/**
 * This smart contract code is Copyright 2018 TokenMarket Ltd. For more information see https://tokenmarket.net
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 * NatSpec is used intentionally to cover also other than public functions
 * Solidity 0.4.18 is intentionally used: it's stable, and our framework is
 * based on that.
 */


/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */


/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */





/**
 * @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 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);
}

/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */








/**
 * @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 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) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}



/**
 * @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);
    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;
  }

}

/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */




/**
 * @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;
  }

}



contract Recoverable is Ownable {

  /// @dev Empty constructor (for now)
  function Recoverable() {
  }

  /// @dev This will be invoked by the owner, when owner wants to rescue tokens
  /// @param token Token which will we rescue to the owner from the contract
  function recoverTokens(ERC20Basic token) onlyOwner public {
    token.transfer(owner, tokensToBeReturned(token));
  }

  /// @dev Interface function, can be overwritten by the superclass
  /// @param token Token which balance we will check and return
  /// @return The amount of tokens (in smallest denominator) the contract owns
  function tokensToBeReturned(ERC20Basic token) public returns (uint) {
    return token.balanceOf(this);
  }
}



/**
 * Standard EIP-20 token with an interface marker.
 *
 * @notice Interface marker is used by crowdsale contracts to validate that addresses point a good token contract.
 *
 */
contract StandardTokenExt is StandardToken, Recoverable {

  /* Interface declaration */
  function isToken() public constant returns (bool weAre) {
    return true;
  }
}

/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */


/**
 * Upgrade agent interface inspired by Lunyr.
 *
 * Upgrade agent transfers tokens to a new contract.
 * Upgrade agent itself can be the token contract, or just a middle man contract doing the heavy lifting.
 */
contract UpgradeAgent {

  uint public originalSupply;

  /** Interface marker */
  function isUpgradeAgent() public constant returns (bool) {
    return true;
  }

  function upgradeFrom(address _from, uint256 _value) public;

}


/**
 * A token upgrade mechanism where users can opt-in amount of tokens to the next smart contract revision.
 *
 * First envisioned by Golem and Lunyr projects.
 */
contract UpgradeableToken is StandardTokenExt {

  /** Contract / person who can set the upgrade path. This can be the same as team multisig wallet, as what it is with its default value. */
  address public upgradeMaster;

  /** The next contract where the tokens will be migrated. */
  UpgradeAgent public upgradeAgent;

  /** How many tokens we have upgraded by now. */
  uint256 public totalUpgraded;

  /**
   * Upgrade states.
   *
   * - NotAllowed: The child contract has not reached a condition where the upgrade can bgun
   * - WaitingForAgent: Token allows upgrade, but we don't have a new agent yet
   * - ReadyToUpgrade: The agent is set, but not a single token has been upgraded yet
   * - Upgrading: Upgrade agent is set and the balance holders can upgrade their tokens
   *
   */
  enum UpgradeState {Unknown, NotAllowed, WaitingForAgent, ReadyToUpgrade, Upgrading}

  /**
   * Somebody has upgraded some of his tokens.
   */
  event Upgrade(address indexed _from, address indexed _to, uint256 _value);

  /**
   * New upgrade agent available.
   */
  event UpgradeAgentSet(address agent);

  /**
   * Do not allow construction without upgrade master set.
   */
  function UpgradeableToken(address _upgradeMaster) {
    upgradeMaster = _upgradeMaster;
  }

  /**
   * Allow the token holder to upgrade some of their tokens to a new contract.
   */
  function upgrade(uint256 value) public {

      UpgradeState state = getUpgradeState();
      if(!(state == UpgradeState.ReadyToUpgrade || state == UpgradeState.Upgrading)) {
        // Called in a bad state
        throw;
      }

      // Validate input value.
      if (value == 0) throw;

      balances[msg.sender] = balances[msg.sender].sub(value);

