ETH Price: $3,478.58 (-1.12%)
Gas: 5 Gwei

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,781 ( -0.022%)

Market

Price

$2.40 @ 0.000690 ETH (-3.40%)

Onchain Market Cap

$240,000,000.00

Circulating Supply Market Cap

$239,286,138.00

Other Info

Token Contract (WITH 18 Decimals)

Filtered by Token Holder
odegaard8.eth
Balance
0.026937816126300478 MASK

Value
$0.06 ( ~1.72484083008131E-05 Eth) [0.0000%]
0xdfa602d5a7a41c302ab29650196adda6b37b972f
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OVERVIEW

Mask Network allows users to encrypt content when posting on You-Know-Where and only the users and their friends can decrypt them.

Market

Volume (24H):$42,264,486.00
Market Capitalization:$239,286,138.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Gate.io
MASK-ETH$2.42
0.0006970 Eth
$9,804,743.00
4,006,280.426 MASK
23.9258%
2
Bibox
MASK-USDT$2.40
0.0006895 Eth
$4,257,416.00
1,775,254.000 MASK
10.6020%
3
HTX
MASK-USDT$2.38
0.0006856 Eth
$3,147,661.00
1,291,455.446 MASK
7.7127%
4
OKX
MASK-USDT$2.39
0.0006862 Eth
$3,057,514.00
1,257,254.394 MASK
7.5084%
5
Toobit
MASK-USDT$2.39
0.0006861 Eth
$2,992,112.00
1,228,076.290 MASK
7.3342%
6
Binance
MASK-USDT$2.38
0.0006857 Eth
$2,702,504.00
1,111,660.100 MASK
6.6389%
7
Bitrue
MASK-USDT$2.38
0.0006856 Eth
$2,522,094.00
1,058,166.000 MASK
6.3195%
8
WhiteBIT
MASK-USDT$2.39
0.0006864 Eth
$2,485,214.00
1,041,425.199 MASK
6.2195%
9
BloFin
MASK-USDT$2.39
0.0006869 Eth
$1,508,360.00
619,150.100 MASK
3.6976%
10
Bitget
MASK-USDT$2.38
0.0006857 Eth
$1,320,349.00
541,452.674 MASK
3.2336%
11
Upbit
MASK-KRW$2.41
0.0006930 Eth
$1,065,183.00
442,138.818 MASK
2.6405%
12
Trubit
MASK-USDT$2.38
0.0006857 Eth
$849,507.00
349,038.500 MASK
2.0845%
13
Bybit
MASK-USDT$2.39
0.0006864 Eth
$590,796.00
242,579.350 MASK
1.4487%
14
Kraken
MASK-USD$2.39
0.0006875 Eth
$528,755.00
221,236.506 MASK
1.3212%
15
KuCoin
MASK-USDT$2.39
0.0006862 Eth
$512,182.00
214,701.085 MASK
1.2822%
16
Websea
MASK-USDT$2.38
0.0006859 Eth
$424,960.00
0.000 MASK
0.0000%
17
Deepcoin
MASK-USDT$2.39
0.0006861 Eth
$395,640.00
160,750.000 MASK
0.9600%
18
LBank
MASK-USDT$2.39
0.0006856 Eth
$317,169.00
132,967.610 MASK
0.7941%
19
DigiFinex
MASK-USDT$2.38
0.0006858 Eth
$296,722.00
124,450.543 MASK
0.7432%
20
Hotcoin
MASK-USDT$2.38
0.0006853 Eth
$248,334.00
104,153.600 MASK
0.6220%
21
Bitunix
MASK-USDT$2.38
0.0006852 Eth
$214,511.00
89,961.110 MASK
0.5373%
22
BitDelta
MASK-USDT$2.38
0.0006857 Eth
$192,901.00
79,087.600 MASK
0.4723%
23
HitBTC
MASK-USDT$2.38
0.0006858 Eth
$187,740.00
77,747.660 MASK
0.4643%
24
FMFW.io
MASK-USDT$2.38
0.0006852 Eth
$185,368.00
77,747.660 MASK
0.4643%
25
Gate.io
MASK-USDT$2.38
0.0006855 Eth
$176,818.00
72,764.920 MASK
0.4346%
26
Coinbase Exchange
MASK-USD$2.40
0.0006900 Eth
$169,005.00
70,418.880 MASK
0.4205%
27
FameEX
MASK-USDT$2.39
0.0006858 Eth
$166,875.00
68,628.100 MASK
0.4099%
28
Icrypex
MASK-USDT$2.38
0.0006829 Eth
$164,624.00
69,301.270 MASK
0.4139%
29
Tapbit
MASK-USDT$2.38
0.0006852 Eth
$153,476.00
62,998.500 MASK
0.3762%
30
OrangeX
MASK-USDT$2.39
0.0006866 Eth
$147,313.00
60,447.500 MASK
0.3610%
31
AscendEX (BitMax)
MASK-USDT$2.39
0.0006873 Eth
$138,258.00
