Blockwell

LoopringCoin V2

ERC20

This contract is an ERC20 token.

Name LoopringCoin V2
Symbol LRC
Decimals 18
Total Supply 1,374,513,897 LRC

About link description

Loopring (LRC) is an open protocol for scalable non-custodial exchanges on Ethereum. The Loopring protocol smart contracts and zero-knowledge proof circuits allow the building of high-performance DEXes using a zkRollup construction. This allows for higher throughput and lower settlement costs without sacrificing Ethereum-level security guarantees. LRC token can be staked by holders to earn protocol fees, and by DEXes as a bond to follow protocol-defined behaviour.

Stats

Public Functions 13
Event Types 3
Code Size 10,276 bytes

Library Use

Uses SafeMath for uint256.

Approval Event

Parameters help
owner
address help
spender
address help
value
uint256 help

Burn Event

Parameters help
burner
address help
value
uint256 help

Transfer Event

Parameters help
from
address help
to
address help
value
uint256 help

Functions Expand All Collapse All

totalSupply keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

balanceOf keyboard_arrow_up

Parameters help

Name Type
_owner
address help

Properties

Visibility help public
Mutability help view
Source Code
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

transfer keyboard_arrow_up

Parameters help

Name Type
_to
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction
Source Code
    function transfer(address _to, uint256 _value) public returns (bool) {
        // if _to is address(0), invoke burn function.
        if (_to == address(0)) {
            return burn(_value);
        }

        require(_value <= balances[msg.sender]);
        // SafeMath.sub will throw if there is not enough balance.
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

totalBurned keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help view
Source Code
    function totalBurned() public view returns (uint256) {
        return burnedTotalNum_;
    }

burn keyboard_arrow_up

Parameters help

Name Type
_value
uint256 help

Properties

Visibility help public
Mutability help transaction
Source Code
    function burn(uint256 _value) public returns (bool) {
        require(_value <= balances[msg.sender]);

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        burnedTotalNum_ = burnedTotalNum_.add(_value);

        emit Burn(burner, _value);
        return true;
    }

allowance keyboard_arrow_up

Parameters help

Name Type
_owner
address help
_spender
address help

Properties

Visibility help public
Mutability help view
Source Code
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

transferFrom keyboard_arrow_up

Parameters help

Name Type
_from
address help
_to
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction
Source Code
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        if (_to == address(0)) {
            return burnFrom(_from, _value);
        }

        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);

        /// an allowance of MAX_UINT represents an unlimited allowance.
        /// @dev see https://github.com/ethereum/EIPs/issues/717
        if (allowed[_from][msg.sender] < MAX_UINT) {
            allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        }
        emit Transfer(_from, _to, _value);
        return true;
    }

approve keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction
Source Code
    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

burnFrom keyboard_arrow_up

Parameters help

Name Type
_owner
address help
_value
uint256 help

Properties

Visibility help public
Mutability help transaction

Requirements help

Source Code
    function burnFrom(address _owner, uint256 _value) public returns (bool) {
        require(_owner != address(0));
        require(_value <= balances[_owner]);
        require(_value <= allowed[_owner][msg.sender]);

        balances[_owner] = balances[_owner].sub(_value);
        if (allowed[_owner][msg.sender] < MAX_UINT) {
            allowed[_owner][msg.sender] = allowed[_owner][msg.sender].sub(_value);
        }
        totalSupply_ = totalSupply_.sub(_value);
        burnedTotalNum_ = burnedTotalNum_.add(_value);

        emit Burn(_owner, _value);
        return true;
    }

increaseApproval keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_addedValue
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
    function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

decreaseApproval keyboard_arrow_up

Parameters help

Name Type
_spender
address help
_subtractedValue
uint help

Properties

Visibility help public
Mutability help transaction
Source Code
    function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

batchTransfer keyboard_arrow_up

Parameters help

Name Type
accounts
address[] help
amounts
uint256[] help

Properties

Visibility help public
Mutability help transaction
Source Code
    function batchTransfer(address[] calldata accounts, uint256[] calldata amounts)
        external
        returns (bool)
    {
        require(accounts.length == amounts.length);
        for (uint i = 0; i < accounts.length; i++) {
            require(transfer(accounts[i], amounts[i]), "transfer failed");
        }
        return true;
    }

constructor keyboard_arrow_up

Parameters help

This function has no parameters.

Properties

Visibility help public
Mutability help payable
Source Code
    function () payable external {
        revert();
    }