Contract 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 11

 

Contract Overview

Balance:
0 ETH

EtherValue:
$0.00

Token:
Txn Hash Method
Block
From
To
Value
0x2bc886ee18857f60b8d3726b5ccb83e1169621dacdddea7e666ccc01fa634650Approve1177976102024-03-23 11:39:575 days 20 hrs ago0x99daaf637e697c53afaa67d6ff27e336db925812 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000001882020.005572355
0x25d13a6bec1cfcf35e312fc34eb1e3b112e71c764c00382b1c9c0dd45eddc877Approve1177568542024-03-22 13:01:256 days 19 hrs ago0xa016b59cea666f53da4da3c9f99b97da1e0b016b IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.000000242990.006476879
0x4e5a24df6745bdfd3e593c451eefea94fff09cab858d9bd81047c52d1cbf33eeApprove1177549702024-03-22 11:58:376 days 20 hrs ago0xa016b59cea666f53da4da3c9f99b97da1e0b016b IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000002747220.007562648
0xbc1ac5728e91f22cf854fc7e885b8c42cd6ae865093da35933d7cfd3676ddaebWithdraw All1153399812024-01-26 14:18:5962 days 18 hrs ago0x3351b913d9b37abbbfc057224aa38547f485cbed IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000327429420.0053881
0xa57fab2985c3019c0135b572e7af56c566b262ecf5b6c9724d09ffe9833408b1Approve1149938742024-01-18 14:02:0570 days 18 hrs ago0xa8f30bd1165057f81c7b6629e2501e428f4691f2 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000476029770.004710561
0x3ffc5afbe4569fb1e731c061e4cd04c222659f7d2bda85f5565e879cde572d6bWithdraw All1145283552024-01-07 19:24:4781 days 12 hrs ago0x2cb98276b0ca6f9258d110100c61834434a37d30 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000667381540.007113901
0x00897634c13b00f3265180b7079a35d4a74c41b27154ad567dd90d166cf431c9Approve1138876612023-12-23 23:28:1996 days 8 hrs ago0xb0f8b4b366265cb4c3964e1d7af4d2751f2c28c5 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.000035450450.005345298
0x3efcb96b68ea45a1df94e0ec5f40bff07e645856639b34793aa5c14c7f4a3d8bApprove1135549302023-12-16 6:37:17104 days 1 hr ago0xe2e032ae268d39dc6963624bd0552eeafb43f2d6 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000919688260.006809439
0x0b953871e4162b838d68719615a2ded62c9d448369c1dde714c5b66ddc8bd3ccWithdraw All1133997242023-12-12 16:23:45107 days 15 hrs ago0xdcd87893fdb49789de78329da7012672e1dff735 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000873594940.020218
0x01b942f5026e2739e404caff3e3e28a457a1783b239619e1af328e518291961fApprove1128262912023-11-29 9:49:19120 days 22 hrs ago0x13abf9062237ec43ebd596fb2f475c418fc2b4b7 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000507836560.009148656
0xfdd73b981bb9f0f3645f3ac76bf7942c8341b05979db6e46bc3234ade48bdabfApprove1121130982023-11-12 21:36:13137 days 10 hrs ago0x9c57027b1eca93093a6f446422c59c85a5a3fa52 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000549654270.010435076
0x23d2bdf12c8bf058639398343e60710351ef8c21d8639c68967977c282120083Withdraw All1120179232023-11-10 16:43:43139 days 15 hrs ago0x43fc49753730e7ee5d9f5d39ddc1ac0a2d21ae8b IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000810140660.008950166
0x94f2c3ec4754c305938b5d7ae6d1061cadb3fea65878d621d5484769e03b87dcApprove1118124372023-11-05 22:34:11144 days 9 hrs ago0x1bca3e8c3e0b452c0d03d6f1fa58f500fc3c66f6 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000338209820.112526567
0x4cfbbac44abec7d5a1483b3cbf751ae4c9e27cac6a00d6f4df9a00197f51495dApprove1106381672023-10-09 18:11:51171 days 14 hrs ago0x43a0246156760f64cddc8c275b9196dadbcd1689 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000221316230.123123
0x3a3eab07ce06dbe37c693a624c61c470f90032eb7bcaeb647ff8d3e7223a175cWithdraw All1105159442023-10-06 22:17:45174 days 10 hrs ago0xdce67627665565f2d5db2f6aa5b1a1192048b493 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000712171690.116853312
0x9cd7f1586e221c4f10c9356487d2e45a119bf6474bc6ad158334e1e17401536aApprove1102415562023-09-30 13:51:29180 days 18 hrs ago0xa250155d36fe550d2c3c7a7a61b9a97c3ccffd68 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000272509610.129955996