      // Take tokens out from circulation
      totalSupply_ = totalSupply_.sub(value);
      totalUpgraded = totalUpgraded.add(value);

      // Upgrade agent reissues the tokens
      upgradeAgent.upgradeFrom(msg.sender, value);
      Upgrade(msg.sender, upgradeAgent, value);
  }

  /**
   * Set an upgrade agent that handles
   */
  function setUpgradeAgent(address agent) external {

      if(!canUpgrade()) {
        // The token is not yet in a state that we could think upgrading
        throw;
      }

      if (agent == 0x0) throw;
      // Only a master can designate the next agent
      if (msg.sender != upgradeMaster) throw;
      // Upgrade has already begun for an agent
      if (getUpgradeState() == UpgradeState.Upgrading) throw;

      upgradeAgent = UpgradeAgent(agent);

      // Bad interface
      if(!upgradeAgent.isUpgradeAgent()) throw;
      // Make sure that token supplies match in source and target
      if (upgradeAgent.originalSupply() != totalSupply_) throw;

      UpgradeAgentSet(upgradeAgent);
  }

  /**
   * Get the state of the token upgrade.
   */
  function getUpgradeState() public constant returns(UpgradeState) {
    if(!canUpgrade()) return UpgradeState.NotAllowed;
    else if(address(upgradeAgent) == 0x00) return UpgradeState.WaitingForAgent;
    else if(totalUpgraded == 0) return UpgradeState.ReadyToUpgrade;
    else return UpgradeState.Upgrading;
  }

  /**
   * Change the upgrade master.
   *
   * This allows us to set a new owner for the upgrade mechanism.
   */
  function setUpgradeMaster(address master) public {
      if (master == 0x0) throw;
      if (msg.sender != upgradeMaster) throw;
      upgradeMaster = master;
  }

  /**
   * Child contract can enable to provide the condition when the upgrade can begun.
   */
  function canUpgrade() public constant returns(bool) {
     return true;
  }

}

/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */





/**
 * Define interface for releasing the token transfer after a successful crowdsale.
 */
contract ReleasableToken is StandardTokenExt {

  /* The finalizer contract that allows unlift the transfer limits on this token */
  address public releaseAgent;

  /** A crowdsale contract can release us to the wild if ICO success. If false we are are in transfer lock up period.*/
  bool public released = false;

  /** Map of agents that are allowed to transfer tokens regardless of the lock down period. These are crowdsale contracts and possible the team multisig itself. */
  mapping (address => bool) public transferAgents;

  /**
   * Limit token transfer until the crowdsale is over.
   *
   */
  modifier canTransfer(address _sender) {

    if(!released) {
        if(!transferAgents[_sender]) {
            throw;
        }
    }

    _;
  }

  /**
   * Set the contract that can call release and make the token transferable.
   *
   * Design choice. Allow reset the release agent to fix fat finger mistakes.
   */
  function setReleaseAgent(address addr) onlyOwner inReleaseState(false) public {

    // We don't do interface check here as we might want to a normal wallet address to act as a release agent
    releaseAgent = addr;
  }

  /**
   * Owner can allow a particular address (a crowdsale contract) to transfer tokens despite the lock up period.
   */
  function setTransferAgent(address addr, bool state) onlyOwner inReleaseState(false) public {
    transferAgents[addr] = state;
  }

  /**
   * One way function to release the tokens to the wild.
   *
   * Can be called only from the release agent that is the final ICO contract. It is only called if the crowdsale has been success (first milestone reached).
   */
  function releaseTokenTransfer() public onlyReleaseAgent {
    released = true;
  }

  /** The function can be called only before or after the tokens have been releasesd */
  modifier inReleaseState(bool releaseState) {
    if(releaseState != released) {
        throw;
    }
    _;
  }

