Contract 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 9

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x6e69312ea5eca37b037f689eef4b7a3060b78bc3e650338a606d42284879dcd2Approve1739060892024-01-25 3:27:5088 days 22 hrs ago0x1cb0059efb3294eb7f8747ca808a196154555563 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000025470.1
0x44c4fe07f3202fe2c957ac34cc612739dff74b34dedd7fbab1c02cb479b6abd1Approve1728337352024-01-21 23:45:2692 days 1 hr ago0xaa2d91bb050c99237d51a33958f1efdc1cabb52b IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000032270.1
0x2757e4aa6d78aae195202f88a68b9d19c799ce232c8d79be22e54b3c02c31165Approve1533434672023-11-23 17:46:32151 days 7 hrs ago0x2ef9ebf18c2108f2b8a8b01db5bd633f2ce202c6 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.0000810.1
0x6a023d2220dc99eea474d68571db01047f770f4ea1ac9d9088aa2080cec9225dApprove1269039492023-09-01 3:51:54234 days 21 hrs ago0xf059b59bdbec91d83c558b4a3cd3c1c6e275f2f1 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00002537 0.1
0x6927f2e756d9410d7f7b3cf6e117a0d4d3fc06091263764c8a7c0b9391088215Withdraw All1205641822023-08-12 4:48:04254 days 20 hrs ago0x1a162a5fdaebb0113f7b83ed87a43bcf0b6a4d1e IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000030670.1
0x71e422f2d8fcb31a1da2b9b36cd1ddf65d83e0859c77afb10e87996000728311Approve1164712902023-07-30 15:58:55267 days 9 hrs ago0xc7bfb2ed20d14407c78cc1fc4a4abe39f1964964 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00003683 0.1
0xc787229dc4bf466677785b88840860367117a4827fc1bfedd594ffaa67cd0b72Withdraw1142397502023-07-23 20:30:30274 days 5 hrs ago0x1a162a5fdaebb0113f7b83ed87a43bcf0b6a4d1e IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000059890.1
0x88a23e028008a6510c3f21bf97e1770807a979079288b470e4a643fa88600d14Transfer1142368932023-07-23 20:17:59274 days 5 hrs ago0xd72b821a1d9180ffac4375f6f11142211a025657 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000059570.1
0x1e1cff2169e442a2a5218bc694a26bd9500046c212d572521c1c487f6ebd0f8dApprove1011415402023-06-14 17:02:57313 days 8 hrs ago0x55760dc6abb6519d9dc7b03aadde38cf51f3d3cc IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00005222 0.1
0xe20bda9ffee7ca7610393f07368d7ba63b9f01d1afc117d31151fe0c4a976c6eApprove1001673312023-06-11 20:06:37316 days 5 hrs ago0x8d85114de0e28d55ccc33162b265a2dcdffa3cc8 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.0000320.1
0x57113c6b98f02e535522b72089b8e945b718652d164dfc6f8271825cd1ab28daTransfer988096282023-06-07 19:23:01320 days 6 hrs ago0x1a162a5fdaebb0113f7b83ed87a43bcf0b6a4d1e IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000046940.1
0x40b27f643c6528c2f707edad289252ae430c4c458398f5572f4e492d1adcb038Approve881475272023-05-07 6:19:20351 days 19 hrs ago0x3d7ebe72e6c787434d98846516bb9ab7fa160ebf IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000137560.1
0x74a558f941d8b0826d21f83bd4df6414e730ac98a75d22415a6f8b6a66009368Withdraw All843522722023-04-26 3:09:10362 days 22 hrs ago0x24308b0114f46a3c523a581fc95c376b06533c44 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00005318 0.1
0xbb37308e52b8d4e9db833b74c6998ef96ec90d8f3254fed5903657ed65ba501eApprove833238912023-04-23 2:48:27365 days 22 hrs ago0x825b132e230c021644a636dc093f74a26891b9c2 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00006119 0.1
