Overview
Max Total Supply
100,000,000 MASK
Holders
13,960 ( -0.014%)
Market
Price
$3.23 @ 0.000927 ETH (+2.83%)
Onchain Market Cap
$323,000,000.00
Circulating Supply Market Cap
$323,996,825.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
49.626405478696597019 MASKValue
$160.29 ( ~0.0459898567441504 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | BTCC | MASK-USDT | $3.24 0.0009289 Eth | $33,221,752.00 10,361,793.500 MASK | 31.1784% |
2 | Bitrue | MASK-USDT | $3.23 0.0009277 Eth | $26,516,853.00 8,197,694.700 MASK | 24.6666% |
3 | Binance | MASK-USDT | $3.24 0.0009283 Eth | $9,096,877.00 2,841,711.900 MASK | 8.5506% |
4 | LBank | MASK-USDT | $3.24 0.0009282 Eth | $4,938,860.00 1,525,996.940 MASK | 4.5917% |
5 | Bibox | MASK-USDT | $3.25 0.0009337 Eth | $4,846,306.00 1,489,189.000 MASK | 4.4809% |
6 | Websea | MASK-USDT | $3.23 0.0009273 Eth | $4,131,085.00 0.000 MASK | 0.0000% |
7 | Upbit | MASK-KRW | $3.32 0.0009520 Eth | $4,040,904.00 1,217,766.909 MASK | 3.6642% |
8 | OKX | MASK-USDT | $3.24 0.0009282 Eth | $2,915,267.00 907,232.037 MASK | 2.7298% |
9 | Gate.io | MASK-USDT | $3.23 0.0009267 Eth | $2,412,814.00 752,600.400 MASK | 2.2646% |
10 | HTX | MASK-USDT | $3.24 0.0009292 Eth | $1,909,136.00 595,127.828 MASK | 1.7907% |
11 | BYDFi | MASK-USDT | $3.23 0.0009246 Eth | $1,880,531.00 582,270.900 MASK | 1.7520% |
12 | Bitget | MASK-USDT | $3.24 0.0009289 Eth | $1,593,858.00 497,097.918 MASK | 1.4958% |
13 | Bybit | MASK-USDT | $3.24 0.0009290 Eth | $1,533,061.00 478,209.170 MASK | 1.4389% |
14 | MEXC | MASK-USDT | $3.23 0.0009271 Eth | $1,164,790.00 360,347.810 MASK | 1.0843% |
15 | Hotcoin | MASK-USDT | $3.23 0.0009268 Eth | $996,765.00 308,461.700 MASK | 0.9282% |
16 | Coinbase Exchange | MASK-USD | $3.24 0.0009294 Eth | $957,596.00 295,554.290 MASK | 0.8893% |
17 | WhiteBIT | MASK-USDT | $3.24 0.0009291 Eth | $948,932.00 292,924.322 MASK | 0.8814% |
18 | Biconomy.com | MASK-USDT | $3.23 0.0009266 Eth | $930,593.00 290,323.685 MASK | 0.8736% |
19 | Toobit | MASK-USDT | $3.23 0.0009276 Eth | $927,573.00 289,668.730 MASK | 0.8716% |
20 | Deepcoin | MASK-USDT | $3.23 0.0009272 Eth | $870,335.00 273,694.800 MASK | 0.8235% |
21 | Trubit | MASK-USDT | $3.24 0.0009270 Eth | $851,508.00 264,457.900 MASK | 0.7957% |
22 | Bitunix | MASK-USDT | $3.23 0.0009277 Eth | $842,207.00 260,293.380 MASK | 0.7832% |
23 | Ourbit | MASK-USDT | $3.23 0.0009277 Eth | $674,080.00 210,511.950 MASK | 0.6334% |
24 | Bithumb | MASK-KRW | $3.31 0.0009498 Eth | $663,599.00 200,438.058 MASK | 0.6031% |
25 | CoinW | MASK-USDT | $3.25 0.0009293 Eth | $596,658.00 183,826.515 MASK | 0.5531% |
26 | OrangeX | MASK-USDT | $3.24 0.0009287 Eth | $474,524.00 148,323.690 MASK | 0.4463% |
27 | Binance | MASK-TRY | $3.24 0.0009299 Eth | $437,510.00 136,129.900 MASK | 0.4096% |
28 | KuCoin | MASK-USDT | $3.23 0.0009273 Eth | $429,425.00 132,837.990 MASK | 0.3997% |
29 | Hibt | MASK-USDT | $3.23 0.0009277 Eth | $349,319.00 108,728.515 MASK | 0.3272% |
30 | Phemex | MASK-USDT | $3.22 0.0009240 Eth | $293,186.00 91,005.623 MASK | 0.2738% |
31 | Dex-Trade | MASK-USDT | $3.24 0.0009283 Eth | $282,959.00 87,418.344 MASK | 0.2630% |
32 | BTSE | MASK-USDT | $3.24 0.0009279 Eth | $275,155.00 85,047.994 MASK | 0.2559% |
33 | DigiFinex | MASK-USDT | $3.24 0.0009289 Eth | $259,042.00 80,013.547 MASK | 0.2408% |
