Overview
Max Total Supply
70,929,452,093.657795 USDT
Holders
6,464,157 ( 0.122%)
Market
Price
$1.00 @ 0.000274 ETH (-0.15%)
Onchain Market Cap
$70,842,492,585.39
Circulating Supply Market Cap
$133,957,716,533.00
Other Info
Token Contract (WITH 6 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Binance | BTC-USDT | $1.001 0.0002736 Eth | $3,070,045,620.00 31,812.348 BTC | 0.0000% |
2 | Pionex | BTC-USDT | $1.001 0.0002729 Eth | $2,636,825,508.00 27,316.351 BTC | 0.0000% |
3 | BVOX | BTC-USDT | $1.001 0.0002738 Eth | $2,327,735,413.00 24,118.080 BTC | 0.0000% |
4 | Crypto.com Exchange | ETH-USDT | $1.001 0.0002736 Eth | $2,211,637,384.00 604,343.450 ETH | 0.0000% |
5 | CoinW | BTC-USDT | $1.001 0.0002738 Eth | $2,056,341,916.00 21,206.727 BTC | 0.0000% |
6 | Pionex | ETH-USDT | $1.001 0.0002719 Eth | $1,880,875,570.00 512,317.381 ETH | 0.0000% |
7 | Ourbit | BTC-USDT | $1.00 0.0002723 Eth | $1,831,392,531.00 18,990.869 BTC | 0.0000% |
8 | Bybit | XRP-USDT | $1.001 0.0002736 Eth | $1,732,173,886.00 730,576,944.290 XRP | 0.0024% |
9 | Toobit | BTC-USDT | $1.001 0.0002738 Eth | $1,718,005,209.00 17,793.123 BTC | 0.0000% |
10 | WEEX | BTC-USDT | $1.00 0.0002730 Eth | $1,630,550,662.00 16,917.035 BTC | 0.0000% |
11 | MEXC | BTC-USDT | $1.001 0.0002736 Eth | $1,616,051,121.00 16,664.314 BTC | 0.0000% |
12 | DigiFinex | BTC-USDT | $1.001 0.0002736 Eth | $1,249,142,745.00 12,887.722 BTC | 0.0000% |
13 | WhiteBIT | XRP-USDT | $1.001 0.0002730 Eth | $1,196,082,405.00 422,229,425.320 XRP | 0.0014% |
14 | Binance | SOL-USDT | $1.001 0.0002736 Eth | $1,177,499,358.00 5,122,537.538 SOL | 0.0000% |
15 | WhiteBIT | BTC-USDT | $1.001 0.0002724 Eth | $1,153,359,503.00 11,878.836 BTC | 0.0000% |
16 | OKX | XRP-USDT | $1.001 0.0002737 Eth | $1,135,408,368.00 478,994,713.368 XRP | 0.0016% |
17 | BVOX | ETH-USDT | $1.001 0.0002723 Eth | $1,126,136,133.00 306,965.185 ETH | 0.0000% |
18 | WEEX | ETH-USDT | $1.001 0.0002736 Eth | $1,100,779,492.00 300,124.091 ETH | 0.0000% |
19 | MEXC | XRP-USDT | $1.001 0.0002734 Eth | $1,061,302,547.00 370,892,254.440 XRP | 0.0012% |
20 | LBank | BTC-USDT | $1.001 0.0002727 Eth | $1,032,192,403.00 10,636.669 BTC | 0.0000% |
21 | Gate.io | XRP-USDT | $1.001 0.0002737 Eth | $1,031,765,747.00 442,285,714.974 XRP | 0.0015% |
22 | BitMart | BTC-USDT | $1.001 0.0002733 Eth | $1,017,330,689.00 10,462.575 BTC | 0.0000% |
23 | BitMart | ETH-USDT | $1.001 0.0002733 Eth | $1,016,746,073.00 277,232.333 ETH | 0.0000% |
24 | Binance | FDUSD-USDT | $1.001 0.0002719 Eth | $1,016,653,722.00 1,018,173,021.000 FDUSD | 0.0033% |
25 | CoinW | ETH-USDT | $1.001 0.0002738 Eth | $983,264,051.00 268,718.089 ETH | 0.0000% |
26 | Hotcoin | BTC-USDT | $1.001 0.0002729 Eth | $982,568,075.00 10,117.220 BTC | 0.0000% |
27 | Bitunix | XRP-USDT | $1.001 0.0002736 Eth | $960,049,301.00 336,413,625.000 XRP | 0.0011% |
28 | AscendEX (BitMax) | BTC-USDT | $1.001 0.0002736 Eth | $941,131,509.00 9,710.061 BTC | 0.0000% |
29 | DigiFinex | ETH-USDT | $1.001 0.0002736 Eth | $893,639,762.00 244,529.684 ETH | 0.0000% |
30 | OKX | DOGE-USDT | $1.001 0.0002737 Eth | $882,635,428.00 2,041,796,749.502 DOGE | 0.0067% |
31 | Bitunix | BTC-USDT | $1.001 0.0002736 Eth | $843,729,760.00 8,702.485 BTC | 0.0000% |
32 | Bitget | BTC-USDT | $1.001 0.0002736 Eth | $817,221,047.00 8,474.450 BTC | 0.0000% |
