ETH Price: $2,487.82 (+3.26%)
 

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 MASK

Value
$2,411.85 ( ~0.969462870973085 Eth) [0.0008%]
0xA3222357a0eCCF60C73606170be6c99ADeCb59b3
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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):$519,260,713.00
Market Capitalization:$308,772,721.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# 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 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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