  /** The function can be called only by a whitelisted release agent. */
  modifier onlyReleaseAgent() {
    if(msg.sender != releaseAgent) {
        throw;
    }
    _;
  }

  function transfer(address _to, uint _value) canTransfer(msg.sender) returns (bool success) {
    // Call StandardToken.transfer()
   return super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint _value) canTransfer(_from) returns (bool success) {
    // Call StandardToken.transferForm()
    return super.transferFrom(_from, _to, _value);
  }

}

/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */



/**
 * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
 *
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 */


/**
 * Safe unsigned safe math.
 *
 * https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736#.750gwtwli
 *
 * Originally from https://raw.githubusercontent.com/AragonOne/zeppelin-solidity/master/contracts/SafeMathLib.sol
 *
 * Maintained here until merged to mainline zeppelin-solidity.
 *
 */
library SafeMathLib {

  function times(uint a, uint b) returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function minus(uint a, uint b) returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function plus(uint a, uint b) returns (uint) {
    uint c = a + b;
    assert(c>=a);
    return c;
  }

}



/**
 * A token that can increase its supply by another contract.
 *
 * This allows uncapped crowdsale by dynamically increasing the supply when money pours in.
 * Only mint agents, contracts whitelisted by owner, can mint new tokens.
 *
 */
contract MintableToken is StandardTokenExt {

  using SafeMathLib for uint;

  bool public mintingFinished = false;

  /** List of agents that are allowed to create new tokens */
  mapping (address => bool) public mintAgents;

  event MintingAgentChanged(address addr, bool state);
  event Minted(address receiver, uint amount);

  /**
   * Create new tokens and allocate them to an address..
   *
   * Only callably by a crowdsale contract (mint agent).
   */
  function mint(address receiver, uint amount) onlyMintAgent canMint public {
    totalSupply_ = totalSupply_.plus(amount);
    balances[receiver] = balances[receiver].plus(amount);

    // This will make the mint transaction apper in EtherScan.io
    // We can remove this after there is a standardized minting event
    Transfer(0, receiver, amount);
  }

  /**
   * 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 crowdsale contracts are allowed to mint new tokens
    if(!mintAgents[msg.sender]) {
        throw;
    }
    _;
  }

  /** Make sure we are not done yet. */
  modifier canMint() {
    if(mintingFinished) throw;
    _;
  }
}



/**
 * A crowdsaled token.
 *
 * An ERC-20 token designed specifically for crowdsales with investor protection and further development path.
 *
 * - The token transfer() is disabled until the crowdsale is over
 * - The token contract gives an opt-in upgrade path to a new contract
 * - The same token can be part of several crowdsales through approve() mechanism
 * - The token can be capped (supply set in the constructor) or uncapped (crowdsale contract can mint new tokens)
 *
 */
contract CrowdsaleToken is ReleasableToken, MintableToken, UpgradeableToken {

  /** Name and symbol were updated. */
  event UpdatedTokenInformation(string newName, string newSymbol);

  string public name;

  string public symbol;

  uint public decimals;

  /**
   * Construct the token.
   *
   * This token must be created through a team multisig wallet, so that it is owned by that wallet.
   *
   * @param _name Token name
   * @param _symbol Token symbol - should be all caps
   * @param _initialSupply How many tokens we start with
   * @param _decimals Number of decimal places
   * @param _mintable Are new tokens created over the crowdsale or do we distribute only the initial supply? Note that when the token becomes transferable the minting always ends.
   */
  function CrowdsaleToken(string _name, string _symbol, uint _initialSupply, uint _decimals, bool _mintable)
    UpgradeableToken(msg.sender) {

    // Create any address, can be transferred
    // to team multisig via changeOwner(),
    // also remember to call setUpgradeMaster()
    owner = msg.sender;

    name = _name;
    symbol = _symbol;

    totalSupply_ = _initialSupply;

    decimals = _decimals;

    // Create initially all balance on the team multisig
    balances[owner] = totalSupply_;

    if(totalSupply_ > 0) {
      Minted(owner, totalSupply_);
    }

    // No more new supply allowed after the token creation
    if(!_mintable) {
      mintingFinished = true;
      if(totalSupply_ == 0) {
        throw; // Cannot create a token without supply and no minting
      }
    }
  }

