Contract 0x8F4Ed4Cf0300E22c739d2E5A22220497B123b66e

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901Deposit589673162023-02-08 2:27:365 hrs 22 mins ago0x5afdd71ec312eda36663f72032f269bd9c950cb4 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00006978
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7eDeposit589373492023-02-07 23:43:568 hrs 6 mins ago0x2f1f95edd2b207e8dc04148f0b827f33c69aabcb IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00007546
0x0f96adb6629486b25250ff08e5d5bf03469281680bfb0e815a5f04efbc512724Deposit588909322023-02-07 19:58:1211 hrs 52 mins ago0x46d91b492861b9e4636719c03861fa9631792179 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.0000919
0x7ec7e5987cdb85cf2c56023706b3feda661995d78ca2dc112e9e8d78322bd6dcDeposit588745692023-02-07 18:38:0013 hrs 12 mins ago0x4b75beb23ffe0b8414b70c8b64c8f6cda569b3bf IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008053
0xd493ed1b193e5813bc2e84b74e115da682e539a6f747aada272a5cce9c1ff900Deposit588745062023-02-07 18:37:4313 hrs 12 mins ago0x4b75beb23ffe0b8414b70c8b64c8f6cda569b3bf IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008025
0xf1c7dafc8ac6749fe586b98312f50055fb0eab6f5b1c5e767c0bfd02dcadf130Deposit588744762023-02-07 18:37:3513 hrs 12 mins ago0x4b75beb23ffe0b8414b70c8b64c8f6cda569b3bf IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008196
0x6bf0929d2c3665f9b728fd2d659eea198a8bac80bcc528eef1b5a24fdeb832e1Withdraw588225102023-02-07 14:43:4917 hrs 6 mins ago0x6285f201641ae13d7ae9a272987f756c0a17c68d IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00006894
0x7d009a90662177174bac5ce31b08fe8836dabfdd165b6382294e1f6e0045934bDeposit588205062023-02-07 14:35:0617 hrs 15 mins ago0x6285f201641ae13d7ae9a272987f756c0a17c68d IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00007713
0xd1cfbdac5db553f4db97ac969f6f3b7b6b88655cabcd23cd828a207cc794c8f2Deposit588061472023-02-07 13:31:5318 hrs 18 mins ago0xf572d207af78a35b0c773684c9c98e5c9b9b0ca9 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00006318
0x39acee2846b702a8df150d79f0f4563e41b7ddb64557f4f3f84e58c090118f32Deposit587960782023-02-07 12:47:3519 hrs 2 mins ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.0000515
0xb5ed0021818534e7912211f92474e1794081e55241c66f53c32bd4e9fc51543eDeposit587958922023-02-07 12:46:4619 hrs 3 mins ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.0000515
0xb40703c995c0c6b26a5886ce2fcfaf44db0fef561ec84ebf8f06245901d1ce13Deposit587958452023-02-07 12:46:3319 hrs 3 mins ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00005321
0xe0225cff53c5dca27d085858616ca8f08b62b34472699b87d58ce31f4629c38fDeposit587498262023-02-07 9:24:4122 hrs 25 mins ago0x2f1f95edd2b207e8dc04148f0b827f33c69aabcb IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004577
0x8274a5582989f97e542d04504374192fd180290f98d4dd77e4606881bc53d601Deposit587482572023-02-07 9:17:5922 hrs 32 mins ago0x4234b0af34824ff09acf961cab2c6c8c5d3cb6d7 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004725
0xc6340008152b20560b4a11bae48f7bb30bd57829de90d6ba65d8ee0a1c0759c5Deposit586701632023-02-07 2:53:041 day 4 hrs ago0x4db24e856f34485bd5ae33e3885cd2e78f6ad252 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00005305
0xa13f1d5dcff75636464aa8240664819dcc720ba1bc07d00b7960f9c89d54ad6aDeposit586022192023-02-06 20:16:561 day 11 hrs ago0xd46c7f59346ad920944bfe2490a6c820959bb43d IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00007877
0x64a430432cc237c8ea0c64b8c090b1e7de77b6218c36e40cdde7a476b40e6622Deposit585577722023-02-06 16:35:421 day 15 hrs ago0xc08538f6e91985b20d35acb4458d03af690bf5f4 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008414
