Contract 0x8764DE60236C5843D9faEB1B638fbCE962773B67 5

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xe2f5a92aca8ecf29ad2b57cc915a9ca3a02b63f2d40aa05ab1a7eb5c12c1050bExit518540652022-12-04 4:23:4926 mins ago0x8ed4c09e88a085cc0d91ef12c34fbb8831a12e04 IN  Tomb Finance: Masonry0 FTM0.001613682711
0xd487f2740ede61e050801bfbbaa19f37a98e2810ebbe236342d7bdc3e4eaa439Exit518530882022-12-04 3:48:091 hr 2 mins ago0xf7fc65b17988018c6bd3deca178f626359249383 IN  Tomb Finance: Masonry0 FTM0.001982755393
0xc058055adb5c849b8341fa37393acf1ca3cf7bfd862305aea3c1d76548f6d761Withdraw518498172022-12-04 2:07:212 hrs 42 mins ago0xd2bce74a491ab10e9403e8a3dae873a694cf0237 IN  Tomb Finance: Masonry0 FTM0.001294048229
0x0ca03ca43bd1e45e0e43dd6f26acd477e4416cb3826ea5ef543badbc0edfb5dcClaim Reward518497952022-12-04 2:06:382 hrs 43 mins ago0xd2bce74a491ab10e9403e8a3dae873a694cf0237 IN  Tomb Finance: Masonry0 FTM0.002017953717
0xf71d4523f8775c0d7d2f373ffbaa449a1af9defa48b97c82e5590edbf7e5a8fcStake518464782022-12-04 0:31:284 hrs 18 mins ago0x938a012f36922cdb96bdfcb55329b920b84c7596 IN  Tomb Finance: Masonry0 FTM0.005061142293
0xe7e13ebef5c6e8cb8bf34be75a6ed694624e9aa3850fdf71da13dff9e43a07dbWithdraw518437432022-12-03 22:13:066 hrs 37 mins ago0x8deb77e0a60a1394b0c6bf71752aed4bb6ccfb3a IN  Tomb Finance: Masonry0 FTM0.003357127662
0x7a62dd265bf2c231eaa5d0c7d26f4c43d45e55e1a9365eb33d9e8e26f8dfa9a2Stake518434222022-12-03 21:58:586 hrs 51 mins ago0x191e00e7c55e94853097b7b16db45a04bacc0a14 IN  Tomb Finance: Masonry0 FTM0.001533558148
0x0296ce86fc87f799406c80832ee8c78256a12e3a679a74c5c31bbd0c7e3becb7Withdraw518393942022-12-03 19:42:229 hrs 7 mins ago0x694714e8ea6bb7009e820801ceb98c4faa912595 IN  Tomb Finance: Masonry0 FTM0.002037435795
0x47f3a102990891773d243d23f256fa9ff3f26e82698a36caf00e5d25274bfea4Exit518392562022-12-03 19:36:409 hrs 13 mins ago0x1b16648ac2ffb3feddd4849d5a49c7032adff393 IN  Tomb Finance: Masonry0 FTM0.002730578583
0xa0025ac2c07619953f55c88be3e064e9b79f45c41d876d984cfa37a3ef57d5f6Exit518334192022-12-03 16:52:2411 hrs 57 mins ago0xe13c20a20356a3dac7518c0e30aac27fbcc7dac4 IN  Tomb Finance: Masonry0 FTM0.002372904672
0x2d4e74dd0f8000e29dd61d181a3b80114fa645339fe9d75feface3ca7520d232Exit518277942022-12-03 14:11:1514 hrs 39 mins ago0x098de82050559db54c576bfc4ba553a6af8865df IN  Tomb Finance: Masonry0 FTM0.001633612539
0xc5c3ee7bb79acf2fd8f2c30474ffec682202d2c5b648b9b89ecdf87bdb6a8716Withdraw518230532022-12-03 11:49:1017 hrs 1 min ago0xe35e736d784933b5216e5eb3ce2421029dd46a68 IN  Tomb Finance: Masonry0 FTM0.006628662947
0x6a8805a0fe2429339762edc94d57dcb88ffd20bc6415067684a6118a30f8ff3aStake518217242022-12-03 10:58:0917 hrs 52 mins ago0xad67e8d8c7a86d6db1a847786e0ea6d0b8df5ce2 IN  Tomb Finance: Masonry0 FTM0.003869790902