33 | OKX | BTC-USDT | $1.001 0.0002736 Eth | $815,675,278.00 8,457.853 BTC | 0.0000% |
34 | Deepcoin | BTC-USDT | $1.001 0.0002736 Eth | $799,556,679.00 8,304.851 BTC | 0.0000% |
35 | Ourbit | ETH-USDT | $1.001 0.0002719 Eth | $789,959,449.00 215,240.156 ETH | 0.0000% |
36 | Binance | HBAR-USDT | $1.00 0.0002719 Eth | $768,813,328.00 3,225,327,875.000 HBAR | 0.0106% |
37 | Bybit | ETH-USDT | $1.001 0.0002736 Eth | $741,567,712.00 201,973.969 ETH | 0.0000% |
38 | P2B | BTC-USDT | $1.001 0.0002737 Eth | $730,092,898.00 7,529.990 BTC | 0.0000% |
39 | Binance | SHIB-USDT | $1.001 0.0002721 Eth | $706,627,417.00 23,131,613,538,729.000 SHIB | 75.8670% |
40 | OKX | ETH-USDT | $1.001 0.0002737 Eth | $697,016,020.00 189,971.831 ETH | 0.0000% |
41 | XT.COM | ETH-USDT | $1.001 0.0002724 Eth | $696,542,254.00 189,947.891 ETH | 0.0000% |
42 | MEXC | ETH-USDT | $1.001 0.0002736 Eth | $695,783,122.00 190,153.145 ETH | 0.0000% |
43 | XT.COM | BTC-USDT | $1.001 0.0002722 Eth | $681,038,129.00 7,058.410 BTC | 0.0000% |
44 | Hotcoin | ETH-USDT | $1.001 0.0002725 Eth | $653,962,443.00 178,154.326 ETH | 0.0000% |
45 | Bitunix | ETH-USDT | $1.001 0.0002736 Eth | $566,790,478.00 154,973.176 ETH | 0.0000% |
46 | Coinbase Exchange | USDT-USD | $1.001 0.0002736 Eth | $521,625,656.00 521,312,867.880 USDT | 0.0017% |
47 | Bitget | DOGE-USDT | $1.001 0.0002736 Eth | $518,228,748.00 1,197,964,116.028 DOGE | 0.0039% |
48 | Binance | AVAX-USDT | $1.001 0.0002721 Eth | $506,267,902.00 10,681,223.940 AVAX | 0.0000% |
49 | Binance | LTC-USDT | $1.001 0.0002736 Eth | $469,174,469.00 3,902,272.082 LTC | 0.0000% |
50 | MEXC | DOGE-USDT | $0.9997 0.0002735 Eth | $467,898,645.00 1,082,199,310.410 DOGE | 0.0035% |
51 | BTC-Alpha | BTC-USDT | $0.9997 0.0002735 Eth | $465,390,640.00 4,807.031 BTC | 0.0000% |
52 | Binance | BNB-USDT | $1.001 0.0002736 Eth | $461,651,797.00 712,581.456 BNB | 0.0000% |
53 | LATOKEN | BTC-USDT | $1.001 0.0002736 Eth | $420,738,438.00 4,341.138 BTC | 0.0000% |
54 | Binance | PNUT-USDT | $1.001 0.0002736 Eth | $407,139,755.00 341,900,672.800 PNUT | 0.0011% |
55 | LATOKEN | ETH-USDT | $1.001 0.0002730 Eth | $403,297,996.00 110,175.684 ETH | 0.0000% |
56 | HTX | BTC-USDT | $0.9997 0.0002735 Eth | $380,119,608.00 3,943.202 BTC | 0.0000% |
57 | Bitunix | DOGE-USDT | $1.001 0.0002736 Eth | $370,555,372.00 856,735,442.000 DOGE | 0.0028% |
58 | BigONE | BTC-USDT | $1.001 0.0002722 Eth | $366,480,454.00 3,773.785 BTC | 0.0000% |
59 | Bybit | DOGE-USDT | $1.001 0.0002736 Eth | $365,857,110.00 845,351,564.500 DOGE | 0.0028% |
60 | WhiteBIT | LTC-USDT | $1.001 0.0002734 Eth | $347,952,573.00 2,875,703.984 LTC | 0.0000% |
61 | BTSE | BTC-USDT | $1.001 0.0002735 Eth | $326,830,722.00 3,372.131 BTC | 0.0000% |
62 | Bybit | SOL-USDT | $1.001 0.0002736 Eth | $322,624,042.00 1,406,033.066 SOL | 0.0000% |
63 | Binance | NEIRO-USDT | $1.001 0.0002736 Eth | $300,172,217.00 155,509,082,365.000 NEIRO | 0.5100% |
64 | OrangeX | ETH-USDT | $1.001 0.0002734 Eth | $294,532,783.00 80,181.955 ETH | 0.0000% |
65 | OKX | SOL-USDT | $1.001 0.0002737 Eth | $286,394,679.00 1,246,081.440 SOL | 0.0000% |
66 | DigiFinex | DOGE-USDT | $1.001 0.0002736 Eth | $285,513,526.00 660,226,925.160 DOGE | 0.0022% |
67 | Coinstore | BTC-USDT | $1.001 0.0002737 Eth | $283,657,399.00 2,941.830 BTC | 0.0000% |
68 | Biconomy.com | BTC-USDT | $1.001 0.0002721 Eth | $272,191,352.00 2,819.999 BTC | 0.0000% |
