Overview
Max Total Supply
100,000,000 MASK
Holders
13,930 ( -0.065%)
Market
Price
$3.40 @ 0.001290 ETH (+7.41%)
Onchain Market Cap
$340,000,000.00
Circulating Supply Market Cap
$342,613,055.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Upbit | MASK-KRW | $3.42 0.0012955 Eth | $126,747,823.00 37,086,530.952 MASK | 31.0539% |
2 | Binance | MASK-USDT | $3.43 0.0013004 Eth | $62,062,241.00 18,783,082.600 MASK | 15.7278% |
3 | Bitrue | MASK-USDT | $3.39 0.0012870 Eth | $59,546,371.00 17,554,654.200 MASK | 14.6992% |
4 | Gate.io | MASK-USDT | $3.40 0.0012890 Eth | $32,844,986.00 9,951,377.130 MASK | 8.3327% |
5 | Bithumb | MASK-KRW | $3.46 0.0013121 Eth | $23,020,615.00 6,649,749.503 MASK | 5.5681% |
6 | OKX | MASK-USDT | $3.39 0.0012864 Eth | $20,565,152.00 6,222,458.757 MASK | 5.2103% |
7 | Nami.Exchange | MASK-VNST | $3.41 0.0012906 Eth | $14,067,152.00 4,130,945.600 MASK | 3.4590% |
8 | Bybit | MASK-USDT | $3.42 0.0012974 Eth | $12,343,726.00 3,736,663.390 MASK | 3.1288% |
9 | BYDFi | MASK-USDT | $3.36 0.0012739 Eth | $11,508,879.00 3,425,685.900 MASK | 2.8685% |
10 | Websea | MASK-USDT | $3.42 0.0012965 Eth | $8,999,708.00 0.000 MASK | 0.0000% |
11 | Bitunix | MASK-USDT | $3.43 0.0013010 Eth | $8,427,358.00 2,452,220.130 MASK | 2.0533% |
12 | Bitget | MASK-USDT | $3.39 0.0012865 Eth | $8,146,134.00 2,450,089.955 MASK | 2.0516% |
13 | BtcTurk | Kripto | MASK-TRY | $3.45 0.0013065 Eth | $7,566,433.00 2,195,997.020 MASK | 1.8388% |
14 | Toobit | MASK-USDT | $3.43 0.0013000 Eth | $6,095,181.00 1,844,311.330 MASK | 1.5443% |
15 | Binance | MASK-TRY | $3.40 0.0012899 Eth | $5,133,285.00 1,533,953.600 MASK | 1.2844% |
16 | Ourbit | MASK-USDT | $3.39 0.0012858 Eth | $5,023,348.00 1,531,546.760 MASK | 1.2824% |
17 | Hotcoin | MASK-USDT | $3.40 0.0012871 Eth | $5,004,751.00 1,473,708.500 MASK | 1.2340% |
18 | KuCoin | MASK-USDT | $3.40 0.0012871 Eth | $4,472,541.00 1,317,277.841 MASK | 1.1030% |
19 | Biconomy.com | MASK-USDT | $3.35 0.0012701 Eth | $3,662,478.00 1,112,334.583 MASK | 0.9314% |
20 | FameEX | MASK-USDT | $3.43 0.0012997 Eth | $3,413,215.00 1,037,366.100 MASK | 0.8686% |
21 | Paribu | MASK-TRY | $3.41 0.0012940 Eth | $3,385,889.00 992,202.690 MASK | 0.8308% |
22 | Deepcoin | MASK-USDT | $3.39 0.0012863 Eth | $3,344,063.00 1,114,592.400 MASK | 0.9333% |
23 | Coinbase Exchange | MASK-USD | $3.43 0.0013006 Eth | $2,985,163.00 870,310.000 MASK | 0.7287% |
24 | HTX | MASK-USDT | $3.40 0.0012894 Eth | $2,759,405.00 846,321.711 MASK | 0.7087% |
25 | BTSE | MASK-USDT | $3.43 0.0012997 Eth | $2,268,358.00 661,497.539 MASK | 0.5539% |
26 | OrangeX | MASK-USDT | $3.39 0.0012841 Eth | $2,126,694.00 642,484.800 MASK | 0.5380% |
27 | Bibox | MASK-USDT | $3.45 0.0013066 Eth | $1,798,680.00 521,972.000 MASK | 0.4371% |
28 | bitcastle | MASK-USDT | $3.43 0.0013000 Eth | $1,727,420.00 521,720.100 MASK | 0.4369% |
29 | Dex-Trade | MASK-USDT | $3.38 0.0012795 Eth | $1,640,583.00 486,002.500 MASK | 0.4069% |
30 | DigiFinex | MASK-USDT | $3.40 0.0012886 Eth | $1,509,616.00 444,040.530 MASK | 0.3718% |
31 | Bitvavo | MASK-EUR | $3.44 0.0013046 Eth | $1,374,634.00 399,560.560 MASK | 0.3346% |
32 | BtcTurk | Kripto | MASK-USDT | $3.37 0.0012784 Eth | $1,350,894.00 400,645.930 MASK | 0.3355% |
33 | Phemex | MASK-USDT | $3.40 0.0012884 Eth | $1,184,690.00 348,572.520 MASK | 0.2919% |
34 | Byte Exchange | MASK-USDT | $3.43 0.0013000 Eth | $986,248.00 287,531.800 MASK | 0.2408% |
35 | PointPay | MASK-USDT | $3.40 0.0012882 Eth | $978,833.00 295,738.645 MASK | 0.2476% |
36 | BingX | MASK-USDT | $3.41 0.0012936 Eth | $894,073.00 270,919.049 MASK | 0.2269% |
37 | Trubit | MASK-USDT | $3.44 0.0013039 Eth | $822,066.00 252,695.900 MASK | 0.2116% |