57,861.500 MASK
0.3456%
32
Phemex
MASK-USDT$2.39
0.0006863 Eth
$127,741.00
53,509.318 MASK
0.3196%
33
Icrypex
MASK-TRY$2.40
0.0006901 Eth
$110,732.00
46,127.741 MASK
0.2755%
34
BitMart
MASK-USDT$2.39
0.0006867 Eth
$95,397.00
39,942.020 MASK
0.2385%
35
ProBit Global
MASK-USDT$2.38
0.0006855 Eth
$92,274.00
38,697.641 MASK
0.2311%
36
bitcastle
MASK-USDT$2.39
0.0006861 Eth
$80,823.00
33,258.300 MASK
0.1986%
37
Kraken
MASK-EUR$2.43
0.0006976 Eth
$75,879.00
31,285.839 MASK
0.1868%
38
BingX
MASK-USDT$2.39
0.0006861 Eth
$75,064.00
30,821.670 MASK
0.1841%
39
Bit2Me
MASK-EUR$2.43
0.0006973 Eth
$74,311.00
30,660.122 MASK
0.1831%
40
Dex-Trade
MASK-USDT$2.38
0.0006851 Eth
$74,082.00
31,103.900 MASK
0.1858%
41
Bithumb
MASK-KRW$2.41
0.0006943 Eth
$72,535.00
30,035.969 MASK
0.1794%
42
LATOKEN
MASK-USDT$2.38
0.0006853 Eth
$57,237.00
24,005.588 MASK
0.1434%
43
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.40
0.0006905 Eth
$54,997.00
22,823.410 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1363%
44
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.39
0.0006870 Eth
$46,050.00
18,977.790 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1133%
45
CoinW
MASK-USDT$2.39
0.0006866 Eth
$39,385.00
16,490.896 MASK
0.0985%
46
MEXC
MASK-USDT$2.38
0.0006859 Eth
$30,441.00
12,766.610 MASK
0.0762%
47
Coinbase Exchange
MASK-EUR$2.39
0.0006860 Eth
$27,441.00
11,500.140 MASK
0.0687%
48
BtcTurk | Kripto
MASK-TRY$2.40
0.0006902 Eth
$26,078.00
10,867.500 MASK
0.0649%
49
Pionex
MASK-USDT$2.38
0.0006855 Eth
$22,425.00
9,229.674 MASK
0.0551%
50
Websea
MASK-BTC$2.38
0.0006858 Eth
$20,943.00
0.000 MASK
0.0000%
51
BTSE
MASK-USDT$2.38
0.0006853 Eth
$20,284.00
8,515.694 MASK
0.0509%
52
Cryptology
MASK-USDT$2.38
0.0006854 Eth
$18,939.68
7,944.200 MASK
0.0474%
53
Koinpark
MASK-USDT$2.39
0.0006874 Eth
$18,536.43
7,763.477 MASK
0.0464%
54
Bitvavo
MASK-EUR$2.41
0.0006931 Eth
$16,855.75
6,991.942 MASK
0.0418%
55
Binance
MASK-TRY$2.40
0.0006904 Eth
$15,839.54
6,449.600 MASK
0.0385%
56
Kanga
MASK-USDT$2.38
0.0006853 Eth
$15,674.37
0.000 MASK
0.0000%
57
Bitci TR
MASK-TRY$2.38
0.0006850 Eth
$15,118.92
6,169.112 MASK
0.0368%
58
Coinbase Exchange
MASK-USDT$2.39
0.0006873 Eth
$14,232.76
5,953.910 MASK
0.0356%
59
Bitlo
MASK-TRY$2.40
0.0006912 Eth
$13,235.31
5,394.713 MASK
0.0322%
60
Paribu
MASK-TRY$2.41
0.0006929 Eth
$11,564.20
4,799.020 MASK
0.0287%
61
Binance
MASK-BNB$2.39
0.0006870 Eth
$10,955.90
4,539.400 MASK
0.0271%
62
Crypto.com Exchange
MASK-USDT$2.38
0.0006857 Eth
$9,646.35
4,046.700 MASK
0.0242%
63
CEX.IO
MASK-USDT$2.39
0.0006861 Eth
$8,862.87
3,633.046 MASK
0.0217%
64
BtcTurk | Kripto
MASK-USDT$2.39
0.0006887 Eth
$7,516.31
3,139.040 MASK
0.0187%
65
CEX.IO
MASK-USD$2.39
0.0006860 Eth
$6,406.05
2,633.860 MASK
0.0157%
66
CoinEx
MASK-USDT$2.38
0.0006851 Eth
$6,256.48
2,570.605 MASK
0.0154%
67
WEEX
MASK-USDT$2.38
0.0006854 Eth
$5,794.75
2,381.900 MASK
0.0142%
68
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.46
0.0007088 Eth
$5,511.89
2,299.123 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0137%
69
OKX
MASK-USDC$2.40
0.0006903 Eth
$4,022.98
1,658.957 MASK
0.0099%
70
Crypto.com Exchange
MASK-USD$2.39
0.0006864 Eth
$3,850.85
