Contract 0x7a9701453249e84fd0D5AfE5951e9cBe9ed2E90f

 
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0xda2768cc6c7f763f533c45214680d7bd4a14787c78907194324eeb5629b738dd0x60806040107803792020-09-02 7:08:57389 days 18 hrs agoTrustToken: Deployer IN  Create: TrueUSD0 Ether0.71209534370
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Contract Source Code Verified (Exact Match)

Contract Name:
TrueUSD

Compiler Version
v0.6.10+commit.00c0fcaf

Optimization Enabled:
Yes with 20000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-09-03
*/

/**
 *  ████████╗██████╗ ██╗   ██╗███████╗██╗   ██╗███████╗██████╗ 
 *  ╚══██╔══╝██╔══██╗██║   ██║██╔════╝██║   ██║██╔════╝██╔══██╗
 *     ██║   ██████╔╝██║   ██║█████╗  ██║   ██║███████╗██║  ██║
 *     ██║   ██╔══██╗██║   ██║██╔══╝  ██║   ██║╚════██║██║  ██║
 *     ██║   ██║  ██║╚██████╔╝███████╗╚██████╔╝███████║██████╔╝
 *     ╚═╝   ╚═╝  ╚═╝ ╚═════╝ ╚══════╝ ╚═════╝ ╚══════╝╚═════╝ 
 */

pragma solidity 0.6.10;

/**
 * Defines the storage layout of the token implementation contract. Any
 * newly declared state variables in future upgrades should be appended
 * to the bottom. Never remove state variables from this list, however variables
 * can be renamed. Please add _Deprecated to deprecated variables.
 */
contract ProxyStorage {
    address public owner;
    address public pendingOwner;

    bool initialized;

    address balances_Deprecated;
    address allowances_Deprecated;

    uint256 _totalSupply;

    bool private paused_Deprecated = false;
    address private globalPause_Deprecated;

    uint256 public burnMin = 0;
    uint256 public burnMax = 0;

    address registry_Deprecated;

    string name_Deprecated;
    string symbol_Deprecated;

    uint256[] gasRefundPool_Deprecated;
    uint256 private redemptionAddressCount_Deprecated;
    uint256 minimumGasPriceForFutureRefunds_Deprecated;

    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) _allowances;
    mapping(bytes32 => mapping(address => uint256)) attributes_Deprecated;

    mapping(address => address) finOps_Deprecated;
    mapping(address => mapping(address => uint256)) finOpBalances_Deprecated;
    mapping(address => uint256) finOpSupply_Deprecated;

    struct RewardAllocation {
        uint256 proportion;
        address finOp;
    }
    mapping(address => RewardAllocation[]) _rewardDistribution_Deprecated;
    uint256 maxRewardProportion_Deprecated = 1000;

    mapping(address => bool) isBlacklisted;
    mapping(address => bool) public canBurn;

    /* Additionally, we have several keccak-based storage locations.
     * If you add more keccak-based storage mappings, such as mappings, you must document them here.
     * If the length of the keccak input is the same as an existing mapping, it is possible there could be a preimage collision.
     * A preimage collision can be used to attack the contract by treating one storage location as another,
     * which would always be a critical issue.
     * Carefully examine future keccak-based storage to ensure there can be no preimage collisions.
     *******************************************************************************************************
     ** length     input                                                         usage
     *******************************************************************************************************
     ** 19         "trueXXX.proxy.owner"                                         Proxy Owner
     ** 27         "trueXXX.pending.proxy.owner"                                 Pending Proxy Owner
     ** 28         "trueXXX.proxy.implementation"                                Proxy Implementation
     ** 32         uint256(11)                                                   gasRefundPool_Deprecated
     ** 64         uint256(address),uint256(14)                                  balanceOf
     ** 64         uint256(address),keccak256(uint256(address),uint256(15))      allowance
     ** 64         uint256(address),keccak256(bytes32,uint256(16))               attributes
     **/
}

pragma solidity 0.6.10;

/**
 * @title ClamableOwnable
 * @dev The ClamableOwnable contract is a copy of Claimable Contract by Zeppelin.
 * and provides basic authorization control functions. Inherits storage layout of
 * ProxyStorage.
 */
contract ClaimableOwnable is ProxyStorage {
    /**
     * @dev emitted when ownership is transferred
     * @param previousOwner previous owner of this contract
     * @param newOwner new owner of this contract
     */
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev sets the original `owner` of the contract to the sender
     * at construction. Must then be reinitialized
     */
    constructor() public {
        owner = msg.sender;
        emit OwnershipTransferred(address(0), owner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner, "only Owner");
        _;
    }

