Overview
Max Total Supply
100,000,000 MASK
Holders
13,960 ( -0.007%)
Market
Price
$2.04 @ 0.000822 ETH (-6.23%)
Onchain Market Cap
$204,000,000.00
Circulating Supply Market Cap
$203,166,303.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
120.1 MASKValue
$245.00 ( ~0.0987729686329598 Eth) [0.0001%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | BTCC | MASK-USDT | $2.04 0.0008208 Eth | $18,785,248.00 9,067,037.400 MASK | 37.5532% |
2 | Bibox | MASK-USDT | $2.05 0.0008250 Eth | $3,586,514.00 1,752,222.000 MASK | 7.2572% |
3 | Binance | MASK-USDT | $2.03 0.0008206 Eth | $2,856,781.00 1,384,618.400 MASK | 5.7347% |
4 | HTX | MASK-USDT | $2.04 0.0008201 Eth | $2,734,257.00 1,323,862.002 MASK | 5.4831% |
5 | Biconomy.com | MASK-USDT | $2.04 0.0008206 Eth | $2,633,896.00 1,273,423.312 MASK | 5.2742% |
6 | Bitrue | MASK-USDT | $2.04 0.0008211 Eth | $2,547,343.00 1,250,383.300 MASK | 5.1787% |
7 | OKX | MASK-USDT | $2.04 0.0008211 Eth | $1,465,238.00 711,576.733 MASK | 2.9472% |
8 | Bitget | MASK-USDT | $2.04 0.0008210 Eth | $1,405,613.00 677,765.583 MASK | 2.8071% |
9 | Nami.Exchange | MASK-VNST | $2.05 0.0008253 Eth | $1,378,908.00 674,034.300 MASK | 2.7917% |
10 | Nami.Exchange | MASK-USDT | $2.04 0.0008212 Eth | $1,353,092.00 664,703.800 MASK | 2.7530% |
11 | WhiteBIT | MASK-USDT | $2.03 0.0008208 Eth | $1,248,765.00 613,754.859 MASK | 2.5420% |
12 | BloFin | MASK-USDT | $2.03 0.0008207 Eth | $1,224,557.00 593,226.000 MASK | 2.4570% |
13 | Trubit | MASK-USDT | $2.04 0.0008209 Eth | $1,174,373.00 566,915.000 MASK | 2.3480% |
14 | Upbit | MASK-KRW | $2.08 0.0008362 Eth | $1,093,309.00 526,876.297 MASK | 2.1822% |
15 | Bybit | MASK-USDT | $2.04 0.0008208 Eth | $689,934.00 334,772.740 MASK | 1.3865% |
16 | BYDFi | MASK-USDT | $2.04 0.0008209 Eth | $489,036.00 240,046.200 MASK | 0.9942% |
17 | Coinbase Exchange | MASK-USD | $2.03 0.0008180 Eth | $477,430.00 235,187.110 MASK | 0.9741% |
18 | Websea | MASK-USDT | $2.04 0.0008209 Eth | $441,471.00 0.000 MASK | 0.0000% |
19 | Bitunix | MASK-USDT | $2.03 0.0008195 Eth | $437,454.00 215,776.740 MASK | 0.8937% |
20 | LBank | MASK-USDT | $2.04 0.0008204 Eth | $390,518.00 191,795.230 MASK | 0.7944% |
21 | Deepcoin | MASK-USDT | $2.04 0.0008208 Eth | $381,574.00 188,335.400 MASK | 0.7800% |
22 | Toobit | MASK-USDT | $2.04 0.0008213 Eth | $345,238.00 167,168.470 MASK | 0.6924% |
23 | Hotcoin | MASK-USDT | $2.04 0.0008209 Eth | $275,545.00 135,253.200 MASK | 0.5602% |
24 | HitBTC | MASK-USDT | $2.04 0.0008204 Eth | $205,500.00 99,066.210 MASK | 0.4103% |
25 | FMFW.io | MASK-USDT | $2.04 0.0008215 Eth | $201,733.00 99,066.210 MASK | 0.4103% |
26 | BitDelta | MASK-USDT | $2.03 0.0008198 Eth | $190,515.00 91,881.100 MASK | 0.3805% |
27 | Icrypex | MASK-USDT | $2.06 0.0008306 Eth | $182,803.00 88,684.855 MASK | 0.3673% |
28 | DigiFinex | MASK-USDT | $2.04 0.0008202 Eth | $180,455.00 88,651.390 MASK | 0.3672% |
29 | KuCoin | MASK-USDT | $2.02 0.0008150 Eth | $179,118.00 88,582.275 MASK | 0.3669% |
30 | FameEX | MASK-USDT | $2.04 0.0008200 Eth | $173,224.00 83,936.000 MASK | 0.3476% |
31 | LATOKEN | MASK-USDT | $2.04 0.0008200 Eth | $169,954.00 83,510.429 MASK | 0.3459% |
32 | OrangeX | MASK-USDT | $2.03 0.0008200 Eth | $160,318.00 77,664.910 MASK | 0.3217% |
33 | Gate.io | MASK-USDT | $2.04 0.0008203 Eth | $157,672.00 76,611.160 MASK | 0.3173% |
34 | BIT | MASK-USDT | $2.03 0.0008193 Eth | $144,870.00 71,326.887 MASK | 0.2954% |
35 | AscendEX (BitMax) | MASK-USDT | $2.04 0.0008223 Eth | $137,992.00 67,634.800 MASK | 0.2801% |
36 | Dex-Trade | MASK-USDT | $2.04 0.0008218 Eth | $137,178.00 67,253.300 MASK | 0.2785% |
