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Overview
Max Total Supply
100,000,000 MASK
Holders
13,723 ( -0.029%)
Market
Price
$2.53 @ 0.000746 ETH (-2.47%)
Onchain Market Cap
$253,000,000.00
Circulating Supply Market Cap
$253,013,651.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
26,174.146570067338224736 MASKValue
$66,220.59 ( ~19.5220 Eth) [0.0262%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Bibox | MASK-USDT | $2.55 0.0007505 Eth | $4,000,871.00 1,571,604.000 MASK | 24.7897% |
2 | HTX | MASK-USDT | $2.53 0.0007460 Eth | $2,935,935.00 1,152,503.767 MASK | 18.1791% |
3 | Binance | MASK-USDT | $2.53 0.0007462 Eth | $1,529,565.00 601,738.200 MASK | 9.4915% |
4 | Bitget | MASK-USDT | $2.53 0.0007458 Eth | $1,473,702.00 578,771.520 MASK | 9.1293% |
5 | Bitrue | MASK-USDT | $2.53 0.0007458 Eth | $1,335,320.00 527,153.200 MASK | 8.3151% |
6 | BloFin | MASK-USDT | $2.53 0.0007458 Eth | $1,113,365.00 437,084.500 MASK | 6.8944% |
7 | OKX | MASK-USDT | $2.53 0.0007460 Eth | $1,061,673.00 416,493.975 MASK | 6.5696% |
8 | Trubit | MASK-USDT | $2.53 0.0007463 Eth | $918,498.00 359,431.200 MASK | 5.6695% |
9 | Toobit | MASK-USDT | $2.53 0.0007463 Eth | $897,519.00 351,565.280 MASK | 5.5454% |
10 | Bybit | MASK-USDT | $2.53 0.0007470 Eth | $850,743.00 332,707.010 MASK | 5.2480% |
11 | KuCoin | MASK-USDT | $2.53 0.0007470 Eth | $814,591.00 321,512.405 MASK | 5.0714% |
12 | Upbit | MASK-KRW | $2.58 0.0007609 Eth | $420,825.00 163,051.040 MASK | 2.5719% |
13 | Deepcoin | MASK-USDT | $2.53 0.0007458 Eth | $371,414.00 148,344.273 MASK | 2.3399% |
14 | WhiteBIT | MASK-USDT | $2.53 0.0007456 Eth | $332,259.00 131,216.557 MASK | 2.0697% |
15 | LBank | MASK-USDT | $2.53 0.0007457 Eth | $285,908.00 113,046.030 MASK | 1.7831% |
16 | Websea | MASK-USDT | $2.53 0.0007453 Eth | $250,260.00 0.000 MASK | 0.0000% |
17 | Hotcoin | MASK-USDT | $2.53 0.0007462 Eth | $195,141.00 77,098.600 MASK | 1.2161% |
18 | BitDelta | MASK-USDT | $2.53 0.0007453 Eth | $175,632.00 68,955.100 MASK | 1.0877% |
19 | Icrypex | MASK-USDT | $2.52 0.0007412 Eth | $173,409.00 68,907.677 MASK | 1.0869% |
20 | Coinbase Exchange | MASK-USD | $2.53 0.0007459 Eth | $170,985.00 67,582.950 MASK | 1.0660% |
21 | DigiFinex | MASK-USDT | $2.53 0.0007466 Eth | $161,936.00 63,950.255 MASK | 1.0087% |
22 | Tapbit | MASK-USDT | $2.53 0.0007461 Eth | $161,644.00 63,530.600 MASK | 1.0021% |
23 | Bitunix | MASK-USDT | $2.53 0.0007461 Eth | $142,370.00 56,183.760 MASK | 0.8862% |
24 | AscendEX (BitMax) | MASK-USDT | $2.53 0.0007451 Eth | $135,087.00 53,454.800 MASK | 0.8432% |
25 | Icrypex | MASK-TRY | $2.55 0.0007529 Eth | $117,576.00 46,043.471 MASK | 0.7263% |
26 | OrangeX | MASK-USDT | $2.53 0.0007468 Eth | $111,918.00 44,091.263 MASK | 0.6955% |
27 | BitMart | MASK-USDT | $2.53 0.0007467 Eth | $87,008.00 34,350.480 MASK | 0.5418% |
28 | LATOKEN | MASK-USDT | $2.54 0.0007465 Eth | $75,130.00 29,633.733 MASK | 0.4674% |
29 | Phemex | MASK-USDT | $2.53 0.0007458 Eth | $71,817.00 28,354.124 MASK | 0.4472% |
30 | Gate.io | MASK-USDT | $2.53 0.0007460 Eth | $69,492.00 27,325.950 MASK | 0.4310% |
31 | Binance | MASK-BNB | $2.54 0.0007519 Eth | $68,016.00 25,530.900 MASK | 0.4027% |
32 | BingX | MASK-USDT | $2.53 0.0007457 Eth | $64,166.00 25,184.864 MASK | 0.3973% |
