contract Configuration is Modifiable, Ownable, Servable {
    using SafeMathIntLib for int256;
    using BlockNumbUintsLib for BlockNumbUintsLib.BlockNumbUints;
    using BlockNumbIntsLib for BlockNumbIntsLib.BlockNumbInts;
    using BlockNumbDisdIntsLib for BlockNumbDisdIntsLib.BlockNumbDisdInts;
    using BlockNumbReferenceCurrenciesLib for BlockNumbReferenceCurrenciesLib.BlockNumbReferenceCurrencies;
    using BlockNumbFiguresLib for BlockNumbFiguresLib.BlockNumbFigures;

    //
    // Constants
    // -----------------------------------------------------------------------------------------------------------------
    string constant public OPERATIONAL_MODE_ACTION = "operational_mode";

    //
    // Enums
    // -----------------------------------------------------------------------------------------------------------------
    enum OperationalMode {Normal, Exit}

    //
    // Variables
    // -----------------------------------------------------------------------------------------------------------------
    OperationalMode public operationalMode = OperationalMode.Normal;

    BlockNumbUintsLib.BlockNumbUints private updateDelayBlocksByBlockNumber;
    BlockNumbUintsLib.BlockNumbUints private confirmationBlocksByBlockNumber;

    BlockNumbDisdIntsLib.BlockNumbDisdInts private tradeMakerFeeByBlockNumber;
    BlockNumbDisdIntsLib.BlockNumbDisdInts private tradeTakerFeeByBlockNumber;
    BlockNumbDisdIntsLib.BlockNumbDisdInts private paymentFeeByBlockNumber;
    mapping(address => mapping(uint256 => BlockNumbDisdIntsLib.BlockNumbDisdInts)) private currencyPaymentFeeByBlockNumber;

    BlockNumbIntsLib.BlockNumbInts private tradeMakerMinimumFeeByBlockNumber;
    BlockNumbIntsLib.BlockNumbInts private tradeTakerMinimumFeeByBlockNumber;
    BlockNumbIntsLib.BlockNumbInts private paymentMinimumFeeByBlockNumber;
    mapping(address => mapping(uint256 => BlockNumbIntsLib.BlockNumbInts)) private currencyPaymentMinimumFeeByBlockNumber;

    BlockNumbReferenceCurrenciesLib.BlockNumbReferenceCurrencies private feeCurrencyByCurrencyBlockNumber;

    BlockNumbUintsLib.BlockNumbUints private walletLockTimeoutByBlockNumber;
    BlockNumbUintsLib.BlockNumbUints private cancelOrderChallengeTimeoutByBlockNumber;
    BlockNumbUintsLib.BlockNumbUints private settlementChallengeTimeoutByBlockNumber;

    BlockNumbUintsLib.BlockNumbUints private fraudStakeFractionByBlockNumber;
    BlockNumbUintsLib.BlockNumbUints private walletSettlementStakeFractionByBlockNumber;
    BlockNumbUintsLib.BlockNumbUints private operatorSettlementStakeFractionByBlockNumber;

    BlockNumbFiguresLib.BlockNumbFigures private operatorSettlementStakeByBlockNumber;

    uint256 public earliestSettlementBlockNumber;
    bool public earliestSettlementBlockNumberUpdateDisabled;

