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Outline

• interface ValueIOUTokenInterface
•    - function transfer(address to, uint256 ...
•    - function transferFrom(
•    - function balanceOf(address who)
•    - function balanceOfUnderlying(address ...
•    - function allowance(address owner_, ad ...
•    - function approve(address spender, uin ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function maxScalingFactor()
•    - function valueIOUToFragment(uint256 v ...
•    - function fragmentToValueIOU(uint256 v ...
•    - function valueIOUsScalingFactor()
•    - function getScalingFactorBase()
•    - function mint(address to, uint256 amo ...
•    - function rebase(
•    - function setRebaser(address _rebaser)
•    - function setGovernance(address _gover ...
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(
•    - function mod(uint256 a, uint256 b)
•    - function mod(
•  contract ValueIOUTokenStorage
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(
• library Address
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(
•    - function functionCallWithValue(
•    - function functionCallWithValue(
•    - function _functionCallWithValue(
• library SafeERC20
•    - function safeTransfer(
•    - function safeTransferFrom(
•    - function safeApprove(
•    - function safeIncreaseAllowance(
•    - function safeDecreaseAllowance(
•    - function _callOptionalReturn(IERC20 t ...
•  contract ValueIOUToken is ValueIOU ...
•    - function initialize(
•    - function valueIOUsScalingFactor()
•    - function maxScalingFactor()
•    - function _maxScalingFactor()
•    - function mint(address to, uint256 amo ...
•    - function _mint(address to, uint256 am ...
•    - function transfer(address to, uint256 ...
•    - function transferFrom(
•    - function balanceOf(address who)
•    - function balanceOfUnderlying(address ...
•    - function allowance(address owner_, ad ...
•    - function approve(address spender, uin ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function permit(
•    - function setRebaser(address _rebaser)
•    - function setGovernance(address _gover ...
•    - function rebase(
•    - function valueIOUToFragment(uint256 v ...
•    - function fragmentToValueIOU(uint256 v ...
•    - function _valueIOUToFragment(uint256 ...
•    - function _fragmentToValueIOU(uint256 ...
•    - function rescueTokens(
•    - function getChainId()
•    - function getScalingFactorBase()
•  contract vBond is ValueIOUToken *
•    - function initialize(

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/**
 *Submitted for verification at Etherscan.io on 2020-12-11
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface ValueIOUTokenInterface {
    /**
     * @notice Event emitted when tokens are rebased
     */
    event Rebase(uint256 epoch, uint256 prevValueIOUsScalingFactor, uint256 newValueIOUsScalingFactor);

    /*** Gov Events ***/

    /**
     * @notice Event emitted when gov is changed
     */
    event NewGov(address oldGov, address newGov);

    /**
     * @notice Sets the rebaser contract
     */
    event NewRebaser(address oldRebaser, address newRebaser);

    /**
     * @notice Sets the migrator contract
     */
    event NewMigrator(address oldMigrator, address newMigrator);

    /* - ERC20 Events - */

    /**
     * @notice EIP20 Transfer event
     */
    event Transfer(address indexed from, address indexed to, uint256 amount);

    /**
     * @notice EIP20 Approval event
     */
    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /* - Extra Events - */
    /**
     * @notice Tokens minted event
     */
    event Mint(address to, uint256 amount);

    // Public functions
    function transfer(address to, uint256 value) external returns (bool);

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

    function balanceOf(address who) external view returns (uint256);

    function balanceOfUnderlying(address who) external view returns (uint256);

    function allowance(address owner_, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);

    function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

    function maxScalingFactor() external view returns (uint256);

    function valueIOUToFragment(uint256 valueIOU) external view returns (uint256);

    function fragmentToValueIOU(uint256 value) external view returns (uint256);

    function valueIOUsScalingFactor() external view returns (uint256);

    function getScalingFactorBase() external view returns (uint256);