37 | Tapbit | MASK-USDT | $2.03 0.0008211 Eth | $133,837.00 64,617.500 MASK | 0.2676% |
38 | Phemex | MASK-USDT | $2.02 0.0008178 Eth | $133,523.00 66,262.016 MASK | 0.2744% |
39 | CoinEx | MASK-USDT | $2.03 0.0008168 Eth | $127,898.00 63,241.859 MASK | 0.2619% |
40 | ProBit Global | MASK-USDT | $2.02 0.0008131 Eth | $119,034.00 59,008.299 MASK | 0.2444% |
41 | Icrypex | MASK-TRY | $2.04 0.0008203 Eth | $118,109.00 58,018.528 MASK | 0.2403% |
42 | BitMart | MASK-USDT | $2.03 0.0008182 Eth | $97,155.00 47,858.360 MASK | 0.1982% |
43 | bitcastle | MASK-USDT | $2.04 0.0008201 Eth | $84,654.00 41,053.200 MASK | 0.1700% |
44 | BingX | MASK-USDT | $2.04 0.0008201 Eth | $80,824.00 39,087.283 MASK | 0.1619% |
45 | BtcTurk | Kripto | MASK-TRY | $2.03 0.0008185 Eth | $77,815.00 38,308.020 MASK | 0.1587% |
46 | BTSE | MASK-USDT | $2.04 0.0008203 Eth | $69,323.00 34,049.074 MASK | 0.1410% |
47 | Bithumb | MASK-KRW | $2.06 0.0008309 Eth | $66,507.00 32,248.227 MASK | 0.1336% |
48 | Kraken | MASK-USD | $2.02 0.0008134 Eth | $65,584.00 32,499.719 MASK | 0.1346% |
49 | Bitvavo | MASK-EUR | $2.02 0.0008149 Eth | $62,815.00 31,095.192 MASK | 0.1288% |
50 | Max Maicoin | MASK-USDT | $2.02 0.0008198 Eth | $62,172.00 30,727.400 MASK | 0.1273% |
51 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.03 0.0008190 Eth | $54,102.00 26,104.105 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1081% |
52 | Byte Exchange | MASK-USDT | $2.04 0.0008209 Eth | $51,654.00 25,354.500 MASK | 0.1050% |
53 | PointPay | MASK-USDT | $2.04 0.0008215 Eth | $47,554.00 23,059.764 MASK | 0.0955% |
54 | Dex-Trade | MASK-BNB | $2.03 0.0008161 Eth | $45,936.00 22,678.400 MASK | 0.0939% |
55 | CoinW | MASK-USDT | $2.03 0.0008197 Eth | $39,068.00 19,205.072 MASK | 0.0795% |
56 | Coinbase Exchange | MASK-EUR | $1.98 0.0007993 Eth | $38,859.00 19,590.860 MASK | 0.0811% |
57 | Pionex | MASK-USDT | $2.04 0.0008205 Eth | $32,998.00 16,061.996 MASK | 0.0665% |
58 | Binance | MASK-TRY | $2.03 0.0008198 Eth | $32,872.00 15,726.500 MASK | 0.0651% |
59 | BtcTurk | Kripto | MASK-USDT | $1.99 0.0007999 Eth | $30,512.00 15,370.230 MASK | 0.0637% |
60 | Binance | MASK-BNB | $2.03 0.0008165 Eth | $28,747.00 13,967.800 MASK | 0.0579% |
61 | MEXC | MASK-USDT | $2.04 0.0008214 Eth | $28,636.00 14,045.890 MASK | 0.0582% |
62 | Coinbase Exchange | MASK-USDT | $2.02 0.0008141 Eth | $27,717.00 13,719.630 MASK | 0.0568% |
63 | Bitbank | MASK-JPY | $2.03 0.0008163 Eth | $27,082.00 13,368.161 MASK | 0.0554% |
64 | Nominex | MASK-USDT | $2.04 0.0008212 Eth | $22,933.00 11,252.060 MASK | 0.0466% |
65 | Crypto.com Exchange | MASK-USDT | $2.04 0.0008201 Eth | $21,268.00 10,450.500 MASK | 0.0433% |
66 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.03 0.0008214 Eth | $19,694.66 9,481.295 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0393% |
67 | Koinpark | MASK-USDT | $2.04 0.0008209 Eth | $19,665.58 9,652.971 MASK | 0.0400% |
68 | Cryptology | MASK-USDT | $2.03 0.0008207 Eth | $16,185.14 7,956.000 MASK | 0.0330% |
69 | Bitlo | MASK-TRY | $2.03 0.0008192 Eth | $13,081.28 6,271.200 MASK | 0.0260% |
70 | Bitci TR | MASK-TRY | $2.04 0.0008237 Eth | $9,554.78 4,570.630 MASK | 0.0189% |
71 | Paribu | MASK-TRY | $2.04 0.0008266 Eth | $7,771.00 3,809.010 MASK | 0.0158% |
72 | Kanga | MASK-USDT | $2.03 0.0008197 Eth | $6,585.35 0.000 MASK | 0.0000% |
73 | Vindax | MASK-USDT | $2.02 0.0008129 Eth | $5,854.68 2,902.300 MASK | 0.0120% |
74 | Coinbase Exchange | MASK-GBP | $2.02 0.0008134 Eth | $5,381.01 2,665.760 MASK | 0.0110% |
75 | WEEX | MASK-USDT | $2.04 0.0008209 Eth | $5,192.95 2,505.000 MASK | 0.0104% |
