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0x812e9eE2437a3e4FE0A4A4A7f195536844301f07

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Complete Cross C...130955382024-03-20 12:36:29231 days ago1710938189IN
XY Finance : $DBX Bridge
0 CRO0.729204855,050
Complete Cross C...130955312024-03-20 12:35:50231 days ago1710938150IN
XY Finance : $DBX Bridge
0 CRO0.621336855,050
Complete Cross C...130944852024-03-20 10:57:51231 days ago1710932271IN
XY Finance : $DBX Bridge
0 CRO0.729154355,050
Complete Cross C...109717422023-11-03 13:34:42369 days ago1699018482IN
XY Finance : $DBX Bridge
0 CRO0.66818524,628.69971156
Complete Cross C...100406192023-09-03 19:14:45430 days ago1693768485IN
XY Finance : $DBX Bridge
0 CRO0.674315274,670.84079541
Complete Cross C...99376362023-08-28 2:01:46436 days ago1693188106IN
XY Finance : $DBX Bridge
0 CRO0.57500584,675.52820508
Complete Cross C...99330342023-08-27 18:49:24437 days ago1693162164IN
XY Finance : $DBX Bridge
0 CRO0.57521874,675.73852199
Complete Cross C...99257542023-08-27 7:22:58437 days ago1693120978IN
XY Finance : $DBX Bridge
0 CRO0.575142734,676.07128166
Complete Cross C...99255842023-08-27 7:06:58437 days ago1693120018IN
XY Finance : $DBX Bridge
0 CRO0.57526064,676.07912505
Complete Cross C...99247782023-08-27 5:50:58437 days ago1693115458IN
XY Finance : $DBX Bridge
0 CRO0.575078094,676.11599424
Complete Cross C...98794612023-08-24 6:52:14440 days ago1692859934IN
XY Finance : $DBX Bridge
0 CRO0.575449674,678.18643927
Complete Cross C...98793592023-08-24 6:42:35440 days ago1692859355IN
XY Finance : $DBX Bridge
0 CRO0.575403464,678.19108097
Complete Cross C...98739792023-08-23 22:17:26440 days ago1692829046IN
XY Finance : $DBX Bridge
0 CRO0.575433694,678.43682371
Complete Cross C...98739132023-08-23 22:11:16440 days ago1692828676IN
XY Finance : $DBX Bridge
0 CRO0.575551024,678.43984182
Complete Cross C...98737152023-08-23 21:52:37440 days ago1692827557IN
XY Finance : $DBX Bridge
0 CRO0.575364994,678.44885442
Complete Cross C...98471572023-08-22 4:17:13442 days ago1692677833IN
XY Finance : $DBX Bridge
0 CRO0.675518334,679.66036068
Complete Cross C...98266662023-08-20 20:11:30444 days ago1692562290IN
XY Finance : $DBX Bridge
0 CRO0.575816554,680.59824723
Complete Cross C...97808842023-08-17 20:27:44447 days ago1692304064IN
XY Finance : $DBX Bridge
0 CRO0.67597694,682.6749288
Complete Cross C...97808652023-08-17 20:25:57447 days ago1692303957IN
XY Finance : $DBX Bridge
0 CRO0.575814594,682.67579015
Complete Cross C...97808622023-08-17 20:25:40447 days ago1692303940IN
XY Finance : $DBX Bridge
0 CRO0.575814614,682.67592815
Complete Cross C...97600542023-08-16 11:50:53448 days ago1692186653IN
XY Finance : $DBX Bridge
0 CRO0.575837114,683.62072345
Complete Cross C...97598722023-08-16 11:33:49448 days ago1692185629IN
XY Finance : $DBX Bridge
0 CRO0.57590844,683.62910346
Complete Cross C...97489572023-08-15 18:28:47449 days ago1692124127IN
XY Finance : $DBX Bridge
0 CRO0.676186354,684.12582415
Complete Cross C...97177882023-08-13 17:42:29451 days ago1691948549IN
XY Finance : $DBX Bridge
0 CRO0.676509094,685.55010195
Complete Cross C...97042022023-08-12 20:27:17452 days ago1691872037IN
XY Finance : $DBX Bridge
0 CRO0.576385044,686.17161288
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Contract Source Code Verified (Exact Match)

