Overview
Max Total Supply
100,000,000 MASK
Holders
13,865 (0.00%)
Market
Price
$3.07 @ 0.001234 ETH (+17.08%)
Onchain Market Cap
$307,000,000.00
Circulating Supply Market Cap
$308,772,721.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
785.6187437506844693 MASKValue
$2,411.85 ( ~0.969462870973085 Eth) [0.0008%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Upbit | MASK-KRW | $3.08 0.0012367 Eth | $107,998,767.00 35,059,508.743 MASK | 23.8398% |
2 | BTCC | MASK-USDT | $3.09 0.0012405 Eth | $67,565,707.00 23,925,798.600 MASK | 16.2691% |
3 | Bitrue | MASK-USDT | $3.08 0.0012394 Eth | $62,091,822.00 20,142,163.300 MASK | 13.6963% |
4 | Binance | MASK-USDT | $3.11 0.0012438 Eth | $51,513,464.00 18,287,324.500 MASK | 12.4351% |
5 | Gate.io | MASK-USDT | $3.09 0.0012405 Eth | $25,851,868.00 9,119,956.080 MASK | 6.2014% |
6 | Nami.Exchange | MASK-USDT | $3.05 0.0012313 Eth | $20,921,168.00 6,859,077.400 MASK | 4.6641% |
7 | OKX | MASK-USDT | $3.08 0.0012366 Eth | $20,863,701.00 7,311,815.844 MASK | 4.9719% |
8 | Bithumb | MASK-KRW | $3.09 0.0012412 Eth | $20,566,743.00 6,665,629.532 MASK | 4.5325% |
9 | Bybit | MASK-USDT | $3.09 0.0012402 Eth | $19,655,447.00 7,096,617.480 MASK | 4.8256% |
10 | WhiteBIT | MASK-USDT | $3.06 0.0012369 Eth | $14,532,183.00 4,741,706.571 MASK | 3.2243% |
11 | BYDFi | MASK-USDT | $3.10 0.0012425 Eth | $10,311,743.00 3,322,614.900 MASK | 2.2593% |
12 | Bitunix | MASK-USDT | $3.03 0.0012232 Eth | $8,869,511.00 2,925,914.420 MASK | 1.9896% |
13 | Websea | MASK-USDT | $3.09 0.0012428 Eth | $7,776,271.00 0.000 MASK | 0.0000% |
14 | Hotcoin | MASK-USDT | $3.06 0.0012362 Eth | $6,547,210.00 2,138,118.700 MASK | 1.4539% |
15 | Toobit | MASK-USDT | $3.03 0.0012245 Eth | $5,133,292.00 1,817,960.400 MASK | 1.2362% |
16 | BtcTurk | Kripto | MASK-TRY | $3.09 0.0012425 Eth | $4,420,243.00 1,431,114.600 MASK | 0.9731% |
17 | KuCoin | MASK-USDT | $3.08 0.0012347 Eth | $4,349,170.00 1,413,931.953 MASK | 0.9614% |
18 | Ourbit | MASK-USDT | $3.08 0.0012377 Eth | $3,511,330.00 1,242,040.470 MASK | 0.8446% |
19 | Binance | MASK-TRY | $3.09 0.0012409 Eth | $3,340,622.00 1,180,474.400 MASK | 0.8027% |
20 | Biconomy.com | MASK-USDT | $3.06 0.0012318 Eth | $3,040,403.00 1,080,298.100 MASK | 0.7346% |
21 | Paribu | MASK-TRY | $3.06 0.0012336 Eth | $2,491,601.00 813,851.630 MASK | 0.5534% |
22 | Deepcoin | MASK-USDT | $3.06 0.0012369 Eth | $2,455,464.00 841,456.400 MASK | 0.5722% |
23 | Bitget | MASK-USDT | $3.08 0.0012375 Eth | $2,452,561.00 872,741.820 MASK | 0.5934% |
24 | HTX | MASK-USDT | $3.08 0.0012399 Eth | $2,241,111.00 798,228.106 MASK | 0.5428% |
25 | Coinbase Exchange | MASK-USD | $3.07 0.0012393 Eth | $1,733,748.00 564,738.720 MASK | 0.3840% |
26 | BTSE | MASK-USDT | $3.07 0.0012382 Eth | $1,700,871.00 553,967.576 MASK | 0.3767% |
27 | OrangeX | MASK-USDT | $3.08 0.0012404 Eth | $1,687,477.00 597,937.650 MASK | 0.4066% |
28 | DigiFinex | MASK-USDT | $3.08 0.0012346 Eth | $1,590,427.00 517,164.556 MASK | 0.3517% |
29 | bitcastle | MASK-USDT | $3.05 0.0012299 Eth | $1,567,494.00 553,750.400 MASK | 0.3765% |
30 | Bitvavo | MASK-EUR | $3.05 0.0012239 Eth | $1,565,585.00 513,500.455 MASK | 0.3492% |
31 | Bibox | MASK-USDT | $3.11 0.0012492 Eth | $1,524,736.00 490,007.000 MASK | 0.3332% |
32 | Dex-Trade | MASK-USDT | $3.17 0.0012676 Eth | $1,524,417.00 480,329.500 MASK | 0.3266% |
33 | Phemex | MASK-USDT | $3.03 0.0012245 Eth | $1,125,125.00 370,794.436 MASK | 0.2521% |
