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• library SafeMath
•    - function mul(uint a, uint b)
•    - function div(uint a, uint b)
•    - function sub(uint a, uint b)
•    - function add(uint a, uint b)
•    - function max64(uint64 a, uint64 b)
•    - function min64(uint64 a, uint64 b)
•    - function max256(uint a, uint b)
•    - function min256(uint a, uint b)
• interface GeneralERC20
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function balanceOf(address spender)
•    - function allowance(address owner, add ...
• library SafeERC20
•    - function checkSuccess()
•    - function transfer(address token, addr ...
•    - function transferFrom(address token, ...
•    - function approve(address token, addre ...
•  contract ADXToken *
•    - function balanceOf(address owner)
•    - function transfer(address to, uint am ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function allowance(address owner, add ...
•    - function innerMint(address owner, uin ...
•    - function mint(address owner, uint amo ...
•    - function changeSupplyController(addre ...
•    - function swap(uint prevTokenAmount)

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/**
 *Submitted for verification at Etherscan.io on 2020-08-03
*/

pragma solidity ^0.6.12;
// SPDX-License-Identifier: agpl-3.0

library SafeMath {

    function mul(uint a, uint b) internal pure returns (uint) {
        uint c = a * b;
        require(a == 0 || c / a == b);
        return c;
    }

    function div(uint a, uint b) internal pure returns (uint) {
        require(b > 0);
        uint c = a / b;
        require(a == b * c + a % b);
        return c;
    }

    function sub(uint a, uint b) internal pure returns (uint) {
        require(b <= a);
        return a - b;
    }

    function add(uint a, uint b) internal pure returns (uint) {
        uint c = a + b;
        require(c >= a);
        return c;
    }

    function max64(uint64 a, uint64 b) internal pure returns (uint64) {
        return a >= b ? a : b;
    }

    function min64(uint64 a, uint64 b) internal pure returns (uint64) {
        return a < b ? a : b;
    }

    function max256(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }

    function min256(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
}

// NOTE: this interface lacks return values for transfer/transferFrom/approve on purpose,
// as we use the SafeERC20 library to check the return value
interface GeneralERC20 {
	function transfer(address to, uint256 amount) external;
	function transferFrom(address from, address to, uint256 amount) external;
	function approve(address spender, uint256 amount) external;
	function balanceOf(address spender) external view returns (uint);
	function allowance(address owner, address spender) external view returns (uint);
}

library SafeERC20 {
	function checkSuccess()
		private
		pure
		returns (bool)
	{
		uint256 returnValue = 0;

		assembly {
			// check number of bytes returned from last function call
			switch returndatasize()

			// no bytes returned: assume success
			case 0x0 {
				returnValue := 1
			}

			// 32 bytes returned: check if non-zero
			case 0x20 {
				// copy 32 bytes into scratch space
				returndatacopy(0x0, 0x0, 0x20)

				// load those bytes into returnValue
				returnValue := mload(0x0)
			}

			// not sure what was returned: don't mark as success
			default { }
		}

		return returnValue != 0;
	}

	function transfer(address token, address to, uint256 amount) internal {
		GeneralERC20(token).transfer(to, amount);
		require(checkSuccess());
	}

	function transferFrom(address token, address from, address to, uint256 amount) internal {
		GeneralERC20(token).transferFrom(from, to, amount);
		require(checkSuccess());
	}

	function approve(address token, address spender, uint256 amount) internal {
		GeneralERC20(token).approve(spender, amount);
		require(checkSuccess());
	}
}

contract ADXToken {
	using SafeMath for uint;

	// Constants
	string public constant name = "AdEx Network";
	string public constant symbol = "ADX";
	uint8 public constant decimals = 18;

	// Mutable variables
	uint public totalSupply;
	mapping(address => uint) balances;
	mapping(address => mapping(address => uint)) allowed;

	event Approval(address indexed owner, address indexed spender, uint amount);
	event Transfer(address indexed from, address indexed to, uint amount);

	address public supplyController;
	address public immutable PREV_TOKEN;

	constructor(address supplyControllerAddr, address prevTokenAddr) public {
		supplyController = supplyControllerAddr;
		PREV_TOKEN = prevTokenAddr;
	}

	function balanceOf(address owner) external view returns (uint balance) {
		return balances[owner];
	}

	function transfer(address to, uint amount) external returns (bool success) {
		balances[msg.sender] = balances[msg.sender].sub(amount);
		balances[to] = balances[to].add(amount);
		emit Transfer(msg.sender, to, amount);
		return true;
	}

	function transferFrom(address from, address to, uint amount) external returns (bool success) {
		balances[from] = balances[from].sub(amount);
		allowed[from][msg.sender] = allowed[from][msg.sender].sub(amount);
		balances[to] = balances[to].add(amount);
		emit Transfer(from, to, amount);
		return true;
	}

	function approve(address spender, uint amount) external returns (bool success) {
		allowed[msg.sender][spender] = amount;
		emit Approval(msg.sender, spender, amount);
		return true;
	}

	function allowance(address owner, address spender) external view returns (uint remaining) {
		return allowed[owner][spender];
	}

	// Supply control
	function innerMint(address owner, uint amount) internal {
		totalSupply = totalSupply.add(amount);
		balances[owner] = balances[owner].add(amount);
		// Because of https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md#transfer-1
		emit Transfer(address(0), owner, amount);
	}

	function mint(address owner, uint amount) external {
		require(msg.sender == supplyController, 'NOT_SUPPLYCONTROLLER');
		innerMint(owner, amount);
	}

	function changeSupplyController(address newSupplyController) external {
		require(msg.sender == supplyController, 'NOT_SUPPLYCONTROLLER');
		supplyController = newSupplyController;
	}

	// Swapping: multiplier is 10**(18-4)
	// NOTE: Burning by sending to 0x00 is not possible with many ERC20 implementations, but this one is made specifically for the old ADX
	uint constant PREV_TO_CURRENT_TOKEN_MULTIPLIER = 100000000000000;
	function swap(uint prevTokenAmount) external {
		innerMint(msg.sender, prevTokenAmount.mul(PREV_TO_CURRENT_TOKEN_MULTIPLIER));
		SafeERC20.transferFrom(PREV_TOKEN, msg.sender, address(0), prevTokenAmount);
	}
}

• Forkway ltd - July 31st, 2020 - Security Audit Report

[{"inputs":[{"internalType":"address","name":"supplyControllerAddr","type":"address"},{"internalType":"address","name":"prevTokenAddr","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"PREV_TOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"remaining","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newSupplyController","type":"address"}],"name":"changeSupplyController","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"supplyController","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"prevTokenAmount","type":"uint256"}],"name":"swap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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00000000000000000000000004918f1071594af602f937f6a444b5f5787786ed0000000000000000000000004470bb87d77b963a013db939be332f927f2b992e

-----Decoded View---------------
Arg [0] : supplyControllerAddr (address): 0x04918f1071594aF602F937F6a444B5F5787786ed
Arg [1] : prevTokenAddr (address): 0x4470BB87d77b963A013DB939BE332f927f2b992e

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000004918f1071594af602f937f6a444b5f5787786ed
Arg [1] : 0000000000000000000000004470bb87d77b963a013db939be332f927f2b992e

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