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Contract

0x387f14A4C43Ea1E694CBA3a30638073222ec33b5
 

Overview

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0 ETH

Eth Value

$0.00

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Method
Block
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To
Approve119429902021-02-28 1:53:031298 days ago1614477183IN
0x387f14A4...222ec33b5
0 ETH0.0010557273
Approve119429902021-02-28 1:53:031298 days ago1614477183IN
0x387f14A4...222ec33b5
0 ETH0.0010557273
Approve116930542021-01-20 15:20:241337 days ago1611156024IN
0x387f14A4...222ec33b5
0 ETH0.0028203564
Approve114280222020-12-10 23:01:251377 days ago1607641285IN
0x387f14A4...222ec33b5
0 ETH0.0043627399
Approve110636612020-10-16 0:24:191433 days ago1602807859IN
0x387f14A4...222ec33b5
0 ETH0.0014983134.00000145
Transfer109818752020-10-03 8:22:591446 days ago1601713379IN
0x387f14A4...222ec33b5
0 ETH0.0020447640
Approve109284162020-09-24 23:56:361454 days ago1600991796IN
0x387f14A4...222ec33b5
0 ETH0.0028644265
Transfer108194042020-09-08 6:35:421471 days ago1599546942IN
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0 ETH0.0023846466
Transfer108193842020-09-08 6:32:121471 days ago1599546732IN
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0 ETH0.0023678965.53624617
Approve108065242020-09-06 7:11:561473 days ago1599376316IN
0x387f14A4...222ec33b5
0 ETH0.00524409119.00000145
Transfer108031462020-09-05 18:49:131473 days ago1599331753IN
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0 ETH0.01130149313
Approve107924992020-09-04 3:54:271475 days ago1599191667IN
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0 ETH0.00572884130
Transfer107692172020-08-31 14:28:441479 days ago1598884124IN
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0 ETH0.01360084266
Approve107464242020-08-28 2:22:021482 days ago1598581322IN
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0 ETH0.00621358141
Transfer107460422020-08-28 0:58:231482 days ago1598576303IN
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0 ETH0.0017342848
Transfer107008362020-08-21 2:11:531489 days ago1597975913IN
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0 ETH0.0020919699
Transfer107008012020-08-21 2:03:321489 days ago1597975412IN
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0 ETH0.0035408398
Approve107001572020-08-20 23:44:131489 days ago1597967053IN
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0 ETH0.0033491676
Approve106938962020-08-20 0:51:101490 days ago1597884670IN
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0 ETH0.0024121997
Approve106938952020-08-20 0:51:071490 days ago1597884667IN
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0 ETH0.0024121997
Approve106938952020-08-20 0:51:071490 days ago1597884667IN
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0 ETH0.0041423994.00000145
Transfer106887822020-08-19 5:50:211491 days ago1597816221IN
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0 ETH0.00685155134
Approve106731342020-08-16 20:00:461493 days ago1597608046IN
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0 ETH0.0035704881
Transfer106675142020-08-15 23:15:231494 days ago1597533323IN
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0 ETH0.0029627482
Transfer106674402020-08-15 23:00:011494 days ago1597532401IN
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0 ETH0.00562441110
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105084542020-07-22 9:42:291519 days ago1595410949  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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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.