// File: contracts/zeppelin/Proxy.sol

pragma solidity 0.4.24;

/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
contract Proxy {
    /**
     * @dev Fallback function.
     * Implemented entirely in `_fallback`.
     */
    function () payable external {
        _fallback();
    }

    /**
     * @return The Address of the implementation.
     */
    function _implementation() internal view returns (address);

    /**
     * @dev Delegates execution to an implementation contract.
     * This is a low level function that doesn't return to its internal call site.
     * It will return to the external caller whatever the implementation returns.
     * @param implementation Address to delegate.
     */
    function _delegate(address implementation) internal {
        assembly {
        // Copy msg.data. We take full control of memory in this inline assembly
        // block because it will not return to Solidity code. We overwrite the
        // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize)

        // Call the implementation.
        // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

        // Copy the returned data.
            returndatacopy(0, 0, returndatasize)

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize) }
            default { return(0, returndatasize) }
        }
    }

    /**
     * @dev Function that is run as the first thing in the fallback function.
     * Can be redefined in derived contracts to add functionality.
     * Redefinitions must call super._willFallback().
     */
    function _willFallback() internal {
    }

    /**
     * @dev fallback implementation.
     * Extracted to enable manual triggering.
     */
    function _fallback() internal {
        _willFallback();
        _delegate(_implementation());
    }
}

// File: contracts/zeppelin/AddressUtils.sol

pragma solidity 0.4.24;


/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param addr address to check
     * @return whether the target address is a contract
     */
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solium-disable-next-line security/no-inline-assembly
        assembly { size := extcodesize(addr) }
        return size > 0;
    }

}

// File: contracts/zeppelin/UpgradeabilityProxy.sol

pragma solidity 0.4.24;



/**
 * @title UpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeabilityProxy is Proxy {
    /**
     * @dev Emitted when the implementation is upgraded.
     * @param implementation Address of the new implementation.
     */
    event Upgraded(address implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
     * validated in the constructor.
     */
    bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;

    /**
     * @dev Contract constructor.
     * @param _implementation Address of the initial implementation.
     */
    constructor(address _implementation) public {
        assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));

        _setImplementation(_implementation);
    }

    /**
     * @dev Returns the current implementation.
     * @return Address of the current implementation
     */
    function _implementation() internal view returns (address impl) {
        bytes32 slot = IMPLEMENTATION_SLOT;
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     * @param newImplementation Address of the new implementation.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Sets the implementation address of the proxy.
     * @param newImplementation Address of the new implementation.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

        bytes32 slot = IMPLEMENTATION_SLOT;

        assembly {
            sstore(slot, newImplementation)
        }
    }
}

// File: contracts/zeppelin/AdminUpgradeabilityProxy.sol

pragma solidity 0.4.24;


/**
 * @title AdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
    /**
     * @dev Emitted when the administration has been transferred.
     * @param previousAdmin Address of the previous admin.
     * @param newAdmin Address of the new admin.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
     * validated in the constructor.
     */
    bytes32 private constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;

    /**
     * @dev Modifier to check whether the `msg.sender` is the admin.
     * If it is, it will run the function. Otherwise, it will delegate the call
     * to the implementation.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * Contract constructor.
     * It sets the `msg.sender` as the proxy administrator.
     * @param _implementation address of the initial implementation.
     */
    constructor(address _implementation) UpgradeabilityProxy(_implementation) public {
        assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));

        _setAdmin(msg.sender);
    }

    /**
     * @return The address of the proxy admin.
     */
    function admin() external view ifAdmin returns (address) {
        return _admin();
    }

    /**
     * @return The address of the implementation.
     */
    function implementation() external view ifAdmin returns (address) {
        return _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     * Only the current admin can call this function.
     * @param newAdmin Address to transfer proxy administration to.
     */
    function changeAdmin(address newAdmin) external ifAdmin {
        require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the backing implementation of the proxy.
     * Only the admin can call this function.
     * @param newImplementation Address of the new implementation.
     */
    function upgradeTo(address newImplementation) external ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the backing implementation of the proxy and call a function
     * on the new implementation.
     * This is useful to initialize the proxied contract.
     * @param newImplementation Address of the new implementation.
     * @param data Data to send as msg.data in the low level call.
     * It should include the signature and the parameters of the function to be
     * called, as described in
     * https://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector-and-argument-encoding.
     */
    function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin {
        _upgradeTo(newImplementation);
        require(address(this).call.value(msg.value)(data));
    }

