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0x3e3f619940d9a20DbcF3F7c0c7958f4A67Fac688

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Relay Chain: Deployer at txn 0x41c56d8e596603a3b1f82903803db43972cd2f018ed22a5393be512fbb6d00c3

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Contract Name:

ERC20Handler

Compiler Version

v0.6.4+commit.1dca32f3

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion, None license

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at moonriver.moonscan.io on 2021-12-10
*/

// File: contracts/interfaces/IDepositExecute.sol

pragma solidity 0.6.4;

/**
    @title Interface for handler contracts that support deposits and deposit executions.
    @author ChainSafe Systems.
 */
interface IDepositExecute {
    /**
        @notice It is intended that deposit are made using the Bridge contract.
        @param destinationChainID Chain ID deposit is expected to be bridged to.
        @param depositNonce This value is generated as an ID by the Bridge contract.
        @param depositer Address of account making the deposit in the Bridge contract.
        @param data Consists of additional data needed for a specific deposit.
     */
    function deposit(bytes32 resourceID, uint8 destinationChainID, uint64 depositNonce, address depositer, bytes calldata data) external;

    /**
        @notice It is intended that proposals are executed by the Bridge contract.
        @param data Consists of additional data needed for a specific deposit execution.
     */
    function executeProposal(bytes32 resourceID, bytes calldata data) external;
}

// File: contracts/interfaces/IERC20Handler.sol

pragma solidity 0.6.4;

interface IERC20Handler {
    function setFeePercent(uint256 feePercent) external;
    function setFeePercentTreasury(address newTreasury) external;
}

// File: contracts/interfaces/IERCHandler.sol

pragma solidity 0.6.4;

/**
    @title Interface to be used with handlers that support ERC20s and ERC721s.
    @author ChainSafe Systems.
 */
interface IERCHandler {
    /**
        @notice Correlates {resourceID} with {contractAddress}.
        @param resourceID ResourceID to be used when making deposits.
        @param contractAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function setResource(bytes32 resourceID, address contractAddress) external;
    /**
        @notice Marks {contractAddress} as mintable/burnable.
        @param contractAddress Address of contract to be used when making or executing deposits.
        @param burnable Does the token need to be burnable
     */
    function setBurnable(address contractAddress, bool burnable) external;
    /**
        @notice Used to manually release funds from ERC safes.
        @param tokenAddress Address of token contract to release.
        @param recipient Address to release tokens to.
        @param amountOrTokenID Either the amount of ERC20 tokens or the ERC721 token ID to release.
     */
    function withdraw(address tokenAddress, address recipient, uint256 amountOrTokenID) external;
}

// File: contracts/handlers/HandlerHelpers.sol

pragma solidity 0.6.4;


/**
    @title Function used across handler contracts.
    @author ChainSafe Systems.
    @notice This contract is intended to be used with the Bridge contract.
 */
contract HandlerHelpers is IERCHandler {
    address public _bridgeAddress;

    // resourceID => token contract address
    mapping (bytes32 => address) public _resourceIDToTokenContractAddress;

    // token contract address => resourceID
    mapping (address => bytes32) public _tokenContractAddressToResourceID;

    // token contract address => is whitelisted
    mapping (address => bool) public _contractWhitelist;

    // token contract address => is burnable
    mapping (address => bool) public _burnList;

    modifier onlyBridge() {
        _onlyBridge();
        _;
    }

    function _onlyBridge() private view {
        require(msg.sender == _bridgeAddress, "sender must be bridge contract");
    }

    /**
        @notice First verifies {_resourceIDToContractAddress}[{resourceID}] and
        {_contractAddressToResourceID}[{contractAddress}] are not already set,
        then sets {_resourceIDToContractAddress} with {contractAddress},
        {_contractAddressToResourceID} with {resourceID},
        and {_contractWhitelist} to true for {contractAddress}.
        @param resourceID ResourceID to be used when making deposits.
        @param contractAddress Address of contract to be called when a deposit is made and a deposited is executed.
     */
    function setResource(bytes32 resourceID, address contractAddress) external override onlyBridge {