0xffa8297bdfdc5789da4409e1468e7da06057d6d2863fcbbf18455e106b6cb84dApprove805674262023-04-15 2:48:46373 days 22 hrs ago0x508baee20854c6b0b001b278c62644a51a66daba IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00003978 0.1
0x59a7112747fb74b20a6f9088c754993998e265818e3db1ea37adfbeb141e4f2bApprove790126852023-04-10 13:32:04378 days 12 hrs ago0xc7d319685db275847334c7cd1acda39730b8f73d IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004507 0.1
0x11b4e5c1fa58727f08191a680307385d6884fbf2bc31d7c790870b710fc25e0fApprove786024602023-04-09 8:46:32379 days 16 hrs ago0xc2d807ac7a419708182457c84b0abce618967d0b IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004113 0.1
0x9ee12f161e0b91294df819aa3cc1962e44e12ef6ef22527d1263e5113a1fa960Approve783170592023-04-08 12:35:43380 days 12 hrs ago0xc074887d140e276a8b892222f925440eaf3ff40b IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004176 0.1
0x30d3f87b0bbd8096a22775e5d6aabfb584b6493fd8724a97e2e8a8c386e5c978Withdraw All761451722023-04-02 3:42:56386 days 21 hrs ago0xa28c928c7c9fea1faaf1f5aed5a6e6241c5ea3b3 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00003582 0.1
0x90ea900f232e11aec56714c4cc44261976b722a1d287ab9b53f4f3c66b84dcf2Withdraw All757426812023-03-31 23:00:15388 days 2 hrs ago0x753343055abc6bfa09fe6403a1ab2c7dc5d02a30 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004527 0.1
0x5b6179a666bcd2ca6cfc8153685710ccc418eb98e22b8d78e05c4a0fc4de79dbWithdraw All754526372023-03-31 2:43:37388 days 22 hrs ago0x25037808ff1fdb04e07d286f25e6c629a34c1eec IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004499 0.1
0x6629558660eb4ba0b80617eed05f28b02644feda2b6c64ac12c354ffacb87eb2Withdraw All753875292023-03-30 22:05:08389 days 3 hrs ago0xe49a583aed77227ea13967f6d0c3cb9ac82034fc IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.000051570.1
0x0c0fdf7cb131d8d86646328f0a9dbf9ca17c8821ab8b784f7a853e324d275ff0Withdraw All753422652023-03-30 18:55:14389 days 6 hrs ago0x95c3f3f5f805e604462dfd51fbea5330f5963b35 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004914 0.1
0x824fb2ca5ade71bdeafac3d75b6bb25b1355dc7f624b970ab9621c5265e87226Withdraw All751354542023-03-30 4:39:52389 days 20 hrs ago0x989bce80c8fbbd82ad91abbaa624629625438624 IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004701 0.1
0xc6fd87d2547201e7f2eb4a927eefc003d38aa1ea6e3669631fa05e9a9ef2f670Withdraw All751326602023-03-30 4:28:17389 days 21 hrs ago0x9c9c48adc52d9ce7f7147b50835b0ee61afc25ec IN  0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH0.00004656 0.1
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Latest 25 internal transaction
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0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x12c7f2748e8ad9af7f608eb64ba58d623e1f93e9efdba324a867c4d4c586e5bf720859822023-03-21 10:15:59398 days 15 hrs ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0x34f532939e347726aa7fbbb2268a1a6a598fb5bbd2c074befc74d447c5343319720838692023-03-21 10:07:10398 days 15 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x01f89316a774ba0400591fab6a9ae30d29fd3b7d0 ETH
0xe0c367fc28150f9edff9e747d4879742be814757c156009e1ac69a686d776e4a719866442023-03-21 3:26:49398 days 22 hrs ago 0xc14844ac5c0e7e96f678c75308d3fde1fa36e22f 0x24704aff49645d32655a76df6d407e02d146dafc0 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xfcdd5a02c611ba6fe2802f885281500ec95805d7
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
BeefyVaultV6