0x9c3a4520378b482729d81d432f2c83efa94802c74bc4d7b690bce11cede7a053Claim Reward518208172022-12-03 10:29:3218 hrs 20 mins ago0x0ea10ec91c5d5e971cc5d67a04e23732763c310c IN  Tomb Finance: Masonry0 FTM0.001005505716
0x7b7865bdf248f056410e0e2b581959bb5b71938cd69859c3de6efe0381e20559Withdraw518164262022-12-03 8:17:4520 hrs 32 mins ago0xab17af8886267097274a46a8e22fbd9f5b90b7b6 IN  Tomb Finance: Masonry0 FTM0.241704051919
0x08be60bbc0e0daa5e0945d47c0b172e6d24a403c35c16530b308c6a356c5b542Withdraw518164262022-12-03 8:17:4520 hrs 32 mins ago0xab17af8886267097274a46a8e22fbd9f5b90b7b6 IN  Tomb Finance: Masonry0 FTM0.012441863736
0x7c9a782dc824ccca3e3cdd1652ee49ba58d55264d2585f023c0e85bed81bf128Claim Reward518156942022-12-03 7:50:0621 hrs ago0xc5c226b0bea48bebc559f8cd021f21a717042759 IN  Tomb Finance: Masonry0 FTM0.00477293367
0x3bdd5b0b7a94d6541f8042d4d512f987c8f9bb0eee6f02305e86a658a601a0e9Claim Reward518149922022-12-03 7:24:5321 hrs 25 mins ago0xad67e8d8c7a86d6db1a847786e0ea6d0b8df5ce2 IN  Tomb Finance: Masonry0 FTM0.017046027728
0x0ab35723ffffc23671a64c4dc78127e4820f31137ac0013d05a132cdf5c77d26Claim Reward518149922022-12-03 7:24:5321 hrs 25 mins ago0xad67e8d8c7a86d6db1a847786e0ea6d0b8df5ce2 IN  Tomb Finance: Masonry0 FTM0.016448549784
0x2d12a580ab91a4e7a9763da1dbbbc1b04ac0bc52be665da70509757a9a8692b2Claim Reward518149922022-12-03 7:24:5321 hrs 25 mins ago0xad67e8d8c7a86d6db1a847786e0ea6d0b8df5ce2 IN  Tomb Finance: Masonry0 FTM0.001656099779
0x0299bba53b94b10906e7d289bd1f93a6f4ce4c5dfc80c8fd90e2694563c6a0adClaim Reward518118312022-12-03 5:19:5123 hrs 30 mins ago0xcfe530e8a6000f509b65fdd2a619d9dee151eb57 IN  Tomb Finance: Masonry0 FTM0.003334103763
0xa048b1ec0bcfa39a16649cd71a6260c75fb60f6ac8d3fdcdcae21fca80504c1cWithdraw518118242022-12-03 5:19:2323 hrs 30 mins ago0xcfe530e8a6000f509b65fdd2a619d9dee151eb57 IN  Tomb Finance: Masonry0 FTM0.012567123207
0x5bad3aa41d5d7e1d48424ed834d610332a866269c12b4a3ee62052d5838db7cfStake518104982022-12-03 4:14:441 day 35 mins ago0x52bff3793c308b1e9fd02096f52cd59a8bc7042f IN  Tomb Finance: Masonry0 FTM0.003023870264
0x9a8f77318952dfc86ad0cdaf254b6ed6b5efdf5f46a8ca86ed3f5c4cdeda4eb2Withdraw518096072022-12-03 3:35:451 day 1 hr ago0x6d8f91e2b17caa6886295c9304675a9787bbee1e IN  Tomb Finance: Masonry0 FTM0.004655836152
0x9eb9beaf8f474ebdc0b10f45ddc76c0b231a7de61156c01fcfea3ccb99368bbeWithdraw518069962022-12-03 1:59:011 day 2 hrs ago0x2cc8df7d1804a74e8613b7326a2cccbc8b9c7c91 IN  Tomb Finance: Masonry0 FTM0.001201952452
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0xebc9679489ee59512c6d770a898e8899174ee68e1b1d6c32f25b8f1d72f1136893877442021-06-10 23:32:37541 days 5 hrs ago Tomb Finance: Deployer  Contract Creation0 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
Masonry

