pragma solidity ^0.4.11;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal constant 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 constant returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @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;
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
assert(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) onlyOwner {
assert(newOwner != address(0));
owner = newOwner;
}
}
/*
* @title Haltable
* @dev Abstract contract that allows children to implement an emergency stop mechanism.
* @dev Differs from Pausable by causing a throw when in halt mode.
*/
contract Haltable is Ownable {
bool public halted;
modifier stopInEmergency {
assert(!halted);
_;
}
modifier onlyInEmergency {
assert(halted);
_;
}
/**
* @dev Called by the owner on emergency, triggers stopped state.
*/
function halt() external onlyOwner {
halted = true;
}
/**
* @dev Called by the owner on end of emergency, returns to normal state.
*/
function unhalt() external onlyOwner onlyInEmergency {
halted = false;
}
}
/**
* @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) constant returns (uint256);
function transfer(address to, uint256 value) 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) constant returns (uint256);
function transferFrom(address from, address to, uint256 value) returns (bool);
function approve(address spender, uint256 value) 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) onlyPayloadSize(2 * 32) returns (bool) {
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) constant returns (uint256 balance) {
return balances[_owner];
}
/**
* @dev Fix for the ERC20 short address attack
* @dev see: http://vessenes.com/the-erc20-short-address-attack-explained/
* @dev see: https://www.reddit.com/r/ethereum/comments/63s917/worrysome_bug_exploit_with_erc20_token/dfwmhc3/
*/
modifier onlyPayloadSize(uint size) {
assert (msg.data.length >= size + 4);
_;
}
}
/**
* @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)) 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 amout of tokens to be transfered
*/
function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
var _allowance = allowed[_from][msg.sender];
// Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
// assert (_value <= _allowance);
balances[_to] = balances[_to].add(_value);
balances[_from] = balances[_from].sub(_value);
allowed[_from][msg.sender] = _allowance.sub(_value);
Transfer(_from, _to, _value);
return true;
}
/**
* @dev Aprove the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) returns (bool) {
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender, 0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
assert((_value == 0) || (allowed[msg.sender][_spender] == 0));
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 specifing the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
/**
* @title MintableToken
* @dev Token that can be minted by another contract until the defined cap is reached.
* @dev Based on https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
*/
contract MintableToken is StandardToken, Ownable {
using SafeMath for uint;
uint256 public mintableSupply;
/**
* @dev List of agents that are allowed to create new tokens
*/
mapping(address => bool) public mintAgents;
event MintingAgentChanged(address addr, bool state);
/**
* @dev Mint token from pool of mintable tokens.
* @dev Only callable by the mint-agent.
*/
function mint(address receiver, uint256 amount) onlyPayloadSize(2 * 32) onlyMintAgent canMint public {
mintableSupply = mintableSupply.sub(amount);
balances[receiver] = balances[receiver].add(amount);
// This will make the mint transaction appear in EtherScan.io
// We can remove this after there is a standardized minting event
Transfer(0, receiver, amount);
}
/**
* @dev Owner can allow a crowdsale contract to mint new tokens.
*/
function setMintAgent(address addr, bool state) onlyOwner canMint public {
mintAgents[addr] = state;
MintingAgentChanged(addr, state);
}
modifier onlyMintAgent() {
// Only the mint-agent is allowed to mint new tokens
assert (mintAgents[msg.sender]);
_;
}
/**
* @dev Make sure we are not done yet.
*/
modifier canMint() {
assert(mintableSupply > 0);
_;
}
/**
* @dev Fix for the ERC20 short address attack
* @dev see: http://vessenes.com/the-erc20-short-address-attack-explained/
* @dev see: https://www.reddit.com/r/ethereum/comments/63s917/worrysome_bug_exploit_with_erc20_token/dfwmhc3/
*/
modifier onlyPayloadSize(uint size) {
assert (msg.data.length >= size + 4);
_;
}
}
/*
* @title ReleasableToken
* @dev Token that may not be transfered until it was released.