Contract Name:
XYCrossChainRelay

Compiler Version
v0.8.2+commit.661d1103

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
File 1 of 16 : XYCrossChainRelay.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.2;

import "AccessControl.sol";
import "Pausable.sol";
import "SafeERC20.sol";
import "ERC20.sol";
import "ECDSA.sol";
import { Address } from "Address.sol";
import { Supervisor } from "Supervisor.sol";
import { IERC20MintBurnable } from "IERC20MintBurnable.sol";

/// @title XYCrossChainRelay relays token across different chains. It also inherits from ERC-20, which
/// serves as the redeemable tokens. Tokens are minted when liquidity is deposited and are burnt when
/// liquidity is withdrawn
contract XYCrossChainRelay is ERC20, AccessControl, Pausable {
    using ECDSA for bytes32;
    using SafeERC20 for IERC20MintBurnable;
    using SafeERC20 for IERC20;

    /* ========== CONSTANTS ========== */

    address public constant ETHER_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;

    // Roles in this contract
    // Owner: the admin of `ROLE_MANAGER`
    bytes32 public constant ROLE_OWNER = keccak256("ROLE_OWNER");
    // Manager: able to pause/unpause contract
    bytes32 public constant ROLE_MANAGER = keccak256("ROLE_MANAGER");
    // Staff: able to relay cross chain requests
    bytes32 public constant ROLE_STAFF = keccak256("ROLE_STAFF");

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

    uint32 public immutable thisChainId;
    // If `token` is Primitive Token, which means the token is not mint/burnable by us.
    // We can only transfer `token`s.
    bool public immutable isPrimitive;
    // A contract that supervises each cross chain relay by providing signatures
    Supervisor public immutable supervisor;
    // Token to be bridged
    address public immutable token;

    // If this flag is true, token bridge will be able to mint redeemable token to receiver when there is no liquidity during completeCrossChainRequest.
    // Otherwise, tx will fail when there is no liqiuidity.
    bool public isAbleToMintIfNoLiquidity;
    // Treasury where cross chain fees are sent to
    address public treasury;
    address public pendingTreasury;

    // Max amount of `token` allowed in each cross chain request
    uint256 public maxCrossChainAmount;

    // Number of the cross chain requests
    uint256 public numCrossChainRequests;

    // Mapping of completed cross chain requests: source chain id => request id => request
    mapping (uint32 => mapping (uint256 => bool)) public completedCrossChainRequest;

    /* ========== CONSTRUCTOR ========== */

    /// @param chainId The ID of this chain, passed in as param for easier configuration for testing
    /// @param _treasury The Treasury address
    /// @param _supervisor The Supervisor address
    /// @param owner The owner address
    /// @param manager The manager address
    /// @param staff The staff address
    /// @param _token The token address
    /// @param _isPrimitive Is `_token` primitive token (which we don't have mint/burn privilege)
    /// @param _maxCrossChainAmount Max cross chain amount
    /// @param _redeemableTokenName The name of the Redeemable Token
    /// @param _redeemableTokenSymbol The symbol of the Redeemable Token
    constructor(
        uint32 chainId,
        address _treasury,
        address _supervisor,
        address owner,
        address manager,
        address staff,
        address _token,
        bool _isPrimitive,
        uint256 _maxCrossChainAmount,
        string memory _redeemableTokenName,
        string memory _redeemableTokenSymbol
    ) ERC20(_redeemableTokenName, _redeemableTokenSymbol) {
        require(Address.isContract(_supervisor), "ERR_SUPERVISOR_NOT_CONTRACT");
        supervisor = Supervisor(_supervisor);
        // Token can only be either native (ETHER_ADDRESS) or ERC-20 token
        if (_token != ETHER_ADDRESS) {
            require(Address.isContract(_token), "ERR_TOKEN_NOT_CONTRACT");
        } else {
            // If it's native token, it must be primitive since we cannot mint/burn it
            require(_isPrimitive, "ERR_NATIVE_TOKEN_NOT_PRIMITIVE");
        }
        // Token can only be either native (ETHER_ADDRESS) or ERC-20 token
        token = _token;

        thisChainId = chainId;
        isPrimitive = _isPrimitive;

        treasury = _treasury;
        maxCrossChainAmount = _maxCrossChainAmount;

        _setRoleAdmin(ROLE_OWNER, ROLE_OWNER);
        _setRoleAdmin(ROLE_MANAGER, ROLE_OWNER);
        _setRoleAdmin(ROLE_STAFF, ROLE_MANAGER);
        _setupRole(ROLE_OWNER, owner);
        _setupRole(ROLE_MANAGER, manager);
        _setupRole(ROLE_STAFF, staff);
    }