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Arbiscan.io on 2021-09-20
*/

// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/utils/Context.sol


pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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


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: @openzeppelin/contracts/math/SafeMath.sol


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


pragma solidity >=0.6.0 <0.8.0;




/**
 * @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 {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin 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;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _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 virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 virtual returns (uint8) {
        return _decimals;
    }

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

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

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

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

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

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


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);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol


pragma solidity >=0.6.0 <0.8.0;




/**
 * @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: @openzeppelin/contracts/access/Ownable.sol


pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// File: contracts/BIFI/interfaces/beefy/IStrategy.sol


pragma solidity ^0.6.0;


interface IStrategy {
    function vault() external view returns (address);
    function want() external view returns (IERC20);
    function beforeDeposit() external;
    function deposit() external;
    function withdraw(uint256) external;
    function balanceOf() external view returns (uint256);
    function balanceOfWant() external view returns (uint256);
    function balanceOfPool() external view returns (uint256);
    function harvest() external;
    function retireStrat() external;
    function panic() external;
    function pause() external;
    function unpause() external;
    function paused() external view returns (bool);
    function unirouter() external view returns (address);
}

// File: contracts/BIFI/vaults/BeefyVaultV6.sol


pragma solidity ^0.6.0;







/**
 * @dev Implementation of a vault to deposit funds for yield optimizing.
 * This is the contract that receives funds and that users interface with.
 * The yield optimizing strategy itself is implemented in a separate 'Strategy.sol' contract.
 */
contract BeefyVaultV6 is ERC20, Ownable, ReentrancyGuard {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    struct StratCandidate {
        address implementation;
        uint proposedTime;
    }

    // The last proposed strategy to switch to.
    StratCandidate public stratCandidate;
    // The strategy currently in use by the vault.
    IStrategy public strategy;
    // The minimum time it has to pass before a strat candidate can be approved.
    uint256 public immutable approvalDelay;

    event NewStratCandidate(address implementation);
    event UpgradeStrat(address implementation);

    /**
     * @dev Sets the value of {token} to the token that the vault will
     * hold as underlying value. It initializes the vault's own 'moo' token.
     * This token is minted when someone does a deposit. It is burned in order
     * to withdraw the corresponding portion of the underlying assets.
     * @param _strategy the address of the strategy.
     * @param _name the name of the vault token.
     * @param _symbol the symbol of the vault token.
     * @param _approvalDelay the delay before a new strat can be approved.
     */
    constructor (
        IStrategy _strategy,
        string memory _name,
        string memory _symbol,
        uint256 _approvalDelay
    ) public ERC20(
        _name,
        _symbol
    ) {
        strategy = _strategy;
        approvalDelay = _approvalDelay;
    }

    function want() public view returns (IERC20) {
        return IERC20(strategy.want());
    }

    /**
     * @dev It calculates the total underlying value of {token} held by the system.
     * It takes into account the vault contract balance, the strategy contract balance
     *  and the balance deployed in other contracts as part of the strategy.
     */
    function balance() public view returns (uint) {
        return want().balanceOf(address(this)).add(IStrategy(strategy).balanceOf());
    }

    /**
     * @dev Custom logic in here for how much the vault allows to be borrowed.
     * We return 100% of tokens for now. Under certain conditions we might
     * want to keep some of the system funds at hand in the vault, instead
     * of putting them to work.
     */
    function available() public view returns (uint256) {
        return want().balanceOf(address(this));
    }

    /**
     * @dev Function for various UIs to display the current value of one of our yield tokens.
     * Returns an uint256 with 18 decimals of how much underlying asset one vault share represents.
     */
    function getPricePerFullShare() public view returns (uint256) {
        return totalSupply() == 0 ? 1e18 : balance().mul(1e18).div(totalSupply());
    }

    /**
     * @dev A helper function to call deposit() with all the sender's funds.
     */
    function depositAll() external {
        deposit(want().balanceOf(msg.sender));
    }