        _setResource(resourceID, contractAddress);
    }

    /**
        @notice First verifies {contractAddress} is whitelisted, then sets {_burnList}[{contractAddress}]
        to `burnable`.
        @param contractAddress Address of contract to be used when making or executing deposits.
        @param burnable Does the token need to be burnable
     */
    function setBurnable(address contractAddress, bool burnable) external override onlyBridge{
        _setBurnable(contractAddress, burnable);
    }

    /**
        @notice Used to manually release funds from ERC safes.
        @param tokenAddress Address of token contract to release.
        @param recipient Address to release tokens to.
        @param amountOrTokenID Either the amount of ERC20 tokens or the ERC721 token ID to release.
     */
    function withdraw(address tokenAddress, address recipient, uint256 amountOrTokenID) external virtual override {}

    function _setResource(bytes32 resourceID, address contractAddress) internal {
        _resourceIDToTokenContractAddress[resourceID] = contractAddress;
        _tokenContractAddressToResourceID[contractAddress] = resourceID;

        _contractWhitelist[contractAddress] = true;
    }

    function _setBurnable(address contractAddress, bool burnable) internal {
        require(_contractWhitelist[contractAddress], "provided contract is not whitelisted");
        _burnList[contractAddress] = burnable;
    }
}

// File: contracts/ERC20PresetMinterPauser.sol

// File: @openzeppelin/contracts/utils/EnumerableSet.sol

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));
    }
}

// File: @openzeppelin/contracts/utils/Address.sol

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");
    }
}

// File: @openzeppelin/contracts/GSN/Context.sol

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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }

    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;
    }
}

// File: @openzeppelin/contracts/access/AccessControl.sol

pragma solidity ^0.6.0;




/**
 * @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 `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.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        _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());
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

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);
}

// File: @openzeppelin/contracts/math/SafeMath.sol

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) {
        // Solidity only automatically asserts when dividing by 0
        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;
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.6.0;





/**
 * @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 {ERC20MinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string internal _name;
    string internal _symbol;
    uint8 internal _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view 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 {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

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

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

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

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

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

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

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

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

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

        _beforeTokenTransfer(sender, recipient, amount);

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

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

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

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

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

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

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

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

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

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

// File: @openzeppelin/contracts/token/ERC20/ERC20Burnable.sol

pragma solidity ^0.6.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// File: @openzeppelin/contracts/utils/Pausable.sol

pragma solidity ^0.6.0;


/**
 * @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.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

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

    /**
     * @dev Triggers stopped state.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/token/ERC20/ERC20Pausable.sol

pragma solidity ^0.6.0;



/**
 * @dev ERC20 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC20Pausable is ERC20, Pausable {
    /**
     * @dev See {ERC20-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the contract must not be paused.
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        require(!paused(), "ERC20Pausable: token transfer while paused");
    }
}

// File: @openzeppelin/contracts/presets/ERC20PresetMinterPauser.sol

pragma solidity ^0.6.0;






/**
 * @dev {ERC20} token, including:
 *
 *  - ability for holders to burn (destroy) their tokens
 *  - a minter role that allows for token minting (creation)
 *  - a pauser role that allows to stop all token transfers
 *
 * This contract uses {AccessControl} to lock permissioned functions using the
 * different roles - head to its documentation for details.
 *
 * The account that deploys the contract will be granted the minter and pauser
 * roles, as well as the default admin role, which will let it grant both minter
 * and pauser roles to aother accounts
 */
contract ERC20PresetMinterPauser is Context, AccessControl, ERC20Burnable, ERC20Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
     * account that deploys the contract.
     *
     * See {ERC20-constructor}.
     */
    constructor(string memory name, string memory symbol, uint8 decimals) public ERC20(name, symbol) {
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());

