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Contract

0x8d4193fB3871c43c442EA17C6D9bb33d0644E81d
 

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0 ETH

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$0.00

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From
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Approve167723812023-03-06 22:50:11678 days ago1678143011IN
0x8d4193fB...d0644E81d
0 ETH0.0011276146.74038475
Approve127727802021-07-06 8:15:541287 days ago1625559354IN
0x8d4193fB...d0644E81d
0 ETH0.0018377939.6
Transfer104021272020-07-05 22:34:261652 days ago1593988466IN
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0 ETH0.0008500828
Approve104021272020-07-05 22:34:261652 days ago1593988466IN
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0 ETH0.0007089416
Approve103986672020-07-05 9:43:421653 days ago1593942222IN
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0 ETH0.0011963427
Approve103768642020-07-02 0:42:061656 days ago1593650526IN
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0 ETH0.0013292730
Approve103723672020-07-01 8:13:551657 days ago1593591235IN
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0 ETH0.0015951236
Transfer103618142020-06-29 16:33:081658 days ago1593448388IN
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0 ETH0.0023139751
Transfer103606162020-06-29 12:02:121658 days ago1593432132IN
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0 ETH0.0019958444
Transfer103601082020-06-29 10:06:501659 days ago1593425210IN
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0 ETH0.0018597641
Approve103593612020-06-29 7:18:571659 days ago1593415137IN
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0 ETH0.0015951236
Approve103568352020-06-28 21:55:361659 days ago1593381336IN
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0 ETH0.0015951236
Approve103542112020-06-28 12:23:001659 days ago1593346980IN
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0 ETH0.0017058938.5
Approve103540052020-06-28 11:39:081660 days ago1593344348IN
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0 ETH0.0013292730
Transfer103538522020-06-28 11:00:091660 days ago1593342009IN
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0 ETH0.001360830
Approve103538432020-06-28 10:57:261660 days ago1593341846IN
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0 ETH0.0013647130.8
Burn103535602020-06-28 9:57:151660 days ago1593338235IN
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0 ETH0.0009560927
Burn103535272020-06-28 9:50:181660 days ago1593337818IN
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0 ETH0.0010605330
Transfer103534912020-06-28 9:41:421660 days ago1593337302IN
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0 ETH0.001810830
Transfer103534902020-06-28 9:41:371660 days ago1593337297IN
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0 ETH0.001810830
Transfer103534852020-06-28 9:40:411660 days ago1593337241IN
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0 ETH0.001810830
Transfer103534822020-06-28 9:40:341660 days ago1593337234IN
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0 ETH0.001810830
Transfer103534822020-06-28 9:40:341660 days ago1593337234IN
0x8d4193fB...d0644E81d
0 ETH0.001810830
Transfer103534822020-06-28 9:40:341660 days ago1593337234IN
0x8d4193fB...d0644E81d
0 ETH0.001810830
Transfer103534542020-06-28 9:35:331660 days ago1593336933IN
0x8d4193fB...d0644E81d
0 ETH0.001810830
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Contract Source Code Verified (Exact Match)

Contract Name:
ULTRA

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
/**
 *Submitted for verification at Etherscan.io on 2020-06-27
*/

pragma solidity ^0.5.2;


interface IERC20 {
    function totalSupply() external view returns(uint256);
    function balanceOf(address who) external view returns(uint256);
    function allowance(address owner, address spender) external view returns(uint256);
    function transfer(address to, uint256 value) external returns(bool);
    function approve(address spender, uint256 value) external returns(bool);
    function transferFrom(address from, address to, uint256 value) external returns(bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

library SafeMath {

    function mul(uint256 a, uint256 b) internal pure returns(uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns(uint256) {
        require(b > 0);
        uint256 c = a / b;

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns(uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    function add(uint256 a, uint256 b) internal pure returns(uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    function ceil(uint256 a, uint256 m) internal pure returns(uint256) {
        uint256 c = add(a, m);
        uint256 d = sub(c, 1);
        return mul(div(d, m), m);
    }
}

contract ERC20Detailed is IERC20 {

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor(string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    function name() public view returns(string memory) {
        return _name;
    }

    function symbol() public view returns(string memory) {
        return _symbol;
    }

    function decimals() public view returns(uint8) {
        return _decimals;
    }
}

contract ULTRA is ERC20Detailed {

    using SafeMath for uint256;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply = 101000000000000000000000000;

    uint256 public basePercent = 320;

    constructor() public ERC20Detailed("Ultra", "XUL", 18) {
        _mint(msg.sender, _totalSupply);
    }

    /// @return Total number of tokens in circulation
    function totalSupply() public view returns(uint256) {
        return _totalSupply;
    }