    //
    // Events
    // -----------------------------------------------------------------------------------------------------------------
    event SetOperationalModeExitEvent();
    event SetUpdateDelayBlocksEvent(uint256 fromBlockNumber, uint256 newBlocks);
    event SetConfirmationBlocksEvent(uint256 fromBlockNumber, uint256 newBlocks);
    event SetTradeMakerFeeEvent(uint256 fromBlockNumber, int256 nominal, int256[] discountTiers, int256[] discountValues);
    event SetTradeTakerFeeEvent(uint256 fromBlockNumber, int256 nominal, int256[] discountTiers, int256[] discountValues);
    event SetPaymentFeeEvent(uint256 fromBlockNumber, int256 nominal, int256[] discountTiers, int256[] discountValues);
    event SetCurrencyPaymentFeeEvent(uint256 fromBlockNumber, address currencyCt, uint256 currencyId, int256 nominal,
        int256[] discountTiers, int256[] discountValues);
    event SetTradeMakerMinimumFeeEvent(uint256 fromBlockNumber, int256 nominal);
    event SetTradeTakerMinimumFeeEvent(uint256 fromBlockNumber, int256 nominal);
    event SetPaymentMinimumFeeEvent(uint256 fromBlockNumber, int256 nominal);
    event SetCurrencyPaymentMinimumFeeEvent(uint256 fromBlockNumber, address currencyCt, uint256 currencyId, int256 nominal);
    event SetFeeCurrencyEvent(uint256 fromBlockNumber, address referenceCurrencyCt, uint256 referenceCurrencyId,
        address feeCurrencyCt, uint256 feeCurrencyId);
    event SetWalletLockTimeoutEvent(uint256 fromBlockNumber, uint256 timeoutInSeconds);
    event SetCancelOrderChallengeTimeoutEvent(uint256 fromBlockNumber, uint256 timeoutInSeconds);
    event SetSettlementChallengeTimeoutEvent(uint256 fromBlockNumber, uint256 timeoutInSeconds);
    event SetWalletSettlementStakeFractionEvent(uint256 fromBlockNumber, uint256 stakeFraction);
    event SetOperatorSettlementStakeFractionEvent(uint256 fromBlockNumber, uint256 stakeFraction);
    event SetOperatorSettlementStakeEvent(uint256 fromBlockNumber, int256 stakeAmount, address stakeCurrencyCt,
        uint256 stakeCurrencyId);
    event SetFraudStakeFractionEvent(uint256 fromBlockNumber, uint256 stakeFraction);
    event SetEarliestSettlementBlockNumberEvent(uint256 earliestSettlementBlockNumber);
    event DisableEarliestSettlementBlockNumberUpdateEvent();

    //
    // Constructor
    // -----------------------------------------------------------------------------------------------------------------
    constructor(address deployer) Ownable(deployer) public {
        updateDelayBlocksByBlockNumber.addEntry(block.number, 0);
    }

    //
    // Public functions
    // -----------------------------------------------------------------------------------------------------------------
    /// @notice Set operational mode to Exit
    /// @dev Once operational mode is set to Exit it may not be set back to Normal
    function setOperationalModeExit()
    public
    onlyEnabledServiceAction(OPERATIONAL_MODE_ACTION)
    {
        operationalMode = OperationalMode.Exit;
        emit SetOperationalModeExitEvent();
    }

    /// @notice Return true if operational mode is Normal
    function isOperationalModeNormal()
    public
    view
    returns (bool)
    {
        return OperationalMode.Normal == operationalMode;
    }

    /// @notice Return true if operational mode is Exit
    function isOperationalModeExit()
    public
    view
    returns (bool)
    {
        return OperationalMode.Exit == operationalMode;
    }

    /// @notice Get the current value of update delay blocks
    /// @return The value of update delay blocks
    function updateDelayBlocks()
    public
    view
    returns (uint256)
    {
        return updateDelayBlocksByBlockNumber.currentValue();
    }

    /// @notice Get the count of update delay blocks values
    /// @return The count of update delay blocks values
    function updateDelayBlocksCount()
    public
    view
    returns (uint256)
    {
        return updateDelayBlocksByBlockNumber.count();
    }

    /// @notice Set the number of update delay blocks
    /// @param fromBlockNumber Block number from which the update applies
    /// @param newUpdateDelayBlocks The new update delay blocks value
    function setUpdateDelayBlocks(uint256 fromBlockNumber, uint256 newUpdateDelayBlocks)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        updateDelayBlocksByBlockNumber.addEntry(fromBlockNumber, newUpdateDelayBlocks);
        emit SetUpdateDelayBlocksEvent(fromBlockNumber, newUpdateDelayBlocks);
    }

    /// @notice Get the current value of confirmation blocks
    /// @return The value of confirmation blocks
    function confirmationBlocks()
    public
    view
    returns (uint256)
    {
        return confirmationBlocksByBlockNumber.currentValue();
    }

