Feature Tip: Add private address tag to any address under My Name Tag !
Overview
Max Total Supply
100,000,000 MASK
Holders
13,968 ( -0.014%)
Market
Price
$2.09 @ 0.000830 ETH (+2.31%)
Onchain Market Cap
$209,000,000.00
Circulating Supply Market Cap
$209,124,796.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
17.4311926605504 MASKValue
$36.43 ( ~0.0144742412968757 Eth) [0.0000%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | ![]() | MASK-USDT | $2.09 0.0008298 Eth | $16,584,945.00 8,041,564.200 MASK | 43.1601% |
2 | ![]() | MASK-USDT | $2.10 0.0008342 Eth | $3,352,387.00 1,597,031.000 MASK | 8.5715% |
3 | ![]() | MASK-USDT | $2.09 0.0008295 Eth | $2,248,824.00 1,093,451.731 MASK | 5.8687% |
4 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $1,535,500.00 745,999.082 MASK | 4.0039% |
5 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $1,445,973.00 702,572.700 MASK | 3.7708% |
6 | ![]() | MASK-USDT | $2.09 0.0008302 Eth | $1,312,044.00 628,004.700 MASK | 3.3706% |
7 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $1,156,363.00 561,793.400 MASK | 3.0152% |
8 | ![]() | MASK-USDT | $2.09 0.0008287 Eth | $1,127,932.00 547,771.371 MASK | 2.9400% |
9 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $964,870.00 468,525.800 MASK | 2.5146% |
10 | ![]() | MASK-USDT | $2.09 0.0008300 Eth | $953,221.00 455,839.700 MASK | 2.4466% |
11 | ![]() | MASK-USDT | $2.09 0.0008298 Eth | $948,030.00 458,614.330 MASK | 2.4614% |
12 | ![]() | MASK-USDT | $2.09 0.0008303 Eth | $898,960.00 430,263.046 MASK | 2.3093% |
13 | ![]() | MASK-VNST | $2.09 0.0008297 Eth | $880,485.00 421,206.500 MASK | 2.2607% |
14 | ![]() | MASK-USDT | $2.09 0.0008292 Eth | $489,440.00 237,528.390 MASK | 1.2748% |
15 | ![]() | MASK-KRW | $2.13 0.0008471 Eth | $369,828.00 173,496.695 MASK | 0.9312% |
16 | ![]() | MASK-USD | $2.09 0.0008304 Eth | $365,998.00 175,118.760 MASK | 0.9399% |
17 | ![]() | MASK-USDT | $2.09 0.0008302 Eth | $337,791.00 161,609.170 MASK | 0.8674% |
18 | ![]() | MASK-USDT | $2.09 0.0008297 Eth | $298,511.00 150,998.800 MASK | 0.8104% |
19 | ![]() | MASK-USDT | $2.09 0.0008297 Eth | $267,279.00 127,874.400 MASK | 0.6863% |
20 | ![]() | MASK-USDT | $2.09 0.0008285 Eth | $248,871.00 119,182.630 MASK | 0.6397% |
21 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $221,933.00 107,764.050 MASK | 0.5784% |
22 | ![]() | MASK-USDT | $2.09 0.0008308 Eth | $221,887.00 0.000 MASK | 0.0000% |
23 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $221,654.00 106,036.300 MASK | 0.5691% |
24 | ![]() | MASK-USDT | $2.09 0.0008302 Eth | $200,415.00 95,909.870 MASK | 0.5148% |
25 | ![]() | MASK-USDT | $2.09 0.0008293 Eth | $166,506.00 80,911.300 MASK | 0.4343% |
26 | ![]() | MASK-USDT | $2.11 0.0008385 Eth | $146,478.00 69,349.567 MASK | 0.3722% |
27 | ![]() | MASK-USDT | $2.09 0.0008296 Eth | $145,113.00 69,511.040 MASK | 0.3731% |
28 | ![]() | MASK-USDT | $2.09 0.0008310 Eth | $144,381.00 69,978.320 MASK | 0.3756% |
29 | ![]() | MASK-USDT | $2.10 0.0008330 Eth | $143,397.00 68,403.900 MASK | 0.3671% |
30 | ![]() | MASK-USDT | $2.09 0.0008297 Eth | $133,989.00 64,193.938 MASK | 0.3445% |
31 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $127,828.00 62,100.700 MASK | 0.3333% |
32 | ![]() | MASK-USDT | $2.09 0.0008306 Eth | $114,301.00 54,680.718 MASK | 0.2935% |
