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pragma solidity ^0.4.24;

// File: openzeppelin-solidity/contracts/access/rbac/Roles.sol

/**

@title Roles
@author Francisco Giordano (@frangio)
@dev Library for managing addresses assigned to a Role.
See RBAC.sol for example usage. */ library Roles { struct Role { mapping (address => bool) bearer; }

/**

@dev give an address access to this role */ function add(Role storage _role, address _addr) internal { _role.bearer[_addr] = true; }

/**

@dev remove an address' access to this role */ function remove(Role storage _role, address _addr) internal { _role.bearer[_addr] = false; }

/**

@dev check if an address has this role
// reverts */ function check(Role storage _role, address _addr) internal view { require(has(_role, _addr)); }

/**

@dev check if an address has this role
@return bool */ function has(Role storage _role, address _addr) internal view returns (bool) { return _role.bearer[_addr]; } }

// File: openzeppelin-solidity/contracts/access/rbac/RBAC.sol

/**

@title RBAC (Role-Based Access Control)
@author Matt Condon (@Shrugs)
@dev Stores and provides setters and getters for roles and addresses.
Supports unlimited numbers of roles and addresses.
See //contracts/mocks/RBACMock.sol for an example of usage.
This RBAC method uses strings to key roles. It may be beneficial
for you to write your own implementation of this interface using Enums or similar. */ contract RBAC { using Roles for Roles.Role;

mapping (string => Roles.Role) private roles;

event RoleAdded(address indexed operator, string role); event RoleRemoved(address indexed operator, string role);

/**

@dev reverts if addr does not have role
@param _operator address
@param _role the name of the role
// reverts */ function checkRole(address _operator, string _role) public view { roles[_role].check(_operator); }

/**

@dev determine if addr has role
@param _operator address
@param _role the name of the role
@return bool */ function hasRole(address _operator, string _role) public view returns (bool) { return roles[_role].has(_operator); }

/**

@dev add a role to an address
@param _operator address
@param _role the name of the role */ function addRole(address _operator, string _role) internal { roles[_role].add(_operator); emit RoleAdded(_operator, _role); }

/**

@dev remove a role from an address
@param _operator address
@param _role the name of the role */ function removeRole(address _operator, string _role) internal { roles[_role].remove(_operator); emit RoleRemoved(_operator, _role); }

/**

@dev modifier to scope access to a single role (uses msg.sender as addr)
@param _role the name of the role
// reverts */ modifier onlyRole(string _role) { checkRole(msg.sender, _role); _; }

/**

@dev modifier to scope access to a set of roles (uses msg.sender as addr)
@param _roles the names of the roles to scope access to
// reverts
@TODO - when solidity supports dynamic arrays as arguments to modifiers, provide this
see: ethereum/solidity#2467 */ // modifier onlyRoles(string[] _roles) { // bool hasAnyRole = false; // for (uint8 i = 0; i < _roles.length; i++) { // if (hasRole(msg.sender, _roles[i])) { // hasAnyRole = true; // break; // } // }

// require(hasAnyRole);

// _; // } }

// File: openzeppelin-solidity/contracts/math/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 c) { // Gas optimization: this is cheaper than asserting 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: OpenZeppelin/openzeppelin-contracts#522 if (_a == 0) { return 0; }

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 _a / _b; }

/**

@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 c) { c = _a + _b; assert(c >= _a); return c; } }

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol

/**

@title ERC20Basic
@dev Simpler version of ERC20 interface
See ethereum/EIPs#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); }

// File: openzeppelin-solidity/contracts/token/ERC20/BasicToken.sol

/**

@title Basic token
@dev Basic version of StandardToken, with no allowances. */ contract BasicToken is ERC20Basic { using SafeMath for uint256;

mapping(address => uint256) internal balances;

uint256 internal 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(_value <= balances[msg.sender]); require(_to != address(0));

balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(_value); emit Transfer(msg.sender, _to, _value); return true; }

/**

@dev Gets the balance of the specified address.
@param _owner The address to query the the balance of.
@return An uint256 representing the amount owned by the passed address. */ function balanceOf(address _owner) public view returns (uint256) { return balances[_owner]; }

}

// File: openzeppelin-solidity/contracts/token/ERC20/BurnableToken.sol

/**

@title Burnable Token
@dev Token that can be irreversibly burned (destroyed). */ contract BurnableToken is BasicToken {

event Burn(address indexed burner, uint256 value);