34 | FameEX | MASK-USDT | $3.07 0.0012352 Eth | $1,065,983.00 377,075.100 MASK | 0.2564% |
35 | Trubit | MASK-USDT | $3.07 0.0012377 Eth | $1,064,969.00 376,701.400 MASK | 0.2562% |
36 | Byte Exchange | MASK-USDT | $3.14 0.0012529 Eth | $975,929.00 311,040.400 MASK | 0.2115% |
37 | PointPay | MASK-USDT | $3.07 0.0012352 Eth | $843,391.00 297,754.052 MASK | 0.2025% |
38 | BingX | MASK-USDT | $3.08 0.0012345 Eth | $814,674.00 290,284.163 MASK | 0.1974% |
39 | CoinW | MASK-USDT | $3.08 0.0012381 Eth | $739,567.00 239,810.597 MASK | 0.1631% |
40 | Koinpark | MASK-USDT | $3.18 0.0012694 Eth | $524,957.00 165,255.350 MASK | 0.1124% |
41 | LBank | MASK-USDT | $3.08 0.0012385 Eth | $516,147.00 167,310.480 MASK | 0.1138% |
42 | Tapbit | MASK-USDT | $3.08 0.0012385 Eth | $477,045.00 168,391.000 MASK | 0.1145% |
43 | BitMart | MASK-USDT | $3.06 0.0012364 Eth | $472,260.00 154,190.300 MASK | 0.1048% |
44 | Icrypex | MASK-USDT | $3.02 0.0012183 Eth | $411,966.00 136,473.740 MASK | 0.0928% |
45 | BIT | MASK-USDT | $3.16 0.0012683 Eth | $381,614.00 120,681.066 MASK | 0.0821% |
46 | Nominex | MASK-USDT | $3.06 0.0012346 Eth | $368,708.00 120,479.904 MASK | 0.0819% |
47 | BitDelta | MASK-USDT | $3.07 0.0012352 Eth | $327,917.00 116,883.000 MASK | 0.0795% |
48 | Kraken | MASK-USD | $3.07 0.0012333 Eth | $316,232.00 102,940.265 MASK | 0.0700% |
49 | Binance | MASK-BNB | $3.07 0.0012342 Eth | $303,603.00 104,719.200 MASK | 0.0712% |
50 | DeGate | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.07 0.0012382 Eth | $252,522.00 90,099.292 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0613% |
51 | CoinEx | MASK-USDT | $3.03 0.0012241 Eth | $236,854.00 84,289.548 MASK | 0.0573% |
52 | MEXC | MASK-USDT | $3.09 0.0012411 Eth | $235,592.00 76,356.740 MASK | 0.0519% |
53 | BloFin | MASK-USDT | $3.07 0.0012376 Eth | $227,841.00 80,924.000 MASK | 0.0550% |
54 | Pionex | MASK-USDT | $3.09 0.0012424 Eth | $222,729.00 78,494.536 MASK | 0.0534% |
55 | Max Maicoin | MASK-USDT | $3.07 0.0012381 Eth | $212,194.00 69,022.500 MASK | 0.0469% |
56 | OKX | MASK-USDC | $3.09 0.0012426 Eth | $168,932.00 59,140.578 MASK | 0.0402% |
57 | AscendEX (BitMax) | MASK-USDT | $3.08 0.0012377 Eth | $149,221.00 48,394.400 MASK | 0.0329% |
58 | CoinTR | MASK-USDT | $3.08 0.0012378 Eth | $146,997.00 52,564.600 MASK | 0.0357% |
59 | CoinTR | MASK-TRY | $3.08 0.0012418 Eth | $130,864.00 46,808.000 MASK | 0.0318% |
60 | LATOKEN | MASK-USDT | $3.03 0.0012238 Eth | $125,211.00 41,256.181 MASK | 0.0281% |
61 | TokoCrypto | MASK-USDT | $3.05 0.0012301 Eth | $112,949.00 37,040.623 MASK | 0.0252% |
62 | Coinbase Exchange | MASK-USDT | $3.05 0.0012305 Eth | $105,038.00 34,459.600 MASK | 0.0234% |
63 | Vindax | MASK-USDT | $3.10 0.0012398 Eth | $94,926.00 30,588.400 MASK | 0.0208% |
64 | Crypto.com Exchange | MASK-USDT | $3.08 0.0012347 Eth | $79,884.00 25,970.500 MASK | 0.0177% |
65 | Crypto.com Exchange | MASK-USD | $3.04 0.0012215 Eth | $42,231.00 13,896.300 MASK | 0.0094% |
66 | Bitlo | MASK-TRY | $3.05 0.0012286 Eth | $40,656.00 13,897.547 MASK | 0.0095% |
67 | Coinbase Exchange | MASK-GBP | $3.15 0.0012731 Eth | $37,050.00 11,748.780 MASK | 0.0080% |
68 | Kraken | MASK-EUR | $3.07 0.0012323 Eth | $30,736.00 10,012.853 MASK | 0.0068% |
69 | Bit2Me | MASK-EUR | $3.06 0.0012331 Eth | $29,398.00 9,807.237 MASK | 0.0067% |
70 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2 | $3.12 0.0012535 Eth | $27,222.00 9,515.215 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0065% |
