Overview
Max Total Supply
100,000,000 MASK
Holders
13,859 ( -0.022%)
Market
Price
$2.83 @ 0.000840 ETH (+1.05%)
Onchain Market Cap
$283,000,000.00
Circulating Supply Market Cap
$282,303,795.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
24,213.949714348538220096 MASKValue
$68,525.48 ( ~20.3407 Eth) [0.0242%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Bitrue | MASK-USDT | $2.83 0.0008389 Eth | $8,580,009.00 3,034,006.900 MASK | 19.6830% |
2 | LBank | MASK-USDT | $2.82 0.0008387 Eth | $7,566,536.00 2,679,065.050 MASK | 17.3803% |
3 | BTCC | MASK-USDT | $2.82 0.0008391 Eth | $6,330,970.00 2,260,280.500 MASK | 14.6635% |
4 | Binance | MASK-USDT | $2.82 0.0008375 Eth | $3,386,893.00 1,213,860.000 MASK | 7.8749% |
5 | Bibox | MASK-USDT | $2.84 0.0008428 Eth | $2,706,041.00 951,776.000 MASK | 6.1746% |
6 | HTX | MASK-USDT | $2.83 0.0008384 Eth | $2,259,516.00 807,113.622 MASK | 5.2361% |
7 | Upbit | MASK-KRW | $2.86 0.0008469 Eth | $1,616,605.00 565,950.964 MASK | 3.6716% |
8 | Hotcoin | MASK-USDT | $2.82 0.0008387 Eth | $1,427,811.00 505,543.400 MASK | 3.2797% |
9 | Websea | MASK-USDT | $2.83 0.0008390 Eth | $1,238,713.00 0.000 MASK | 0.0000% |
10 | Bybit | MASK-USDT | $2.83 0.0008387 Eth | $1,135,755.00 406,809.520 MASK | 2.6392% |
11 | OKX | MASK-USDT | $2.83 0.0008381 Eth | $989,060.00 354,096.244 MASK | 2.2972% |
12 | Trubit | MASK-USDT | $2.82 0.0008374 Eth | $938,885.00 335,025.100 MASK | 2.1735% |
13 | BYDFi | MASK-USDT | $2.82 0.0008378 Eth | $737,026.00 261,265.200 MASK | 1.6949% |
14 | Biconomy.com | MASK-USDT | $2.82 0.0008389 Eth | $713,222.00 254,888.728 MASK | 1.6536% |
15 | Gate.io | MASK-USDT | $2.82 0.0008369 Eth | $642,463.00 230,716.300 MASK | 1.4968% |
16 | Deepcoin | MASK-USDT | $2.82 0.0008378 Eth | $537,556.00 198,091.600 MASK | 1.2851% |
17 | Bitget | MASK-USDT | $2.83 0.0008387 Eth | $331,101.00 118,571.055 MASK | 0.7692% |
18 | MEXC | MASK-USDT | $2.83 0.0008389 Eth | $328,451.00 116,144.850 MASK | 0.7535% |
19 | Bitunix | MASK-USDT | $2.83 0.0008383 Eth | $301,112.00 106,514.800 MASK | 0.6910% |
20 | Ourbit | MASK-USDT | $2.82 0.0008381 Eth | $250,944.00 89,841.460 MASK | 0.5828% |
21 | Bithumb | MASK-KRW | $2.86 0.0008468 Eth | $245,340.00 85,910.969 MASK | 0.5573% |
22 | Toobit | MASK-USDT | $2.83 0.0008383 Eth | $238,305.00 85,298.630 MASK | 0.5534% |
23 | BtcTurk | Kripto | MASK-TRY | $2.80 0.0008312 Eth | $226,824.00 81,044.750 MASK | 0.5258% |
24 | BitDelta | MASK-USDT | $2.83 0.0008387 Eth | $213,991.00 76,439.500 MASK | 0.4959% |
25 | CoinW | MASK-USDT | $2.83 0.0008391 Eth | $205,921.00 72,888.408 MASK | 0.4729% |
26 | Icrypex | MASK-USDT | $2.84 0.0008434 Eth | $201,880.00 71,129.634 MASK | 0.4615% |
27 | CoinEx | MASK-USDT | $2.81 0.0008345 Eth | $179,456.00 64,931.530 MASK | 0.4212% |
28 | KuCoin | MASK-USDT | $2.82 0.0008365 Eth | $175,450.00 62,172.551 MASK | 0.4033% |
29 | OrangeX | MASK-USDT | $2.82 0.0008380 Eth | $166,859.00 59,703.380 MASK | 0.3873% |
30 | BIT | MASK-USDT | $2.82 0.0008367 Eth | $166,684.00 59,125.270 MASK | 0.3836% |
31 | Coinbase Exchange | MASK-USD | $2.83 0.0008404 Eth | $158,455.00 55,991.130 MASK | 0.3632% |
32 | Phemex | MASK-USDT | $2.81 0.0008346 Eth | $152,344.00 54,212.757 MASK | 0.3517% |
