Contract Source Code:
File 1 of 1 : DNP
/**
*Submitted for verification at Etherscan.io on 2019-08-11
*/
pragma solidity ^0.5.10;
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic
{
function totalSupply() public view returns (uint256);
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath
{
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256 c)
{
if (a == 0) {
return 0;
}
c = a * b;
assert(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256)
{
return a / b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256)
{
assert(b <= a);
return a - b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256 c)
{
c = a + b;
assert(c >= a);
return c;
}
}
pragma solidity ^0.5.10;
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic
{
function allowance(address owner, address spender) public view returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract Owner
{
address internal owner;
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function changeOwner(address newOwner) public onlyOwner returns(bool)
{
owner = newOwner;
return true;
}
}
pragma solidity ^0.5.10;
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic, Owner
{
using SafeMath for uint256;
uint256 internal totalSupply_;
mapping (address => bool) internal locked;
mapping(address => uint256) internal balances;
/**
* alan: lock or unlock account
*/
function lockAccount(address _addr) public onlyOwner returns (bool)
{
require(_addr != address(0));
locked[_addr] = true;
return true;
}
function unlockAccount(address _addr) public onlyOwner returns (bool)
{
require(_addr != address(0));
locked[_addr] = false;
return true;
}
/**
* alan: get lock status
*/
function isLocked(address addr) public view returns(bool)
{
return locked[addr];
}
bool internal stopped = false;
modifier running {
assert (!stopped);
_;
}
function stop() public onlyOwner
{
stopped = true;
}
function start() public onlyOwner
{
stopped = false;
}
function isStopped() public view returns(bool)
{
return stopped;
}
/**
* @dev total number of tokens in existence
*/
function totalSupply() public view returns (uint256)
{
return totalSupply_;
}
/**
* @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, uint256 _value) public running returns (bool)
{
require(_to != address(0));
require(_value <= balances[msg.sender]);
require( locked[msg.sender] != true);
require( locked[_to] != true);
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public view returns (uint256)
{
return balances[_owner];
}
}
pragma solidity ^0.5.10;
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is ERC20, BasicToken
{
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @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 uint256 the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint256 _value) public running returns (bool)
{
require(_to != address(0));
require( locked[_from] != true && locked[_to] != true);
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* 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
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public running returns (bool)
{
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that 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 uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public view returns (uint256)
{
return allowed[_owner][_spender];
}
}
contract DNPToken is StandardToken
{
function additional(uint amount) public onlyOwner running returns(bool)
{
totalSupply_ = totalSupply_.add(amount);
balances[owner] = balances[owner].add(amount);
return true;
}
event Burn(address indexed from, uint256 value);
/**
* Destroy tokens
* Remove `_value` tokens from the system irreversibly
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public onlyOwner running returns (bool success)
{
require(balances[msg.sender] >= _value);
balances[msg.sender] = balances[msg.sender].sub(_value);
totalSupply_ = totalSupply_.sub(_value);
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 senderT
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public onlyOwner returns (bool success)
{
require(balances[_from] >= _value);
if (_value <= allowed[_from][msg.sender]) {
allowed[_from][msg.sender] -= _value;
}
else {
allowed[_from][msg.sender] = 0;
}
balances[_from] -= _value;
totalSupply_ -= _value;
emit Burn(_from, _value);
return true;
}
}
pragma solidity ^0.5.10;
contract DNP is DNPToken
{
string public constant name = "DNP";
string public constant symbol = "DNP";
uint8 public constant decimals = 18;
uint256 private constant INITIAL_SUPPLY = 2000000000 * (10 ** uint256(decimals));
constructor(uint totalSupply) public
{
owner = msg.sender;
totalSupply_ = totalSupply > 0 ? totalSupply : INITIAL_SUPPLY;
balances[owner] = totalSupply_;
}
}