Overview
Max Total Supply
100,000,000 MASK
Holders
13,855 ( -0.029%)
Market
Price
$2.93 @ 0.000916 ETH (+4.52%)
Onchain Market Cap
$293,000,000.00
Circulating Supply Market Cap
$292,503,155.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.000000000000000001 MASKValue
$0.00 ( ~0 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | BTCC | MASK-USDT | $2.93 0.0009123 Eth | $56,586,844.00 19,642,266.200 MASK | 18.1082% |
2 | Bitrue | MASK-USDT | $2.93 0.0009120 Eth | $46,398,565.00 15,845,187.600 MASK | 14.6077% |
3 | Binance | MASK-USDT | $2.90 0.0009027 Eth | $41,353,988.00 14,363,906.500 MASK | 13.2421% |
4 | Upbit | MASK-KRW | $2.94 0.0009152 Eth | $28,630,412.00 9,737,424.819 MASK | 8.9769% |
5 | OKX | MASK-USDT | $2.91 0.0009048 Eth | $15,341,186.00 5,295,486.453 MASK | 4.8819% |
6 | Bibox | MASK-USDT | $2.94 0.0009173 Eth | $12,473,977.00 4,235,926.000 MASK | 3.9051% |
7 | Gate.io | MASK-USDT | $2.92 0.0009081 Eth | $11,419,688.00 3,950,180.990 MASK | 3.6417% |
8 | Bybit | MASK-USDT | $2.91 0.0009047 Eth | $9,082,665.00 3,143,285.770 MASK | 2.8978% |
9 | Bithumb | MASK-KRW | $2.93 0.0009121 Eth | $8,888,814.00 3,033,389.978 MASK | 2.7965% |
10 | BYDFi | MASK-USDT | $2.92 0.0009107 Eth | $7,354,418.00 2,517,634.100 MASK | 2.3210% |
11 | Bitunix | MASK-USDT | $2.93 0.0009123 Eth | $6,640,583.00 2,268,347.240 MASK | 2.0912% |
12 | Hotcoin | MASK-USDT | $2.91 0.0009039 Eth | $6,365,938.00 2,188,106.300 MASK | 2.0172% |
13 | Nami.Exchange | MASK-USDT | $2.93 0.0009129 Eth | $6,356,055.00 2,170,712.300 MASK | 2.0012% |
14 | Nami.Exchange | MASK-VNST | $2.91 0.0009064 Eth | $5,659,891.00 1,945,999.900 MASK | 1.7940% |
15 | Websea | MASK-USDT | $2.93 0.0009113 Eth | $5,609,464.00 0.000 MASK | 0.0000% |
16 | MEXC | MASK-USDT | $2.91 0.0009056 Eth | $5,588,265.00 1,920,872.990 MASK | 1.7709% |
17 | HTX | MASK-USDT | $2.92 0.0009088 Eth | $4,150,032.00 1,436,492.453 MASK | 1.3243% |
18 | WhiteBIT | MASK-USDT | $2.92 0.0009094 Eth | $4,048,158.00 1,385,337.149 MASK | 1.2771% |
19 | Toobit | MASK-USDT | $2.92 0.0009081 Eth | $3,934,499.00 1,363,525.280 MASK | 1.2570% |
20 | Ourbit | MASK-USDT | $2.91 0.0009051 Eth | $2,920,830.00 1,013,937.170 MASK | 0.9347% |
21 | BtcTurk | Kripto | MASK-TRY | $2.90 0.0009009 Eth | $2,521,241.00 868,433.200 MASK | 0.8006% |
22 | Deepcoin | MASK-USDT | $2.92 0.0009113 Eth | $2,264,589.00 909,360.643 MASK | 0.8383% |
23 | Bitget | MASK-USDT | $2.90 0.0009042 Eth | $2,125,717.00 734,853.140 MASK | 0.6775% |
24 | Biconomy.com | MASK-USDT | $2.92 0.0009102 Eth | $2,096,874.00 726,397.785 MASK | 0.6697% |
25 | Binance | MASK-TRY | $2.92 0.0009073 Eth | $1,660,255.00 572,848.800 MASK | 0.5281% |
26 | BTSE | MASK-USDT | $2.92 0.0009097 Eth | $1,540,048.00 526,827.815 MASK | 0.4857% |
27 | LBank | MASK-USDT | $2.91 0.0009045 Eth | $1,350,219.00 464,680.510 MASK | 0.4284% |
28 | DigiFinex | MASK-USDT | $2.91 0.0009059 Eth | $1,159,685.00 398,485.279 MASK | 0.3674% |
29 | bitcastle | MASK-USDT | $2.92 0.0009098 Eth | $1,130,108.00 391,147.100 MASK | 0.3606% |
30 | KuCoin | MASK-USDT | $2.92 0.0009107 Eth | $1,045,875.00 357,706.885 MASK | 0.3298% |
31 | Dex-Trade | MASK-USDT | $2.92 0.0009075 Eth | $1,014,835.00 347,994.200 MASK | 0.3208% |
32 | Trubit | MASK-USDT | $2.91 0.0009054 Eth | $998,562.00 344,059.100 MASK | 0.3172% |
33 | Phemex | MASK-USDT | $2.92 0.0009110 Eth | $979,117.00 335,069.061 MASK | 0.3089% |
