Address Contract Partially Verified
Address
0xC5807256e2E2Fe85ca94C3617C4Bc5ff2Bd9cfB6
Balance
0 ETH
Nonce
1
Code Size
10910 bytes
Creator
0x7Ce6c6F1...0277 at tx 0x68a0d198...ac4c67
Indexed Transactions
0 (1 on-chain, 0.9% indexed)
Contract Bytecode
10910 bytes
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Verified Source Code Partial Match
Compiler: v0.4.23+commit.124ca40d
EVM: byzantium
Optimization: No
DragonCoin.sol 375 lines
pragma solidity ^0.4.21;
/**
* @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) {
if (a == 0) {
return 0;
}
uint256 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) {
// 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;
}
/**
* @dev Substracts 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) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @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 Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
uint256 totalSupply_;
/**
* @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 returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
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 balance) {
return balances[_owner];
}
}
/**
* @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);
}
/**
* @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 returns (bool) {
require(_to != address(0));
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);
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 returns (bool) {
allowed[msg.sender][_spender] = _value;
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];
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _addedValue The amount of tokens to increase the allowance by.
*/
function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
contract Usable {
function use(address to, uint256 value, uint256 useType, uint256 param1, uint256 param2, uint256 param3, string param4) external;
function setUseAddr(address addr) external;
function setFee(uint256 useType, uint16 feeType, uint256 fee) external;
event UseSucc(address indexed from, address indexed to, uint256 useType, uint256 value, uint256 fee, uint256 param1, uint256 param2, uint256 param3, string param4);
event UseFail(address indexed from, address indexed to, uint256 useType, uint256 value, uint256 fee, uint256 param1, uint256 param2, uint256 param3, string param4);
}
contract DragonCoin is StandardToken, Usable {
using SafeMath for uint256;
event Mint(address indexed to, uint256 value);
event Burn(address indexed burner, uint256 value);
string public name = "DragonSeriesToken";
string public symbol = "DST";
uint public decimals = 18;
uint public INITIAL_SUPPLY = 1100000 * (10 ** decimals);
uint public MAX_SUPPLY = 10 * 100000000 * (10 ** decimals);
address public ceo;
address public coo;
address public cfo;
UseInterface public useAddr;
// key = useType, value = UseFee
mapping (uint256 => UseFee) public useFees;
uint private _maxPercentFee = 1000000;
struct UseFee {
uint16 feeType; // 1: fixed, 2: percentage
uint256 fee; // feeType=1: DST, feeType=2: 0-1000000 (0.0000% - 100.0000%)
}
function DragonCoin() public {
totalSupply_ = INITIAL_SUPPLY;
balances[msg.sender] = INITIAL_SUPPLY;
ceo = msg.sender;
emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
}
function setCEO(address newCEO) public onlyCEO{
require(newCEO != address(0));
ceo = newCEO;
}
function setCOO(address newCOO) public onlyCEO{
require(newCOO != address(0));
coo = newCOO;
}
function setCFO(address newCFO) public onlyCEO{
require(newCFO != address(0));
cfo = newCFO;
}
function mint(uint256 value) public onlyCFO returns (bool) {
require(totalSupply_.add(value) <= MAX_SUPPLY);
balances[cfo] = balances[cfo].add(value);
totalSupply_ = totalSupply_.add(value);
// mint event
emit Mint(cfo, value);
emit Transfer(0x0, cfo, value);
return true;
}
function burn(uint256 value) public onlyCOO returns (bool) {
require(balances[coo] >= value);
balances[coo] = balances[coo].sub(value);
totalSupply_ = totalSupply_.sub(value);
// burn event
emit Burn(coo, value);
emit Transfer(coo, 0x0, value);
return true;
}
// Useable
function setUseAddr(address addr) external onlyCOO{
useAddr = UseInterface(addr);
}
function setFee(uint256 useType, uint16 feeType, uint256 fee) external onlyCOO{
require(feeType == 1 || feeType == 2);
if(feeType == 2){
require(fee <= _maxPercentFee);
}
UseFee memory ufee = UseFee({
feeType: feeType,
fee: fee
});
useFees[useType] = ufee;
}
function use(address to, uint256 value, uint256 useType, uint256 param1, uint256 param2, uint256 param3, string param4) external {
require(useAddr != address(0));
require(balances[msg.sender] >= value);
require(to != address(0) && cfo != address(0));
UseFee memory ufee = useFees[useType];
require(ufee.feeType == 1 || ufee.feeType == 2);
uint256 actualFee = 0;
if(ufee.feeType == 1){ // fixed fee
actualFee = ufee.fee;
}else if(ufee.feeType == 2){ // percentage fee
actualFee = value.mul(ufee.fee).div(_maxPercentFee);
}
uint256 actualVal = value.sub(actualFee);
if(useAddr.use(msg.sender, to, value, useType, param1, param2, param3, param4)){
// transfer token
balances[msg.sender] = balances[msg.sender].sub(value);
balances[to] = balances[to].add(actualVal);
emit Transfer(msg.sender, to, actualVal);
if(actualFee > 0){
balances[cfo] = balances[cfo].add(actualFee);
emit Transfer(msg.sender, cfo, actualFee);
}
emit UseSucc(msg.sender, to, useType, value, actualFee, param1, param2, param3, param4);
}else{
emit UseFail(msg.sender, to, useType, value, actualFee, param1, param2, param3, param4);
}
}
/// @dev Access modifier for CEO-only functionality
modifier onlyCEO() {
require(msg.sender == ceo);
_;
}
/// @dev Access modifier for CFO-only functionality
modifier onlyCFO() {
require(msg.sender == cfo);
_;
}
/// @dev Access modifier for COO-only functionality
modifier onlyCOO() {
require(msg.sender == coo);
_;
}
}
contract UseInterface {
function use(address from, address to, uint256 value, uint256 useType, uint256 param1, uint256 param2, uint256 param3, string param4) external returns (bool);
}
Read Contract
INITIAL_SUPPLY 0x2ff2e9dc → uint256
MAX_SUPPLY 0x32cb6b0c → uint256
allowance 0xdd62ed3e → uint256
balanceOf 0x70a08231 → uint256
ceo 0x908921fc → address
cfo 0x1ed20347 → address
coo 0x07cdee49 → address
decimals 0x313ce567 → uint256
name 0x06fdde03 → string
symbol 0x95d89b41 → string
totalSupply 0x18160ddd → uint256
useAddr 0xfa73f074 → address
useFees 0x212cdffc → uint16, uint256
Write Contract 13 functions
These functions modify contract state and require a wallet transaction to execute.
approve 0x095ea7b3
address _spender
uint256 _value
returns: bool
burn 0x42966c68
uint256 value
returns: bool
decreaseApproval 0x66188463
address _spender
uint256 _subtractedValue
returns: bool
increaseApproval 0xd73dd623
address _spender
uint256 _addedValue
returns: bool
mint 0xa0712d68
uint256 value
returns: bool
setCEO 0x27d7874c
address newCEO
setCFO 0x4e0a3379
address newCFO
setCOO 0x2ba73c15
address newCOO
setFee 0x11a881e8
uint256 useType
uint16 feeType
uint256 fee
setUseAddr 0xb280a96e
address addr
transfer 0xa9059cbb
address _to
uint256 _value
returns: bool
transferFrom 0x23b872dd
address _from
address _to
uint256 _value
returns: bool
use 0x2182ebbf
address to
uint256 value
uint256 useType
uint256 param1
uint256 param2
uint256 param3
string param4
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