    /**
     * @return The admin slot.
     */
    function _admin() internal view returns (address adm) {
        bytes32 slot = ADMIN_SLOT;
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Sets the address of the proxy admin.
     * @param newAdmin Address of the new proxy admin.
     */
    function _setAdmin(address newAdmin) internal {
        bytes32 slot = ADMIN_SLOT;

        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Only fall back when the sender is not the admin.
     */
    function _willFallback() internal {
        require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
        super._willFallback();
    }
}

// File: contracts/zeppelin/SafeMath.sol

pragma solidity 0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    /**
    * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
    * @dev Adds two numbers, reverts on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }
}

// File: contracts/BUSDImplementation.sol

pragma solidity 0.4.24;
pragma experimental "v0.5.0";



/**
 * @title BUSDImplementation
 * @dev this contract is a Pausable ERC20 token with Burn and Mint
 * controlled by a central SupplyController. By implementing BUSDImplementation
 * this contract also includes external methods for setting
 * a new implementation contract for the Proxy.
 * NOTE: The storage defined here will actually be held in the Proxy
 * contract and all calls to this contract should be made through
 * the proxy, including admin actions done as owner or supplyController.
 * Any call to transfer against this contract should fail
 * with insufficient funds since no tokens will be issued there.
 */
contract BUSDImplementation {

    /**
     * MATH
     */

    using SafeMath for uint256;

    /**
     * DATA
     */

    // INITIALIZATION DATA
    bool private initialized = false;

    // ERC20 BASIC DATA
    mapping(address => uint256) internal balances;
    uint256 internal totalSupply_;
    string public constant name = "Binance USD"; // solium-disable-line
    string public constant symbol = "BUSD"; // solium-disable-line uppercase
    uint8 public constant decimals = 18; // solium-disable-line uppercase

    // ERC20 DATA
    mapping(address => mapping(address => uint256)) internal allowed;

    // OWNER DATA
    address public owner;
    address public proposedOwner;

    // PAUSABILITY DATA
    bool public paused = false;

    // ASSET PROTECTION DATA
    address public assetProtectionRole;
    mapping(address => bool) internal frozen;

    // SUPPLY CONTROL DATA
    address public supplyController;

    // DELEGATED TRANSFER DATA
    address public betaDelegateWhitelister;
    mapping(address => bool) internal betaDelegateWhitelist;
    mapping(address => uint256) internal nextSeqs;
    // EIP191 header for EIP712 prefix
    string constant internal EIP191_HEADER = "\x19\x01";
    // Hash of the EIP712 Domain Separator Schema
    bytes32 constant internal EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(
        "EIP712Domain(string name,address verifyingContract)"
    );
    bytes32 constant internal EIP712_DELEGATED_TRANSFER_SCHEMA_HASH = keccak256(
        "BetaDelegatedTransfer(address to,uint256 value,uint256 fee,uint256 seq,uint256 deadline)"
    );
    // Hash of the EIP712 Domain Separator data
    // solhint-disable-next-line var-name-mixedcase
    bytes32 public EIP712_DOMAIN_HASH;

    /**
     * EVENTS
     */

    // ERC20 BASIC EVENTS
    event Transfer(address indexed from, address indexed to, uint256 value);

    // ERC20 EVENTS
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );

    // OWNABLE EVENTS
    event OwnershipTransferProposed(
        address indexed currentOwner,
        address indexed proposedOwner
    );
    event OwnershipTransferDisregarded(
        address indexed oldProposedOwner
    );
    event OwnershipTransferred(
        address indexed oldOwner,
        address indexed newOwner
    );

    // PAUSABLE EVENTS
    event Pause();
    event Unpause();

    // ASSET PROTECTION EVENTS
    event AddressFrozen(address indexed addr);
    event AddressUnfrozen(address indexed addr);
    event FrozenAddressWiped(address indexed addr);
    event AssetProtectionRoleSet (
        address indexed oldAssetProtectionRole,
        address indexed newAssetProtectionRole
    );

