Ensure private key starts with `0x`

bot/index.js

@@ -91,6 +91,9 @@ async function sendTransaction (to, amount, gasPrice) {
   if (isNaN(amount)) {
     throw Error('Invalid amount')
   }
+  if (!config.privateKey.startsWith('0x')) {
+    throw Error('Private key should start with 0x')
+  }
 
   let transaction = null
   let hash = null

config/default.js

@@ -53,10 +53,10 @@ module.exports = {
   // URL for the signer
   signerPath: 'https://ropsten.infura.io',
 
-  // Address with the funding for the bounties
+  // Address with the funding for the bounties (hex value starting with 0x)
   sourceAddress: '0x26a4D114B98C4b0B0118426F10fCc1112AA2864d',
 
-  // Private key for ether.js wallet
+  // Private key for ether.js wallet (hex value starting with 0x)
   privateKey: '',
 
   // Token of the currency for fetching real time prices (e.g. 'SNT')