Contract 0x4dbf253521e8e8080282c964975f3afb7f87cece 1

Contract Overview

Balance:
0 BNB
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x9cd570a03dd6622daf556eee99b52050a60492ae7c7777d0d92c18345683329dTransfer117867182021-08-25 12:30:4224 days 2 hrs ago0x16e633c45882da993f0c4d34b6c37863d91f63f1 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00023524
0x75a9d638b15956616bf3beb7d7a4b85f49f4a7ec02b6fa8826e6cbc114ae3a31Transfer113187782021-08-09 3:26:2540 days 11 hrs ago0x8ed3248240453531110537bf6c46ab94f92e3af9 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00051225
0x103ec60da4d2337a7e46f13602e7d9ff788b1d90852de82e9cd6c291954ccfa2Setup Decimals106046082021-07-15 5:37:4165 days 9 hrs ago0x77573983001ad1c3739dace188ae91079442d98c IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.0002738
0xf33cb6c20d641819c6fe3eb2593984b89a31eef9fcf8c3d5a65f6ca2c758696cTransfer102639112021-07-03 6:52:1877 days 8 hrs ago0x0eee896fc7ec8ff055fac8cfb196339a709eda0d IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00036189
0x91f5b7ece919ec07374f248f1dd20b081e2dbf35764fc6b41683ea2936a80082Transfer99887502021-06-23 15:53:1086 days 23 hrs ago0x20000b9b01e93a39db9d286e9264eff7f2af16e9 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00036201
0x77343a9dd8dfbe3568a597e3242dd254464682e0a91ad2cb079ef278ce3ae4bbTransfer94968562021-06-06 13:57:09104 days 1 hr ago0x9e8f9c54349e7797c18edcd04a50fda2e535b003 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00027825
0x7fd4bf270172438795182c5a5b6cce24a50755fa379e4842ef571c2d9cfb025bTransfer94838132021-06-06 3:04:49104 days 12 hrs ago0x0100b92e63f3caa9fd609efca310b264040ba82d IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00036189
0x9b5bc3a23b1e0c73afe26db8f8d67ce91a32e46f051838aee861ed43c8699e00Transfer89181992021-05-17 10:21:44124 days 4 hrs ago0x20000b9b01e93a39db9d286e9264eff7f2af16e9 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00051189
0xf593c3e3900a93afb8bd41091ddc4180d1ed09d2179b7116385c9f5b93d8630aTransfer88311292021-05-14 9:48:08127 days 5 hrs ago0x20000b9b01e93a39db9d286e9264eff7f2af16e9 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00051201
0xa666d3e0dfd8f1f121a3853ade1b736dfdb0fc63f5ff910c7db65b8597e7564eTransfer87606552021-05-11 22:37:36129 days 16 hrs ago0x883f2fe43877889151dce578c4ac5c3f962f8be3 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00036225
0xc76172cd068dbec06fa411f2ec5a7bf4fb82ba81b5a19717291a229d22246e8fTransfer84339052021-04-30 14:11:49141 days 53 mins ago0x18278510a3d377253ea770e2ff14372e5a29e4a7 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00051189
0x786402e2e0c6b8791f4d18eab2bb507167fcfb710e566d044eec841865010737Approve84059642021-04-29 14:54:43142 days 10 mins ago0x54e6627177165aa7b6f31752c744c306fac993db IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x0b87250e2df8d4592dd79bca33a277219d15ff856bfd3f473344775807f1d19dApprove84059062021-04-29 14:51:49142 days 13 mins ago0x54e6627177165aa7b6f31752c744c306fac993db IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0xfd427d3ee097fc1c90662f8316ecd0ba42c773edaf4ddfc2cc5fb22d630cf576Transfer83933912021-04-29 4:26:04142 days 10 hrs ago0xf29eb73afc67af2f0837f65f78c0f95f97e3a207 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00027825