34 | FameEX | MASK-USDT | $2.91 0.0009036 Eth | $890,815.00 310,051.700 MASK | 0.2858% |
35 | OrangeX | MASK-USDT | $2.93 0.0009138 Eth | $878,080.00 304,913.390 MASK | 0.2811% |
36 | Byte Exchange | MASK-USDT | $2.93 0.0009120 Eth | $811,846.00 277,537.500 MASK | 0.2559% |
37 | CoinW | MASK-USDT | $2.92 0.0009089 Eth | $666,740.00 228,610.226 MASK | 0.2108% |
38 | PointPay | MASK-USDT | $2.92 0.0009110 Eth | $629,208.00 217,758.243 MASK | 0.2008% |
39 | Bitvavo | MASK-EUR | $2.90 0.0009025 Eth | $602,356.00 207,995.321 MASK | 0.1918% |
40 | BingX | MASK-USDT | $2.91 0.0009053 Eth | $559,222.00 193,709.659 MASK | 0.1786% |
41 | Paribu | MASK-TRY | $2.92 0.0009086 Eth | $550,979.00 188,977.860 MASK | 0.1742% |
42 | Coinbase Exchange | MASK-USD | $2.92 0.0009096 Eth | $414,620.00 141,993.230 MASK | 0.1309% |
43 | BtcTurk | Kripto | MASK-USDT | $2.92 0.0009094 Eth | $408,910.00 140,065.290 MASK | 0.1291% |
44 | BIT | MASK-USDT | $2.92 0.0009105 Eth | $400,819.00 137,173.873 MASK | 0.1265% |
45 | BitMart | MASK-USDT | $2.92 0.0009104 Eth | $378,462.00 129,480.160 MASK | 0.1194% |
46 | Koinpark | MASK-USDT | $2.92 0.0009110 Eth | $375,931.00 128,647.793 MASK | 0.1186% |
47 | Tapbit | MASK-USDT | $2.92 0.0009096 Eth | $354,419.00 122,644.700 MASK | 0.1131% |
48 | Icrypex | MASK-USDT | $2.91 0.0009070 Eth | $350,449.00 120,463.960 MASK | 0.1111% |
49 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.92 0.0009100 Eth | $322,506.00 111,848.122 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1031% |
50 | BitDelta | MASK-USDT | $2.90 0.0009033 Eth | $322,306.00 111,916.300 MASK | 0.1032% |
51 | Bitbank | MASK-JPY | $2.93 0.0009116 Eth | $291,226.00 99,507.706 MASK | 0.0917% |
52 | CoinEx | MASK-USDT | $2.92 0.0009082 Eth | $280,456.00 95,964.851 MASK | 0.0885% |
53 | Pionex | MASK-USDT | $2.92 0.0009110 Eth | $275,028.00 95,490.717 MASK | 0.0880% |
54 | ProBit Global | MASK-USDT | $2.92 0.0009091 Eth | $242,885.00 83,280.576 MASK | 0.0768% |
55 | CoinTR | MASK-TRY | $2.92 0.0009118 Eth | $165,701.00 57,221.400 MASK | 0.0528% |
56 | BloFin | MASK-USDT | $2.92 0.0009096 Eth | $158,257.00 54,958.400 MASK | 0.0507% |
57 | AscendEX (BitMax) | MASK-USDT | $2.93 0.0009131 Eth | $141,274.00 48,192.600 MASK | 0.0444% |
58 | CoinTR | MASK-USDT | $2.92 0.0009101 Eth | $135,754.00 46,972.800 MASK | 0.0433% |
59 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.91 0.0009062 Eth | $135,672.00 47,061.093 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0434% |
60 | Vindax | MASK-USDT | $2.90 0.0009033 Eth | $125,893.00 43,434.100 MASK | 0.0400% |
61 | Kraken | MASK-USD | $2.92 0.0009083 Eth | $119,767.00 41,072.523 MASK | 0.0379% |
62 | Binance | MASK-BNB | $2.91 0.0009060 Eth | $114,026.00 38,373.000 MASK | 0.0354% |
63 | LATOKEN | MASK-USDT | $2.92 0.0009094 Eth | $90,977.00 31,132.515 MASK | 0.0287% |
64 | OKX | MASK-USDC | $2.91 0.0009052 Eth | $85,127.00 29,571.853 MASK | 0.0273% |
65 | Nominex | MASK-USDT | $2.91 0.0009067 Eth | $48,003.00 16,472.441 MASK | 0.0152% |
66 | TokoCrypto | MASK-USDT | $2.91 0.0009048 Eth | $36,230.00 12,461.232 MASK | 0.0115% |
67 | Coinbase Exchange | MASK-GBP | $2.91 0.0009063 Eth | $34,233.00 11,766.980 MASK | 0.0108% |
68 | Crypto.com Exchange | MASK-USD | $2.92 0.0009091 Eth | $31,852.00 10,903.700 MASK | 0.0101% |