69 | Biconomy.com | ETH-USDT | $1.001 0.0002735 Eth | $255,467,174.00 69,597.497 ETH | 0.0000% |
70 | Gate.io | ETH-USDT | $1.001 0.0002738 Eth | $241,968,277.00 66,015.723 ETH | 0.0000% |
71 | OrangeX | XRP-USDT | $1.001 0.0002736 Eth | $237,752,523.00 101,402,672.000 XRP | 0.0003% |
72 | Kraken | USDT-USD | $1.001 0.0002736 Eth | $237,208,175.00 237,042,245.877 USDT | 0.0008% |
73 | Binance | SUI-USDT | $1.001 0.0002721 Eth | $232,537,591.00 69,572,574.300 SUI | 0.0002% |
74 | WEEX | DOGE-USDT | $1.00 0.0002730 Eth | $231,312,708.00 532,543,471.817 DOGE | 0.0017% |
75 | Gate.io | BTC-USDT | $1.001 0.0002737 Eth | $228,842,392.00 2,373.604 BTC | 0.0000% |
76 | Deepcoin | SOL-USDT | $1.001 0.0002736 Eth | $225,639,212.00 980,607.588 SOL | 0.0000% |
77 | WhiteBIT | AVAX-USDT | $1.001 0.0002730 Eth | $220,349,975.00 4,458,135.483 AVAX | 0.0000% |
78 | Toobit | DOGE-USDT | $0.9997 0.0002735 Eth | $219,822,349.00 508,877,709.000 DOGE | 0.0017% |
79 | WhiteBIT | SOL-USDT | $1.001 0.0002737 Eth | $211,510,443.00 930,952.916 SOL | 0.0000% |
80 | Binance | DOT-USDT | $1.001 0.0002725 Eth | $205,660,307.00 22,780,670.970 DOT | 0.0001% |
81 | WhiteBIT | LINK-USDT | $1.001 0.0002718 Eth | $204,028,893.00 9,407,672.650 LINK | 0.0000% |
82 | HTX | ETH-USDT | $0.9997 0.0002735 Eth | $194,492,021.00 53,080.881 ETH | 0.0000% |
83 | Deepcoin | DOGE-USDT | $1.00 0.0002723 Eth | $185,697,760.00 434,007,190.893 DOGE | 0.0014% |
84 | LBank | SOL-USDT | $1.001 0.0002736 Eth | $185,482,407.00 816,325.101 SOL | 0.0000% |
85 | Gate.io | ADA-USDT | $1.001 0.0002737 Eth | $168,266,537.00 147,975,007.625 ADA | 0.0005% |
86 | Slex | BTC-USDT | $1.001 0.0002738 Eth | $157,682,321.00 1,627.884 BTC | 0.0000% |
87 | LBank | DOGE-USDT | $1.001 0.0002727 Eth | $157,475,196.00 365,483,425.000 DOGE | 0.0012% |
88 | Binance | ARB-USDT | $1.003 0.0002725 Eth | $155,770,688.00 163,475,422.900 ARB | 0.0005% |
89 | WEEX | SOL-USDT | $1.001 0.0002734 Eth | $152,827,047.00 664,440.077 SOL | 0.0000% |
90 | DigiFinex | ADA-USDT | $1.001 0.0002736 Eth | $151,134,295.00 121,945,160.000 ADA | 0.0004% |
91 | Bitunix | SOL-USDT | $1.001 0.0002736 Eth | $150,001,762.00 660,075.957 SOL | 0.0000% |
92 | Binance | FLOKI-USDT | $1.001 0.0002719 Eth | $145,448,011.00 621,148,843,078.000 FLOKI | 2.0372% |
93 | XT.COM | DOGE-USDT | $1.001 0.0002736 Eth | $140,588,786.00 325,522,577.000 DOGE | 0.0011% |
94 | OKX | PEPE-USDT | $1.001 0.0002736 Eth | $138,778,343.00 6,551,625,388,201.000 PEPE | 21.4880% |
95 | Binance | AAVE-USDT | $1.001 0.0002736 Eth | $133,057,468.00 611,264.430 AAVE | 0.0000% |
96 | Gate.io | SOL-USDT | $1.001 0.0002737 Eth | $126,763,288.00 550,868.406 SOL | 0.0000% |
97 | Binance | ENA-USDT | $1.001 0.0002736 Eth | $121,556,976.00 144,854,371.590 ENA | 0.0005% |
98 | BYDFi | BTC-USDT | $1.001 0.0002727 Eth | $121,348,464.00 1,250.343 BTC | 0.0000% |
99 | WhiteBIT | TRX-USDT | $1.001 0.0002735 Eth | $109,272,127.00 514,349,110.060 TRX | 0.0017% |
100 | Binance | BOME-USDT | $1.001 0.0002721 Eth | $106,282,538.00 11,548,500,280.000 BOME | 0.0379% |
Contract Name:
TetherToken
Compiler Version
v0.4.18+commit.9cf6e910
Optimization Enabled:
No with 0 runs
Other Settings:
default evmVersion, Audited