    /**
     * @dev The entrypoint of funds into the system. People deposit with this function
     * into the vault. The vault is then in charge of sending funds into the strategy.
     */
    function deposit(uint _amount) public nonReentrant {
        strategy.beforeDeposit();

        uint256 _pool = balance();
        want().safeTransferFrom(msg.sender, address(this), _amount);
        earn();
        uint256 _after = balance();
        _amount = _after.sub(_pool); // Additional check for deflationary tokens
        uint256 shares = 0;
        if (totalSupply() == 0) {
            shares = _amount;
        } else {
            shares = (_amount.mul(totalSupply())).div(_pool);
        }
        _mint(msg.sender, shares);
    }

    /**
     * @dev Function to send funds into the strategy and put them to work. It's primarily called
     * by the vault's deposit() function.
     */
    function earn() public {
        uint _bal = available();
        want().safeTransfer(address(strategy), _bal);
        strategy.deposit();
    }

    /**
     * @dev A helper function to call withdraw() with all the sender's funds.
     */
    function withdrawAll() external {
        withdraw(balanceOf(msg.sender));
    }

    /**
     * @dev Function to exit the system. The vault will withdraw the required tokens
     * from the strategy and pay up the token holder. A proportional number of IOU
     * tokens are burned in the process.
     */
    function withdraw(uint256 _shares) public {
        uint256 r = (balance().mul(_shares)).div(totalSupply());
        _burn(msg.sender, _shares);

        uint b = want().balanceOf(address(this));
        if (b < r) {
            uint _withdraw = r.sub(b);
            strategy.withdraw(_withdraw);
            uint _after = want().balanceOf(address(this));
            uint _diff = _after.sub(b);
            if (_diff < _withdraw) {
                r = b.add(_diff);
            }
        }

        want().safeTransfer(msg.sender, r);
    }

    /** 
     * @dev Sets the candidate for the new strat to use with this vault.
     * @param _implementation The address of the candidate strategy.  
     */
    function proposeStrat(address _implementation) public onlyOwner {
        require(address(this) == IStrategy(_implementation).vault(), "Proposal not valid for this Vault");
        stratCandidate = StratCandidate({
            implementation: _implementation,
            proposedTime: block.timestamp
         });

        emit NewStratCandidate(_implementation);
    }

    /** 
     * @dev It switches the active strat for the strat candidate. After upgrading, the 
     * candidate implementation is set to the 0x00 address, and proposedTime to a time 
     * happening in +100 years for safety. 
     */

    function upgradeStrat() public onlyOwner {
        require(stratCandidate.implementation != address(0), "There is no candidate");
        require(stratCandidate.proposedTime.add(approvalDelay) < block.timestamp, "Delay has not passed");

        emit UpgradeStrat(stratCandidate.implementation);

        strategy.retireStrat();
        strategy = IStrategy(stratCandidate.implementation);
        stratCandidate.implementation = address(0);
        stratCandidate.proposedTime = 5000000000;

        earn();
    }

    /**
     * @dev Rescues random funds stuck that the strat can't handle.
     * @param _token address of the token to rescue.
     */
    function inCaseTokensGetStuck(address _token) external onlyOwner {
        require(_token != address(want()), "!token");

        uint256 amount = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransfer(msg.sender, amount);
    }
}

Contract ABI

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IStrategy","name":"_strategy","type":"address"},{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint256","name":"_approvalDelay","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"implementation","type":"address"}],"name":"NewStratCandidate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"implementation","type":"address"}],"name":"UpgradeStrat","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"approvalDelay","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"available","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"depositAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"earn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getPricePerFullShare","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"inCaseTokensGetStuck","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_implementation","type":"address"}],"name":"proposeStrat","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stratCandidate","outputs":[{"internalType":"address","name":"implementation","type":"address"},{"internalType":"uint256","name":"proposedTime","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"strategy","outputs":[{"internalType":"contract IStrategy","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"upgradeStrat","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"want","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_shares","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAll","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Metadata Hash

0703f32ebb7a8ed9a4e39ffa1e65b8cbfbf32f5b47c60ffb8d968ad40332fb25
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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