71 | Coinbase Exchange | MASK-EUR | $3.07 0.0012390 Eth | $26,443.00 8,615.770 MASK | 0.0059% |
72 | Cryptology | MASK-USDT | $3.10 0.0012431 Eth | $23,992.00 7,741.100 MASK | 0.0053% |
73 | Nominex | MASK-TRY | $3.08 0.0012427 Eth | $23,622.00 7,659.753 MASK | 0.0052% |
74 | Mudrex | MASK-USDT | $3.08 0.0012374 Eth | $19,288.22 6,257.567 MASK | 0.0043% |
75 | WEEX | MASK-USDT | $3.06 0.0012332 Eth | $18,426.40 6,590.000 MASK | 0.0045% |
76 | Gemini | MASK-USD | $3.05 0.0012228 Eth | $16,192.94 5,314.389 MASK | 0.0036% |
77 | Bitci TR | MASK-TRY | $3.06 0.0012325 Eth | $15,710.56 5,590.950 MASK | 0.0038% |
78 | PancakeSwap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $3.04 0.0012224 Eth | $13,602.95 4,860.872 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0033% |
79 | Coinone | MASK-KRW | $3.17 0.0012714 Eth | $11,296.75 3,567.005 MASK | 0.0024% |
80 | Kanga | MASK-USDT | $3.17 0.0012672 Eth | $11,192.93 0.000 MASK | 0.0000% |
81 | Dex-Trade | MASK-BNB | $3.12 0.0012568 Eth | $10,341.61 3,317.800 MASK | 0.0023% |
82 | OKCoin Japan | MASK-JPY | $3.04 0.0012241 Eth | $8,569.78 3,037.163 MASK | 0.0021% |
83 | Gate.io | MASK-TRY | $3.16 0.0012686 Eth | $5,159.51 1,756.324 MASK | 0.0012% |
84 | Quickswap | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174 | $3.04 0.0012199 Eth | $4,869.87 1,742.812 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 0.0012% |
85 | PancakeSwap (v2) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C | $3.08 0.0012369 Eth | $3,732.96 1,289.355 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0009% |
86 | Binance US | MASK-USDT | $3.06 0.0012329 Eth | $2,874.44 937.861 MASK | 0.0006% |
87 | Nominex | MASK-BNB | $3.05 0.0012318 Eth | $2,327.06 762.119 MASK | 0.0005% |
88 | CEX.IO | MASK-USDT | $3.08 0.0012373 Eth | $2,261.49 813.400 MASK | 0.0006% |
89 | Upbit Indonesia | MASK-BTC | $3.11 0.0012563 Eth | $1,517.04 487.372 MASK | 0.0003% |
90 | Gate.io | MASK-ETH | $3.07 0.0012351 Eth | $856.71 296.709 MASK | 0.0002% |
91 | Mercado Bitcoin | MASK-BRL | $3.12 0.0012601 Eth | $635.62 203.625 MASK | 0.0001% |
92 | Upbit | MASK-BTC | $3.13 0.0012551 Eth | $622.77 199.195 MASK | 0.0001% |
93 | Uniswap V3 (Ethereum) | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7 | $3.08 0.0012348 Eth | $570.45 194.991 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0001% |
94 | TokoCrypto | MASK-BNB | $3.07 0.0012370 Eth | $409.68 133.542 MASK | 0.0001% |
95 | PancakeSwap V3 (BSC) | 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8 | $3.08 0.0012311 Eth | $401.64 137.828 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3 | 0.0001% |
96 | Sushiswap | 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48 | $2.95 0.0011891 Eth | $211.09 73.301 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074 | 0.0000% |
97 | Bittime | MASK-IDR | $3.05 0.0012285 Eth | $109.08 38.410 MASK | 0.0000% |
98 | Energiswap | 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4 | $3.13 0.0012603 Eth | $109.05 38.755 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E | 0.0000% |
99 | CEX.IO | MASK-USD | $3.09 0.0012391 Eth | $49.50 17.881 MASK | 0.0000% |
100 | Uniswap V3 (Polygon) | 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270 | $3.04 0.0012265 Eth | $34.26 11.951 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7 | 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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