    /**
     * @dev Modifier throws if called by any account other than the pendingOwner.
     */
    modifier onlyPendingOwner() {
        require(msg.sender == pendingOwner, "only pending owner");
        _;
    }

    /**
     * @dev Allows the current owner to set the pendingOwner address.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        pendingOwner = newOwner;
    }

    /**
     * @dev Allows the pendingOwner address to finalize the transfer.
     */
    function claimOwnership() public onlyPendingOwner {
        emit OwnershipTransferred(owner, pendingOwner);
        owner = pendingOwner;
        pendingOwner = address(0);
    }
}

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

pragma solidity ^0.6.0;

/**
 * @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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
/**
 * @notice This is a copy of openzeppelin ERC20 contract with removed state variables.
 * Removing state variables has been necessary due to proxy pattern usage.
 * Changes to Openzeppelin ERC20 https://github.com/OpenZeppelin/openzeppelin-contracts/blob/de99bccbfd4ecd19d7369d01b070aa72c64423c9/contracts/token/ERC20/ERC20.sol:
 * - Remove state variables _name, _symbol, _decimals
 * - Use state variables _balances, _allowances, _totalSupply from ProxyStorage
 * - Remove constructor
 * - Solidity version changed from ^0.6.0 to 0.6.10
 * - Contract made abstract
 *
 * See also: ClaimableOwnable.sol and ProxyStorage.sol
 */

pragma solidity 0.6.10;

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
abstract contract ERC20 is ClaimableOwnable, Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    /**
     * @dev Returns the name of the token.
     */
    function name() public virtual pure returns (string memory);

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public virtual pure returns (string memory);

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public virtual pure returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    // solhint-disable-next-line no-empty-blocks
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

pragma solidity 0.6.10;

/**
 * @title ReclaimerToken
 * @dev ERC20 token which allows owner to reclaim ERC20 tokens
 * or ether sent to this contract
 */
abstract contract ReclaimerToken is ERC20 {
    /**
     * @dev send all eth balance in the contract to another address
     * @param _to address to send eth balance to
     */
    function reclaimEther(address payable _to) external onlyOwner {
        _to.transfer(address(this).balance);
    }

    /**
     * @dev send all token balance of an arbitrary erc20 token
     * in the contract to another address
     * @param token token to reclaim
     * @param _to address to send eth balance to
     */
    function reclaimToken(IERC20 token, address _to) external onlyOwner {
        uint256 balance = token.balanceOf(address(this));
        token.transfer(_to, balance);
    }
}

pragma solidity 0.6.10;

/**
 * @title BurnableTokenWithBounds
 * @dev Burning functions as redeeming money from the system.
 * The platform will keep track of who burns coins,
 * and will send them back the equivalent amount of money (rounded down to the nearest cent).
 */
abstract contract BurnableTokenWithBounds is ReclaimerToken {
    /**
     * @dev Emitted when `value` tokens are burnt from one account (`burner`)
     * @param burner address which burned tokens
     * @param value amount of tokens burned
     */
    event Burn(address indexed burner, uint256 value);

    /**
     * @dev Emitted when new burn bounds were set
     * @param newMin new minimum burn amount
     * @param newMax new maximum burn amount
     * @notice `newMin` should never be greater than `newMax`
     */
    event SetBurnBounds(uint256 newMin, uint256 newMax);

    /**
     * @dev Destroys `amount` tokens from `msg.sender`, reducing the
     * total supply.
     * @param amount amount of tokens to burn
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     * Emits a {Burn} event with `burner` set to `msg.sender`
     *
     * Requirements
     *
     * - `msg.sender` must have at least `amount` tokens.
     *
     */
    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
    }

    /**
     * @dev Change the minimum and maximum amount that can be burned at once.
     * Burning may be disabled by setting both to 0 (this will not be done
     * under normal operation, but we can't add checks to disallow it without
     * losing a lot of flexibility since burning could also be as good as disabled
     * by setting the minimum extremely high, and we don't want to lock
     * in any particular cap for the minimum)
     * @param _min minimum amount that can be burned at once
     * @param _max maximum amount that can be burned at once
     */
    function setBurnBounds(uint256 _min, uint256 _max) external onlyOwner {
        require(_min <= _max, "BurnableTokenWithBounds: min > max");
        burnMin = _min;
        burnMax = _max;
        emit SetBurnBounds(_min, _max);
    }

