Overview
Max Total Supply
100,000,000 MASK
Holders
13,910 ( 0.043%)
Market
Price
$3.52 @ 0.000981 ETH (-8.03%)
Onchain Market Cap
$352,000,000.00
Circulating Supply Market Cap
$352,026,001.00
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | BTCC | MASK-USDT | $3.48 0.0009724 Eth | $36,136,351.00 9,625,725.400 MASK | 20.6232% |
2 | Binance | MASK-USDT | $3.51 0.0009768 Eth | $18,244,842.00 4,900,064.800 MASK | 10.4984% |
3 | Bitrue | MASK-USDT | $3.49 0.0009763 Eth | $17,024,798.00 4,871,901.600 MASK | 10.4381% |
4 | Upbit | MASK-KRW | $3.48 0.0009697 Eth | $17,020,836.00 4,893,721.535 MASK | 10.4848% |
5 | Websea | MASK-USDT | $3.51 0.0009756 Eth | $9,564,841.00 0.000 MASK | 0.0000% |
6 | LBank | MASK-USDT | $3.53 0.0009799 Eth | $8,505,129.00 2,412,078.320 MASK | 5.1679% |
7 | Gate.io | MASK-USDT | $3.49 0.0009763 Eth | $6,949,301.00 1,888,207.300 MASK | 4.0455% |
8 | OKX | MASK-USDT | $3.51 0.0009793 Eth | $5,301,383.00 1,422,134.358 MASK | 3.0469% |
9 | Nami.Exchange | MASK-USDT | $3.50 0.0009777 Eth | $5,093,258.00 1,456,631.000 MASK | 3.1208% |
10 | Bithumb | MASK-KRW | $3.47 0.0009713 Eth | $4,572,033.00 1,316,137.495 MASK | 2.8198% |
11 | Nami.Exchange | MASK-VNST | $3.51 0.0009761 Eth | $4,510,493.00 1,286,772.000 MASK | 2.7569% |
12 | Bybit | MASK-USDT | $3.52 0.0009805 Eth | $4,249,642.00 1,146,984.700 MASK | 2.4574% |
13 | MEXC | MASK-USDT | $3.49 0.0009757 Eth | $4,187,309.00 1,198,161.140 MASK | 2.5671% |
14 | BYDFi | MASK-USDT | $3.48 0.0009720 Eth | $3,336,165.00 958,669.200 MASK | 2.0540% |
15 | WhiteBIT | MASK-USDT | $3.50 0.0009766 Eth | $2,976,334.00 850,192.183 MASK | 1.8215% |
16 | HTX | MASK-USDT | $3.52 0.0009813 Eth | $2,698,940.00 717,723.276 MASK | 1.5377% |
17 | Bitunix | MASK-USDT | $3.47 0.0009710 Eth | $2,580,289.00 743,021.970 MASK | 1.5919% |
18 | Bibox | MASK-USDT | $3.52 0.0009834 Eth | $2,387,262.00 678,256.000 MASK | 1.4532% |
19 | Toobit | MASK-USDT | $3.51 0.0009759 Eth | $1,788,665.00 479,739.510 MASK | 1.0278% |
20 | Deepcoin | MASK-USDT | $3.47 0.0009696 Eth | $1,662,962.00 456,900.258 MASK | 0.9789% |
21 | Bitget | MASK-USDT | $3.51 0.0009797 Eth | $1,635,236.00 433,473.735 MASK | 0.9287% |
22 | Hotcoin | MASK-USDT | $3.48 0.0009723 Eth | $1,541,873.00 442,940.200 MASK | 0.9490% |
23 | Biconomy.com | MASK-USDT | $3.49 0.0009748 Eth | $1,372,231.00 366,425.636 MASK | 0.7851% |
24 | BTSE | MASK-USDT | $3.52 0.0009815 Eth | $1,323,756.00 376,035.754 MASK | 0.8057% |
25 | Ourbit | MASK-USDT | $3.49 0.0009746 Eth | $1,299,885.00 349,150.920 MASK | 0.7481% |
26 | Trubit | MASK-USDT | $3.48 0.0009731 Eth | $1,229,562.00 327,259.100 MASK | 0.7012% |
27 | KuCoin | MASK-USDT | $3.50 0.0009752 Eth | $1,073,906.00 307,172.086 MASK | 0.6581% |
28 | Binance | MASK-TRY | $3.50 0.0009751 Eth | $846,370.00 225,996.100 MASK | 0.4842% |
29 | BtcTurk | Kripto | MASK-TRY | $3.49 0.0009761 Eth | $645,213.00 184,668.940 MASK | 0.3957% |
30 | Phemex | MASK-USDT | $3.51 0.0009805 Eth | $598,658.00 170,331.812 MASK | 0.3649% |
31 | bitcastle | MASK-USDT | $3.53 0.0009795 Eth | $523,375.00 140,473.600 MASK | 0.3010% |
32 | Dex-Trade | MASK-USDT | $3.52 0.0009770 Eth | $516,663.00 146,784.905 MASK | 0.3145% |
33 | Coinbase Exchange | MASK-USD | $3.50 0.0009786 Eth | $460,760.00 131,645.850 MASK | 0.2821% |
