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// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

import "./interface/IBoringDAO.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "./interface/IAddressResolver.sol";
import "./interface/ITunnel.sol";
import "./ParamBook.sol";
import "./lib/SafeDecimalMath.sol";
import "./interface/IMintProposal.sol";
import "./interface/IOracle.sol";
import "./interface/ITrusteeFeePool.sol";

/**
@notice The BoringDAO contract is the entrance to the entire system, 
providing the functions of pledge BOR, redeem BOR, mint bBTC, and destroy bBTC
 */
contract BoringDAOV2 is AccessControl, IBoringDAO, Pausable {
    using SafeDecimalMath for uint256;
    using SafeMath for uint256;

    uint256 public amountByMint=12250000e18;

    bytes32 public constant MONITOR_ROLE = "MONITOR_ROLE ";
    bytes32 public constant GOV_ROLE = "GOV_ROLE";

    // bor => boring
    bytes32 public constant BOR = "BORING";
    bytes32 public constant PARAM_BOOK = "ParamBook";
    bytes32 public constant MINT_PROPOSAL = "MintProposal";
    bytes32 public constant ORACLE = "Oracle";
    bytes32 public constant TRUSTEE_FEE_POOL = "TrusteeFeePool";
    bytes32 public constant OTOKEN = "oToken";

    bytes32 public constant TUNNEL_MINT_FEE_RATE = "mint_fee";
    bytes32 public constant NETWORK_FEE = "network_fee";

    IAddressResolver public addrReso;

    // tunnels
    ITunnelV2[] public tunnels;

    uint256 public mintCap;

    address public mine;

    // The user may not provide the Ethereum address or the format of the Ethereum address is wrong when mint. 
    // this is for a transaction
    mapping(string=>bool) public approveFlag;

    uint public reductionAmount=100000000e18;
    mapping(bytes32=>uint) public minMintAmount;

    constructor(IAddressResolver _addrReso, uint _mintCap, address _mine) public {
        // set up resolver
        addrReso = _addrReso;
        mintCap = _mintCap;
        mine = _mine;
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(MONITOR_ROLE, msg.sender);
    }


    function tunnel(bytes32 tunnelKey) internal view returns (ITunnel) {
        return ITunnel(addrReso.key2address(tunnelKey));
    }

    function otoken(bytes32 _tunnelKey) internal view returns (IERC20) {
        return IERC20(addrReso.requireKKAddrs(_tunnelKey, OTOKEN, "oToken not exist"));
    }

    function borERC20() internal view returns (IERC20) {
        return IERC20(addrReso.key2address(BOR));
    }

    function paramBook() internal view returns (ParamBook) {
        return ParamBook(addrReso.key2address(PARAM_BOOK));
    }

    function mintProposal() internal view returns (IMintProposal) {
        return IMintProposal(addrReso.key2address(MINT_PROPOSAL));
    }

    function oracle() internal view returns (IOracle) {
        return IOracle(addrReso.key2address(ORACLE));
    }

    // trustee fee pool key
    function trusteeFeePool(bytes32 _tunnelKey) internal view returns (ITrusteeFeePool) {
        return ITrusteeFeePool(addrReso.requireKKAddrs(_tunnelKey, TRUSTEE_FEE_POOL, "BoringDAO::TrusteeFeePool is address(0)"));
    }

    // trustee fee pool key => tfpk
    function addTrustee(address account, bytes32 _tunnelKey) public onlyAdmin {
        _setupRole(_tunnelKey, account);
        trusteeFeePool(_tunnelKey).enter(account);

    }

    function addTrustees(address[] memory accounts, bytes32 _tunnelKey) external onlyAdmin{
        for (uint256 i = 0; i < accounts.length; i++) {
            addTrustee(accounts[i], _tunnelKey);
        }
    }

    function removeTrustee(address account, bytes32 _tunnelKey) public onlyAdmin {
        revokeRole(_tunnelKey, account);
        trusteeFeePool(_tunnelKey).exit(account);
    }

    function setMine(address _mine) public onlyAdmin {
        mine = _mine;
    }

    function setMintCap(uint256 amount) public onlyAdmin {
        mintCap = amount;
    }

    function setMinMintAmount(bytes32 _tunnelKey, uint _amount) public onlyAdmin {
        minMintAmount[_tunnelKey] = _amount;
    }