    /**
     * @dev Checks if amount is within allowed burn bounds and
     * destroys `amount` tokens from `account`, reducing the
     * total supply.
     * @param account account to burn tokens for
     * @param amount amount of tokens to burn
     *
     * Emits a {Burn} event
     */
    function _burn(address account, uint256 amount) internal virtual override {
        require(amount >= burnMin, "BurnableTokenWithBounds: below min burn bound");
        require(amount <= burnMax, "BurnableTokenWithBounds: exceeds max burn bound");

        super._burn(account, amount);
        emit Burn(account, amount);
    }
}

pragma solidity 0.6.10;

/**
 * @title TrueCurrency
 * @dev TrueCurrency is an ERC20 with blacklist & redemption addresses
 *
 * TrueCurrency is a compliant stablecoin with blacklist and redemption
 * addresses. Only the owner can blacklist accounts. Redemption addresses
 * are assigned automatically to the first 0x100000 addresses. Sending
 * tokens to the redemption address will trigger a burn operation. Only
 * the owner can mint or blacklist accounts.
 *
 * This contract is owned by the TokenController, which manages token
 * minting & admin functionality. See TokenController.sol
 *
 * See also: BurnableTokenWithBounds.sol
 *
 * ~~~~ Features ~~~~
 *
 * Redemption Addresses
 * - The first 0x100000 addresses are redemption addresses
 * - Tokens sent to redemption addresses are burned
 * - Redemptions are tracked off-chain
 * - Cannot mint tokens to redemption addresses
 *
 * Blacklist
 * - Owner can blacklist accounts in accordance with local regulatory bodies
 * - Only a court order will merit a blacklist; blacklisting is extremely rare
 *
 * Burn Bounds & CanBurn
 * - Owner can set min & max burn amounts
 * - Only accounts flagged in canBurn are allowed to burn tokens
 * - canBurn prevents tokens from being sent to the incorrect address
 *
 * Reclaimer Token
 * - ERC20 Tokens and Ether sent to this contract can be reclaimed by the owner
 */
abstract contract TrueCurrency is BurnableTokenWithBounds {
    uint256 constant CENT = 10**16;
    uint256 constant REDEMPTION_ADDRESS_COUNT = 0x100000;

    /**
     * @dev Emitted when account blacklist status changes
     */
    event Blacklisted(address indexed account, bool isBlacklisted);

    /**
     * @dev Emitted when `value` tokens are minted for `to`
     * @param to address to mint tokens for
     * @param value amount of tokens to be minted
     */
    event Mint(address indexed to, uint256 value);

    /**
     * @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     * @param account address to mint tokens for
     * @param amount amount of tokens to be minted
     *
     * Emits a {Mint} event
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` cannot be blacklisted.
     * - `account` cannot be a redemption address.
     */
    function mint(address account, uint256 amount) external onlyOwner {
        require(!isBlacklisted[account], "TrueCurrency: account is blacklisted");
        require(!isRedemptionAddress(account), "TrueCurrency: account is a redemption address");
        _mint(account, amount);
        emit Mint(account, amount);
    }

    /**
     * @dev Set blacklisted status for the account.
     * @param account address to set blacklist flag for
     * @param _isBlacklisted blacklist flag value
     *
     * Requirements:
     *
     * - `msg.sender` should be owner.
     */
    function setBlacklisted(address account, bool _isBlacklisted) external onlyOwner {
        require(uint256(account) >= REDEMPTION_ADDRESS_COUNT, "TrueCurrency: blacklisting of redemption address is not allowed");
        isBlacklisted[account] = _isBlacklisted;
        emit Blacklisted(account, _isBlacklisted);
    }

    /**
     * @dev Set canBurn status for the account.
     * @param account address to set canBurn flag for
     * @param _canBurn canBurn flag value
     *
     * Requirements:
     *
     * - `msg.sender` should be owner.
     */
    function setCanBurn(address account, bool _canBurn) external onlyOwner {
        canBurn[account] = _canBurn;
    }

    /**
     * @dev Check if neither account is blacklisted before performing transfer
     * If transfer recipient is a redemption address, burns tokens
     * @notice Transfer to redemption address will burn tokens with a 1 cent precision
     * @param sender address of sender
     * @param recipient address of recipient
     * @param amount amount of tokens to transfer
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override {
        require(!isBlacklisted[sender], "TrueCurrency: sender is blacklisted");
        require(!isBlacklisted[recipient], "TrueCurrency: recipient is blacklisted");

        if (isRedemptionAddress(recipient)) {