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion
File 1 of 8 : Masonry.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

import "./utils/ContractGuard.sol";
import "./interfaces/IBasisAsset.sol";
import "./interfaces/ITreasury.sol";

contract ShareWrapper {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 public share;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    function stake(uint256 amount) public virtual {
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        share.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount) public virtual {
        uint256 masonShare = _balances[msg.sender];
        require(masonShare >= amount, "Masonry: withdraw request greater than staked amount");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = masonShare.sub(amount);
        share.safeTransfer(msg.sender, amount);
    }
}

/*
  ______                __       _______
 /_  __/___  ____ ___  / /_     / ____(_)___  ____ _____  ________
  / / / __ \/ __ `__ \/ __ \   / /_  / / __ \/ __ `/ __ \/ ___/ _ \
 / / / /_/ / / / / / / /_/ /  / __/ / / / / / /_/ / / / / /__/  __/
/_/  \____/_/ /_/ /_/_.___/  /_/   /_/_/ /_/\__,_/_/ /_/\___/\___/

    http://tomb.finance
*/
contract Masonry is ShareWrapper, ContractGuard {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;

    /* ========== DATA STRUCTURES ========== */

    struct Masonseat {
        uint256 lastSnapshotIndex;
        uint256 rewardEarned;
        uint256 epochTimerStart;
    }

    struct MasonrySnapshot {
        uint256 time;
        uint256 rewardReceived;
        uint256 rewardPerShare;
    }

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

    // governance
    address public operator;

    // flags
    bool public initialized = false;

    IERC20 public tomb;
    ITreasury public treasury;

    mapping(address => Masonseat) public masons;
    MasonrySnapshot[] public masonryHistory;

    uint256 public withdrawLockupEpochs;
    uint256 public rewardLockupEpochs;

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

    event Initialized(address indexed executor, uint256 at);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardAdded(address indexed user, uint256 reward);

    /* ========== Modifiers =============== */

    modifier onlyOperator() {
        require(operator == msg.sender, "Masonry: caller is not the operator");
        _;
    }

    modifier masonExists {
        require(balanceOf(msg.sender) > 0, "Masonry: The mason does not exist");
        _;
    }

    modifier updateReward(address mason) {
        if (mason != address(0)) {
            Masonseat memory seat = masons[mason];
            seat.rewardEarned = earned(mason);
            seat.lastSnapshotIndex = latestSnapshotIndex();
            masons[mason] = seat;
        }
        _;
    }

    modifier notInitialized {
        require(!initialized, "Masonry: already initialized");
        _;
    }

    /* ========== GOVERNANCE ========== */

    function initialize(
        IERC20 _tomb,
        IERC20 _share,
        ITreasury _treasury
    ) public notInitialized {
        tomb = _tomb;
        share = _share;
        treasury = _treasury;

        MasonrySnapshot memory genesisSnapshot = MasonrySnapshot({time : block.number, rewardReceived : 0, rewardPerShare : 0});
        masonryHistory.push(genesisSnapshot);

        withdrawLockupEpochs = 6; // Lock for 6 epochs (36h) before release withdraw
        rewardLockupEpochs = 3; // Lock for 3 epochs (18h) before release claimReward

        initialized = true;
        operator = msg.sender;
        emit Initialized(msg.sender, block.number);
    }

    function setOperator(address _operator) external onlyOperator {
        operator = _operator;
    }

    function setLockUp(uint256 _withdrawLockupEpochs, uint256 _rewardLockupEpochs) external onlyOperator {
        require(_withdrawLockupEpochs >= _rewardLockupEpochs && _withdrawLockupEpochs <= 56, "_withdrawLockupEpochs: out of range"); // <= 2 week
        withdrawLockupEpochs = _withdrawLockupEpochs;
        rewardLockupEpochs = _rewardLockupEpochs;
    }

