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Contract

0x1E5922f4EF1c30E0780Dc017A83c5E9b3C26c857
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

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Transaction Hash
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Block
From
To
Transfer125178012021-05-27 17:53:191325 days ago1622137999IN
0x1E5922f4...b3C26c857
0 ETH0.0011744634.00000145
Transfer125177762021-05-27 17:46:011325 days ago1622137561IN
0x1E5922f4...b3C26c857
0 ETH0.0016521932.00000156
Approve117022282021-01-22 0:51:491450 days ago1611276709IN
0x1E5922f4...b3C26c857
0 ETH0.01110513252.00000148
Approve112436122020-11-12 15:35:031521 days ago1605195303IN
0x1E5922f4...b3C26c857
0 ETH0.0066102150
Approve108172752020-09-07 22:42:191586 days ago1599518539IN
0x1E5922f4...b3C26c857
0 ETH0.0036135782
Approve107454462020-08-27 22:57:331597 days ago1598569053IN
0x1E5922f4...b3C26c857
0 ETH0.0026440860
Approve107442322020-08-27 18:25:141598 days ago1598552714IN
0x1E5922f4...b3C26c857
0 ETH0.002644860.00000134
Approve107442272020-08-27 18:24:231598 days ago1598552663IN
0x1E5922f4...b3C26c857
0 ETH0.002581558.564

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107309212020-08-25 17:22:061600 days ago1598376126  Contract Creation0 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x1F832091...611225d46
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Nest_NToken

Compiler Version
v0.6.0+commit.26b70077

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, GNU GPLv3 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-12-10
*/

pragma solidity 0.6.0;

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

//  voting contract 
interface Nest_3_VoteFactory {
    //  Check address 
	function checkAddress(string calldata name) external view returns (address contractAddress);
	//  check whether the administrator 
	function checkOwners(address man) external view returns (bool);
}

/**
 * @title NToken contract 
 * @dev Include standard erc20 method, mining method, and mining data 
 */
interface IERC20 {
    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 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);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract Nest_NToken is IERC20 {
    using SafeMath for uint256;
    
    mapping (address => uint256) private _balances;                                 //  Balance ledger 
    mapping (address => mapping (address => uint256)) private _allowed;             //  Approval ledger 
    uint256 private _totalSupply = 0 ether;                                         //  Total supply 
    string public name;                                                             //  Token name 
    string public symbol;                                                           //  Token symbol 
    uint8 public decimals = 18;                                                     //  Precision
    uint256 public _createBlock;                                                    //  Create block number
    uint256 public _recentlyUsedBlock;                                              //  Recently used block number
    Nest_3_VoteFactory _voteFactory;                                                //  Voting factory contract
    address _bidder;                                                                //  Owner
    
    /**
    * @dev Initialization method
    * @param _name Token name
    * @param _symbol Token symbol
    * @param voteFactory Voting factory contract address
    * @param bidder Successful bidder address
    */
    constructor (string memory _name, string memory _symbol, address voteFactory, address bidder) public {
    	name = _name;                                                               
    	symbol = _symbol;
    	_createBlock = block.number;
    	_recentlyUsedBlock = block.number;
    	_voteFactory = Nest_3_VoteFactory(address(voteFactory));
    	_bidder = bidder;
    }
    
    /**
    * @dev Reset voting contract method
    * @param voteFactory Voting contract address
    */
    function changeMapping (address voteFactory) public onlyOwner {
    	_voteFactory = Nest_3_VoteFactory(address(voteFactory));
    }
    
    /**
    * @dev Additional issuance
    * @param value Additional issuance amount
    */
    function increaseTotal(uint256 value) public {
        address offerMain = address(_voteFactory.checkAddress("nest.nToken.offerMain"));
        require(address(msg.sender) == offerMain, "No authority");
        _balances[offerMain] = _balances[offerMain].add(value);
        _totalSupply = _totalSupply.add(value);
        _recentlyUsedBlock = block.number;
    }

    /**
    * @dev Check the total amount of tokens
    * @return Total supply
    */
    function totalSupply() override public view returns (uint256) {
        return _totalSupply;
    }

    /**
    * @dev Check address balance
    * @param owner Address to be checked
    * @return Return the balance of the corresponding address
    */
    function balanceOf(address owner) override public view returns (uint256) {
        return _balances[owner];
    }
    
    /**
    * @dev Check block information
    * @return createBlock Initial block number
    * @return recentlyUsedBlock Recently mined and issued block
    */
    function checkBlockInfo() public view returns(uint256 createBlock, uint256 recentlyUsedBlock) {
        return (_createBlock, _recentlyUsedBlock);
    }

    /**
     * @dev Check owner's approved allowance to the spender
     * @param owner Approving address
     * @param spender Approved address
     * @return Approved amount
     */
    function allowance(address owner, address spender) override public view returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
    * @dev Transfer method
    * @param to Transfer target
    * @param value Transfer amount
    * @return Whether the transfer is successful
    */
    function transfer(address to, uint256 value) override public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approval method
     * @param spender Approval target
     * @param value Approval amount
     * @return Whether the approval is successful
     */
    function approve(address spender, uint256 value) override public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens when approved
     * @param from Transfer-out account address
     * @param to Transfer-in account address
     * @param value Transfer amount
     * @return Whether approved transfer is successful
     */
    function transferFrom(address from, address to, uint256 value) override public returns (bool) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        return true;
    }

    /**
     * @dev Increase the allowance
     * @param spender Approval target
     * @param addedValue Amount to increase
     * @return whether increase is successful
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the allowance
     * @param spender Approval target
     * @param subtractedValue Amount to decrease
     * @return Whether decrease is successful
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
    * @dev Transfer method
    * @param to Transfer target
    * @param value Transfer amount
    */
    function _transfer(address from, address to, uint256 value) internal {
        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }
    
    /**
    * @dev Check the creator
    * @return Creator address
    */
    function checkBidder() public view returns(address) {
        return _bidder;
    }
    
    /**
    * @dev Transfer creator
    * @param bidder New creator address
    */
    function changeBidder(address bidder) public {
        require(address(msg.sender) == _bidder);
        _bidder = bidder; 
    }
    
    // Administrator only
    modifier onlyOwner(){
        require(_voteFactory.checkOwners(msg.sender));
        _;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"address","name":"voteFactory","type":"address"},{"internalType":"address","name":"bidder","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":"value","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":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"_createBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_recentlyUsedBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"bidder","type":"address"}],"name":"changeBidder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"voteFactory","type":"address"}],"name":"changeMapping","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"checkBidder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkBlockInfo","outputs":[{"internalType":"uint256","name":"createBlock","type":"uint256"},{"internalType":"uint256","name":"recentlyUsedBlock","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"increaseTotal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","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":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"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"}],"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

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Deployed Bytecode Sourcemap

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Swarm Source

ipfs://732ed18cfb08aa8ddce47e3df3862d172ea4dcb0bc2be56c6b5c9a2c5af587cb

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.