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Outline

•  contract Owned
•    - function nominateNewOwner(address _ow ...
•    - function acceptOwnership()
•    - function _onlyOwner()
• interface ISynthetixDebtShare
•    - function currentPeriodId()
•    - function allowance(address account, a ...
•    - function balanceOf(address account)
•    - function balanceOfOnPeriod(address ac ...
•    - function totalSupply()
•    - function sharePercent(address account ...
•    - function sharePercentOnPeriod(address ...
•    - function takeSnapshot(uint128 id)
•    - function mintShare(address account, u ...
•    - function burnShare(address account, u ...
•    - function approve(address, uint256)
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function addAuthorizedBroker(address ...
•    - function removeAuthorizedBroker(addre ...
•    - function addAuthorizedToSnapshot(addr ...
•    - function removeAuthorizedToSnapshot(a ...
• interface IAddressResolver
•    - function getAddress(bytes32 name)
•    - function getSynth(bytes32 key)
•    - function requireAndGetAddress(bytes32 ...
• interface ISynth
•    - function currencyKey()
•    - function transferableSynths(address a ...
•    - function transferAndSettle(address to ...
•    - function transferFromAndSettle(
•    - function burn(address account, uint a ...
•    - function issue(address account, uint ...
• interface IIssuer
•    - function anySynthOrSNXRateIsInvalid()
•    - function availableCurrencyKeys()
•    - function availableSynthCount()
•    - function availableSynths(uint index)
•    - function canBurnSynths(address accoun ...
•    - function collateral(address account)
•    - function collateralisationRatio(addre ...
•    - function collateralisationRatioAndAny ...
•    - function debtBalanceOf(address issuer ...
•    - function issuanceRatio()
•    - function lastIssueEvent(address accou ...
•    - function maxIssuableSynths(address is ...
•    - function minimumStakeTime()
•    - function remainingIssuableSynths(addr ...
•    - function synths(bytes32 currencyKey)
•    - function getSynths(bytes32[] calldata ...
•    - function synthsByAddress(address synt ...
•    - function totalIssuedSynths(bytes32 cu ...
•    - function transferableSynthetixAndAnyR ...
•    - function issueSynths(address from, ui ...
•    - function issueSynthsOnBehalf(
•    - function issueMaxSynths(address from)
•    - function issueMaxSynthsOnBehalf(addre ...
•    - function burnSynths(address from, uin ...
•    - function burnSynthsOnBehalf(
•    - function burnSynthsToTarget(address f ...
•    - function burnSynthsToTargetOnBehalf(a ...
•    - function burnForRedemption(
•    - function liquidateDelinquentAccount(
•    - function setCurrentPeriodId(uint128 p ...
•  contract AddressResolver is Owned, ...
•    - function importAddresses(bytes32[] ca ...
•    - function rebuildCaches(MixinResolver[ ...
•    - function areAddressesImported(bytes32 ...
•    - function getAddress(bytes32 name)
•    - function requireAndGetAddress(bytes32 ...
•    - function getSynth(bytes32 key)
•  contract MixinResolver
•    - function combineArrays(bytes32[] memo ...
•    - function resolverAddressesRequired()
•    - function rebuildCache()
•    - function isResolverCached()
•    - function requireAndGetAddress(bytes32 ...
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b)
• library SafeDecimalMath
•    - function unit()
•    - function preciseUnit()
•    - function multiplyDecimal(uint x, uint ...
•    - function _multiplyDecimalRound(
•    - function multiplyDecimalRoundPrecise( ...
•    - function multiplyDecimalRound(uint x, ...
•    - function divideDecimal(uint x, uint y ...
•    - function _divideDecimalRound(
•    - function divideDecimalRound(uint x, u ...
•    - function divideDecimalRoundPrecise(ui ...
•    - function decimalToPreciseDecimal(uint ...
•    - function preciseDecimalToDecimal(uint ...
•    - function floorsub(uint a, uint b)
•    - function signedAbs(int x)
•    - function abs(int x)
•  contract SynthetixDebtShare is Own ... *
•    - function resolverAddressesRequired()
•    - function balanceOf(address account)
•    - function balanceOfOnPeriod(address ac ...
•    - function totalSupply()
•    - function sharePercent(address account ...
•    - function sharePercentOnPeriod(address ...
•    - function allowance(address, address s ...
•    - function addAuthorizedBroker(address ...
•    - function removeAuthorizedBroker(addre ...
•    - function addAuthorizedToSnapshot(addr ...
•    - function removeAuthorizedToSnapshot(a ...
•    - function takeSnapshot(uint128 id)
•    - function mintShare(address account, u ...
•    - function burnShare(address account, u ...
•    - function approve(address, uint256)
•    - function transfer(address, uint256)
•    - function transferFrom(address from, a ...
•    - function importAddresses(address[] ca ...
•    - function finishSetup()
•    - function _increaseBalance(address acc ...
•    - function _deductBalance(address accou ...