    /* ========== MODIFIERS ========== */
    modifier onlyPrimitiveToken() {
        require(isPrimitive, "ERR_NOT_PRIMITIVE_TOKEN");
        _;
    }

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

    /// @notice Transfer ERC-20 token from user and check balance change
    /// @param sender The address to transfer token from
    /// @param amount Amount of the token to be transferred
    function _safeTransferAssetFrom(address sender, uint256 amount) private {
        uint256 bal = IERC20(token).balanceOf(address(this));
        IERC20(token).safeTransferFrom(sender, address(this), amount);
        bal = IERC20(token).balanceOf(address(this)) - bal;
        require(bal == amount, "ERR_AMOUNT_NOT_ENOUGH");
    }

    /// @notice Unified transfer interface for native token and ERC20 token
    /// @param _token Address of the token. Can be either `ETH_ADDRESS` for native token or ERC-20 token address
    /// @param receiver The address to receive token
    /// @param amount Amount of the token to be transferred
    function _safeTransferTokenUnified(address _token, address receiver, uint256 amount) private {
        if (_token == ETHER_ADDRESS) {
            payable(receiver).transfer(amount);
        } else {
            IERC20(_token).safeTransfer(receiver, amount);
        }
    }

    /// @notice Unified get balance interface for native token and ERC20 token
    /// @param _token Address of the token. Can be either `ETH_ADDRESS` for native token or ERC-20 token address
    function _getTokenBalanceUnified(address _token) view private returns (uint256) {
        if (_token == ETHER_ADDRESS)  {
            return address(this).balance;
        } else {
            return IERC20(_token).balanceOf(address(this));
        }
    }

    /* ========== RESTRICTED FUNCTIONS (TREASURY) ========== */

    function proposeNewTreasury(address newTreasury) external {
        require(msg.sender == treasury, "ERR_NOT_TREASURY");
        pendingTreasury = newTreasury;
        emit NewTreasuryProposed(newTreasury);
    }

    function acceptNewTreasury() external {
        require(msg.sender == pendingTreasury, "ERR_NOT_PENDING_TREASURY");
        pendingTreasury = address(0);
        treasury = msg.sender;
        emit NewTreasuryAccepted(msg.sender);
    }

    /* ========== RESTRICTED FUNCTIONS (OWNER) ========== */

    /// @notice Rescue fund accidentally sent to this contract. Token can be rescued only if it's not `token`
    /// @param tokens List of token address to rescue
    function rescue(IERC20[] memory tokens) external onlyRole(ROLE_OWNER) {
        for (uint256 i; i < tokens.length; i++) {
            IERC20 _token = tokens[i];
            require(token != address(_token), "ERR_CAN_NOT_RESCUE_BRIDGE_TOKEN");
            uint256 _tokenBalance = _getTokenBalanceUnified(address(_token));
            _safeTransferTokenUnified(address(_token), msg.sender, _tokenBalance);
        }
    }

    /* ========== RESTRICTED FUNCTIONS (MANAGER) ========== */

    /// @notice Pause the contract (could be executed only by manager)
    function pause() external onlyRole(ROLE_MANAGER) {
        _pause();
    }

    /// @notice Unpause the contract (could be executed only by manager)
    function unpause() external onlyRole(ROLE_MANAGER) {
        _unpause();
    }

    /// @notice Set max cross chain amount (could be executed only by manager)
    /// @param newMaxCrossChainAmount New max cross chain amount
    function setMaxCrossChainAmount(uint256 newMaxCrossChainAmount) external onlyRole(ROLE_MANAGER) {
        maxCrossChainAmount = newMaxCrossChainAmount;
    }

    /// @notice Set isAbleToMintIfNoLiquidity flag
    /// @param _set Switch on or off isAbleToMintIfNoLiquidity
    function setIsAbleToMintIfNoLiquidity(bool _set) external onlyPrimitiveToken onlyRole(ROLE_MANAGER) {
        isAbleToMintIfNoLiquidity = _set;
        emit IsAbleToMintIfNoLiquiditySet(msg.sender, _set);
    }