33 | Dex-Trade | MASK-USDT | $2.53 0.0007462 Eth | $58,432.00 23,084.900 MASK | 0.3641% |
34 | bitcastle | MASK-USDT | $2.53 0.0007465 Eth | $45,982.00 18,100.400 MASK | 0.2855% |
35 | FMFW.io | MASK-USDT | $2.53 0.0007451 Eth | $44,777.00 17,715.080 MASK | 0.2794% |
36 | HitBTC | MASK-USDT | $2.53 0.0007458 Eth | $44,623.00 17,717.510 MASK | 0.2795% |
37 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.53 0.0007474 Eth | $34,869.00 13,644.771 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.2152% |
38 | Bitvavo | MASK-EUR | $2.54 0.0007480 Eth | $34,625.00 13,647.059 MASK | 0.2153% |
39 | BtcTurk | Kripto | MASK-TRY | $2.54 0.0007491 Eth | $26,275.00 10,327.660 MASK | 0.1629% |
40 | MEXC | MASK-USDT | $2.53 0.0007456 Eth | $25,941.00 10,247.440 MASK | 0.1616% |
41 | CoinW | MASK-USDT | $2.53 0.0007455 Eth | $20,860.00 8,238.244 MASK | 0.1299% |
42 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.54 0.0007490 Eth | $20,789.00 8,145.075 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1285% |
43 | Cryptology | MASK-USDT | $2.53 0.0007459 Eth | $20,128.00 7,955.400 MASK | 0.1255% |
44 | BTSE | MASK-USDT | $2.53 0.0007464 Eth | $20,110.00 7,943.043 MASK | 0.1253% |
45 | Binance | MASK-TRY | $2.54 0.0007506 Eth | $19,906.00 7,764.400 MASK | 0.1225% |
46 | Bitci TR | MASK-TRY | $2.53 0.0007468 Eth | $15,316.89 5,971.060 MASK | 0.0942% |
47 | Kraken | MASK-USD | $2.52 0.0007436 Eth | $15,205.81 6,029.268 MASK | 0.0951% |
48 | Websea | MASK-BTC | $2.53 0.0007460 Eth | $13,890.84 0.000 MASK | 0.0000% |
49 | Pionex | MASK-USDT | $2.53 0.0007461 Eth | $12,975.14 5,087.021 MASK | 0.0802% |
50 | Kanga | MASK-USDT | $2.53 0.0007456 Eth | $11,065.23 0.000 MASK | 0.0000% |
51 | Crypto.com Exchange | MASK-USDT | $2.53 0.0007460 Eth | $10,743.17 4,246.100 MASK | 0.0670% |
52 | Coinbase Exchange | MASK-USDT | $2.54 0.0007477 Eth | $9,378.49 3,697.970 MASK | 0.0583% |
53 | Gate.io | MASK-ETH | $2.53 0.0007461 Eth | $9,023.59 3,546.792 MASK | 0.0559% |
54 | Coinbase Exchange | MASK-EUR | $2.53 0.0007459 Eth | $7,040.04 2,782.670 MASK | 0.0439% |
55 | Dex-Trade | MASK-BNB | $2.53 0.0007471 Eth | $4,500.07 1,775.600 MASK | 0.0280% |
56 | BtcTurk | Kripto | MASK-USDT | $2.53 0.0007458 Eth | $4,332.23 1,710.420 MASK | 0.0270% |
57 | WEEX | MASK-USDT | $2.53 0.0007460 Eth | $3,685.46 1,445.018 MASK | 0.0228% |
58 | Paribu | MASK-TRY | $2.52 0.0007444 Eth | $3,348.96 1,326.390 MASK | 0.0209% |
59 | Bitlo | MASK-TRY | $2.55 0.0007513 Eth | $3,244.69 1,252.512 MASK | 0.0198% |
60 | CoinEx | MASK-USDT | $2.53 0.0007436 Eth | $3,180.49 1,250.978 MASK | 0.0197% |
61 | Koinpark | MASK-USDT | $2.53 0.0007463 Eth | $3,041.45 1,201.619 MASK | 0.0190% |
62 | Crypto.com Exchange | MASK-USD | $2.53 0.0007458 Eth | $2,724.63 1,077.100 MASK | 0.0170% |
63 | Coinbase Exchange | MASK-GBP | $2.53 0.0007459 Eth | $2,594.82 1,025.700 MASK | 0.0162% |
64 | Max Maicoin | MASK-USDT | $2.53 0.0007464 Eth | $1,603.12 633.300 MASK | 0.0100% |
65 | Mudrex | MASK-USDT | $2.53 0.0007453 Eth | $1,016.43 401.669 MASK | 0.0063% |
66 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.53 0.0007453 Eth | $857.51 335.626 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0053% |
67 | Gemini | MASK-USD | $2.52 0.0007436 Eth | $511.06 202.642 MASK | 0.0032% |