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2017-11-28 */ pragma solidity ^0.4.17; /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() public { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { if (newOwner != address(0)) { owner = newOwner; } } } /** * @title ERC20Basic * @dev Simpler version of ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20Basic { uint public _totalSupply; function totalSupply() public constant returns (uint); function balanceOf(address who) public constant returns (uint); function transfer(address to, uint value) public; event Transfer(address indexed from, address indexed to, uint value); } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public constant returns (uint); function transferFrom(address from, address to, uint value) public; function approve(address spender, uint value) public; event Approval(address indexed owner, address indexed spender, uint value); } /** * @title Basic token * @dev Basic version of StandardToken, with no allowances. */ contract BasicToken is Ownable, ERC20Basic { using SafeMath for uint; mapping(address => uint) public balances; // additional variables for use if transaction fees ever became necessary uint public basisPointsRate = 0; uint public maximumFee = 0; /** * @dev Fix for the ERC20 short address attack. */ modifier onlyPayloadSize(uint size) { require(!(msg.data.length < size + 4)); _; } /** * @dev transfer token for a specified address * @param _to The address to transfer to. * @param _value The amount to be transferred. */ function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) { uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } uint sendAmount = _value.sub(fee); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(msg.sender, owner, fee); } Transfer(msg.sender, _to, sendAmount); } /** * @dev Gets the balance of the specified address. * @param _owner The address to query the the balance of. * @return An uint representing the amount owned by the passed address. */ function balanceOf(address _owner) public constant returns (uint balance) { return balances[_owner]; } } /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * @dev https://github.com/ethereum/EIPs/issues/20 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is BasicToken, ERC20 { mapping (address => mapping (address => uint)) public allowed; uint public constant MAX_UINT = 2**256 - 1; /** * @dev Transfer tokens from one address to another * @param _from address The address which you want to send tokens from * @param _to address The address which you want to transfer to * @param _value uint the amount of tokens to be transferred */ function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) { var _allowance = allowed[_from][msg.sender]; // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met // if (_value > _allowance) throw; uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } if (_allowance < MAX_UINT) { allowed[_from][msg.sender] = _allowance.sub(_value); } uint sendAmount = _value.sub(fee); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(_from, owner, fee); } Transfer(_from, _to, sendAmount); } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * @param _spender The address which will spend the funds. * @param _value The amount of tokens to be spent. */ function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { // To change the approve amount you first have to reduce the addresses` // allowance to zero by calling `approve(_spender, 0)` if it is not // already 0 to mitigate the race condition described here: // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 require(!