Overview
Max Total Supply
100,000,000 MASK
Holders
13,866 (0.00%)
Market
Price
$2.20 @ 0.001026 ETH (+0.84%)
Onchain Market Cap
$220,000,000.00
Circulating Supply Market Cap
$220,439,641.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
8.035689587682539829 MASKValue
$17.68 ( ~0.00824199842376822 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | ![]() | MASK-USDT | $2.20 0.0010243 Eth | $7,657,651.00 3,473,589.230 MASK | 16.3052% |
2 | ![]() | MASK-USDT | $2.22 0.0010297 Eth | $7,088,606.00 3,197,149.000 MASK | 15.0076% |
3 | ![]() | MASK-USDT | $2.21 0.0010264 Eth | $6,192,849.00 2,825,208.200 MASK | 13.2617% |
4 | ![]() | MASK-USDT | $2.21 0.0010203 Eth | $4,445,905.00 2,028,473.100 MASK | 9.5218% |
5 | ![]() | MASK-KRW | $2.28 0.0010598 Eth | $3,269,350.00 1,433,306.420 MASK | 6.7280% |
6 | ![]() | MASK-USDT | $2.21 0.0010265 Eth | $2,577,979.00 1,172,797.096 MASK | 5.5052% |
7 | ![]() | MASK-USDT | $2.21 0.0010267 Eth | $2,454,655.00 1,112,534.840 MASK | 5.2223% |
8 | ![]() | MASK-USDT | $2.20 0.0010249 Eth | $2,109,627.00 956,956.700 MASK | 4.4920% |
9 | ![]() | MASK-USDT | $2.20 0.0010249 Eth | $1,724,994.00 786,439.121 MASK | 3.6916% |
10 | ![]() | MASK-USDT | $2.20 0.0010249 Eth | $1,506,462.00 0.000 MASK | 0.0000% |
11 | ![]() | MASK-USDT | $2.21 0.0010250 Eth | $1,293,030.00 588,616.770 MASK | 2.7630% |
12 | ![]() | MASK-USDT | $2.21 0.0010186 Eth | $976,467.00 442,215.600 MASK | 2.0758% |
13 | ![]() | MASK-USDT | $2.21 0.0010267 Eth | $943,523.00 430,230.720 MASK | 2.0195% |
14 | ![]() | MASK-USDT | $2.21 0.0010232 Eth | $911,170.00 414,898.800 MASK | 1.9476% |
15 | ![]() | MASK-USDT | $2.21 0.0010207 Eth | $684,491.00 309,556.825 MASK | 1.4531% |
16 | ![]() | MASK-USDT | $2.20 0.0010248 Eth | $662,430.00 302,612.214 MASK | 1.4205% |
17 | ![]() | MASK-USDT | $2.21 0.0010218 Eth | $553,165.00 252,307.150 MASK | 1.1843% |
18 | ![]() | MASK-USDT | $2.21 0.0010253 Eth | $436,746.00 197,915.320 MASK | 0.9290% |
19 | ![]() | MASK-USDT | $2.21 0.0010248 Eth | $388,092.00 176,919.628 MASK | 0.8305% |
20 | ![]() | MASK-USDT | $2.21 0.0010267 Eth | $379,178.00 172,871.500 MASK | 0.8115% |
21 | ![]() | MASK-USDT | $2.21 0.0010254 Eth | $354,051.00 161,432.585 MASK | 0.7578% |
22 | ![]() | MASK-USDT | $2.21 0.0010212 Eth | $350,601.00 158,722.741 MASK | 0.7451% |
23 | ![]() | MASK-USDT | $2.21 0.0010248 Eth | $339,845.00 158,946.006 MASK | 0.7461% |
24 | ![]() | MASK-USDT | $2.21 0.0010258 Eth | $275,993.00 125,081.067 MASK | 0.5871% |
25 | ![]() | MASK-USDT | $2.21 0.0010205 Eth | $268,822.00 122,577.720 MASK | 0.5754% |
26 | ![]() | MASK-TRY | $2.21 0.0010284 Eth | $246,059.00 111,345.400 MASK | 0.5227% |
27 | ![]() | MASK-KRW | $2.27 0.0010555 Eth | $241,043.00 106,058.900 MASK | 0.4978% |
28 | ![]() | MASK-USDT | $2.21 0.0010245 Eth | $227,053.00 102,966.300 MASK | 0.4833% |
29 | ![]() | MASK-USDT | $2.21 0.0010223 Eth | $211,291.00 96,322.500 MASK | 0.4521% |
30 | ![]() | MASK-USDT | $2.20 0.0010230 Eth | $198,093.00 89,967.609 MASK | 0.4223% |
31 | ![]() | MASK-USDT | $2.21 0.0010255 Eth | $196,612.00 89,072.976 MASK | 0.4181% |
32 | ![]() | MASK-USDT | $2.21 0.0010265 Eth | $176,883.00 80,109.676 MASK | 0.3760% |
33 | ![]() | MASK-USD | $2.21 0.0010268 Eth | $175,118.00 79,239.030 MASK | 0.3720% |