33 | AscendEX (BitMax) | MASK-USDT | $2.83 0.0008404 Eth | $146,370.00 51,636.800 MASK | 0.3350% |
34 | DigiFinex | MASK-USDT | $2.83 0.0008388 Eth | $137,291.00 48,529.695 MASK | 0.3148% |
35 | BVOX | MASK-USDT | $2.82 0.0008380 Eth | $136,175.00 48,647.300 MASK | 0.3156% |
36 | CoinTR | MASK-TRY | $2.80 0.0008317 Eth | $133,447.00 47,757.500 MASK | 0.3098% |
37 | Byte Exchange | MASK-USDT | $2.82 0.0008366 Eth | $131,355.00 46,624.954 MASK | 0.3025% |
38 | Tapbit | MASK-USDT | $2.83 0.0008381 Eth | $122,371.00 43,714.200 MASK | 0.2836% |
39 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.83 0.0008397 Eth | $115,179.00 41,132.063 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.2668% |
40 | BitMart | MASK-USDT | $2.82 0.0008387 Eth | $105,855.00 37,477.980 MASK | 0.2431% |
41 | Dex-Trade | MASK-USDT | $2.83 0.0008394 Eth | $100,637.00 35,609.174 MASK | 0.2310% |
42 | Hibt | MASK-USDT | $2.83 0.0008384 Eth | $89,015.00 31,868.662 MASK | 0.2067% |
43 | ProBit Global | MASK-USDT | $2.83 0.0008384 Eth | $81,092.00 28,670.790 MASK | 0.1860% |
44 | BTSE | MASK-USDT | $2.83 0.0008390 Eth | $80,352.00 28,441.302 MASK | 0.1845% |
45 | BingX | MASK-USDT | $2.83 0.0008381 Eth | $72,873.00 26,068.654 MASK | 0.1691% |
46 | FameEX | MASK-USDT | $2.82 0.0008388 Eth | $70,756.00 25,340.500 MASK | 0.1644% |
47 | BloFin | MASK-USDT | $2.83 0.0008408 Eth | $55,470.00 19,819.900 MASK | 0.1286% |
48 | PointPay | MASK-USDT | $2.82 0.0008387 Eth | $53,508.00 19,162.632 MASK | 0.1243% |
49 | Binance | MASK-TRY | $2.81 0.0008348 Eth | $47,890.00 17,183.800 MASK | 0.1115% |
50 | CoinTR | MASK-USDT | $2.83 0.0008383 Eth | $45,115.00 16,135.300 MASK | 0.1047% |
51 | Bitvavo | MASK-EUR | $2.83 0.0008406 Eth | $43,051.00 15,210.795 MASK | 0.0987% |
52 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.83 0.0008400 Eth | $42,364.00 15,156.416 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0983% |
53 | Bitbank | MASK-JPY | $2.82 0.0008384 Eth | $41,807.00 14,809.049 MASK | 0.0961% |
54 | BtcTurk | Kripto | MASK-USDT | $2.81 0.0008333 Eth | $35,944.00 12,808.480 MASK | 0.0831% |
55 | Pionex | MASK-USDT | $2.83 0.0008397 Eth | $33,145.00 11,878.688 MASK | 0.0771% |
56 | Koinpark | MASK-USDT | $2.82 0.0008377 Eth | $31,486.00 11,168.625 MASK | 0.0725% |
57 | Binance | MASK-BNB | $2.83 0.0008399 Eth | $28,116.00 9,990.600 MASK | 0.0648% |
58 | Kraken | MASK-USD | $2.82 0.0008361 Eth | $22,846.00 8,101.585 MASK | 0.0526% |
59 | Tothemoon | MASK-USDT | $2.83 0.0008393 Eth | $22,544.00 7,977.700 MASK | 0.0518% |
60 | Bitci TR | MASK-TRY | $2.79 0.0008277 Eth | $15,049.86 5,383.120 MASK | 0.0349% |
61 | LATOKEN | MASK-USDT | $2.82 0.0008381 Eth | $13,517.04 4,789.337 MASK | 0.0311% |
62 | Paribu | MASK-TRY | $2.81 0.0008335 Eth | $11,276.70 4,017.480 MASK | 0.0261% |
63 | Kanga | MASK-USDT | $2.83 0.0008394 Eth | $9,381.66 0.000 MASK | 0.0000% |
64 | Coinbase Exchange | MASK-USDT | $2.79 0.0008284 Eth | $9,074.59 3,253.510 MASK | 0.0211% |
65 | Vindax | MASK-USDT | $2.81 0.0008345 Eth | $8,146.95 2,900.200 MASK | 0.0188% |
66 | bitcastle | MASK-USDT | $2.82 0.0008360 Eth | $6,553.65 2,352.200 MASK | 0.0153% |
67 | Max Maicoin | MASK-USDT | $2.75 0.0008160 Eth | $5,649.80 2,054.500 MASK | 0.0133% |
68 | Coinbase Exchange | MASK-EUR | $2.79 0.0008291 Eth | $5,428.09 1,944.110 MASK | 0.0126% |
