Mining, cryptocurrencies, Ethereum blockchain, crypto trading platforms (here's how to build one, by the way) - this whole relatively new blockchain thing caught my eye a few years ago and the interest only kept increasing.

  • Generate Ethereum Wallet from Private Key. Many times users have Private Key and they want to generate Ethereum compatible password protected wallet from that key. Here is a small utility program for Ethereum Blockchain in NodeJS that would help user to generate Ethereum compatible password protected wallet starting just with Private Key.
  • So I was starting to try and learn more about cybersecurity and how private keys work, because I find them fascinating. I found a website that generated random private keys, and generated a couple to see what would happen. I know by logic, there is a 1/(2^256) chance of getting a real private key. Well, it happened, and now I don't know what to do.

Consider an Ethereum address as your username and a corresponding private key as the password. While your Ethereum address is public and can be shared, the private key must always be kept secret. Using this combination lets you interact with the Ethereum blockchain. An Ethereum address is your identity on the blockchain, and it looks like this.

I'm saying 'relatively new' because even though the actual concept was devised in 1991, the first practical implementation was effected in 2008 by the elusive Satoshi Nakamoto.

With this brief history behind us, we will focus on the second publicly available blockchain, Ethereum (a more flexible and robust implementation of the concept).

It’s going to be a 4-part series covering the workshops I'm running for my local developers community at FullStack Cluj within the following weeks:

  1. Build Your Own Private Ethereum Blockchain with Geth
  2. Build Your Own Private Ethereum Blockchain with Parity
  3. Setup Proof of Authority Consensus on Private Ethereum Blockchains
  4. Automate Blockchain Creation with Puppeth.

So let’s get this going.

First off, we need to install Geth which is one of the 3 original implementations (Go, C++ and Pyhton) of the Ethereum protocol.

To install geth on Mac OS X, we assume you already have Homebrew on your machine. In case you don't, follow this link.

Installing geth on Ubuntu is as straightforward as installing any other package.

And for Windows, you can follow this link.

We will now create 2 accounts, one that we'll seed at genesis and another one we'll use for the miner.

To do so, we will run the following command twice and it will ask for a passphrase on each run.

Under no circumstance should you forget the passphrase you're going to set.

This will generate a pair of password-protected public/private keys inside the <data-dir>/keystore folder. By default, Ethereum will store everything inside the <data-dir> folder except for the PoW Ethash DAG.

If datadir parameter is not provided, the default paths for <data-dir> will be used.

  • Mac: ~/.ethereum
  • Linux: ~/.ethereum
  • Windows: %APPDATA%Ethereum

From this point on, consider the following addresses as the ones generated above.

  • seed 0x6d5da05a98f04de068418051512f3e965ee8dfca
  • miner 0x632d167d2eef0f7c1fa37fcc4777d26fe6df944b

The genesis block is what differentiates between all the Ethereum blockchains. Being the first block in the blockchain and having no reference to a previous one, this block is unique in its own way.

Inside the <data-dir> folder we will create a file called genesis.json with the following content:

config

  • chainId - this is your chain identifier, it can be any number at random and it will be used in replay protection.
  • homesteadBlock, eip155Block, eip158Block, byzantiumBlock - these represent the versions of the blockchain. Since we will start from scratch, all the changes in these versions will be available starting with block 0.

difficulty

This property dictates how hard is to mine a block by directly influencing the nonce applied in the discovery process.

gasLimit

This represents the maximum ammount of gas used on each block. Due to the low mining difficulty we set for the genesis block above, we still want the gas limit pretty high so we don't hit it. This way, we avoid slowing the network.

aloc

In this section we prealocate Ether to the specified accounts. Heads up: this will not create the addresses, you should already have them.

So far, we installed all the prerequisites and configured the node, now the real fun begins.

1. Instantiate The Data Directory

If everything went ok you should have an output similar to this:

2. Start The Node

The networkId we set in the genesis block helps ensuring your network privacy. If other peers want to join your network, they will have to use the same networkId.

The output should be similar to this:

Since we created the accounts with geth inside the same <data-dir> folder and we allocated some Ether in the genesis block to one of the addreses, it was already set as the main account for this instance of the node.

Thus, we can do something like this:

3. Start Another Peer

On the same machine we will start another peer for the miner and for this step we'll create a new <data-dir> (let's call it <peer-data-dir>), copy the miner private key generated above inside the keystore folder, and then start a new peer.

We will then initialize the data dir.

Then start the second peer.

The output should be similar to the one we had above, the difference being the default address which should be the miner one.

4. Connect Peers Together

To connect the peers together we require the enode address of the first peer. To get this, in the console of the initial peer we run:

This should return something like:

With this information we run in the console of the second peer:

5. Start The Miner

Checking the initial balance of the miner account should return 0 as we did not prealocate any funds to this account.

Next, we set the miner address as the payout address for the miner.

And then we start the miner.

After generating the DAG, the miner should start pushing blocks.

And the initial peer should start importing.

Once we stop the miner and check the balance again, we see that after 20 blocks mined the account has 60 Ether.

Having gotten this far, you should now have a basic understanding of how to set up you private Ethereum blockchain.