34 | ![]() | MASK-USDT | $2.20 0.0010217 Eth | $169,121.00 77,354.200 MASK | 0.3631% |
35 | ![]() | MASK-TRY | $2.21 0.0010212 Eth | $156,017.00 70,920.500 MASK | 0.3329% |
36 | ![]() | MASK-USDT | $2.19 0.0010197 Eth | $154,074.00 70,208.034 MASK | 0.3296% |
37 | ![]() | MASK-USDT | $2.19 0.0010161 Eth | $153,850.00 70,303.463 MASK | 0.3300% |
38 | ![]() | MASK-USDT | $2.21 0.0010268 Eth | $149,608.00 67,741.600 MASK | 0.3180% |
39 | ![]() | MASK-USDT | $2.20 0.0010161 Eth | $143,043.00 64,944.110 MASK | 0.3049% |
40 | ![]() | MASK-USDT | $2.20 0.0010220 Eth | $137,335.00 62,405.100 MASK | 0.2929% |
41 | ![]() | MASK-USDT | $2.21 0.0010117 Eth | $128,209.00 58,010.371 MASK | 0.2723% |
42 | ![]() | MASK-USDT | $2.21 0.0010200 Eth | $125,923.00 56,975.200 MASK | 0.2674% |
43 | ![]() | MASK-USDT | $2.21 0.0010234 Eth | $116,434.00 53,082.700 MASK | 0.2492% |
44 | ![]() | MASK-TRY | $2.21 0.0010268 Eth | $96,561.00 43,776.100 MASK | 0.2055% |
45 | ![]() | MASK-TRY | $2.19 0.0010091 Eth | $89,487.00 40,870.120 MASK | 0.1918% |
46 | ![]() | MASK-USDT | $2.21 0.0010240 Eth | $89,463.00 40,567.029 MASK | 0.1904% |
47 | ![]() | MASK-USDT | $2.21 0.0010250 Eth | $85,733.00 39,071.526 MASK | 0.1834% |
48 | ![]() | MASK-BNB | $2.20 0.0010216 Eth | $60,106.00 26,838.500 MASK | 0.1260% |
49 | ![]() | MASK-USDT | $2.21 0.0010245 Eth | $58,386.00 26,627.612 MASK | 0.1250% |
50 | ![]() | MASK-USDT | $2.21 0.0010212 Eth | $45,508.00 20,750.200 MASK | 0.0974% |
51 | ![]() | MASK-USDT | $2.20 0.0010231 Eth | $45,482.00 20,733.800 MASK | 0.0973% |
52 | ![]() | MASK-USDT | $2.21 0.0010259 Eth | $42,592.00 19,332.200 MASK | 0.0907% |
53 | ![]() | MASK-USDT | $2.21 0.0010254 Eth | $38,618.00 17,509.574 MASK | 0.0822% |
54 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.20 0.0010221 Eth | $36,886.00 16,860.510 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0791% |
55 | ![]() | MASK-ETH | $2.09 0.0009749 Eth | $36,460.00 17,413.000 MASK | 0.0817% |
56 | ![]() | MASK-EUR | $2.21 0.0010191 Eth | $32,893.00 14,888.814 MASK | 0.0699% |
57 | ![]() | MASK-USDT | $2.21 0.0010264 Eth | $32,739.00 14,955.782 MASK | 0.0702% |
58 | ![]() | MASK-IDR | $2.22 0.0010324 Eth | $30,230.00 13,665.190 MASK | 0.0641% |
59 | ![]() | MASK-USDT | $2.20 0.0010267 Eth | $19,843.58 9,046.031 MASK | 0.0425% |
60 | ![]() | MASK-USDT | $2.22 0.0010320 Eth | $19,066.19 8,583.300 MASK | 0.0403% |
61 | ![]() | MASK-USDT | $2.21 0.0010230 Eth | $17,625.68 7,982.633 MASK | 0.0375% |
62 | ![]() | MASK-USDT | $2.20 0.0010231 Eth | $17,395.22 7,895.000 MASK | 0.0371% |
63 | ![]() | MASK-USDT | $2.21 0.0010254 Eth | $15,238.21 6,909.133 MASK | 0.0324% |
64 | ![]() | MASK-TRY | $2.24 0.0010406 Eth | $13,094.10 5,946.900 MASK | 0.0279% |
65 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.18 0.0010117 Eth | $12,780.66 5,672.922 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0266% |
66 | ![]() | MASK-JPY | $2.21 0.0010300 Eth | $11,603.49 5,245.022 MASK | 0.0246% |
67 | ![]() | MASK-USDT | $2.20 0.0010246 Eth | $10,668.10 4,876.400 MASK | 0.0229% |
68 | ![]() | MASK-USD | $2.21 0.0010263 Eth | $9,254.61 4,189.500 MASK | 0.0197% |
69 | ![]() | MASK-USDT | $2.21 0.0010254 Eth | $8,886.66 0.000 MASK | 0.0000% |