0xd9eb0c68b68954e40cfbc5bfb37ace7ac5b5a0c3cff5666596a3635d58b1fcb6Approve83717342021-04-28 10:23:13143 days 4 hrs ago0x1ce2ac601747e7d7cad70e0febea2c8a06dba5bc IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x3d0cbe76af27ba0841eb20a897baecdefbbdfebe3327667a3a41deb8ce5d4d9dApprove83702032021-04-28 9:06:40143 days 5 hrs ago0xe8b76080031e3756d58736c594e45fc99e4dd700 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0xc4acb6b4058a4004de38854a319a17a00711fdadfffd544fe4003d6cfb23b2afApprove83696922021-04-28 8:41:07143 days 6 hrs ago0x7b9044d2862e1bcf5212f9d41583c291cd5419f6 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x37b83ec3a03d1b2973960c8067d301bcee2a0a18b20ed9f70597ffac8170755dApprove83685372021-04-28 7:43:22143 days 7 hrs ago0x12fe20de6b441f18ba9a3c9a7a78c9bd16723e8d IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0xce52fe6e96c1b0b095b1229472066f0e39b4ad05e4c3183652849d59e198d324Approve83664482021-04-28 5:58:55143 days 9 hrs ago0xcfc36d000ef5f72d212bbeb6c847a9a78d9b169b IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0xd20792aa29dcb2815a8ba82a30aac3ceef2b9a2d950339b89c884a4f18ce6b67Approve83656662021-04-28 5:19:49143 days 9 hrs ago0x03d874ee83838ad7340746441f71cb212cb11f98 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x4390386914947715389160f7a58726f6c49a9b332f6637503aadd7507294aac6Approve83656222021-04-28 5:17:37143 days 9 hrs ago0x03d874ee83838ad7340746441f71cb212cb11f98 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x704ac4e5cd322fb36a0875664f19cd187b446b41a96046ad9555e4f09a6d461fTransfer83638142021-04-28 3:47:13143 days 11 hrs ago0xfd8e315b65b5edc87ea60ebecdd8d1d6f8ba9b16 IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00027825
0x155bd48816ff31b17fde45c7fea8b101c42ee2ab7ba8d86d9335bae148ae541aApprove83636312021-04-28 3:38:04143 days 11 hrs ago0x0a1c964d4b66b376ea9a3a33e426e3a22be2e19a IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x3448f3cabbb112faf2f5428542e98b9391c8fcba3872a23492422e727188ff6dApprove83634502021-04-28 3:29:01143 days 11 hrs ago0xb5418a62847739c62f9ca17d9121a177657a73bf IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
0x55a26d61cc6f7556c810f15ce7245ffe2f00b337bc708d0651a61fa27ac2d890Approve83632712021-04-28 3:20:04143 days 11 hrs ago0x9ba6baa919bac9acd901df3bfde848fe006d3cae IN  0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB0.00044011
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0x97bdef31c79470d180fcdc1db61012be251a6b84d794e6e7f4ed4e76cec0583384276942021-04-30 9:01:16141 days 6 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x97bdef31c79470d180fcdc1db61012be251a6b84d794e6e7f4ed4e76cec0583384276942021-04-30 9:01:16141 days 6 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xb738f1efe1dcab2aed7a2eed212f606977de37e3a06e772037f36199c92662a684276892021-04-30 9:01:01141 days 6 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xb738f1efe1dcab2aed7a2eed212f606977de37e3a06e772037f36199c92662a684276892021-04-30 9:01:01141 days 6 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x6596e78f941b621b6364100cf50f9502ed324bae61442ffdc9afaa5b6c98219284264902021-04-30 8:01:04141 days 7 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x6596e78f941b621b6364100cf50f9502ed324bae61442ffdc9afaa5b6c98219284264902021-04-30 8:01:04141 days 7 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x3035e22c9701bc5c4df24e9c3967bfe4d25945c3cf9bb141eb1a04c13cab0a8184264882021-04-30 8:00:58141 days 7 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x3035e22c9701bc5c4df24e9c3967bfe4d25945c3cf9bb141eb1a04c13cab0a8184264882021-04-30 8:00:58141 days 7 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x7a808683da23a1d54c4b144d8bc23734122c6f72bb56c5ab2a8ad0dbad089f1f84252922021-04-30 7:01:09141 days 8 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x7a808683da23a1d54c4b144d8bc23734122c6f72bb56c5ab2a8ad0dbad089f1f84252922021-04-30 7:01:09141 days 8 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x83272e32c1dd3303f2d705534b45df02ea846f2ce117d41230db120d00d4c74d84252892021-04-30 7:01:00141 days 8 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x83272e32c1dd3303f2d705534b45df02ea846f2ce117d41230db120d00d4c74d84252892021-04-30 7:01:00141 days 8 