    /**
     * @notice Get the number of tokens held by the `owner`
     * @param owner The address of the account to get the balance of
     * @return The number of tokens held
     */
    function balanceOf(address owner) public view returns(uint256) {
        return _balances[owner];
    }

    /**
     * @notice Get the number of tokens `spender` is approved to spend on behalf of `owner`
     * @param owner The address of the account holding the funds
     * @param spender The address of the account spending the funds
     * @return The number of tokens approved
     */
    function allowance(address owner, address spender) public view returns(uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @notice Find the number of tokens to burn from `value`. Approximated at 0.3125%.
     * @param value The value to find the burn amount from
     * @return The found burn amount
     */
    function findBurnAmount(uint256 value) public view returns(uint256) {
        //Allow transfers of 0.000000000000000001
        if (value == 1) {
            return 0;
        }
        uint256 roundValue = value.ceil(basePercent);
        //Gas optimized
        uint256 burnAmount = roundValue.mul(100).div(32000);
        return burnAmount;
    }

    /**
     * @notice Transfer `value` minus `findBurnAmount(value)` tokens from `msg.sender` to `to`, 
     * while subtracting `findBurnAmount(value)` tokens from `_totalSupply`. This performs a transfer with an approximated fee of 0.3125%
     * @param to The address of the destination account
     * @param value The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address to, uint256 value) public returns(bool) {
        require(to != address(0));

        uint256 tokensToBurn = findBurnAmount(value);
        uint256 tokensToTransfer = value.sub(tokensToBurn);

        _balances[msg.sender] = _balances[msg.sender].sub(value);
        _balances[to] = _balances[to].add(tokensToTransfer);

        _totalSupply = _totalSupply.sub(tokensToBurn);

        emit Transfer(msg.sender, to, tokensToTransfer);
        emit Transfer(msg.sender, address(0), tokensToBurn);
        return true;
    }

    /**
     * @notice Approve `spender` to transfer up to `value` from `from`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param value The number of tokens that are approved
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 value) public returns(bool) {
        require(spender != address(0));
        _allowances[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @notice Transfer `value` minus `findBurnAmount(value)` tokens from `from` to `to`, 
     * while subtracting `findBurnAmount(value)` tokens from `_totalSupply`. This performs a transfer with an approximated fee of 0.3125%
     * @param from The address of the source account
     * @param to The address of the destination account
     * @param value The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(address from, address to, uint256 value) public returns(bool) {
        require(value <= _allowances[from][msg.sender]);
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);

        uint256 tokensToBurn = findBurnAmount(value);
        uint256 tokensToTransfer = value.sub(tokensToBurn);

        _balances[to] = _balances[to].add(tokensToTransfer);
        _totalSupply = _totalSupply.sub(tokensToBurn);

        _allowances[from][msg.sender] = _allowances[from][msg.sender].sub(value);

        emit Transfer(from, to, tokensToTransfer);
        emit Transfer(from, address(0), tokensToBurn);

        return true;
    }

    /**
     * @notice Increase allowance of `spender` by 'addedValue'
     * @param spender The address of the account which may transfer tokens
     * @param addedValue Value to be added onto the existing allowance amount
     * @return Whether or not the allowance increase succeeded
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns(bool) {
        require(spender != address(0));
        _allowances[msg.sender][spender] = (_allowances[msg.sender][spender].add(addedValue));
        emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
        return true;
    }

    /**
     * @notice Decrease allowance of `spender` by 'subtractedValue'
     * @param spender The address of the account which may transfer tokens
     * @param subtractedValue Value to be subtracted onto the existing allowance amount
     * @return Whether or not the allowance decrease succeeded
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns(bool) {
        require(spender != address(0));
        _allowances[msg.sender][spender] = (_allowances[msg.sender][spender].sub(subtractedValue));
        emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
        return true;
    }

    function _mint(address account, uint256 amount) internal {
        require(amount != 0);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @notice Burn `amount` of tokens from `msg.sender` by sending them to `address(0)`
     * @param amount The amount of tokens to burn
     */
    function burn(uint256 amount) external {
        _burn(msg.sender, amount);
    }

    function _burn(address account, uint256 amount) internal {
        require(amount != 0);
        _totalSupply = _totalSupply.sub(amount);
        _balances[account] = _balances[account].sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @notice Burn `amount` of tokens from `account` by sending them to `address(0)`
     * @param amount The amount of tokens to burn
     */
    function burnFrom(address account, uint256 amount) external {
        require(amount <= _allowances[account][msg.sender]);
        _allowances[account][msg.sender] = _allowances[account][msg.sender].sub(amount);
        _burn(account, amount);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"basePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"findBurnAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

bzzr://b218475d6a9b6243473d38265ca7e95d6ff28971f79818e9b50fa3126219e809

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.