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/**
 *Submitted for verification at Etherscan.io on 2022-02-09
*/

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: SynthetixDebtShare.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/SynthetixDebtShare.sol
* Docs: https://docs.synthetix.io/contracts/SynthetixDebtShare
*
* Contract Dependencies: 
*	- IAddressResolver
*	- ISynthetixDebtShare
*	- MixinResolver
*	- Owned
* Libraries: 
*	- SafeDecimalMath
*	- SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2022 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/



pragma solidity ^0.5.16;

// https://docs.synthetix.io/contracts/source/contracts/owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner {
        _onlyOwner();
        _;
    }

    function _onlyOwner() private view {
        require(msg.sender == owner, "Only the contract owner may perform this action");
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}


// https://docs.synthetix.io/contracts/source/interfaces/isynthetixdebtshare
interface ISynthetixDebtShare {
    // Views

    function currentPeriodId() external view returns (uint128);

    function allowance(address account, address spender) external view returns (uint);

    function balanceOf(address account) external view returns (uint);

    function balanceOfOnPeriod(address account, uint periodId) external view returns (uint);

    function totalSupply() external view returns (uint);

    function sharePercent(address account) external view returns (uint);

    function sharePercentOnPeriod(address account, uint periodId) external view returns (uint);

    // Mutative functions

    function takeSnapshot(uint128 id) external;

    function mintShare(address account, uint256 amount) external;

    function burnShare(address account, uint256 amount) external;

    function approve(address, uint256) external pure returns (bool);

    function transfer(address to, uint256 amount) external pure returns(bool);

    function transferFrom(address from, address to, uint256 amount) external returns(bool);

    function addAuthorizedBroker(address target) external;

    function removeAuthorizedBroker(address target) external;

    function addAuthorizedToSnapshot(address target) external;

    function removeAuthorizedToSnapshot(address target) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iaddressresolver
interface IAddressResolver {
    function getAddress(bytes32 name) external view returns (address);

    function getSynth(bytes32 key) external view returns (address);

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address);
}


// https://docs.synthetix.io/contracts/source/interfaces/isynth
interface ISynth {
    // Views
    function currencyKey() external view returns (bytes32);

    function transferableSynths(address account) external view returns (uint);

    // Mutative functions
    function transferAndSettle(address to, uint value) external returns (bool);

    function transferFromAndSettle(
        address from,
        address to,
        uint value
    ) external returns (bool);

    // Restricted: used internally to Synthetix
    function burn(address account, uint amount) external;

    function issue(address account, uint amount) external;
}


// https://docs.synthetix.io/contracts/source/interfaces/iissuer
interface IIssuer {
    // Views
    function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid);

    function availableCurrencyKeys() external view returns (bytes32[] memory);

    function availableSynthCount() external view returns (uint);

    function availableSynths(uint index) external view returns (ISynth);

    function canBurnSynths(address account) external view returns (bool);

    function collateral(address account) external view returns (uint);

    function collateralisationRatio(address issuer) external view returns (uint);

    function collateralisationRatioAndAnyRatesInvalid(address _issuer)
        external
        view
        returns (uint cratio, bool anyRateIsInvalid);

