Overview
Max Total Supply
100,000,000 MASK
Holders
13,934 ( 0.029%)
Market
Price
$2.25 @ 0.000860 ETH (+1.03%)
Onchain Market Cap
$225,000,000.00
Circulating Supply Market Cap
$225,507,023.00
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 | ![]() | MASK-USDT | $2.24 0.0008572 Eth | $8,375,680.00 3,736,668.100 MASK | 19.5950% |
2 | ![]() | MASK-USDT | $2.26 0.0008627 Eth | $6,972,749.00 3,089,641.000 MASK | 16.2020% |
3 | ![]() | MASK-USDT | $2.24 0.0008570 Eth | $5,922,731.00 2,652,152.200 MASK | 13.9078% |
4 | ![]() | MASK-USDT | $2.25 0.0008591 Eth | $3,452,764.00 1,536,963.280 MASK | 8.0598% |
5 | ![]() | MASK-USDT | $2.24 0.0008576 Eth | $3,161,671.00 1,413,453.600 MASK | 7.4121% |
6 | ![]() | MASK-USDT | $2.25 0.0008584 Eth | $2,324,528.00 1,040,330.363 MASK | 5.4555% |
7 | ![]() | MASK-USDT | $2.24 0.0008579 Eth | $1,714,021.00 763,595.670 MASK | 4.0043% |
8 | ![]() | MASK-USDT | $2.25 0.0008587 Eth | $1,401,158.00 628,053.770 MASK | 3.2935% |
9 | ![]() | MASK-USDT | $2.24 0.0008562 Eth | $1,199,822.00 537,766.000 MASK | 2.8200% |
10 | ![]() | MASK-USDT | $2.25 0.0008591 Eth | $1,141,290.00 0.000 MASK | 0.0000% |
11 | ![]() | MASK-USDT | $2.25 0.0008587 Eth | $899,158.00 402,229.247 MASK | 2.1093% |
12 | ![]() | MASK-KRW | $2.36 0.0009011 Eth | $858,247.00 363,844.434 MASK | 1.9080% |
13 | ![]() | MASK-USDT | $2.24 0.0008567 Eth | $777,630.00 348,312.460 MASK | 1.8265% |
14 | ![]() | MASK-USDT | $2.24 0.0008570 Eth | $735,877.00 328,332.100 MASK | 1.7218% |
15 | ![]() | MASK-USDT | $2.25 0.0008585 Eth | $687,747.00 306,217.600 MASK | 1.6058% |
16 | ![]() | MASK-USDT | $2.25 0.0008599 Eth | $625,286.00 279,758.225 MASK | 1.4670% |
17 | ![]() | MASK-USDT | $2.25 0.0008581 Eth | $301,505.00 139,608.005 MASK | 0.7321% |
18 | ![]() | MASK-USDT | $2.25 0.0008587 Eth | $251,456.00 112,442.845 MASK | 0.5896% |
19 | ![]() | MASK-USDT | $2.26 0.0008564 Eth | $243,252.00 108,810.300 MASK | 0.5706% |
20 | ![]() | MASK-USDT | $2.24 0.0008574 Eth | $225,401.00 100,420.100 MASK | 0.5266% |
21 | ![]() | MASK-USDT | $2.24 0.0008565 Eth | $216,755.00 96,901.670 MASK | 0.5082% |
22 | ![]() | MASK-USDT | $2.24 0.0008573 Eth | $200,291.00 89,511.800 MASK | 0.4694% |
23 | ![]() | MASK-USDT | $2.24 0.0008545 Eth | $188,631.00 84,263.800 MASK | 0.4419% |
24 | ![]() | MASK-USDT | $2.25 0.0008586 Eth | $170,719.00 75,962.744 MASK | 0.3983% |
25 | ![]() | MASK-TRY | $2.25 0.0008615 Eth | $170,081.00 75,758.000 MASK | 0.3973% |
26 | ![]() | MASK-USDT | $2.25 0.0008592 Eth | $164,901.00 73,321.927 MASK | 0.3845% |
27 | ![]() | MASK-USDT | $2.24 0.0008571 Eth | $158,919.00 71,166.700 MASK | 0.3732% |
28 | ![]() | MASK-USDT | $2.23 0.0008526 Eth | $153,798.00 68,983.790 MASK | 0.3618% |
29 | ![]() | MASK-USDT | $2.25 0.0008602 Eth | $139,959.00 62,159.700 MASK | 0.3260% |
30 | ![]() | MASK-KRW | $2.36 0.0008992 Eth | $139,731.00 59,324.005 MASK | 0.3111% |
31 | ![]() | MASK-USDT | $2.24 0.0008564 Eth | $132,123.00 58,895.332 MASK | 0.3088% |
32 | ![]() | MASK-TRY | $2.26 0.0008621 Eth | $129,203.00 57,214.580 MASK | 0.3000% |
33 | ![]() | MASK-USDT | $2.25 0.0008583 Eth | $110,339.00 49,345.100 MASK | 0.2588% |