    /// @notice Get the count of confirmation blocks values
    /// @return The count of confirmation blocks values
    function confirmationBlocksCount()
    public
    view
    returns (uint256)
    {
        return confirmationBlocksByBlockNumber.count();
    }

    /// @notice Set the number of confirmation blocks
    /// @param fromBlockNumber Block number from which the update applies
    /// @param newConfirmationBlocks The new confirmation blocks value
    function setConfirmationBlocks(uint256 fromBlockNumber, uint256 newConfirmationBlocks)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        confirmationBlocksByBlockNumber.addEntry(fromBlockNumber, newConfirmationBlocks);
        emit SetConfirmationBlocksEvent(fromBlockNumber, newConfirmationBlocks);
    }

    /// @notice Get number of trade maker fee block number tiers
    function tradeMakerFeesCount()
    public
    view
    returns (uint256)
    {
        return tradeMakerFeeByBlockNumber.count();
    }

    /// @notice Get trade maker relative fee at given block number, possibly discounted by discount tier value
    /// @param blockNumber The concerned block number
    /// @param discountTier The concerned discount tier
    function tradeMakerFee(uint256 blockNumber, int256 discountTier)
    public
    view
    returns (int256)
    {
        return tradeMakerFeeByBlockNumber.discountedValueAt(blockNumber, discountTier);
    }

    /// @notice Set trade maker nominal relative fee and discount tiers and values at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Nominal relative fee
    /// @param nominal Discount tier levels
    /// @param nominal Discount values
    function setTradeMakerFee(uint256 fromBlockNumber, int256 nominal, int256[] memory discountTiers, int256[] memory discountValues)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        tradeMakerFeeByBlockNumber.addDiscountedEntry(fromBlockNumber, nominal, discountTiers, discountValues);
        emit SetTradeMakerFeeEvent(fromBlockNumber, nominal, discountTiers, discountValues);
    }

    /// @notice Get number of trade taker fee block number tiers
    function tradeTakerFeesCount()
    public
    view
    returns (uint256)
    {
        return tradeTakerFeeByBlockNumber.count();
    }

    /// @notice Get trade taker relative fee at given block number, possibly discounted by discount tier value
    /// @param blockNumber The concerned block number
    /// @param discountTier The concerned discount tier
    function tradeTakerFee(uint256 blockNumber, int256 discountTier)
    public
    view
    returns (int256)
    {
        return tradeTakerFeeByBlockNumber.discountedValueAt(blockNumber, discountTier);
    }

    /// @notice Set trade taker nominal relative fee and discount tiers and values at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Nominal relative fee
    /// @param nominal Discount tier levels
    /// @param nominal Discount values
    function setTradeTakerFee(uint256 fromBlockNumber, int256 nominal, int256[] memory discountTiers, int256[] memory discountValues)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        tradeTakerFeeByBlockNumber.addDiscountedEntry(fromBlockNumber, nominal, discountTiers, discountValues);
        emit SetTradeTakerFeeEvent(fromBlockNumber, nominal, discountTiers, discountValues);
    }

    /// @notice Get number of payment fee block number tiers
    function paymentFeesCount()
    public
    view
    returns (uint256)
    {
        return paymentFeeByBlockNumber.count();
    }

    /// @notice Get payment relative fee at given block number, possibly discounted by discount tier value
    /// @param blockNumber The concerned block number
    /// @param discountTier The concerned discount tier
    function paymentFee(uint256 blockNumber, int256 discountTier)
    public
    view
    returns (int256)
    {
        return paymentFeeByBlockNumber.discountedValueAt(blockNumber, discountTier);
    }

    /// @notice Set payment nominal relative fee and discount tiers and values at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Nominal relative fee
    /// @param nominal Discount tier levels
    /// @param nominal Discount values
    function setPaymentFee(uint256 fromBlockNumber, int256 nominal, int256[] memory discountTiers, int256[] memory discountValues)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        paymentFeeByBlockNumber.addDiscountedEntry(fromBlockNumber, nominal, discountTiers, discountValues);
        emit SetPaymentFeeEvent(fromBlockNumber, nominal, discountTiers, discountValues);
    }