0x7aad8a1aa13898cffc6f181d3eb6e86d54f8c16cc2a522613555f5776107d5c0Deposit585577532023-02-06 16:35:361 day 15 hrs ago0xc08538f6e91985b20d35acb4458d03af690bf5f4 IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008585
0x16af1b5477591204d5bad9fb9a3e6e1888acaae510bbdda2e3700810b0cb8d01Withdraw585576482023-02-06 16:35:081 day 15 hrs ago0x251b81d1fbea289e694029699c2ab6063d2b137e IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00008166
0xd185aed887c4d736c19ecb0c6830e5e85fd1a670f0df25fadf0a689fdb105c7aWithdraw585528892023-02-06 16:14:201 day 15 hrs ago0x251b81d1fbea289e694029699c2ab6063d2b137e IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00005998
0x3263d25cc50f55a554eb3130e4d5c61de6befefdba9af744e0faf78b702ce3c1Deposit585528052023-02-06 16:13:581 day 15 hrs ago0x251b81d1fbea289e694029699c2ab6063d2b137e IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00006073
0xf7f9b5067d1b168e79da5f2750f75d61da09e461b2e918dc71b1083fb8c80973Deposit584955072023-02-06 11:59:371 day 19 hrs ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004119
0xf2fd3ac3a4ae58d9d6d046bf9c3c5684cdc44eabc6424c1ea81a13839ddf1decDeposit584950522023-02-06 11:57:331 day 19 hrs ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004257
0xa0188d927e6d718b65ab5227149fef8d5bcc5d0a7cb7504b7922b8307a3de1cfDeposit584949412023-02-06 11:57:031 day 19 hrs ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004257
0xab77c8e12f796d997dd9efe22088f38da6483ba21940034407c66815d12c7984Deposit584945002023-02-06 11:54:591 day 19 hrs ago0xfa1f780a446e9cdb4c51b031686bcf8b02f8ed7c IN  0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH0.00004428
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Latest 25 internal transaction
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0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2d7655ee943e48c2237e835d2ba638ccd3d56f4b0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2d7655ee943e48c2237e835d2ba638ccd3d56f4b0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2d7655ee943e48c2237e835d2ba638ccd3d56f4b0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2d7655ee943e48c2237e835d2ba638ccd3d56f4b0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x95a334e00987e595676ee144b5e4b328cde2ead5 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2d7655ee943e48c2237e835d2ba638ccd3d56f4b0 ETH
0xdc598a7c12ae35290a87cde1c5867682f489dfe06c27a276d7d5d3945278e3cf589680702023-02-08 2:31:115 hrs 19 mins ago 0x95a334e00987e595676ee144b5e4b328cde2ead5 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e 0x4e6482b05d13085f1c4a7e2ef612ba43104f71b90 ETH
0x581a156c078fe5a3687e6f5542da5067059a2e18c582ffe8fe2214e3e8a38901589673162023-02-08 2:27:365 hrs 22 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x2f2a2543b76a4166549f7aab2e75bef0aefc5b0f0 ETH
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7e589373492023-02-07 23:43:568 hrs 6 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x602b5efc42cd8c2c2d97bda82fe188638c695de80 ETH
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7e589373492023-02-07 23:43:568 hrs 6 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x602b5efc42cd8c2c2d97bda82fe188638c695de80 ETH
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7e589373492023-02-07 23:43:568 hrs 6 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x602b5efc42cd8c2c2d97bda82fe188638c695de80 ETH
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7e589373492023-02-07 23:43:568 hrs 6 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x602b5efc42cd8c2c2d97bda82fe188638c695de80 ETH
0x0fe1be2fa14a9df68b46165d910289b6c4f4d3325c84f361791a7cfe8637df7e589373492023-02-07 23:43:568 hrs 6 mins ago 0x8f4ed4cf0300e22c739d2e5a22220497b123b66e0x602b5efc42cd8c2c2d97bda82fe188638c695de80 ETH
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x0B8965F36d3f94752Ab74ee9D717B9dc6b3F3c3B

