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•  contract Ownable
•    - function transferOwnership(address ne ...
• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)
•  contract ERC20Interface
•    - function totalSupply()
•    - function balanceOf(address who)
•    - function transfer(address to, uint256 ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•    - function allowance(address owner, add ...
•  contract BaseToken is ERC20Interfa ...
•    - function totalSupply()
•    - function balanceOf(address _owner)
•    - function transfer(address _to, uint25 ...
•    - function approve(address _spender, ui ...
•    - function transferFrom(address _from, ...
•    - function allowance(address _owner, ad ...
•    - function increaseApproval(address _sp ...
•    - function decreaseApproval(address _sp ...
•  contract MintableToken is BaseToke ...
•    - function mint(address _to, uint256 _a ...
•    - function finishMinting()
•  contract CappedToken is MintableTo ...
•    - function mint(address _to, uint256 _a ...
•  contract Pausable is Ownable
•    - function pause()
•    - function unpause()
•  contract PausableToken is BaseToke ...
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function increaseApproval(address _sp ...
•    - function decreaseApproval(address _sp ...
•  contract SignedTransferToken is Ba ...
•    - function transferPreSigned(address _f ...
•    - function transferPreSignedBulk(addres ...
•    - function calculateHash(address _from, ...
•    - function isValidSignature(address _si ...
•    - function isTransactionAlreadySettled( ...
•  contract PausableSignedTransferTok ...
•    - function transferPreSigned(address _f ...
•    - function transferPreSignedBulk(addres ...
•  contract ElesToken is CappedToken, ... *
•    - function recoverERC20Tokens(address _ ...

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/**
 *Submitted for verification at Etherscan.io on 2018-08-24
*/

pragma solidity ^0.4.23;

// File: contracts/helpers/Ownable.sol

/**
 * @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 Constructor sets the original owner of the contract to the
  * sender account.
  */
  constructor() public {
    owner = msg.sender;
  }

  /**
  * @dev Throws if called by any other account other than 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));
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: contracts/helpers/SafeMath.sol

/**
 * @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;
  }

}

// File: contracts/token/ERC20Interface.sol

contract ERC20Interface {

  event Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);

  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function allowance(address owner, address spender) public view returns (uint256);

}

// File: contracts/token/BaseToken.sol

contract BaseToken is ERC20Interface {
  using SafeMath for uint256;

  mapping(address => uint256) balances;
  mapping (address => mapping (address => uint256)) internal allowed;

  uint256 totalSupply_;

  /**
  * @dev Obtain total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @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];
  }

  /**
  * @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 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) {
    require(_spender != address(0));

    allowed[msg.sender][_spender] = _value;
    emit 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
   */
  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);

    emit Transfer(_from, _to, _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, uint256 _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    emit 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, uint256 _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);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: contracts/token/MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is BaseToken, Ownable {

  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;

  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    require(_to != address(0));

    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }

}

// File: contracts/token/CappedToken.sol

contract CappedToken is MintableToken {

  uint256 public cap;

  constructor(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    require(totalSupply_.add(_amount) <= cap);

    return super.mint(_to, _amount);
  }

}

// File: contracts/helpers/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;

  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    emit Unpause();
  }

}

// File: contracts/token/PausableToken.sol

/**
 * @title Pausable token
 * @dev BaseToken modified with pausable transfers.
 **/
contract PausableToken is BaseToken, Pausable {

  function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transferFrom(_from, _to, _value);
  }

  function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
    return super.approve(_spender, _value);
  }

  function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
    return super.increaseApproval(_spender, _addedValue);
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
    return super.decreaseApproval(_spender, _subtractedValue);
  }
}

// File: contracts/token/SignedTransferToken.sol

/**
* @title SignedTransferToken
* @dev The SignedTransferToken enables collection of fees for token transfers
* in native token currency. User will provide a signature that allows the third
* party to settle the transaction in his name and collect fee for provided
* serivce.
*/
contract SignedTransferToken is BaseToken {

  event TransferPreSigned(
    address indexed from,
    address indexed to,
    address indexed settler,
    uint256 value,
    uint256 fee
  );


  // Mapping of already executed settlements for a given address
  mapping(address => mapping(bytes32 => bool)) internal executedSettlements;