33 | ![]() | MASK-USDT | $2.09 0.0008287 Eth | $102,338.00 49,070.521 MASK | 0.2634% |
34 | ![]() | MASK-USDT | $2.09 0.0008301 Eth | $98,299.00 47,676.130 MASK | 0.2559% |
35 | ![]() | MASK-TRY | $2.10 0.0008342 Eth | $97,600.00 46,445.888 MASK | 0.2493% |
36 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $94,590.00 45,293.500 MASK | 0.2431% |
37 | ![]() | MASK-USDT | $2.09 0.0008300 Eth | $90,360.00 43,276.560 MASK | 0.2323% |
38 | ![]() | MASK-USDT | $2.09 0.0008295 Eth | $88,772.00 43,130.300 MASK | 0.2315% |
39 | ![]() | MASK-USDT | $2.09 0.0008303 Eth | $81,759.00 39,115.649 MASK | 0.2099% |
40 | ![]() | MASK-USDT | $2.09 0.0008289 Eth | $74,060.00 35,499.006 MASK | 0.1905% |
41 | ![]() | MASK-USDT | $2.09 0.0008302 Eth | $72,484.00 34,678.433 MASK | 0.1861% |
42 | ![]() | MASK-USDT | $2.09 0.0008307 Eth | $69,985.00 33,978.279 MASK | 0.1824% |
43 | ![]() | MASK-USDT | $2.09 0.0008306 Eth | $66,351.00 32,302.420 MASK | 0.1734% |
44 | ![]() | MASK-USDT | $2.09 0.0008288 Eth | $63,768.00 30,538.400 MASK | 0.1639% |
45 | ![]() | MASK-USDT | $2.09 0.0008295 Eth | $48,361.00 23,169.067 MASK | 0.1244% |
46 | ![]() | MASK-KRW | $2.13 0.0008452 Eth | $45,363.00 21,326.751 MASK | 0.1145% |
47 | ![]() | MASK-USDT | $2.09 0.0008299 Eth | $41,893.00 20,361.200 MASK | 0.1093% |
48 | ![]() | MASK-TRY | $2.10 0.0008352 Eth | $41,654.00 19,816.210 MASK | 0.1064% |
49 | ![]() | MASK-USDT | $2.09 0.0008296 Eth | $32,685.00 15,879.901 MASK | 0.0852% |
50 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.09 0.0008306 Eth | $30,469.00 14,838.750 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0796% |
51 | ![]() | MASK-EUR | $2.09 0.0008317 Eth | $29,466.00 14,078.675 MASK | 0.0756% |
52 | ![]() | MASK-USDT | $2.10 0.0008323 Eth | $25,304.00 12,214.995 MASK | 0.0656% |
53 | ![]() | MASK-USDT | $2.09 0.0008301 Eth | $23,113.00 11,052.485 MASK | 0.0593% |
54 | ![]() | MASK-BNB | $2.10 0.0008357 Eth | $22,205.00 10,769.900 MASK | 0.0578% |
55 | ![]() | MASK-BNB | $2.09 0.0008313 Eth | $21,215.00 10,144.800 MASK | 0.0544% |
56 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.09 0.0008283 Eth | $18,042.05 8,779.808 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0471% |
57 | ![]() | MASK-USDT | $2.09 0.0008302 Eth | $16,633.35 7,961.300 MASK | 0.0427% |
58 | ![]() | MASK-EUR | $2.09 0.0008322 Eth | $16,366.41 7,814.330 MASK | 0.0419% |
59 | ![]() | MASK-USD | $2.10 0.0008353 Eth | $15,886.23 7,557.676 MASK | 0.0406% |
60 | ![]() | MASK-TRY | $2.10 0.0008356 Eth | $13,340.57 6,431.134 MASK | 0.0345% |
61 | ![]() | MASK-USDT | $2.09 0.0008286 Eth | $12,208.80 5,854.670 MASK | 0.0314% |
62 | ![]() | MASK-TRY | $2.09 0.0008317 Eth | $11,994.65 5,786.810 MASK | 0.0311% |
63 | ![]() | MASK-TRY | $2.10 0.0008355 Eth | $10,861.18 5,266.100 MASK | 0.0283% |
64 | ![]() | MASK-USDT | $2.09 0.0008303 Eth | $10,167.92 4,869.021 MASK | 0.0261% |
65 | ![]() | MASK-USDT | $2.09 0.0008305 Eth | $10,146.87 4,854.240 MASK | 0.0261% |
66 | ![]() | MASK-USDT | $2.10 0.0008338 Eth | $9,662.65 4,603.100 MASK | 0.0247% |
67 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $8,237.18 3,940.565 MASK | 0.0211% |
68 | ![]() | MASK-USDT | $2.09 0.0008290 Eth | $6,488.99 0.000 MASK | 0.0000% |
69 | ![]() | MASK-USDT | $2.09 0.0008296 Eth | $5,573.28 2,669.700 MASK | 0.0143% |