    /* ========== RESTRICTED FUNCTIONS (STAFF) ========== */

    /// @notice Complete a cross chain request
    /// @param requestId ID of the cross chain request on the source chain
    /// @param sourceChainId Chain Id of the source chain
    /// @param receiver Receiver of the `token`
    /// @param amount Amount of `token`
    /// @param fee Fee amount (denominated in `token`)
    /// @param signatures Signatures of validators
    function completeCrossChainRequest(uint256 requestId, uint32 sourceChainId, address receiver, uint256 amount, uint256 fee, bytes[] memory signatures) external whenNotPaused onlyRole(ROLE_STAFF) {
        require(!completedCrossChainRequest[sourceChainId][requestId], "ERR_CROSS_CHAIN_REQUEST_ALREADY_COMPLETE");
        require(amount > fee, "ERR_FEE_GREATER_THAN_AMOUNT");
        require(amount <= maxCrossChainAmount, "ERR_INVALID_CROSS_CHAIN_AMOUNT");

        bytes32 sigId = keccak256(abi.encodePacked(supervisor.VALIDATE_XY_CROSS_CHAIN_IDENTIFIER(), address(this), sourceChainId, thisChainId, requestId, receiver, amount, fee));
        bytes32 sigIdHash = sigId.toEthSignedMessageHash();
        supervisor.checkSignatures(sigIdHash, signatures);
        uint256 amountSubFee = amount - fee;

        bool isRedeemableTokenMinted = false;
        if (isPrimitive) {
            if (checkBridgeLiquidityEnough(amount)) {
                _safeTransferTokenUnified(token, receiver, amountSubFee);
                _safeTransferTokenUnified(token, treasury, fee);
            } else {
                require(isAbleToMintIfNoLiquidity, "ERR_NO_MINT_WHEN_NO_LIQUIDITY");
                isRedeemableTokenMinted = true;
                // Mint redeemable token to receiver
                _mint(receiver, amountSubFee);
                _mint(treasury, fee);
            }
        } else {
            IERC20MintBurnable(token).mint(receiver, amountSubFee);
            IERC20MintBurnable(token).mint(treasury, fee);
        }

        completedCrossChainRequest[sourceChainId][requestId] = true;
        emit CrossChainCompleted(requestId, sourceChainId, thisChainId, receiver, amount, fee, isRedeemableTokenMinted);
    }

    /* ========== VIEW FUNCTIONS ========== */

    /// @notice check if token bridge liquidity is enough
    /// @param amount Amount of `token`
    function checkBridgeLiquidityEnough(uint256 amount) public view returns (bool) {
        uint256 balance = _getTokenBalanceUnified(token);
        return (amount <= balance);
    }

    /* ========== WRITE FUNCTIONS ========== */

    /// @notice Request to bridge `token` cross chain
    /// @param destChainId Chain Id of the destination chain
    /// @param receiver Receiver of the `token` on destination chain
    /// @param amount Amount of `token` to send cross chain
    function requestCrossChain(uint32 destChainId, address receiver, uint256 amount) external payable whenNotPaused {
        require(amount > 0 && amount <= maxCrossChainAmount, "ERR_INVALID_CROSS_CHAIN_AMOUNT");

        uint256 id = numCrossChainRequests++;
        // Transfer token from sender
        if (token == ETHER_ADDRESS) {
            require(msg.value == amount, "ERR_MSG_VALUE_AMOUNT_MISMATCHED");
        } else {
            require(msg.value == 0, "ERR_EXPECTED_ZERO_MSG_VALUE");
            _safeTransferAssetFrom(msg.sender, amount);
            if (!isPrimitive) {
                IERC20MintBurnable(token).burn(amount);
            }
        }

        emit CrossChainRequested(id, thisChainId, destChainId, msg.sender, receiver, amount);
    }

    function deposit(uint256 amount) payable external whenNotPaused onlyPrimitiveToken {
        require(amount > 0, "ERR_ZERO_AMOUNT");
        // Transfer token from depositor
        if (token == ETHER_ADDRESS) {
            require(msg.value == amount, "ERR_MSG_VALUE_AMOUNT_MISMATCHED");
        } else {
            require(msg.value == 0, "ERR_EXPECTED_ZERO_MSG_VALUE");
            _safeTransferAssetFrom(msg.sender, amount);
        }

        // Mint 1:1 LP token to depositor
        _mint(msg.sender, amount);
        emit Deposited(msg.sender, amount);
    }

    function withdraw(uint256 amount) external whenNotPaused onlyPrimitiveToken {
        require(amount > 0, "ERR_ZERO_AMOUNT");
        // Burn withdrawer LP token
        _burn(msg.sender, amount);
        // Transfer 1:1 token to withdrawer.
        _safeTransferTokenUnified(token, msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