    function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance);

    function issuanceRatio() external view returns (uint);

    function lastIssueEvent(address account) external view returns (uint);

    function maxIssuableSynths(address issuer) external view returns (uint maxIssuable);

    function minimumStakeTime() external view returns (uint);

    function remainingIssuableSynths(address issuer)
        external
        view
        returns (
            uint maxIssuable,
            uint alreadyIssued,
            uint totalSystemDebt
        );

    function synths(bytes32 currencyKey) external view returns (ISynth);

    function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory);

    function synthsByAddress(address synthAddress) external view returns (bytes32);

    function totalIssuedSynths(bytes32 currencyKey, bool excludeOtherCollateral) external view returns (uint);

    function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance)
        external
        view
        returns (uint transferable, bool anyRateIsInvalid);

    // Restricted: used internally to Synthetix
    function issueSynths(address from, uint amount) external;

    function issueSynthsOnBehalf(
        address issueFor,
        address from,
        uint amount
    ) external;

    function issueMaxSynths(address from) external;

    function issueMaxSynthsOnBehalf(address issueFor, address from) external;

    function burnSynths(address from, uint amount) external;

    function burnSynthsOnBehalf(
        address burnForAddress,
        address from,
        uint amount
    ) external;

    function burnSynthsToTarget(address from) external;

    function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;

    function burnForRedemption(
        address deprecatedSynthProxy,
        address account,
        uint balance
    ) external;

    function liquidateDelinquentAccount(
        address account,
        uint susdAmount,
        address liquidator
    ) external returns (uint totalRedeemed, uint amountToLiquidate);

    function setCurrentPeriodId(uint128 periodId) external;
}


// Inheritance


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/addressresolver
contract AddressResolver is Owned, IAddressResolver {
    mapping(bytes32 => address) public repository;

    constructor(address _owner) public Owned(_owner) {}

    /* ========== RESTRICTED FUNCTIONS ========== */

    function importAddresses(bytes32[] calldata names, address[] calldata destinations) external onlyOwner {
        require(names.length == destinations.length, "Input lengths must match");

        for (uint i = 0; i < names.length; i++) {
            bytes32 name = names[i];
            address destination = destinations[i];
            repository[name] = destination;
            emit AddressImported(name, destination);
        }
    }

    /* ========= PUBLIC FUNCTIONS ========== */

    function rebuildCaches(MixinResolver[] calldata destinations) external {
        for (uint i = 0; i < destinations.length; i++) {
            destinations[i].rebuildCache();
        }
    }

    /* ========== VIEWS ========== */

    function areAddressesImported(bytes32[] calldata names, address[] calldata destinations) external view returns (bool) {
        for (uint i = 0; i < names.length; i++) {
            if (repository[names[i]] != destinations[i]) {
                return false;
            }
        }
        return true;
    }

    function getAddress(bytes32 name) external view returns (address) {
        return repository[name];
    }

    function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address) {
        address _foundAddress = repository[name];
        require(_foundAddress != address(0), reason);
        return _foundAddress;
    }

    function getSynth(bytes32 key) external view returns (address) {
        IIssuer issuer = IIssuer(repository["Issuer"]);
        require(address(issuer) != address(0), "Cannot find Issuer address");
        return address(issuer.synths(key));
    }

    /* ========== EVENTS ========== */

    event AddressImported(bytes32 name, address destination);
}


// Internal references


// https://docs.synthetix.io/contracts/source/contracts/mixinresolver
contract MixinResolver {
    AddressResolver public resolver;

    mapping(bytes32 => address) private addressCache;

    constructor(address _resolver) internal {
        resolver = AddressResolver(_resolver);
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function combineArrays(bytes32[] memory first, bytes32[] memory second)
        internal
        pure
        returns (bytes32[] memory combination)
    {
        combination = new bytes32[](first.length + second.length);

        for (uint i = 0; i < first.length; i++) {
            combination[i] = first[i];
        }

        for (uint j = 0; j < second.length; j++) {
            combination[first.length + j] = second[j];
        }
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    // Note: this function is public not external in order for it to be overridden and invoked via super in subclasses
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {}

    function rebuildCache() public {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        // The resolver must call this function whenver it updates its state
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // Note: can only be invoked once the resolver has all the targets needed added
            address destination =
                resolver.requireAndGetAddress(name, string(abi.encodePacked("Resolver missing target: ", name)));
            addressCache[name] = destination;
            emit CacheUpdated(name, destination);
        }
    }