69 | Crypto.com Exchange | MASK-USD | $2.83 0.0008377 Eth | $4,812.57 1,702.900 MASK | 0.0110% |
70 | Bitlo | MASK-TRY | $2.81 0.0008335 Eth | $3,837.45 1,381.764 MASK | 0.0090% |
71 | Crypto.com Exchange | MASK-USDT | $2.82 0.0008347 Eth | $3,057.21 1,085.700 MASK | 0.0070% |
72 | Gemini | MASK-USD | $2.82 0.0008370 Eth | $2,414.00 855.118 MASK | 0.0055% |
73 | Bittime | MASK-IDR | $2.82 0.0008380 Eth | $2,382.90 864.690 MASK | 0.0056% |
74 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.81 0.0008335 Eth | $2,360.98 843.049 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0055% |
75 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.81 0.0008338 Eth | $2,294.16 829.609 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0054% |
76 | Nami.Exchange | MASK-VNST | $2.84 0.0008438 Eth | $2,259.38 795.250 MASK | 0.0052% |
77 | Nami.Exchange | MASK-USDT | $2.82 0.0008384 Eth | $2,214.34 784.308 MASK | 0.0051% |
78 | CoinDCX | MASK-INR | $3.02 0.0008955 Eth | $1,740.79 0.000 MASK | 0.0000% |
79 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.85 0.0008448 Eth | $1,419.51 500.479 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0032% |
80 | WEEX | MASK-USDT | $2.82 0.0008375 Eth | $1,396.26 499.100 MASK | 0.0032% |
81 | Coinone | MASK-KRW | $2.83 0.0008390 Eth | $1,388.93 490.848 MASK | 0.0032% |
82 | Kraken | MASK-EUR | $2.80 0.0008309 Eth | $1,210.62 432.000 MASK | 0.0028% |
83 | Bit2Me | MASK-EUR | $2.80 0.0008323 Eth | $1,176.58 423.360 MASK | 0.0027% |
84 | OKX | MASK-USDC | $2.83 0.0008390 Eth | $1,020.18 364.135 MASK | 0.0024% |
85 | Dex-Trade | MASK-BNB | $2.84 0.0008429 Eth | $709.25 249.900 MASK | 0.0016% |
86 | Binance US | MASK-USDT | $2.85 0.0008456 Eth | $583.04 204.780 MASK | 0.0013% |
87 | TokoCrypto | MASK-USDT | $2.80 0.0008393 Eth | $520.73 186.060 MASK | 0.0012% |
88 | OKJ | MASK-JPY | $2.79 0.0008279 Eth | $476.99 169.137 MASK | 0.0011% |
89 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.78 0.0008243 Eth | $457.06 166.878 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0011% |
90 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.82 0.0008377 Eth | $127.44 45.798 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0003% |
91 | Coinbase Exchange | MASK-GBP | $2.80 0.0008305 Eth | $102.85 36.780 MASK | 0.0002% |
92 | Mercado Bitcoin | MASK-BRL | $2.73 0.0008090 Eth | $92.38 33.846 MASK | 0.0002% |
93 | Bancor (V2) | MASK-BNT | $3.32 0.0009843 Eth | $54.68 16.472 MASK | 0.0001% |
94 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.82 0.0008386 Eth | $39.77 14.064 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
95 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.83 0.0008404 Eth | $30.73 10.715 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0001% |
96 | CEX.IO | MASK-USD | $2.83 0.0008389 Eth | $23.82 8.534 MASK | 0.0001% |
97 | CEX.IO | MASK-USDT | $2.81 0.0008356 Eth | $21.00 7.468 MASK | 0.0000% |
98 | Indodax | MASK-IDR | $2.54 0.0007530 Eth | $20.96 8.266 MASK | 0.0001% |
99 | Upbit | MASK-BTC | $2.84 0.0008421 Eth | $13.06 4.600 MASK | 0.0000% |
100 | Poloniex | MASK-USDT | $3.81 0.0011302 Eth | $2.01 0.529 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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