34 | ![]() | MASK-USDT | $2.24 0.0008570 Eth | $101,831.00 45,407.737 MASK | 0.2381% |
35 | ![]() | MASK-USDT | $2.25 0.0008579 Eth | $98,990.00 44,314.500 MASK | 0.2324% |
36 | ![]() | MASK-USDT | $2.25 0.0008603 Eth | $96,716.00 42,993.020 MASK | 0.2255% |
37 | ![]() | MASK-USDT | $2.25 0.0008597 Eth | $93,320.00 41,465.500 MASK | 0.2174% |
38 | ![]() | MASK-USDT | $2.25 0.0008599 Eth | $80,761.00 36,128.443 MASK | 0.1895% |
39 | ![]() | MASK-TRY | $2.25 0.0008599 Eth | $79,528.00 35,317.800 MASK | 0.1852% |
40 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.26 0.0008632 Eth | $76,200.00 33,708.806 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1768% |
41 | ![]() | MASK-USDT | $2.25 0.0008584 Eth | $72,621.00 32,320.700 MASK | 0.1695% |
42 | ![]() | MASK-USDT | $2.25 0.0008590 Eth | $72,350.00 32,385.737 MASK | 0.1698% |
43 | ![]() | MASK-USDT | $2.25 0.0008589 Eth | $66,668.00 29,814.500 MASK | 0.1563% |
44 | ![]() | MASK-USD | $2.25 0.0008590 Eth | $65,976.00 29,322.520 MASK | 0.1538% |
45 | ![]() | MASK-USDT | $2.25 0.0008591 Eth | $64,926.00 29,188.808 MASK | 0.1531% |
46 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.24 0.0008569 Eth | $63,326.00 28,418.117 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1490% |
47 | ![]() | MASK-EUR | $2.26 0.0008632 Eth | $58,114.00 25,717.251 MASK | 0.1349% |
48 | ![]() | MASK-USDT | $2.25 0.0008593 Eth | $48,129.00 21,513.327 MASK | 0.1128% |
49 | ![]() | MASK-USDT | $2.25 0.0008585 Eth | $46,026.00 20,605.400 MASK | 0.1081% |
50 | ![]() | MASK-USDT | $2.26 0.0008615 Eth | $44,431.00 19,703.390 MASK | 0.1033% |
51 | ![]() | MASK-USDT | $2.25 0.0008595 Eth | $43,031.00 19,244.600 MASK | 0.1009% |
52 | ![]() | MASK-USDT | $2.24 0.0008570 Eth | $32,446.00 14,478.804 MASK | 0.0759% |
53 | ![]() | MASK-USDT | $2.25 0.0008593 Eth | $29,237.00 12,997.463 MASK | 0.0682% |
54 | ![]() | MASK-USDT | $2.24 0.0008539 Eth | $25,757.00 11,521.411 MASK | 0.0604% |
55 | ![]() | MASK-USDT | $2.24 0.0008568 Eth | $21,120.00 9,456.066 MASK | 0.0496% |
56 | ![]() | MASK-BNB | $2.24 0.0008556 Eth | $20,686.00 9,389.700 MASK | 0.0492% |
57 | ![]() | MASK-USDT | $2.24 0.0008578 Eth | $17,548.12 7,821.500 MASK | 0.0410% |
58 | ![]() | MASK-TRY | $2.24 0.0008575 Eth | $13,916.00 6,197.810 MASK | 0.0325% |
59 | ![]() | MASK-USDT | $2.24 0.0008564 Eth | $12,921.62 5,764.445 MASK | 0.0302% |
60 | ![]() | MASK-USD | $2.26 0.0008615 Eth | $8,458.47 3,750.986 MASK | 0.0197% |
61 | ![]() | MASK-USD | $2.25 0.0008606 Eth | $7,375.84 3,271.900 MASK | 0.0172% |
62 | ![]() | MASK-USDT | $2.25 0.0008593 Eth | $7,129.90 0.000 MASK | 0.0000% |
63 | ![]() | MASK-USDT | $2.25 0.0008596 Eth | $7,107.90 3,156.700 MASK | 0.0166% |
64 | ![]() | MASK-USDT | $2.25 0.0008589 Eth | $6,990.23 3,125.500 MASK | 0.0164% |
65 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.26 0.0008634 Eth | $6,863.79 3,030.991 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0159% |
66 | ![]() | MASK-USDT | $2.24 0.0008497 Eth | $6,819.88 3,037.900 MASK | 0.0159% |
67 | ![]() | MASK-EUR | $2.23 0.0008499 Eth | $5,597.20 2,514.310 MASK | 0.0132% |
68 | ![]() | MASK-JPY | $2.25 0.0008587 Eth | $5,213.92 2,318.205 MASK | 0.0122% |