    /* - Permissioned/Governance functions - */
    function mint(address to, uint256 amount) external returns (bool);

    function rebase(
        uint256 epoch,
        uint256 indexDelta,
        bool positive
    ) external returns (uint256);

    function setRebaser(address _rebaser) external;

    function setGovernance(address _governance) external;
}

/**
 * @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;
    }
}

// Storage for a ValueIOU token
contract ValueIOUTokenStorage {
    using SafeMath for uint256;

    /**
     * @dev Guard variable for re-entrancy checks. Not currently used
     */
    bool internal _notEntered;

    /**
     * @notice EIP-20 token name for this token
     */
    string public name;

    /**
     * @notice EIP-20 token symbol for this token
     */
    string public symbol;

    /**
     * @notice EIP-20 token decimals for this token
     */
    uint8 public decimals;

    /**
     * @notice Governor for this contract
     */
    address public gov;

    /**
     * @notice Approved rebaser for this contract
     */
    address public rebaser;

    /**
     * @notice Total supply of ValueIOUs
     */
    uint256 public totalSupply;

    /**
     * @notice Internal decimals used to handle scaling factor
     */
    uint256 public constant internalDecimals = 10**24;

    /**
     * @notice Used for percentage maths
     */
    uint256 public constant BASE = 10**18;

    // init 95k
    uint256 internal constant INIT_SUPPLY = 95000 * 10**18;

    /**
     * @dev @notice Scaling factor that adjusts everyone's balances
     */
    uint256 internal valueIOUsScalingFactor_;

    mapping(address => uint256) internal _valueIOUBalances;

    mapping(address => mapping(address => uint256)) internal _allowedFragments;

    uint256 public initSupply;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    bytes32 public DOMAIN_SEPARATOR;

    /// @notice A record of states for signing / validating signatures
    mapping(address => uint256) public nonces;
}

/**
 * @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);
}

/**
 * @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) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @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);
            }
        }
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract ValueIOUToken is ValueIOUTokenInterface, ValueIOUTokenStorage {
    // Modifiers
    modifier onlyGov() {
        require(msg.sender == gov);
        _;
    }

    modifier onlyRebaser() {
        require(msg.sender == rebaser);
        _;
    }

    modifier onlyMinter() {
        require(msg.sender == rebaser || msg.sender == gov, "not minter");
        _;
    }

    modifier validRecipient(address to) {
        require(to != address(0x0));
        require(to != address(this));
        _;
    }

    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) public virtual {
        require(valueIOUsScalingFactor_ == 0, "already initialized");
        name = name_;
        symbol = symbol_;
        decimals = decimals_;
    }

    function valueIOUsScalingFactor() external view override returns (uint256) {
        return valueIOUsScalingFactor_;
    }

    /**
     * @notice Computes the current max scaling factor
     */
    function maxScalingFactor() external view override returns (uint256) {
        return _maxScalingFactor();
    }

    function _maxScalingFactor() internal view returns (uint256) {
        // scaling factor can only go up to 2**256-1 = initSupply * valueIOUsScalingFactor_
        // this is used to check if valueIOUsScalingFactor_ will be too high to compute balances when rebasing.
        return uint256(-1) / initSupply;
    }

    /**
     * @notice Mints new tokens, increasing totalSupply, initSupply, and a users balance.
     * @dev Limited to onlyMinter modifier
     */
    function mint(address to, uint256 amount) external override onlyMinter returns (bool) {
        _mint(to, amount);
        return true;
    }

    function _mint(address to, uint256 amount) internal {
        // increase totalSupply
        totalSupply = totalSupply.add(amount);

        // get underlying value
        uint256 valueIOUValue = _fragmentToValueIOU(amount);

        // increase initSupply
        initSupply = initSupply.add(valueIOUValue);

        // make sure the mint didnt push maxScalingFactor too low
        require(valueIOUsScalingFactor_ <= _maxScalingFactor(), "max scaling factor too low");

        // add balance
        _valueIOUBalances[to] = _valueIOUBalances[to].add(valueIOUValue);

