Overview
Max Total Supply
100,000,000 MASK
Holders
13,965 (0.00%)
Market
Price
$2.98 @ 0.000893 ETH (+0.46%)
Onchain Market Cap
$298,000,000.00
Circulating Supply Market Cap
$298,335,829.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
5,484.364055400696931365 MASKValue
$16,343.40 ( ~4.8948 Eth) [0.0055%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | BTCC | MASK-USDT | $2.98 0.0008911 Eth | $24,437,317.00 8,145,438.800 MASK | 32.7887% |
2 | Bitrue | MASK-USDT | $2.97 0.0008905 Eth | $15,019,027.00 5,051,057.000 MASK | 20.3325% |
3 | Bibox | MASK-USDT | $2.99 0.0008961 Eth | $5,499,367.00 1,837,975.000 MASK | 7.3986% |
4 | Binance | MASK-USDT | $2.98 0.0008924 Eth | $5,311,478.00 1,765,083.500 MASK | 7.1052% |
5 | Upbit | MASK-KRW | $3.03 0.0009087 Eth | $4,950,911.00 1,631,628.176 MASK | 6.5680% |
6 | LBank | MASK-USDT | $2.97 0.0008908 Eth | $4,585,072.00 1,541,509.270 MASK | 6.2052% |
7 | Websea | MASK-USDT | $2.97 0.0008902 Eth | $1,937,039.00 0.000 MASK | 0.0000% |
8 | HTX | MASK-USDT | $2.97 0.0008905 Eth | $1,780,465.00 594,214.551 MASK | 2.3920% |
9 | Bitget | MASK-USDT | $2.97 0.0008908 Eth | $1,517,985.00 506,183.208 MASK | 2.0376% |
10 | OKX | MASK-USDT | $2.97 0.0008890 Eth | $1,163,736.00 386,105.566 MASK | 1.5542% |
11 | Bybit | MASK-USDT | $2.98 0.0008911 Eth | $1,135,475.00 376,114.130 MASK | 1.5140% |
12 | BYDFi | MASK-USDT | $2.99 0.0008944 Eth | $1,117,061.00 373,925.700 MASK | 1.5052% |
13 | Hotcoin | MASK-USDT | $2.98 0.0008922 Eth | $1,090,899.00 366,156.600 MASK | 1.4739% |
14 | Trubit | MASK-USDT | $2.98 0.0008932 Eth | $980,641.00 327,308.700 MASK | 1.3175% |
15 | WhiteBIT | MASK-USDT | $2.97 0.0008916 Eth | $948,470.00 318,951.438 MASK | 1.2839% |
16 | Bithumb | MASK-KRW | $3.05 0.0009120 Eth | $932,059.00 306,075.257 MASK | 1.2321% |
17 | Deepcoin | MASK-USDT | $2.97 0.0008905 Eth | $931,131.00 314,668.000 MASK | 1.2667% |
18 | Biconomy.com | MASK-USDT | $2.99 0.0008949 Eth | $747,807.00 249,364.524 MASK | 1.0038% |
19 | Gate.io | MASK-USDT | $2.98 0.0008920 Eth | $681,343.00 225,852.240 MASK | 0.9091% |
20 | CoinW | MASK-USDT | $2.98 0.0008910 Eth | $574,194.00 192,984.997 MASK | 0.7768% |
21 | Toobit | MASK-USDT | $2.97 0.0008907 Eth | $558,433.00 185,638.870 MASK | 0.7473% |
22 | Binance | MASK-TRY | $3.00 0.0008973 Eth | $492,702.00 163,484.800 MASK | 0.6581% |
23 | Bitunix | MASK-USDT | $2.98 0.0008916 Eth | $426,557.00 143,220.400 MASK | 0.5765% |
24 | Ourbit | MASK-USDT | $2.97 0.0008907 Eth | $410,461.00 136,445.480 MASK | 0.5492% |
25 | OrangeX | MASK-USDT | $2.98 0.0008916 Eth | $397,310.00 132,122.450 MASK | 0.5318% |
26 | MEXC | MASK-USDT | $2.98 0.0008910 Eth | $319,983.00 107,545.430 MASK | 0.4329% |
27 | KuCoin | MASK-USDT | $2.98 0.0008912 Eth | $271,265.00 91,158.815 MASK | 0.3670% |
28 | BitDelta | MASK-USDT | $2.98 0.0008917 Eth | $248,636.00 82,969.100 MASK | 0.3340% |
29 | Phemex | MASK-USDT | $2.96 0.0008870 Eth | $224,435.00 75,805.580 MASK | 0.3051% |
30 | BIT | MASK-USDT | $2.99 0.0008937 Eth | $210,270.00 70,433.288 MASK | 0.2835% |
31 | Icrypex | MASK-USDT | $2.96 0.0008855 Eth | $203,282.00 68,737.020 MASK | 0.2767% |
32 | BtcTurk | Kripto | MASK-TRY | $3.01 0.0009001 Eth | $177,301.00 58,992.920 MASK | 0.2375% |
33 | Dex-Trade | MASK-USDT | $2.98 0.0008925 Eth | $173,709.00 58,285.300 MASK | 0.2346% |