((_value != 0) && (allowed[msg.sender][_spender] != 0))); allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); } /** * @dev Function to check the amount of tokens than an owner allowed to a spender. * @param _owner address The address which owns the funds. * @param _spender address The address which will spend the funds. * @return A uint specifying the amount of tokens still available for the spender. */ function allowance(address _owner, address _spender) public constant returns (uint remaining) { return allowed[_owner][_spender]; } } /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause(); bool public paused = false; /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused public { paused = true; Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; Unpause(); } } contract BlackList is Ownable, BasicToken { /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) /////// function getBlackListStatus(address _maker) external constant returns (bool) { return isBlackListed[_maker]; } function getOwner() external constant returns (address) { return owner; } mapping (address => bool) public isBlackListed; function addBlackList (address _evilUser) public onlyOwner { isBlackListed[_evilUser] = true; AddedBlackList(_evilUser); } function removeBlackList (address _clearedUser) public onlyOwner { isBlackListed[_clearedUser] = false; RemovedBlackList(_clearedUser); } function destroyBlackFunds (address _blackListedUser) public onlyOwner { require(isBlackListed[_blackListedUser]); uint dirtyFunds = balanceOf(_blackListedUser); balances[_blackListedUser] = 0; _totalSupply -= dirtyFunds; DestroyedBlackFunds(_blackListedUser, dirtyFunds); } event DestroyedBlackFunds(address _blackListedUser, uint _balance); event AddedBlackList(address _user); event RemovedBlackList(address _user); } contract UpgradedStandardToken is StandardToken{ // those methods are called by the legacy contract // and they must ensure msg.sender to be the contract address function transferByLegacy(address from, address to, uint value) public; function transferFromByLegacy(address sender, address from, address spender, uint value) public; function approveByLegacy(address from, address spender, uint value) public; } contract TetherToken is Pausable, StandardToken, BlackList { string public name; string public symbol; uint public decimals; address public upgradedAddress; bool public deprecated; // The contract can be initialized with a number of tokens // All the tokens are deposited to the owner address // // @param _balance Initial supply of the contract // @param _name Token Name // @param _symbol Token symbol // @param _decimals Token decimals function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public { _totalSupply = _initialSupply; name = _name; symbol = _symbol; decimals = _decimals; balances[owner] = _initialSupply; deprecated = false; } // Forward ERC20 methods to upgraded contract if this one is deprecated function transfer(address _to, uint _value) public whenNotPaused { require(!isBlackListed[msg.sender]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value); } else { return super.transfer(_to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function transferFrom(address _from, address _to, uint _value) public whenNotPaused { require(!isBlackListed[_from]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value); } else { return super.transferFrom(_from, _to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function balanceOf(address who) public constant returns (uint) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).balanceOf(who); } else { return super.balanceOf(who); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value); } else { return super.approve(_spender, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function allowance(address _owner, address _spender) public constant returns (uint remaining) { if (deprecated) { return StandardToken(upgradedAddress).allowance(_owner, _spender); } else { return super.allowance(_owner, _spender); } } // deprecate current contract in favour of a new one function deprecate(address _upgradedAddress) public onlyOwner { deprecated = true; upgradedAddress = _upgradedAddress; Deprecate(_upgradedAddress); } // deprecate current contract if favour of a new one function totalSupply() public constant returns (uint) { if (deprecated) { return StandardToken(upgradedAddress).totalSupply(); } else { return _totalSupply; } } // Issue a new amount of tokens // these tokens are deposited into the owner address // // @param _amount Number of tokens to be issued function issue(uint amount) public onlyOwner { require(_totalSupply + amount > _totalSupply); require(balances[owner] + amount > balances[owner]); balances[owner] += amount; _totalSupply += amount; Issue(amount); } // Redeem tokens. // These tokens are withdrawn from the owner address // if the balance must be enough to cover the redeem // or the call will fail. // @param _amount Number of tokens to be issued function redeem(uint amount) public onlyOwner { require(_totalSupply >= amount); require(balances[owner] >= amount); _totalSupply -= amount; balances[owner] -= amount; Redeem(amount); } function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner { // Ensure transparency by hardcoding limit beyond which fees can never be added require(newBasisPoints < 20); require(newMaxFee < 50); basisPointsRate = newBasisPoints; maximumFee = newMaxFee.mul(10**decimals); Params(basisPointsRate, maximumFee); } // Called when new token are issued event Issue(uint amount); // Called when tokens are redeemed event Redeem(uint amount); // Called when contract is deprecated event Deprecate(address newAddress); // Called if contract ever adds fees event Params(uint feeBasisPoints, uint maxFee); }
Contract Security Audit
- Callisto Network - July 10th, 2019 - Security Audit Report
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000174876e800000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a546574686572205553440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _initialSupply (uint256): 100000000000
Arg [1] : _name (string): Tether USD
Arg [2] : _symbol (string): USDT
Arg [3] : _decimals (uint256): 6
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000174876e800
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 5465746865722055534400000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553445400000000000000000000000000000000000000000000000000000000
Swarm Source
bzzr://645ee12d73db47fd78ba77fa1f824c3c8f9184061b3b10386beb4dc9236abb28
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