1,613.800 MASK
0.0096%
71
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.46
0.0007089 Eth
$3,201.57
665.996 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0040%
72
Bitbank
MASK-JPY$2.40
0.0006902 Eth
$2,648.64
1,103.281 MASK
0.0066%
73
Mudrex
MASK-USDT$2.38
0.0006852 Eth
$2,036.00
854.209 MASK
0.0051%
74
Coinbase Exchange
MASK-GBP$2.41
0.0006925 Eth
$1,993.12
827.480 MASK
0.0049%
75
Gate.io
MASK-TRY$2.42
0.0006963 Eth
$1,096.53
446.338 MASK
0.0027%
76
Dex-Trade
MASK-BNB$2.39
0.0006865 Eth
$1,074.72
450.300 MASK
0.0027%
77
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.46
0.0007088 Eth
$1,016.60
418.970 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0025%
78
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.42
0.0006967 Eth
$926.55
376.737 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0022%
79
Max Maicoin
MASK-USDT$2.41
0.0006939 Eth
$749.80
310.700 MASK
0.0019%
80
Gemini
MASK-USD$2.40
0.0006895 Eth
$488.95
203.985 MASK
0.0012%
81
Upbit
MASK-BTC$2.39
0.0006884 Eth
$426.96
178.407 MASK
0.0011%
82
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.45
0.0007050 Eth
$329.77
134.550 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0008%
83
Binance US
MASK-USDT$2.39
0.0006879 Eth
$286.09
119.630 MASK
0.0007%
84
Indodax
MASK-IDR$2.43
0.0006997 Eth
$275.32
113.083 MASK
0.0007%
85
OKCoin Japan
MASK-JPY$2.41
0.0006931 Eth
$257.17
105.304 MASK
0.0006%
86
Nominex
MASK-USDT$2.39
0.0006888 Eth
$116.02
48.481 MASK
0.0003%
87
TokoCrypto
MASK-BNB$2.45
0.0007009 Eth
$105.58
43.150 MASK
0.0003%
88
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7$2.46
0.0006947 Eth
$60.00
24.413 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0001%
89
ChangeNOW
MASK-BTC$2.44
0.0007154 Eth
$59.35
24.538 MASK
0.0001%
90
Sushiswap
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.43
0.0006979 Eth
$33.78
13.889 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0001%
91
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.41
0.0006946 Eth
$33.58
13.785 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
92
TokoCrypto
MASK-USDT$2.38
0.0006852 Eth
$21.66
9.089 MASK
0.0001%
93
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.46
0.0007088 Eth
$16.95
6.830 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
94
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.44
0.0007026 Eth
$15.20
6.221 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
95
Nominex
MASK-TRY$2.40
0.0006904 Eth
$12.85
5.358 MASK
0.0000%
96
Poloniex
MASK-USDT$2.80
0.0008028 Eth
$12.20
4.448 MASK
0.0000%
97
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.45
0.0007009 Eth
$9.80
4.000 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0000%
98
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$2.41
0.0006932 Eth
$2.47
1.026 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
MaskToken

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license, Audited

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

Contract ABI

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Swarm Source

ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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