  /**
  * @dev Will settle a pre-signed transfer
  */
  function transferPreSigned(address _from,
                             address _to,
                             uint256 _value,
                             uint256 _fee,
                             uint256 _nonce,
                             uint8 _v,
                             bytes32 _r,
                             bytes32 _s) public returns (bool) {
    uint256 total = _value.add(_fee);
    bytes32 calcHash = calculateHash(_from, _to, _value, _fee, _nonce);

    require(_to != address(0));
    require(isValidSignature(_from, calcHash, _v, _r, _s));
    require(balances[_from] >= total);
    require(!executedSettlements[_from][calcHash]);

    executedSettlements[_from][calcHash] = true;

    // Move tokens
    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(_from, _to, _value);

    // Move fee
    balances[_from] = balances[_from].sub(_fee);
    balances[msg.sender] = balances[msg.sender].add(_fee);
    emit Transfer(_from, msg.sender, _fee);

    emit TransferPreSigned(_from, _to, msg.sender, _value, _fee);

    return true;
  }

  /**
  * @dev Settle multiple transactions in a single call. Please note that
  * should a single one fail the full state will be reverted. Your client
  * implementation should always first check for balances, correct signatures
  * and any other conditions that might result in failed transaction.
  */
  function transferPreSignedBulk(address[] _from,
                                 address[] _to,
                                 uint256[] _values,
                                 uint256[] _fees,
                                 uint256[] _nonces,
                                 uint8[] _v,
                                 bytes32[] _r,
                                 bytes32[] _s) public returns (bool) {
    // Make sure all the arrays are of the same length
    require(_from.length == _to.length &&
            _to.length ==_values.length &&
            _values.length == _fees.length &&
            _fees.length == _nonces.length &&
            _nonces.length == _v.length &&
            _v.length == _r.length &&
            _r.length == _s.length);

    for(uint i; i < _from.length; i++) {
      transferPreSigned(_from[i],
                        _to[i],
                        _values[i],
                        _fees[i],
                        _nonces[i],
                        _v[i],
                        _r[i],
                        _s[i]);
    }

    return true;
  }

  /**
  * @dev Calculates transfer hash.
  */
  function calculateHash(address _from, address _to, uint256 _value, uint256 _fee, uint256 _nonce) public view returns (bytes32) {
    return keccak256(abi.encodePacked(uint256(0), address(this), _from, _to, _value, _fee, _nonce));
  }

  /**
  * @dev Validates the signature
  */
  function isValidSignature(address _signer, bytes32 _hash, uint8 _v, bytes32 _r, bytes32 _s) public pure returns (bool) {
    return _signer == ecrecover(
            keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", _hash)),
            _v,
            _r,
            _s
        );
  }

  /**
  * @dev Allows you to check whether a certain transaction has been already
  * settled or not.
  */
  function isTransactionAlreadySettled(address _from, bytes32 _calcHash) public view returns (bool) {
    return executedSettlements[_from][_calcHash];
  }

}

// File: contracts/token/PausableSignedTransferToken.sol

contract PausableSignedTransferToken is SignedTransferToken, PausableToken {

  function transferPreSigned(address _from,
                             address _to,
                             uint256 _value,
                             uint256 _fee,
                             uint256 _nonce,
                             uint8 _v,
                             bytes32 _r,
                             bytes32 _s) public whenNotPaused returns (bool) {
    return super.transferPreSigned(_from, _to, _value, _fee, _nonce, _v, _r, _s);
  }

  function transferPreSignedBulk(address[] _from,
                                 address[] _to,
                                 uint256[] _values,
                                 uint256[] _fees,
                                 uint256[] _nonces,
                                 uint8[] _v,
                                 bytes32[] _r,
                                 bytes32[] _s) public whenNotPaused returns (bool) {
    return super.transferPreSignedBulk(_from, _to, _values, _fees, _nonces, _v, _r, _s);
  }

}

// File: contracts/ElesToken.sol

contract ElesToken is CappedToken, PausableSignedTransferToken  {
  string public name = 'Elements Estates Token';
  string public symbol = 'ELES';
  uint256 public decimals = 18;


  // Max supply of 250 million
  uint256 internal maxSupply = 250000000 * 10**decimals;

  constructor()
   CappedToken(maxSupply) public {
      paused = true;
  }

  // @dev Recover any mistakenly sent ERC20 tokens to the Token address
  function recoverERC20Tokens(address _erc20, uint256 _amount) public onlyOwner {
    ERC20Interface(_erc20).transfer(msg.sender, _amount);
  }

}

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