0xc98e3b0bb092f83093be5d8fd7ce1a39088cda3f494a639f1d533b3a8491f64cWithdraw All1101467392023-09-28 9:10:55182 days 23 hrs ago0x9c57027b1eca93093a6f446422c59c85a5a3fa52 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000331538890.04825735
0xea4e1f0e11836c40f459bd8e261808e4edbc3b9e46d051923fdc1d3c5c0a67a3Withdraw All1100233442023-09-25 12:37:45185 days 19 hrs ago0x68db64a8cc0aea50b479bdd5bc3b3dd5e5821ed4 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000477643860.0698439
0xd1086adcff9993c39e2e86f843a510d827d7532abe3df7ce2bc2bb5bec8370ddWithdraw All1096339942023-09-16 12:19:25194 days 20 hrs ago0xef488766d68bbcb84afc53847c381dcb28db7e74 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0001942712090.406323834
0xf052f1838a2e4ad34719587262497d0c788378bb97b60f83e56166fc067a375fWithdraw All1095590552023-09-14 18:41:27196 days 13 hrs ago0x322623a29dd3f5e23aa28e434ce0711902aa0a1b IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000763202560.100000081
0xd1480173a823180a3751496a191f6c1cdf8f7e3c2dfd6ffeaadbab2101b2eab4Approve1090166342023-09-02 5:20:45209 days 3 hrs ago0x94cca8143fa05c42804e14e290e75bf0fb26c7b8 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000178764130.000000071
0xe490284f306c332dd33d28841ae1d4d2aa7d58ade439a48218f36f55bb1a177aApprove1089484352023-08-31 15:27:27210 days 16 hrs ago0x20cd51b97d135eee334a8f5169f45bbe7921670a IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000547370460.0700001
0xd469122a7c1e50a6981d28e13b3d654429b4452c1e8b41f6ae804b54dc3d38bfWithdraw All1087427992023-08-26 21:12:55215 days 11 hrs ago0x51c93cfb6aff13ef8dfa6de3637d29fff5734189 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000147133340.001
0x9ab529d9350b6cfc67686fda23b5a80dfdc31a548f5c41ff37d9fc81b870fed0Approve1084490232023-08-20 2:00:23222 days 6 hrs ago0x6fd6b8b675d42d3f3c306c07065cd9e5f8435be0 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.000018566560.001
0x47b73944c4338b2aefbaf6cd78d5dffaaf9416ed2dd82f2878451a76bf9d989cApprove1083893352023-08-18 16:50:47223 days 15 hrs ago0x7ad502764eec17de82f5c6bfdc70ceede354a180 IN  0x01d9cfb8a9d43013a1fdc925640412d8d2d900f00 ETH0.0000490790820.00000012
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0x9177b54bf4937ee85cfdfa14d29b0fbb6b4cd707cc1fa5bab283651160ef278e1074689882023-07-28 9:32:33244 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xe1791477403f6a458c93545bbcf62789d675a46626881ffa6646c2824da397f41072527582023-07-23 9:24:53249 days 22 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xce54ccc40236e9a549306dac1c5b148b4d172b4007999857a41a8a2b5d8c54e31072297562023-07-22 20:38:09250 days 11 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xce54ccc40236e9a549306dac1c5b148b4d172b4007999857a41a8a2b5d8c54e31072297562023-07-22 20:38:09250 days 11 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xce54ccc40236e9a549306dac1c5b148b4d172b4007999857a41a8a2b5d8c54e31072297562023-07-22 20:38:09250 days 11 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd62c9d8a3d4fd98b27caaefe3571782a3af0a7370 ETH
0xce54ccc40236e9a549306dac1c5b148b4d172b4007999857a41a8a2b5d8c54e31072297562023-07-22 20:38:09250 days 11 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
0xce54ccc40236e9a549306dac1c5b148b4d172b4007999857a41a8a2b5d8c54e31072297562023-07-22 20:38:09250 days 11 hrs ago 0x01d9cfb8a9d43013a1fdc925640412d8d2d900f0 0xd5c954b23dfdd53d62f94d8d02e784a5062c1ef00 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x2232455bf4622002c1416153ee59fd32b239863b
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 Optimistic.Etherscan.io on 2022-07-06
*/

// 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 Security Audit

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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Swarm Source

ipfs://08ca30a528977091b1539e738b5ad432aa23de91a01c8ad7bb9046a747c9a6d7
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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