Contract Name:
WaterfallMasterChefV2

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Arbiscan on 2023-01-05
*/

pragma solidity 0.6.12;


// 
/**
 * @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;
    }
}

// 
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the token decimals.
     */
    function decimals() external view returns (uint8);

    /**
     * @dev Returns the token symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the token name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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);
}

// 
/**
 * @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);
            }
        }
    }
}

// 
/**
 * @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");
        }
    }
}

// 
/*
 * @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;
    }
}

// 
/**
 * @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;
    }
}

// 
/**
 * @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;
    }
}

// 
/**
 * @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, Ownable {
    using SafeMath for uint256;
    using Address for address;

    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 bep token owner.
     */
    function getOwner() external override view returns (address) {
        return owner();
    }

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

    /**
     * @dev Returns the token decimals.
     */
    function decimals() public override view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev Returns the token symbol.
     */
    function symbol() public override view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {ERC20-totalSupply}.
     */
    function totalSupply() public override view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {ERC20-balanceOf}.
     */
    function balanceOf(address account) public override view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {ERC20-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 override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {ERC20-allowance}.
     */
    function allowance(address owner, address spender) public override view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {ERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {ERC20-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 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 {ERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public 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 {ERC20-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 returns (bool) {
        _approve(
            _msgSender(),
            spender,
            _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")
        );
        return true;
    }

    /**
     * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
     * the total supply.
     *
     * Requirements
     *
     * - `msg.sender` must be the token owner
     */
    function mint(uint256 amount) public onlyOwner returns (bool) {
        _mint(_msgSender(), amount);
        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");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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 {
        require(account != address(0), "ERC20: burn from the zero address");

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

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(
            account,
            _msgSender(),
            _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance")
        );
    }
}




// WaterfallToken with Governance.
contract WaterfallToken is ERC20('Waterfall DEX', 'WTFX') {
    /// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
    function mint(address _to, uint256 _amount) public onlyOwner {
        _mint(_to, _amount);
    }
}



// MasterChef is the master of Waterfall. He can make Waterfall and he is a fair guy.
//
// Note that it's ownable and the owner wields tremendous power. The ownership
// will be transferred to a governance smart contract once KR is sufficiently
// distributed and the community can show to govern itself.
//
// Have fun reading it. Hopefully it's bug-free. God bless.
contract WaterfallMasterChefV2 is Ownable, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // Info of each user.
    struct UserInfo {
        uint256 amount;         // How many LP tokens the user has provided.
        uint256 rewardDebt;     // Reward debt. See explanation below.
        uint256 rewardLockedUp;  // Reward locked up.
        uint256 nextHarvestUntil; // When can the user harvest again.
        //
        // We do some fancy math here. Basically, any point in time, the amount of KRs
        // entitled to a user but is pending to be distributed is:
        //
        //   pending reward = (user.amount * pool.accWaterfallPerShare) - user.rewardDebt
        //
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:
        //   1. The pool's `accWaterfallPerShare` (and `lastRewardTime`) gets updated.
        //   2. User receives the pending reward sent to his/her address.
        //   3. User's `amount` gets updated.
        //   4. User's `rewardDebt` gets updated.
    }

    // Info of each pool.
    struct PoolInfo {
        IERC20 lpToken;             // Address of LP token contract.
        uint256 allocPoint;         // How many allocation points assigned to this pool. KRs to distribute per second.
        uint256 lastRewardTime;     // Last time KRs distribution occurs.
        uint256 accWaterfallPerShare;  // Accumulated KRs per share, times 1e18. See below.
        uint16 depositFeeBP;        // Deposit fee in basis points
        uint256 harvestInterval;    // Harvest interval in seconds
    }

    // The KR TOKEN!
    WaterfallToken public immutable waterfall;
    // Dev address.
    address public devAddress;
    // KR tokens created per second.
    uint256 public waterfallPerSecond;
    // Deposit Fee address
    address public feeAddress;

    // MAX TOKEN SUPPLY
    uint256 public constant MAX_SUPPLY = 1000000 ether;

    // MAX POOL FEE
    uint256 public constant MAX_POOL_FEE = 200;

    // Max harvest interval: 5 days.
    uint256 public constant MAXIMUM_HARVEST_INTERVAL = 5 days;

    // Total locked up rewards
    uint256 public totalLockedUpRewards;

    // Info of each pool.
    PoolInfo[] public poolInfo;
    // Info of each user that stakes LP tokens.
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;
    // Total allocation points. Must be the sum of all allocation points in all pools.
    uint256 public totalAllocPoint = 0;
    // The timestamp when KR mining starts.
    uint256 public startTime;
    