        // add delegates to the minter
        emit Mint(to, amount);
    }

    /* - ERC20 functionality - */

    /**
     * @dev Transfer tokens to a specified address.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @return True on success, false otherwise.
     */
    function transfer(address to, uint256 value) external override validRecipient(to) returns (bool) {
        // underlying balance is stored in valueIOUs, so divide by current scaling factor

        // note, this means as scaling factor grows, dust will be untransferrable.
        // minimum transfer value == valueIOUsScalingFactor_ / 1e24;

        // get amount in underlying
        uint256 valueIOUValue = _fragmentToValueIOU(value);

        // sub from balance of sender
        _valueIOUBalances[msg.sender] = _valueIOUBalances[msg.sender].sub(valueIOUValue);

        // add to balance of receiver
        _valueIOUBalances[to] = _valueIOUBalances[to].add(valueIOUValue);
        emit Transfer(msg.sender, to, value);

        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * @param from The address you want to send tokens from.
     * @param to The address you want to transfer to.
     * @param value The amount of tokens to be transferred.
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external override validRecipient(to) returns (bool) {
        // decrease allowance
        _allowedFragments[from][msg.sender] = _allowedFragments[from][msg.sender].sub(value);

        // get value in valueIOUs
        uint256 valueIOUValue = _fragmentToValueIOU(value);

        // sub from from
        _valueIOUBalances[from] = _valueIOUBalances[from].sub(valueIOUValue);
        _valueIOUBalances[to] = _valueIOUBalances[to].add(valueIOUValue);
        emit Transfer(from, to, value);
        return true;
    }

    /**
     * @param who The address to query.
     * @return The balance of the specified address.
     */
    function balanceOf(address who) external view override returns (uint256) {
        return _valueIOUToFragment(_valueIOUBalances[who]);
    }

    /** @notice Currently returns the internal storage amount
     * @param who The address to query.
     * @return The underlying balance of the specified address.
     */
    function balanceOfUnderlying(address who) external view override returns (uint256) {
        return _valueIOUBalances[who];
    }

    /**
     * @dev Function to check the amount of tokens that an owner has allowed to a spender.
     * @param owner_ The address which owns the funds.
     * @param spender The address which will spend the funds.
     * @return The number of tokens still available for the spender.
     */
    function allowance(address owner_, address spender) external view override returns (uint256) {
        return _allowedFragments[owner_][spender];
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of
     * msg.sender. This method is included for ERC20 compatibility.
     * increaseAllowance and decreaseAllowance should be used instead.
     * Changing an allowance with this method brings the risk that someone may transfer both
     * the old and the new allowance - if they are both greater than zero - if a transfer
     * transaction is mined before the later approve() call is mined.
     *
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) external override returns (bool) {
        _allowedFragments[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner has allowed to a spender.
     * This method should be used instead of approve() to avoid the double approval vulnerability
     * described above.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) external override returns (bool) {
        _allowedFragments[msg.sender][spender] = _allowedFragments[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner has allowed to a spender.
     *
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) external override returns (bool) {
        uint256 oldValue = _allowedFragments[msg.sender][spender];
        if (subtractedValue >= oldValue) {
            _allowedFragments[msg.sender][spender] = 0;
        } else {
            _allowedFragments[msg.sender][spender] = oldValue.sub(subtractedValue);
        }
        emit Approval(msg.sender, spender, _allowedFragments[msg.sender][spender]);
        return true;
    }

    // --- Approve by signature ---
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(now <= deadline, "permit-expired");

        bytes32 digest =
            keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))));

        require(owner != address(0), "invalid-address-0");
        require(owner == ecrecover(digest, v, r, s), "invalid-permit");
        _allowedFragments[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /* - Governance Functions - */