34 | CoinTR | MASK-TRY | $3.00 0.0008982 Eth | $168,718.00 55,928.600 MASK | 0.2251% |
35 | Byte Exchange | MASK-USDT | $2.97 0.0008898 Eth | $165,936.00 55,841.854 MASK | 0.2248% |
36 | CoinTR | MASK-USDT | $2.98 0.0008916 Eth | $149,818.00 49,996.400 MASK | 0.2013% |
37 | BVOX | MASK-USDT | $2.98 0.0008916 Eth | $148,169.00 49,418.700 MASK | 0.1989% |
38 | Coinbase Exchange | MASK-USD | $2.99 0.0008954 Eth | $147,946.00 49,480.300 MASK | 0.1992% |
39 | Hibt | MASK-USDT | $2.98 0.0008917 Eth | $138,943.00 46,104.479 MASK | 0.1856% |
40 | AscendEX (BitMax) | MASK-USDT | $2.98 0.0008938 Eth | $133,675.00 44,791.000 MASK | 0.1803% |
41 | DigiFinex | MASK-USDT | $2.98 0.0008912 Eth | $130,765.00 43,940.198 MASK | 0.1769% |
42 | Tapbit | MASK-USDT | $2.98 0.0008910 Eth | $129,955.00 43,298.900 MASK | 0.1743% |
43 | ProBit Global | MASK-USDT | $2.97 0.0008911 Eth | $127,263.00 42,785.000 MASK | 0.1722% |
44 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.98 0.0008917 Eth | $123,262.00 41,098.443 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1654% |
45 | FameEX | MASK-USDT | $2.98 0.0008919 Eth | $112,377.00 37,356.500 MASK | 0.1504% |
46 | BitMart | MASK-USDT | $2.97 0.0008908 Eth | $107,885.00 36,270.180 MASK | 0.1460% |
47 | BingX | MASK-USDT | $2.97 0.0008908 Eth | $103,611.00 34,468.451 MASK | 0.1387% |
48 | PointPay | MASK-USDT | $2.99 0.0008941 Eth | $87,427.00 29,041.626 MASK | 0.1169% |
49 | Uniswap V2 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.98 0.0008923 Eth | $81,397.00 27,102.544 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.1091% |
50 | Binance | MASK-BNB | $3.00 0.0008993 Eth | $68,289.00 22,774.200 MASK | 0.0917% |
51 | BTSE | MASK-USDT | $2.97 0.0008908 Eth | $64,574.00 21,708.722 MASK | 0.0874% |
52 | BloFin | MASK-USDT | $2.98 0.0008922 Eth | $56,104.00 18,694.800 MASK | 0.0753% |
53 | Kraken | MASK-USD | $3.00 0.0008988 Eth | $55,561.00 18,514.325 MASK | 0.0745% |
54 | Koinpark | MASK-USDT | $2.98 0.0008913 Eth | $48,406.00 16,263.612 MASK | 0.0655% |
55 | BtcTurk | Kripto | MASK-USDT | $3.00 0.0008994 Eth | $46,409.00 15,452.600 MASK | 0.0622% |
56 | CoinEx | MASK-USDT | $2.97 0.0008888 Eth | $44,671.00 14,924.350 MASK | 0.0601% |
57 | Bitbank | MASK-JPY | $2.99 0.0008960 Eth | $43,675.00 14,598.634 MASK | 0.0588% |
58 | Bitvavo | MASK-EUR | $2.95 0.0008844 Eth | $38,875.00 13,163.014 MASK | 0.0530% |
59 | Paribu | MASK-TRY | $3.04 0.0009114 Eth | $23,943.00 7,867.310 MASK | 0.0317% |
60 | Tothemoon | MASK-USDT | $2.98 0.0008934 Eth | $23,432.00 7,854.000 MASK | 0.0316% |
61 | LATOKEN | MASK-USDT | $2.98 0.0008910 Eth | $18,026.40 6,058.473 MASK | 0.0244% |
62 | Bitci TR | MASK-TRY | $2.98 0.0008910 Eth | $17,492.75 5,796.210 MASK | 0.0233% |
63 | Pionex | MASK-USDT | $2.98 0.0008938 Eth | $16,052.89 5,333.102 MASK | 0.0215% |
64 | bitcastle | MASK-USDT | $2.99 0.0008937 Eth | $11,949.20 3,965.600 MASK | 0.0160% |
65 | Coinbase Exchange | MASK-USDT | $2.98 0.0008911 Eth | $10,509.39 3,531.880 MASK | 0.0142% |
66 | Vindax | MASK-USDT | $2.99 0.0008950 Eth | $9,430.46 3,153.500 MASK | 0.0127% |
67 | Coinbase Exchange | MASK-EUR | $3.02 0.0009054 Eth | $7,564.41 2,501.960 MASK | 0.0101% |
68 | Kanga | MASK-USDT | $2.98 0.0008913 Eth | $7,392.87 0.000 MASK | 0.0000% |
69 | Bitlo | MASK-TRY | $3.00 0.0008980 Eth | $7,283.37 2,409.675 MASK | 0.0097% |
