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// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "./SafeMath.sol";


contract Deri {

    using SafeMath for uint256;

    event ChangeController(address oldController, address newController);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    event Transfer(address indexed from, address indexed to, uint256 amount);

    string public constant name = "Deri";

    string public constant symbol = "DERI";

    uint8 public constant decimals = 18;

    uint256 public maxSupply = 1_000_000_000e18; // 1 billion

    uint256 public totalSupply;

    address public controller;

    mapping (address => uint256) internal balances;

    mapping (address => mapping (address => uint256)) internal allowances;

    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    bytes32 public constant MINT_TYPEHASH = keccak256("Mint(address account,uint256 amount,uint256 nonce,uint256 deadline)");

    mapping (address => uint256) public nonces;

    constructor (address treasury) {
        uint256 treasuryAmount = 400_000_000e18; // 40% DERI into treasury
        totalSupply = treasuryAmount;
        balances[treasury] = treasuryAmount;
        emit Transfer(address(0), treasury, treasuryAmount);

        controller = msg.sender;
        emit ChangeController(address(0), controller);
    }

    // In order to prevent setting controller to an incorrect newController and forever lost the controll of this contract,
    // a signature of message keccak256(bytes(name)) from the newController must be provided.
    function setController(address newController, uint8 v, bytes32 r, bytes32 s) public {
        require(msg.sender == controller, "Deri.setController: only controller can set controller");
        require(v == 27 || v == 28, "Deri.setController: v not valid");
        bytes32 message = keccak256(bytes(name));
        bytes32 hash = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", message));
        address signatory = ecrecover(hash, v, r, s);
        require(signatory == newController, "Deri.setController: newController is not the signatory");

        emit ChangeController(controller, newController);
        controller = newController;
    }

    function balanceOf(address account) public view returns (uint256) {
        return balances[account];
    }

    function allowance(address owner, address spender) public view returns (uint256) {
        return allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public returns (bool) {
        require(spender != address(0), "Deri.approve: approve to zero address");
        allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transfer(address to, uint256 amount) public returns (bool) {
        require(to != address(0), "Deri.transfer: transfer to zero address");
        _transfer(msg.sender, to, amount);
        return true;
    }

    function transferFrom(address from, address to, uint256 amount) public returns (bool) {
        require(to != address(0), "Deri.transferFrom: transfer to zero address");

        uint256 oldAllowance = allowances[from][msg.sender];
        if (msg.sender != from && oldAllowance != uint256(-1)) {
            uint256 newAllowance = oldAllowance.sub(amount, "Deri.transferFrom: amount exceeds allowance");
            allowances[from][msg.sender] = newAllowance;
            emit Approval(from, msg.sender, newAllowance);
        }

        _transfer(from, to, amount);
        return true;
    }

    function mint(address account, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
        require(block.timestamp <= deadline, "Deri.mint: signature expired");

        bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name)), _getChainId(), address(this)));
        bytes32 structHash = keccak256(abi.encode(MINT_TYPEHASH, account, amount, nonces[account]++, deadline));
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
        address signatory = ecrecover(digest, v, r, s);
        require(signatory == controller, "Deri.mint: unauthorized");

        balances[account] = balances[account].add(amount);
        totalSupply = totalSupply.add(amount);

        require(totalSupply <= maxSupply, "Deri.mint: totalSupply exceeds maxSupply");
        emit Transfer(address(0), account, amount);
    }

    function _transfer(address from, address to, uint256 amount) internal {
        balances[from] = balances[from].sub(amount, "Deri._transfer: amount exceeds balance");
        balances[to] = balances[to].add(amount, "Deri._transfer: amount overflows");
        emit Transfer(from, to, amount);
    }

    function _getChainId() internal pure returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return add(a, b, "SafeMath: addition overflow");
    }

    function add(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return mul(a, b, "SafeMath: multiplication overflow");
    }

    function mul(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, errorMessage);

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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000000000000000000000000eb9f3ac220871dc050a033e8a31a00f49c604738

-----Decoded View---------------
Arg [0] : treasury (address): 0xEB9F3aC220871dC050A033e8a31a00f49c604738

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000eb9f3ac220871dc050a033e8a31a00f49c604738