        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(PAUSER_ROLE, _msgSender());

        _setupDecimals(decimals);
    }

    /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) public {
        require(hasRole(MINTER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have minter role to mint");
        _mint(to, amount);
    }

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() public {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to pause");
        _pause();
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() public {
        require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to unpause");
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override(ERC20, ERC20Pausable) {
        super._beforeTokenTransfer(from, to, amount);
    }

    function changeNameSymbolDecimals(string memory name, string memory symbol, uint8 decimals) public {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have admin role to edit token name");
        _name = name;
        _symbol = symbol;
        _setupDecimals(decimals);
    }
}

// File: contracts/ERC20Safe.sol

pragma solidity 0.6.4;


/**
    @title Manages deposited ERC20s.
    @author ChainSafe Systems.
    @notice This contract is intended to be used with ERC20Handler contract.
 */
contract ERC20Safe {
    using SafeMath for uint256;

    /**
        @notice Used to transfer tokens into the safe to fund proposals.
        @param tokenAddress Address of ERC20 to transfer.
        @param owner Address of current token owner.
        @param amount Amount of tokens to transfer.
     */
    function fundERC20(address tokenAddress, address owner, uint256 amount) public {
        IERC20 erc20 = IERC20(tokenAddress);
        _safeTransferFrom(erc20, owner, address(this), amount);
    }

    /**
        @notice Used to gain custody of deposited token.
        @param tokenAddress Address of ERC20 to transfer.
        @param owner Address of current token owner.
        @param recipient Address to transfer tokens to.
        @param amount Amount of tokens to transfer.
     */
    function lockERC20(address tokenAddress, address owner, address recipient, uint256 amount) internal {
        IERC20 erc20 = IERC20(tokenAddress);
        _safeTransferFrom(erc20, owner, recipient, amount);
    }

    /**
        @notice Transfers custody of token to recipient.
        @param tokenAddress Address of ERC20 to transfer.
        @param recipient Address to transfer tokens to.
        @param amount Amount of tokens to transfer.
     */
    function releaseERC20(address tokenAddress, address recipient, uint256 amount) internal {
        IERC20 erc20 = IERC20(tokenAddress);
        _safeTransfer(erc20, recipient, amount);
    }

    /**
        @notice Used to create new ERC20s.
        @param tokenAddress Address of ERC20 to transfer.
        @param recipient Address to mint token to.
        @param amount Amount of token to mint.
     */
    function mintERC20(address tokenAddress, address recipient, uint256 amount) internal {
        ERC20PresetMinterPauser erc20 = ERC20PresetMinterPauser(tokenAddress);
        erc20.mint(recipient, amount);

    }

    /**
        @notice Used to burn ERC20s.
        @param tokenAddress Address of ERC20 to burn.
        @param owner Current owner of tokens.
        @param amount Amount of tokens to burn.
     */
    function burnERC20(address tokenAddress, address owner, uint256 amount) internal {
        ERC20Burnable erc20 = ERC20Burnable(tokenAddress);
        erc20.burnFrom(owner, amount);
    }

    /**
        @notice used to transfer ERC20s safely
        @param token Token instance to transfer
        @param to Address to transfer token to
        @param value Amount of token to transfer
     */
    function _safeTransfer(IERC20 token, address to, uint256 value) private {
        _safeCall(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }


    /**
        @notice used to transfer ERC20s safely
        @param token Token instance to transfer
        @param from Address to transfer token from
        @param to Address to transfer token to
        @param value Amount of token to transfer
     */
    function _safeTransferFrom(IERC20 token, address from, address to, uint256 value) private {
        _safeCall(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
        @notice used to make calls to ERC20s safely
        @param token Token instance call targets
        @param data encoded call data
     */
    function _safeCall(IERC20 token, bytes memory data) private {        
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "ERC20: call failed");

        if (returndata.length > 0) {

            require(abi.decode(returndata, (bool)), "ERC20: operation did not succeed");
        }
    }

