Contract 0xA2cd3D43c775978A96BdBf12d733D5A1ED94fb18 6

 

Contract Overview

Chain: XCN Token
Balance:
0 Ether

EtherValue:
$0.00

Token:
Txn Hash
Method
Block
From
To
Value
0x64e9ee3677d880ffa86882c6afc26f238c7efa03735c826f803cf5c48caa2449Transfer156135312022-09-25 23:00:2326 mins ago0xaa3d696c5a339adb8c7b9a673b1a8b4181473202 IN  Chain: XCN Token0 Ether0.00021466 6.29038362
0x2b64eab3bed02d345fa2c5e800c48f7652899f9564052c33fc5313e26c431e2bTransfer156135312022-09-25 23:00:2326 mins ago0x01e9c5fe01924a09604199fd10cd3ec907dd2445 IN  Chain: XCN Token0 Ether0.00021466 6.29038362
0x6392a7b524ccb9fa43462bb20927171f9cf1274581f0603c636a70f435ec6b1dTransfer156134312022-09-25 22:40:2346 mins ago0x3ae32cfc865fb7ca7a8e1b3011dc77dad36dd2b2 IN  Chain: XCN Token0 Ether0.00023468 6.87714555
0x3ff7c997b06bda5c7c18d6164855d014ab92f40cbc2746b0128383de7b4071c0Transfer156131342022-09-25 21:40:231 hr 46 mins ago0x824b8d12c73fb7d66f981f71fa061ddf2c4af286 IN  Chain: XCN Token0 Ether0.00042883 12.5662241
0xd3f933bf12ebb1f806b7d57cca6b83727727d2e302a55f45e9771d7fdcefabd0Transfer156130712022-09-25 21:27:351 hr 59 mins agoBittrex IN  Chain: XCN Token0 Ether0.0016807830
0x1f420969750d4e96bfbee0f324150c6d3b1685a53f93ee874a1555233e741360Transfer156129622022-09-25 21:05:472 hrs 21 mins ago0x30741289523c2e4d2a62c7d6722686d14e723851 IN  Chain: XCN Token0 Ether0.0011207620
0xf8df1de6b62d8fef90dd0cdd35cb85da2c9366e83eb9e380ccc7947b2726f445Transfer156129322022-09-25 20:59:472 hrs 27 mins ago0x4ab972d90f731131ee06228c62e23de29b9450f1 IN  Chain: XCN Token0 Ether0.0005251815.3896856
0xa8b427caa65cbeefd118009a758bf8f36b44d5b7835192dd9602912b926f57d6Approve156128672022-09-25 20:46:232 hrs 40 mins ago0x75c238809f0a6d33bed369dfad6b251dfad23730 IN  Chain: XCN Token0 Ether0.00046503 10
0x5143282c2cfcb3c8aed7fc13fe6b7fd9ef399d30266f0edd012ae3adb1e958b8Transfer156128412022-09-25 20:41:112 hrs 46 mins agoBittrex IN  Chain: XCN Token0 Ether0.0016807830
0xa5e8980d7d6fe6c2321f3d1dd8f36f1203e4112259a0f9d481578576b3831f46Transfer156127642022-09-25 20:25:353 hrs 1 min ago0x65f4634430d3800443287add72e81bdbefa2a2ce IN  Chain: XCN Token0 Ether0.00040282 7.86366671
0x933170a7ab37c58e486f1448aab50615a1e013962d6f9205713377b0e2ac52d2Approve156126262022-09-25 19:57:593 hrs 29 mins ago0xc3cd0d327a428699b9181159d988c458894b6ced IN  Chain: XCN Token0 Ether0.00035678 7.67220137
0xbf910c56473b743c2ee419cceebcb867136a425b08fcddeec9b97f7bbe381853Transfer156124632022-09-25 19:25:114 hrs 2 mins ago0x6f9fdf224d469d9b37cc755d84ab5a2767c665cd IN  Chain: XCN Token0 Ether0.00023481 6.88080675
0xae72cbc83e152b081d9f331988d5e6599ac8c121cf0a2d70fd3801582fd70d1dTransfer156124632022-09-25 19:25:114 hrs 2 mins ago0xb743c048df0c86af97bebd61866720c37ee9a80a IN  Chain: XCN Token0 Ether0.00023481 6.88080675
0xd1f5f1e8c38ed2ba054a9613744d4daec2f78d4989f591af640940df3cd9b053Transfer156124632022-09-25 19:25:114 hrs 2 mins ago0x8287d40f6a267f502b76a9d07be9dc2d9a5e346f IN  Chain: XCN Token0 Ether0.00023481 6.88080675
0x7c782e9ab716babe765b69319b5070e8f406ba864ae4395c1ef82395ccf90d88Transfer156119582022-09-25 17:43:475 hrs 43 mins ago0x0e098207a163a0f8415d575cb5126ebf378f00bf IN  Chain: XCN Token0 Ether0.00028128 8.23670164
0x3aaf305ea6e920d2064033736f15aea833dfd2616becd4e57c971efcc3703f98Transfer156119532022-09-25 17:42:475 hrs 44 mins agoKuCoin 9 IN  Chain: XCN Token0 Ether0.00052603 9.38704318
0x3aa1dfc2fc0ef7e7f1548375718f23c344abf5e841cc1ab4343f79016c9e8984Transfer156118912022-09-25 17:30:235 hrs 56 mins ago0x0cb29d82f3631b457cf4fd8bb4c616256097c9a4 IN  Chain: XCN Token0 Ether0.0004556 8.1355218
0xb442c194835901a213e2c05fa574be137b385ff2069d92d2e083dc3c07c9c5e1Approve156117992022-09-25 17:11:476 hrs 15 mins ago0x5ce40a0eb86e24538b50be60b1907181f34a46af IN  Chain: XCN Token0 Ether0.0005727 12.31534602
0xaa1fd518a923baf16fcb875193b207965309d80ab049aacc2eda92f16b6b3ab6Transfer156117862022-09-25 17:09:116 hrs 18 mins ago0x824b8d12c73fb7d66f981f71fa061ddf2c4af286 IN  Chain: XCN Token0 Ether0.00041819 12.25
0x7854d86fb5f851ee7c15019c3a2595e57a9fdc937064e3f394a58ad6c7a1698dTransfer156117132022-09-25 16:54:236 hrs 32 mins ago0x30741289523c2e4d2a62c7d6722686d14e723851 IN  Chain: XCN Token0 Ether0.0012255521.87
0x69d2e91db71338fd92e4a7aab7cd07ed4f7a0da790e2118399918168d964f2c5Transfer156115952022-09-25 16:30:356 hrs 56 mins ago0x4ab972d90f731131ee06228c62e23de29b9450f1 IN  Chain: XCN Token0 Ether0.0006700219.627036
0x68c45460a5bd8a51faa111e69b073f2b99b422fb575ebbaf6ec6fd28ff69bb91Transfer156115452022-09-25 16:20:357 hrs 6 mins ago0x68c4d9e03d7d902053c428ca2d74b612db7f583a IN  Chain: XCN Token0 Ether0.00070345 13.72909742
0x6dbaac60bd6d617e7a39db8315caa8ffe088adaf62c3e5ec3dd3bd46ea46162cTransfer156110862022-09-25 14:48:358 hrs 38 mins agoGate.io IN  Chain: XCN Token0 Ether0.00045576 8.13845506
0xf9691bb1768201b3198ebddba944bbe8a8a74c60b5e662566c95d1b0a97264c4Transfer156110492022-09-25 14:41:118 hrs 46 mins ago0x4ab972d90f731131ee06228c62e23de29b9450f1 IN  Chain: XCN Token0 Ether0.0003412610
0x9d22273df722f83cff4d0b5b1217bd2fba9bacb239e32a71a1af27029aa29f03Transfer156108022022-09-25 13:51:359 hrs 35 mins ago0x30741289523c2e4d2a62c7d6722686d14e723851 IN  Chain: XCN Token0 Ether0.0016811430
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OVERVIEW

