("height", block.height));
    return ret;
}
UniValue getdifficulty(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getdifficulty\n"
            "\nReturns the proof-of-work difficulty as a multiple of the minimum difficulty.\n"
            "\nResult:\n"
            "n.nnn       (numeric) the proof-of-work difficulty as a multiple of the minimum difficulty.\n"
            "\nExamples:\n"
            + HelpExampleCli("getdifficulty", "")
            + HelpExampleRpc("getdifficulty", "")
        );
    LOCK(cs_main);
    return GetDifficulty();
}
std::string EntryDescriptionString()