34 | Icrypex | MASK-USDT | $3.22 0.0009233 Eth | $244,263.00 75,891.509 MASK | 0.2284% |
35 | BitDelta | MASK-USDT | $3.24 0.0009289 Eth | $236,182.00 73,693.100 MASK | 0.2217% |
36 | BIT | MASK-USDT | $3.24 0.0009285 Eth | $234,589.00 72,462.762 MASK | 0.2180% |
37 | BtcTurk | Kripto | MASK-TRY | $3.25 0.0009307 Eth | $232,963.00 71,786.930 MASK | 0.2160% |
38 | FameEX | MASK-USDT | $3.24 0.0009273 Eth | $190,855.00 59,634.110 MASK | 0.1794% |
39 | BVOX | MASK-USDT | $3.24 0.0009290 Eth | $187,462.00 58,389.500 MASK | 0.1757% |
40 | CoinTR | MASK-TRY | $3.25 0.0009312 Eth | $164,488.00 51,316.700 MASK | 0.1544% |
41 | CoinTR | MASK-USDT | $3.24 0.0009280 Eth | $149,167.00 46,486.000 MASK | 0.1399% |
42 | BingX | MASK-USDT | $3.24 0.0009293 Eth | $147,216.00 45,921.115 MASK | 0.1382% |
43 | Byte Exchange | MASK-USDT | $3.23 0.0009261 Eth | $146,694.00 45,450.054 MASK | 0.1368% |
44 | PointPay | MASK-USDT | $3.23 0.0009272 Eth | $144,630.00 45,161.941 MASK | 0.1359% |
45 | AscendEX (BitMax) | MASK-USDT | $3.22 0.0009227 Eth | $141,914.00 44,119.100 MASK | 0.1328% |
46 | Tapbit | MASK-USDT | $3.23 0.0009268 Eth | $141,517.00 44,168.200 MASK | 0.1329% |
47 | BitMart | MASK-USDT | $3.24 0.0009288 Eth | $126,175.00 38,971.860 MASK | 0.1173% |
48 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.24 0.0009281 Eth | $103,842.00 32,434.037 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0976% |
49 | ProBit Global | MASK-USDT | $3.23 0.0009265 Eth | $95,886.00 29,682.290 MASK | 0.0893% |
50 | Koinpark | MASK-USDT | $3.24 0.0009263 Eth | $84,512.00 26,119.136 MASK | 0.0786% |
51 | Binance | MASK-BNB | $3.23 0.0009272 Eth | $72,775.00 22,428.200 MASK | 0.0675% |
52 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.24 0.0009284 Eth | $71,486.00 22,080.213 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0664% |
53 | BloFin | MASK-USDT | $3.23 0.0009240 Eth | $67,829.00 21,180.000 MASK | 0.0637% |
54 | Bitbank | MASK-JPY | $3.25 0.0009322 Eth | $63,893.00 19,652.953 MASK | 0.0591% |
55 | Paribu | MASK-TRY | $3.22 0.0009236 Eth | $54,689.00 16,982.540 MASK | 0.0511% |
56 | Bitvavo | MASK-EUR | $3.23 0.0009263 Eth | $51,422.00 15,922.062 MASK | 0.0479% |
57 | BtcTurk | Kripto | MASK-USDT | $3.23 0.0009265 Eth | $45,756.00 14,164.010 MASK | 0.0426% |
58 | Coinbase Exchange | MASK-USDT | $3.22 0.0009230 Eth | $39,869.00 12,390.880 MASK | 0.0373% |
59 | Coinbase Exchange | MASK-EUR | $3.23 0.0009254 Eth | $34,810.00 10,790.240 MASK | 0.0325% |
60 | CoinEx | MASK-USDT | $3.22 0.0009249 Eth | $32,762.00 10,322.946 MASK | 0.0311% |
61 | Kraken | MASK-USD | $3.22 0.0009243 Eth | $30,417.00 9,440.307 MASK | 0.0284% |
62 | Pionex | MASK-USDT | $3.24 0.0009293 Eth | $27,957.00 8,725.679 MASK | 0.0263% |
63 | LATOKEN | MASK-USDT | $3.24 0.0009288 Eth | $26,288.00 8,105.165 MASK | 0.0244% |
64 | Tothemoon | MASK-USDT | $3.23 0.0009267 Eth | $25,767.00 7,976.500 MASK | 0.0240% |
65 | bitcastle | MASK-USDT | $3.24 0.0009289 Eth | $23,599.00 7,381.200 MASK | 0.0222% |
66 | Crypto.com Exchange | MASK-USDT | $3.23 0.0009253 Eth | $19,128.53 5,930.400 MASK | 0.0178% |
67 | Bitci TR | MASK-TRY | $3.22 0.0009244 Eth | $19,119.30 5,953.870 MASK | 0.0179% |
68 | Vindax | MASK-USDT | $3.23 0.0009262 Eth | $17,079.22 5,288.700 MASK | 0.0159% |