    // SUPPLY CONTROL EVENTS
    event SupplyIncreased(address indexed to, uint256 value);
    event SupplyDecreased(address indexed from, uint256 value);
    event SupplyControllerSet(
        address indexed oldSupplyController,
        address indexed newSupplyController
    );

    // DELEGATED TRANSFER EVENTS
    event BetaDelegatedTransfer(
        address indexed from, address indexed to, uint256 value, uint256 seq, uint256 fee
    );
    event BetaDelegateWhitelisterSet(
        address indexed oldWhitelister,
        address indexed newWhitelister
    );
    event BetaDelegateWhitelisted(address indexed newDelegate);
    event BetaDelegateUnwhitelisted(address indexed oldDelegate);

    /**
     * FUNCTIONALITY
     */

    // INITIALIZATION FUNCTIONALITY

    /**
     * @dev sets 0 initials tokens, the owner, and the supplyController.
     * this serves as the constructor for the proxy but compiles to the
     * memory model of the Implementation contract.
     */
    function initialize() public {
        require(!initialized, "already initialized");
        owner = msg.sender;
        proposedOwner = address(0);
        assetProtectionRole = address(0);
        totalSupply_ = 0;
        supplyController = msg.sender;
        initialized = true;
    }

    /**
     * The constructor is used here to ensure that the implementation
     * contract is initialized. An uncontrolled implementation
     * contract might lead to misleading state
     * for users who accidentally interact with it.
     */
    constructor() public {
        initialize();
        pause();
        // Added in V2
        initializeDomainSeparator();
    }

    /**
     * @dev To be called when upgrading the contract using upgradeAndCall to add delegated transfers
     */
    function initializeDomainSeparator() public {
        // hash the name context with the contract address
        EIP712_DOMAIN_HASH = keccak256(abi.encodePacked(// solium-disable-line
                EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
                keccak256(bytes(name)),
                bytes32(address(this))
            ));
    }

    // ERC20 BASIC FUNCTIONALITY

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Transfer token to a specified address from msg.sender
    * Note: the use of Safemath ensures that _value is nonnegative.
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
        require(_to != address(0), "cannot transfer to address zero");
        require(!frozen[_to] && !frozen[msg.sender], "address frozen");
        require(_value <= balances[msg.sender], "insufficient funds");

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _addr The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _addr) public view returns (uint256) {
        return balances[_addr];
    }

    // ERC20 FUNCTIONALITY

    /**
     * @dev Transfer tokens from one address to another
     * @param _from address The address which you want to send tokens from
     * @param _to address The address which you want to transfer to
     * @param _value uint256 the amount of tokens to be transferred
     */
    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
    public
    whenNotPaused
    returns (bool)
    {
        require(_to != address(0), "cannot transfer to address zero");
        require(!frozen[_to] && !frozen[_from] && !frozen[msg.sender], "address frozen");
        require(_value <= balances[_from], "insufficient funds");
        require(_value <= allowed[_from][msg.sender], "insufficient allowance");

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * 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
     * @param _spender The address which will spend the funds.
     * @param _value The amount of tokens to be spent.
     */
    function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
        require(!frozen[_spender] && !frozen[msg.sender], "address frozen");
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param _owner address The address which owns the funds.
     * @param _spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(
        address _owner,
        address _spender
    )
    public
    view
    returns (uint256)
    {
        return allowed[_owner][_spender];
    }

    // OWNER FUNCTIONALITY

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

    /**
     * @dev Allows the current owner to begin transferring control of the contract to a proposedOwner
     * @param _proposedOwner The address to transfer ownership to.
     */
    function proposeOwner(address _proposedOwner) public onlyOwner {
        require(_proposedOwner != address(0), "cannot transfer ownership to address zero");
        require(msg.sender != _proposedOwner, "caller already is owner");
        proposedOwner = _proposedOwner;
        emit OwnershipTransferProposed(owner, proposedOwner);
    }

    /**
     * @dev Allows the current owner or proposed owner to cancel transferring control of the contract to a proposedOwner
     */
    function disregardProposeOwner() public {
        require(msg.sender == proposedOwner || msg.sender == owner, "only proposedOwner or owner");
        require(proposedOwner != address(0), "can only disregard a proposed owner that was previously set");
        address _oldProposedOwner = proposedOwner;
        proposedOwner = address(0);
        emit OwnershipTransferDisregarded(_oldProposedOwner);
    }