    // Maximum waterfallPerSecond
    uint256 public constant MAX_EMISSION_RATE = 0.1 ether;
    // Initial waterfallPerSecond
    uint256 public constant INITIAL_EMISSION_RATE = 0.07 ether;

    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event EmergencyWithdraw(address indexed user, uint256 indexed pid, uint256 amount);
    event SetFeeAddress(address indexed user, address indexed newAddress);
    event SetDevAddress(address indexed user, address indexed newAddress);
    event UpdateEmissionRate(address indexed user, uint256 indexed waterfallPerSecond);
    event RewardLockedUp(address indexed user, uint256 indexed pid, uint256 amountLockedUp);
    event StartTimeChanged(uint256 oldStartTime, uint256 newStartTime);

    constructor(
        WaterfallToken _waterfall,
        address _devAddress,
        address _feeAddress,
        uint256 _startTime
    ) public {
        waterfall = _waterfall;
        devAddress = _devAddress;
        feeAddress = _feeAddress;
        waterfallPerSecond = INITIAL_EMISSION_RATE;
        startTime = _startTime;
    }

    function poolLength() external view returns (uint256) {
        return poolInfo.length;
    }

    mapping(IERC20 => bool) public poolExistence;
    modifier nonDuplicated(IERC20 _lpToken) {
        require(poolExistence[_lpToken] == false, "nonDuplicated: duplicated");
        _;
    }
    
    function blockTimestamp() external view returns (uint time) { // to assist with countdowns on site
        time = block.timestamp;
    }

    // Add a new lp to the pool. Can only be called by the owner.
    function addPool(uint256 _allocPoint, IERC20 _lpToken, uint16 _depositFeeBP, uint256 _harvestInterval, bool _withUpdate) public onlyOwner nonDuplicated(_lpToken) {
        require(_depositFeeBP <= MAX_POOL_FEE, "add: invalid deposit fee basis points");
        require(_harvestInterval <= MAXIMUM_HARVEST_INTERVAL, "add: invalid harvest interval");

        _lpToken.balanceOf(address(this));

        if (_withUpdate) {
            massUpdatePools();
        }
        uint256 lastRewardTime = block.timestamp > startTime ? block.timestamp : startTime;
        totalAllocPoint = totalAllocPoint.add(_allocPoint);
        poolExistence[_lpToken] = true;
        poolInfo.push(PoolInfo({
        lpToken : _lpToken,
        allocPoint : _allocPoint,
        lastRewardTime: lastRewardTime,
        accWaterfallPerShare : 0,
        depositFeeBP : _depositFeeBP,
        harvestInterval : _harvestInterval
        }));
    }


     // Update startTime by the owner (added this to ensure that dev can delay startTime due to the congestion network). Only used if required. 
    function setStartTime(uint256 _newStartTime) external onlyOwner {
        require(startTime > block.timestamp, 'setStartTime: farm already started');
        require(_newStartTime > block.timestamp, 'setStartTime: new start time must be future time');

        uint256 _previousStartTime = startTime;

        startTime = _newStartTime;

        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; pid++) {
            PoolInfo storage pool = poolInfo[pid];
            pool.lastRewardTime = startTime;
        }

        emit StartTimeChanged(_previousStartTime, _newStartTime);
    }

    // Update the given pool's KR allocation point and deposit fee. Can only be called by the owner.
    function set(uint256 _pid, uint256 _allocPoint, uint16 _depositFeeBP, uint256 _harvestInterval, bool _withUpdate) external onlyOwner {
        require(_depositFeeBP <= MAX_POOL_FEE, "set: invalid deposit fee basis points");
        require(_harvestInterval <= MAXIMUM_HARVEST_INTERVAL, "set: invalid harvest interval");

        if (_withUpdate) {
            massUpdatePools();
        }
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(_allocPoint);
        poolInfo[_pid].allocPoint = _allocPoint;
        poolInfo[_pid].depositFeeBP = _depositFeeBP;
        poolInfo[_pid].harvestInterval = _harvestInterval;
    }

    // Return reward multiplier over the given _from to _to timestamp.
    function getMultiplier(uint256 _from, uint256 _to) public pure returns (uint256) {
        return _to.sub(_from);
    }