    /* ========== VIEWS ========== */

    function isResolverCached() external view returns (bool) {
        bytes32[] memory requiredAddresses = resolverAddressesRequired();
        for (uint i = 0; i < requiredAddresses.length; i++) {
            bytes32 name = requiredAddresses[i];
            // false if our cache is invalid or if the resolver doesn't have the required address
            if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) {
                return false;
            }
        }

        return true;
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    function requireAndGetAddress(bytes32 name) internal view returns (address) {
        address _foundAddress = addressCache[name];
        require(_foundAddress != address(0), string(abi.encodePacked("Missing address: ", name)));
        return _foundAddress;
    }

    /* ========== EVENTS ========== */

    event CacheUpdated(bytes32 name, address destination);
}


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}


// Libraries


// https://docs.synthetix.io/contracts/source/libraries/safedecimalmath
library SafeDecimalMath {
    using SafeMath for uint;

    /* Number of decimal places in the representations. */
    uint8 public constant decimals = 18;
    uint8 public constant highPrecisionDecimals = 27;

    /* The number representing 1.0. */
    uint public constant UNIT = 10**uint(decimals);

    /* The number representing 1.0 for higher fidelity numbers. */
    uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
    uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);

    /**
     * @return Provides an interface to UNIT.
     */
    function unit() external pure returns (uint) {
        return UNIT;
    }

    /**
     * @return Provides an interface to PRECISE_UNIT.
     */
    function preciseUnit() external pure returns (uint) {
        return PRECISE_UNIT;
    }

    /**
     * @return The result of multiplying x and y, interpreting the operands as fixed-point
     * decimals.
     *
     * @dev A unit factor is divided out after the product of x and y is evaluated,
     * so that product must be less than 2**256. As this is an integer division,
     * the internal division always rounds down. This helps save on gas. Rounding
     * is more expensive on gas.
     */
    function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        return x.mul(y) / UNIT;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of the specified precision unit.
     *
     * @dev The operands should be in the form of a the specified unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function _multiplyDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        /* Divide by UNIT to remove the extra factor introduced by the product. */
        uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a precise unit.
     *
     * @dev The operands should be in the precise unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @return The result of safely multiplying x and y, interpreting the operands
     * as fixed-point decimals of a standard unit.
     *
     * @dev The operands should be in the standard unit factor which will be
     * divided out after the product of x and y is evaluated, so that product must be
     * less than 2**256.
     *
     * Unlike multiplyDecimal, this function rounds the result to the nearest increment.
     * Rounding is useful when you need to retain fidelity for small decimal numbers
     * (eg. small fractions or percentages).
     */
    function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _multiplyDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is a high
     * precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and UNIT must be less than 2**256. As
     * this is an integer division, the result is always rounded down.
     * This helps save on gas. Rounding is more expensive on gas.
     */
    function divideDecimal(uint x, uint y) internal pure returns (uint) {
        /* Reintroduce the UNIT factor that will be divided out by y. */
        return x.mul(UNIT).div(y);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * decimal in the precision unit specified in the parameter.
     *
     * @dev y is divided after the product of x and the specified precision unit
     * is evaluated, so the product of x and the specified precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function _divideDecimalRound(
        uint x,
        uint y,
        uint precisionUnit
    ) private pure returns (uint) {
        uint resultTimesTen = x.mul(precisionUnit * 10).div(y);

        if (resultTimesTen % 10 >= 5) {
            resultTimesTen += 10;
        }

        return resultTimesTen / 10;
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * standard precision decimal.
     *
     * @dev y is divided after the product of x and the standard precision unit
     * is evaluated, so the product of x and the standard precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, UNIT);
    }