Chain is a cloud blockchain protocol that enables organizations to build better financial services from the ground up powered by Sequence and Chain Cloud.

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Contract Source Code Verified (Exact Match)

Contract Name:
Chain

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-03-07
*/

pragma solidity 0.5.16;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev give an account access to this role
     */
    function add(Role storage role, address account) internal {
        require(account != address(0));
        require(!has(role, account));

        role.bearer[account] = true;
    }

    /**
     * @dev remove an account's access to this role
     */
    function remove(Role storage role, address account) internal {
        require(account != address(0));
        require(has(role, account));

        role.bearer[account] = false;
    }

    /**
     * @dev check if an account has this role
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0));
        return role.bearer[account];
    }
}

contract MinterRole {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(msg.sender);
    }

    modifier onlyMinter() {
        require(isMinter(msg.sender));
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(msg.sender);
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) 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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 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 unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

/**
 * @title SafeMath96
 * @dev Unsigned math operations with safety checks that revert on error with 96 bit unsiged integer
 */
library SafeMath96 {
    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function safe96(uint n, string memory errorMessage) internal pure returns (uint96) {
        require(n < 2**96, errorMessage);
        return uint96(n);
    }

    function add96(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
        uint96 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    function sub96(uint96 a, uint96 b, string memory errorMessage) internal pure returns (uint96) {
        require(b <= a, errorMessage);
        return a - b;
    }
}
/**
 * @title ERC20 interface
 * @dev see https://eips.ethereum.org/EIPS/eip-20
 */
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

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

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @title CHN interface
 * @dev see https://github.com/chain/chain-token/blob/main/ChainToken.sol
 */
interface CHNInterface {
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function burn(uint256 _value) external;

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

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

    event Burn(address indexed burner, uint256 value);
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://eips.ethereum.org/EIPS/eip-20
 * Originally based on code by FirstBlood:
 * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 *
 * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
 * all accounts just by listening to said events. Note that this isn't required by the specification, and other
 * compliant implementations may not do it.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowed;

    uint256 private _totalSupply;