/**

@dev Burns a specific amount of tokens.
@param _value The amount of token to be burned. */ function burn(uint256 _value) public { _burn(msg.sender, _value); }

function _burn(address _who, uint256 _value) internal { require(_value <= balances[_who]); // no need to require value <= totalSupply, since that would imply the // sender's balance is greater than the totalSupply, which should be an assertion failure

balances[_who] = balances[_who].sub(_value);
totalSupply_ = totalSupply_.sub(_value);
emit Burn(_who, _value);
emit Transfer(_who, address(0), _value);

} }

// File: openzeppelin-solidity/contracts/ownership/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 OwnershipRenounced(address indexed previousOwner); event OwnershipTransferred( address indexed previousOwner, address indexed newOwner );

/**

@dev The Ownable constructor sets the original owner of the contract to the sender
account. */ constructor() 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 relinquish control of the contract.
@notice Renouncing to ownership will leave the contract without an owner.
It will not be possible to call the functions with the onlyOwner
modifier anymore. */ function renounceOwnership() public onlyOwner { emit OwnershipRenounced(owner); owner = address(0); }

/**

@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 { _transferOwnership(_newOwner); }

/**

@dev Transfers control of the contract to a newOwner.
@param _newOwner The address to transfer ownership to. */ function _transferOwnership(address _newOwner) internal { require(_newOwner != address(0)); emit OwnershipTransferred(owner, _newOwner); owner = _newOwner; } }

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

/**

@title ERC20 interface
@dev see ethereum/EIPs#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 ); }

// File: openzeppelin-solidity/contracts/token/ERC20/StandardToken.sol

/**

@title Standard ERC20 token
@dev Implementation of the basic standard token.
ethereum/EIPs#20
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(_value <= balances[_from]); require(_value <= allowed[_from][msg.sender]); require(_to != address(0));

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 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:
ethereum/EIPs#20 (comment)
@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; emit 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, 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) { uint256 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: openzeppelin-solidity/contracts/token/ERC20/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 StandardToken, Ownable { event Mint(address indexed to, uint256 amount); event MintFinished();

bool public mintingFinished = false;

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

modifier hasMintPermission() { require(msg.sender == owner); _; }

/**

@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 ) public hasMintPermission canMint returns (bool) { 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() public onlyOwner canMint returns (bool) { mintingFinished = true; emit MintFinished(); return true; } }

// File: contracts/COE.sol

contract COE is MintableToken, BurnableToken, RBAC { using SafeMath for uint256;

string public constant name = "CoinMarketCap Coeval by Synthchain"; string public constant symbol = "CMC-COE"; uint8 public constant decimals = 18;

// this variable represents the total amount of eth raised uint public ethRaised = 58124022054610641246;

string public constant ROLE_WHITELISTED = "whitelist"; string public constant ROLE_ADMIN = "admin"; string public constant ROLE_SUPER = "super";

uint public swapLimit; uint public constant CYCLE_CAP = 100000 * (10 ** uint256(decimals)); uint public constant BILLION = 10 ** 9;

event SwapStarted(uint256 startTime); event MiningRestart(uint256 endTime); event CMCUpdate(string updateType, uint value);

uint offset = 10**18; // these rates are offset. divide by 1e18 to get actual rate. uint public exchangeRateMNY; uint public exchangeRateFUTX;

//initial state uint public cycleMintSupply = 0; bool public isMiningOpen = false; uint public CMC = 236346228108; uint public cycleEndTime;

address public constant ZUR = 0x3A4b527dcd618cCea50aDb32B3369117e5442A2F; address public constant MNY = 0xD2354AcF1a2f06D69D8BC2e2048AaBD404445DF6; address public constant FUTX = 0x8b7d07b6ffB9364e97B89cEA8b84F94249bE459F;

constructor() public { //only the contract itself can mint as the owner owner = this; totalSupply_ = 0; addRole(msg.sender, ROLE_ADMIN); addRole(msg.sender, ROLE_SUPER); addRole(msg.sender, ROLE_WHITELISTED);

// initial market data to set rates.
exchangeRateMNY = offset.mul(offset).div(CMC.mul(offset).div(BILLION)).mul(65).div(100);
exchangeRateFUTX = offset.mul(offset).div(uint(29997535964).mul(offset).div(uint(123943034521)).mul(CMC).div(BILLION)).mul(65).div(100);