    /** @notice sets the rebaser
     * @param _rebaser The address of the rebaser contract to use for authentication.
     */
    function setRebaser(address _rebaser) external override onlyGov {
        address oldRebaser = rebaser;
        rebaser = _rebaser;
        emit NewRebaser(oldRebaser, _rebaser);
    }

    function setGovernance(address _governance) external override onlyGov {
        address oldGov = gov;
        gov = _governance;
        emit NewGov(oldGov, _governance);
    }

    /* - Extras - */

    /**
     * @notice Initiates a new rebase operation, provided the minimum time period has elapsed.
     */
    function rebase(
        uint256 epoch,
        uint256 indexDelta,
        bool positive
    ) external override onlyRebaser returns (uint256) {
        // no change
        if (indexDelta == 0) {
            emit Rebase(epoch, valueIOUsScalingFactor_, valueIOUsScalingFactor_);
            return totalSupply;
        }

        // for events
        uint256 prevValueIOUsScalingFactor = valueIOUsScalingFactor_;

        if (!positive) {
            // negative rebase, decrease scaling factor
            valueIOUsScalingFactor_ = valueIOUsScalingFactor_.mul(BASE.sub(indexDelta)).div(BASE);
        } else {
            // positive reabse, increase scaling factor
            uint256 newScalingFactor = valueIOUsScalingFactor_.mul(BASE.add(indexDelta)).div(BASE);
            if (newScalingFactor < _maxScalingFactor()) {
                valueIOUsScalingFactor_ = newScalingFactor;
            } else {
                valueIOUsScalingFactor_ = _maxScalingFactor();
            }
        }

        // update total supply, correctly
        totalSupply = _valueIOUToFragment(initSupply);

        emit Rebase(epoch, prevValueIOUsScalingFactor, valueIOUsScalingFactor_);
        return totalSupply;
    }

    function valueIOUToFragment(uint256 valueIOU) external view override returns (uint256) {
        return _valueIOUToFragment(valueIOU);
    }

    function fragmentToValueIOU(uint256 value) external view override returns (uint256) {
        return _fragmentToValueIOU(value);
    }

    function _valueIOUToFragment(uint256 valueIOU) internal view returns (uint256) {
        return valueIOU.mul(valueIOUsScalingFactor_).div(internalDecimals);
    }

    function _fragmentToValueIOU(uint256 value) internal view returns (uint256) {
        return value.mul(internalDecimals).div(valueIOUsScalingFactor_);
    }

    // Rescue tokens
    function rescueTokens(
        address token,
        address to,
        uint256 amount
    ) external onlyGov returns (bool) {
        // transfer to
        SafeERC20.safeTransfer(IERC20(token), to, amount);
        return true;
    }

    function getChainId() internal pure returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }

    function getScalingFactorBase() external view override returns (uint256) {
        return BASE;
    }
}

contract vBond is ValueIOUToken {
    /**
     * @notice Initialize the new money market
     * @param name_ ERC-20 name of this token
     * @param symbol_ ERC-20 symbol of this token
     * @param decimals_ ERC-20 decimal precision of this token
     */
    function initialize(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) public override {
        super.initialize(name_, symbol_, decimals_);
        valueIOUsScalingFactor_ = BASE;
        initSupply = _fragmentToValueIOU(INIT_SUPPLY);
        totalSupply = INIT_SUPPLY;
        _valueIOUBalances[msg.sender] = initSupply;

        DOMAIN_SEPARATOR = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), getChainId(), address(this)));

        gov = msg.sender;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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eMutability":"view","type":"function"},{"inputs":[],"name":"maxScalingFactor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"epoch","type":"uint256"},{"internalType":"uint256","name":"indexDelta","type":"uint256"},{"internalType":"bool","name":"positive","type":"bool"}],"name":"rebase","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rebaser","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueTokens","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_governance","type":"address"}],"name":"setGovernance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_rebaser","type":"address"}],"name":"setRebaser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"valueIOU","type":"uint256"}],"name":"valueIOUToFragment","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"valueIOUsScalingFactor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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