    /**
    @notice tunnelKey is byte32("symbol"), eg. bytes32("BTC")
     */
    function pledge(bytes32 _tunnelKey, uint256 _amount)
        public
        override
        whenNotPaused
        whenContractExist(_tunnelKey)
    {
        require(
            borERC20().allowance(msg.sender, address(this)) >= _amount,
            "not allow enough boring"
        );

        borERC20().transferFrom(
            msg.sender,
            address(tunnel(_tunnelKey)),
            _amount
        );
        tunnel(_tunnelKey).pledge(msg.sender, _amount);
    }

    /**
    @notice redeem bor from tunnel
     */
    function redeem(bytes32 _tunnelKey, uint256 _amount)
        public
        override
        whenNotPaused
        whenContractExist(_tunnelKey)
    {
        tunnel(_tunnelKey).redeem(msg.sender, _amount);
    }

    function burnBToken(bytes32 _tunnelKey, uint256 amount, string memory assetAddress)
        public
        override
        whenNotPaused
        whenContractExist(_tunnelKey)
        whenTunnelNotPause(_tunnelKey)
    {
        tunnel(_tunnelKey).burn(msg.sender, amount, assetAddress);
    }

    /**
    @notice trustee will call the function to approve mint bToken
    @param _txid the transaction id of bitcoin
    @param _amount the amount to mint, 1BTC = 1bBTC = 1*10**18 weibBTC
    @param to mint to the address
     */
    function approveMint(
        bytes32 _tunnelKey,
        string memory _txid,
        uint256 _amount,
        address to,
        string memory assetAddress
    ) public override whenNotPaused whenTunnelNotPause(_tunnelKey) onlyTrustee(_tunnelKey) shouldMoreThan(_tunnelKey, _amount){
        if(to == address(0)) {
            if (approveFlag[_txid] == false) {
                approveFlag[_txid] = true;
                emit ETHAddressNotExist(_tunnelKey, _txid, _amount, to, msg.sender, assetAddress);
            }
            return;
        }
        
        uint256 trusteeCount = getRoleMemberCount(_tunnelKey);
        bool shouldMint = mintProposal().approve(
            _tunnelKey,
            _txid,
            _amount,
            to,
            msg.sender,
            trusteeCount
        );
        if (!shouldMint) {
            return;
        }
        uint256 canIssueAmount = tunnel(_tunnelKey).canIssueAmount();
        if (_amount.add(otoken(_tunnelKey).totalSupply()) > canIssueAmount) {
            emit NotEnoughPledgeValue(
                _tunnelKey,
                _txid,
                _amount,
                to,
                msg.sender,
                assetAddress
            );
            return;
        }
        // fee calculate in tunnel
        tunnel(_tunnelKey).issue(to, _amount);

        uint borMintAmount = calculateMintBORAmount(_tunnelKey, _amount);
        if(borMintAmount != 0) {
            amountByMint = amountByMint.add(borMintAmount);
            borERC20().transferFrom(mine, to, borMintAmount);
        }
        emit ApproveMintSuccess(_tunnelKey, _txid, _amount, to, assetAddress);
    }

    function calculateMintBORAmount(bytes32 _tunnelKey, uint _amount) public view returns (uint) {
        if (amountByMint >= mintCap || _amount == 0) {
            return 0;
        }
        uint256 assetPrice = oracle().getPrice(_tunnelKey);
        uint256 borPrice = oracle().getPrice(BOR);
        uint256 reductionTimes = amountByMint.div(reductionAmount);
        uint256 mintFeeRate = paramBook().params2(
            _tunnelKey,
            TUNNEL_MINT_FEE_RATE
        );
        // for decimal calculation, so mul 1e18
        uint256 reductionFactor = (4**reductionTimes).mul(1e18).div(5**reductionTimes);
        uint networkFee = paramBook().params2(_tunnelKey, NETWORK_FEE);
        uint baseAmount = _amount.multiplyDecimalRound(mintFeeRate).mul(2).add(networkFee);
        uint borAmount = assetPrice.multiplyDecimalRound(baseAmount).multiplyDecimalRound(reductionFactor).divideDecimalRound(borPrice);
        if (amountByMint.add(borAmount) >= mintCap) {
            borAmount = mintCap.sub(amountByMint);
        }
        return borAmount;
    }

    function pause() public onlyMonitor{
        _pause();
    }

    function unpause() public onlyMonitor{
        _unpause();
    }

    modifier onlyTrustee(bytes32 _tunnelKey) {
        require(hasRole(_tunnelKey, msg.sender), "Caller is not trustee");
        _;
    }

