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Overview
Max Total Supply
100,000,000 MASK
Holders
13,950 ( -0.036%)
Market
Price
$2.93 @ 0.001140 ETH (-12.44%)
Onchain Market Cap
$293,000,000.00
Circulating Supply Market Cap
$293,159,072.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Upbit | MASK-KRW | $2.96 0.0011519 Eth | $74,055,498.00 24,998,791.863 MASK | 17.5607% |
2 | BTCC | MASK-USDT | $2.91 0.0011335 Eth | $66,664,899.00 22,517,151.700 MASK | 15.8174% |
3 | Binance | MASK-USDT | $2.93 0.0011355 Eth | $52,586,998.00 17,664,888.800 MASK | 12.4089% |
4 | Bitrue | MASK-USDT | $2.92 0.0011364 Eth | $47,555,880.00 16,263,369.100 MASK | 11.4244% |
5 | Gate.io | MASK-USDT | $2.91 0.0011311 Eth | $26,062,879.00 8,812,107.400 MASK | 6.1902% |
6 | OKX | MASK-USDT | $2.92 0.0011360 Eth | $17,456,812.00 5,855,769.376 MASK | 4.1135% |
7 | WhiteBIT | MASK-USDT | $2.91 0.0011294 Eth | $16,020,284.00 5,506,257.352 MASK | 3.8679% |
8 | Bithumb | MASK-KRW | $2.95 0.0011463 Eth | $14,258,004.00 4,839,144.241 MASK | 3.3993% |
9 | Nami.Exchange | MASK-VNST | $2.92 0.0011364 Eth | $12,409,444.00 4,243,701.800 MASK | 2.9810% |
10 | Bybit | MASK-USDT | $2.92 0.0011355 Eth | $11,531,044.00 3,880,481.180 MASK | 2.7259% |
11 | BYDFi | MASK-USDT | $2.90 0.0011203 Eth | $9,441,576.00 3,261,292.000 MASK | 2.2909% |
12 | Websea | MASK-USDT | $2.92 0.0011304 Eth | $7,535,393.00 0.000 MASK | 0.0000% |
13 | Bitunix | MASK-USDT | $2.93 0.0011350 Eth | $6,644,526.00 2,268,961.980 MASK | 1.5939% |
14 | Bitget | MASK-USDT | $2.90 0.0011277 Eth | $5,174,608.00 1,726,765.043 MASK | 1.2130% |
15 | Toobit | MASK-USDT | $2.90 0.0011275 Eth | $5,169,058.00 1,734,038.830 MASK | 1.2181% |
16 | BtcTurk | Kripto | MASK-TRY | $2.94 0.0011422 Eth | $4,157,980.00 1,414,615.430 MASK | 0.9937% |
17 | Hotcoin | MASK-USDT | $2.93 0.0011410 Eth | $3,929,872.00 1,339,089.700 MASK | 0.9407% |
18 | Ourbit | MASK-USDT | $2.90 0.0011249 Eth | $3,322,127.00 1,114,573.580 MASK | 0.7829% |
19 | Biconomy.com | MASK-USDT | $2.89 0.0011201 Eth | $3,089,976.00 1,038,992.718 MASK | 0.7299% |
20 | Binance | MASK-TRY | $2.92 0.0011354 Eth | $3,067,529.00 1,032,989.100 MASK | 0.7256% |
21 | KuCoin | MASK-USDT | $2.91 0.0011326 Eth | $3,056,322.00 1,049,367.208 MASK | 0.7371% |
22 | Deepcoin | MASK-USDT | $2.90 0.0011243 Eth | $2,609,408.00 920,744.400 MASK | 0.6468% |
23 | HTX | MASK-USDT | $2.91 0.0011319 Eth | $2,366,932.00 804,277.814 MASK | 0.5650% |
24 | Paribu | MASK-TRY | $2.94 0.0011412 Eth | $2,325,463.00 791,015.880 MASK | 0.5557% |
25 | BTSE | MASK-USDT | $2.93 0.0011381 Eth | $2,272,511.00 775,831.363 MASK | 0.5450% |
26 | OrangeX | MASK-USDT | $2.93 0.0011366 Eth | $1,799,091.00 606,567.680 MASK | 0.4261% |
27 | Bibox | MASK-USDT | $2.94 0.0011442 Eth | $1,663,418.00 565,290.000 MASK | 0.3971% |
28 | bitcastle | MASK-USDT | $2.92 0.0011367 Eth | $1,523,025.00 514,593.800 MASK | 0.3615% |
29 | BtcTurk | Kripto | MASK-USDT | $2.93 0.0011397 Eth | $1,353,223.00 461,417.320 MASK | 0.3241% |
30 | Dex-Trade | MASK-USDT | $2.90 0.0011232 Eth | $1,215,694.00 419,833.700 MASK | 0.2949% |
31 | DigiFinex | MASK-USDT | $2.91 0.0011332 Eth | $1,211,899.00 415,851.433 MASK | 0.2921% |
32 | Trubit | MASK-USDT | $2.90 0.0011252 Eth | $1,173,001.00 390,879.300 MASK | 0.2746% |
33 | Coinbase Exchange | MASK-USD | $2.91 0.0011317 Eth | $1,142,299.00 392,542.460 MASK | 0.2757% |