    /**
     * @dev 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 balance of.
     * @return An uint256 representing the amount owned by the passed address.
     */
    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    /**
     * @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 Transfer token to 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) {
        _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) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @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) {
        _transfer(from, to, value);
        _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
        return true;
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][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
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][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
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Transfer token for a specified addresses
     * @param from The address to transfer from.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }

    /**
     * @dev Internal function that mints an amount of the token and assigns it to
     * an account. This encapsulates the modification of balances such that the
     * proper events are emitted.
     * @param account The account that will receive the created tokens.
     * @param value The amount that will be created.
     */
    function _mint(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Approve an address to spend another addresses' tokens.
     * @param owner The address that owns the tokens.
     * @param spender The address that will spend the tokens.
     * @param value The number of tokens that can be spent.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(spender != address(0));
        require(owner != address(0));

        _allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account, deducting from the sender's allowance for said account. Uses the
     * internal burn function.
     * Emits an Approval event (reflecting the reduced allowance).
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burnFrom(address account, uint256 value) internal {
        _burn(account, value);
        _approve(account, msg.sender, _allowed[account][msg.sender].sub(value));
    }
}

/**
 * @title ERC20Mintable
 * @dev ERC20 minting logic
 */
contract ERC20Mintable is ERC20, MinterRole {
    address private MINT_BASE_TOKEN;
    uint256 private MAX_SUPPLY_AMOUNT;

    constructor (address mintBaseToken, uint256 MAX_SUPPLY) public {
        MINT_BASE_TOKEN = mintBaseToken;
        MAX_SUPPLY_AMOUNT = MAX_SUPPLY;
    }

    /**
     * @dev Function to mint tokens
     * @param to The address that will receive the minted tokens.
     * @param value The amount of tokens to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address to, uint256 value) public returns (bool) {
        require(CHNInterface(MINT_BASE_TOKEN).balanceOf(msg.sender) >= value, "Mint Base Token Insufficient");
        require(totalSupply().add(value.mul(1000)) < MAX_SUPPLY_AMOUNT, "Mint limited max supply");
        IERC20(MINT_BASE_TOKEN).transferFrom(msg.sender, address(this), value);
        CHNInterface(MINT_BASE_TOKEN).burn(value);
        _mint(to, value.mul(1000));
        return true;
    }
}

/**
 * @title ERC20Detailed token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @return the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

contract Chain is ERC20Mintable, ERC20Detailed {
    using SafeMath96 for uint96;

    uint8 public constant DECIMALS = 18;
    uint256 public constant INITIAL_SUPPLY = 21537311000 * (10 ** uint256(DECIMALS));
    uint256 public constant MAX_SUPPLY = 68895442185 * (10 ** uint256(DECIMALS));
    address public constant MINT_BASE = 0x41C37A4683d6a05adB31c39D71348A8403B13Ca9;

    /// @notice A record of each accounts delegate
    mapping (address => address) public delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint256 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping (address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");

    /// @notice A record of states for signing / validating signatures
    mapping (address => uint) public nonces;

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);

    /**
     * @dev Constructor that gives msg.sender all of existing tokens.
     */
    constructor () public ERC20Detailed("Chain", "XCN", DECIMALS) ERC20Mintable(MINT_BASE, MAX_SUPPLY) {
        _mint(msg.sender, INITIAL_SUPPLY);
    }

    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        _moveDelegates(delegates[msg.sender], delegates[to], value);
        return true;
    }


    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _transfer(from, to, value);
        _approve(from, msg.sender, allowance(from, msg.sender).sub(value));
        _moveDelegates(delegates[msg.sender], delegates[to], value);
        return true;
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) public {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(address delegatee, uint nonce, uint expiry, uint8 v, bytes32 r, bytes32 s) public {
        bytes32 domainSeparator = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name())), getChainId(), address(this)));
        bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), "Xcn::delegateBySig: invalid signature");
        require(nonce == nonces[signatory]++, "Xcn::delegateBySig: invalid nonce");
        require(now <= expiry, "Xcn::delegateBySig: signature expired");
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view returns (uint256) {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint blockNumber) public view returns (uint256) {
        require(blockNumber < block.number, "Xcn::getPriorVotes: not yet determined");

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee) internal {
        address currentDelegate = delegates[delegator];
        uint256 delegatorBalance = balanceOf(delegator);
        delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint256 srcRepNew = srcRepOld.sub(amount);
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint256 dstRepNew = dstRepOld.add(amount);
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(address delegatee, uint32 nCheckpoints, uint256 oldVotes, uint256 newVotes) internal {
      uint32 blockNumber = safe32(block.number, "Xcn::_writeCheckpoint: block number exceeds 32 bits");

      if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
          checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
      } else {
          checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
          numCheckpoints[delegatee] = nCheckpoints + 1;
      }

      emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }
    
    function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

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

Contract Security Audit

Contract ABI

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":"s","type":"bytes32"}],"name":"delegateBySig","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"delegates","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getCurrentVotes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"blockNumber","type":"uint256"}],"name":"getPriorVotes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isMinter","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"numCheckpoints","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceMinter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

bzzr://785d674bad5af3e332f4d46ffd3287330c425b188408647655b04b6ef1ce6e5c
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.