70 | ![]() | MASK-JPY | $2.10 0.0008325 Eth | $5,191.13 2,475.000 MASK | 0.0133% |
71 | ![]() | MASK-TRY | $2.09 0.0008320 Eth | $4,858.08 2,319.160 MASK | 0.0124% |
72 | ![]() | MASK-USDT | $2.09 0.0008298 Eth | $4,348.72 2,079.379 MASK | 0.0112% |
73 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $4,200.12 2,036.600 MASK | 0.0109% |
74 | ![]() | MASK-USDT | $2.08 0.0008254 Eth | $3,366.65 1,618.800 MASK | 0.0087% |
75 | ![]() | MASK-USDC | $2.09 0.0008307 Eth | $3,193.60 1,572.370 MASK | 0.0084% |
76 | ![]() | MASK-USD | $2.09 0.0008296 Eth | $3,106.98 1,488.300 MASK | 0.0080% |
77 | ![]() | MASK-JPY | $2.11 0.0008373 Eth | $1,788.83 849.261 MASK | 0.0046% |
78 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.10 0.0008334 Eth | $1,300.21 639.010 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0034% |
79 | ![]() | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.09 0.0008289 Eth | $1,169.83 570.723 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0031% |
80 | ![]() | MASK-USD | $2.08 0.0008273 Eth | $991.57 476.257 MASK | 0.0026% |
81 | ![]() | MASK-USDT | $2.09 0.0008295 Eth | $943.89 452.192 MASK | 0.0024% |
82 | ![]() | MASK-EUR | $2.10 0.0008331 Eth | $934.53 445.732 MASK | 0.0024% |
83 | ![]() | MASK-EUR | $2.10 0.0008321 Eth | $915.68 436.817 MASK | 0.0023% |
84 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.08 0.0008285 Eth | $299.14 146.228 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0008% |
85 | ![]() | MASK-USDT | $2.07 0.0008242 Eth | $137.14 66.124 MASK | 0.0004% |
86 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.05 0.0008138 Eth | $63.38 31.057 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0002% |
87 | ![]() | MASK-IDR | $2.10 0.0008323 Eth | $47.97 23.000 MASK | 0.0001% |
88 | ![]() | MASK-USDT | $2.09 0.0008297 Eth | $46.02 22.036 MASK | 0.0001% |
89 | ![]() | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $2.06 0.0008180 Eth | $33.05 16.051 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0001% |
90 | ![]() | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.05 0.0008148 Eth | $32.32 17.372 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
91 | ![]() | MASK-BNB | $2.10 0.0008357 Eth | $31.05 14.759 MASK | 0.0001% |
92 | ![]() | MASK-TRY | $2.05 0.0008170 Eth | $29.62 14.417 MASK | 0.0001% |
93 | ![]() | MASK-TRY | $2.11 0.0008368 Eth | $26.78 12.935 MASK | 0.0001% |
94 | ![]() | MASK-USDT | $2.09 0.0008304 Eth | $22.57 11.003 MASK | 0.0001% |
95 | ![]() | MASK-ETH | $2.07 0.0008216 Eth | $20.74 10.217 MASK | 0.0001% |
96 | ![]() | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.07 0.0008240 Eth | $19.58 9.639 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0001% |
97 | ![]() | MASK-USD | $2.09 0.0008308 Eth | $16.37 8.069 MASK | 0.0000% |
98 | ![]() | MASK-INR | $2.26 0.0008992 Eth | $12.99 0.000 MASK | 0.0000% |
99 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.10 0.0008334 Eth | $12.70 6.083 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0000% |
100 | ![]() | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.07 0.0008226 Eth | $12.26 5.968 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 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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