    // View function to see pending KRs on frontend.
    function pendingWaterfall(uint256 _pid, address _user) external view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][_user];
        uint256 accWaterfallPerShare = pool.accWaterfallPerShare;
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (block.timestamp > pool.lastRewardTime && lpSupply != 0 && totalAllocPoint > 0) {
            uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
            uint256 waterfallReward = multiplier.mul(waterfallPerSecond).mul(pool.allocPoint).div(totalAllocPoint);
            accWaterfallPerShare = accWaterfallPerShare.add(waterfallReward.mul(1e18).div(lpSupply));
        }

        uint256 pending = user.amount.mul(accWaterfallPerShare).div(1e18).sub(user.rewardDebt);
        return pending.add(user.rewardLockedUp);
    }


    // View function to see if user can harvest Waterfalls's.
    function canHarvest(uint256 _pid, address _user) public view returns (bool) {
        UserInfo storage user = userInfo[_pid][_user];
        return block.timestamp >= user.nextHarvestUntil;
    }
    // View function to see if user harvest until time.
    function getHarvestUntil(uint256 _pid, address _user) external view returns (uint256) {
        UserInfo storage user = userInfo[_pid][_user];
        return user.nextHarvestUntil;
    }

    // Update reward variables for all pools. Be careful of gas spending!
    function massUpdatePools() public {
        uint256 length = poolInfo.length;
        for (uint256 pid = 0; pid < length; ++pid) {
            updatePool(pid);
        }
    }

    // Update reward variables of the given pool to be up-to-date.
    function updatePool(uint256 _pid) public {
        PoolInfo storage pool = poolInfo[_pid];
        if (block.timestamp <= pool.lastRewardTime) {
            return;
        }
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));
        if (lpSupply == 0 || pool.allocPoint == 0) {
            pool.lastRewardTime = block.timestamp;
            return;
        }
        uint256 multiplier = getMultiplier(pool.lastRewardTime, block.timestamp);
        uint256 waterfallReward = multiplier.mul(waterfallPerSecond).mul(pool.allocPoint).div(totalAllocPoint);

        if (waterfall.totalSupply() >= MAX_SUPPLY) {
            waterfallReward = 0;
        } else if (waterfall.totalSupply().add(waterfallReward.mul(11).div(10)) >= MAX_SUPPLY) {
            waterfallReward = (MAX_SUPPLY.sub(waterfall.totalSupply()).mul(10).div(11));
        }

        if (waterfallReward > 0) {
            waterfall.mint(devAddress, waterfallReward.div(10));
            waterfall.mint(address(this), waterfallReward);
            pool.accWaterfallPerShare = pool.accWaterfallPerShare.add(waterfallReward.mul(1e18).div(lpSupply)); 
        }

        pool.lastRewardTime = block.timestamp;
    }

    // Deposit LP tokens to MasterChef for KR allocation.
    function deposit(uint256 _pid, uint256 _amount) external nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        updatePool(_pid);
        payOrLockuppendingWaterfall(_pid);

        if (_amount > 0) {
            uint256 _balanceBefore = pool.lpToken.balanceOf(address(this));
            pool.lpToken.safeTransferFrom(msg.sender, address(this), _amount);
            // for token that have transfer tax
            _amount = pool.lpToken.balanceOf(address(this)).sub(_balanceBefore);
            if (pool.depositFeeBP > 0) {
                uint256 depositFee = _amount.mul(pool.depositFeeBP).div(10000);
                pool.lpToken.safeTransfer(feeAddress, depositFee);
                user.amount = user.amount.add(_amount).sub(depositFee);
            } else {
                user.amount = user.amount.add(_amount);
            }
        }
        user.rewardDebt = user.amount.mul(pool.accWaterfallPerShare).div(1e18);
        emit Deposit(msg.sender, _pid, _amount);
    }