69 | Coinone | MASK-KRW | $2.96 0.0009221 Eth | $28,103.00 9,485.014 MASK | 0.0087% |
70 | Coinbase Exchange | MASK-USDT | $2.91 0.0009079 Eth | $26,260.00 9,010.080 MASK | 0.0083% |
71 | Crypto.com Exchange | MASK-USDT | $2.92 0.0009084 Eth | $26,228.00 8,985.300 MASK | 0.0083% |
72 | Max Maicoin | MASK-USDT | $2.92 0.0009090 Eth | $24,891.00 8,537.200 MASK | 0.0079% |
73 | Coinbase Exchange | MASK-EUR | $2.90 0.0009036 Eth | $24,251.00 8,360.720 MASK | 0.0077% |
74 | Cryptology | MASK-USDT | $2.92 0.0009083 Eth | $23,339.00 8,004.200 MASK | 0.0074% |
75 | WEEX | MASK-USDT | $2.93 0.0009117 Eth | $20,277.00 7,023.000 MASK | 0.0065% |
76 | Gemini | MASK-USD | $2.92 0.0009075 Eth | $18,756.36 6,432.222 MASK | 0.0059% |
77 | Bitci TR | MASK-TRY | $2.94 0.0009121 Eth | $15,527.36 5,369.342 MASK | 0.0049% |
78 | Kanga | MASK-USDT | $2.91 0.0009051 Eth | $15,517.46 0.000 MASK | 0.0000% |
79 | Kraken | MASK-EUR | $2.91 0.0009077 Eth | $9,604.08 3,295.540 MASK | 0.0030% |
80 | Bit2Me | MASK-EUR | $2.91 0.0009085 Eth | $9,216.84 3,229.629 MASK | 0.0030% |
81 | Bitlo | MASK-TRY | $2.93 0.0009112 Eth | $8,479.39 2,947.551 MASK | 0.0027% |
82 | Upbit | MASK-BTC | $2.88 0.0008967 Eth | $8,078.41 2,804.210 MASK | 0.0026% |
83 | Binance US | MASK-USDT | $2.88 0.0008982 Eth | $7,779.69 2,700.242 MASK | 0.0025% |
84 | OKCoin Japan | MASK-JPY | $2.95 0.0009160 Eth | $6,900.87 2,383.101 MASK | 0.0022% |
85 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.92 0.0009097 Eth | $6,467.67 2,246.454 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0021% |
86 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.94 0.0009167 Eth | $4,791.92 1,650.396 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0015% |
87 | PancakeSwap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.89 0.0009009 Eth | $3,697.19 1,281.897 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0012% |
88 | Dex-Trade | MASK-BNB | $2.95 0.0009177 Eth | $3,111.72 1,054.400 MASK | 0.0010% |
89 | Gate.io | MASK-TRY | $2.91 0.0009065 Eth | $2,149.71 730.282 MASK | 0.0007% |
90 | Bittime | MASK-IDR | $2.91 0.0009079 Eth | $2,053.07 704.810 MASK | 0.0006% |
91 | Nominex | MASK-TRY | $2.92 0.0009062 Eth | $1,888.08 646.776 MASK | 0.0006% |
92 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.92 0.0009090 Eth | $1,643.65 543.704 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0005% |
93 | Indodax | MASK-IDR | $2.95 0.0009189 Eth | $776.40 263.373 MASK | 0.0002% |
94 | CEX.IO | MASK-USD | $2.91 0.0009046 Eth | $343.48 117.620 MASK | 0.0001% |
95 | Gate.io | MASK-ETH | $2.90 0.0009022 Eth | $310.20 106.941 MASK | 0.0001% |
96 | CEX.IO | MASK-USDT | $2.92 0.0009098 Eth | $228.05 77.866 MASK | 0.0001% |
97 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.90 0.0009052 Eth | $131.30 44.518 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0000% |
98 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.92 0.0009087 Eth | $131.02 44.123 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0000% |
99 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.92 0.0009092 Eth | $130.03 44.239 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0000% |
100 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.91 0.0009083 Eth | $15.63 5.540 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 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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