ETH Price: $1,882.41 (-2.53%)
 
Transaction Hash
Method
Block
From
To
Transfer220596082025-03-16 13:01:233 mins ago1742130083IN
Chromia: CHR Token
0 ETH0.000084862.46869357
Transfer220595312025-03-16 12:45:5918 mins ago1742129159IN
Chromia: CHR Token
0 ETH0.000201486.81184895
Transfer220595152025-03-16 12:42:4722 mins ago1742128967IN
Chromia: CHR Token
0 ETH0.000142312.7645565
Transfer220581732025-03-16 8:12:594 hrs ago1742112779IN
Chromia: CHR Token
0 ETH0.00005912
Approve220581302025-03-16 8:04:115 hrs ago1742112251IN
Chromia: CHR Token
0 ETH0.000023070.5
Transfer220574762025-03-16 5:52:477 hrs ago1742104367IN
Chromia: CHR Token
0 ETH0.00005912
Approve220557712025-03-16 0:09:5912 hrs ago1742083799IN
Chromia: CHR Token
0 ETH0.000025430.55213078
Transfer220548232025-03-15 20:58:4716 hrs ago1742072327IN
Chromia: CHR Token
0 ETH0.000087731.87958883
Transfer220546832025-03-15 20:30:4716 hrs ago1742070647IN
Chromia: CHR Token
0 ETH0.000023860.4636286
Transfer220544362025-03-15 19:41:2317 hrs ago1742067683IN
Chromia: CHR Token
0 ETH0.000087082.53303352
Transfer220543882025-03-15 19:31:3517 hrs ago1742067095IN
Chromia: CHR Token
0 ETH0.000084272.45214537
Transfer220532742025-03-15 15:47:4721 hrs ago1742053667IN
Chromia: CHR Token
0 ETH0.000021320.4570422
Transfer220516912025-03-15 10:30:1126 hrs ago1742034611IN
Chromia: CHR Token
0 ETH0.000059152
Transfer220516552025-03-15 10:22:5926 hrs ago1742034179IN
Chromia: CHR Token
0 ETH0.000046671
Transfer220516472025-03-15 10:21:2326 hrs ago1742034083IN
Chromia: CHR Token
0 ETH0.000051471
Approve220514552025-03-15 9:42:4727 hrs ago1742031767IN
Chromia: CHR Token
0 ETH0.000045120.97796645
Transfer220514212025-03-15 9:35:5927 hrs ago1742031359IN
Chromia: CHR Token
0 ETH0.000102932
Transfer220504092025-03-15 6:12:5930 hrs ago1742019179IN
Chromia: CHR Token
0 ETH0.000059132
Transfer220503742025-03-15 6:05:4730 hrs ago1742018747IN
Chromia: CHR Token
0 ETH0.000033190.71130425
Approve220499322025-03-15 4:36:5932 hrs ago1742013419IN
Chromia: CHR Token
0 ETH0.000068021.46584179
Approve220490672025-03-15 1:43:5935 hrs ago1742003039IN
Chromia: CHR Token
0 ETH0.000023860.51724442
Transfer220484052025-03-14 23:30:1137 hrs ago1741995011IN
Chromia: CHR Token
0 ETH0.000059132
Transfer220483612025-03-14 23:21:2337 hrs ago1741994483IN
Chromia: CHR Token
0 ETH0.000046661
Transfer220483592025-03-14 23:20:5937 hrs ago1741994459IN
Chromia: CHR Token
0 ETH0.000051461
Transfer220480742025-03-14 22:22:5938 hrs ago1741990979IN
Chromia: CHR Token
0 ETH0.00005912
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Contract Source Code Verified (Exact Match)

Contract Name:
Chromia

Compiler Version
v0.5.8+commit.23d335f2

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-10-04
*/

/**
 *Submitted for verification at Etherscan.io on 2019-05-27
*/

// Copyright (C) Chromapolis Devcenter OU 2019


// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.2;

/**
 * @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);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.2;

/**
 * @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;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.2;



/**
 * @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 A 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));
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.2;


/**
 * @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;
    }
}

// File: contracts/token/ERC20/Chromia.sol

// Copyright (C) Chromapolis Devcenter OU 2019

pragma solidity 0.5.8;



contract Chromia is ERC20, ERC20Detailed {
    uint8 public constant DECIMALS = 6;
    address private _minter;
    // one billion tokens with 6 decimals
    uint256 private _cap = 1000000000 * 1000000;

    event MinterSet(address indexed account);
    event TransferToChromia(address indexed from, bytes32 indexed to, uint256 value);
    event TransferFromChromia(address indexed to, bytes32 indexed refID, uint256 value);

    /**
     * @dev Constructor that gives msg.sender all of existing tokens.
     * @param minter the multi-sig contract address
     */
    constructor(address minter, uint256 initialBalance) public ERC20Detailed("Chroma", "CHR", DECIMALS) {
        _mint(msg.sender, initialBalance);
        _setMinter(minter);
    }

    modifier onlyMinter() {
        require(isMinter(msg.sender), "caller is not a minter");
        _;
    }
    
    function cap() public view returns (uint256) {
        return _cap;
    }

    /**
     * @dev Burns a specific amount of tokens and emit transfer event for Chromia
     * @param to The address to transfer to in Chromia.
     * @param value The amount of token to be burned.
     */
    function transferToChromia(bytes32 to, uint256 value) public {
        _burn(msg.sender, value);
        emit TransferToChromia(msg.sender, to, value);
    }

    /**
     * @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 transferFromChromia(address to, uint256 value, bytes32 refID) public onlyMinter returns (bool) {
        _mint(to, value);
        emit TransferFromChromia(to, refID, value);
        return true;
    }
    
    function _mint(address account, uint256 value) internal {
        require(totalSupply().add(value) <= cap(), "ERC20Capped: cap exceeded");
        super._mint(account, value);
    }

    function isMinter(address account) public view returns (bool) {
        return _minter == account;
    }

    function _setMinter(address account) internal {
        _minter = account;
        emit MinterSet(account);
    }
    
    function changeMinter(address newMinter) public onlyMinter {
        _setMinter(newMinter);
    }
}

Contract Security Audit

Contract ABI

API
[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"bytes32"},{"name":"value","type":"uint256"}],"name":"transferToChromia","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newMinter","type":"address"}],"name":"changeMinter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"DECIMALS","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"cap","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"isMinter","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"value","type":"uint256"},{"name":"refID","type":"bytes32"}],"name":"transferFromChromia","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"owner","type":"address"},{"name":"spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"minter","type":"address"},{"name":"initialBalance","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"account","type":"address"}],"name":"MinterSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"bytes32"},{"indexed":false,"name":"value","type":"uint256"}],"name":"TransferToChromia","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"to","type":"address"},{"indexed":true,"name":"refID","type":"bytes32"},{"indexed":false,"name":"value","type":"uint256"}],"name":"TransferFromChromia","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]

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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)

0000000000000000000000008708e8756f1202bc1760098cfc1c1bfa8306ca0d0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : minter (address): 0x8708E8756f1202Bc1760098CFc1C1bfa8306CA0d
Arg [1] : initialBalance (uint256): 0

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000008708e8756f1202bc1760098cfc1c1bfa8306ca0d
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://50a1d6e08ee19b18063e8e283b2f39d2e3bd161a749b21a4469691e7e98413e9

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

Chromia is a relational blockchain designed to make it much easier to make complex and scalable dapps.

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.