76 | Crypto.com Exchange | MASK-USD | $2.04 0.0008215 Eth | $3,942.04 1,933.700 MASK | 0.0080% |
77 | Gemini | MASK-USD | $2.02 0.0008144 Eth | $3,099.43 1,533.611 MASK | 0.0064% |
78 | OKX | MASK-USDC | $2.04 0.0008218 Eth | $2,349.56 1,153.662 MASK | 0.0048% |
79 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.00 0.0008113 Eth | $1,912.23 938.184 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0039% |
80 | Mudrex | MASK-USDT | $2.04 0.0008212 Eth | $1,369.84 672.934 MASK | 0.0028% |
81 | TokoCrypto | MASK-USDT | $2.02 0.0008193 Eth | $776.11 383.513 MASK | 0.0016% |
82 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.04 0.0008206 Eth | $687.18 313.485 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0013% |
83 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.02 0.0008146 Eth | $576.79 281.801 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0012% |
84 | Nominex | MASK-BNB | $2.03 0.0008161 Eth | $568.85 280.839 MASK | 0.0012% |
85 | Binance US | MASK-USDT | $1.99 0.0008033 Eth | $314.14 157.570 MASK | 0.0007% |
86 | OKCoin Japan | MASK-JPY | $2.03 0.0008208 Eth | $230.99 109.123 MASK | 0.0005% |
87 | Kraken | MASK-EUR | $2.12 0.0008534 Eth | $163.54 77.243 MASK | 0.0003% |
88 | Bit2Me | MASK-EUR | $2.12 0.0008534 Eth | $162.21 75.698 MASK | 0.0003% |
89 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $2.01 0.0008173 Eth | $62.92 30.201 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
90 | Bittime | MASK-IDR | $2.04 0.0008246 Eth | $47.19 22.350 MASK | 0.0001% |
91 | CEX.IO | MASK-USDT | $2.04 0.0008217 Eth | $34.92 16.871 MASK | 0.0001% |
92 | TokoCrypto | MASK-BNB | $2.03 0.0008167 Eth | $33.70 16.632 MASK | 0.0001% |
93 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $2.01 0.0008131 Eth | $32.16 15.897 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
94 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.02 0.0008204 Eth | $28.08 13.455 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
95 | Mercado Bitcoin | MASK-BRL | $2.04 0.0008230 Eth | $26.08 12.766 MASK | 0.0001% |
96 | CEX.IO | MASK-USD | $2.04 0.0008234 Eth | $25.36 12.470 MASK | 0.0001% |
97 | Gate.io | MASK-ETH | $2.03 0.0008199 Eth | $23.98 11.768 MASK | 0.0000% |
98 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $2.03 0.0008175 Eth | $18.35 9.255 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
99 | Gate.io | MASK-TRY | $2.02 0.0008153 Eth | $6.30 3.048 MASK | 0.0000% |
100 | Nominex | MASK-TRY | $2.03 0.0008193 Eth | $2.69 1.326 MASK | 0.0000% |
Contract Name:
MaskToken
Compiler Version
v0.6.6+commit.6c089d02
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2021-02-19 */ // File: @openzeppelin/contracts/token/ERC20/IERC20.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } // File: @openzeppelin/contracts/utils/Context.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // File: @openzeppelin/contracts/math/SafeMath.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } } // File: @openzeppelin/contracts/token/ERC20/ERC20.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) public { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal virtual { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } } // File: contracts/mask.sol // SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; contract MaskToken is ERC20 { constructor() ERC20("Mask Network", "MASK") public { _mint(msg.sender, 100_000_000 * (10 ** uint256(decimals()))); } }
Contract Security Audit
- SECBIT Lab - February 22nd, 2021 - Security Audit Report
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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