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

    event NewTreasuryProposed(address newTreasury);
    event NewTreasuryAccepted(address newTreasury);
    event CrossChainRequested(uint256 indexed requestId, uint32 sourceChainId, uint32 indexed destChainId, address indexed sender, address receiver, uint256 amount);
    event CrossChainCompleted(uint256 indexed requestId, uint32 indexed sourceChainId, uint32 destChainId, address indexed receiver, uint256 amount, uint256 fee, bool isRedeemableTokenMinted);
    event Deposited(address indexed sender, uint256 amount);
    event Withdrawn(address indexed sender, uint256 amount);
    event IsAbleToMintIfNoLiquiditySet(address sender, bool isSet);
}

File 2 of 16 : AccessControl.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IAccessControl.sol";
import "Context.sol";
import "Strings.sol";
import "ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * 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, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address => bool) members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with a standardized message including the required role.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     *
     * _Available since v4.1._
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role, _msgSender());
        _;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

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

    /**
     * @dev Revert with a standard message if `account` is missing `role`.
     *
     * The format of the revert reason is given by the following regular expression:
     *
     *  /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
     */
    function _checkRole(bytes32 role, address account) internal view {
        if (!hasRole(role, account)) {
            revert(
                string(
                    abi.encodePacked(
                        "AccessControl: account ",
                        Strings.toHexString(uint160(account), 20),
                        " is missing role ",
                        Strings.toHexString(uint256(role), 32)
                    )
                )
            );
        }
    }

    /**
     * @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 override 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 override onlyRole(getRoleAdmin(role)) {
        _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 override onlyRole(getRoleAdmin(role)) {
        _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 override {
        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 {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

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

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

File 3 of 16 : IAccessControl.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @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 {AccessControl-_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) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @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) external;

    /**
     * @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) external;

    /**
     * @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) external;
}

File 4 of 16 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 5 of 16 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 6 of 16 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 7 of 16 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 8 of 16 : Pausable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "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.
 */
abstract 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() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual 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());
    }
}

File 9 of 16 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "Address.sol";

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

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

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

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

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

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

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

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

File 10 of 16 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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);
}

File 11 of 16 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

        (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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 12 of 16 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";
import "IERC20Metadata.sol";
import "Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

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

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

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

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

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

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

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

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

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

        return true;
    }

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

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

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

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

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

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

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

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

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

        _afterTokenTransfer(account, address(0), amount);
    }

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

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

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 13 of 16 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 14 of 16 : ECDSA.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s;
        uint8 v;
        assembly {
            s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
            v := add(shr(255, vs), 27)
        }
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

File 15 of 16 : Supervisor.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.2;

import "ECDSA.sol";

/// @title Supervisor is the guardian of YPool. It requires multiple validators to valid
/// the requests from users and workers and sign on them if valid.
contract Supervisor {
    using ECDSA for bytes32;

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

    bytes32 public constant SET_THRESHOLD_IDENTIFIER = 'SET_THRESHOLD';
    bytes32 public constant SET_VALIDATOR_IDENTIFIER = 'SET_VALIDATOR';
    bytes32 public constant VALIDATE_XY_CROSS_CHAIN_IDENTIFIER = 'VALIDATE_XY_XCHAIN_IDENTIFIER';

    // the chain ID contract located at
    uint32 immutable public chainId;

    // number of validators
    uint256 public validatorsNum;
    // threshold to pass the signature validation
    uint256 public threshold;
    // current nonce for write functions
    uint256 public nonce;

    // check if the address is one of the validators
    mapping (address => bool) public validators;

    /// @dev Constuctor with chainId / validators / threshold
    /// @param _chainId The chain ID located with
    /// @param _validators Initial validator addresses
    /// @param _threshold Initial threshold to pass the request validation
    constructor(uint32 _chainId, address [] memory _validators, uint256 _threshold) {
        chainId = _chainId;

        for (uint256 i; i < _validators.length; i++) {
            validators[_validators[i]] = true;
        }
        validatorsNum = _validators.length;
        require(_threshold <= validatorsNum, "ERR_INVALID_THRESHOLD");
        threshold = _threshold;
    }

    /* ========== VIEW FUNCTIONS ========== */

    /// @notice Check if there are enough signed signatures to the signature hash
    /// @param sigIdHash The signature hash to be signed
    /// @param signatures Signed signatures by different validators
    function checkSignatures(bytes32 sigIdHash, bytes[] memory signatures) public view {
        require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES");
        address prevAddress = address(0);
        for (uint i; i < threshold; i++) {
            address recovered = sigIdHash.recover(signatures[i]);
            require(validators[recovered], "ERR_NOT_VALIDATOR");
            require(recovered > prevAddress, "ERR_WRONG_SIGNER_ORDER");
            prevAddress = recovered;
        }
    }