68 | Bitbank | MASK-JPY | $2.54 0.0007498 Eth | $472.08 185.619 MASK | 0.0029% |
69 | Pancakeswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.55 0.0007525 Eth | $396.19 155.406 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0025% |
70 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.57 0.0007595 Eth | $328.35 126.414 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0020% |
71 | OKX | MASK-USDC | $2.55 0.0007516 Eth | $325.54 129.211 MASK | 0.0020% |
72 | Pancakeswap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.53 0.0007463 Eth | $286.40 111.645 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0018% |
73 | OKCoin Japan | MASK-JPY | $2.55 0.0007529 Eth | $242.40 94.547 MASK | 0.0015% |
74 | TokoCrypto | MASK-BNB | $2.55 0.0007519 Eth | $216.00 84.610 MASK | 0.0013% |
75 | Matcha (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.49 0.0007169 Eth | $186.26 74.856 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0012% |
76 | Pancakeswap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.53 0.0007467 Eth | $168.10 65.098 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0010% |
77 | Upbit | MASK-BTC | $2.55 0.0007513 Eth | $125.72 49.338 MASK | 0.0008% |
78 | Indodax | MASK-IDR | $2.55 0.0007522 Eth | $115.04 45.048 MASK | 0.0007% |
79 | Nominex | MASK-USDT | $2.53 0.0007463 Eth | $108.23 42.733 MASK | 0.0007% |
80 | Kraken | MASK-EUR | $2.53 0.0007462 Eth | $78.64 31.070 MASK | 0.0005% |
81 | Bit2Me | MASK-EUR | $2.53 0.0007454 Eth | $77.07 30.449 MASK | 0.0005% |
82 | Sushiswap | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.51 0.0007396 Eth | $62.44 24.860 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0004% |
83 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7 | $2.53 0.0007476 Eth | $47.25 18.668 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0003% |
84 | Matcha (Polygon) | 0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174-0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | $2.45 0.0007212 Eth | $45.03 45.034 0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | 0.0007% |
85 | Pancakeswap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.55 0.0007538 Eth | $41.75 16.204 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0003% |
86 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.59 0.0007579 Eth | $33.75 13.042 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0002% |
87 | TokoCrypto | MASK-USDT | $2.53 0.0007458 Eth | $29.35 11.586 MASK | 0.0002% |
88 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.54 0.0007487 Eth | $21.16 8.266 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
89 | Binance US | MASK-USDT | $2.53 0.0007464 Eth | $17.75 7.004 MASK | 0.0001% |
90 | Gate.io | MASK-TRY | $2.55 0.0007532 Eth | $12.26 4.715 MASK | 0.0001% |
91 | Nominex | MASK-BNB | $2.51 0.0007432 Eth | $7.61 3.034 MASK | 0.0000% |
92 | Nominex | MASK-TRY | $2.53 0.0007472 Eth | $7.01 2.775 MASK | 0.0000% |
93 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.55 0.0007510 Eth | $4.84 1.897 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
94 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.55 0.0007548 Eth | $3.37 1.318 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 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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