70 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.21 0.0010261 Eth | $8,882.81 4,033.318 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0189% |
71 | ![]() | MASK-USD | $2.22 0.0010340 Eth | $6,255.10 2,812.545 MASK | 0.0132% |
72 | ![]() | MASK-USDT | $2.19 0.0010122 Eth | $5,128.31 2,337.100 MASK | 0.0110% |
73 | ![]() | MASK-EUR | $2.23 0.0010353 Eth | $3,674.33 1,648.870 MASK | 0.0077% |
74 | ![]() | MASK-EUR | $2.22 0.0010311 Eth | $3,210.92 1,447.809 MASK | 0.0068% |
75 | ![]() | MASK-EUR | $2.22 0.0010325 Eth | $3,142.07 1,418.852 MASK | 0.0067% |
76 | ![]() | MASK-VNST | $2.21 0.0010269 Eth | $2,995.85 1,355.469 MASK | 0.0064% |
77 | ![]() | MASK-USDT | $2.21 0.0010210 Eth | $2,955.01 1,335.501 MASK | 0.0063% |
78 | ![]() | MASK-USDT | $2.23 0.0010322 Eth | $2,605.42 1,170.422 MASK | 0.0055% |
79 | ![]() | MASK-USDT | $2.20 0.0010191 Eth | $2,338.38 1,060.700 MASK | 0.0050% |
80 | ![]() | MASK-USDC | $2.20 0.0010251 Eth | $2,281.96 1,043.959 MASK | 0.0049% |
81 | ![]() | MASK-USDT | $2.21 0.0010264 Eth | $1,667.99 755.050 MASK | 0.0035% |
82 | ![]() | MASK-BNB | $2.20 0.0010211 Eth | $1,664.61 755.300 MASK | 0.0035% |
83 | ![]() | MASK-GBP | $2.21 0.0010261 Eth | $1,352.94 612.570 MASK | 0.0029% |
84 | ![]() | MASK-TRY | $2.22 0.0010299 Eth | $1,143.64 519.902 MASK | 0.0024% |
85 | ![]() | MASK-USDT | $2.21 0.0010205 Eth | $922.70 420.500 MASK | 0.0020% |
86 | ![]() | MASK-KRW | $2.30 0.0010677 Eth | $795.56 346.170 MASK | 0.0016% |
87 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.25 0.0010468 Eth | $613.19 275.626 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0013% |
88 | ![]() | MASK-INR | $2.39 0.0011087 Eth | $463.45 0.000 MASK | 0.0000% |
89 | ![]() | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.21 0.0010278 Eth | $409.40 187.000 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0009% |
90 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.21 0.0010276 Eth | $299.42 135.605 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0006% |
91 | ![]() | MASK-USD | $2.19 0.0010175 Eth | $226.44 103.396 MASK | 0.0005% |
92 | ![]() | MASK-USDT | $2.21 0.0010208 Eth | $222.50 100.529 MASK | 0.0005% |
93 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.24 0.0010347 Eth | $129.82 58.112 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0003% |
94 | ![]() | MASK-BTC | $2.19 0.0010176 Eth | $116.11 56.794 MASK | 0.0003% |
95 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.25 0.0010444 Eth | $56.27 25.831 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
96 | ![]() | MASK-JPY | $2.22 0.0010272 Eth | $53.78 24.657 MASK | 0.0001% |
97 | ![]() | MASK-USDT | $2.21 0.0010247 Eth | $31.86 14.566 MASK | 0.0001% |
98 | ![]() | MASK-USD | $2.21 0.0010240 Eth | $28.68 13.109 MASK | 0.0001% |
99 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.20 0.0010213 Eth | $15.70 7.144 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0000% |
100 | ![]() | MASK-IDR | $2.21 0.0010283 Eth | $8.45 3.828 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
Contract ABI
API[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Swarm Source
ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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