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function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
   allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
   Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
   return true;
}

function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
   uint oldValue = allowed[msg.sender][_spender];
   if (_subtractedValue > oldValue) {
       allowed[msg.sender][_spender] = 0;

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function transfer(address _to, uint256 _value) public returns (bool) {
   require(_to != address(0));
   require(_value <= balances[msg.sender]);
   balances[msg.sender] = balances[msg.sender].sub(_value);
   balances[_to] = balances[_to].add(_value);
   Transfer(msg.sender, _to, _value);
   return true;
}
function balanceOf(address _owner) public view returns (uint256 balance) {
   return balances[_owner];

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function approve( address _spender, uint256 _value, bytes _data ) public returns (bool) {
   require(_spender != address(this));
   super.approve(_spender, _value);
   require(_spender.call(_data));
   return true;
}
function transfer( address _to, uint256 _value, bytes _data ) public returns (bool) {
   require(_to != address(this));
   super.transfer(_to, _value);
   require(_to.call(_data));

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async withdraw(claimant, mgcc) {
   const txObject = {
       from: claimant,
       to: this.tokenContractAddress,
       gas: 120000,
       value: 0,
   };
   return new Promise((resolve, reject) => {
       this.tokenContract.approve.sendTransaction(
           this.exchangeContractAddress,

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GoCryptobotCoinERC827 internal coin;
function setCoinContract(address _address) external onlyOwnerOrOperator {
   GoCryptobotCoinERC827 _contract = GoCryptobotCoinERC827(_address);
   coin = _contract;
}
uint8 constant FEE_RATE = 5;
function withdraw(address _claimant, uint256 _mgcc) public whenNotPaused {
   require(coin.allowance(_claimant, this) >= _mgcc);
   require(coin.transferFrom(_claimant, coinStorage, _mgcc));
   uint256 exchange = (_convertToWei(_mgcc) / 100) * (100 - FEE_RATE);

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var SDK = require("codechain-sdk");
var sdk = new SDK({ server: "http://localhost:8080" });

var address = "ccaqqqk7n0a0w69tjfza9svdjzhvu95cpl29ssnyn99ml8nvl8q6sd2c7qgjejfc";

var assetMintTransaction = sdk.core.createAssetMintTransaction({
    scheme: {
        shardId: 0,
        metadata: JSON.stringify({
            name: "Wow Token",

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var SDK = require("codechain-sdk");

var sdk = new SDK({ server: "http://localhost:8080" });

sdk.rpc.account.create("my-secret").then(function (account) {
    console.log(account); // string that starts with "ccc". For example: cccqzn9jjm3j6qg69smd7cn0eup4w7z2yu9myd6c4d7
}).catch(console.error);

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# npm
npm install codechain-sdk
# yarn
yarn add codechain-sdk

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sdk.rpc.account.create("passphrase").then(function (account) {
  console.log(account); // cccqzn9jjm3j6qg69smd7cn0eup4w7z2yu9myd6c4d7
}).catch(console.error);

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var secret = "ede1d4ccb4ec9a8bbbae9a13db3f4a7b56ea04189be86ac3a6a439d9a0a1addd";
var passphrase = "satoshi";
sdk.rpc.account.importRaw(secret, passphrase).then(function (account) {
  console.log(account); // cccqzn9jjm3j6qg69smd7cn0eup4w7z2yu9myd6c4d7
}).catch(console.error);