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

    // =========== Snapshot getters

    function latestSnapshotIndex() public view returns (uint256) {
        return masonryHistory.length.sub(1);
    }

    function getLatestSnapshot() internal view returns (MasonrySnapshot memory) {
        return masonryHistory[latestSnapshotIndex()];
    }

    function getLastSnapshotIndexOf(address mason) public view returns (uint256) {
        return masons[mason].lastSnapshotIndex;
    }

    function getLastSnapshotOf(address mason) internal view returns (MasonrySnapshot memory) {
        return masonryHistory[getLastSnapshotIndexOf(mason)];
    }

    function canWithdraw(address mason) external view returns (bool) {
        return masons[mason].epochTimerStart.add(withdrawLockupEpochs) <= treasury.epoch();
    }

    function canClaimReward(address mason) external view returns (bool) {
        return masons[mason].epochTimerStart.add(rewardLockupEpochs) <= treasury.epoch();
    }

    function epoch() external view returns (uint256) {
        return treasury.epoch();
    }

    function nextEpochPoint() external view returns (uint256) {
        return treasury.nextEpochPoint();
    }

    function getTombPrice() external view returns (uint256) {
        return treasury.getTombPrice();
    }

    // =========== Mason getters

    function rewardPerShare() public view returns (uint256) {
        return getLatestSnapshot().rewardPerShare;
    }

    function earned(address mason) public view returns (uint256) {
        uint256 latestRPS = getLatestSnapshot().rewardPerShare;
        uint256 storedRPS = getLastSnapshotOf(mason).rewardPerShare;

        return balanceOf(mason).mul(latestRPS.sub(storedRPS)).div(1e18).add(masons[mason].rewardEarned);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stake(uint256 amount) public override onlyOneBlock updateReward(msg.sender) {
        require(amount > 0, "Masonry: Cannot stake 0");
        super.stake(amount);
        masons[msg.sender].epochTimerStart = treasury.epoch(); // reset timer
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public override onlyOneBlock masonExists updateReward(msg.sender) {
        require(amount > 0, "Masonry: Cannot withdraw 0");
        require(masons[msg.sender].epochTimerStart.add(withdrawLockupEpochs) <= treasury.epoch(), "Masonry: still in withdraw lockup");
        claimReward();
        super.withdraw(amount);
        emit Withdrawn(msg.sender, amount);
    }

    function exit() external {
        withdraw(balanceOf(msg.sender));
    }

    function claimReward() public updateReward(msg.sender) {
        uint256 reward = masons[msg.sender].rewardEarned;
        if (reward > 0) {
            require(masons[msg.sender].epochTimerStart.add(rewardLockupEpochs) <= treasury.epoch(), "Masonry: still in reward lockup");
            masons[msg.sender].epochTimerStart = treasury.epoch(); // reset timer
            masons[msg.sender].rewardEarned = 0;
            tomb.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    function allocateSeigniorage(uint256 amount) external onlyOneBlock onlyOperator {
        require(amount > 0, "Masonry: Cannot allocate 0");
        require(totalSupply() > 0, "Masonry: Cannot allocate when totalSupply is 0");

        // Create & add new snapshot
        uint256 prevRPS = getLatestSnapshot().rewardPerShare;
        uint256 nextRPS = prevRPS.add(amount.mul(1e18).div(totalSupply()));

