Contract 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 3

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x76fe50ed3a023186497662d41fa8cff09bfb754b344d3b1975f3dff2fa017646Withdraw All279786412022-10-02 11:36:361 day 5 hrs ago0xa87b48bfea82465c99a856b588f8bf57f98706d8 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00045155
0xb6caadaa8025992dea682014225e40a620e1d73addf3b8d69aba7e3b9b36c8c6Deposit All278846752022-10-02 2:43:451 day 14 hrs ago0x9322c6ccbce9fcc9bdc45fe2830704907330454d IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00132236
0x83978cdfc992ee496c583568f7210f5fd8f554e24d252150054666d7354d01f7Deposit All277642292022-10-01 11:12:512 days 5 hrs ago0x46331769a8a01947e07c310704893076a3409d36 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00131871
0xb30b7d2b4b93496c01d98e2631db1fcba3a2138e482979f68f796d8a3156f255Deposit All276243662022-09-30 15:06:083 days 1 hr ago0xc5a4372e725f018d52fab6912ded25206eea64f2 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00147055
0x5e5cea58e3438acb0d3f75e8bd6d675eafe1ac7614646d5274ece2374a512ce0Deposit All276240732022-09-30 15:04:313 days 1 hr ago0x8d89f30988fe8ec7356b56f2c82a2d869dea6232 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009341
0x0c583ee0588da3be96b070ca341569723166e2f0a2e170ba4528be91ef5dd1a7Deposit All276238522022-09-30 15:03:043 days 1 hr ago0x81fa436f16f02c80147b318eb7f6ea0bd646deba IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00146735
0xe188b2624f261a4c72606407a08a1e74421c294868ef8185a6a15deda21f8d7fDeposit All276236272022-09-30 15:01:493 days 1 hr ago0x3cb819f91f2b1815c74cce991d92e4dd2d4fea80 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00147055
0x286659a1e6dc5ba12c75712c00050270f873d3c9d66a998f39ce114034c38282Deposit All276233562022-09-30 15:00:413 days 1 hr ago0x575ccbeb658f6752e766d15fd754e43e18ca5305 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00150239
0x44e0fa703b112b1626a28c3262d59ea90ab762bcb8acbc5c2dde0012cf76c449Deposit All276230732022-09-30 14:59:183 days 1 hr ago0x2ab4f41663e5f14021cb2a14e92f4c094e09d7f7 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009086
0x4a3ff79304e61333176cea3baa1bf17d2c438e5052b8375dd68b5e553f833205Deposit All276226792022-09-30 14:56:503 days 1 hr ago0x05ca1e70c9277db555e124929e9f998edbaa651d IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00146126
0x36e828278457a7577c8a2ffe41a4afa9d5058eeed28f9293c7e642651e89405bDeposit All276219022022-09-30 14:52:203 days 2 hrs ago0x940e9777ff5beaf2ca41c55511e4f326aca5a4eb IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009128
0xa65c59395e37af1ec6bfe7dd8899d5f7218d9f9118fe52ce47bfca92a3b3b6ccDeposit All276216482022-09-30 14:50:563 days 2 hrs ago0x8aa578ab413e51c99cad01f77027353922cc08d2 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009299
0x937249094acad066fed547904f6e9e1b47e132f1b0cc172163a2d33723300e78Deposit All276201412022-09-30 14:45:593 days 2 hrs ago0xa344a809a722fe013e24ed9acfd4125ace2ea39f IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.000091
0xef15a8a5715fb8ad3335381ab30c38bb3554f1ba5a9c64735e38c4551df158baDeposit All276145042022-09-30 14:12:413 days 2 hrs ago0x5f0f8d8f8a44f95b01ff785a9db079e27822e167 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009268
0x28961750aa35f8fadb727f9e96e49f04b5e3a98d36f32625a195ef5c51ad7e8aDeposit All276143212022-09-30 14:11:313 days 2 hrs ago0x4ebdf882c349bfe175106138249dd9cba284ee36 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00145537
0x8e64dda2821f38efa010fed41af66e0855b19b437df65abc6e7d274ec4fa3880Deposit All276141212022-09-30 14:10:163 days 2 hrs ago0xcb753846776e93cf4ea6c3091284a4bfc47f8b43 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009069
0xd301a676778d35bbdd3bbfa0ee23cffd8f100cd711a7ac9cca627acc408b4778Deposit All276139302022-09-30 14:09:003 days 2 hrs ago0x8fc60a8d079601fe2c61ac7cb6bc38e7d8377b49 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00149041
0x34e7b3674b2a9a5ce5d0336be5c92ad81d4338bbfb2ff229dfdd82d7d4be570bDeposit All276133772022-09-30 14:05:463 days 2 hrs ago0x68481eb41e05b87c9e1f8a35eb3a40497b8359ac IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009059
0xb366f5e1a504cb526fd654946e0d8ca99a32fa70f46c71141e9e16ceeffc6d70Deposit All276128872022-09-30 14:03:223 days 2 hrs ago0x0b08452cc8f46225dbe0543ff7572c40315cc6ff IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009278
0xbe7892a12bb2bc6c10da816e9a752657329db2b64c7141ccd44fa31a3f3a2cd4Deposit All276126542022-09-30 14:02:063 days 2 hrs ago0xe02f572c06adbb22cfd6b7260b9ad7a18b2bb6fb IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00145779
0xb432ae6af2160ae0d1a9a81cf6d75a0aa28e4cf419c9341efa41f939889978d1Deposit All276121162022-09-30 13:59:283 days 2 hrs ago0x1992988de4684f4fea84752e8c0a78a67a97f36e IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009084
0x0795f4503f961248f356424eac82f01c7a0c4eb9dece6c8244a3d3d32103c8cbDeposit All276114922022-09-30 13:56:173 days 2 hrs ago0x644cdac61280c83fa73ac1f4f3bef93b1d30eaff IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00009084
0x557709539c1360a8b8bbc13626eab69f973e3433f8bd94e56660508ab6e2e85eDeposit All275977782022-09-30 12:35:453 days 4 hrs ago0x38f00ae4545fb442cebd82099d7d1311e0dc7587 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00008568
0xcf7019a5708a41f8dcbbf787331e6844b25377ce89f537c9ba0b8cafa13b6e23Deposit All275973472022-09-30 12:33:423 days 4 hrs ago0x4bd516ca845a1c5c756e3f194358f11ed147869b IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00133955
0x5b1b1c17c48e405a5caa95c0ffa8c540565ede8e105115c79b339d6235c217efDeposit All275968992022-09-30 12:32:043 days 4 hrs ago0xe6c4d85a56ff1f34b0d109dcc498b81b33287336 IN  0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH0.00137131
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Latest 25 internal transaction
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0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x15bbbd681d5374d500c0847984903f55a370bc25ed5b1b1cb944fb4221840a42281915652022-10-03 15:48:231 hr 7 mins ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x6d973e33af0801af13b7939956745c72bb17aa1e 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa60xb7e50106a5bd3cf21af210a755f9c8740890a8c90 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
0x6eacfd1f714af6fc9cc16559a899e7c9031102e06394d81d7dd497c05fa7f577279973052022-10-02 13:12:261 day 3 hrs ago 0x8cbaac87fdd9bb6c3fdb5b3c870b2443d0284fa6 0x8f2894459026cae358c4613ed6779e515f1f514e0 ETH
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xfcdd5a02c611ba6fe2802f885281500ec95805d7

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 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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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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