38 | CoinW | MASK-USDT | $3.39 0.0012861 Eth | $804,669.00 237,430.556 MASK | 0.1988% |
39 | CoinEx | MASK-USDT | $3.37 0.0012790 Eth | $775,767.00 232,552.289 MASK | 0.1947% |
40 | Koinpark | MASK-USDT | $3.43 0.0012992 Eth | $592,517.00 172,843.914 MASK | 0.1447% |
41 | Tapbit | MASK-USDT | $3.42 0.0012959 Eth | $524,398.00 158,442.000 MASK | 0.1327% |
42 | BitMart | MASK-USDT | $3.40 0.0012891 Eth | $520,575.00 153,122.060 MASK | 0.1282% |
43 | BIT | MASK-USDT | $3.40 0.0012886 Eth | $491,021.00 144,415.868 MASK | 0.1209% |
44 | Kraken | MASK-USD | $3.41 0.0012909 Eth | $434,219.00 127,486.507 MASK | 0.1067% |
45 | Nominex | MASK-USDT | $3.42 0.0012967 Eth | $423,186.00 123,697.267 MASK | 0.1036% |
46 | Pionex | MASK-USDT | $3.39 0.0012858 Eth | $420,326.00 128,101.046 MASK | 0.1073% |
47 | Binance | MASK-BNB | $3.38 0.0012831 Eth | $410,716.00 127,809.500 MASK | 0.1070% |
48 | LBank | MASK-USDT | $3.43 0.0013017 Eth | $392,672.00 114,360.720 MASK | 0.0958% |
49 | Coinbase Exchange | MASK-USDT | $3.43 0.0013004 Eth | $375,685.00 109,543.260 MASK | 0.0917% |
50 | OKX | MASK-USDC | $3.39 0.0012861 Eth | $372,619.00 110,946.074 MASK | 0.0929% |
51 | BitDelta | MASK-USDT | $3.42 0.0012977 Eth | $369,725.00 113,345.200 MASK | 0.0949% |
52 | Icrypex | MASK-USDT | $3.44 0.0013046 Eth | $368,289.00 106,997.005 MASK | 0.0896% |
53 | Coinbase Exchange | MASK-EUR | $3.44 0.0013037 Eth | $323,610.00 94,125.170 MASK | 0.0788% |
54 | Max Maicoin | MASK-USDT | $3.38 0.0012799 Eth | $313,398.00 92,847.200 MASK | 0.0777% |
55 | Bitbank | MASK-JPY | $3.46 0.0013111 Eth | $288,630.00 83,476.716 MASK | 0.0699% |
56 | MEXC | MASK-USDT | $3.45 0.0013070 Eth | $257,471.00 74,702.930 MASK | 0.0626% |
57 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.42 0.0012973 Eth | $242,950.00 73,166.230 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0613% |
58 | BloFin | MASK-USDT | $3.43 0.0013020 Eth | $206,095.00 62,772.700 MASK | 0.0526% |
59 | Vindax | MASK-USDT | $3.35 0.0012701 Eth | $155,830.00 46,497.100 MASK | 0.0389% |
60 | CoinTR | MASK-TRY | $3.40 0.0012871 Eth | $154,899.00 47,316.200 MASK | 0.0396% |
61 | AscendEX (BitMax) | MASK-USDT | $3.43 0.0012996 Eth | $147,120.00 42,904.000 MASK | 0.0359% |
62 | LATOKEN | MASK-USDT | $3.44 0.0013032 Eth | $144,638.00 42,087.723 MASK | 0.0352% |
63 | ProBit Global | MASK-USDT | $3.39 0.0012873 Eth | $140,717.00 41,457.120 MASK | 0.0347% |
64 | CoinTR | MASK-USDT | $3.41 0.0012920 Eth | $139,320.00 42,770.200 MASK | 0.0358% |
65 | Crypto.com Exchange | MASK-USDT | $3.44 0.0013023 Eth | $117,552.00 34,211.500 MASK | 0.0286% |
66 | TokoCrypto | MASK-USDT | $3.38 0.0012822 Eth | $92,436.00 27,343.864 MASK | 0.0229% |
67 | Crypto.com Exchange | MASK-USD | $3.43 0.0013003 Eth | $89,083.00 25,966.500 MASK | 0.0217% |
68 | Coinbase Exchange | MASK-GBP | $3.45 0.0013066 Eth | $47,711.00 13,846.510 MASK | 0.0116% |
69 | Nominex | MASK-TRY | $3.44 0.0013028 Eth | $44,316.00 12,895.526 MASK | 0.0108% |
70 | Bitlo | MASK-TRY | $3.40 0.0012898 Eth | $42,896.00 13,003.344 MASK | 0.0109% |
71 | OKCoin Japan | MASK-JPY | $3.44 0.0013028 Eth | $40,632.00 12,224.537 MASK | 0.0102% |
72 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $3.38 0.0012822 Eth | $32,327.00 9,694.466 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0081% |
73 | Coinone | MASK-KRW | $3.45 0.0013061 Eth | $31,940.00 9,268.960 MASK | 0.0078% |
74 | Gemini | MASK-USD | $3.41 0.0012921 Eth | $29,205.00 8,567.168 MASK | 0.0072% |
75 | Cryptology | MASK-USDT | $3.43 0.0013010 Eth | $26,959.00 7,854.000 MASK | 0.0066% |
76 | Kraken | MASK-EUR | $3.37 0.0012766 Eth | $25,597.00 7,599.589 MASK | 0.0064% |