  /**
   * When token is released to be transferable, enforce no new tokens can be created.
   */
  function releaseTokenTransfer() public onlyReleaseAgent {
    mintingFinished = true;
    super.releaseTokenTransfer();
  }

  /**
   * Allow upgrade agent functionality kick in only if the crowdsale was success.
   */
  function canUpgrade() public constant returns(bool) {
    return released && super.canUpgrade();
  }

  /**
   * Owner can update token information here.
   *
   * It is often useful to conceal the actual token association, until
   * the token operations, like central issuance or reissuance have been completed.
   *
   * This function allows the token owner to rename the token after the operations
   * have been completed and then point the audience to use the token contract.
   */
  function setTokenInformation(string _name, string _symbol) onlyOwner {
    name = _name;
    symbol = _symbol;

    UpdatedTokenInformation(name, symbol);
  }

}


/**
 * This smart contract code is Copyright 2018 TokenMarket Ltd. For more information see https://tokenmarket.net
 * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
 * NatSpec is used intentionally to cover also other than public functions
 * Solidity 0.4.18 is intentionally used: it's stable, and our framework is
 * based on that.
 */




interface SecurityTransferAgent {
  function verify(address from, address to, uint256 value) public returns (uint256 newValue);
}







/**
 * @title Whitelist
 * @dev The Whitelist contract has a whitelist of addresses, and provides basic authorization control functions.
 * @dev This simplifies the implementation of "user permissions".
 */
contract Whitelist is Ownable {
  mapping(address => bool) public whitelist;
  
  event WhitelistedAddressAdded(address addr);
  event WhitelistedAddressRemoved(address addr);

  /**
   * @dev Throws if called by any account that's not whitelisted.
   */
  modifier onlyWhitelisted() {
    require(whitelist[msg.sender]);
    _;
  }

  /**
   * @dev add an address to the whitelist
   * @param addr address
   * @return true if the address was added to the whitelist, false if the address was already in the whitelist 
   */
  function addAddressToWhitelist(address addr) onlyOwner public returns(bool success) {
    if (!whitelist[addr]) {
      whitelist[addr] = true;
      WhitelistedAddressAdded(addr);
      success = true; 
    }
  }

  /**
   * @dev add addresses to the whitelist
   * @param addrs addresses
   * @return true if at least one address was added to the whitelist, 
   * false if all addresses were already in the whitelist  
   */
  function addAddressesToWhitelist(address[] addrs) onlyOwner public returns(bool success) {
    for (uint256 i = 0; i < addrs.length; i++) {
      if (addAddressToWhitelist(addrs[i])) {
        success = true;
      }
    }
  }

  /**
   * @dev remove an address from the whitelist
   * @param addr address
   * @return true if the address was removed from the whitelist, 
   * false if the address wasn't in the whitelist in the first place 
   */
  function removeAddressFromWhitelist(address addr) onlyOwner public returns(bool success) {
    if (whitelist[addr]) {
      whitelist[addr] = false;
      WhitelistedAddressRemoved(addr);
      success = true;
    }
  }

  /**
   * @dev remove addresses from the whitelist
   * @param addrs addresses
   * @return true if at least one address was removed from the whitelist, 
   * false if all addresses weren't in the whitelist in the first place
   */
  function removeAddressesFromWhitelist(address[] addrs) onlyOwner public returns(bool success) {
    for (uint256 i = 0; i < addrs.length; i++) {
      if (removeAddressFromWhitelist(addrs[i])) {
        success = true;
      }
    }
  }

}





interface ERC677Receiver {
  function tokenFallback(address from, uint256 amount, bytes data) returns (bool success);
}

interface ERC677 {
  event Transfer(address from, address receiver, uint256 amount, bytes data);
  function transferAndCall(ERC677Receiver receiver, uint amount, bytes data) returns (bool success);
}



contract ERC677Token is ERC20, ERC677 {
  function transferAndCall(ERC677Receiver receiver, uint amount, bytes data) returns (bool success) {
    require(transfer(address(receiver), amount));