    /**
     * @dev Allows the proposed owner to complete transferring control of the contract to the proposedOwner.
     */
    function claimOwnership() public {
        require(msg.sender == proposedOwner, "onlyProposedOwner");
        address _oldOwner = owner;
        owner = proposedOwner;
        proposedOwner = address(0);
        emit OwnershipTransferred(_oldOwner, owner);
    }

    /**
     * @dev Reclaim all BUSD at the contract address.
     * This sends the BUSD tokens that this contract add holding to the owner.
     * Note: this is not affected by freeze constraints.
     */
    function reclaimBUSD() external onlyOwner {
        uint256 _balance = balances[this];
        balances[this] = 0;
        balances[owner] = balances[owner].add(_balance);
        emit Transfer(this, owner, _balance);
    }

    // PAUSABILITY FUNCTIONALITY

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!paused, "whenNotPaused");
        _;
    }

    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() public onlyOwner {
        require(!paused, "already paused");
        paused = true;
        emit Pause();
    }

    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() public onlyOwner {
        require(paused, "already unpaused");
        paused = false;
        emit Unpause();
    }

    // ASSET PROTECTION FUNCTIONALITY

    /**
     * @dev Sets a new asset Protection role address.
     * @param _newAssetProtectionRole The new address allowed to freeze/unfreeze addresses and seize their tokens.
     */
    function setAssetProtectionRole(address _newAssetProtectionRole) public {
        require(msg.sender == assetProtectionRole || msg.sender == owner, "only assetProtectionRole or Owner");
        emit AssetProtectionRoleSet(assetProtectionRole, _newAssetProtectionRole);
        assetProtectionRole = _newAssetProtectionRole;
    }

    modifier onlyAssetProtectionRole() {
        require(msg.sender == assetProtectionRole, "onlyAssetProtectionRole");
        _;
    }

    /**
     * @dev Freezes an address balance from being transferred.
     * @param _addr The new address to freeze.
     */
    function freeze(address _addr) public onlyAssetProtectionRole {
        require(!frozen[_addr], "address already frozen");
        frozen[_addr] = true;
        emit AddressFrozen(_addr);
    }

    /**
     * @dev Unfreezes an address balance allowing transfer.
     * @param _addr The new address to unfreeze.
     */
    function unfreeze(address _addr) public onlyAssetProtectionRole {
        require(frozen[_addr], "address already unfrozen");
        frozen[_addr] = false;
        emit AddressUnfrozen(_addr);
    }

    /**
     * @dev Wipes the balance of a frozen address, burning the tokens
     * and setting the approval to zero.
     * @param _addr The new frozen address to wipe.
     */
    function wipeFrozenAddress(address _addr) public onlyAssetProtectionRole {
        require(frozen[_addr], "address is not frozen");
        uint256 _balance = balances[_addr];
        balances[_addr] = 0;
        totalSupply_ = totalSupply_.sub(_balance);
        emit FrozenAddressWiped(_addr);
        emit SupplyDecreased(_addr, _balance);
        emit Transfer(_addr, address(0), _balance);
    }

    /**
    * @dev Gets whether the address is currently frozen.
    * @param _addr The address to check if frozen.
    * @return A bool representing whether the given address is frozen.
    */
    function isFrozen(address _addr) public view returns (bool) {
        return frozen[_addr];
    }

    // SUPPLY CONTROL FUNCTIONALITY

    /**
     * @dev Sets a new supply controller address.
     * @param _newSupplyController The address allowed to burn/mint tokens to control supply.
     */
    function setSupplyController(address _newSupplyController) public {
        require(msg.sender == supplyController || msg.sender == owner, "only SupplyController or Owner");
        require(_newSupplyController != address(0), "cannot set supply controller to address zero");
        emit SupplyControllerSet(supplyController, _newSupplyController);
        supplyController = _newSupplyController;
    }

    modifier onlySupplyController() {
        require(msg.sender == supplyController, "onlySupplyController");
        _;
    }