    /* ========== WRITE FUNCTIONS ========== */

    /// @notice Change `threshold` by providing a correct nonce and enough signatures from validators
    /// @param _threshold New `threshold`
    /// @param _nonce The nonce to be processed
    /// @param signatures Signed signatures by validators
    function setThreshold(uint256 _threshold, uint256 _nonce, bytes[] memory signatures) external {
        require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES");
        require(_nonce == nonce, "ERR_INVALID_NONCE");
        require(_threshold > 0, "ERR_INVALID_THRESHOLD");
        require(_threshold <= validatorsNum, "ERR_INVALID_THRESHOLD");

        bytes32 sigId = keccak256(abi.encodePacked(SET_THRESHOLD_IDENTIFIER, address(this), chainId, _threshold, _nonce));
        bytes32 sigIdHash = sigId.toEthSignedMessageHash();
        checkSignatures(sigIdHash, signatures);

        threshold = _threshold;
        nonce++;
    }

    /// @notice Set / remove the validator address to be part of signatures committee
    /// @param _validator The address to add or remove
    /// @param flag `true` to add, `false` to remove
    /// @param _nonce The nonce to be processed
    /// @param signatures Signed signatures by validators
    function setValidator(address _validator, bool flag, uint256 _nonce, bytes[] memory signatures) external {
        require(_validator != address(0), "ERR_INVALID_VALIDATOR");
        require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES");
        require(_nonce == nonce, "ERR_INVALID_NONCE");
        require(flag != validators[_validator], "ERR_OPERATION_TO_VALIDATOR");

        bytes32 sigId = keccak256(abi.encodePacked(SET_VALIDATOR_IDENTIFIER, address(this), chainId, _validator, flag, _nonce));
        bytes32 sigIdHash = sigId.toEthSignedMessageHash();
        checkSignatures(sigIdHash, signatures);

        if (validators[_validator]) {
            validatorsNum--;
            validators[_validator] = false;
            if (validatorsNum < threshold) threshold--;
        } else {
            validatorsNum++;
            validators[_validator] = true;
        }
        nonce++;
    }
}

File 16 of 16 : IERC20MintBurnable.sol
// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.2;

import "IERC20.sol";

interface IERC20MintBurnable is IERC20 {

    function mint(address account, uint256 amount) external;

    function burn(uint256 amount) external;
}

Settings
{
  "evmVersion": "istanbul",
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "libraries": {
    "XYCrossChainRelay.sol": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : chainId (uint32): 25
Arg [1] : _treasury (address): 0xEc4f3db7307c741C4bB94ffe5c7c6786A4567870
Arg [2] : _supervisor (address): 0x06907b249FaEEBB6fA5b14d27D4704a0D03Dd590
Arg [3] : owner (address): 0x0132613b3A1061816F4661Ad301612910E3Cce0B
Arg [4] : manager (address): 0x0132613b3A1061816F4661Ad301612910E3Cce0B
Arg [5] : staff (address): 0xCD982cAD5051A6C19414736acd55E39B8C8DCC5c
Arg [6] : _token (address): 0x061E31e7768b39a4282822b65569F8d814dC15f6
Arg [7] : _isPrimitive (bool): False
Arg [8] : _maxCrossChainAmount (uint256): 10000000000000000000000000
Arg [9] : _redeemableTokenName (string): Redeemable Degen Brain Exchange
Arg [10] : _redeemableTokenSymbol (string): Redeemable DBX

-----Encoded View---------------
15 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000019
Arg [1] : 000000000000000000000000ec4f3db7307c741c4bb94ffe5c7c6786a4567870
Arg [2] : 00000000000000000000000006907b249faeebb6fa5b14d27d4704a0d03dd590
Arg [3] : 0000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b
Arg [4] : 0000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b
Arg [5] : 000000000000000000000000cd982cad5051a6c19414736acd55e39b8c8dcc5c
Arg [6] : 000000000000000000000000061e31e7768b39a4282822b65569f8d814dc15f6
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [8] : 000000000000000000000000000000000000000000084595161401484a000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [10] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [11] : 000000000000000000000000000000000000000000000000000000000000001f
Arg [12] : 52656465656d61626c6520446567656e20427261696e2045786368616e676500
Arg [13] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [14] : 52656465656d61626c6520444258000000000000000000000000000000000000


Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.