    Transfer(msg.sender, address(receiver), amount, data);

    require(receiver.tokenFallback(msg.sender, amount, data));
  }
}


/**
 * @author TokenMarket /  Ville Sundell <ville at tokenmarket.net>
 */
contract CheckpointToken is ERC677Token {
  using SafeMath for uint256; // We use only uint256 for safety reasons (no boxing)

  string public name;
  string public symbol;
  uint256 public decimals;
  SecurityTransferAgent public transferVerifier;

  struct Checkpoint {
    uint256 blockNumber;
    uint256 value;
  }

  mapping (address => Checkpoint[]) public tokenBalances;
  Checkpoint[] public tokensTotal;

  mapping (address => mapping (address => uint256)) public allowed;

  /**
   * @dev Constructor for CheckpointToken, initializing the token
   *
   * Here we define initial values for name, symbol and decimals.
   *
   * @param _name Initial name of the token
   * @param _symbol Initial symbol of the token
   * @param _decimals Number of decimals for the token, industry standard is 18
   */
  function CheckpointToken(string _name, string _symbol, uint256 _decimals) public {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
  }

  /** PUBLIC FUNCTIONS
   ****************************************/

  /**
   * @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 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.
   * @return true if the call function was executed successfully
   */
  function approve(address spender, uint256 value) public returns (bool) {
    allowed[msg.sender][spender] = value;
    Approval(msg.sender, spender, value);
    return true;
  }

  /**
   * @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
   * @return true if the call function was executed successfully
   */
  function transferFrom(address from, address to, uint256 value) public returns (bool) {
    require(value <= allowed[from][msg.sender]);

    transferInternal(from, to, value);
    Transfer(from, to, value);
    return true;
  }

  /**
   * @dev transfer token for a specified address
   * @param to The address to transfer to.
   * @param value The amount to be transferred.
   * @return true if the call function was executed successfully
   */
  function transfer(address to, uint256 value) public returns (bool) {
    transferInternal(msg.sender, to, value);
    Transfer(msg.sender, to, value);
    return true;
  }

  /**
   * @dev total number of tokens in existence
   * @return A uint256 specifying the total number of tokens in existence
   */
  function totalSupply() public view returns (uint256 tokenCount) {
    tokenCount = balanceAtBlock(tokensTotal, block.number);
  }

  /**
   * @dev total number of tokens in existence at the given block
   * @param blockNumber The block number we want to query for the total supply
   * @return A uint256 specifying the total number of tokens at a given block
   */
  function totalSupplyAt(uint256 blockNumber) public view returns (uint256 tokenCount) {
    tokenCount = balanceAtBlock(tokensTotal, blockNumber);
  }

  /**
   * @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) {
    balance = balanceAtBlock(tokenBalances[owner], block.number);
  }

  /**
   * @dev Gets the balance of the specified address.
   * @param owner The address to query the the balance of.
   * @param blockNumber The block number we want to query for the balance.
   * @return An uint256 representing the amount owned by the passed address.
   */
  function balanceAt(address owner, uint256 blockNumber) public view returns (uint256 balance) {
    balance = balanceAtBlock(tokenBalances[owner], blockNumber);
  }

