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NuCypher (NU) ($0.0212)

Multichain Info

Transaction Hash
Method
Block
From
To
Approve245648842026-03-01 20:08:114 hrs ago1772395691IN
NuCypher: NU Token
0 ETH0.000003560.07687243
Transfer245648522026-03-01 20:01:474 hrs ago1772395307IN
NuCypher: NU Token
0 ETH0.000002740.0587861
Approve245632832026-03-01 14:46:599 hrs ago1772376419IN
NuCypher: NU Token
0 ETH0.000097292.08791204
Approve245631642026-03-01 14:23:1110 hrs ago1772374991IN
NuCypher: NU Token
0 ETH0.000009780.21136198
Approve245628022026-03-01 13:10:2311 hrs ago1772370623IN
NuCypher: NU Token
0 ETH0.000049071.05333424
Transfer245590992026-03-01 0:46:4723 hrs ago1772326007IN
NuCypher: NU Token
0 ETH0.000002480.05325418
Approve245557812026-02-28 13:38:1135 hrs ago1772285891IN
NuCypher: NU Token
0 ETH0.000099772.15159382
Approve245507902026-02-27 20:55:352 days ago1772225735IN
NuCypher: NU Token
0 ETH0.000095422.05722966
Approve245499652026-02-27 18:09:352 days ago1772215775IN
NuCypher: NU Token
0 ETH0.000003540.14663695
Approve245418172026-02-26 14:53:353 days ago1772117615IN
NuCypher: NU Token
0 ETH0.000020560.44137514
Approve245413522026-02-26 13:20:233 days ago1772112023IN
NuCypher: NU Token
0 ETH0.000001910.07901565
Transfer245379682026-02-26 2:01:233 days ago1772071283IN
NuCypher: NU Token
0 ETH0.000095742.04964083
Transfer245379032026-02-26 1:48:233 days ago1772070503IN
NuCypher: NU Token
0 ETH0.000055152.05605266
Approve245363222026-02-25 20:30:234 days ago1772051423IN
NuCypher: NU Token
0 ETH0.000008610.18599466
Approve245335682026-02-25 11:15:474 days ago1772018147IN
NuCypher: NU Token
0 ETH0.000006690.14459083
Approve245322282026-02-25 6:46:594 days ago1772002019IN
NuCypher: NU Token
0 ETH0.000003440.1421566
Approve245292662026-02-24 20:51:355 days ago1771966295IN
NuCypher: NU Token
0 ETH0.000003030.06542933
Transfer245286992026-02-24 18:57:355 days ago1771959455IN
NuCypher: NU Token
0 ETH0.000055292.06140009
Approve245231522026-02-24 0:24:476 days ago1771892687IN
NuCypher: NU Token
0 ETH0.00009482.0443849
Transfer245231412026-02-24 0:22:356 days ago1771892555IN
NuCypher: NU Token
0 ETH0.000006860.14701867
Approve245231342026-02-24 0:21:116 days ago1771892471IN
NuCypher: NU Token
0 ETH0.000006690.14445606
Transfer245185932026-02-23 9:08:236 days ago1771837703IN
NuCypher: NU Token
0 ETH0.0000311.04543303
Approve245176312026-02-23 5:55:356 days ago1771826135IN
NuCypher: NU Token
0 ETH0.000001880.04059194
Approve245176312026-02-23 5:55:356 days ago1771826135IN
NuCypher: NU Token
0 ETH0.000001060.04059194
Approve245156482026-02-22 23:17:357 days ago1771802255IN
NuCypher: NU Token
0 ETH0.000095772.06534816
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Contract Source Code Verified (Exact Match)

Contract Name:
NuCypherToken

Compiler Version
v0.7.0+commit.9e61f92b

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, GNU AGPLv3 license
/**
 *Submitted for verification at Etherscan.io on 2020-08-30
*/

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity ^0.7.0;

/**
 * @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 ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/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 Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * 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 override 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 override 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 override returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
     * @dev Transfer token for a specified address
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function transfer(address to, uint256 value) public override 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 override returns (bool) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require(value == 0 || _allowed[msg.sender][spender] == 0);

        _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 override 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_[_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_[_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 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.
 */
abstract contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) {
        _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;
    }
}


/**
* @dev Interface to use the receiveApproval method
*/
interface TokenRecipient {

    /**
    * @notice Receives a notification of approval of the transfer
    * @param _from Sender of approval
    * @param _value  The amount of tokens to be spent
    * @param _tokenContract Address of the token contract
    * @param _extraData Extra data
    */
    function receiveApproval(address _from, uint256 _value, address _tokenContract, bytes calldata _extraData) external;

}


/**
* @title NuCypher token
* @notice ERC20 token
* @dev Optional approveAndCall() functionality to notify a contract if an approve() has occurred.
*/
contract NuCypherToken is ERC20, ERC20Detailed('NuCypher', 'NU', 18) {

    /**
    * @notice Set amount of tokens
    * @param _totalSupplyOfTokens Total number of tokens
    */
    constructor (uint256 _totalSupplyOfTokens) {
        _mint(msg.sender, _totalSupplyOfTokens);
    }

    /**
    * @notice Approves and then calls the receiving contract
    *
    * @dev call the receiveApproval function on the contract you want to be notified.
    * receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
    */
    function approveAndCall(address _spender, uint256 _value, bytes calldata _extraData)
        external returns (bool success)
    {
        approve(_spender, _value);
        TokenRecipient(_spender).receiveApproval(msg.sender, _value, address(this), _extraData);
        return true;
    }

}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"uint256","name":"_totalSupplyOfTokens","type":"uint256"}],"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":[{"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":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"},{"internalType":"bytes","name":"_extraData","type":"bytes"}],"name":"approveAndCall","outputs":[{"internalType":"bool","name":"success","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":[],"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":[],"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"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000000000000000000000c8deb5a6116cca825b9dbb2

-----Decoded View---------------
Arg [0] : _totalSupplyOfTokens (uint256): 3885390081748248632541961138

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000c8deb5a6116cca825b9dbb2


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://9483e9d9d88d96576df326dde3fa3355ea5324d50e80edd2cc32d4f6e31509f0

Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

NuCypher is a threshold cryptography network.

0x4fE83213D56308330EC302a8BD641f1d0113A4Cc
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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.