diff --git a/src/transfer.js b/src/transfer.js
index b0ba572..8b13789 100644
--- a/src/transfer.js
+++ b/src/transfer.js
@@ -1,83 +1 @@
-const fs = require('fs');
-const path = require('path');
 
-const Accounts = require('web3-eth-accounts');
-const Eth = require('web3-eth');
-const Web3 = require('web3');
-const BN = Web3.utils.BN;
-
-const pretty = require('./pretty');
-const erc20Abi = require('./ERC20.abi.json');
-
-const web3Provider = () => {
-  return Eth.giveProvider || 'https://mainnet-rpc.thundercore.com';
-  //return Eth.giveProvider || 'http://localhost:9545';
-}
-
-const signTx = async (fromAccount, tx) => {
-  const signedTx = await fromAccount.signTransaction(tx)
-  return signedTx.rawTransaction // hex string
-}
-
-class ChainHelper {
-  constructor(eth, chainId, fromAccount) {
-    this.eth = eth;
-    this.chainId = chainId;
-    this.fromAccount = fromAccount;
-    this.fromAddress = fromAccount.address;
-  }
-  async submitTx(toAddress, value, txData) {
-    const eth = this.eth;
-    const promiseResults = await Promise.all([
-      eth.getTransactionCount(this.fromAccount.address),
-      eth.getGasPrice(),
-    ]);
-    const nonce = promiseResults[0];
-    const gasPrice = promiseResults[1];
-    const fromAddress = this.fromAddress;
-    const tx = {
-      'gasLimit': 0,
-      'chainId': this.chainId,
-      'gasPrice': gasPrice,
-      'nonce': nonce,
-      'from': fromAddress,
-      'to': toAddress,
-      'value': value,
-      'data': txData,
-    }
-    const gasMultiple = new BN(1.0);
-    tx.gasLimit = '0x' + (new BN(await eth.estimateGas(tx))).mul(gasMultiple).toString(16);
-    console.log('tx:', pretty.format(tx));
-    const rawTxStr = await signTx(this.fromAccount, tx);
-    return eth.sendSignedTransaction(rawTxStr);
-  }
-  async transferToken (contractAddress, toAddress, value) {
-    const eth = this.eth;
-    const contractAbi = erc20Abi;
-    const contract = new eth.Contract(contractAbi, contractAddress);
-    const txData = contract.methods.transfer(toAddress, value).encodeABI();
-    return this.submitTx(contractAddress, 0, txData);
-  }
-}
-
-const create = async (privateKey) => {
-  const accounts = new Accounts();
-  if (!privateKey.startsWith('0x')) {
-    privateKey = '0x' + privateKey;
-  }
-  const account = accounts.privateKeyToAccount(privateKey);
-  const eth = new Eth(web3Provider());
-  const networkId = await eth.net.getId();
-  return new ChainHelper(eth, networkId, account);
-}
-
-const readKeys = () => {
-  const privateKeys = fs.readFileSync(path.join(__dirname, '..', '.private-keys'),
-  {encoding: 'ascii'}).split('\n').filter(x => x.length > 0);
-  return privateKeys;
-}
-
-module.exports = {
-  create: create,
-  readKeys: readKeys,
-};