    /**
     * @return The result of safely dividing x and y. The return value is as a rounded
     * high precision decimal.
     *
     * @dev y is divided after the product of x and the high precision unit
     * is evaluated, so the product of x and the high precision unit must
     * be less than 2**256. The result is rounded to the nearest increment.
     */
    function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
        return _divideDecimalRound(x, y, PRECISE_UNIT);
    }

    /**
     * @dev Convert a standard decimal representation to a high precision one.
     */
    function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
        return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
    }

    /**
     * @dev Convert a high precision decimal to a standard decimal representation.
     */
    function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
        uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);

        if (quotientTimesTen % 10 >= 5) {
            quotientTimesTen += 10;
        }

        return quotientTimesTen / 10;
    }

    // Computes `a - b`, setting the value to 0 if b > a.
    function floorsub(uint a, uint b) internal pure returns (uint) {
        return b >= a ? 0 : a - b;
    }

    /* ---------- Utilities ---------- */
    /*
     * Absolute value of the input, returned as a signed number.
     */
    function signedAbs(int x) internal pure returns (int) {
        return x < 0 ? -x : x;
    }

    /*
     * Absolute value of the input, returned as an unsigned number.
     */
    function abs(int x) internal pure returns (uint) {
        return uint(signedAbs(x));
    }
}


// Inheritance


// Libraries


// https://docs.synthetix.io/contracts/source/contracts/synthetixdebtshare
contract SynthetixDebtShare is Owned, MixinResolver, ISynthetixDebtShare {
    using SafeMath for uint;
    using SafeDecimalMath for uint;

    struct PeriodBalance {
        uint128 amount;
        uint128 periodId;
    }

    bytes32 public constant CONTRACT_NAME = "SynthetixDebtShare";

    bytes32 private constant CONTRACT_ISSUER = "Issuer";

    uint internal constant MAX_PERIOD_ITERATE = 30;

    /* ========== STATE VARIABLES ========== */

    /**
     * Addresses selected by owner which are allowed to call `transferFrom` to manage debt shares
     */
    mapping(address => bool) public authorizedBrokers;

    /**
     * Addresses selected by owner which are allowed to call `takeSnapshot`
     * `takeSnapshot` is not public because only a small number of snapshots can be retained for a period of time, and so they
     * must be controlled to prevent censorship
     */
    mapping(address => bool) public authorizedToSnapshot;

    /**
     * Records a user's balance as it changes from period to period.
     * The last item in the array always represents the user's most recent balance
     * The intermediate balance is only recorded if 
     * `currentPeriodId` differs (which would happen upon a call to `setCurrentPeriodId`)
     */
    mapping(address => PeriodBalance[]) public balances;

    /**
     * Records totalSupply as it changes from period to period
     * Similar to `balances`, the `totalSupplyOnPeriod` at index `currentPeriodId` matches the current total supply
     * Any other period ID would represent its most recent totalSupply before the period ID changed.
     */
    mapping(uint => uint) public totalSupplyOnPeriod;


    /* ERC20 fields. */
    string public name;
    string public symbol;
    uint8 public decimals;

    /**
     * Period ID used for recording accounting changes
     * Can only increment
     */
    uint128 public currentPeriodId;

    /**
     * Prevents the owner from making further changes to debt shares after initial import
     */
    bool public isInitialized = false;

    constructor(address _owner, address _resolver) public Owned(_owner) MixinResolver(_resolver) {
        name = "Synthetix Debt Shares";
        symbol = "SDS";
        decimals = 18;

        // NOTE: must match initial fee period ID on `FeePool` constructor if issuer wont report
        currentPeriodId = 1;
    }
    function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {
        addresses = new bytes32[](1);
        addresses[0] = CONTRACT_ISSUER;
    }