    modifier onlyAdmin {
        require(hasRole(DEFAULT_ADMIN_ROLE, msg.sender), "BoringDAO::caller is not admin");
        _;
    }

    modifier onlyMonitor {
        require(
            hasRole(MONITOR_ROLE, msg.sender),
            "Caller is not monitor"
        );
        _;
    }

    modifier whenContractExist(bytes32 key) {
        require(
            addrReso.key2address(key) != address(0),
            "Contract not exist"
        );
        _;
    }

    modifier whenTunnelNotPause(bytes32 _tunnelKey) {
        address tunnelAddress = addrReso.requireAndKey2Address(_tunnelKey, "tunnel not exist");
        require(IPaused(tunnelAddress).paused() == false, "tunnel is paused");
        _;
    }

    modifier shouldMoreThan(bytes32 _tunnelKey, uint amount) {
        require(amount >= minMintAmount[_tunnelKey], "Mint Amount should more than min amount");
        _;
    }

    event NotEnoughPledgeValue(
        bytes32 indexed _tunnelKey,
        string indexed _txid,
        uint256 _amount,
        address to,
        address trustee,
        string assetAddress
    );

    event ApproveMintSuccess(
        bytes32 _tunnelKey,
        string _txid,
        uint256 _amount,
        address to,
        string assetAddress
    );

    event ETHAddressNotExist(
        bytes32 _tunnelKey,
        string _txid,
        uint256 _amount,
        address to,
        address trustee,
        string assetAddress
    );

    event NotEnoughMintAmount(
        bytes32 indexed _tunnelKey,
        string indexed _txid,
        uint256 _amount,
        address to,
        address trustee,
        string assetAddress
    );

   
}

interface IPaused {
    function paused() external view returns (bool);
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../utils/EnumerableSet.sol";
import "../utils/Address.sol";
import "../GSN/Context.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping (bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

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;
    }
}

// SPDX-License-Identifier: MIT

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);
}

// SPDX-License-Identifier: MIT

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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import "@openzeppelin/contracts/access/Ownable.sol";

contract ParamBook is Ownable {
    mapping(bytes32 => uint256) public params;
    mapping(bytes32 => mapping(bytes32 => uint256)) public params2;

    function setParams(bytes32 name, uint256 value) public onlyOwner {
        params[name] = value;
    }

    function setMultiParams(bytes32[] memory names, uint[] memory values) public onlyOwner {
        require(names.length == values.length, "ParamBook::setMultiParams:param length not match");
        for (uint i=0; i < names.length; i++ ) {
            params[names[i]] = values[i];
        }
    }

    function setParams2(
        bytes32 name1,
        bytes32 name2,
        uint256 value
    ) public onlyOwner {
        params2[name1][name2] = value;
    }

    function setMultiParams2(bytes32[] memory names1, bytes32[] memory names2, uint[] memory values) public onlyOwner {
        require(names1.length == names2.length, "ParamBook::setMultiParams2:param length not match");
        require(names1.length == values.length, "ParamBook::setMultiParams2:param length not match");
        for(uint i=0; i < names1.length; i++) {
            params2[names1[i]][names2[i]] = values[i];
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IAddressResolver {
    
    function key2address(bytes32 key) external view returns(address);
    function address2key(address addr) external view returns(bytes32);
    function requireAndKey2Address(bytes32 name, string calldata reason) external view returns(address);

    function setAddress(bytes32 key, address addr) external;
    function setMultiAddress(bytes32[] memory keys, address[] memory addrs) external;
    
    function setKkAddr(bytes32 k1, bytes32 k2, address addr) external;
    function setMultiKKAddr(bytes32[] memory k1s, bytes32[] memory k2s, address[] memory addrs) external;

    function kk2addr(bytes32 k1, bytes32 k2) external view returns(address);
    function requireKKAddrs(bytes32 k1, bytes32 k2, string calldata reason) external view returns(address);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IBoringDAO {
    // function openTunnel(bytes32 tunnelKey) external;

    function pledge(bytes32 tunnelKey, uint _amount) external;
    function redeem(bytes32 tunnelKey, uint _amount) external;

    function approveMint(bytes32 tunnelKey, string memory _txid, uint _amount, address account, string memory assetAddress) external;
    function burnBToken(bytes32 _tunnelKey, uint _amount, string memory assetAddress) external;

