add locally signed transaction script

examples/7nodes/send-signed-tx.js

@@ -0,0 +1,51 @@
+const argv = require('minimist')(process.argv.slice(2));
+const EthereumTx = require('ethereumjs-tx');
+const keythereum = require("keythereum");
+const Web3 = require('web3');
+const fs = require('fs');
+
+
+// connect to block chain
+console.log('using node', argv.node);
+const providerURL = "http://127.0.0.1";
+const providerPort = "2200".concat(argv.node - 1);
+var web3 = new Web3(new Web3.providers.HttpProvider(providerURL + ":" + providerPort));
+
+const keyJSON = fs.readFileSync('keys/key'+argv.node, 'utf8');
+const keyObj = JSON.parse(keyJSON);
+const password = '';
+const privateKey = keythereum.recover(password, keyObj);
+
+console.log('privateKey: ', privateKey.toString('hex'));
+
+
+web3.eth.getAccounts().then(re => {
+  let account = re[0];
+  console.log('account: ', account);
+
+  return web3.eth.getTransactionCount(account);
+}).then(nonce => {
+  console.log('nonce: ', nonce);
+
+  let txParams = {
+    nonce: '0x0'+nonce,
+    gasPrice: '0x00',
+    gasLimit: '0x47b760',
+    to: '0xca843569e3427144cead5e4d5999a3d0ccf92b8e', // node 2 account
+    value: '0x01',
+    chainId: 10,
+  };
+
+  console.log('tx payload: ', txParams);
+
+  const tx = new EthereumTx(txParams);
+
+  tx.sign(privateKey);
+  const serializedTx = tx.serialize();
+  var rawTx = '0x' + tx.serialize().toString('hex');
+
+  console.log('raw transaction: ', rawTx);
+
+  web3.eth.sendSignedTransaction(rawTx)
+    .on('receipt', console.log);
+});