  /**
   * @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;
  }

  /**
   * @dev Addition to StandardToken methods. Increase the amount of tokens that
   * an owner allowed to a spender and execute a call with the sent data.
   *
   * This is originally from OpenZeppelin.
   *
   * 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.
   * @param data ABI-encoded contract call to call `spender` address.
   */
  function increaseApproval(address spender, uint addedValue, bytes data) public returns (bool) {
    require(spender != address(this));

    increaseApproval(spender, addedValue);

    require(spender.call(data));

    return true;
  }

  /**
   * @dev Addition to StandardToken methods. Decrease the amount of tokens that
   * an owner allowed to a spender and execute a call with the sent data.
   *
   * This is originally from OpenZeppelin.
   *
   * 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.
   * @param data ABI-encoded contract call to call `spender` address.
   */
  function decreaseApproval(address spender, uint subtractedValue, bytes data) public returns (bool) {
    require(spender != address(this));

    decreaseApproval(spender, subtractedValue);

    require(spender.call(data));

    return true;
  }

  /** INTERNALS
   ****************************************/

  function balanceAtBlock(Checkpoint[] storage checkpoints, uint256 blockNumber) internal returns (uint256 balance) {
    uint256 currentBlockNumber;
    (currentBlockNumber, balance) = getCheckpoint(checkpoints, blockNumber);
  }

  function transferInternal(address from, address to, uint256 value) internal {
    if (address(transferVerifier) != address(0)) {
      value = transferVerifier.verify(from, to, value);
      require(value > 0);
    }

    uint256 fromBalance;
    uint256 toBalance;

    fromBalance = balanceOf(from);
    toBalance = balanceOf(to);

    setCheckpoint(tokenBalances[from], fromBalance.sub(value));
    setCheckpoint(tokenBalances[to], toBalance.add(value));
  }


  /** CORE
   ** The Magic happens below:
   ***************************************/

  function setCheckpoint(Checkpoint[] storage checkpoints, uint256 newValue) internal {
    if ((checkpoints.length == 0) || (checkpoints[checkpoints.length.sub(1)].blockNumber < block.number)) {
      checkpoints.push(Checkpoint(block.number, newValue));
    } else {
       checkpoints[checkpoints.length.sub(1)] = Checkpoint(block.number, newValue);
    }
  }

  function getCheckpoint(Checkpoint[] storage checkpoints, uint256 blockNumber) internal returns (uint256 blockNumber_, uint256 value) {
    if (checkpoints.length == 0) {
      return (0, 0);
    }

    // Shortcut for the actual value
    if (blockNumber >= checkpoints[checkpoints.length.sub(1)].blockNumber) {
      return (checkpoints[checkpoints.length.sub(1)].blockNumber, checkpoints[checkpoints.length.sub(1)].value);
    }

    if (blockNumber < checkpoints[0].blockNumber) {
      return (0, 0);
    }

    // Binary search of the value in the array
    uint256 min = 0;
    uint256 max = checkpoints.length.sub(1);
    while (max > min) {
      uint256 mid = (max.add(min.add(1))).div(2);
      if (checkpoints[mid].blockNumber <= blockNumber) {
        min = mid;
      } else {
        max = mid.sub(1);
      }
    }

    return (checkpoints[min].blockNumber, checkpoints[min].value);
  }
}




/**
 * @dev Interface for general announcements about the security.
 *
 * Announcements can be for instance for dividend sharing, voting, or
 * just for general announcements.
 */
interface Announcement {
  function announcementName() public view returns (bytes32);
  function announcementURI() public view returns (bytes32);
  function announcementType() public view returns (uint256);
  function announcementHash() public view returns (uint256);
}

/**
 * @author TokenMarket /  Ville Sundell <ville at tokenmarket.net>
 */
contract SecurityToken is CheckpointToken, Whitelist, Recoverable {
  using SafeMath for uint256; // We use only uint256 for safety reasons (no boxing)

  string public version = 'TM01 0.1';

  /** SecurityToken specific events **/
  event Issued(address indexed to, uint256 value);
  event Burned(address indexed burner, uint256 value);
  event Forced(address indexed from, address indexed to, uint256 value);
  event Announced(address indexed announcement, uint256 indexed announcementType, bytes32 indexed announcementName, bytes32 announcementURI, uint256 announcementHash);
  event UpdatedTokenInformation(string newName, string newSymbol);
  event UpdatedTransactionVerifier(address newVerifier);

  address[] public announcements;