70 | Crypto.com Exchange | MASK-USDT | $2.98 0.0008928 Eth | $5,712.27 1,916.300 MASK | 0.0077% |
71 | Mudrex | MASK-USDT | $2.97 0.0008896 Eth | $3,937.47 1,325.550 MASK | 0.0053% |
72 | Gemini | MASK-USD | $2.97 0.0008889 Eth | $3,587.62 1,208.767 MASK | 0.0049% |
73 | Nami.Exchange | MASK-VNST | $2.99 0.0008963 Eth | $3,443.70 1,150.704 MASK | 0.0046% |
74 | Nami.Exchange | MASK-USDT | $2.98 0.0008914 Eth | $3,397.01 1,141.333 MASK | 0.0046% |
75 | Kraken | MASK-EUR | $3.02 0.0009045 Eth | $3,352.56 1,110.020 MASK | 0.0045% |
76 | OKX | MASK-USDC | $3.00 0.0008979 Eth | $3,313.56 1,098.048 MASK | 0.0044% |
77 | Bit2Me | MASK-EUR | $3.02 0.0009045 Eth | $3,285.51 1,087.820 MASK | 0.0044% |
78 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $3.03 0.0009061 Eth | $3,113.24 1,043.108 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0042% |
79 | Coinbase Exchange | MASK-GBP | $3.01 0.0009010 Eth | $2,867.14 953.020 MASK | 0.0038% |
80 | Upbit | MASK-BTC | $2.91 0.0008730 Eth | $2,762.21 947.596 MASK | 0.0038% |
81 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $2.98 0.0008925 Eth | $2,739.21 912.093 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0037% |
82 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $2.99 0.0008966 Eth | $2,350.34 815.678 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0033% |
83 | Dex-Trade | MASK-BNB | $3.02 0.0009031 Eth | $2,305.11 764.500 MASK | 0.0031% |
84 | WEEX | MASK-USDT | $2.97 0.0008908 Eth | $1,903.95 634.100 MASK | 0.0026% |
85 | Crypto.com Exchange | MASK-USD | $3.02 0.0009038 Eth | $1,164.91 386.000 MASK | 0.0016% |
86 | OKCoin Japan | MASK-JPY | $3.00 0.0008987 Eth | $1,003.64 332.495 MASK | 0.0013% |
87 | Binance US | MASK-USDT | $2.95 0.0008847 Eth | $804.19 272.185 MASK | 0.0011% |
88 | PancakeSwap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.02 0.0009037 Eth | $537.13 178.687 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0007% |
89 | Coinone | MASK-KRW | $3.10 0.0009287 Eth | $474.07 152.884 MASK | 0.0006% |
90 | Bittime | MASK-IDR | $3.01 0.0009022 Eth | $266.35 87.880 MASK | 0.0004% |
91 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $3.01 0.0009003 Eth | $226.93 77.894 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0003% |
92 | BabySwap | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955 | $2.99 0.0008963 Eth | $135.36 46.052 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0002% |
93 | Indodax | MASK-IDR | $3.06 0.0009150 Eth | $64.64 21.156 MASK | 0.0001% |
94 | Bancor (V2) | MASK-BNT | $3.33 0.0009960 Eth | $54.77 16.472 MASK | 0.0001% |
95 | CEX.IO | MASK-USD | $2.98 0.0008916 Eth | $53.95 18.136 MASK | 0.0001% |
96 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $3.02 0.0009037 Eth | $53.41 17.695 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0001% |
97 | CEX.IO | MASK-USDT | $2.98 0.0008919 Eth | $45.80 15.469 MASK | 0.0001% |
98 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $3.01 0.0009012 Eth | $20.31 6.817 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0000% |
99 | TokoCrypto | MASK-USDT | $2.97 0.0008899 Eth | $11.47 3.863 MASK | 0.0000% |
100 | Mercado Bitcoin | MASK-BRL | $3.35 0.0010031 Eth | $11.45 3.420 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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