}

// File: contracts/handlers/ERC20Handler.sol

pragma solidity 0.6.4;
pragma experimental ABIEncoderV2;






/**
    @title Handles ERC20 deposits and deposit executions.
    @author ChainSafe Systems.
    @notice This contract is intended to be used with the Bridge contract.
 */
contract ERC20Handler is IERC20Handler, IDepositExecute, HandlerHelpers, ERC20Safe {
    uint256 public constant MAX_FEE_PERCENT = 10000;
    uint256 public _feePercent = 0;
    address public _percentTreasuryAddress;

    function setFeePercent(uint256 feePercent) external override onlyBridge {
        require(feePercent < MAX_FEE_PERCENT, "feePercent too large");
        _feePercent = feePercent;
    }

    function setFeePercentTreasury(address newTreasury) external override onlyBridge {
        require(newTreasury != address(0), "new treasury is null");
        _percentTreasuryAddress = newTreasury;
    }

    struct DepositRecord {
        address _tokenAddress;
        uint8    _lenDestinationRecipientAddress;
        uint8   _destinationChainID;
        bytes32 _resourceID;
        bytes   _destinationRecipientAddress;
        address _depositer;
        uint    _amount;
    }

    // depositNonce => Deposit Record
    mapping (uint8 => mapping(uint64 => DepositRecord)) public _depositRecords;

    /**
        @param bridgeAddress Contract address of previously deployed Bridge.
        @param initialResourceIDs Resource IDs are used to identify a specific contract address.
        These are the Resource IDs this contract will initially support.
        @param initialContractAddresses These are the addresses the {initialResourceIDs} will point to, and are the contracts that will be
        called to perform various deposit calls.
        @param burnableContractAddresses These addresses will be set as burnable and when {deposit} is called, the deposited token will be burned.
        When {executeProposal} is called, new tokens will be minted.

        @dev {initialResourceIDs} and {initialContractAddresses} must have the same length (one resourceID for every address).
        Also, these arrays must be ordered in the way that {initialResourceIDs}[0] is the intended resourceID for {initialContractAddresses}[0].
     */
    constructor(
        address          bridgeAddress,
        bytes32[] memory initialResourceIDs,
        address[] memory initialContractAddresses,
        address[] memory burnableContractAddresses
    ) public {
        require(initialResourceIDs.length == initialContractAddresses.length,
            "initialResourceIDs and initialContractAddresses len mismatch");

        _bridgeAddress = bridgeAddress;
        _percentTreasuryAddress = bridgeAddress;

        for (uint256 i = 0; i < initialResourceIDs.length; i++) {
            _setResource(initialResourceIDs[i], initialContractAddresses[i]);
        }

        for (uint256 i = 0; i < burnableContractAddresses.length; i++) {
            _setBurnable(burnableContractAddresses[i], true);
        }
    }

    /**
        @param depositNonce This ID will have been generated by the Bridge contract.
        @param destId ID of chain deposit will be bridged to.
        @return DepositRecord which consists of:
        - _tokenAddress Address used when {deposit} was executed.
        - _destinationChainID ChainID deposited tokens are intended to end up on.
        - _resourceID ResourceID used when {deposit} was executed.
        - _lenDestinationRecipientAddress Used to parse recipient's address from {_destinationRecipientAddress}
        - _destinationRecipientAddress Address tokens are intended to be deposited to on desitnation chain.
        - _depositer Address that initially called {deposit} in the Bridge contract.
        - _amount Amount of tokens that were deposited.
    */
    function getDepositRecord(uint64 depositNonce, uint8 destId) external view returns (DepositRecord memory) {
        return _depositRecords[destId][depositNonce];
    }