  /**
   * @dev Contructor to create SecurityToken, and subsequent CheckpointToken.
   *
   * CheckpointToken will be created with hardcoded 18 decimals.
   *
   * @param _name Initial name of the token
   * @param _symbol Initial symbol of the token
   */
  function SecurityToken(string _name, string _symbol) CheckpointToken(_name, _symbol, 18) public {

  }

  /**
   * @dev Function to announce Announcements.
   *
   * Announcements can be for instance for dividend sharing, voting, or
   * just for general announcements.
   *
   * Instead of storing the announcement details, we just broadcast them as an
   * event, and store only the address.
   *
   * @param announcement Address of the Announcement
   */
  function announce(Announcement announcement) external onlyWhitelisted {
    announcements.push(announcement);
    Announced(address(announcement), announcement.announcementType(), announcement.announcementName(), announcement.announcementURI(), announcement.announcementHash());
  }

  /**
   * @dev Function to forcefully transfer tokens from A to B by board decission
   *
   * This must be implemented carefully, since this is a very critical part
   * to ensure investor safety.
   *
   * This is intended to be called by the BAC (The Board), hence the whitelisting.
   *
   * @param from Address of the account to confisticate the tokens from
   * @param to Address to deposit the confisticated token to
   * @param value amount of tokens to be confisticated
   */
  function forceTransfer(address from, address to, uint256 value) external onlyWhitelisted {
    transferInternal(from, to, value);

    Forced(from, to, value);
  }

  /**
   * @dev Issue new tokens to the board by a board decission
   *
   * Issue new tokens. This is intended to be called by the BAC (The Board),
   * hence the whitelisting.
   *
   * @param value Token amount to issue
   */
  function issueTokens(uint256 value) external onlyWhitelisted {
    address issuer = msg.sender;
    uint256 blackHoleBalance = balanceOf(address(0));
    uint256 totalSupplyNow = totalSupply();

    setCheckpoint(tokenBalances[address(0)], blackHoleBalance.add(value));
    transferInternal(address(0), issuer, value);
    setCheckpoint(tokensTotal, totalSupplyNow.add(value));

    Issued(issuer, value);
  }

  /**
   * @dev Burn tokens from contract's own balance by a board decission
   *
   * Burn tokens from contract's own balance to prevent accidental burnings.
   * This is intended to be called by the BAC (The Board), hence the whitelisting.
   *
   * @param value Token amount to burn from this contract's balance
   */
  function burnTokens(uint256 value) external onlyWhitelisted {
    address burner = address(this);
    uint256 burnerBalance = balanceOf(burner);
    uint256 totalSupplyNow = totalSupply();

    transferInternal(burner, address(0), value);
    setCheckpoint(tokenBalances[address(0)], burnerBalance.sub(value));
    setCheckpoint(tokensTotal, totalSupplyNow.sub(value));

    Burned(burner, value);
  }

  /**
   * @dev Whitelisted users (The Board, BAC) can update token information here.
   *
   * It is often useful to conceal the actual token association, until
   * the token operations, like central issuance or reissuance have been completed.
   *
   * This function allows the token owner to rename the token after the operations
   * have been completed and then point the audience to use the token contract.
   *
   * @param _name New name of the token
   * @param _symbol New symbol of the token
   */
  function setTokenInformation(string _name, string _symbol) external onlyWhitelisted {
    name = _name;
    symbol = _symbol;

    UpdatedTokenInformation(name, symbol);
  }

  /**
   * @dev Set transaction verifier
   *
   * This sets a SecurityTransferAgent to be used as a transaction verifier for
   * each transfer. This is implemented for possible regulatory requirements.
   *
   * @param newVerifier Address of the SecurityTransferAgent used as verifier
   */
  function setTransactionVerifier(SecurityTransferAgent newVerifier) external onlyWhitelisted {
    transferVerifier = newVerifier;

    UpdatedTransactionVerifier(newVerifier);
  }
}