34 | FameEX | MASK-USDT | $2.91 0.0011299 Eth | $1,072,908.00 359,998.900 MASK | 0.2529% |
35 | Phemex | MASK-USDT | $2.92 0.0011362 Eth | $1,056,266.00 361,219.468 MASK | 0.2537% |
36 | PointPay | MASK-USDT | $2.90 0.0011271 Eth | $832,551.00 281,050.357 MASK | 0.1974% |
37 | BingX | MASK-USDT | $2.90 0.0011293 Eth | $710,411.00 239,198.053 MASK | 0.1680% |
38 | Byte Exchange | MASK-USDT | $2.92 0.0011351 Eth | $708,008.00 242,390.300 MASK | 0.1703% |
39 | CoinW | MASK-USDT | $2.93 0.0011351 Eth | $669,072.00 228,448.597 MASK | 0.1605% |
40 | Bitvavo | MASK-EUR | $2.93 0.0011397 Eth | $644,627.00 219,932.073 MASK | 0.1545% |
41 | Binance | MASK-BNB | $2.94 0.0011417 Eth | $497,434.00 164,010.100 MASK | 0.1152% |
42 | BIT | MASK-USDT | $2.88 0.0011169 Eth | $490,931.00 170,571.101 MASK | 0.1198% |
43 | Koinpark | MASK-USDT | $2.91 0.0011291 Eth | $473,272.00 162,827.741 MASK | 0.1144% |
44 | BitMart | MASK-USDT | $2.93 0.0011389 Eth | $469,701.00 160,364.760 MASK | 0.1127% |
45 | Tapbit | MASK-USDT | $2.92 0.0011363 Eth | $453,044.00 152,901.000 MASK | 0.1074% |
46 | Bitbank | MASK-JPY | $2.94 0.0011436 Eth | $442,789.00 150,428.311 MASK | 0.1057% |
47 | LBank | MASK-USDT | $2.91 0.0011312 Eth | $419,231.00 144,126.840 MASK | 0.1012% |
48 | Icrypex | MASK-USDT | $2.94 0.0011437 Eth | $407,774.00 138,648.126 MASK | 0.0974% |
49 | CoinEx | MASK-USDT | $2.90 0.0011277 Eth | $385,086.00 127,873.933 MASK | 0.0898% |
50 | BitDelta | MASK-USDT | $2.93 0.0011373 Eth | $364,681.00 122,716.400 MASK | 0.0862% |
51 | Nominex | MASK-USDT | $2.91 0.0011320 Eth | $362,799.00 124,640.488 MASK | 0.0876% |
52 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.93 0.0011341 Eth | $330,627.00 111,006.175 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0780% |
53 | Coinbase Exchange | MASK-EUR | $2.91 0.0011318 Eth | $305,700.00 105,037.290 MASK | 0.0738% |
54 | Kraken | MASK-USD | $2.93 0.0011367 Eth | $298,468.00 102,040.472 MASK | 0.0717% |
55 | OKX | MASK-USDC | $2.93 0.0011398 Eth | $274,298.00 92,000.917 MASK | 0.0646% |
56 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.92 0.0011366 Eth | $229,822.00 77,217.913 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0542% |
57 | Pionex | MASK-USDT | $2.92 0.0011365 Eth | $221,806.00 74,473.869 MASK | 0.0523% |
58 | BloFin | MASK-USDT | $2.91 0.0011315 Eth | $201,091.00 67,903.200 MASK | 0.0477% |
59 | CoinTR | MASK-TRY | $2.93 0.0011382 Eth | $173,682.00 58,878.500 MASK | 0.0414% |
60 | MEXC | MASK-USDT | $2.90 0.0011272 Eth | $170,982.00 58,887.630 MASK | 0.0414% |
61 | Coinbase Exchange | MASK-USDT | $2.93 0.0011390 Eth | $155,042.00 52,957.540 MASK | 0.0372% |
62 | Vindax | MASK-USDT | $2.87 0.0011156 Eth | $140,021.00 48,718.300 MASK | 0.0342% |
63 | AscendEX (BitMax) | MASK-USDT | $2.92 0.0011347 Eth | $139,343.00 47,756.800 MASK | 0.0335% |
64 | ProBit Global | MASK-USDT | $2.93 0.0011378 Eth | $133,798.00 45,727.859 MASK | 0.0321% |
65 | CoinTR | MASK-USDT | $2.90 0.0011263 Eth | $128,491.00 43,539.400 MASK | 0.0306% |
66 | LATOKEN | MASK-USDT | $2.90 0.0011207 Eth | $126,546.00 43,701.769 MASK | 0.0307% |
67 | Bit2Me | MASK-EUR | $2.94 0.0011414 Eth | $44,548.00 14,285.715 MASK | 0.0100% |
68 | Kraken | MASK-EUR | $2.94 0.0011407 Eth | $42,790.00 14,577.260 MASK | 0.0102% |
69 | Crypto.com Exchange | MASK-USDT | $2.93 0.0011414 Eth | $42,686.00 14,549.800 MASK | 0.0102% |