    // function getTrustee(uint index) external view returns(address);
    // function getTrusteeCount() external view returns(uint);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IMintProposal {
    function approve(
        bytes32 _tunnelKey,
        string memory _txid,
        uint256 _amount,
        address  to,
        address trustee,
        uint256 trusteeCount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

interface IOracle {
    
    function setPrice(bytes32 _symbol, uint _price) external;
    function getPrice(bytes32 _symbol) external view returns (uint);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface ITrusteeFeePool {
    function exit(address account) external;
    function enter(address account) external;
    function notifyReward(uint reward) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface ITunnel {
    function pledge(address account, uint amount) external;
    function redeem(address account, uint amount) external;
    function issue(address account, uint amount) external;
    function burn(address account, uint amount, string memory assetAddress) external;
    function totalValuePledge() external view  returns(uint);
    function canIssueAmount() external view returns(uint);
    function oTokenKey() external view returns(bytes32);
}

interface ITunnelV2 {
    function pledge(address account, uint amount) external;
    function redeem(address account, uint amount) external;
    function issue(address account, uint amount) external;
    function burn(address account, uint amount, string memory assetAddress) external;
    function totalValuePledge() external view  returns(uint);
    function canIssueAmount() external view returns(uint);
}

interface ITunnelTVL {
    function totalTVL() external view returns(uint);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.8;

// Libraries
import "@openzeppelin/contracts/math/SafeMath.sol";

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

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

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

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

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

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

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

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

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

        return quotientTimesTen / 10;
    }

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

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

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

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

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

        return resultTimesTen / 10;
    }

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

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

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

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

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

        return quotientTimesTen / 10;
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IAddressResolver","name":"_addrReso","type":"address"},{"internalType":"uint256","name":"_mintCap","type":"uint256"},{"internalType":"address","name":"_mine","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"indexed":false,"internalType":"string","name":"_txid","type":"string"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"string","name":"assetAddress","type":"string"}],"name":"ApproveMintSuccess","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"indexed":false,"internalType":"string","name":"_txid","type":"string"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"address","name":"trustee","type":"address"},{"indexed":false,"internalType":"string","name":"assetAddress","type":"string"}],"name":"ETHAddressNotExist","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"indexed":true,"internalType":"string","name":"_txid","type":"string"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"address","name":"trustee","type":"address"},{"indexed":false,"internalType":"string","name":"assetAddress","type":"string"}],"name":"NotEnoughMintAmount","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"indexed":true,"internalType":"string","name":"_txid","type":"string"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"address","name":"trustee","type":"address"},{"indexed":false,"internalType":"string","name":"assetAddress","type":"string"}],"name":"NotEnoughPledgeValue","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"BOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GOV_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINT_PROPOSAL","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MONITOR_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"NETWORK_FEE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ORACLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"OTOKEN","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PARAM_BOOK","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TRUSTEE_FEE_POOL","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TUNNEL_MINT_FEE_RATE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"}],"name":"addTrustee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"accounts","type":"address[]"},{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"}],"name":"addTrustees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"addrReso","outputs":[{"internalType":"contract IAddressResolver","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"amountByMint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"approveFlag","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"string","name":"_txid","type":"string"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"string","name":"assetAddress","type":"string"}],"name":"approveMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"string","name":"assetAddress","type":"string"}],"name":"burnBToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"calculateMintBORAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getRoleMember","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleMemberCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"minMintAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mine","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintCap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"pledge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"redeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reductionAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"}],"name":"removeTrustee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_tunnelKey","type":"bytes32"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"setMinMintAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_mine","type":"address"}],"name":"setMine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"setMintCap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tunnels","outputs":[{"internalType":"contract ITunnelV2","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000ce61e08c01fb6e1ca1bb4d0acf4eb1d5fe66bf79000000000000000000000000000000000000000001a5dcb365fc4166be00000000000000000000000000000067ee188ee1319cdac271553e7b8faaed2fbc52cc

-----Decoded View---------------
Arg [0] : _addrReso (address): 0xCE61e08C01fb6E1ca1BB4d0ACF4eB1D5Fe66bF79
Arg [1] : _mintCap (uint256): 510000000000000000000000000
Arg [2] : _mine (address): 0x67Ee188Ee1319CDAc271553e7b8FAAed2fBC52CC

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000ce61e08c01fb6e1ca1bb4d0acf4eb1d5fe66bf79
Arg [1] : 000000000000000000000000000000000000000001a5dcb365fc4166be000000
Arg [2] : 00000000000000000000000067ee188ee1319cdac271553e7b8faaed2fbc52cc