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x2e67d732606ee4238b827dcb97fa41b53c188d457fc635b90609b123060ac96584240922021-04-30 6:01:09141 days 9 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x2e67d732606ee4238b827dcb97fa41b53c188d457fc635b90609b123060ac96584240922021-04-30 6:01:09141 days 9 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xf9d5dbe72935bccf8083a0bcab998c1af38c7cb340c4ff1f12fdaf55ba83f45484240892021-04-30 6:01:00141 days 9 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xf9d5dbe72935bccf8083a0bcab998c1af38c7cb340c4ff1f12fdaf55ba83f45484240892021-04-30 6:01:00141 days 9 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xb93647c53224fe3ba312d85e6649c031267cbc819fdae084b701bb11fa912ce584228932021-04-30 5:01:12141 days 10 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xb93647c53224fe3ba312d85e6649c031267cbc819fdae084b701bb11fa912ce584228932021-04-30 5:01:12141 days 10 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xcd97fdc350d4fd11c338bf6e6dbcaeef446ef82d424cd2e2d03b0858049831a784228892021-04-30 5:01:00141 days 10 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xcd97fdc350d4fd11c338bf6e6dbcaeef446ef82d424cd2e2d03b0858049831a784228892021-04-30 5:01:00141 days 10 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xefbcc81a2ac6f71506a416081ba8ee5bd37dca6bc457beab5d69222c7b96b59584216922021-04-30 4:01:09141 days 11 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xefbcc81a2ac6f71506a416081ba8ee5bd37dca6bc457beab5d69222c7b96b59584216922021-04-30 4:01:09141 days 11 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x994cb89890cfbf6f43ec6634034992f7cb0c11535de73ff87485f61d4d2bc73584216892021-04-30 4:01:00141 days 11 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0x994cb89890cfbf6f43ec6634034992f7cb0c11535de73ff87485f61d4d2bc73584216892021-04-30 4:01:00141 days 11 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
0xa37507c5aeb935a6e632868fdcd5f112e5c6fe63286b23ed2cbe5c09d5e5712784204922021-04-30 3:01:09141 days 12 hrs ago 0x2bfdfc92fc1cd1dd503a6836450e711bc4a9b0d7 0x4dbf253521e8e8080282c964975f3afb7f87cece0 BNB
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Contract Source Code Verified (Similar Match)
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x6Fcbfaf1eD00a24bB755026B826F65C9c88a7AA7

Contract Name:
ERC20Token

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 BscScan.com on 2021-02-23
*/

// File: @openzeppelin/contracts/GSN/Context.sol

// SPDX-License-Identifier: MIT

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



/**
 * @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



/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

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

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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






/**
 * @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 returns (string memory) {
        return _name;
    }

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

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 {
        _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: contracts/test/ERC20.sol



// providing optional methods (name, symbol and decimals)
contract ERC20Token is ERC20 {
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _initialSupply
    ) public ERC20(_name, _symbol) {
        _mint(msg.sender, _initialSupply);
    }

    function setupDecimals(uint8 decimals_) external {
        _setupDecimals(decimals_);
    }
}

Contract ABI

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Swarm Source

ipfs://619a42aae5e03d65464e251a227ae42148b571a1e37c7cbec37df99f005104c1
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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