ETH Price: $2,650.79 (+0.54%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

14,119 ( -0.014%)

Market

Price

$2.28 @ 0.000860 ETH (-0.34%)

Onchain Market Cap

$228,000,000.00

Circulating Supply Market Cap

$227,717,608.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.01 MASK

Value
$0.02 ( ~7.54490779579168E-06 Eth) [0.0000%]
0x157a1fc38f1a0d3128acf456d58441774294b841
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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):$36,577,411.00
Market Capitalization:$227,717,608.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$2.28
0.0008601 Eth
$22,176,486.00
9,708,195.100 MASK
60.8308%
2
HTX
MASK-USDT$2.28
0.0008588 Eth
$1,439,802.00
631,069.620 MASK
3.9542%
3
Bitget
MASK-USDT$2.28
0.0008599 Eth
$1,377,100.00
603,214.483 MASK
3.7797%
4
Binance
MASK-USDT$2.28
0.0008587 Eth
$1,272,361.00
556,937.200 MASK
3.4897%
5
Nami.Exchange
MASK-VNST$2.29
0.0008654 Eth
$1,085,521.00
473,611.500 MASK
2.9676%
6
Bitrue
MASK-USDT$2.28
0.0008599 Eth
$1,080,678.00
474,532.600 MASK
2.9734%
7
Nami.Exchange
MASK-USDT$2.28
0.0008600 Eth
$1,073,412.00
471,299.000 MASK
2.9531%
8
Upbit
MASK-KRW$2.27
0.0008570 Eth
$844,506.00
371,900.085 MASK
2.3303%
9
Biconomy.com
MASK-USDT$2.28
0.0008601 Eth
$686,976.00
300,975.136 MASK
1.8859%
10
OKX
MASK-USDT$2.28
0.0008604 Eth
$612,481.00
268,266.300 MASK
1.6809%
11
WhiteBIT
MASK-USDT$2.28
0.0008603 Eth
$536,830.00
235,618.205 MASK
1.4764%
12
Byte Exchange
MASK-USDT$2.27
0.0008585 Eth
$517,150.00
227,469.211 MASK
1.4253%
13
Trubit
MASK-USDT$2.28
0.0008599 Eth
$510,005.00
224,072.700 MASK
1.4040%
14
Bibox
MASK-USDT$2.29
0.0008638 Eth
$395,361.00
172,789.000 MASK
1.0827%
15
Bybit
MASK-USDT$2.28
0.0008603 Eth
$338,884.00
149,410.030 MASK
0.9362%
16
Deepcoin
MASK-USDT$2.28
0.0008603 Eth
$316,639.00
138,465.059 MASK
0.8676%
17
BYDFi
MASK-USDT$2.28
0.0008600 Eth
$223,028.00
97,926.600 MASK
0.6136%
18
Websea
MASK-USDT$2.28
0.0008603 Eth
$216,041.00
0.000 MASK
0.0000%
19
Coinbase Exchange
MASK-USD$2.27
0.0008572 Eth
$197,963.00
87,208.230 MASK
0.5464%
20
Toobit
MASK-USDT$2.28
0.0008605 Eth
$181,783.00
79,602.010 MASK
0.4988%
21
Hotcoin
MASK-USDT$2.28
0.0008596 Eth
$180,472.00
79,273.500 MASK
0.4967%
22
LBank
MASK-USDT$2.27
0.0008588 Eth
$160,727.00
70,727.080 MASK
0.4432%
23
Icrypex
MASK-USDT$2.30
0.0008679 Eth
$156,479.00
68,076.289 MASK
0.4266%
24
BitDelta
MASK-USDT$2.28
0.0008600 Eth
$150,903.00
66,120.500 MASK
0.4143%
25
AscendEX (BitMax)
MASK-USDT$2.27
0.0008578 Eth
$136,979.00
60,267.800 MASK
0.3776%
26
FMFW.io
MASK-USDT$2.28
0.0008605 Eth
$132,213.00
58,014.100 MASK
0.3635%
27
Bitunix
MASK-USDT$2.28
0.0008598 Eth
$129,945.00
57,063.310 MASK
0.3576%
28
HitBTC
MASK-USDT$2.28
0.0008603 Eth
$128,562.00
56,313.130 MASK
0.3529%
29
BIT
MASK-USDT$2.28
0.0008605 Eth
$119,417.00
52,379.303 MASK
0.3282%
30
Gate.io
MASK-USDT$2.28
0.0008603 Eth
$104,941.00
45,971.150 MASK
0.2881%
31
Icrypex
MASK-TRY$2.29
0.0008642 Eth
$104,439.00