        MasonrySnapshot memory newSnapshot = MasonrySnapshot({
            time: block.number,
            rewardReceived: amount,
            rewardPerShare: nextRPS
        });
        masonryHistory.push(newSnapshot);

        tomb.safeTransferFrom(msg.sender, address(this), amount);
        emit RewardAdded(msg.sender, amount);
    }

    function governanceRecoverUnsupported(IERC20 _token, uint256 _amount, address _to) external onlyOperator {
        // do not allow to drain core tokens
        require(address(_token) != address(tomb), "tomb");
        require(address(_token) != address(share), "share");
        _token.safeTransfer(_to, _amount);
    }
}

File 2 of 8 : IBasisAsset.sol
pragma solidity ^0.6.0;

interface IBasisAsset {
    function mint(address recipient, uint256 amount) external returns (bool);

    function burn(uint256 amount) external;

    function burnFrom(address from, uint256 amount) external;

    function isOperator() external returns (bool);

    function operator() external view returns (address);

    function transferOperator(address newOperator_) external;
}

File 3 of 8 : ITreasury.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface ITreasury {
    function epoch() external view returns (uint256);

    function nextEpochPoint() external view returns (uint256);

    function getTombPrice() external view returns (uint256);

    function buyBonds(uint256 amount, uint256 targetPrice) external;

    function redeemBonds(uint256 amount, uint256 targetPrice) external;
}

File 4 of 8 : ContractGuard.sol
pragma solidity 0.6.12;

contract ContractGuard {
    mapping(uint256 => mapping(address => bool)) private _status;

    function checkSameOriginReentranted() internal view returns (bool) {
        return _status[block.number][tx.origin];
    }

    function checkSameSenderReentranted() internal view returns (bool) {
        return _status[block.number][msg.sender];
    }

    modifier onlyOneBlock() {
        require(!checkSameOriginReentranted(), "ContractGuard: one block, one function");
        require(!checkSameSenderReentranted(), "ContractGuard: one block, one function");

        _;

        _status[block.number][tx.origin] = true;
        _status[block.number][msg.sender] = true;
    }
}

File 5 of 8 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * 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);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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 6 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 7 of 8 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/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 SafeMath for uint256;
    using Address for address;

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

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

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

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

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

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

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

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

pragma solidity >=0.6.2 <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;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"executor","type":"address"},{"indexed":false,"internalType":"uint256","name":"at","type":"uint256"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardPaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"allocateSeigniorage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"mason","type":"address"}],"name":"canClaimReward","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"mason","type":"address"}],"name":"canWithdraw","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"mason","type":"address"}],"name":"earned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"epoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"exit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"mason","type":"address"}],"name":"getLastSnapshotIndexOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTombPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_to","type":"address"}],"name":"governanceRecoverUnsupported","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_tomb","type":"address"},{"internalType":"contract IERC20","name":"_share","type":"address"},{"internalType":"contract ITreasury","name":"_treasury","type":"address"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initialized","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestSnapshotIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"masonryHistory","outputs":[{"internalType":"uint256","name":"time","type":"uint256"},{"internalType":"uint256","name":"rewardReceived","type":"uint256"},{"internalType":"uint256","name":"rewardPerShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"masons","outputs":[{"internalType":"uint256","name":"lastSnapshotIndex","type":"uint256"},{"internalType":"uint256","name":"rewardEarned","type":"uint256"},{"internalType":"uint256","name":"epochTimerStart","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nextEpochPoint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"operator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardLockupEpochs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardPerShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_withdrawLockupEpochs","type":"uint256"},{"internalType":"uint256","name":"_rewardLockupEpochs","type":"uint256"}],"name":"setLockUp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_operator","type":"address"}],"name":"setOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"share","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tomb","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"contract ITreasury","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawLockupEpochs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Validator ID :
0 FTM

Amount Staked
0

Amount Delegated
0

Staking Total
0

Staking Start Epoch
0

Staking Start Time
0

Proof of Importance
0

Origination Score
0

Validation Score
0

Active
0

Online
0

Downtime
0 s
Address Amount claimed Rewards Created On Epoch Created On
Block Uncle Number Difficulty Gas Used Reward
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