    // Withdraw LP tokens from MasterChef.
    function withdraw(uint256 _pid, uint256 _amount) external nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        require(user.amount >= _amount, "withdraw: not good");
        updatePool(_pid);
        payOrLockuppendingWaterfall(_pid);

        if (_amount > 0) {
            user.amount = user.amount.sub(_amount);
            pool.lpToken.safeTransfer(msg.sender, _amount);
        }
        user.rewardDebt = user.amount.mul(pool.accWaterfallPerShare).div(1e18);
        emit Withdraw(msg.sender, _pid, _amount);
    }

    function getPoolHarvestInterval(uint256 _pid) internal view returns (uint256) {
        PoolInfo storage pool = poolInfo[_pid];

        return block.timestamp.add(pool.harvestInterval);
    }

    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;
    }

    // Pay or lockup pending waterfall.
    function payOrLockuppendingWaterfall(uint256 _pid) internal {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];

        if (user.nextHarvestUntil == 0) {
            user.nextHarvestUntil = getPoolHarvestInterval(_pid);
        }
        uint256 pending = user.amount.mul(pool.accWaterfallPerShare).div(1e18).sub(user.rewardDebt);
        if (canHarvest(_pid, msg.sender)) {
            if (pending > 0 || user.rewardLockedUp > 0) {
                uint256 totalRewards = pending.add(user.rewardLockedUp);
                uint256 rewardsToLockup = totalRewards.div(2);
                uint256 rewardsToDistribute = totalRewards.sub(rewardsToLockup);
                // reset lockup
                totalLockedUpRewards = totalLockedUpRewards.sub(user.rewardLockedUp).add(rewardsToLockup);
                user.rewardLockedUp = rewardsToLockup;
                user.nextHarvestUntil = getPoolHarvestInterval(_pid);
                // send rewards
                safeWaterfallTransfer(msg.sender, rewardsToDistribute);
            }
        } else if (pending > 0) {
            user.rewardLockedUp = user.rewardLockedUp.add(pending);
            totalLockedUpRewards = totalLockedUpRewards.add(pending);
            emit RewardLockedUp(msg.sender, _pid, pending);
        }
    }

    // Withdraw without caring about rewards. EMERGENCY ONLY.
    function emergencyWithdraw(uint256 _pid) external nonReentrant {
        PoolInfo storage pool = poolInfo[_pid];
        UserInfo storage user = userInfo[_pid][msg.sender];
        pool.lpToken.safeTransfer(msg.sender, user.amount);
        emit EmergencyWithdraw(msg.sender, _pid, user.amount);
        user.amount = 0;
        user.rewardDebt = 0;
        user.rewardLockedUp = 0;
        user.nextHarvestUntil = 0;
    }

    // Safe waterfall transfer function, just in case if rounding error causes pool to not have enough KRs.
    function safeWaterfallTransfer(address _to, uint256 _amount) internal {
        uint256 waterfallBal = waterfall.balanceOf(address(this));
        bool transferSuccess = false;
        if (_amount > waterfallBal) {
            transferSuccess = waterfall.transfer(_to, waterfallBal);
        } else {
            transferSuccess = waterfall.transfer(_to, _amount);
        }
        require(transferSuccess, "safeWaterfallTransfer: transfer failed");
    }

    // Update dev address by the previous dev.
    function setDevAddress(address _devAddress) external {
        require(_devAddress != address(0), "setDevAddress: setting devAddress to the zero address is forbidden");
        require(msg.sender == devAddress, "setDevAddress: caller is not devAddress");
        devAddress = _devAddress;
        emit SetDevAddress(msg.sender, _devAddress);
    }

    function setFeeAddress(address _feeAddress) external {
        require(_feeAddress != address(0), "setFeeAddress: setting feeAddress to the zero address is forbidden");
        require(msg.sender == feeAddress, "setFeeAddress: caller is not feeAddress");
        feeAddress = _feeAddress;
        emit SetFeeAddress(msg.sender, _feeAddress);
    }

    //Pancake has to add hidden dummy pools inorder to alter the emission, here we make it simple and transparent to all.
    function updateEmissionRate(uint256 _waterfallPerSecond) external onlyOwner {
        require (_waterfallPerSecond <= MAX_EMISSION_RATE, "updateEmissionRate: value higher than maximum");
        massUpdatePools();
        waterfallPerSecond = _waterfallPerSecond;
        emit UpdateEmissionRate(msg.sender, _waterfallPerSecond);
    }
    
}

Contract ABI

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WaterfallToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"waterfallPerSecond","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_pid","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Metadata Hash

55a6d88e66d5da3fc8cb614ba5d04b90ffef28ad2d38604456a01e56b0f708b0
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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