*/
contract ReleasableToken is ERC20, Ownable {
address public releaseAgent;
bool public released = false;
/**
* @dev One way function to release the tokens to the wild.
*/
function releaseToken() public onlyReleaseAgent {
released = true;
}
/**
* @dev Set the contract that may call the release function.
*/
function setReleaseAgent(address addr) onlyOwner inReleaseState(false) public {
releaseAgent = addr;
}
function transfer(address _to, uint _value) inReleaseState(true) returns (bool) {
return super.transfer(_to, _value);
}
function transferFrom(address _from, address _to, uint _value) inReleaseState(true) returns (bool) {
return super.transferFrom(_from, _to, _value);
}
/**
* @dev The function can be called only before or after the tokens have been releasesd
*/
modifier inReleaseState(bool releaseState) {
assert(releaseState == released);
_;
}
/**
* @dev The function can be called only by a whitelisted release agent.
*/
modifier onlyReleaseAgent() {
assert(msg.sender == releaseAgent);
_;
}
}
/**
* @title EventChain
* @dev Contract for the EventChain token.
*/
contract EventChain is ReleasableToken, MintableToken {
string public name = "EventChain";
string public symbol = "EVC";
uint8 public decimals = 18;
function EventChain() {
// total supply is 84 million tokens
totalSupply = 84000000 ether;
mintableSupply = totalSupply;
// allow deployer to unlock token transfer and mint tokens
setReleaseAgent(msg.sender);
setMintAgent(msg.sender, true);
}
}
/*
* @title Crowdsale
* @dev Contract to manage the EVC crowdsale
* @dev Using assert over assert within the contract in order to generate error opscodes (0xfe), that will properly show up in etherscan
* @dev The assert error opscode (0xfd) will show up in etherscan after the metropolis release
* @dev see: https://ethereum.stackexchange.com/a/24185
*/
contract EventChainCrowdsale is Haltable {
using SafeMath for uint256;
enum State{Ready, Phase1, Phase2, Phase3, CrowdsaleEnded}
uint256 constant public PHASE2_SUPPLY = 21000000 ether;
uint256 constant public PHASE3_SUPPLY = 22600000 ether;
uint256 constant public PHASE1_RATE = 1140;
uint256 constant public PHASE2_RATE = 920;
uint256 constant public PHASE3_RATE = 800;
uint256 constant public MIN_INVEST = 10 finney;
uint256 constant public BTWO_CLAIM_PERCENT = 3;
EventChain public evc;
address public beneficiary;
address public beneficiaryTwo;
uint256 public totalRaised;
State public currentState;
uint256 public currentRate;
uint256 public currentSupply;
uint256 public currentTotalSupply;
event StateChanged(State from, State to);
event FundsClaimed(address receiver, uint256 claim, string crowdsalePhase);
event InvestmentMade(
address investor,
uint256 weiAmount,
uint256 tokenAmount,
string crowdsalePhase,
bytes calldata
);
function EventChainCrowdsale(EventChain _evc, address _beneficiary, address _beneficiaryTwo) {
assert(address(_evc) != 0x0);
assert(address(_beneficiary) != 0x0);
assert(address(_beneficiaryTwo) != 0x0);
beneficiary = _beneficiary;
beneficiaryTwo = _beneficiaryTwo;
evc = _evc;
}
function() payable onlyWhenCrowdsaleIsOpen stopInEmergency external {
assert(msg.data.length <= 68); // 64 bytes data limit plus 4 for the prefix
assert(msg.value >= MIN_INVEST);
uint256 tokens = msg.value.mul(currentRate);
currentSupply = currentSupply.sub(tokens);
evc.mint(msg.sender, tokens);
totalRaised = totalRaised.add(msg.value);
InvestmentMade(
msg.sender,
msg.value,
tokens,
currentStateToString(),
msg.data
);
}
function startPhase1() onlyOwner inState(State.Ready) stopInEmergency external {
currentTotalSupply = evc.mintableSupply().sub(PHASE2_SUPPLY).sub(PHASE3_SUPPLY);
currentSupply = currentTotalSupply;
currentRate = PHASE1_RATE;
currentState = State.Phase1;
StateChanged(State.Ready, currentState);
}
function startPhase2() onlyOwner inState(State.Phase1) stopInEmergency external {
phaseClaim();
currentTotalSupply = currentSupply.add(PHASE2_SUPPLY);
currentSupply = currentTotalSupply;
currentRate = PHASE2_RATE;
currentState = State.Phase2;
