monacoin signet params

/**
 * Signet
 */
class SigNetParams : public CChainParams {
public:
    explicit SigNetParams(const ArgsManager& args) {
        std::vector<uint8_t> bin;
        vSeeds.clear();

        if (!args.IsArgSet("-signetchallenge")) {
            bin = ParseHex("512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be430210359ef5021964fe22d6f8e05b2463c9540ce96883fe3b278760f048f5189f2e6c452ae"); #TODO
            vSeeds.emplace_back("???.???.???.???"); #TODO

            consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000000000019fd16269a");
            consensus.defaultAssumeValid = uint256S("0x0000002a1de0f46379358c1fd09906f7ac59adf3712323ed90eb59e4c183c020"); // 9434
            m_assumed_blockchain_size = 1;
            m_assumed_chain_state_size = 0;
            chainTxData = ChainTxData{
                // Data from RPC: getchaintxstats 4096 0000002a1de0f46379358c1fd09906f7ac59adf3712323ed90eb59e4c183c020
                /* nTime    */ 1603986000,
                /* nTxCount */ 9582,
                /* dTxRate  */ 0.00159272030651341,
            };
        } else {
            const auto signet_challenge = args.GetArgs("-signetchallenge");
            if (signet_challenge.size() != 1) {
                throw std::runtime_error(strprintf("%s: -signetchallenge cannot be multiple values.", __func__));
            }
            bin = ParseHex(signet_challenge[0]);

            consensus.nMinimumChainWork = uint256{};
            consensus.defaultAssumeValid = uint256{};
            m_assumed_blockchain_size = 0;
            m_assumed_chain_state_size = 0;
            chainTxData = ChainTxData{
                0,
                0,
                0,
            };
            LogPrintf("Signet with challenge %s\n", signet_challenge[0]);
        }

        if (args.IsArgSet("-signetseednode")) {
            vSeeds = args.GetArgs("-signetseednode");
        }

        strNetworkID = CBaseChainParams::SIGNET;
        consensus.signet_blocks = true;
        consensus.signet_challenge.assign(bin.begin(), bin.end());
        consensus.nSubsidyHalvingInterval = 210000;
        consensus.BIP16Exception = uint256{};
        consensus.BIP34Height = 1;
        consensus.BIP34Hash = uint256{};
        consensus.BIP65Height = 1;
        consensus.BIP66Height = 1;
        consensus.CSVHeight = 1;
        consensus.SegwitHeight = 1;
        consensus.nPowTargetTimespan = 1.1 * 24 * 60 * 60; // 1.1 days
        consensus.nPowTargetSpacing = 1.5 * 60; // 1.5 minutes
        consensus.fPowAllowMinDifficultyBlocks = false;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 75; // 75% for testchains
        consensus.nMinerConfirmationWindow = 100; // nPowTargetTimespan / nPowTargetSpacing
        consensus.MinBIP9WarningHeight = 0;
        consensus.powLimit = uint256S("00000377ae000000000000000000000000000000000000000000000000000000");
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = Consensus::BIP9Deployment::NEVER_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].min_activation_height = 0; // No activation delay

        // Activation of Taproot (BIPs 340-342)
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].bit = 2;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
        consensus.vDeployments[Consensus::DEPLOYMENT_TAPROOT].min_activation_height = 0; // No activation delay

        // message start is defined as the first 4 bytes of the sha256d of the block script
        CHashWriter h(SER_DISK, 0);
        h << consensus.signet_challenge;
        uint256 hash = h.GetHash();
        memcpy(pchMessageStart, hash.begin(), 4);

        // Hardfork params
        nSwitchKGWblock = 10;
        nSwitchDIGIblock = 20;
        nSwitchLyra2REv2_DGW = 30;

        nDefaultPort = 39403;
        nPruneAfterHeight = 1000;

        genesis = CreateGenesisBlock(1598918400, 52613770, 0x1e0377ae, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x00000008819873e925422c1ff0f99f7cc9bbb232af63a077a480a3633bee1ef6")); #TODO
        assert(genesis.hashMerkleRoot == uint256S("0x4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b")); #TODO

        vFixedSeeds.clear();

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,111);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,196);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,239);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};

        bech32_hrp = "tmona";

        fDefaultConsistencyChecks = false;
        fRequireStandard = true;
        m_is_test_chain = true;
        m_is_mockable_chain = false;
    }
};