    /**
     * @dev Increases the total supply by minting the specified number of tokens to the supply controller account.
     * @param _value The number of tokens to add.
     * @return A boolean that indicates if the operation was successful.
     */
    function increaseSupply(uint256 _value) public onlySupplyController returns (bool success) {
        totalSupply_ = totalSupply_.add(_value);
        balances[supplyController] = balances[supplyController].add(_value);
        emit SupplyIncreased(supplyController, _value);
        emit Transfer(address(0), supplyController, _value);
        return true;
    }

    /**
     * @dev Decreases the total supply by burning the specified number of tokens from the supply controller account.
     * @param _value The number of tokens to remove.
     * @return A boolean that indicates if the operation was successful.
     */
    function decreaseSupply(uint256 _value) public onlySupplyController returns (bool success) {
        require(_value <= balances[supplyController], "not enough supply");
        balances[supplyController] = balances[supplyController].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit SupplyDecreased(supplyController, _value);
        emit Transfer(supplyController, address(0), _value);
        return true;
    }

    // DELEGATED TRANSFER FUNCTIONALITY

    /**
     * @dev returns the next seq for a target address.
     * The transactor must submit nextSeqOf(transactor) in the next transaction for it to be valid.
     * Note: that the seq context is specific to this smart contract.
     * @param target The target address.
     * @return the seq.
     */
    //
    function nextSeqOf(address target) public view returns (uint256) {
        return nextSeqs[target];
    }

    /**
     * @dev Performs a transfer on behalf of the from address, identified by its signature on the delegatedTransfer msg.
     * Splits a signature byte array into r,s,v for convenience.
     * @param sig the signature of the delgatedTransfer msg.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @param fee an optional ERC20 fee paid to the executor of betaDelegatedTransfer by the from address.
     * @param seq a sequencing number included by the from address specific to this contract to protect from replays.
     * @param deadline a block number after which the pre-signed transaction has expired.
     * @return A boolean that indicates if the operation was successful.
     */
    function betaDelegatedTransfer(
        bytes sig, address to, uint256 value, uint256 fee, uint256 seq, uint256 deadline
    ) public returns (bool) {
        require(sig.length == 65, "signature should have length 65");
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            r := mload(add(sig, 32))
            s := mload(add(sig, 64))
            v := byte(0, mload(add(sig, 96)))
        }
        require(_betaDelegatedTransfer(r, s, v, to, value, fee, seq, deadline), "failed transfer");
        return true;
    }

    /**
     * @dev Performs a transfer on behalf of the from address, identified by its signature on the betaDelegatedTransfer msg.
     * Note: both the delegate and transactor sign in the fees. The transactor, however,
     * has no control over the gas price, and therefore no control over the transaction time.
     * Beta prefix chosen to avoid a name clash with an emerging standard in ERC865 or elsewhere.
     * Internal to the contract - see betaDelegatedTransfer and betaDelegatedTransferBatch.
     * @param r the r signature of the delgatedTransfer msg.
     * @param s the s signature of the delgatedTransfer msg.
     * @param v the v signature of the delgatedTransfer msg.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     * @param fee an optional ERC20 fee paid to the delegate of betaDelegatedTransfer by the from address.
     * @param seq a sequencing number included by the from address specific to this contract to protect from replays.
     * @param deadline a block number after which the pre-signed transaction has expired.
     * @return A boolean that indicates if the operation was successful.
     */
    function _betaDelegatedTransfer(
        bytes32 r, bytes32 s, uint8 v, address to, uint256 value, uint256 fee, uint256 seq, uint256 deadline
    ) internal whenNotPaused returns (bool) {
        require(betaDelegateWhitelist[msg.sender], "Beta feature only accepts whitelisted delegates");
        require(value > 0 || fee > 0, "cannot transfer zero tokens with zero fee");
        require(block.number <= deadline, "transaction expired");
        // prevent sig malleability from ecrecover()
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "signature incorrect");
        require(v == 27 || v == 28, "signature incorrect");