    /// @notice Get number of payment fee block number tiers of given currency
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    function currencyPaymentFeesCount(address currencyCt, uint256 currencyId)
    public
    view
    returns (uint256)
    {
        return currencyPaymentFeeByBlockNumber[currencyCt][currencyId].count();
    }

    /// @notice Get payment relative fee for given currency at given block number, possibly discounted by
    /// discount tier value
    /// @param blockNumber The concerned block number
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    /// @param discountTier The concerned discount tier
    function currencyPaymentFee(uint256 blockNumber, address currencyCt, uint256 currencyId, int256 discountTier)
    public
    view
    returns (int256)
    {
        if (0 < currencyPaymentFeeByBlockNumber[currencyCt][currencyId].count())
            return currencyPaymentFeeByBlockNumber[currencyCt][currencyId].discountedValueAt(
                blockNumber, discountTier
            );
        else
            return paymentFee(blockNumber, discountTier);
    }

    /// @notice Set payment nominal relative fee and discount tiers and values for given currency at given
    /// block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    /// @param nominal Nominal relative fee
    /// @param nominal Discount tier levels
    /// @param nominal Discount values
    function setCurrencyPaymentFee(uint256 fromBlockNumber, address currencyCt, uint256 currencyId, int256 nominal,
        int256[] memory discountTiers, int256[] memory discountValues)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        currencyPaymentFeeByBlockNumber[currencyCt][currencyId].addDiscountedEntry(
            fromBlockNumber, nominal, discountTiers, discountValues
        );
        emit SetCurrencyPaymentFeeEvent(
            fromBlockNumber, currencyCt, currencyId, nominal, discountTiers, discountValues
        );
    }

    /// @notice Get number of minimum trade maker fee block number tiers
    function tradeMakerMinimumFeesCount()
    public
    view
    returns (uint256)
    {
        return tradeMakerMinimumFeeByBlockNumber.count();
    }

    /// @notice Get trade maker minimum relative fee at given block number
    /// @param blockNumber The concerned block number
    function tradeMakerMinimumFee(uint256 blockNumber)
    public
    view
    returns (int256)
    {
        return tradeMakerMinimumFeeByBlockNumber.valueAt(blockNumber);
    }

    /// @notice Set trade maker minimum relative fee at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Minimum relative fee
    function setTradeMakerMinimumFee(uint256 fromBlockNumber, int256 nominal)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        tradeMakerMinimumFeeByBlockNumber.addEntry(fromBlockNumber, nominal);
        emit SetTradeMakerMinimumFeeEvent(fromBlockNumber, nominal);
    }

    /// @notice Get number of minimum trade taker fee block number tiers
    function tradeTakerMinimumFeesCount()
    public
    view
    returns (uint256)
    {
        return tradeTakerMinimumFeeByBlockNumber.count();
    }

    /// @notice Get trade taker minimum relative fee at given block number
    /// @param blockNumber The concerned block number
    function tradeTakerMinimumFee(uint256 blockNumber)
    public
    view
    returns (int256)
    {
        return tradeTakerMinimumFeeByBlockNumber.valueAt(blockNumber);
    }

    /// @notice Set trade taker minimum relative fee at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Minimum relative fee
    function setTradeTakerMinimumFee(uint256 fromBlockNumber, int256 nominal)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        tradeTakerMinimumFeeByBlockNumber.addEntry(fromBlockNumber, nominal);
        emit SetTradeTakerMinimumFeeEvent(fromBlockNumber, nominal);
    }

    /// @notice Get number of minimum payment fee block number tiers
    function paymentMinimumFeesCount()
    public
    view
    returns (uint256)
    {
        return paymentMinimumFeeByBlockNumber.count();
    }

    /// @notice Get payment minimum relative fee at given block number
    /// @param blockNumber The concerned block number
    function paymentMinimumFee(uint256 blockNumber)
    public
    view
    returns (int256)
    {
        return paymentMinimumFeeByBlockNumber.valueAt(blockNumber);
    }