            super._transfer(sender, recipient, amount.sub(amount.mod(CENT)));
            _burn(recipient, amount.sub(amount.mod(CENT)));
        } else {
            super._transfer(sender, recipient, amount);
        }
    }

    /**
     * @dev Requere neither accounts to be blacklisted before approval
     * @param owner address of owner giving approval
     * @param spender address of spender to approve for
     * @param amount amount of tokens to approve
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal override {
        require(!isBlacklisted[owner], "TrueCurrency: tokens owner is blacklisted");
        require(!isBlacklisted[spender] || amount == 0, "TrueCurrency: tokens spender is blacklisted");

        super._approve(owner, spender, amount);
    }

    /**
     * @dev Check if tokens can be burned at address before burning
     * @param account account to burn tokens from
     * @param amount amount of tokens to burn
     */
    function _burn(address account, uint256 amount) internal override {
        require(canBurn[account], "TrueCurrency: cannot burn from this address");
        super._burn(account, amount);
    }

    /**
     * @dev First 0x100000-1 addresses (0x0000000000000000000000000000000000000001 
     * to 0x00000000000000000000000000000000000fffff) are redemption addresses.
     * @param account address to check is a redemption address
     *
     * All transfers to redemption address will trigger token burn.
     *
     * @notice For transfer to succeed, canBurn must be true for redemption address
     *
     * @return is `account` a redemption address
     */
    function isRedemptionAddress(address account) internal pure returns (bool) {
        return uint256(account) < REDEMPTION_ADDRESS_COUNT && uint256(account) != 0;
    }
}

pragma solidity 0.6.10;

/**
 * @dev Contract that prevents addresses that were previously using autosweep addresses from
 * making transfers on them.
 *
 * In older versions TrueCurrencies had a feature called Autosweep.
 * Given a single deposit address, it was possible to generate 16^5-1 autosweep addresses.
 * E.g. having deposit address 0xc257274276a4e539741ca11b590b9447b26a8051, you could generate
 * - 0xc257274276a4e539741ca11b590b9447b2600000
 * - 0xc257274276a4e539741ca11b590b9447b2600001
 * - ...
 * - 0xc257274276a4e539741ca11b590b9447b26fffff
 * Every transfer to an autosweep address resulted as a transfer to deposit address.
 * This feature got deprecated, but there were 4 addresses that still actively using the feature.
 *
 * This contract will reject a transfer to these 4*(16^5-1) addresses to prevent accidental token freeze.
 */
abstract contract TrueCurrencyWithLegacyAutosweep is TrueCurrency {
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        requireNotAutosweepAddress(recipient, 0x33091DE8341533468D13A80C5A670f4f47cC649f);
        requireNotAutosweepAddress(recipient, 0x50E2719208914764087e68C32bC5AaC321f5B04d);
        requireNotAutosweepAddress(recipient, 0x71d69e5481A9B7Be515E20B38a3f62Dab7170D78);
        requireNotAutosweepAddress(recipient, 0x90fdaA85D52dB6065D466B86f16bF840D514a488);

        super._transfer(sender, recipient, amount);
    }

    /**
     * @dev return false if address is autosweep address
     * @param recipient transfer recipient
     * @param depositAddress address to deposit to
     */
    function requireNotAutosweepAddress(address recipient, address depositAddress) internal pure {
        return
            require(uint256(recipient) >> 20 != uint256(depositAddress) >> 20 || recipient == depositAddress, "Autosweep is disabled");
    }
}

pragma solidity 0.6.10;

/**
 * @title TrueUSD
 * @dev This is the top-level ERC20 contract, but most of the interesting functionality is
 * inherited - see the documentation on the corresponding contracts.
 */
contract TrueUSD is TrueCurrencyWithLegacyAutosweep {
    uint8 constant DECIMALS = 18;
    uint8 constant ROUNDING = 2;

    function decimals() public override pure returns (uint8) {
        return DECIMALS;
    }

    function rounding() public pure returns (uint8) {
        return ROUNDING;
    }

    function name() public override pure returns (string memory) {
        return "TrueUSD";
    }

    function symbol() public override pure returns (string memory) {
        return "TUSD";
    }
}

Contract Security Audit

Contract ABI

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payable","name":"_to","type":"address"}],"name":"reclaimEther","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract 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Swarm Source

ipfs://ce27777bf75635ead471d8ebf0fb12d10360a722a52bea36a641efbb6c0daf2a
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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