        // EIP712 scheme: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-712.md
        bytes32 delegatedTransferHash = keccak256(abi.encodePacked(// solium-disable-line
                EIP712_DELEGATED_TRANSFER_SCHEMA_HASH, bytes32(to), value, fee, seq, deadline
            ));
        bytes32 hash = keccak256(abi.encodePacked(EIP191_HEADER, EIP712_DOMAIN_HASH, delegatedTransferHash));
        address _from = ecrecover(hash, v, r, s);

        require(_from != address(0), "error determining from address from signature");
        require(to != address(0), "canno use address zero");
        require(!frozen[to] && !frozen[_from] && !frozen[msg.sender], "address frozen");
        require(value.add(fee) <= balances[_from], "insufficent fund");
        require(nextSeqs[_from] == seq, "incorrect seq");

        nextSeqs[_from] = nextSeqs[_from].add(1);
        balances[_from] = balances[_from].sub(value.add(fee));

        if (fee != 0) {
            balances[msg.sender] = balances[msg.sender].add(fee);
            emit Transfer(_from, msg.sender, fee);
        }

        balances[to] = balances[to].add(value);
        emit Transfer(_from, to, value);

        emit BetaDelegatedTransfer(_from, to, value, seq, fee);
        return true;
    }

    /**
     * @dev Performs an atomic batch of transfers on behalf of the from addresses, identified by their signatures.
     * Lack of nested array support in arguments requires all arguments to be passed as equal size arrays where
     * delegated transfer number i is the combination of all arguments at index i
     * @param r the r signatures of the delgatedTransfer msg.
     * @param s the s signatures of the delgatedTransfer msg.
     * @param v the v signatures of the delgatedTransfer msg.
     * @param to The addresses to transfer to.
     * @param value The amounts to be transferred.
     * @param fee optional ERC20 fees paid to the delegate of betaDelegatedTransfer by the from address.
     * @param seq sequencing numbers included by the from address specific to this contract to protect from replays.
     * @param deadline block numbers after which the pre-signed transactions have expired.
     * @return A boolean that indicates if the operation was successful.
     */
    function betaDelegatedTransferBatch(
        bytes32[] r, bytes32[] s, uint8[] v, address[] to, uint256[] value, uint256[] fee, uint256[] seq, uint256[] deadline
    ) public returns (bool) {
        require(r.length == s.length && r.length == v.length && r.length == to.length && r.length == value.length, "length mismatch");
        require(r.length == fee.length && r.length == seq.length && r.length == deadline.length, "length mismatch");

        for (uint i = 0; i < r.length; i++) {
            require(
                _betaDelegatedTransfer(r[i], s[i], v[i], to[i], value[i], fee[i], seq[i], deadline[i]),
                "failed transfer"
            );
        }
        return true;
    }

    /**
    * @dev Gets whether the address is currently whitelisted for betaDelegateTransfer.
    * @param _addr The address to check if whitelisted.
    * @return A bool representing whether the given address is whitelisted.
    */
    function isWhitelistedBetaDelegate(address _addr) public view returns (bool) {
        return betaDelegateWhitelist[_addr];
    }

    /**
     * @dev Sets a new betaDelegate whitelister.
     * @param _newWhitelister The address allowed to whitelist betaDelegates.
     */
    function setBetaDelegateWhitelister(address _newWhitelister) public {
        require(msg.sender == betaDelegateWhitelister || msg.sender == owner, "only Whitelister or Owner");
        betaDelegateWhitelister = _newWhitelister;
        emit BetaDelegateWhitelisterSet(betaDelegateWhitelister, _newWhitelister);
    }

    modifier onlyBetaDelegateWhitelister() {
        require(msg.sender == betaDelegateWhitelister, "onlyBetaDelegateWhitelister");
        _;
    }

    /**
     * @dev Whitelists an address to allow calling BetaDelegatedTransfer.
     * @param _addr The new address to whitelist.
     */
    function whitelistBetaDelegate(address _addr) public onlyBetaDelegateWhitelister {
        require(!betaDelegateWhitelist[_addr], "delegate already whitelisted");
        betaDelegateWhitelist[_addr] = true;
        emit BetaDelegateWhitelisted(_addr);
    }

    /**
     * @dev Unwhitelists an address to disallow calling BetaDelegatedTransfer.
     * @param _addr The new address to whitelist.
     */
    function unwhitelistBetaDelegate(address _addr) public onlyBetaDelegateWhitelister {
        require(betaDelegateWhitelist[_addr], "delegate not whitelisted");
        betaDelegateWhitelist[_addr] = false;
        emit BetaDelegateUnwhitelisted(_addr);
    }
}