QRC20 Token

About QRC20

QRC20 is the implementation of a standard API for tokens within smart contracts on Qtum,basically it is the same as ERC20.
Methods and Events:

function name() constant returns (string name)
function symbol() constant returns (string symbol)
function decimals() constant returns (uint8 decimals)
function totalSupply() constant returns (uint256 totalSupply)
function balanceOf(address _owner) constant returns (uint256 balance)
function transfer(address _to, uint256 _value) returns (bool success)
function transferFrom(address _from, address _to, uint256 _value) returns (bool success)
function approve(address _spender, uint256 _value) returns (bool success)
function allowance(address _owner, address _spender) constant returns (uint256 remaining)
event Transfer(address indexed _from, address indexed _to, uint256 _value)
event Approval(address indexed _owner, address indexed _spender, uint256 _value)


One example offeres:QRC20Token, you can use this code to publish your token on Qtum.

In QRC20Token.sol, change namesymbol and totalSupply to your own preference.


Install the wallet

Download the latest Qtum Core wallet from https://eco.qtum.org/wallet or https://github.com/qtumproject/qtum/releases/latest.

Once finish,you should withdraw some qtum coins to your wallet to pay for the gas fee.
Click Request payment to get your receive address.

Compile the code

Open https://ethereum.github.io/browser-solidity/ in your browser.

Click the “+” button on the top-right side,create new files SafeMath.sol and QRC20Token.sol, copy & paste you code heer.
Click “detail” on the right side, copy the save BYTECODE。

Create contract

Open Qtum Core wallet, go to “Smart Contract” =》 “Create”, paste the BYTECODE.
Click “Create Contract” button, save the SenderAddress and ContractAddress for future using.
Wait some time until the transaction get confirmed, and the contract is created successfully.

Test on testnet

Before publish your code on mainnet, you'd better test it on testnet.

Go to https://github.com/qtumproject/documents/blob/master/en/Testnet-User-Guide.md to get more information about Qtum testnet.

Wallet usage

Add token

In Qtum Core wallet, go to “QRC Token” page and click “Add Token” button, input your SenderAddress, and choose SenderAddress as your Token Address, click “Confirm” button to get this done.

If you cannot find the SenderAddress in the Token Address combobox, please send some qtum coins to the SenderAddress and try again.

Receive and send tokens

In “QRC Token” page, click to choose your token,the you can click the “Send” and “Receive” button below to receive and send tokens。

More to know

  • A small amount of QTUM coins is needed to pay for the token sending gas fee, please ensure you have enough QTUMs in the token binding address.

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