}

function () external payable { buyTokens(msg.sender); }

function donateEth() external payable { //thanks! this will add to the swap back amount. ethRaised += msg.value; }

uint public presaleFee = 0; uint8 public presaleLevel = 11; uint public coePerEthOffset = offset.div(presaleLevel).mul(650); bool public presaleOpen = true; uint public ethRateExpiration = now + 1 days; uint public coeRemainingAtCurrentRate = 715997995035396254194;

function startPresale() onlyAdmin public { require(!presaleOpen && presaleLevel == 1); ethRateExpiration = now + 1 days; presaleOpen = true; }

function buyTokens(address _beneficiary) public payable { require(presaleOpen); require(msg.value > 0); ethRaised += msg.value; uint buyingPower = msg.value; presaleFee += buyingPower.mul(65).div(100); uint tokens = 0; uint zurFeed = 0;

if (now > ethRateExpiration) {
  incrementLevel(buyingPower);
}

while(buyingPower > 0) {
  uint ethToFillLevel = coeRemainingAtCurrentRate.mul(65).div(100).mul(offset).div(coePerEthOffset);
  if (buyingPower >= ethToFillLevel) {
    buyingPower -= ethToFillLevel;
    tokens += coeRemainingAtCurrentRate.mul(65).div(100);
    zurFeed += coeRemainingAtCurrentRate.mul(35).div(100);
    coeRemainingAtCurrentRate = 0;
  } else {
    tokens += buyingPower.mul(coePerEthOffset).div(offset);
    zurFeed += buyingPower.mul(coePerEthOffset).div(offset).mul(35).div(65);
    coeRemainingAtCurrentRate = coeRemainingAtCurrentRate.sub(buyingPower.mul(coePerEthOffset).mul(100).div(65).div(offset));
    buyingPower = 0;
  }

  if (coeRemainingAtCurrentRate == 0) {
    incrementLevel(buyingPower);

    if (!presaleOpen) {
      // round any leftover dust to last buyer
      tokens += (CYCLE_CAP - cycleMintSupply - tokens - zurFeed);
      break;
    }
  }
}

cycleMintSupply += (tokens + zurFeed);
if (!presaleOpen) {
  // start swap
  _startSwap();
}
MintableToken(this).mint(_beneficiary, tokens);
MintableToken(this).mint(ZUR, zurFeed);

}

modifier canMine() { require(isMiningOpen); _; }

// first call (mny address).approve(coe address, amount) for COE to transfer on your behalf. function mine(uint amount) canMine public { require(amount > 0); require(cycleMintSupply < CYCLE_CAP); require(ERC20(MNY).transferFrom(msg.sender, address(this), amount));

uint refund = _mine(exchangeRateMNY, amount);
if(refund > 0) {
  ERC20(MNY).transfer(msg.sender, refund);
}
if (cycleMintSupply == CYCLE_CAP) {
  //start swap
  _startSwap();
}

}

// first call (futx address).approve(coe address, amount) for COE to transfer on your behalf. function whitelistMine(uint amount) canMine onlyIfWhitelisted public { require(amount > 0); require(cycleMintSupply < CYCLE_CAP); require(ERC20(FUTX).transferFrom(msg.sender, address(this), amount));

uint refund = _mine(exchangeRateFUTX, amount);
if(refund > 0) {
  ERC20(FUTX).transfer(msg.sender, refund);
}
if (cycleMintSupply == CYCLE_CAP) {
  //start swap
  _startSwap();
}

}

function _mine(uint _rate, uint _inAmount) private returns (uint) { assert(_rate > 0);

// took too long; return tokens and start swap.
if (now > cycleEndTime && cycleMintSupply > 0) {
  _startSwap();
  return _inAmount;
}
uint tokens = _rate.mul(_inAmount).div(offset);
uint refund = 0;

// for every 65 tokens mined, we mine 35 for the zur contract.
uint zurFeed = tokens.mul(35).div(65);

if (tokens + zurFeed + cycleMintSupply > CYCLE_CAP) {
  uint overage = tokens + zurFeed + cycleMintSupply - CYCLE_CAP;
  uint tokenOverage = overage.mul(65).div(100);
  zurFeed -= (overage - tokenOverage);
  tokens -= tokenOverage;

  // refund token overage
  refund = tokenOverage.mul(offset).div(_rate);
}
cycleMintSupply += (tokens + zurFeed);
require(zurFeed > 0, "Mining payment too small.");
MintableToken(this).mint(msg.sender, tokens);
MintableToken(this).mint(ZUR, zurFeed);

return refund;

}

// swap data bool public swapOpen = false; uint public ethSwapRate; mapping(address => uint) public swapRates;

function _startSwap() private { swapOpen = true; isMiningOpen = false;

// set swap rates
// 35% of holdings split among a number equal to 35% of newly minted coe
swapLimit = cycleMintSupply.mul(35).div(100);
ethSwapRate = (address(this).balance.sub(presaleFee)).mul(offset).mul(35).div(100).div(swapLimit);
swapRates[FUTX] = ERC20(FUTX).balanceOf(address(this)).mul(offset).mul(35).div(100).div(swapLimit);
swapRates[MNY] = ERC20(MNY).balanceOf(address(this)).mul(offset).mul(35).div(100).div(swapLimit);

emit SwapStarted(now);