69 | ![]() | MASK-TRY | $2.26 0.0008592 Eth | $4,624.05 2,045.610 MASK | 0.0107% |
70 | ![]() | MASK-VNST | $2.24 0.0008573 Eth | $2,228.65 994.135 MASK | 0.0052% |
71 | ![]() | MASK-USDT | $2.25 0.0008585 Eth | $2,209.54 983.328 MASK | 0.0052% |
72 | ![]() | MASK-USDT | $2.24 0.0008570 Eth | $2,158.29 962.413 MASK | 0.0050% |
73 | ![]() | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.26 0.0008640 Eth | $1,966.03 881.091 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0046% |
74 | ![]() | MASK-USDT | $2.25 0.0008510 Eth | $1,868.07 831.800 MASK | 0.0044% |
75 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.23 0.0008517 Eth | $1,652.36 742.830 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0039% |
76 | ![]() | MASK-TRY | $2.27 0.0008656 Eth | $1,553.71 692.890 MASK | 0.0036% |
77 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.30 0.0008779 Eth | $1,489.48 655.408 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0034% |
78 | ![]() | MASK-USDT | $2.25 0.0008594 Eth | $1,131.22 502.801 MASK | 0.0026% |
79 | ![]() | MASK-USDT | $2.25 0.0008596 Eth | $949.16 421.850 MASK | 0.0022% |
80 | ![]() | MASK-USDT | $2.25 0.0008579 Eth | $922.39 412.160 MASK | 0.0022% |
81 | ![]() | MASK-USDT | $2.19 0.0008360 Eth | $866.56 395.956 MASK | 0.0021% |
82 | ![]() | MASK-BNB | $2.24 0.0008569 Eth | $701.01 312.500 MASK | 0.0016% |
83 | ![]() | MASK-EUR | $2.23 0.0008501 Eth | $590.96 265.588 MASK | 0.0014% |
84 | ![]() | MASK-EUR | $2.23 0.0008462 Eth | $579.96 260.277 MASK | 0.0014% |
85 | ![]() | MASK-BTC | $2.24 0.0008547 Eth | $512.96 228.596 MASK | 0.0012% |
86 | ![]() | MASK-USD | $2.22 0.0008493 Eth | $512.38 230.492 MASK | 0.0012% |
87 | ![]() | MASK-INR | $2.36 0.0009025 Eth | $506.63 0.000 MASK | 0.0000% |
88 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.24 0.0008551 Eth | $482.10 215.738 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0011% |
89 | ![]() | MASK-GBP | $2.22 0.0008480 Eth | $450.10 202.630 MASK | 0.0011% |
90 | ![]() | MASK-USDC | $2.25 0.0008601 Eth | $416.22 185.272 MASK | 0.0010% |
91 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.23 0.0008524 Eth | $312.56 138.548 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0007% |
92 | ![]() | MASK-BTC | $2.24 0.0008559 Eth | $252.47 112.692 MASK | 0.0006% |
93 | ![]() | MASK-IDR | $2.26 0.0008620 Eth | $198.62 88.630 MASK | 0.0005% |
94 | ![]() | MASK-BRL | $2.22 0.0008484 Eth | $79.90 35.978 MASK | 0.0002% |
95 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.24 0.0008573 Eth | $79.43 35.535 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0002% |
96 | ![]() | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.38 0.0008485 Eth | $36.51 14.336 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0001% |
97 | ![]() | MASK-USDT | $2.24 0.0008566 Eth | $30.37 13.838 MASK | 0.0001% |
98 | ![]() | MASK-BTC | $2.18 0.0008347 Eth | $25.90 10.573 MASK | 0.0001% |
99 | ![]() | MASK-USD | $2.24 0.0008565 Eth | $24.57 10.925 MASK | 0.0001% |
100 | ![]() | MASK-IDR | $2.20 0.0008415 Eth | $18.04 8.195 MASK | 0.0000% |
Contract Source Code Verified (Exact Match)
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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