    /* ========== VIEWS ========== */

    function balanceOf(address account) public view returns (uint) {
        uint accountPeriodHistoryCount = balances[account].length;

        if (accountPeriodHistoryCount == 0) {
            return 0;
        }

        return uint(balances[account][accountPeriodHistoryCount - 1].amount);
    }

    function balanceOfOnPeriod(address account, uint periodId) public view returns (uint) {
        uint accountPeriodHistoryCount = balances[account].length;

        int oldestHistoryIterate = int(MAX_PERIOD_ITERATE < accountPeriodHistoryCount ? accountPeriodHistoryCount - MAX_PERIOD_ITERATE : 0);
        int i;
        for (i = int(accountPeriodHistoryCount) - 1;i >= oldestHistoryIterate;i--) {
            if (balances[account][uint(i)].periodId <= periodId) {
                return uint(balances[account][uint(i)].amount);
            }
        }

        require(i < 0, "SynthetixDebtShare: not found in recent history");
        return 0;
    }

    function totalSupply() public view returns (uint) {
        return totalSupplyOnPeriod[currentPeriodId];
    }

    function sharePercent(address account) external view returns (uint) {
        return sharePercentOnPeriod(account, currentPeriodId);
    }

    function sharePercentOnPeriod(address account, uint periodId) public view returns (uint) {
        uint balance = balanceOfOnPeriod(account, periodId);
        
        if (balance == 0) {
            return 0;
        }
        
        return balance.divideDecimal(totalSupplyOnPeriod[periodId]);
    }

    function allowance(address, address spender) public view returns (uint) {
        if (authorizedBrokers[spender]) {
            return uint(-1);
        }
        else {
            return 0;
        }
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function addAuthorizedBroker(address target) external onlyOwner {
        authorizedBrokers[target] = true;
        emit ChangeAuthorizedBroker(target, true);
    }

    function removeAuthorizedBroker(address target) external onlyOwner {
        authorizedBrokers[target] = false;
        emit ChangeAuthorizedBroker(target, false);
    }

    function addAuthorizedToSnapshot(address target) external onlyOwner {
        authorizedToSnapshot[target] = true;
        emit ChangeAuthorizedToSnapshot(target, true);
    }

    function removeAuthorizedToSnapshot(address target) external onlyOwner {
        authorizedToSnapshot[target] = false;
        emit ChangeAuthorizedToSnapshot(target, false);
    }

    function takeSnapshot(uint128 id) external onlyAuthorizedToSnapshot {
        require(id > currentPeriodId, "period id must always increase");
        totalSupplyOnPeriod[id] = totalSupplyOnPeriod[currentPeriodId];
        currentPeriodId = id;
    }
        
    function mintShare(address account, uint256 amount) external onlyIssuer {
        require(account != address(0), "ERC20: mint to the zero address");

        _increaseBalance(account, amount);

        totalSupplyOnPeriod[currentPeriodId] = totalSupplyOnPeriod[currentPeriodId].add(amount);

        emit Transfer(address(0), account, amount);
        emit Mint(account, amount);
    }

    function burnShare(address account, uint256 amount) external onlyIssuer {
        require(account != address(0), "ERC20: burn from zero address");

        _deductBalance(account, amount);

        totalSupplyOnPeriod[currentPeriodId] = totalSupplyOnPeriod[currentPeriodId].sub(amount);
        emit Transfer(account, address(0), amount);
        emit Burn(account, amount);
    }

    function approve(address, uint256) external pure returns(bool) {
        revert("debt shares are not transferrable");
    }

    function transfer(address, uint256) external pure returns(bool) {
        revert("debt shares are not transferrable");
    }

    function transferFrom(address from, address to, uint256 amount) external onlyAuthorizedBrokers returns(bool) {
        require(to != address(0), "ERC20: send to the zero address");