34 | Hibt | MASK-USDT | $3.52 0.0009789 Eth | $456,887.00 122,585.693 MASK | 0.2626% |
35 | DigiFinex | MASK-USDT | $3.51 0.0009799 Eth | $412,680.00 117,422.779 MASK | 0.2516% |
36 | FameEX | MASK-USDT | $3.51 0.0009785 Eth | $374,730.00 100,740.600 MASK | 0.2158% |
37 | BitDelta | MASK-USDT | $3.48 0.0009724 Eth | $329,603.00 87,588.200 MASK | 0.1877% |
38 | PointPay | MASK-USDT | $3.51 0.0009776 Eth | $287,457.00 77,329.562 MASK | 0.1657% |
39 | BtcTurk | Kripto | MASK-USDT | $3.52 0.0009787 Eth | $280,256.00 79,639.000 MASK | 0.1706% |
40 | Icrypex | MASK-USDT | $3.47 0.0009681 Eth | $276,525.00 79,782.413 MASK | 0.1709% |
41 | BingX | MASK-USDT | $3.52 0.0009804 Eth | $275,534.00 73,730.847 MASK | 0.1580% |
42 | OrangeX | MASK-USDT | $3.48 0.0009707 Eth | $256,899.00 68,626.350 MASK | 0.1470% |
43 | CoinW | MASK-USDT | $3.49 0.0009758 Eth | $256,280.00 73,359.350 MASK | 0.1572% |
44 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.52 0.0009772 Eth | $241,329.00 64,514.302 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1382% |
45 | Bitvavo | MASK-EUR | $3.52 0.0009842 Eth | $207,584.00 58,889.285 MASK | 0.1262% |
46 | Bitbank | MASK-JPY | $3.48 0.0009740 Eth | $201,735.00 57,891.647 MASK | 0.1240% |
47 | Byte Exchange | MASK-USDT | $3.53 0.0009798 Eth | $190,375.00 53,998.054 MASK | 0.1157% |
48 | BVOX | MASK-USDT | $3.51 0.0009780 Eth | $177,232.00 46,897.600 MASK | 0.1005% |
49 | BitMart | MASK-USDT | $3.49 0.0009751 Eth | $171,529.00 49,133.320 MASK | 0.1053% |
50 | Koinpark | MASK-USDT | $3.50 0.0009768 Eth | $157,724.00 45,041.908 MASK | 0.0965% |
51 | Tapbit | MASK-USDT | $3.51 0.0009730 Eth | $147,463.00 39,226.000 MASK | 0.0840% |
52 | CoinTR | MASK-USDT | $3.47 0.0009707 Eth | $132,077.00 35,020.300 MASK | 0.0750% |
53 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.50 0.0009770 Eth | $131,453.00 35,014.383 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0750% |
54 | CoinTR | MASK-TRY | $3.54 0.0009823 Eth | $128,768.00 34,281.500 MASK | 0.0734% |
55 | CoinEx | MASK-USDT | $3.49 0.0009754 Eth | $128,100.00 34,303.734 MASK | 0.0735% |
56 | AscendEX (BitMax) | MASK-USDT | $3.49 0.0009763 Eth | $127,317.00 36,463.900 MASK | 0.0781% |
57 | ProBit Global | MASK-USDT | $3.50 0.0009764 Eth | $123,643.00 35,327.919 MASK | 0.0757% |
58 | BloFin | MASK-USDT | $3.50 0.0009759 Eth | $118,569.00 31,492.300 MASK | 0.0675% |
59 | Binance | MASK-BNB | $3.50 0.0009769 Eth | $108,644.00 29,814.300 MASK | 0.0639% |
60 | Paribu | MASK-TRY | $3.49 0.0009736 Eth | $76,800.00 22,032.040 MASK | 0.0472% |
61 | Pionex | MASK-USDT | $3.53 0.0009798 Eth | $63,961.00 17,249.482 MASK | 0.0370% |
62 | Kraken | MASK-USD | $3.51 0.0009806 Eth | $56,312.00 16,043.179 MASK | 0.0344% |
63 | LATOKEN | MASK-USDT | $3.49 0.0009749 Eth | $48,462.00 13,879.112 MASK | 0.0297% |
64 | Coinbase Exchange | MASK-EUR | $3.50 0.0009789 Eth | $43,753.00 12,497.720 MASK | 0.0268% |
65 | Coinbase Exchange | MASK-USDT | $3.49 0.0009752 Eth | $43,093.00 12,355.740 MASK | 0.0265% |
66 | Vindax | MASK-USDT | $3.49 0.0009742 Eth | $36,097.00 10,341.700 MASK | 0.0222% |
67 | OKX | MASK-USDC | $3.48 0.0009693 Eth | $34,729.00 9,346.319 MASK | 0.0200% |
68 | Coinbase Exchange | MASK-GBP | $3.53 0.0009867 Eth | $32,904.00 9,324.580 MASK | 0.0200% |