StateChanged(State.Phase1, currentState);
}
function startPhase3() onlyOwner inState(State.Phase2) stopInEmergency external {
phaseClaim();
currentTotalSupply = currentSupply.add(PHASE3_SUPPLY);
currentSupply = currentTotalSupply;
currentRate = PHASE3_RATE;
currentState = State.Phase3;
StateChanged(State.Phase2, currentState);
}
function endCrowdsale() onlyOwner inState(State.Phase3) stopInEmergency external {
phaseClaim();
currentTotalSupply = 0;
currentSupply = 0;
currentRate = 0;
currentState = State.CrowdsaleEnded;
StateChanged(State.Phase3, currentState);
}
function currentStateToString() constant returns (string) {
if (currentState == State.Ready) {
return "Ready";
} else if (currentState == State.Phase1) {
return "Phase 1";
} else if (currentState == State.Phase2) {
return "Phase 2";
} else if (currentState == State.Phase3) {
return "Phase 3";
} else {
return "Crowdsale ended";
}
}
function phaseClaim() internal {
uint256 beneficiaryTwoClaim = this.balance.div(100).mul(BTWO_CLAIM_PERCENT);
beneficiaryTwo.transfer(beneficiaryTwoClaim);
FundsClaimed(beneficiaryTwo, beneficiaryTwoClaim, currentStateToString());
uint256 beneficiaryClaim = this.balance;
beneficiary.transfer(this.balance);
FundsClaimed(beneficiary, beneficiaryClaim, currentStateToString());
}
modifier inState(State _state) {
assert(currentState == _state);
_;
}
modifier onlyWhenCrowdsaleIsOpen() {
assert(currentState == State.Phase1 || currentState == State.Phase2 || currentState == State.Phase3);
_;
}
}
{
"compilationTarget": {
"EventChainCrowdsale.sol": "EventChainCrowdsale"
},
"libraries": {},
"optimizer": {
"enabled": true,
"runs": 200
},
"remappings": []
}
[{"constant":true,"inputs":[],"name":"currentState","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"evc","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"MIN_INVEST","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"beneficiaryTwo","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"endCrowdsale","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"currentStateToString","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PHASE3_SUPPLY","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PHASE3_RATE","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"beneficiary","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"currentTotalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"halt","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"startPhase3","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"currentSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"BTWO_CLAIM_PERCENT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PHASE2_SUPPLY","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"startPhase1","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"PHASE1_RATE","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PHASE2_RATE","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"halted","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalRaised","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unhalt","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"currentRate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"startPhase2","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_evc","type":"address"},{"name":"_beneficiary","type":"address"},{"name":"_beneficiaryTwo","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":false,"name":"from","type":"uint8"},{"indexed":false,"name":"to","type":"uint8"}],"name":"StateChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"receiver","type":"address"},{"indexed":false,"name":"claim","type":"uint256"},{"indexed":false,"name":"crowdsalePhase","type":"string"}],"name":"FundsClaimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"investor","type":"address"},{"indexed":false,"name":"weiAmount","type":"uint256"},{"indexed":false,"name":"tokenAmount","type":"uint256"},{"indexed":false,"name":"crowdsalePhase","type":"string"},{"indexed":false,"name":"calldata","type":"bytes"}],"name":"InvestmentMade","type":"event"}]