    /// @notice Set payment minimum relative fee at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param nominal Minimum relative fee
    function setPaymentMinimumFee(uint256 fromBlockNumber, int256 nominal)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        paymentMinimumFeeByBlockNumber.addEntry(fromBlockNumber, nominal);
        emit SetPaymentMinimumFeeEvent(fromBlockNumber, nominal);
    }

    /// @notice Get number of minimum payment fee block number tiers for given currency
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    function currencyPaymentMinimumFeesCount(address currencyCt, uint256 currencyId)
    public
    view
    returns (uint256)
    {
        return currencyPaymentMinimumFeeByBlockNumber[currencyCt][currencyId].count();
    }

    /// @notice Get payment minimum relative fee for given currency at given block number
    /// @param blockNumber The concerned block number
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    function currencyPaymentMinimumFee(uint256 blockNumber, address currencyCt, uint256 currencyId)
    public
    view
    returns (int256)
    {
        if (0 < currencyPaymentMinimumFeeByBlockNumber[currencyCt][currencyId].count())
            return currencyPaymentMinimumFeeByBlockNumber[currencyCt][currencyId].valueAt(blockNumber);
        else
            return paymentMinimumFee(blockNumber);
    }

    /// @notice Set payment minimum relative fee for given currency at given block number tier
    /// @param fromBlockNumber Block number from which the update applies
    /// @param currencyCt The address of the concerned currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned currency (0 for ETH and ERC20)
    /// @param nominal Minimum relative fee
    function setCurrencyPaymentMinimumFee(uint256 fromBlockNumber, address currencyCt, uint256 currencyId, int256 nominal)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        currencyPaymentMinimumFeeByBlockNumber[currencyCt][currencyId].addEntry(fromBlockNumber, nominal);
        emit SetCurrencyPaymentMinimumFeeEvent(fromBlockNumber, currencyCt, currencyId, nominal);
    }

    /// @notice Get number of fee currencies for the given reference currency
    /// @param currencyCt The address of the concerned reference currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned reference currency (0 for ETH and ERC20)
    function feeCurrenciesCount(address currencyCt, uint256 currencyId)
    public
    view
    returns (uint256)
    {
        return feeCurrencyByCurrencyBlockNumber.count(MonetaryTypesLib.Currency(currencyCt, currencyId));
    }

    /// @notice Get the fee currency for the given reference currency at given block number
    /// @param blockNumber The concerned block number
    /// @param currencyCt The address of the concerned reference currency contract (address(0) == ETH)
    /// @param currencyId The ID of the concerned reference currency (0 for ETH and ERC20)
    function feeCurrency(uint256 blockNumber, address currencyCt, uint256 currencyId)
    public
    view
    returns (address ct, uint256 id)
    {
        MonetaryTypesLib.Currency storage _feeCurrency = feeCurrencyByCurrencyBlockNumber.currencyAt(
            MonetaryTypesLib.Currency(currencyCt, currencyId), blockNumber
        );
        ct = _feeCurrency.ct;
        id = _feeCurrency.id;
    }

    /// @notice Set the fee currency for the given reference currency at given block number
    /// @param fromBlockNumber Block number from which the update applies
    /// @param referenceCurrencyCt The address of the concerned reference currency contract (address(0) == ETH)
    /// @param referenceCurrencyId The ID of the concerned reference currency (0 for ETH and ERC20)
    /// @param feeCurrencyCt The address of the concerned fee currency contract (address(0) == ETH)
    /// @param feeCurrencyId The ID of the concerned fee currency (0 for ETH and ERC20)
    function setFeeCurrency(uint256 fromBlockNumber, address referenceCurrencyCt, uint256 referenceCurrencyId,
        address feeCurrencyCt, uint256 feeCurrencyId)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        feeCurrencyByCurrencyBlockNumber.addEntry(
            fromBlockNumber,
            MonetaryTypesLib.Currency(referenceCurrencyCt, referenceCurrencyId),
            MonetaryTypesLib.Currency(feeCurrencyCt, feeCurrencyId)
        );
        emit SetFeeCurrencyEvent(fromBlockNumber, referenceCurrencyCt, referenceCurrencyId,
            feeCurrencyCt, feeCurrencyId);
    }