69 | Crypto.com Exchange | MASK-USD | $3.48 0.0009733 Eth | $28,179.00 8,092.500 MASK | 0.0173% |
70 | Tothemoon | MASK-USDT | $3.49 0.0009750 Eth | $27,072.00 7,752.500 MASK | 0.0166% |
71 | Crypto.com Exchange | MASK-USDT | $3.49 0.0009753 Eth | $26,164.00 7,498.200 MASK | 0.0161% |
72 | Coinone | MASK-KRW | $3.49 0.0009739 Eth | $25,086.00 7,196.242 MASK | 0.0154% |
73 | Bitlo | MASK-TRY | $3.50 0.0009776 Eth | $24,653.00 6,639.511 MASK | 0.0142% |
74 | WEEX | MASK-USDT | $3.50 0.0009767 Eth | $23,150.00 6,154.100 MASK | 0.0132% |
75 | Max Maicoin | MASK-USDT | $3.52 0.0009771 Eth | $22,288.00 6,339.200 MASK | 0.0136% |
76 | Bitci TR | MASK-TRY | $3.50 0.0009781 Eth | $21,848.00 5,774.780 MASK | 0.0124% |
77 | TokoCrypto | MASK-USDT | $3.47 0.0009707 Eth | $9,737.94 2,804.488 MASK | 0.0060% |
78 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $3.49 0.0009761 Eth | $9,387.18 2,620.470 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0056% |
79 | Upbit | MASK-BTC | $3.41 0.0009517 Eth | $8,447.92 2,474.945 MASK | 0.0053% |
80 | Mudrex | MASK-USDT | $3.50 0.0009771 Eth | $7,873.21 2,247.744 MASK | 0.0048% |
81 | Kanga | MASK-USDT | $3.49 0.0009743 Eth | $7,524.69 0.000 MASK | 0.0000% |
82 | CEX.IO | MASK-USDT | $3.49 0.0009738 Eth | $7,001.82 1,857.160 MASK | 0.0040% |
83 | Bit2Me | MASK-EUR | $3.51 0.0009809 Eth | $6,127.28 1,669.718 MASK | 0.0036% |
84 | Kraken | MASK-EUR | $3.51 0.0009805 Eth | $5,979.16 1,703.794 MASK | 0.0037% |
85 | OKCoin Japan | MASK-JPY | $3.48 0.0009716 Eth | $5,933.06 1,614.692 MASK | 0.0035% |
86 | Gemini | MASK-USD | $3.55 0.0009871 Eth | $5,571.74 1,568.621 MASK | 0.0034% |
87 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $3.49 0.0009747 Eth | $5,167.42 1,466.381 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0031% |
88 | Dex-Trade | MASK-BNB | $3.52 0.0009826 Eth | $3,365.11 956.200 MASK | 0.0020% |
89 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $3.51 0.0009804 Eth | $3,313.00 891.291 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0019% |
90 | Bittime | MASK-IDR | $3.49 0.0009757 Eth | $2,750.39 769.030 MASK | 0.0016% |
91 | Binance US | MASK-USDT | $3.54 0.0009877 Eth | $2,424.89 685.838 MASK | 0.0015% |
92 | Indodax | MASK-IDR | $3.52 0.0009796 Eth | $1,602.81 455.032 MASK | 0.0010% |
93 | Gate.io | MASK-TRY | $3.49 0.0009731 Eth | $1,157.77 331.501 MASK | 0.0007% |
94 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $3.49 0.0009745 Eth | $969.76 222.176 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0005% |
95 | CoinDCX | MASK-INR | $3.66 0.0010225 Eth | $830.90 0.000 MASK | 0.0000% |
96 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $3.44 0.0009598 Eth | $763.54 214.928 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0005% |
97 | Gate.io | MASK-ETH | $3.50 0.0009790 Eth | $320.47 88.296 MASK | 0.0002% |
98 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $3.57 0.0009965 Eth | $118.26 29.936 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
99 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $3.49 0.0009710 Eth | $112.27 31.572 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0001% |
100 | CEX.IO | MASK-USD | $3.51 0.0009794 Eth | $28.91 7.519 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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