    /**
        @notice A deposit is initiatied by making a deposit in the Bridge contract.
        @param destinationChainID Chain ID of chain tokens are expected to be bridged to.
        @param depositNonce This value is generated as an ID by the Bridge contract.
        @param depositer Address of account making the deposit in the Bridge contract.
        @param data Consists of: {resourceID}, {amount}, {lenRecipientAddress}, and {recipientAddress}
        all padded to 32 bytes.
        @notice Data passed into the function should be constructed as follows:
        amount                      uint256     bytes   0 - 32
        recipientAddress length     uint256     bytes  32 - 64
        recipientAddress            bytes       bytes  64 - END
        @dev Depending if the corresponding {tokenAddress} for the parsed {resourceID} is
        marked true in {_burnList}, deposited tokens will be burned, if not, they will be locked.
     */
    function deposit(
        bytes32 resourceID,
        uint8   destinationChainID,
        uint64  depositNonce,
        address depositer,
        bytes   calldata data
    ) external override onlyBridge {
        bytes   memory recipientAddress;
        uint256        amount;
        uint256        lenRecipientAddress;

        assembly {

            amount := calldataload(0xC4)

            recipientAddress := mload(0x40)
            lenRecipientAddress := calldataload(0xE4)
            mstore(0x40, add(0x20, add(recipientAddress, lenRecipientAddress)))

            calldatacopy(
                recipientAddress, // copy to destinationRecipientAddress
                0xE4, // copy from calldata @ 0x104
                sub(calldatasize(), 0xE) // copy size (calldatasize - 0x104)
            )
        }

        address tokenAddress = _resourceIDToTokenContractAddress[resourceID];
        require(_contractWhitelist[tokenAddress], "provided tokenAddress is not whitelisted");

        if (_burnList[tokenAddress]) {
            burnERC20(tokenAddress, depositer, amount);
        } else {
            lockERC20(tokenAddress, depositer, address(this), amount);
        }

        _depositRecords[destinationChainID][depositNonce] = DepositRecord(
            tokenAddress,
            uint8(lenRecipientAddress),
            destinationChainID,
            resourceID,
            recipientAddress,
            depositer,
            amount
        );
    }

    /**
        @notice Proposal execution should be initiated when a proposal is finalized in the Bridge contract.
        by a relayer on the deposit's destination chain.
        @param data Consists of {resourceID}, {amount}, {lenDestinationRecipientAddress},
        and {destinationRecipientAddress} all padded to 32 bytes.
        @notice Data passed into the function should be constructed as follows:
        amount                                 uint256     bytes  0 - 32
        destinationRecipientAddress length     uint256     bytes  32 - 64
        destinationRecipientAddress            bytes       bytes  64 - END
     */
    function executeProposal(bytes32 resourceID, bytes calldata data) external override onlyBridge {
        uint256       amount;
        bytes  memory destinationRecipientAddress;

        assembly {
            amount := calldataload(0x64)

            destinationRecipientAddress := mload(0x40)
            let lenDestinationRecipientAddress := calldataload(0x84)
            mstore(0x40, add(0x20, add(destinationRecipientAddress, lenDestinationRecipientAddress)))

            // in the calldata the destinationRecipientAddress is stored at 0xC4 after accounting for the function signature and length declaration
            calldatacopy(
                destinationRecipientAddress, // copy to destinationRecipientAddress
                0x84, // copy from calldata @ 0x84
                sub(calldatasize(), 0x84) // copy size to the end of calldata
            )
        }

        bytes20 recipientAddress;
        address tokenAddress = _resourceIDToTokenContractAddress[resourceID];

        assembly {
            recipientAddress := mload(add(destinationRecipientAddress, 0x20))
        }

        require(_contractWhitelist[tokenAddress], "provided tokenAddress is not whitelisted");

        uint256 feeAmount = amount / MAX_FEE_PERCENT * _feePercent;
        uint256 userAmount = amount.sub(feeAmount);
        if (_burnList[tokenAddress]) {  
            if (feeAmount > 0) mintERC20(tokenAddress, _percentTreasuryAddress, feeAmount);
            mintERC20(tokenAddress, address(recipientAddress), userAmount);
        } else {
            if (feeAmount > 0) releaseERC20(tokenAddress, _percentTreasuryAddress, feeAmount);
            releaseERC20(tokenAddress, address(recipientAddress), userAmount);
        }
    }

