Contract Source Code:
File 1 of 1 : GSCToken
pragma solidity ^0.4.18;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
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;
}
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;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
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 {
uint256 public totalSupply;
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 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 Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
/**
* @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);
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 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;
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
/**
* @title GSCToken
* @dev Global Social Chain.
*/
contract GSCToken is StandardToken, Ownable {
string public constant name = "Global Social Chain";
string public constant symbol = "GSC";
uint8 public constant decimals = 18;
uint256 private constant TOKEN_UNIT = 10 ** uint256(decimals);
uint256 private constant INITIAL_SUPPLY = (10 ** 9) * TOKEN_UNIT;
uint256 private constant PRIVATE_SALE_SUPPLY = INITIAL_SUPPLY * 35 / 100; // 35% for private sale
uint256 private constant COMMUNITY_REWARDS_SUPPLY = INITIAL_SUPPLY * 20 / 100; // 20% for community rewards
uint256 private constant COMMERCIAL_PLAN_SUPPLY = INITIAL_SUPPLY * 20 / 100; // 20% for commercial plan
uint256 private constant FOUNDATION_SUPPLY = INITIAL_SUPPLY * 15 / 100; // 15% for foundation
uint256 private constant TEAM_SUPPLY = INITIAL_SUPPLY * 10 / 100; // 10% for team
struct VestingGrant {
address beneficiary;
uint256 start;
uint256 duration; //duration for each release
uint256 amount; //total grant amount
uint256 transfered; // transfered amount
uint8 releaseCount; // schedule release count
}
address private constant PRIVAYE_SALE_ADDRESS = 0x9C99b03224122b419a84a6bD7A609f7288d65Eb9; //team vesting beneficiary address
address private constant COMMUNITY_REWARDS_ADDRESS = 0xc6b41984F90958750780AE034Ab2Ac6328386942; //community rewards wallet address
address private constant COMMERCIAL_PLAN_ADDRESS = 0x1222cdceE3D244933AAc7ec37B0313741C406f82; //commercial plan wallet address
address private constant FOUNDATION_ADDRESS = 0xB892F6224991717c9aC27eA1b67A05909f664724; //foundation wallet address
VestingGrant teamVestingGrant;
/**
* @dev Constructor that gives msg.sender all of existing tokens.
*/
function GSCToken() public {
totalSupply = INITIAL_SUPPLY;
balances[PRIVAYE_SALE_ADDRESS] = PRIVATE_SALE_SUPPLY;
balances[COMMUNITY_REWARDS_ADDRESS] = COMMUNITY_REWARDS_SUPPLY;
balances[COMMERCIAL_PLAN_ADDRESS] = COMMERCIAL_PLAN_SUPPLY;
balances[FOUNDATION_ADDRESS] = FOUNDATION_SUPPLY;
teamVestingGrant = makeGrant(msg.sender, now, (182 days), TEAM_SUPPLY, 4); // The owner address is reserved for the Team Wallet
}
function makeGrant(address _beneficiary, uint256 _start, uint256 _duration, uint256 _amount, uint8 _releaseCount)
internal pure returns (VestingGrant) {
return VestingGrant({ beneficiary : _beneficiary, start: _start, duration:_duration, amount:_amount, transfered:0, releaseCount:_releaseCount});
}
function releaseTeamVested() public onlyOwner {
relaseVestingGrant(teamVestingGrant);
}
function releasableAmount(uint256 time, VestingGrant grant) internal pure returns (uint256) {
if (grant.amount == grant.transfered) {
return 0;
}
uint256 amountPerRelease = grant.amount.div(grant.releaseCount);
uint256 amount = amountPerRelease.mul((time.sub(grant.start)).div(grant.duration));
if (amount > grant.amount) {
amount = grant.amount;
}
amount = amount.sub(grant.transfered);
return amount;
}
function relaseVestingGrant(VestingGrant storage grant) internal {
uint256 amount = releasableAmount(now, grant);
require(amount > 0);
grant.transfered = grant.transfered.add(amount);
totalSupply = totalSupply.add(amount);
balances[grant.beneficiary] = balances[grant.beneficiary].add(amount);
Transfer(address(0), grant.beneficiary, amount);
}
}