    /// @notice Get the current value of wallet lock timeout
    /// @return The value of wallet lock timeout
    function walletLockTimeout()
    public
    view
    returns (uint256)
    {
        return walletLockTimeoutByBlockNumber.currentValue();
    }

    /// @notice Set timeout of wallet lock
    /// @param fromBlockNumber Block number from which the update applies
    /// @param timeoutInSeconds Timeout duration in seconds
    function setWalletLockTimeout(uint256 fromBlockNumber, uint256 timeoutInSeconds)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        walletLockTimeoutByBlockNumber.addEntry(fromBlockNumber, timeoutInSeconds);
        emit SetWalletLockTimeoutEvent(fromBlockNumber, timeoutInSeconds);
    }

    /// @notice Get the current value of cancel order challenge timeout
    /// @return The value of cancel order challenge timeout
    function cancelOrderChallengeTimeout()
    public
    view
    returns (uint256)
    {
        return cancelOrderChallengeTimeoutByBlockNumber.currentValue();
    }

    /// @notice Set timeout of cancel order challenge
    /// @param fromBlockNumber Block number from which the update applies
    /// @param timeoutInSeconds Timeout duration in seconds
    function setCancelOrderChallengeTimeout(uint256 fromBlockNumber, uint256 timeoutInSeconds)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        cancelOrderChallengeTimeoutByBlockNumber.addEntry(fromBlockNumber, timeoutInSeconds);
        emit SetCancelOrderChallengeTimeoutEvent(fromBlockNumber, timeoutInSeconds);
    }

    /// @notice Get the current value of settlement challenge timeout
    /// @return The value of settlement challenge timeout
    function settlementChallengeTimeout()
    public
    view
    returns (uint256)
    {
        return settlementChallengeTimeoutByBlockNumber.currentValue();
    }

    /// @notice Set timeout of settlement challenges
    /// @param fromBlockNumber Block number from which the update applies
    /// @param timeoutInSeconds Timeout duration in seconds
    function setSettlementChallengeTimeout(uint256 fromBlockNumber, uint256 timeoutInSeconds)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        settlementChallengeTimeoutByBlockNumber.addEntry(fromBlockNumber, timeoutInSeconds);
        emit SetSettlementChallengeTimeoutEvent(fromBlockNumber, timeoutInSeconds);
    }

    /// @notice Get the current value of fraud stake fraction
    /// @return The value of fraud stake fraction
    function fraudStakeFraction()
    public
    view
    returns (uint256)
    {
        return fraudStakeFractionByBlockNumber.currentValue();
    }

    /// @notice Set fraction of security bond that will be gained from successfully challenging
    /// in fraud challenge
    /// @param fromBlockNumber Block number from which the update applies
    /// @param stakeFraction The fraction gained
    function setFraudStakeFraction(uint256 fromBlockNumber, uint256 stakeFraction)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        fraudStakeFractionByBlockNumber.addEntry(fromBlockNumber, stakeFraction);
        emit SetFraudStakeFractionEvent(fromBlockNumber, stakeFraction);
    }

    /// @notice Get the current value of wallet settlement stake fraction
    /// @return The value of wallet settlement stake fraction
    function walletSettlementStakeFraction()
    public
    view
    returns (uint256)
    {
        return walletSettlementStakeFractionByBlockNumber.currentValue();
    }

    /// @notice Set fraction of security bond that will be gained from successfully challenging
    /// in settlement challenge triggered by wallet
    /// @param fromBlockNumber Block number from which the update applies
    /// @param stakeFraction The fraction gained
    function setWalletSettlementStakeFraction(uint256 fromBlockNumber, uint256 stakeFraction)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        walletSettlementStakeFractionByBlockNumber.addEntry(fromBlockNumber, stakeFraction);
        emit SetWalletSettlementStakeFractionEvent(fromBlockNumber, stakeFraction);
    }