45,624.264 MASK
0.2859%
32
BtcTurk | Kripto
MASK-TRY$2.28
0.0008624 Eth
$98,019.00
42,907.400 MASK
0.2689%
33
BTSE
MASK-USDT$2.28
0.0008599 Eth
$87,208.00
38,298.076 MASK
0.2400%
34
DigiFinex
MASK-USDT$2.28
0.0008598 Eth
$86,242.00
37,864.941 MASK
0.2373%
35
ProBit Global
MASK-USDT$2.28
0.0008600 Eth
$83,078.00
36,476.258 MASK
0.2286%
36
BitMart
MASK-USDT$2.28
0.0008600 Eth
$81,337.00
35,710.340 MASK
0.2238%
37
Bithumb
MASK-KRW$2.26
0.0008552 Eth
$80,889.00
35,713.554 MASK
0.2238%
38
FameEX
MASK-USDT$2.28
0.0008602 Eth
$79,790.00
34,934.400 MASK
0.2189%
39
Phemex
MASK-USDT$2.28
0.0008600 Eth
$64,248.00
28,209.621 MASK
0.1768%
40
Tapbit
MASK-USDT$2.28
0.0008599 Eth
$62,635.00
27,446.500 MASK
0.1720%
41
OrangeX
MASK-USDT$2.28
0.0008599 Eth
$59,781.00
26,158.290 MASK
0.1639%
42
LATOKEN
MASK-USDT$2.28
0.0008607 Eth
$58,104.00
25,485.959 MASK
0.1597%
43
MEXC
MASK-USDT$2.28
0.0008603 Eth
$56,872.00
24,955.590 MASK
0.1564%
44
BingX
MASK-USDT$2.28
0.0008593 Eth
$53,925.00
23,628.630 MASK
0.1481%
45
Dex-Trade
MASK-USDT$2.28
0.0008608 Eth
$43,579.00
19,117.100 MASK
0.1198%
46
KuCoin
MASK-USDT$2.28
0.0008595 Eth
$42,431.00
18,636.607 MASK
0.1168%
47
BloFin
MASK-USDT$2.28
0.0008596 Eth
$40,923.00
17,924.200 MASK
0.1123%
48
bitcastle
MASK-USDT$2.28
0.0008600 Eth
$39,056.00
17,106.500 MASK
0.1072%
49
Coinbase Exchange
MASK-EUR$2.27
0.0008580 Eth
$23,660.00
10,411.950 MASK
0.0652%
50
CoinW
MASK-USDT$2.28
0.0008600 Eth
$22,471.00
9,866.084 MASK
0.0618%
51
PointPay
MASK-USDT$2.28
0.0008605 Eth
$21,631.00
9,472.620 MASK
0.0594%
52
Cryptology
MASK-USDT$2.28
0.0008612 Eth
$18,378.06
8,057.800 MASK
0.0505%
53
BtcTurk | Kripto
MASK-USDT$2.27
0.0008577 Eth
$17,432.13
7,673.110 MASK
0.0481%
54
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.27
0.0008594 Eth
$15,922.57
6,975.348 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0437%
55
Binance
MASK-BNB$2.27
0.0008573 Eth
$14,793.87
6,498.800 MASK
0.0407%
56
Binance
MASK-TRY$2.27
0.0008582 Eth
$14,733.08
6,455.400 MASK
0.0404%
57
Kraken
MASK-USD$2.28
0.0008590 Eth
$13,566.28
5,963.200 MASK
0.0374%
58
Koinpark
MASK-USDT$2.28
0.0008605 Eth
$11,826.07
5,187.851 MASK
0.0325%
59
Pionex
MASK-USDT$2.28
0.0008604 Eth
$10,578.70
4,633.284 MASK
0.0290%
60
Bitci TR
MASK-TRY$2.29
0.0008665 Eth
$9,806.01
4,286.230 MASK
0.0269%
61
Bitvavo
MASK-EUR$2.28
0.0008606 Eth
$9,133.08
4,007.512 MASK
0.0251%
62
Kanga
MASK-USDT$2.28
0.0008615 Eth
$8,893.84
0.000 MASK
0.0000%
63
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.27
0.0008571 Eth
$7,767.65
3,391.636 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0213%
64
Bitbank
MASK-JPY$2.27
0.0008563 Eth
$7,689.72
3,391.060 MASK
0.0212%
65
Nominex
MASK-USDT$2.28
0.0008600 Eth
$7,406.54
3,252.014 MASK
0.0204%
66
OKX
MASK-USDC$2.28
0.0008610 Eth
$6,889.95
3,017.058 MASK
0.0189%
67
Paribu
MASK-TRY$2.28
0.0008591 Eth
$6,597.59
2,898.430 MASK
0.0182%
68
Bitlo
MASK-TRY$2.29
0.0008637 Eth
$6,493.05
2,837.591 MASK
0.0178%
69
Crypto.com Exchange