As mentioned in the introduction, you're currently reading the first article in a series so if you want to build your blockchain further, make sure you check the next one (by following Around25 on Twitter, LinkedIn, or Facebook). There, we’ll dig in a different implementation of the Ethereum protocol by parity.

Oh, and one more thing: want to challenge the ideas above, ask any questions or just learn more about how we do blockchain? Check this page or request our expertise here.

← Guides/ Web3 SDKs / How to generate a new Ethereum address in JavaScript

Overview

When it comes to programming, there’s hardly anyone who has not used or heard about JavaScript. JavaScript was initially created for client-side scripting but has become a full-featured Object-Oriented and procedural language widely used for client and server applications today. JavaScript’s syntax borrows from Java and C++, and it is based on the ECMAScript specification. With over 1,444,231 libraries and counting, JavaScript today is practically used everywhere, including making dApps (Decentralized Applications) on Ethereum. In this guide, we will cover creating an Ethereum address in JavaScript using ethers.js.
Prerequisites
  • NodeJS installed on your system.
  • A text editor
  • Terminal aka Command Line

What is an Ethereum address?

While signing in to any platform on the internet, you need to authenticate using a combination of credentials. Consider an Ethereum address as your username and a corresponding private key as the password. While your Ethereum address is public and can be shared, the private key must always be kept secret. Using this combination lets you interact with the Ethereum blockchain. An Ethereum address is your identity on the blockchain, and it looks like this “0x6E0d01A76C3Cf4288372a29124A26D4353EE51BE”. Having a valid Ethereum address is required for:
  • Receiving/Sending Ethereum currency
  • Signing/Sending transactions
  • Connecting to decentralized applications

How an Ethereum address is generated:

  • A random private key of 64 (hex) characters (256 bits / 32 bytes) is generated first.
    For example:
Generate Ethereum Private Key Javascript

  • A 128 (hex) character (64 bytes) public key is then derived from the generated private key using Elliptic Curve Digital Signature Algorithm (ECDSA).
    For example:

  • The Keccak-256 hash function is then applied to (128 characters / 64 bytes) the public key to obtain a 64 character (32 bytes) hash string. The last 40 characters / 20 bytes of this string prefixed with 0x become the final Ethereum address.
    For example:

Note: 0x in coding indicates that the number/string is written in hex.

Generate Ethereum Private Key

What is ethers.js?

ethers.js is a lightweight alternative to Web3.js, which is the most commonly used Ethereum library today. Ethers.js is considered by some to be more stable and less buggy than other libraries and has extensive documentation. This library is also very friendly to beginners. Ethers.js is very well maintained and is preferred over Web3.js by many new developers.
You can learn more about ethers.js and How to connect to Ethereum network with ethers.js here.

Generating an Ethereum address in JavaScript

Our first step here will be to check if node.js is installed on the system. To do so, copy-paste the following in your terminal/cmd:
If not installed, you can download the LTS version of NodeJS from the official website.
Generate Ethereum Private Key Javascript
If node.js is properly installed, let’s add the ethers.js library using npm (Node Package Manager, a part of node.js).
Generate ethereum private key
The most common issue at this step is an internal failure with `node-gyp.` You can follow node-gyp installation instructions here.
Note: You will need to have your python version match one of the compatible versions listed in the instructions above if you encounter the node-gyp issue.

Generate Ethereum Private Key Javascript Free


Another common issue is a stale cache; clear your npm cache by entering the following command:

Generate Ethereum Private Key Javascript Online

If ethers.js is successfully installed, let’s proceed with creating an Ethereum address.
Create a file named address.js, which will be a short script to create a random private key and an Ethereum address from that key, copy-paste the following in your address.js file:

Line 1-2: Importing ethers library and crypto module that comes with node.js
Line 4: Generating a random 32 bytes hexadecimal string using the crypto object and storing it in the id variable.
Line 4: Adding ‘0x’ prefix to the string in id and storing the new string in a variable called privateKey.
Line 6: Printing our private key with a warning.
Line 8: Creating a new wallet using the privateKey and storing it in the wallet variable.
Line 9: Printing the address of the newly created wallet with a message “Address:”
Save and run your script to generate a new Ethereum address.
If your code executes successfully, the output will look similar to the screenshot below. The first line consists of the private key, and the second line consists of your new Ethereum address.

Conclusion

Your Ethereum address is your identity on the Ethereum network. It is required to interact with the network and perform transactions. To continue learning ethers.js, check out this guide on How to send an Ethereum transaction using ethers.js. Get more information on ethers.js from their official documentation. As you saw, generating a new Ethereum address is quickly done with JavaScript and the latest libraries. The development of dApps on the Ethereum blockchain is supported by a variety of tools that are continuously updated and improved by the fast-growing Ethereum community. Look out for more easy-to-follow guides from QuikNode - your provider of affordable and lightning-fast Ethereum nodes. Learn how to get started with QuikNode and spin up your own Ethereum node in minutes.
Subscribe to our newsletter for more articles and guides on Ethereum. If you have any feedback, feel free to reach out to us via Twitter. You can always chat with us on our Discord community server, featuring some of the coolest developers you’ll ever meet :)
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  • Overview
  • What is an Ethereum address?
  • How an Ethereum address is generated:
  • What is ethers.js?
  • Generating an Ethereum address in JavaScript
  • Conclusion

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