        _deductBalance(from, amount);
        _increaseBalance(to, amount);

        emit Transfer(address(from), address(to), amount);

        return true;
    }

    function importAddresses(address[] calldata accounts, uint256[] calldata amounts) external onlyOwner onlySetup {
        uint supply = totalSupplyOnPeriod[currentPeriodId];

        for (uint i = 0; i < accounts.length; i++) {
            uint curBalance = balanceOf(accounts[i]);
            if (curBalance < amounts[i]) {
                uint amount = amounts[i] - curBalance;
                _increaseBalance(accounts[i], amount);
                supply = supply.add(amount);
                emit Mint(accounts[i], amount);
                emit Transfer(address(0), accounts[i], amount);
            }
            else if (curBalance > amounts[i]) {
                uint amount = curBalance - amounts[i];
                _deductBalance(accounts[i], amount);
                supply = supply.sub(amount);
                emit Burn(accounts[i], amount);
                emit Transfer(accounts[i], address(0), amount);
            }
        }

        totalSupplyOnPeriod[currentPeriodId] = supply;
    }

    function finishSetup() external onlyOwner {
        isInitialized = true;
    }

    /* ========== INTERNAL FUNCTIONS ======== */
    function _increaseBalance(address account, uint amount) internal {
        uint accountBalanceCount = balances[account].length;

        if (accountBalanceCount == 0) {
            balances[account].push(PeriodBalance(uint128(amount), uint128(currentPeriodId)));
        }
        else {
            uint128 newAmount = uint128(uint(balances[account][accountBalanceCount - 1].amount).add(amount));

            if (balances[account][accountBalanceCount - 1].periodId != currentPeriodId) {
                balances[account].push(PeriodBalance(newAmount, currentPeriodId));
            }
            else {
                balances[account][accountBalanceCount - 1].amount = newAmount;
            }
        }
    }

    function _deductBalance(address account, uint amount) internal {
        uint accountBalanceCount = balances[account].length;

        require(accountBalanceCount != 0, "SynthetixDebtShare: account has no share to deduct");

        uint128 newAmount = uint128(uint(balances[account][accountBalanceCount - 1].amount).sub(amount));

        if (balances[account][accountBalanceCount - 1].periodId != currentPeriodId) {
            balances[account].push(PeriodBalance(
                newAmount, 
                currentPeriodId
            ));
        }
        else {
            balances[account][accountBalanceCount - 1].amount = newAmount;
        }
    }

    /* ========== MODIFIERS ========== */

    modifier onlyIssuer() {
        require(msg.sender == requireAndGetAddress(CONTRACT_ISSUER), "SynthetixDebtShare: only issuer can mint/burn");
        _;
    }

    modifier onlyAuthorizedToSnapshot() {
        require(authorizedToSnapshot[msg.sender] || msg.sender == requireAndGetAddress(CONTRACT_ISSUER), "SynthetixDebtShare: not authorized to snapshot");
        _;
    }

    modifier onlyAuthorizedBrokers() {
        require(authorizedBrokers[msg.sender], "SynthetixDebtShare: only brokers can transferFrom");
        _;
    }

    modifier onlySetup() {
        require(!isInitialized, "SynthetixDebt: only callable while still initializing");
        _;
    }

    /* ========== EVENTS ========== */
    event Mint(address indexed account, uint amount);
    event Burn(address indexed account, uint amount);
    event Transfer(address indexed from, address indexed to, uint value);

    event ChangeAuthorizedBroker(address indexed authorizedBroker, bool authorized);
    event ChangeAuthorizedToSnapshot(address indexed authorizedToSnapshot, bool authorized);
}

• No Contract Security Audit Submitted- Submit Audit Here

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-----Decoded View---------------
Arg [0] : _owner (address): 0xDe910777C787903F78C89e7a0bf7F4C435cBB1Fe
Arg [1] : _resolver (address): 0x4E3b31eB0E5CB73641EE1E65E7dCEFe520bA3ef2

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000de910777c787903f78c89e7a0bf7f4c435cbb1fe
Arg [1] : 0000000000000000000000004e3b31eb0e5cb73641ee1e65e7dcefe520ba3ef2

SafeDecimalMath : 0x84d626b2bb4d0f064067e4bf80fce7055d8f3e7b
SystemSettingsLib : 0xa62f71d599ec6179b4f6569add69ffc7e1a7a1c5