Introduction

KIP20 Token

A KIP20 token must implement the interface IKIP20 in IKIP20.sol. This is a template contract KIP20Token.template. Users just need to fill in _name, _symbol, _decimals and _totalSupply according to their own requirements:

  constructor() public {
    _name = {{TOKEN_NAME}};
    _symbol = {{TOKEN_SYMBOL}};
    _decimals = {{DECIMALS}};
    _totalSupply = {{TOTAL_SUPPLY}};
    _balances[msg.sender] = _totalSupply;

    emit Transfer(address(0), msg.sender, _totalSupply);
  }

Then users can use Remix IDE and Metamask to compile and deploy the KIP20 contract to OKC.

Interact with Contract with Web3 and NodeJS.

Connect to OKC’s public RPC endpoint

const Web3 = require('web3');

// testnet
const web3 = new Web3('http://13.230.73.12:8545');

Create a wallet

web3.eth.accounts.create([entropy]);

Output:

web3.eth.accounts.create();
{
  address: '0x03975c070801D6110EBD8301a0F159f89FB7a4C0',
  privateKey: 'BB1C835AB9770454318D8F19079AA1498EFE3B57654E8084134ADB7854969D93',
  signTransaction: [Function: signTransaction],
  sign: [Function: sign],
  encrypt: [Function: encrypt]
}

Recover a wallet

const account = web3.eth.accounts.privateKeyToAccount("BB1C835AB9770454318D8F19079AA1498EFE3B57654E8084134ADB7854969D93")

Check balance

web3.eth.getBalance(holder).then(console.log);

Output: The balance will be bumped by e18 for OKT.

6249621999900000000

Create transaction Parameters

  • Object - The transaction object to send:
  • from - String|Number: The address for the sending account. Uses the web3.eth.defaultAccount property, if not specified. Or an address or index of a local wallet in web3.eth.accounts.wallet.
  • to - String: (optional) The destination address of the message, left undefined for a contract-creation transaction.
  • value - Number|String|BN|BigNumber: (optional) The value transferred for the transaction in wei, also the endowment if it’s a contract-creation transaction.
  • gas - Number: (optional, default: To-Be-Determined) The amount of gas to use for the transaction (unused gas is refunded).
  • gasPrice - Number|String|BN|BigNumber: (optional) The price of gas for this transaction in wei, defaults to web3.eth.gasPrice.
  • data - String: (optional) Either a ABI byte string containing the data of the function call on a contract, or in the case of a contract-creation transaction the initialisation code.
  • nonce - Number: (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce.
    // // Make a transaction using the promise
    web3.eth.sendTransaction({
        from: holder,
        to: '0x0B75fbeB0BC7CC0e9F9880f78a245046eCBDBB0D',
        value: '1000000000000000000',
        gas: 4500000,
        gasPrice: 17e8,
    }, function(err, transactionHash) {
      if (err) {
        console.log(err);
        } else {
        console.log(transactionHash);
       }
    });