Contract

Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

• interface tokenRecipient function re ...
•  contract TokenERC20 *
•    - function TokenERC20(
•    - function _transfer(address _from, add ...
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function approveAndCall(address _spen ...
•    - function burn(uint256 _value)
•    - function burnFrom(address _from, uint ...

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2019-01-05
*/

pragma solidity ^0.4.25;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }

contract TokenERC20 {
    // Public variables of the token
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply;

    // This creates an array with all balances
    mapping (address => uint256) public balanceOf;
    mapping (address => mapping (address => uint256)) public allowance;

    // This generates a public event on the blockchain that will notify clients
    event Transfer(address indexed from, address indexed to, uint256 value);
    
    // This generates a public event on the blockchain that will notify clients
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    // This notifies clients about the amount burnt
    event Burn(address indexed from, uint256 value);

    /**
     * Constructor function
     *
     * Initializes contract with initial supply tokens to the creator of the contract
     */
    function TokenERC20(
        uint256 initialSupply,
        string tokenName,
        string tokenSymbol
    ) public {
        totalSupply = 21000000 * 10 ** uint256(decimals);  // Update total supply with the decimal amount
        balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
        name = 'YoozCoin';                                   // Set the name for display purposes
        symbol = 'YZC';                               // Set the symbol for display purposes
    }

    /**
     * Internal transfer, only can be called by this contract
     */
    function _transfer(address _from, address _to, uint _value) internal {
        // Prevent transfer to 0x0 address. Use burn() instead
        require(_to != 0x0);
        // Check if the sender has enough
        require(balanceOf[_from] >= _value);
        // Check for overflows
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        // Save this for an assertion in the future
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        // Subtract from the sender
        balanceOf[_from] -= _value;
        // Add the same to the recipient
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
        // Asserts are used to use static analysis to find bugs in your code. They should never fail
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

    /**
     * Transfer tokens
     *
     * Send `_value` tokens to `_to` from your account
     *
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transfer(address _to, uint256 _value) public returns (bool success) {
        _transfer(msg.sender, _to, _value);
        return true;
    }

    /**
     * Transfer tokens from other address
     *
     * Send `_value` tokens to `_to` on behalf of `_from`
     *
     * @param _from The address of the sender
     * @param _to The address of the recipient
     * @param _value the amount to send
     */
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     // Check allowance
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    /**
     * Set allowance for other address
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     */
    function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * Set allowance for other address and notify
     *
     * Allows `_spender` to spend no more than `_value` tokens on your behalf, and then ping the contract about it
     *
     * @param _spender The address authorized to spend
     * @param _value the max amount they can spend
     * @param _extraData some extra information to send to the approved contract
     */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData)
        public
        returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }

    /**
     * Destroy tokens
     *
     * Remove `_value` tokens from the system irreversibly
     *
     * @param _value the amount of money to burn
     */
    function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);   // Check if the sender has enough
        balanceOf[msg.sender] -= _value;            // Subtract from the sender
        totalSupply -= _value;                      // Updates totalSupply
        emit Burn(msg.sender, _value);
        return true;
    }

    /**
     * Destroy tokens from other account
     *
     * Remove `_value` tokens from the system irreversibly on behalf of `_from`.
     *
     * @param _from the address of the sender
     * @param _value the amount of money to burn
     */
    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value);                // Check if the targeted balance is enough
        require(_value <= allowance[_from][msg.sender]);    // Check allowance
        balanceOf[_from] -= _value;                         // Subtract from the targeted balance
        allowance[_from][msg.sender] -= _value;             // Subtract from the sender's allowance
        totalSupply -= _value;                              // Update totalSupply
        emit Burn(_from, _value);
        return true;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_value","type":"uint256"}],"name":"burn","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_value","type":"uint256"}],"name":"burnFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_extraData","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"initialSupply","type":"uint256"},{"name":"tokenName","type":"string"},{"name":"tokenSymbol","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"}]

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

00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : initialSupply (uint256): 0
Arg [1] : tokenName (string): 
Arg [2] : tokenSymbol (string): 

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000

bzzr://ad0bc746c1570122b01be43360bc9cabb230ea8e978415c07dd2385eb8b8f689