    /**
        @notice Used to manually release ERC20 tokens from ERC20Safe.
        @param tokenAddress Address of token contract to release.
        @param recipient Address to release tokens to.
        @param amount The amount of ERC20 tokens to release.
     */
    function withdraw(address tokenAddress, address recipient, uint amount) external override onlyBridge {
        releaseERC20(tokenAddress, recipient, amount);
    }
}

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Contract ABI

API

[{"inputs":[{"internalType":"address","name":"bridgeAddress","type":"address"},{"internalType":"bytes32[]","name":"initialResourceIDs","type":"bytes32[]"},{"internalType":"address[]","name":"initialContractAddresses","type":"address[]"},{"internalType":"address[]","name":"burnableContractAddresses","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"MAX_FEE_PERCENT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_bridgeAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_burnList","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_contractWhitelist","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"","type":"uint8"},{"internalType":"uint64","name":"","type":"uint64"}],"name":"_depositRecords","outputs":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint8","name":"_lenDestinationRecipientAddress","type":"uint8"},{"internalType":"uint8","name":"_destinationChainID","type":"uint8"},{"internalType":"bytes32","name":"_resourceID","type":"bytes32"},{"internalType":"bytes","name":"_destinationRecipientAddress","type":"bytes"},{"internalType":"address","name":"_depositer","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_feePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_percentTreasuryAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"_resourceIDToTokenContractAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"_tokenContractAddressToResourceID","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"uint8","name":"destinationChainID","type":"uint8"},{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"address","name":"depositer","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"executeProposal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"fundERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint64","name":"depositNonce","type":"uint64"},{"internalType":"uint8","name":"destId","type":"uint8"}],"name":"getDepositRecord","outputs":[{"components":[{"internalType":"address","name":"_tokenAddress","type":"address"},{"internalType":"uint8","name":"_lenDestinationRecipientAddress","type":"uint8"},{"internalType":"uint8","name":"_destinationChainID","type":"uint8"},{"internalType":"bytes32","name":"_resourceID","type":"bytes32"},{"internalType":"bytes","name":"_destinationRecipientAddress","type":"bytes"},{"internalType":"address","name":"_depositer","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"internalType":"struct ERC20Handler.DepositRecord","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"bool","name":"burnable","type":"bool"}],"name":"setBurnable","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"feePercent","type":"uint256"}],"name":"setFeePercent","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newTreasury","type":"address"}],"name":"setFeePercentTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"resourceID","type":"bytes32"},{"internalType":"address","name":"contractAddress","type":"address"}],"name":"setResource","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Contract Creation Code

Decompile Bytecode Switch to Opcodes View

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

000000000000000000000000c3a720588d915274b3c81c0bdf473d3ffb279017000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : bridgeAddress (address): 0xc3a720588d915274B3c81c0bDf473D3FFb279017

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000c3a720588d915274b3c81c0bdf473d3ffb279017
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000000

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Swarm Source

ipfs://e71e3297120adcf2b452b018ba4d6902f70540fb40c8bea27bbf3fc8297d608b

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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Multichain Portfolio | 34 Chains

Display all chains •

Last updated: less than 1 sec ago

Chain	Token	Portfolio %	Price	Amount	Value
MOVR	MOONKAFE (KAFE)	83.00%	$0.250283	20,710.8978	$5,183.59
MOVR	Wrapped MOVR (WMOVR)	16.56%	$6.2	166.8076	$1,034.21
MOVR	RivrDoge (RIVRDOGE)	0.44%	$0.000003	10,001,000	$27.6

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.

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