    /// @notice Get the current value of operator settlement stake fraction
    /// @return The value of operator settlement stake fraction
    function operatorSettlementStakeFraction()
    public
    view
    returns (uint256)
    {
        return operatorSettlementStakeFractionByBlockNumber.currentValue();
    }

    /// @notice Set fraction of security bond that will be gained from successfully challenging
    /// in settlement challenge triggered by operator
    /// @param fromBlockNumber Block number from which the update applies
    /// @param stakeFraction The fraction gained
    function setOperatorSettlementStakeFraction(uint256 fromBlockNumber, uint256 stakeFraction)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        operatorSettlementStakeFractionByBlockNumber.addEntry(fromBlockNumber, stakeFraction);
        emit SetOperatorSettlementStakeFractionEvent(fromBlockNumber, stakeFraction);
    }

    /// @notice Get the current value of operator settlement stake
    /// @return The value of operator settlement stake
    function operatorSettlementStake()
    public
    view
    returns (int256 amount, address currencyCt, uint256 currencyId)
    {
        MonetaryTypesLib.Figure storage stake = operatorSettlementStakeByBlockNumber.currentValue();
        amount = stake.amount;
        currencyCt = stake.currency.ct;
        currencyId = stake.currency.id;
    }

    /// @notice Set figure of security bond that will be gained from successfully challenging
    /// in settlement challenge triggered by operator
    /// @param fromBlockNumber Block number from which the update applies
    /// @param stakeAmount The amount gained
    /// @param stakeCurrencyCt The address of currency gained
    /// @param stakeCurrencyId The ID of currency gained
    function setOperatorSettlementStake(uint256 fromBlockNumber, int256 stakeAmount,
        address stakeCurrencyCt, uint256 stakeCurrencyId)
    public
    onlyOperator
    onlyDelayedBlockNumber(fromBlockNumber)
    {
        MonetaryTypesLib.Figure memory stake = MonetaryTypesLib.Figure(stakeAmount, MonetaryTypesLib.Currency(stakeCurrencyCt, stakeCurrencyId));
        operatorSettlementStakeByBlockNumber.addEntry(fromBlockNumber, stake);
        emit SetOperatorSettlementStakeEvent(fromBlockNumber, stakeAmount, stakeCurrencyCt, stakeCurrencyId);
    }

    /// @notice Set the block number of the earliest settlement initiation
    /// @param _earliestSettlementBlockNumber The block number of the earliest settlement
    function setEarliestSettlementBlockNumber(uint256 _earliestSettlementBlockNumber)
    public
    onlyOperator
    {
        require(!earliestSettlementBlockNumberUpdateDisabled, "Earliest settlement block number update disabled [Configuration.sol:715]");

        earliestSettlementBlockNumber = _earliestSettlementBlockNumber;
        emit SetEarliestSettlementBlockNumberEvent(earliestSettlementBlockNumber);
    }

    /// @notice Disable further updates to the earliest settlement block number
    /// @dev This operation can not be undone
    function disableEarliestSettlementBlockNumberUpdate()
    public
    onlyOperator
    {
        earliestSettlementBlockNumberUpdateDisabled = true;
        emit DisableEarliestSettlementBlockNumberUpdateEvent();
    }

    //
    // Modifiers
    // -----------------------------------------------------------------------------------------------------------------
    modifier onlyDelayedBlockNumber(uint256 blockNumber) {
        require(
            0 == updateDelayBlocksByBlockNumber.count() ||
        blockNumber >= block.number + updateDelayBlocksByBlockNumber.currentValue(),
            "Block number not sufficiently delayed [Configuration.sol:735]"
        );
        _;
    }
}
/**
 * @title Configuration
 * @notice An oracle for configurations values
 */
function operatorSettlementStake()
public
view
returns (int256 amount, address currencyCt, uint256 currencyId)
{
    MonetaryTypesLib.Figure storage stake = operatorSettlementStakeByBlockNumber.currentValue();
    amount = stake.amount;
    currencyCt = stake.currency.ct;
    currencyId = stake.currency.id;
}

/// @notice Get the current value of operator settlement stake
/// @return The value of operator settlement stake