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 2018-03-09
*/

pragma solidity ^0.4.16;

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

contract TokenERC20 {
    // Public variables of the token
    string public name = "Value Promise Protocol token";
    string public symbol = "VPP";
    uint256 public decimals = 18;
    // 18 decimals is the strongly suggested default, avoid changing it
    uint256 public totalSupply = 50*10**(18+8);
    

    // 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 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(
    ) public {
        balanceOf[msg.sender] = totalSupply;                // Give the creator all initial tokens
    }

    /**
     * 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;
        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 {
        _transfer(msg.sender, _to, _value);
    }

    /**
     * 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;
        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
        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
        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":"uint256"}],"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":[],"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":[],"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":"from","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Burn","type":"event"}]

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

bzzr://68871f0b693d465d0453e21bf79c8bbdd328aee2e9ed4a51716e9a59a9ff0f75