77 | Bit2Me | MASK-EUR | $3.37 0.0012773 Eth | $25,233.00 7,695.977 MASK | 0.0064% |
78 | WEEX | MASK-USDT | $3.43 0.0012997 Eth | $23,338.00 7,159.000 MASK | 0.0060% |
79 | Mudrex | MASK-USDT | $3.40 0.0012871 Eth | $22,048.00 6,492.329 MASK | 0.0054% |
80 | Kanga | MASK-USDT | $3.43 0.0012994 Eth | $16,628.20 0.000 MASK | 0.0000% |
81 | Dex-Trade | MASK-BNB | $3.36 0.0012746 Eth | $14,337.36 4,263.400 MASK | 0.0036% |
82 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $3.36 0.0012734 Eth | $13,182.19 3,914.790 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0033% |
83 | Upbit Indonesia | MASK-BTC | $3.35 0.0012716 Eth | $12,791.32 3,816.560 MASK | 0.0032% |
84 | Upbit | MASK-BTC | $3.35 0.0012703 Eth | $12,135.98 3,621.581 MASK | 0.0030% |
85 | CoinDCX | MASK-INR | $3.60 0.0013652 Eth | $10,375.17 0.000 MASK | 0.0000% |
86 | PancakeSwap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.47 0.0013147 Eth | $8,647.84 2,622.456 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0022% |
87 | Bitci TR | MASK-TRY | $3.42 0.0012977 Eth | $7,464.81 2,246.524 MASK | 0.0019% |
88 | Binance US | MASK-USDT | $3.38 0.0012822 Eth | $5,478.01 1,619.253 MASK | 0.0014% |
89 | Nominex | MASK-BNB | $3.42 0.0012960 Eth | $3,026.63 885.138 MASK | 0.0007% |
90 | Sushiswap | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.44 0.0013045 Eth | $2,565.80 560.270 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0005% |
91 | Bittime | MASK-IDR | $3.41 0.0012911 Eth | $1,733.17 496.080 MASK | 0.0004% |
92 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $3.42 0.0012959 Eth | $1,054.26 294.420 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0002% |
93 | Gate.io | MASK-TRY | $3.51 0.0013316 Eth | $858.49 260.079 MASK | 0.0002% |
94 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $3.42 0.0012977 Eth | $725.74 212.256 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0002% |
95 | CEX.IO | MASK-USD | $3.41 0.0012928 Eth | $539.86 165.569 MASK | 0.0001% |
96 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7 | $3.38 0.0012820 Eth | $406.28 126.808 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0001% |
97 | Gate.io | MASK-ETH | $3.38 0.0012797 Eth | $247.00 74.909 MASK | 0.0001% |
98 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $3.42 0.0012961 Eth | $104.59 31.426 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0000% |
99 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $3.39 0.0012833 Eth | $81.33 25.034 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
100 | CEX.IO | MASK-USDT | $3.36 0.0012745 Eth | $37.99 11.715 MASK | 0.0000% |
Contract Name:
MaskToken
Compiler Version
v0.6.6+commit.6c089d02
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2021-02-19 */ // File: @openzeppelin/contracts/token/ERC20/IERC20.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // File: @openzeppelin/contracts/utils/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/math/SafeMath.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } } // File: @openzeppelin/contracts/token/ERC20/ERC20.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) public { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal virtual { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } } // File: contracts/mask.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; contract MaskToken is ERC20 { constructor() ERC20("Mask Network", "MASK") public { _mint(msg.sender, 100_000_000 * (10 ** uint256(decimals()))); } }
Contract Security Audit
- SECBIT Lab - February 22nd, 2021 - Security Audit Report
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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