70 | Bitlo | MASK-TRY | $2.95 0.0011452 Eth | $36,677.00 12,443.498 MASK | 0.0087% |
71 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.87 0.0011159 Eth | $33,233.00 10,796.488 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0076% |
72 | Coinbase Exchange | MASK-GBP | $2.91 0.0011309 Eth | $32,371.00 11,131.640 MASK | 0.0078% |
73 | TokoCrypto | MASK-USDT | $2.90 0.0011215 Eth | $27,130.00 9,368.029 MASK | 0.0066% |
74 | Crypto.com Exchange | MASK-USD | $2.92 0.0011352 Eth | $23,331.00 7,995.700 MASK | 0.0056% |
75 | Cryptology | MASK-USDT | $2.92 0.0011323 Eth | $22,623.00 7,745.400 MASK | 0.0054% |
76 | Gemini | MASK-USD | $2.90 0.0011290 Eth | $22,469.00 7,739.932 MASK | 0.0054% |
77 | WEEX | MASK-USDT | $2.89 0.0011225 Eth | $20,599.00 6,983.400 MASK | 0.0049% |
78 | Nominex | MASK-TRY | $2.93 0.0011375 Eth | $19,715.42 6,735.552 MASK | 0.0047% |
79 | Bitci TR | MASK-TRY | $2.93 0.0011376 Eth | $16,573.53 5,618.850 MASK | 0.0039% |
80 | Dex-Trade | MASK-BNB | $2.94 0.0011418 Eth | $16,414.25 5,586.000 MASK | 0.0039% |
81 | Coinone | MASK-KRW | $2.93 0.0011396 Eth | $14,172.38 4,836.301 MASK | 0.0034% |
82 | PancakeSwap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.88 0.0011195 Eth | $12,056.05 3,977.239 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0028% |
83 | OKCoin Japan | MASK-JPY | $2.93 0.0011374 Eth | $11,732.22 3,832.910 MASK | 0.0027% |
84 | Kanga | MASK-USDT | $2.93 0.0011393 Eth | $10,207.53 0.000 MASK | 0.0000% |
85 | Gate.io | MASK-TRY | $2.95 0.0011471 Eth | $4,528.97 1,519.262 MASK | 0.0011% |
86 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.88 0.0011178 Eth | $3,775.24 1,280.544 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0009% |
87 | CoinDCX | MASK-INR | $2.90 0.0011258 Eth | $3,253.09 0.000 MASK | 0.0000% |
88 | Binance US | MASK-USDT | $2.93 0.0011370 Eth | $2,298.28 785.532 MASK | 0.0006% |
89 | Nominex | MASK-BNB | $2.91 0.0011306 Eth | $1,958.26 673.855 MASK | 0.0005% |
90 | CEX.IO | MASK-USDT | $2.91 0.0011332 Eth | $1,816.27 611.116 MASK | 0.0004% |
91 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7 | $2.87 0.0011159 Eth | $672.17 215.450 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0002% |
92 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.87 0.0011156 Eth | $610.78 198.448 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
93 | Indodax | MASK-IDR | $3.00 0.0011654 Eth | $420.18 139.891 MASK | 0.0001% |
94 | Gate.io | MASK-ETH | $2.89 0.0011233 Eth | $403.13 126.103 MASK | 0.0001% |
95 | Sushiswap | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.91 0.0011289 Eth | $317.50 100.436 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0001% |
96 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.85 0.0011035 Eth | $236.23 78.509 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
97 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.87 0.0011140 Eth | $128.88 42.597 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0000% |
98 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.87 0.0011162 Eth | $110.86 36.657 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
99 | Bittime | MASK-IDR | $2.90 0.0011252 Eth | $65.55 21.780 MASK | 0.0000% |
100 | CEX.IO | MASK-USD | $2.93 0.0011388 Eth | $61.45 20.339 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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