69 | Kanga | MASK-USDT | $3.23 0.0009278 Eth | $13,563.59 0.000 MASK | 0.0000% |
70 | Upbit | MASK-BTC | $3.20 0.0009177 Eth | $10,688.10 3,341.676 MASK | 0.0101% |
71 | OKX | MASK-USDC | $3.24 0.0009290 Eth | $8,705.84 2,720.772 MASK | 0.0082% |
72 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $3.27 0.0009372 Eth | $5,840.51 1,796.213 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0054% |
73 | Kraken | MASK-EUR | $3.25 0.0009314 Eth | $5,571.47 1,716.163 MASK | 0.0052% |
74 | Bit2Me | MASK-EUR | $3.25 0.0009310 Eth | $5,531.22 1,704.310 MASK | 0.0051% |
75 | Mudrex | MASK-USDT | $3.24 0.0009286 Eth | $5,421.62 1,674.457 MASK | 0.0050% |
76 | Bitlo | MASK-TRY | $3.25 0.0009317 Eth | $4,450.22 1,386.712 MASK | 0.0042% |
77 | Nami.Exchange | MASK-VNST | $3.23 0.0009267 Eth | $4,374.16 1,353.811 MASK | 0.0041% |
78 | Nami.Exchange | MASK-USDT | $3.23 0.0009275 Eth | $4,285.08 1,325.073 MASK | 0.0040% |
79 | Crypto.com Exchange | MASK-USD | $3.23 0.0009256 Eth | $4,105.98 1,272.500 MASK | 0.0038% |
80 | Max Maicoin | MASK-USDT | $3.21 0.0009214 Eth | $3,684.02 1,146.800 MASK | 0.0035% |
81 | Coinbase Exchange | MASK-GBP | $3.23 0.0009268 Eth | $3,066.60 949.200 MASK | 0.0029% |
82 | WEEX | MASK-USDT | $3.25 0.0009291 Eth | $2,714.50 841.500 MASK | 0.0025% |
83 | Dex-Trade | MASK-BNB | $3.24 0.0009281 Eth | $2,419.65 746.800 MASK | 0.0022% |
84 | Gemini | MASK-USD | $3.22 0.0009224 Eth | $2,086.69 649.048 MASK | 0.0020% |
85 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $3.22 0.0009233 Eth | $1,899.39 595.218 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0018% |
86 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $3.21 0.0009220 Eth | $1,491.85 486.212 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0015% |
87 | Binance US | MASK-USDT | $3.24 0.0009294 Eth | $509.00 156.875 MASK | 0.0005% |
88 | Bittime | MASK-IDR | $3.26 0.0009337 Eth | $302.52 93.420 MASK | 0.0003% |
89 | Mercado Bitcoin | MASK-BRL | $3.14 0.0009021 Eth | $279.10 88.745 MASK | 0.0003% |
90 | TokoCrypto | MASK-USDT | $3.24 0.0009289 Eth | $252.96 78.107 MASK | 0.0002% |
91 | Indodax | MASK-IDR | $3.24 0.0009296 Eth | $88.88 27.423 MASK | 0.0001% |
92 | Matcha (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0XC2132D05D31C914A87C6611C10748AEB04B58E8F | $3.21 0.0009216 Eth | $71.61 22.288 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0001% |
93 | Bancor (V2) | MASK-BNT | $3.37 0.0009666 Eth | $55.51 16.472 MASK | 0.0000% |
94 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $3.21 0.0009200 Eth | $41.25 13.046 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
95 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $3.23 0.0009271 Eth | $37.75 12.035 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0000% |
96 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $3.21 0.0009209 Eth | $31.25 9.747 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0000% |
97 | CEX.IO | MASK-USDT | $3.24 0.0009293 Eth | $25.89 8.001 MASK | 0.0000% |
98 | CEX.IO | MASK-USD | $3.24 0.0009285 Eth | $24.12 7.468 MASK | 0.0000% |
99 | OKCoin Japan | MASK-JPY | $3.24 0.0009282 Eth | $20.84 6.501 MASK | 0.0000% |
100 | Nominex | MASK-USDT | $3.24 0.0009288 Eth | $14.35 4.428 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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