MASK-USDT$2.28
0.0008601 Eth
$5,224.93
2,292.700 MASK
0.0144%
70
Coinbase Exchange
MASK-USDT$2.27
0.0008569 Eth
$4,769.02
2,100.970 MASK
0.0132%
71
Vindax
MASK-USDT$2.26
0.0008546 Eth
$3,670.47
1,624.100 MASK
0.0102%
72
Crypto.com Exchange
MASK-USD$2.28
0.0008599 Eth
$2,768.15
1,214.900 MASK
0.0076%
73
WEEX
MASK-USDT$2.28
0.0008589 Eth
$1,969.11
862.600 MASK
0.0054%
74
Max Maicoin
MASK-USDT$2.26
0.0008525 Eth
$1,726.12
764.200 MASK
0.0048%
75
TokoCrypto
MASK-USDT$2.28
0.0008589 Eth
$1,282.14
563.425 MASK
0.0035%
76
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.27
0.0008603 Eth
$1,131.58
497.950 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0031%
77
Kraken
MASK-EUR$2.27
0.0008556 Eth
$933.69
412.072 MASK
0.0026%
78
Bit2Me
MASK-EUR$2.27
0.0008556 Eth
$919.40
403.830 MASK
0.0025%
79
Gemini
MASK-USD$2.27
0.0008575 Eth
$793.85
349.559 MASK
0.0022%
80
Mudrex
MASK-USDT$2.28
0.0008599 Eth
$614.08
269.618 MASK
0.0017%
81
Dex-Trade
MASK-BNB$2.29
0.0008640 Eth
$558.76
244.200 MASK
0.0015%
82
Upbit
MASK-BTC$2.29
0.0008655 Eth
$506.75
220.974 MASK
0.0014%
83
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.27
0.0008590 Eth
$396.62
174.009 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0011%
84
Indodax
MASK-IDR$2.26
0.0008547 Eth
$328.58
145.178 MASK
0.0009%
85
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.28
0.0008623 Eth
$318.87
139.638 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0009%
86
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7$2.27
0.0008587 Eth
$147.85
65.144 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0004%
87
Coinbase Exchange
MASK-GBP$2.27
0.0008580 Eth
$146.53
64.490 MASK
0.0004%
88
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.29
0.0008637 Eth
$94.60
41.593 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0003%
89
CoinDCX
MASK-INR$2.37
0.0008951 Eth
$91.88
0.000 MASK
0.0000%
90
Mercado Bitcoin
MASK-BRL$2.35
0.0008855 Eth
$69.08
29.458 MASK
0.0002%
91
OKCoin Japan
MASK-JPY$2.31
0.0008711 Eth
$66.06
28.634 MASK
0.0002%
92
Bittime
MASK-IDR$2.28
0.0008617 Eth
$52.45
22.590 MASK
0.0001%
93
Nominex
MASK-BNB$2.28
0.0008618 Eth
$45.30
19.852 MASK
0.0001%
94
Gate.io
MASK-ETH$2.27
0.0008558 Eth
$43.65
19.200 MASK
0.0001%
95
CEX.IO
MASK-USDT$2.28
0.0008608 Eth
$38.01
16.648 MASK
0.0001%
96
CEX.IO
MASK-USD$2.28
0.0008613 Eth
$24.19
10.482 MASK
0.0001%
97
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.27
0.0008556 Eth
$9.40
4.102 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0000%
98
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.28
0.0008613 Eth
$2.66
1.168 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
99
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.28
0.0008590 Eth
$2.44
1.068 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
100
Gate.io
MASK-TRY$2.31
0.0008708 Eth
$1.087
0.471 MASK
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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