}

function swap(uint amt) public { require(swapOpen && swapLimit > 0); if (amt > swapLimit) { amt = swapLimit; } swapLimit -= amt; // burn verifies msg.sender has balance burn(amt);

if (amt.mul(ethSwapRate) > 0) {
  msg.sender.transfer(amt.mul(ethSwapRate).div(offset));
}

if (amt.mul(swapRates[FUTX]) > 0) {
  ERC20(FUTX).transfer(msg.sender, amt.mul(swapRates[FUTX]).div(offset));
}

if (amt.mul(swapRates[MNY]) > 0) {
  ERC20(MNY).transfer(msg.sender, amt.mul(swapRates[MNY]).div(offset));
}

if (swapLimit == 0) {
  _restart();
}

}

function _restart() private { require(swapOpen); require(swapLimit == 0);

cycleMintSupply = 0;
swapOpen = false;
isMiningOpen = true;
cycleEndTime = now + 100 days;

emit MiningRestart(cycleEndTime);

}

function updateCMC(uint _cmc) private { require(_cmc > 0); CMC = _cmc; emit CMCUpdate("TOTAL_CMC", _cmc); exchangeRateMNY = offset.mul(offset).div(CMC.mul(offset).div(BILLION)).mul(65).div(100); }

function updateCMC(uint _cmc, uint _btc, uint _eth) public onlyAdmin{ require(_btc > 0 && _eth > 0); updateCMC(_cmc); emit CMCUpdate("BTC_CMC", _btc); emit CMCUpdate("ETH_CMC", _eth); exchangeRateFUTX = offset.mul(offset).div(_eth.mul(offset).div(_btc).mul(CMC).div(BILLION)).mul(65).div(100); }

modifier onlyIfWhitelisted() { checkRole(msg.sender, ROLE_WHITELISTED); _; }

modifier onlySuper() { checkRole(msg.sender, ROLE_SUPER); _; }

modifier onlyAdmin() { checkRole(msg.sender, ROLE_ADMIN); _; }

function addAdmin(address _addr) public onlySuper { addRole(_addr, ROLE_ADMIN); }

function removeAdmin(address _addr) public onlySuper { removeRole(_addr, ROLE_ADMIN); }

function changeSuper(address _addr) public onlySuper { addRole(_addr, ROLE_SUPER); removeRole(msg.sender, ROLE_SUPER); }

function addAddressToWhitelist(address _operator) public onlySuper { addRole(_operator, ROLE_WHITELISTED); }

function whitelist(address _operator) public view returns (bool) { return hasRole(_operator, ROLE_WHITELISTED); }

function addAddressesToWhitelist(address[] _operators) public onlySuper { for (uint256 i = 0; i < _operators.length; i++) { addAddressToWhitelist(_operators[i]); } }

function removeAddressFromWhitelist(address _operator) public onlySuper { removeRole(_operator, ROLE_WHITELISTED); }

function removeAddressesFromWhitelist(address[] _operators) public onlySuper { for (uint256 i = 0; i < _operators.length; i++) { removeAddressFromWhitelist(_operators[i]); } }

// redistribute from previous contract bool public distributing = true;

function endDistribution() onlySuper public { distributing = false; }

function distribute(address _payee, uint _amt) onlySuper public { require(_payee != address(0)); require(distributing); cycleMintSupply += _amt; MintableToken(this).mint(_payee, _amt); }

function distributeList(address[] _payees, uint[] _amts) onlySuper external { require(_payees.length == _amts.length); require(_payees.length > 0);

for (uint i = 0; i < _payees.length; i++) {
  distribute(_payees[i], _amts[i]);
}

}

function payFees() public { require(presaleFee > 0); uint feeShare = presaleFee.div(13); if (feeShare > 0) { address(0x17F619855432168f2aB5A1B2133888d9ffCC3946).transfer(feeShare); address(0xAaf47A27BBd9B82ee0f1f77C7b437A36160c4242).transfer(feeShare * 4); address(0x38eEE50cd8FAB1426C2c5baCF9b1C2A3740c024B).transfer(feeShare * 4); address(0x5d2b9f5345e69E2390cE4C26ccc9C2910A097520).transfer(feeShare); address(0xcf5Ee528278a57Ba087684f685D99A6a5EC4c439).transfer(feeShare * 3); } presaleFee = 0; } }

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